EP0810572B1

EP0810572B1 - Labels and manufacture thereof

Info

Publication number: EP0810572B1
Application number: EP97202465A
Authority: EP
Inventors: David John Instance
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-09-28
Filing date: 1990-09-28
Publication date: 2003-01-22
Anticipated expiration: 2010-09-28
Also published as: WO1991004851A1; CA2067115C; DE69034038D1; DK0628941T3; DE69034038T2; EP0494191B1; DE69032274D1; ES2191807T3; ES2072448T3; DE69017701T2; EP0810572A2; DE69017701D1; DK0810572T3; CA2067115A1; HK139895A; ATE231637T1; ATE165470T1; EP0628941A3; ES2115863T3; EP0628941B1

Abstract

A method of producing a succession of self-adhesive labels on a length of release material, which method comprises the steps of:- (a) applying a layer of pressure-sensitive adhesive to a surface of a length of release material; (b) applying a succession of individual folded sheets to the layer of pressure-sensitive adhesive so as to adhere the folded sheets to the release material, each folded sheet having an upper panel and a lower panel; (c) applying to the succession of folded sheets on the release material a web of a self-adhesive laminar material whereby the laminar material is adhered by the self-adhesive surface thereof over the succession of folded sheets; (d) cutting through the laminar material, the folded sheets and the pressure-sensitive adhesive as far as the release material thereby to form the self-adhesive labels, the cutting step being carried out whereby the upper panel of the folded sheet with the laminar material adhered thereto can be pulled away from the lower panel thereby to open the label; and (e) removing from the release material waste portions of the laminar material, of the folded sheets and of the pressure-sensitive adhesive which surround the self-adhesive labels. The invention also relates to self-adhesive labels. <IMAGE>

