WO1988000116A1 - Procede et installation pour realiser par injection des objets en matiere thermoplastique - Google Patents

Procede et installation pour realiser par injection des objets en matiere thermoplastique Download PDF

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Publication number
WO1988000116A1
WO1988000116A1 PCT/EP1987/000338 EP8700338W WO8800116A1 WO 1988000116 A1 WO1988000116 A1 WO 1988000116A1 EP 8700338 W EP8700338 W EP 8700338W WO 8800116 A1 WO8800116 A1 WO 8800116A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
injection mold
weld line
temperature
thermoplastic material
Prior art date
Application number
PCT/EP1987/000338
Other languages
German (de)
English (en)
Inventor
Paul Thienel
Original Assignee
Pfaehler, Helmut
Stieger, Max
Von Weizenbeck, Walter
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfaehler, Helmut, Stieger, Max, Von Weizenbeck, Walter filed Critical Pfaehler, Helmut
Publication of WO1988000116A1 publication Critical patent/WO1988000116A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould

Definitions

  • the invention relates to a method and an arrangement for the injection molding of objects made of thermoplastic material in an injection mold effecting weld lines on the object.
  • Injection molds for objects with openings or differences in wall thickness, as well as injection molds with several gate openings intended for filling create several flow streams of the melt during mold filling, which collide with their flow flow fronts. Since the flow stream fronts of the flow streams, which are normally heated far above the melting temperature, can cool prematurely on the injection mold which is cooled to shorten the production cycle times, notches are formed along the weld lines on the finished item, which notches have the appearance and the mechanical properties of the item affect.
  • the weld line notches have so far been removed by subsequent processing, such as polishing or painting.
  • DE-OS 1 938 496 discloses orientations and to prevent residual stresses in injection molded parts made of thermoplastic material by the injection mold being alternately heated and cooled again in the cycle cycle of the injection molding machine.
  • the injection mold contains channels in its mold wall, through which hot oil or water vapor is pumped to heat the mold, while a coolant flows through the channels for cooling. During the heating phase, the injection mold is at least partially heated to a temperature which is considerably above the melting temperature. The considerable heating of the injection mold leads to a substantial increase in the cycle time of cyclically operating injection molding machines.
  • melt injected into the injection mold is additionally produced by microwave heating, high-frequency heating or ultrasonic heating to warm up.
  • the invention presented in the claims takes advantage of the fact that, in the case of cyclically operating injection molding machines, there is sufficient time between opening and ejecting a currently manufactured object, on the one hand, and completely filling the closed injection mold in the next injection cycle, on the other
  • a contact temperature that is only slightly less than the melting temperature of the thermoplastic material.
  • the contact temperature is to be understood here and in the following as the temperature that the mold surface has when it comes into initial contact with the injected thermoplastic material.
  • the melting temperature is to be understood as the softening temperature and in the case of partially crystalline thermoplastic material the crystallite melting temperature.
  • the area to be heated is limited to a comparatively narrow strip of the mold surface along the weld line of a few millimeters on both sides of the weld line, the additional amount of heat to be removed from the surface area of the weld line during the holding and cooling phase is comparatively low, so that there is no noticeable increase in the cycle time overall.
  • the method according to the invention is best carried out on a clock-controlled or clock-controlled injection molding machine which plasticizes the thermoplastic material, injects it under pressure into the injection mold and opens the injection mold for the removal of the object and then closes it again.
  • a clock-controlled or clock-controlled injection molding machine which plasticizes the thermoplastic material, injects it under pressure into the injection mold and opens the injection mold for the removal of the object and then closes it again.
  • the area of the mold surface of the injection mold in the area of the weld line which heats up can then be controlled by a heating time control which is synchronized with the machine control or regulation of the injection molding machine.
  • the heating device controlled by the heating time control must be designed in such a way that it has heated the strip-shaped area of the mold surface adjacent to the weld line to the desired contact temperature in the area of the melting temperature at the latest at a time when the two have
  • thermoplastic material can flow into the injection mold to compensate for the weld line notch. It has proven to be expedient if the heating device is switched off as soon as the volumetric filling of the injection mold is reached.
