EP2238046B1 - Beaker made of paper material and method and device for the production thereof - Google Patents

Description

The invention relates to a cup made of a paper material with a fillable interior, which is formed by a conical jacket and a bottom, wherein the bottom is fixed at the lower end of the interior with a frame substantially liquid-tight manner on the jacket, wherein on the inner space bounding shell a shoulder is arranged for holding a similar cup in stacking a plurality of cups.

The invention further relates to a method for producing a cup of a paper material, which consists of a conical jacket and a liquid-tightly secured in the region of the smaller circumference of the shell by a frame bottom, wherein a shoulder is formed in the jacket, which is used to hold a similar Bechers serves in stacking several cups.

The invention further relates to an apparatus for producing a cup from a paper material having a mandrel for a conical shell and a bottom of the cup, the mandrel having a shoulder for forming a shoulder in the shell.

The term "shoulder" should be understood so that the shoulder forms a sudden change in size of the shell. Seen from the bottom of the cup to a filling opening, the shoulder presents itself as an abrupt cross-sectional enlargement. The shoulder can also be referred to as a "bead". The shoulder or bead is a means for holding another cup of the same kind. For transportation, a plurality of similar cups are stacked in one another. Thus, the cups do not wedged into each other and also can be unstacked well, the shoulder is provided as a means for stacking in the jacket.

A cup, a method and a device of the type mentioned is by the DE 10 2004 056 932 A1 State of the art. The well-known cup has a shoulder that gives the cup quite good stacking properties. In the production of the known cup, a prefabricated cup is used as a semi-finished product, in which the bottom is already attached to the frame liquid-tight manner on the jacket. The shoulder is shaped by an axial displacement of a mold towards the larger circumference of the conical jacket. The inner diameter of the mold is larger than the outer diameter of the bottom and the frame, so that the mold can be pushed over from below over the frame, without damaging the frame and affecting the tightness. This inevitably results in that the radius of the shell below the shoulder is greater than at the level of the ground. The size of the sudden change in size of the jacket at the shoulder is limited.

From the British patent GB 1 261 531 For example, a double-walled plastic cup is known which is made by vacuum-forming heated plastic sheet material. The inner cup of this double-walled cup may have a reentrant shoulder which may serve to unstack a second cup. In the stacked state, the bottom of the upper cup rests on the circumferential shoulder of the lower cup.

From the Korean patent application KR 2002-0005420 A a paper cup is known, which is executed single-walled and which is stackable. In order to enable the stackability of the described cup, a bottom frame of the cup is turned inwards and in addition at its lower edge down, away from the interior of the cup, bent. A lower edge of the cup is thereby radially clearly within the outer periphery of the bottom. However, the bent bottom frame ensures a gap between the bottoms of two stacked cups and can thereby prevent jamming of the respective conical Becherwandungen when stacking.

From the Japanese patent application JP 2003/340943 For example, a method and apparatus for forming a bottom tray of a paper cup is described.

From the French patent FR 1 181 342 is a single-walled paper cup is known in which the cup jacket is expanded at the level of the bottom radially outward. By this expansion at the level of the cup bottom, a stack stop for the lower edge of a bottom frame of a stacked cup is created. A distance between the bottoms of two stacked cups is so large that jamming of the conical cup walls of the stacked cups is avoided.

From the Japanese patent application JP 2005/153899 is a single-walled paper cup and an apparatus and method for molding a bottom frame of such a single-walled paper cup known.

From the Japanese patent application JP 2003/128038 a paper cup is known, the bottom frame is widened at its lower edge in the radial direction. In this case, the bottom frame has a course following the cone angle of the inner cup in its region adjoining directly to the bottom of the cup, and is expanded radially outward only in a region spaced from the bottom. The expansion serves to secure an insulating sleeve of the cup, which is pushed onto the inner cup against slipping off.

The invention is based on the object to further improve the stacking properties of a cup of the type mentioned.

The object is achieved by a cup having the features of claim 1. The radius of the shell is - seen to the central axis of the cup - below the shoulder highest as large as the radius of the ground. Preferably, the radius of the shell below the shoulder is even smaller than at the level of the ground.

In the method, the object is solved by the features of claim 5. To form the shoulder, an area of the shell is deformed to a radius - seen to the central axis of the cup - which is smaller than the radius of the shell on the finished cup at the level of the bottom. Preferably, the shoulder is formed before the floor is substantially liquid tightly connected to the shell. In the device, the object is solved by the features of claim 13. At the shoulder of the mandrel adjoins an area in which the radius of the mandrel - seen to the central axis of the mandrel - smaller than the outer radius of the cup bottom is.

The stacking properties of such a cup are improved because the sudden change in size of the shell at the shoulder is increased. The stability and power-absorbing capacity of the shoulder is increased, so that even a large number of stacked cups can not be wedged together and easily unstacked again.

It does not matter which shape the shell of the cup has in cross section. The jacket is preferably circular in cross-section, but may alternatively be, for example, oval or rectangular with rounded corners. The cup has a roughly truncated cone-like shape in the case of a round cross-section, while in the case of a rectangular cross-section of the shell it has a rather truncated pyramidal shape. The radius of the shell is defined at a non-circular cross-section of the shell as the distance of a region of the shell to the central axis of the cup. For a circular cross-section of the shell, the radius is defined as half the diameter.

The term "paper material" from which the bottom and the jacket are made can be understood as meaning different materials which have at least one layer of paper, cardboard or cardboard. In addition, the material may comprise one or more layers of plastic and / or aluminum. It can also be provided that the paper material is waxed or painted in order to have a resistance to the liquid to be filled into the interior. Preferably, the paper material is at least on the side bounding the interior with a thin plastic layer, preferably made of polyethylene, coated. In contrast to pure Kunststöffmaterial the formability and in particular the extensibility of such paper material is limited. Too much deformation, the paper material itself or even a proposed coating tear, so that the tightness is impaired.