Description

The present invention relates to a method of producing labels and in particular to a method of producing a succession of self-adhesive labels on a length of release material. The present invention also relates to a self-adhesive label.
In the packaging field there is a great demand for high quality pre-printed labels for labelling containers of various types. In order to facilitate the packaging and labelling of containers at a fast rate it is generally required that the labels to be attached to the containers be made available in a form in which they are easy to handle and easy to transfer onto the containers for which they are intended. In one convenient arrangement the labels are self-adhesive labels which are carried in a series on a web of release material which is wound into a reel. The Applicant's earlier GB-A-2199010 discloses a method and apparatus for producing labels in which self-adhesive labels are carried directly on a release material.
EP-A-0192444 discloses a self-adhesive label having the features of the pre-characterising portions of claims 1 and 10.
It is an aim of the present invention to provide an improved method of producing labels which is a development of the Applicant's earlier method.
Accordingly the present invention provides a self-adhesive label comprising a self-adhesive support web carried on a backing of release material, a folded sheet disposed on the support web, the folded sheet including an upper panel having a folded edge at which the upper panel is connected to a lower panel of the sheet and an opposite free outer edge, the folded edge being disposed over the support web, and a self-adhesive laminar material which covers the upper panel and extends past the folded edge to form a first end portion thereof which is adhered to the support web, a second end portion of the self-adhesive laminar material and the free outer edge extending past the support web to form an openable edge of the label comprising the end portion of self-adhesive laminar material, the free outer edge over which the second end portion is adhered and a layer of pressure sensitive adhesive on the backing of release material
The present invention also provides a method of producing a succession of self-adhesive labels on a length of release material, which method comprises the steps of:- (a) providing a succession of self-adhesive support webs carried on a length of release material; (b) applying a succession of folded sheets to the succession of support webs, each folded sheet comprising an upper panel connected to a lower panel by a folded edge, each sheet being applied whereby the folded edge is disposed over the support web and a free outer edge of the upper panel extends past the support web; (c) adhering over the folded sheets and the support webs a self-adhesive laminar material whereby the laminar material is adhered by the self-adhesive surface thereof to the folded sheets and exposed parts of the support webs; (d) cutting through the laminar material, the folded sheets and the support webs as far as the release material to form the self-adhesive labels, whereby in each label the laminar material extends past the folded edge to form a first end portion thereof which is adhered to the support web and extends past the support web to form a second end portion thereof, an openable edge of the label comprising the second end portion of the self-adhesive laminar material, the free outer end over which the second end portion is adhered, and a layer of pressure-sensitive adhesive on the backing of release material; and (e) removing from the release material waste portions of the laminar material, of the folded sheets and of the support webs which surround the self-adhesive labels.
Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:-
Figure 1 is a diagrammatic elevation of an apparatus for producing self-adhesive labels in accordance with the present invention;
Figure 2 is a diagrammatic elevation of a folded sheet for incorporation into a first self-adhesive label not in accordance with the present invention;
Figure 3 is a perspective view of the folded sheet of Figure 2 when adhered to a length of release material by a layer of pressure-sensitive adhesive;
Figure 4 is a perspective view of the folded sheet assembly of Figure 3 after application thereover of a self-adhesive laminar material and after die-cutting to produce a self-adhesive label not in accordance with the present invention;
Figure 5 shows the self-adhesive label of Figure 4 when adhered to a container and after the label has been opened to reveal previously hidden surfaces;
Figure 6 is a perspective view of a second self-adhesive label not in accordance with the present invention when carried on a length of release material; and
Figure 7 is a perspective view of a self-adhesive label in accordance with an embodiment of the present invention when carried on a length of release material.
For the avoidance of doubt, Figures 2 to 6 do not illustrate labels or the manufacture of labels in accordance with the invention, but those Figures and the accompanying description are included for the purpose of clarity of illustration of the embodiment of the label shown in Figure 7 and its manufacture.
Referring to Figure 1, there is shown an apparatus for producing labels in accordance with the method of the present invention. A web of release material 2 is fed out from a reel 4 thereof past an adhesive applicator 6 which is adapted to deposit a layer of pressure-sensitive adhesive (not shown) over the upper surface of the release material 2. The release material 2 typically comprises waxed or siliconized paper. The adhesive may be extruded in a hot melt form and may be extruded either as a continuous uniform layer or in the form of a row of extruded beads. The adhesive-coated release material 2 then passes to a folded sheet applying station 8 at which a succession of individual folded sheets 10 are applied to the layer of pressure-sensitive adhesive so as to adhere the folded sheets 10 to the release material 2. The folded sheets 10 are described in greater detail below. The succession of folded sheets 10 carried on the release material 2 is then passed to a laminar material applying station 12 at which a self-adhesive laminar material 14, which is fed out from a reel 13 thereof, is applied to the succession of folded sheets 10 on the release material 2. The self-adhesive laminar material 14 comprises a layer of plastics material, preferably transparent polyester or polyethylene, coated on one side with a pressure-sensitive adhesive. The laminar material 14 is adhered by the downwardly-directed self-adhesive surface thereof over the succession of folded sheets 10. The laminar material - coated assembly then passes to a die-cutting station 15 at which the self-adhesive labels 16, which will be described in greater detail below, are formed by cutting through the laminar material 14, the folded sheets 10, and the pressure-sensitive adhesive as far as the release material 2. The die-cutting is carried out by a pair of die-cutting rollers 17. At the die-cutting station 15, a waste web remnant 18, consisting of waste portions of the laminar material 14, of the folded sheets 10 and of the pressure-sensitive adhesive which surround the self-adhesive labels 16, is removed from the release material 2 and wound up into a reel 20 for subsequent disposal. The succession of self-adhesive labels 16 on the release material 2 is then wound up into a reel 22 which subsequently can be mounted in an automatic labelling machine (not shown) for automatic application of the labels to containers to be labelled.
Figure 2 shows a lithographically-printed folded sheet 100 which is employed in the manufacture of a self-adhesive label not in accordance with the present invention. The folded sheet 100 comprises a rectangular longitudinal strip which is divided into an upper panel 102 and a lower panel 104 which is connected to the upper panel 102 by a folded edge 106 of the folded sheet 100. Although not illustrated, a number of additional panels may be disposed between the upper panel 102 and the lower panel 104. When present, the additional panels are connected to one or both of the upper and lower panels 102,104. The upper panel 102 completely covers and extends past the lower panel 104 so as to have a rearwardly-directed surface 108 which is adjacent to the rearwardly-directed surface 110 of the lower panel 104. Accordingly, the rear surface of the folded sheet 100 comprises the rearwardly-directed surfaces 108 and 110. The upper surface 112 of the upper panel 102 is lithographically printed as are the opposed inner surfaces 114, 116 of the upper and lower panels 102, 104. The self-adhesive label of Figure 2 is manufactured by employing the apparatus illustrated in Figure 1, the description of which will not be repeated. Figure 3 shows a folded sheet 100 which has been adhered to a length of release material 118 by a layer 120 of pressure-sensitive adhesive, prior to the laminar material applying station 12. The rearwardly-directed surfaces 108, 110 of the folded sheet 100 are adhered by the layer 120 of pressure-sensitive adhesive to the release material 118.