  • the aim is for the heating device to provide one
  • the heating device expediently comprises elongated, electrical resistance heating cartridges which are installed as close as possible under the surface of the mold in the wall of the injection mold, in such a way that they essentially extend along the weld line.
  • the distance between the heating cartridge and the mold surface should be as small as possible, on the other hand, however, the remaining material cross section of the wall cannot be made arbitrarily small as a result of the high pressures which occur during the filling of the mold.
  • a distance of approximately 2 mm between the mold surface and the heating cartridge has proven to be suitable.
  • the heating device which is preferably in the form of an electrical resistance heating cartridge, does not directly heat the wall of the injection mold, but instead a bridge part made of a material that is more thermally conductive than the mold wall.
  • the heating device can thus be installed at a comparatively large distance from the area of the mold surface following the strip seam, and the bridge part transfers the heat to this area.
  • the bridge part expediently consists of Berylliu copper.
  • a bridge part made of a material which is a good conductor of heat also has the advantage that its end adjacent the weld line can easily be adapted to a more complicated shape of the weld line course, so that the heating power can be brought close to the mold surface even with curved mold surfaces .
  • the bridge part easily absorbs the high pressure forces.
  • the heating time control expediently comprises a temperature control circuit which uses a temperature sensor to control the temperature in the vicinity of the mold surface to be heated detected.
  • the temperature sensor is preferably part of the heating cartridge.
  • the area of the mold tending to weld lines not only can be heated by the fact that the area adjacent to it region of the mold wall is heated to a contact temperature slightly below the melting temperature, but heating devices can also be used which directly heat the melt in the bonding area.
  • High-frequency or microwave sources radiating in strips are suitable.
  • strip-shaped ultrasound sources are particularly suitable, since the heat capacity of the material to be heated means that the mold wall can be kept very small after the mold wall does not have to be heated as well.
  • the latter type of heating the area of the weld line can also be used in methods and arrangements in which the contact temperature of the melt in the area of the weld line is raised to values which are considerably higher than the melting temperature, ie the Softening or crystallite melting temperature. This also considerably reduces the inhomogeneity of the plastic in the area of the weld line and thus improves the mechanical properties (eg strength).
  • 1 shows a schematic illustration of an injection molding machine on which the method according to the invention can be carried out
  • 2 shows a plan view of a mold half of an injection mold that can be used in the context of the invention
  • Fig. 3 is a sectional view through the injection mold, seen along a line III-III in Fig. 2;
  • Fig. 4 is a sectional view of a variant of an
  • FIG. 5 is a sectional view through the injection mold, seen along a line VV in FIG. 4.
  • FIG. 1 schematically shows a conventional injection molding machine 3 equipped with a screw piston 1, which, controlled by a machine controller 5 in a cycle, plasticizes thermoplastic material by heating and compression and injects it via a sprue opening 7 into a mold interior of an injection mold, generally designated 11 .
  • the injection molding machine 3 heats the thermoplastic material to a temperature which is considerably above the melting temperature, i.e. in the case of amorphous materials via the softening temperature or in the case of partially crystalline materials via the crystallite melting temperature.
  • the walls of the injection mold 11 contain a system of cooling channels 13 through which coolant circulates, which constantly keeps the walls of the injection mold at a temperature below the melting temperature in order to allow the injection-molded object to solidify and demold.
  • the machine controller 5 not only controls the filling phase, but also the compression phase that follows until the injection mold 11 is completely filled, and the subsequent holding pressure phase of the injection molding machine 3.
  • the machine controller 5 also controls a mold-closing unit (not shown) which controls the Injection mold 11 opens and closes again and, if necessary, ejects the molded object.
  • the injection mold 11 can form a breakthrough or the like in the object to be molded
  • Contain mold core 14 which divides the melt flowing into the injection mold 11 via the sprue opening 7 into two partial streams, which reunite after the mold core 14 to form a weld line indicated at 15. Such weld lines also occur in others
  • Shape configurations for example when filling over several sprue openings or in the case of step-like changes in the wall thickness of the object to be cast.