For cups made of paper material, therefore, the frame is an essential design feature that can not be dispensed with. The frame is necessary for the connection between the jacket and the floor. At the frame are at least two layers of material in the thickness direction to each other, namely the material of the bottom and the material of the inner space bounding shell. Preferably, the bottom is designed pot-shaped, the open side of the filling opening of the cup is remote. The at least two material layers are thus preferably arranged along the wall of the cup-shaped bottom. It can additionally be provided that, for example, the jacket is wrapped around the material of the floor, and that the frame consists of three or more layers of material. The material of the bottom is glued or sealed to the material of the jacket in the region of the frame in order to be liquid-tight at least for a certain period of time.

It is advantageous that in the manufacture of the cup, the shoulder is formed before the bottom is substantially liquid-tightly connected to the shell. Preferably, when forming the shoulder, the bottom is already inside the shell shaped sleeve, but is not yet connected to the mantle. The radius of the bottom can thereby be reduced by forming the shoulder in the elastic region by compression. Thereby, the advantage is achieved that the frame does not hinder the deformation of the shoulder, and thereby can produce a shoulder with a larger jumpy size change. The tightness of the frame can not be adversely affected by the shaping of the shoulder, since the bottom is connected to the shell substantially liquid-tight only in a shoulder forming the shoulder downstream process step. Surprisingly, the compression of the soil does not affect the subsequent production of the frame at all.

In an advantageous embodiment of the invention, the shoulder is formed by an axial displacement of a mold towards the larger circumference of the conical jacket out. The mold is pushed from below, ie from the region of the smaller circumference of the conical jacket, over the jacket. The material of the jacket is compressed. The compression causes a material compaction in the area of the shoulder which increases the stability of the shoulder. Preferably, a height range of the accommodating mandrel disposed within the conical shell has a constant radius, which supports the shell from the inside when shaping the shoulder. The mantle is deformed to a constant radius when shaping the shoulder in a height range. It can thereby be achieved preferably below the shoulder, a height range of the shell, in which the jacket extends substantially parallel to the central axis of the cup. The forces acting parallel to the central axis when stacking several cups can be very well absorbed and discharged from the shoulder.

In particular, when the radius of the shell below the shoulder is smaller than at the level of the bottom, the jacket does not extend exactly parallel to the central axis in an area below the shoulder. Depending on the size difference of the radii and the properties of the paper material used, in particular the stiffness, different angles of the jacket will result in a height range below the shoulder. The radius of the shell below the shoulder is preferably 0.05 mm to 0.5 mm, in particular about 0.1 mm to 0.3 mm, smaller than the radius of the shell at the level of the bottom. This makes it possible to achieve a very stable shoulder, in which no cracks occur in the paper material. Below the shoulder, a height range of the shell is then present, in which the angle of the jacket is negative, that is less than zero. It is assumed that a definition of the angle of the shell to the central axis of the cup, in which a positive cone angle is present when the circumference of the shell decreases from the filling opening in the direction of the ground. A parallel to the central axis extending The area of the shell has a cone angle of 0 °, and an area of the area of the cup that widens toward the bottom has a negative cone angle.

The shoulder can also be defined with this definition of the cone angle such that below the shoulder there is a height region of the shell in which the angle of the shell to the central axis is substantially smaller than the angle of the conical shell above the shoulder. This condition is also met by negative cone angles, even though they should be greater in magnitude than the cone angle above the shoulder. Preferably, the angle of the jacket below the shoulder is less than half of the angle above the shoulder. As a result, a shoulder can be achieved with a significant jump in size, which has good stacking properties. In an embodiment of the invention, it is advantageous that the height range of the jacket below the shoulder, in which the angle of the jacket deviates from the cone angle above the shoulder, extends from the shoulder to the bottom. Preferably, the distance from the shoulder to the ground is less than 10 mm. The forces occurring during stacking can be absorbed very well by the frame.

To further improve the stability of the jacket in the region below the shoulder can be provided that below the shoulder, a height range of the shell is present, are arranged in the parallel to the central axis extending ribs. The ribs can be molded into the mantle as the shoulder forms. For this purpose, it is advantageous that the molding tool has recesses extending parallel to the central axis for shaping the shoulder. Since the material is compressed below the shoulder, the recesses in the mold can accommodate a portion of the excess material so that uncontrolled wrinkling of the shape of the shoulder does not occur.

In order to achieve a stable shoulder, it is advantageous that the radius of the sheath below the shoulder is more than 0.5 mm, in particular even more than 1 mm, smaller than the radius of the sheath above the shoulder. The radius of the receiving mandrel preferably changes at the shoulder shaping shoulder by more than 0.5 mm, in particular by more than 1 mm. Preferably, the radius of the mandrel on the shoulder changes by about 1 mm to 1.5 mm. It is advantageous that the shoulder has an angle to the central axis of the mandrel of 40 ° to 70 °, in particular from 50 ° to 60 °, to form a shoulder with a high stability.

In a further embodiment of the invention, it is advantageous in a single method step, together with the shaping of the shoulder, to roll up the jacket around a region of the bottom.

For this purpose, the shaping tool for the shoulder has a means for shaping the curl of the jacket surrounding the bottom. When the mold is pushed axially onto the casing, the lower edge of the casing is thus rolled inwards and laid around the wall of the soil at the same time as the shaping of the shoulder. The preparation of the cup according to the invention is thereby considerably facilitated. The molding tool is preferably designed as a ring.

The stacking of a similar cup on the shoulder can be done in different ways. It is advantageous that a lower edge of the frame, which forms the base for the cup, is supported during stacking on the shoulder of a similar cup. It is particularly advantageously provided that the casing and / or the bottom in the region of the frame and / or the frame itself at least in an area along the circumference has an outwardly projecting expansion, and that a lower edge of the expansion forms a base for the cup , Preferably, the outer radius of the expansion is greater than the outer radius of the shell at the level of the ground. The base of the cup is enlarged by the expansion, so that the cup has improved stability. The stacking properties of the cup are also improved because the frame is a very stable element of the cup and is very well suited to absorb the forces occurring during stacking. The expansion is formed in a preferred embodiment continuously and uniformly along the circumference. The preparation of the cup is greatly simplified if, during the formation of the frame, the jacket and / or the bottom in the region of the frame and / or the frame itself is widened outwardly at least in a region along the circumference, so that a lower edge of the expansion forms a base for the cup. For the preparation of the expansion then no additional process steps are necessary. The expansion, like the shoulder, is a means of holding another cup of the same type. The dimensions of the shoulder and the expansion are adapted to each other to ensure optimal stacking.