The assembly shown in Figure 3 is then passed to the laminar material applying station 12 and then to the die-cutting station 15 and Figure 4 shows the resultant assembly after the application of the laminar material and die-cutting of the combined assembly to form the self-adhesive labels on the release material. The laminar material comprises a transparent plastics material, such as polyester or polyethylene. From Figure 4 it will be seen that a cut portion of the laminar material 112 constitutes the upper surface of the resultant self-adhesive label 124. During the die-cutting step, the folded sheet 100 has had the longitudinal edges thereof cut away and also the free outer edge of the extending part of the upper panel 102 has also been cut away. The laminar material 122 is coincident with the cut longitudinal edges 126, 128 of the folded sheet 100 and is also coincident with the cut transverse edge 130 of the folded sheet 100. The laminar material 122 extends beyond the folded edge 106 of the folded sheet 100 to form an end flap 132 thereof which is adhered by a combination of its self-adhesive surface and the layer 120 of pressure-sensitive adhesive to the release material 118. The self-adhesive label 124 is maintained in its closed configuration by the adhesion of the rearwardly-directed surface 108 of the upper panel 102 to the release material 118.
Figure 5 shows the label 124 of Figure 4 when adhered to a container 134. The rearwardly-directed surface of the label 124 consists of that portion of the layer of adhesive 120 which is adhered to the rearwardly directed surfaces 108, 110 of the upper and lower sheets 102, 104 and the rearwardly directed surface of the flap 132 of the laminar material 122. When the label 124 is removed from the release material 118, the portion of the layer of adhesive 120 is stripped off therewith and that portion of the layer of adhesive 120 adheres the label 124 to the container 134. When it is desired to open the label 124 and access the concealed surfaces of the upper and lower panels 102, 104, a user pulls the free outer edge 136 of the upper panel 102 away from the lower panel 104. The free outer edge 136 and the'part of the layer of pressure-sensitive adhesive 120 which is adhered directly to the rearwardly directed surface 108 of the upper panel 102 are stripped off from the container as a result of preferential adhesion of the adhesive to the rearwardly-directed surface 108 of the upper panel. The portion 138 of the adhesive layer 120 remains adhered to the upper panel 102 as is shown in Figure 11. When a user has finished reading the information on the label 124, he can re-close the label 124 by folding the upper panel 102 back over the lower panel 104 and by re-adhering the adhesive part 138 to the container 134.
In the label of Figures 2 to 5, the folded edge 106 is protected from being accidentally caught and pulled away from the container to which it is adhered by the laminar material 122 which extends over the folded edge 106 to form the flap 132. Thus the resultant label 124 is reliably and securely adhered over its whole surface to the container 134. As is shown in Figures 4 and 5, in the die-cutting step the corners of the label are preferably cut rounded. This is carried out not only for aesthetic purposes but also to assist a user in opening the resultant label and also to reduce the chances of the corners of the label being bent or caught by extraneous objects.
If desired, the layer of pressure-sensitive adhesive 120 may be applied to the release material as a non-continuous layer whereby a corner of the rearwardly directed surface 108 of the outer edge 136 of the upper panel 102 is not coated with adhesive - this assists in a user being able to pull the upper panel 102 away from the lower panel 104 in order to open the label.
Figure 6 shows a further label 150 also not in accordance with the present invention when carried on a length of release material 152. This label is different from that illustrated in Figure 2 to 5 in that the self-adhesive laminar material 154 extends substantially past the folded edge 156 of the folded sheet 158 thereby to define a label portion 160 which is adjacent the folded sheet 158. The self-adhesive laminar material is of transparent plastics such as polyester or polyethylene and has an image 162 printed on the rearwardly-directed surface 164 thereof, which image is disposed in the portion of the label adjacent to the folded sheet. In the manufacture of the labels, the laminar material 14 shown in Figure 1 would consist of a length of transparent plastics material having a succession of images 162 printed on its lower surface 164. The laminar material 14 would be adhered over the assembly of folded sheets/pressure-sensitive adhesive/release material with the image 162 on the transparent laminar material being in registration adjacent a respective folded sheet 158. In the die-cutting step, the die-cutting would be carried out so that each label 150 includes a respective printed image 162 on the transparent laminar material 154 and a respective folded sheet 158 adjacent thereto.
Figure 7 shows a label 250 in accordance with an embodiment of the present invention when carried on the length of release material 252, the label 250 being a modification of the label of Figure 6. This label is different from that illustrated in Figure 6 in that prior to the application of pressure-sensitive adhesive 264 to the release material, the release material is provided thereover with a succession of support webs, each of which comprises a layer of paper or other material which is coated on its rear surface with a pressure-sensitive'adhesive and is carried on the release material. These support webs have been produced by die-cutting pressure-sensitive stock, comprising the paper or other material releasably adhered on the release paper, with the waste remnant having been removed. Thus in the apparatus of Figure 1 the reel 4 comprises the release material 2 with a succession of self-adhesive support webs thereon. Referring to Figure 7 again, the self-adhesive label 250 has a lower self-adhesive support web 270 e.g. of paper which is coated on its rear surface with a layer 272 of pressure-sensitive adhesive and is releasably adhered to the release material 252. The support web 270 is coextensive with all of the self-adhesive label 250 apart from the free outer edge 274 of the folded sheet 258 which is intended to be releasably adhered to the release material 152. Accordingly, the free outer edge 274 is directly adhered to the release material 252 by the layer 264 of pressure-sensitive adhesive which has been applied over the release material/support web combination by the adhesive applicator 6 shown in Figure 1.
In the manufacture of the label of Figure 7 the folded sheets have been applied in succession over the succession of support webs 270 but also ensuring that the portion (i.e the free outer edge) of the folded sheets which is intended to be releasably adhered to the release material is not disposed over a part of the support web but rather is disposed over the release material. Initially, the support web which is carried on the release material is larger than that which is present in the resultant label. During the die-cutting step, the extra peripheral part of the support web is cut simultaneously with the cutting of the laminar material 254 the applied sheet 258 and the pressure-sensitive adhesive 264 and the combined waste web remnant is then removed. Thus in each resultant label the support web 270, together with the rear layer of adhesive 272, is coextensive with the majority of the label 250. The advantage of this configuration is that the support web provides extra strength and rigidity to the resultant self-adhesive labels.
In the illustrated embodiment, the self-adhesive laminar material is.coated with a pressure-sensitive adhesive. However, in alternative embodiments, the laminer material is not'uniformly coated with pressure-sensitive adhesive, but rather is provided with uncoated patches which, for example, coincide with part or all of the applied folded sheets. In further alternative embodiments, the self-adhesion is provided not by a layer of pressure-sensitive adhesive but by a heat-sealable material such as a hot-melt adhesive, lacquer or plastics material which is subsequently heat sealed.