  • equidistant flow fronts of the melt flows are drawn in at 17 for better explanation. The field of flow fronts clearly shows that the through the
  • the injection mold is provided with heating devices 19, which make it possible to heat the weld line for a limited time only in the area of a narrow strip of the mold surface projecting only a few millimeters above the weld line.
  • the heating device 19 and the strip-shaped region which it heats in a substantially congruent manner in FIG. 1 extends essentially over the entire length of the weld line 15.
  • a heating time control synchronized with the machine control 5 switches on the heating device 19 at least for part of a time interval in each cycle of the injection molding machine 3, which begins with the opening of the injection mold 11 for the demoulding of an object and with complete filling of the injection mold 11, i.e. the end of the compression phase or the beginning of the holding and cooling phase. During this period, the heating time control 21 keeps the temperature in the surface area of the weld line at one
  • Temperature setting member 23 adjustable value.
  • the fact- Real temperature in the surface area of the weld line is detected by means of a temperature sensor 25.
  • the heating time control 21 can only respond to the opening and closing of the injection mold 11. Expediently, however, adjustable timing elements are provided via adjusting elements 27, which are triggered when the injection mold 11 is opened and which define a predetermined switch-off delay for the heating device 19.
  • the heating time control 21 heats the surface area of the weld line in the time interval between the opening of the injection mold 11 and the end of the compression phase of the next injection molding cycle to a contact temperature which, in the case of amorphous thermoplastic material, is only a little, preferably about 5 C below the softening temperature in the case of partially crystalline thermoplastic material, it is only slightly, preferably about 10 C, below the crystallite melting temperature. Surface notches along the weld line are completely avoided in this way. Since the area to be heated is spatially limited to the surface area of the weld line, the heat capacity is comparatively low, so that the cooling phase is not extended accordingly. Since the heating already begins with the opening of the injection mold 11, a period of time already provided in the cycle is used for the heating. Overall, the cycle time is therefore not increased or is increased only insignificantly.
  • the heating device 19 can be a strip-type radiating high-frequency source or a strip-type radiating microwave source. In particular, however, it can be a strip-shaped ultra-sound source, which enables it to be particularly narrow
  • Injection molds which can be used in conjunction with the machine according to FIG. 1 and which have elongated, electrical resistance heating cartridges as the heating device are explained below. Parts having the same effect are provided with the reference numerals of FIG. 1 and to distinguish them with a letter. For further explanation, reference is therefore made to the description of FIG. 1.
  • FIG. 2 and 3 show an injection mold 11a which contains a bore 35 in its wall 31 at a close distance 33 of, for example, 2 mm below the inner mold surface 9a delimiting the weld line 15a, in which an electrical, elongated, cylindrical. stand heating cartridge 19a sits.
  • the heating cartridge 19a extends essentially over the entire length of the weld line 15a and is exchangeably screwed into the bore 35. It carries the temperature sensor 25a of the heating time control from FIG. 1 at its tip.
  • the diameter of the heating cartridge 19a is comparatively small in order to keep the material volume of the wall 31 to be heated as low as possible. Cartridges with a diameter of a few millimeters are suitable.
  • the position of the weld line relative to the injection mold can in some cases make it impossible to install the resistance heating cartridge directly adjacent to the surface of the weld line. This can be the case, for example, if the weld line area is not accessible in its longitudinal direction from an outer surface of the mold, or if the location most suitable for the installation already contains other structural components of the mold, for example cooling channels.
  • the injection mold 11b of FIG. 4 and 5 heats an electrical resistance heating cartridge
  • the 19b does not directly adjoin the area of a mold wall 41 of the injection mold 11b that is adjacent to the weld line, but via a bridge part 43 made of a material that is better conductive than the mold wall material, for example beryllium copper.
  • the bridge part 43 is seated in a recess 45 of the mold wall 41, which extends to close to the inner mold surface 9b in the region of the weld line 15b heraner- '.
  • the cutout 45 also ends here with a small distance of, for example, 2 mm from the interior of the mold.
  • the heating cartridge 19b sits at a large distance in one. suitably arranged bore 47 of the 'bridge portion 43 and the mold wall 41.
  • the temperature sensor 25b is located in the bridge part 43 in the vicinity of the conical outlet. However, similar to the temperature sensor 25a from FIG. 3, it can also be part of the heating cartridge 19b.