In an embodiment of the invention can be provided that the cup has a heat-insulating outer jacket. The design of the heat-insulating outer shell is arbitrary per se. The outer sheath can be made for example of a plastic, paper or composite material. To improve the insulation effect, the outer sheath can also be corrugated, corrugated, embossed or provided with a foamed layer. For example, a corrugated intermediate layer may be provided, which is covered by a smooth overlying outer layer.

Depending on the configuration of the outer jacket, it may be advantageous for a means for holding another cup of the same type to be attached to the outer jacket, which is supported on the shoulder during stacking. This embodiment has the advantage that on the inner cup no second means for stacking needs to be provided. On the expansion of the frame can be omitted in this case.

It is particularly advantageous, however, if the cup can be safely and stably stacked even without the presence of an outer sheath. An optionally provided outer sheath can be made largely independent and free. The outer sheath is not stressed by the forces occurring during stacking, so that no special stability requirements are placed on the outer sheath. One and the same inner cup can be combined in a simple and almost arbitrary manner with a variety of outer shells. Without changing the shape and dimensions of the inner cup or the components forming the interior of the filling, different cups with different visual and haptic appearance can be created, since the appearance that the user of the cup perceives, mainly determined by the design of the outer shell. This design freedom can be assisted by the fact that the outer contour of the outer shell is in a parallel to the inner space bounding shell, which is applied to the expansion of the frame. It is advantageous for a simple production that - after forming a widened frame - a sleeve-shaped preformed outer jacket is pushed in the axial direction on the inner space bounding conical jacket of the inner cup. For the production of the outer jacket, this is first of a blank, which has the shape of a segment of a circular ring, wound on a mandrel and connected to a frusto-conical sleeve. In the region of the smaller circumference of the outer jacket, an inward curvature is formed. The inwardly directed curl has an area running substantially parallel to the outer jacket. The curl at the bottom of the outer shell can be pressed flat. In addition, the lower edge may be slightly retracted, so that at the lower end of the outer shell, a greater conicity is present. The inward curl at the lower end of the outer shell serves to support the outer shell on the inner cup. Preferably, the curl is supported below the bottom of the frame. In order to ensure a good installation of the curl on the inner cup, it is advantageous that the outer shell in the region of the curl has an inner radius which is smaller than the outer radius of the frame at the lower edge of the expansion.

Further advantages and features of the invention will become apparent from the claims and the following description of some embodiments in conjunction with the figures. Individual features of the different embodiments shown and described can be combined in any way, without exceeding the scope of the invention.

• Figur 1 einen erfindungsgemäßen Becher im Längsschnitt,
• Figur 2 eine Ansicht ähnlich Figur 1 auf zwei gestapelte Becher,
• Figur 3A bis Figur 3D unterschiedliche Ausgestaltungsformen des Bereichs III des Bechers der Figur 1 in vergrößerter Darstellung,
• Figuren 4 und 5 Ansichten ähnlich Figur 1 auf teilweise dargestellte Becher unterschiedlicher Ausgestaltung, bei denen verschiedene Außenmäntel vorgesehen sind,
• Figur 5A eine vergrößerte Ansicht eines Teilbereichs einer Abwandlung des Bechers nach Figur 5,
• Figur 6 einen teilweise dargestellten Längsschnitt einer Vorrichtung zum Herstellen einer Schulter an dem Mantel des Bechers der Figur 1,
• Figuren 7A und 7B Ansichten in Richtung des Pfeiles VII der Figur 6 auf Aufnahmedorne unterschiedlicher Ausgestaltung,
• Figur 8 eine Ansicht in Richtung des Pfeiles VIII der Figur 6 eines Formwerkzeuges zum Formen einer Schulter,
• Figur 9 eine Ansicht einer Variante der Figur 6,
• Figur 10 einen teilweise dargestellten Längsschnitt einer Vorrichtung zum Verpressen der Zarge,
• Figuren 11 und 12 einen teilweise dargestellten Außenmantel des Bechers der Figur 5 im Längsschritt bei unterschiedlichen Herstellungsschritten.

Show it:

• FIG. 1 a cup according to the invention in longitudinal section,
• FIG. 2 a view similar FIG. 1 on two stacked cups,
• Figure 3A to Figure 3D different embodiments of the area III of the cup of FIG. 1 in an enlarged view,
• FIGS. 4 and 5 Similar views FIG. 1 partly illustrated cups of different design, in which different outer shells are provided,
• FIG. 5A an enlarged view of a portion of a modification of the cup after FIG. 5 .
• FIG. 6 a partially illustrated longitudinal section of an apparatus for producing a shoulder on the jacket of the cup of FIG. 1 .
• FIGS. 7A and 7B Views in the direction of arrow VII of FIG. 6 on mandrels of different design,
• FIG. 8 a view in the direction of the arrow VIII of FIG. 6 a mold for shaping a shoulder,
• FIG. 9 a view of a variant of FIG. 6 .
• FIG. 10 a partially illustrated longitudinal section of a device for pressing the frame,
• FIGS. 11 and 12 a partially illustrated outer shell of the cup of FIG. 5 in the longitudinal step at different production steps.