Claims

A self-adhesive label (250) comprising a self-adhesive support web (270) carried on a backing of release material (252), a folded sheet (258) disposed on the support web (270), the folded sheet (258) including an upper panel having a folded edge at which the upper panel is connected to a lower panel of the sheet and an opposite free outer edge (274), the folded edge being disposed over the support web (270), and a self-adhesive laminar material (254) which covers the upper panel and extends past the folded edge to form a first end portion thereof which is adhered to the support web (270), a second end portion of the self-adhesive laminar material (254) and the free outer edge (274) extending past the support web (270) to form an openable edge of the label (25) comprising the end portion of self-adhesive laminar material (254), the free outer edge (274) over which the second end portion is adhered and a layer (264) of pressure sensitive adhesive on the backing of release material (252).
A self-adhesive label according to claim 1 further comprising at least one additional panel which is disposed between the upper and lower panels.
A self-adhesive label according to claim 1 or claim 2 wherein the first end portion of the laminar material (254) and the underlying part of the support web (270) to which the laminar material (254) is adhered are coextensive.
A method of producing a succession of self-adhesive labels (16) on a length of release material (2), which method comprises the steps of:-

(a) providing a succession of self-adhesive support webs carried on a length of release material (2);

(b) applying a succession of folded sheets (10) to the succession of support webs, each folded sheet (10) comprising an upper panel connected to a lower panel by a folded edge, each sheet being applied whereby the folded edge is disposed over the support web and a free outer edge of the upper panel extends past the support web;

(c) adhering over the folded sheets (10) and the support webs a self-adhesive laminar material (14) whereby the laminar material (14) is adhered by the self-adhesive surface thereof to the folded sheets (10) and exposed parts of the support webs;

(d) cutting through the laminar material (14), the folded sheets (10) and the support webs as far as the release material (2) to form the self-adhesive labels (16), whereby in each label (16) the laminar material (14) extends past the folded edge to form a first end portion thereof which is adhered to the support web and extends past the support web to form a second end portion thereof, an openable edge of the label (16) comprising the second end portion of the self-adhesive laminar material, the free outer end over which the second end portion is adhered, and a layer of pressure-sensitive adhesive on the backing of release material (2); and

(e) removing from the release material (2) waste portions of the laminar material (14), of the folded sheets (10) and of the support webs which surround the self-adhesive labels (16).
A method according to claim 4 wherein the succession of self-adhesive support webs carried on a length of release material (2) is produced by die-cutting pressure-sensitive stock comprising a self-adhesive material carried on a release material (2) and removing the waste web remnant.
A method according to claim 4 or claim 5 wherein the folded sheet (10) further includes at least one additional panel which is disposed between the upper and lower panels.
A method according to any one of claims 4 to 6 wherein the cutting step (d) is carried out whereby the end portion of the laminar material (14) and the underlying part of the support web to which the laminar material (14) is adhered are coextensive.