The in FIG. 1 Cup 1 shown essentially consists of a conical shell 2 and a cup-shaped bottom 3. The open side of the cup-shaped bottom 3 is arranged so that it faces away from the filling opening of the cup 1. The bottom 3 is connected with its wall 4 in the region of the smaller circumference of the shell 2 liquid-tight with this to form a frame 5. In the region of the frame 5, the material of the jacket 2 is wrapped around the wall 4 of the bottom 3 and hammered inwards. The shell 2 and the bottom 3 form a fillable interior 6 of the cup 1. The shell 2 has at its upper edge, ie in the region of the larger circumference, an outwardly beaded mouth roll 7, which surrounds the filling opening.

The property "conical" of the shell 2 is understood to mean that the shell 2 in the in FIG. 1 shown longitudinal section of the mouth roll 7 to the bottom 3 at least partially tapers, so at least partially reduced its radius to the central axis 8. In the lower region of the fillable interior 6, preferably in the lower third, the jacket 2 has a shoulder or bead 9. The jacket 2 has an angle A to the central axis 8. The jacket 2 may have different angles of inclination A in different areas. Over a large area of the interior 6, the angle A is constant. The angle A is defined so that the angle A of the shell 2 between the mouth roll 7 and the shoulder 9 in FIG. 1 has a positive value. An inclination angle A of 0 ° corresponds to a parallel to the central axis 8 extending jacket 2. If the jacket 2 expands towards the base of the cup on, as is the case in the frame 5, the inclination angle A is negative.

The frame 5 has at least in an area along its circumference an outwardly projecting widening 10. A lower edge 11 of the expansion 10 on the frame 5 forms the base for the cup 1. The footprint is increased by the expansion 10, so that a tipping over of the cup is difficult.

The shoulder 9 is formed by a virtually sudden change in size of the shell 2. The radius B of the shell 2 below the shoulder 9 - seen to the central axis 8 - is about 1 mm to 1.5 mm smaller than the radius C of the shell 2 above the shoulder 9. The cup 1 preferably has a circular cross-section. In this case, the radius of the shell corresponds to half the diameter. In the region of the shoulder 9, the jacket 2 has a very large angle of inclination A, which is about 40 ° to 70 °, and preferably 50 ° to 60 °. The shoulder 9 serves to hold a similar cup 1 'when stacking a plurality of cups 1 and 1', such as this in FIG. 2 is shown. The cup 1 ', which is stacked in the cup 1, is supported by its frame 5' on the shoulder 9 of the cup 1. The radius D of the expansion 10 is adapted to the radius C above the shoulder 9. This ensures that the cup 1 'stably and securely rests on the shoulder 9, but without jamming in the conical jacket 2. The forces that occur when stacking along the central axis 8, for example, the weight forces of the cup 1 'and possibly even stacked cups are safely absorbed by the shoulder 9 and the jacket 2 to the lower edge 11 of the frame 5 of the lower cup. 1 forwarded and released from there to the underground. By the inventive design of the shoulder 9 and very high forces in the direction of the central axis 8 can be added and it is easy removability of the cup 1 or 1 'guaranteed during unstacking.

In a cup 1 according to the invention, the shoulder 9 is designed so that the radius B of the shell 2 below the shoulder is at most equal to the radius E of the shell 2 at the level of the bottom 3. Of course, in each case also the outside of the casing 2 measured radius B 'and E' could be compared. Below the shoulder 9, a height range F of the jacket 2 is present, in which the angle A of the jacket 2 deviates from the angle A of the conical jacket above the shoulder 9. The height range F extends from the shoulder 9 to the bottom 3. In order to achieve a good stability of the height range F, it has proven to be advantageous not to make the height range F greater than 10 mm.

In the height range F, the jacket 2 extends substantially parallel to the central axis 8. This is advantageous in order to achieve a good transfer of the forces occurring during stacking from the shoulder 9 to the frame 5. In the FIGS. 3A to 3D are different advantageous variants of the design of the height range F below the shoulder 9 shown enlarged. In FIG. 3A extends the mantle 2 in the height range F exactly parallel to the central axis 8. The radius C of the shell below the shoulder is thus the same size as the radius E of the shell at the level of the bottom 3. In the Figures 3B, 3C and 3D the radius B below the shoulder 9 is smaller than the radius E at the level of the bottom 3. The radius B is preferably about 0.15 mm to 0.2 mm smaller than the radius E. As a result, that the radius B is a few tenths of a millimeter smaller than is the radius E, can be at a constant radius C above the shoulder 9, the width of the shoulder 9 increase. By widening the shoulder 9 can be a significant increase in stability of the shoulder 9 when stacking several cups 1, 1 'reach.

At the in FIG. 3B illustrated embodiment, the height range F is divided into two areas. In the Höhenbreich F 'the mantle 2 extends parallel to the central axis 8. In the height range In height range central axis altitude range, the inclination angle A of the shell 2 is negative, here the coat 2 widens towards the bottom 3.

In the embodiment according to FIG. 3C In the height range F ', the angle A is positive, but substantially smaller than the angle A of the conical jacket 2 above the shoulder 9. The angle A in the height range F' is preferred less than half of the angle A of the conical jacket 2 above the shoulder. 9

In Figure 3D an embodiment is shown in which the jacket 2 has a negative angle over the entire height range F. The jacket 2 thus has a reverse conicity in the height region F in comparison to the jacket above the shoulder 9.

Due to the definition of the cone angle A with positive and negative values is in all embodiments of the FIGS. 3A to 3D the inclination angle A of the jacket 2 in the height range F below the shoulder 9 is substantially smaller than the angle A of the conical jacket 2 above the shoulder 9.

Although it is in the FIGS. 1 to 3 is not shown, it may be advantageous to assign the cup 1 an outer sheath which surrounds the inner space 6 limiting sheath 2 preferably to form a cavity. So that the stacking of the cup 1 is not impaired, it may be advantageous for the outer contour of the outer casing to be located within a parallelism 12 to the casing 2 delimiting the inner space 6, the parallel 12 being applied to the widening 10 of the frame 5. As long as an outer sheath is located within the space between the parallels 12 and the sheath 2 bounding the inner space 6, the stacking properties of the cup are in no way affected. The freedom of design for the outer shell are thus almost no limits. In addition, it is possible to provide a common embodiment of the cup 1 with different outer shells, without having to change the stacking essential shoulder 9 and the expansion 10. Below are with the help of FIGS. 4 and 5 some possible embodiments for such outer shells described.

The in the FIGS. 4 and 5 Each of the cups 1 shown has a heat-insulating outer jacket 13, which partially surrounds the jacket 2 bounding the interior 6 to form a cavity 14. Such cups are also called double-walled Isolierbecher referred to, in which the coat 2 located within the outer shell 13 can also be referred to as "inner cup" in connection with the bottom 3. The inner cup, in particular with the shoulder 9, are each analogous to those in the FIGS. 1 to 3 designed variants, so that can be dispensed with a repeated description.

The outer jacket 13 of in FIG. 4 Cup 1 shown is arranged substantially parallel to the inner space 6 limiting shell 2. The outer shell 13 has at an upper and at a lower end in each case an inwardly directed curl 15 and 16 and is supported by the curls 15 and 16 on which the jacket 2 from. It can be provided that the outer casing 13 is fixed in the region of the curl 15 and / or 16, for example by gluing. The curl 16 is supported in the region of the frame 5 and thus below the horizontal bottom 3 on the inner casing 2, whereby the outer casing 13 is very stable. The inner radius P of the curl 16 is therefore smaller than the radius D of the widening 10. At the same time, the outer casing 13 also covers the shoulder 9 so that it is not recognizable from the outside. The curl 16 has a region 17 extending parallel to the outer casing 13. The region 17 extends close to the inside of the outer shell 13 and can also rest there. The radius G at the upper edge 35 of the parallel to the outer shell 13 extending portion 17 is greater than the radius D of the expansion 10 on the frame 5. Thus, the sliding of the outer shell 13 on the jacket 2 is greatly simplified, since the curl 16 of the outer shell 13 can no longer get caught on the frame 5.

In FIG. 5 has the shell 2 in the area below the mouth roll 7, a second shoulder 18, which is seen from the bottom 3 to the mouth roll 7 as a sudden cross-sectional enlargement. The outer jacket 13 is in the area between the mouth roll 7 and the shoulder 18 with the inner space 6 limiting coat 2, for example, by sealing or gluing, connected. At its lower end, the outer jacket 13 has an inwardly directed curl 16, which also has a region 17 extending parallel to the outer jacket 13. The curl 16 is supported below the bottom 3 on the frame 5 from. The curl 16 is in contrast to FIG. 4 flattened and slightly retracted at the lower edge portion 19 so that there is a greater taper of the outer shell 13 is present. The radius P is smaller than the radius D, while the radius G is greater than the radius D.

An advantageous modification of the cup 1 in the region of the upper shoulder 18 is in FIG. 5A shown greatly enlarged. The area of the shell 2 which lies between the mouth roll 7 and the shoulder 18 has a different angle of inclination than the shell 2 between the shoulder 18 and the shoulder 9 up. In FIG. 5A extends the shell 2 between the mandrel 7 and the shoulder 18 approximately parallel to the central axis 8. Thus, the outer shell 13 can be pushed a little below the mouth roll 7 when pushed onto the inner cup, the upper edge portion 20 of the outer shell 13 is slightly retracted. The edge region 20 thus does not continue the conical outer casing 13 uniformly but has a different angle to the central axis 8. If the outer jacket 13, as in FIG. 5A shown, with its upper edge portion 20 a little inserted into the mouth roll 7, the result is a particularly good appearance of the cup 1, since the upper edge of the outer shell 13 is no longer visible. If the outer sheath 13 is pushed further into the mouth roll 7 in an unillustrated embodiment, the clamping of the outer sheath 13 by the material of the mouth roll 7 causes a fixation of the outer sheath 13. For certain applications, the clamping of the outer sheath 13 in the mouth roll 7 as only attachment of the outer jacket 13 may be sufficient.

In the manufacture of a cup 1 according to FIG. 1 First, a conical jacket 2 and an approximately cup-shaped bottom 3 are formed. As in the presentation of FIG. 6 can be seen, the jacket 2, which later forms the interior 6, initially the shape of a conical sleeve. The bottom 3 has the shape of a truncated cone, which tapers parallel to the sleeve 2. In the in FIG. 6 shown state, the bottom 3 and the jacket 2 are not yet connected to each other, but only inserted into each other. Jacket 2 is attached to a receiving mandrel 21, which has a frustoconical shape in a first height range H, in which the angle of inclination of the peripheral surface corresponds to the angle A of the jacket 2 to the central axis 8. The tapered end of the frusto-conical region H is followed by a shoulder 22 for forming a shoulder 9 in the jacket 2. The paragraph 22 has a greater inclination angle A than the height range H, wherein the angle A of the shoulder 22 is preferably 50 ° to 60 ° and is selected according to the desired inclination angle of the shoulder 9 on the cup 9. The section 22 is adjoined by a region J in which the radius K of the receiving mandrel 21, viewed in relation to the central axis 8 of the receiving mandrel, is smaller than the outer radius E of the cup bottom 3 and preferably remains constant over the height J. The radius of the receiving mandrel 21 changes at the shoulder 22 by more than 1 mm, in particular by 1 mm to 1.5 mm. As a result, it is possible to produce a shoulder 9 drawn in relatively far into the interior 6, in order to ensure safe stacking of several cups, as has already been described above. The radius K is smaller by a few tenths of a millimeter, in particular about 0.15 to 0.2 mm, than the radius E. The size of the radius K compared to the radius C and the radius E and the rigidity of the for the shell second used paper material later determines the appearance of the shoulder 9 and the height range F below the shoulder 9 on the finished cup 1, in particular in FIG. 3 is shown.

To form the shoulder 9 is next to the mandrel 21, a mold 23, the bottom of FIG. 6 is shown and that is movable along the central axis 8 of the mandrel 21. The mold 23 is moved in the direction of arrow L on the mandrel 21. The molding tool 23 has a surface 24 which essentially corresponds in its angle to the central axis 8 to the angle of inclination A of the shoulder 22. The mold also has a surface 25 whose radius M is matched to the radius K of the mandrel 21 and the thickness of the paper material of the shell 2. The radius M can be chosen even smaller than the radius E of the bottom 3. The sleeve 2 is thus clamped between the mandrel 21 and the mold 23, so that between the surface 24 and the shoulder 22, the shoulder 9 is formed. Since the bottom 3 and the shell 2 are not yet connected to each other by sealing or gluing, the shell 2 can be compressed to form the shoulder 9 stronger than would be possible with already connected shell 2 and bottom 3. When pushing the mold 23 in the direction of arrow L, the radius E of the bottom 3, which is already inside the shell 2, is reduced in the elastic region by compression. The bottom 3 reduces its radius E so that the radius K of the mandrel 21. By the axial displacement of the mold 23 in the direction L to the larger circumference of the conical shell 2 occurs in the area between the surface 24 and the shoulder 22 to a compression of the paper material of Mantels 2. It can thereby produce a very stable shoulder 9 on the finished cup 1.

In the FIGS. 7A and 7B are top views of two different variants of the mandrel 21 shown. The in FIG. 7A shown receiving mandrel 21 is used to form a shoulder 9, which rotates along the entire circumference of the shell 2. The paragraph 22 is therefore designed as a peripheral surface of a truncated cone. The shoulder 22 is adjoined by a cylindrical region J, which has the radius K. The cooperating with the shoulder 22 during the molding of the shoulder 9 surface 24 of the mold 23 is also configured in this case as a frustoconical surface. The surface 25 of the mold, which encloses the region J below the shoulder 22, is designed as a cylindrical surface, as in the view of FIG. 8 is recognizable. Such an embodiment of the device for producing the cup 1 with a circumferential shoulder 9 around the entire circumference is simple and allows the production of a very stable shoulder. 9

In FIG. 7B an alternative embodiment of a mandrel 21 'is shown, with the three separate shoulders along the cup circumference can be formed. Such an embodiment may also be advantageous for particular applications, since the stresses of the paper material of the shell 2 in the formation of separate shoulders depending on the used paper material is more advantageous. In the mandrel 21 'are three paragraphs 22' distributed uniformly along the circumference. In the region of each shoulder 22 ', a height range J is present, which has a radius K to the central axis 8 and is used to form one shoulder each. The already to FIG. 6 made statements apply in one embodiment according to FIG. 7B corresponding. The forming mandrel 21 'associated mold is not shown. This in FIG. 6 shown mold 23 is in the area of the surfaces 24 and 25 on the design of paragraphs 22 'of the mandrel 21' adapt.

As already mentioned, the paper material of the shell 2 is compressed when pushing the mold 23 in the region J to a smaller radius. Depending on the paper material and depending on the size change between the radius C and the radius K, it may be advantageous to provide in the mold 23 parallel to the central axis 8 extending recesses 26 for forming ribs 27 which can accommodate material. The recesses 26 are in the FIGS. 6 and 8th dashed to interpreted. The formed by the recesses 26 ribs 27 are on the finished cup 1 in FIG. 1 indicated by dashed lines. The ribs 27 cause an additional stiffening of the height range F below the shoulder 9 and can further improve the stacking properties of the cup 1.

Thus, the jacket 2 can be connected to the bottom 3 under the formation of the frame 5, the lower end 28 of the shell 2 is turned over so that it in FIG. 6 Dashed line 30 shown assumes position. The molding tool 23 has a means 29 for forming a curl 30 surrounding the base 3 of the shell 2. The means 29 for curling the shell 2 is designed as a groove-shaped area, which in the sectional view of the mold 23 in FIG. 6 is shown only in sections, but extends over 360 °. The simultaneous turning over of the lower edge 28 of the shell 2 with the shaping of the shoulder 9 facilitates the production of the cup according to the invention considerably.

The jacket 2 is wound from a segment of a circular ring over a mandrel and then glued or sealed along a longitudinal seam. In order to facilitate the turning over of the lower edge 28 of the jacket 2 by means of the forming tool 23, the longitudinal seam of the jacket 2 in the region of the lower end 28 can not be glued or sealed. This area is in the presentation of the FIG. 6 denoted by N. If the longitudinal seam in the area N is not glued or sealed, the jacket 2 can deform more freely when the lower end 28 is folded over, and corrugation of the paper material, which in principle is difficult to deform, is avoided. The region N may extend from the lower edge 28 of the shell even to the lower edge of the bottom 3, as in the FIG. 6 is indicated by the reference N '. The length of the region N or N 'is thus variable and can be changed according to the requirements.

Subsequent to the forming of the shoulder 9 and the turning over of the lower end 28 of the shell 2, the bottom 3 is connected to the shell 2 to form a frame 5 substantially liquid-tight to finish the inner cup 1 in a subsequent process step. This is done with the help of an outer ring and an inner tool, wherein at the same time when connecting the bottom 3 with the jacket 2, the frame 5 is widened so that the in FIG. 1 shown, to the lower edge 11 towards expanding shape of the frame 5 results. This will still be based on the FIG. 10 explained. In FIG. 9 a further embodiment of the invention is shown, wherein, in contrast to the embodiment of the FIG. 6 the shell 2 'has an initially conical shape, which then merges with the horizontal bottom 3' into a cylindrical shape. Consequently, the bottom 3 'in this embodiment has an inverted cup shape with a cylindrical peripheral wall 4'. However, both the design of the receiving mandrel 21 and the mold 23 are in accordance with the already explanatory shaping FIG. 6 identical. Due to the cylindrical preforming of the peripheral wall 4 'of the bottom 3' and the likewise cylindrical preforming of the lower portion of the shell 2 ', the wrinkling during the folding of the lower edge 28' of the shell 2 'and in the subsequent expansion and forming of the frame 5 is reduced.

With the help of FIG. 10 the process step of forming the frame 5, which is arranged downstream of the shaping of the shoulder 9, is described. Initial state is the in FIG. 9 shown in phantom 30 ', which results after the folding of the lower end 28' of the shell 2 '. In FIG. 10 It can be seen that the angle A of the shoulder 9 substantially corresponds to the angle of inclination of the shoulder 22. Depending on the stiffness and elasticity of the paper material used for the jacket 2, it may happen that the radius B below the shoulder 9 slightly increases compared to the radius K of the mandrel 21 when removing the molding tool 23. When shaping the shoulder 9, the jacket 2 is compressed by the surface 25 of the molding tool 23 so far that the jacket rests in the region J of the receiving mandrel 21. As already mentioned, while the radius E of the bottom 3 by Compression reduced. By the elastic restoring forces of the paper material is then obtained after the removal of the mold 23 in FIG. 10 shown state in which the radius B has increased slightly again. Despite this elastic recovery, the inventive feature is maintained that the radius B is at most equal to the radius E, and as already described above.

To form the frame 5 with the expansion 10 is in FIG. 10 an outer ring 31 and inner jaws 32 are provided. A jacket 2 facing the inner surface of the outer ring 31 is exposed to the outside and has the angle that the frame 5 should take in the final state. Opposite the outer ring a plurality of inner jaws 32 are provided, wherein in the illustration of FIG. 10 only an inner jaw is shown. The inner jaws 32 may in the representation of FIG. 10 are moved toward the outside, in the direction of the outer ring 31 and thereby press the curl 30 'against the wall 4 of the bottom 3 and finally against the inner surface of the outer ring 31st

For example, either only the jaws 32 or the ring 31 or both the inner jaws 32 and the outer ring 31 are heated, so that simultaneously with the widening of the cup-shaped wall 4, the three then superposed layers of material are sealed together and thereby form the frame 5. A radially outwardly facing surface of the inner jaw 32 is arranged parallel to the inner surface of the outer ring 31 and also has the angle at which the frame 5 should be arranged in the final state.

The inner jaws 32, for example, part of a mandrel, not shown, and can by moving a likewise in FIG. 10 not shown middle part are moved radially outward. The outer ring 31 may be formed as a solid ring or, for example, as an openable ring to facilitate the pushing down of the finished sealed frame 5. Instead of the inner jaws 32, for example, a circumferential roller can be provided, which exert a radially outward, directed toward the inner surface of the outer ring 31 force on the curl 30 'to form the frame 5. During the formation of the frame 5 of the cup remains on the mandrel 21. After forming the frame 5 of the inner cup 1 is completed and can be removed from the mandrel 21.

On the thus finished inner cup 1 is then, see FIGS. 4 and 5 , an outer jacket 13 pushed. This takes place in such a way that the outer jacket 13 is received in an annular outer tool, and by the tapered end of the outer shell 13 a Pilot mandrel is pushed with a suction head. The inner cup 1 is inserted into the outer casing 13. In this case, the suction head engages on the inner cup 1 from below to the bottom 3, sucks on this and pulls the inner cup in the tapered outer shell 13 into until the in the FIGS. 4 and 5 shown state is reached.

To produce the outer jacket 13, a flat blank, which has the shape of a segment of a circular ring, wound on a mandrel and connected to a frusto-conical sleeve in the region of the lower tapered end is then according to FIG. 11 initially a curl 33 preformed. This curl 33 represents a precursor of the curl 20, as shown in the FIGS. 4 and 5 is shown. For the production of in FIG. 5 cup 1 shown, the curl 33 is then pressed flat until the in FIG. 12 shown form of curl is reached. It will be appreciated that the lower edge 19 of the outer jacket 13 formed by the curl 16 is slightly retracted and therefore has a greater taper at the lower end, as previously discussed. In the presentation of the FIG. 12 is on the inside of the curl 20 a knurling or corrugation 34 indicated. Such a knurling or corrugation 34 on the inside of the curl 20 can be provided in order to achieve a higher elasticity when pushing the outer shell 13 onto the inner cup 1. Furthermore, in FIG. 12 the parallel to the outer casing 13 extending portion 17 of the curl 20 recognizable. To get out of the FIG. 11 precursor 33 shown a curl 16 according to FIG. 4 manufacture, only the area 17 is applied in parallel to the outer jacket 13, wherein a further flat pressing is omitted.

When forming the curl 16 according to FIG. 12 the inner radius P of the outer shell 13 is formed smaller than the radius D of the expansion 10. This is already in the presentation of FIGS. 4 and 5 to recognize. When sliding the outer sheath 13, the end of the outer sheath 13 with the curl 16 must therefore expand slightly in order to be pushed over the frame 5 can. This expansion is facilitated by the knurling or corrugation 34. In addition, the longitudinal seam of the outer shell 13 in the region of the curl 16 can not be glued or sealed. As a result, a certain rising of the outer sheath 13 in the region of the curl 16 is facilitated, so that the outer sheath 13 contracts again after being pushed over the frame 5; so that the curl 16 in the in FIG. 5 shown position securely abuts the outside of the frame 5 and is supported there.

It is further noted that a radius G at the upper end 35 of the parallel portion 17 is greater than the outer radius D of the frame 5. This is also FIG. 5 refer to. Since thus the Inner diameter of the outer jacket 13 at the upper edge 35 of the curl 16 is greater than the outer diameter of the expansion 10, this upper edge 35 of the curl 16 can not catch on the frame 5 when pushed onto the frame 5. Instead, the frame 5 runs on the slope, which is formed by the area 17 and upon further pushing the outer shell 13 of this is widened, slips over the area with the largest radius D of the frame 5 and then takes the in FIG. 5 shown position. Obviously, the outer sheath 13 is then held by the residual stress in the outer jacket 13 on the inner cup 1, since to remove the outer shell 13 of this again on the conically widening frame 5 would have to be pulled.

It should be expressly understood that the different configurations of the outer shells 13 and other design means of the cup 1 such as the shoulder 9 or the shoulder 18 can be combined as desired with each other, and are not limited to the variants shown. It should also be noted that the illustrations are not to scale. For reasons of better visibility in particular the inclination angle A of the shell 2 and the size differences of the radii of the shell 2 and the expansion 10 are shown reinforced.

Claims (18)

1. Cup (1) made of a paper material having a fillable interior (6) formed by a conical sleeve (2) and a bottom (3), the bottom (3) being fastened to the sleeve (2) at the lower end of the interior (6) with a skirt (5) in a substantially liquid-tight manner, where a shoulder for holding an identical cup (V) during stacking of several cups is arranged on the sleeve (2) limiting the interior (6), characterized in that the radius (B) of the sleeve (2) - seen with respect to the central axis (8) of the cup (1) - underneath the shoulder (9) is at most just as large as the radius (E) of the sleeve at the level of the bottom (3), wherein underneath the shoulder (9) a portion (F) in the height direction of the sleeve (2) exists in which the angle (A) of the sleeve (2) relative to the central axis (8) is substantially smaller than the angle (A) of the conical sleeve (2) above the shoulder (9).
2. Cup according to Claim 1, characterized in that the sleeve (2) limiting the interior (6) between the shoulder (9) and the bottom (3) is substantially cylindrical.
3. Cup according to any one of the Claims 1 to 2, characterized in that the sleeve (2) and/or the bottom (3) in the area of the skirt (5) and/or the skirt (5) itself has at least in an area along the circumference an outward-projecting widened portion (10) and in that a lower rim (11) of the widened portion (10) forms a standing surface for the cup (1) and in that the outer radius (D) of the widened portion (10) is greater than the outer radius (E') of the sleeve (2) at the level of the bottom (3).
4. Cup according to any one of the Claims 1 to 3, characterized in that the cup (1) has an outer sleeve and in that a conical outer sleeve (13) has in a rim area an inward-facing curl (16) that has an area (17) running substantially parallel to the outer sleeve (13).
5. Method for manufacture of a cup made of a paper material comprising a conical sleeve and a bottom fastened in a liquid-tight manner by a skirt in the area of the smaller circumference of the sleeve, where a shoulder is shaped into the sleeve for holding an identical cup during stacking of several cups, characterized in that to shape the shoulder an area of the sleeve is shaped to give a radius - seen with respect to the central axis of the cup - that is smaller than the radius of the sleeve in the completed cup at the level of the bottom and in that underneath the shoulder (9) a portion (F) in the height direction of the sleeve (2) is shaped, in which the angle (A) of the sleeve (2) relative to the central axis (8) is substantially smaller than the angle (A) of the conical sleeve (2) above the shoulder (9).
6. Method according to Claim 5, characterized in that in a portion in the height direction of the sleeve is shaped to give a constant radius.
7. Method according to Claim 5 or 6, characterized in that the shoulder is shaped before the bottom is connected substantially in liquid-tight manner to the sleeve, that the bottom is, during shaping of the shoulder, already inside the sleeve shaped into a tube and/or that the outer radius of the bottom is reduced in the elastic area by compression during shaping of the shoulder.
8. Method according to any one of the Claims 5 to 7, characterized in that in a method step subsequent to the shaping of the shoulder the bottom is connected in substantially liquid-tight manner to the sleeve while forming a skirt.
9. Method according to any one of the Claims 5 to 8, characterized in that during formation of the skirt the sleeve and/or the bottom in the area of the skirt and/or the skirt itself is widened outwards at least in an area along the circumference such that a lower rim of the widened portion forms a standing surface for the cup.
10. Method according to any one of the Claims 5 to 9, characterized in that a vertical portion of the sleeve is shaped to be substantially cylindrical for formation of the shoulder.
11. Method according to any one of the Claims 5 to 10, characterized in that an outer sleeve is slid onto the conical sleeve limiting the interior and fixed, wherein - after shaping of a widened skirt - the outer sleeve pre-shaped in a tube form is slid in the axial direction onto the conical sleeve limiting the interior.
12. Method according to Claim 11, characterized in that the outer sleeve pre-shaped in a tube form has - when slid onto the conical sleeve limiting the interior - at least in one area a radius smaller than the outer radius of the skirt at the lower rim of the widened portion.
13. Device for manufacture of a cup made of a paper material with a receiving mandrel for a conical sleeve and a bottom of the cup, the receiving mandrel having a step for forming a shoulder in the sleeve, characterized in that an area (J) in which the radius (K) of the receiving mandrel (21) - when seen relative to the central axis (8) of the receiving mandrel (21) - is smaller than the outer radius (E) of the cup bottom (3) adjoins the step (22) of the receiving mandrel (21), and in that the area (J) is arranged for forming the portion (F) in the height direction of the sleeve (2), in which the angle (A) of the sleeve (2) relative to the central axis (8) is substantially smaller than the angle (A) of the conical sleeve (2) above the shoulder (9).
14. Device according to Claim 13, characterized in that a portion (J) in the height direction of the receiving mandrel (21) has a constant radius (K).
15. Device according to any one of the Claims 13 to 14, characterized in that a cylindrical area (J) of the receiving mandrel (21), in which the radius (K) of the receiving mandrel is less than the outer radius (E) of the bottom (3), adjoins the step (22), in that the step (22) has the shape of a circumferential surface of a frustum, and in that the device has a shaping tool (23) interacting with the receiving mandrel (21) for shaping the shoulder (9) and movable along the central axis (8) of the receiving mandrel (21) and/or that the shaping tool (23) has a means (29) for shaping a curl (30) of the sleeve (2) enclosing the bottom (3).
16. Device according to any one of the Claims 13 to 15, characterized in that the shaping tool (23) is designed as a ring enclosing the sleeve (2).
17. Device according to Claim 16, characterized in that the ring (23) has an inner radius (M) that is smaller than the outer radius (E) of the cup bottom (3).
18. Device according to any one of the Claims 13 to 17, characterized in that the shaping tool (23) has recesses (26) running parallel to the central axis (8) for shaping ribs (27).

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