Abstract

Dans le procédé décrit, afin d'éviter la présence d'entailles en surface le long des lignes de joint (15), la température du moule d'injection (11), refroidi par ailleurs, est accrue, au moyen d'un dispositif de chauffage (19), dans une région limitée dans l'espace, en forme de bande et en suivant la ligne de joint (15), sauf dans la région de surface de ladite ligne de joint, et dans un intervalle de temps commençant à l'ouverture du moule (11) et s'achevant au terme de son remplissage complet. On peut ainsi empêcher la formation d'entailles au niveau des lignes de joint sans rallonger la durée du cycle d'injection.
PCT/EP1987/000338 1986-06-26 1987-06-25 Procede et installation pour realiser par injection des objets en matiere thermoplastique WO1988000116A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3621379.9 1986-06-26
DE19863621379 DE3621379A1 (de) 1986-06-26 1986-06-26 Verfahren und vorrichtung zur beseitigung von fliess- bzw. bindenahteinkerbungen in spritzgiessteilen aus thermoplast

Publications (1)

Publication Number Publication Date
WO1988000116A1 true WO1988000116A1 (fr) 1988-01-14

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ID=6303730

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000338 WO1988000116A1 (fr) 1986-06-26 1987-06-25 Procede et installation pour realiser par injection des objets en matiere thermoplastique

Country Status (3)

Country Link
EP (1) EP0271555A1 (fr)
DE (1) DE3621379A1 (fr)
WO (1) WO1988000116A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6224813B1 (en) * 1998-11-24 2001-05-01 Daewoo Electronics Co., Ltd. Method for controlling temperature of mold for injection molding
US6755640B2 (en) * 2001-10-31 2004-06-29 Krauss-Maffei Kunststofftechnik Gmbh Plastics injection molding machine
WO2016036549A1 (fr) * 2014-09-03 2016-03-10 iMFLUX Inc. Procédé de moulage par injection avec chauffage localisé dans des régions à écoulement difficile

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257129B4 (de) * 2002-12-05 2006-04-13 Kunststoff-Institut für die mittelständische Wirtschaft NRW GmbH Verfahren zum Herstellen von Formteilen aus Kunststoff und ein Werkzeug hierfür
DE102010054660A1 (de) * 2010-12-15 2012-06-21 Volkswagen Ag Formwerkzeug, insbesondere zur Herstellung von Spritzgussformteilen, sowie Steuerungsverfahren und Herstellverfahren für ein entsprechendes Formwerkzeug
DE102011075107A1 (de) 2011-05-03 2012-11-08 Universität Stuttgart Vorrichtung zur Temperierung eines Werkzeugs
DE202012100504U1 (de) 2012-02-15 2013-05-17 Kunststoff-Institut für mittelständische Wirtschaft NRW GmbH (KIMW NRW GmbH) Kunststoffurformwerkzeug
DE102013021752B3 (de) * 2013-12-20 2015-05-28 Erni Production Gmbh & Co. Kg Steckverbinder, sowie Werkzeug und Verfahren zu seiner Herstellung
EP4086059A1 (fr) 2021-05-07 2022-11-09 Heraeus Amloy Technologies GmbH Insert d'outil pour un outil de moulage, ainsi qu'outil de moulage équipé d'un tel insert d'outil

Citations (9)

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Publication number Priority date Publication date Assignee Title
US2182389A (en) * 1937-04-29 1939-12-05 Standard Products Co Method and means for molding thermoplastic articles
US2360023A (en) * 1942-04-28 1944-10-10 Hydraulic Dev Corp Inc Control of weld lines
AT183955B (de) * 1952-11-14 1955-12-10 Heinz Faigle Verfahren und Vorrichtung zur Herstellung von Formstücken
DE1203456B (de) * 1961-01-09 1965-10-21 Licentia Gmbh Heizvorrichtung an der Spritzduese fuer thermoplastische Kunststoffe verarbeitende Spritzgiessmaschinen
DE2014306A1 (en) * 1970-03-25 1971-10-14 Anker Nuernberg Gmbh Injection moulding machine temperature regulation
FR2386957A1 (fr) * 1977-04-07 1978-11-03 Stifelsen Inst Mikrovagste Procede et appareil pour effectuer par energie a micro-ondes un chauffage uniforme d'une matiere dans une cavite de moule
US4354812A (en) * 1980-08-20 1982-10-19 Cito Products, Inc. Method and apparatus for mold temperature control
JPS58134722A (ja) * 1982-02-05 1983-08-11 Hitachi Ltd 超音波応用射出成形方法
WO1986000563A1 (fr) * 1984-07-11 1986-01-30 Robert Bosch Gmbh Procede de surveillance et/ou de regulation du moulage par injection dans des presses d'injection

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DE1938496A1 (de) * 1969-07-29 1971-02-11 Wintergerst Prof Dr Ing Siegmu Verfahren zur Verhinderung von Orientierungen und Eigenspannungen in Spritzgussteilen aus thermoplastischen Massen beim Spritzgiessen und Vorrichtung zur Durchfuehrung des Verfahrens
US3734449A (en) * 1970-10-14 1973-05-22 Tokyo Shibaura Electric Co Metal mold for injection molding

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182389A (en) * 1937-04-29 1939-12-05 Standard Products Co Method and means for molding thermoplastic articles
US2360023A (en) * 1942-04-28 1944-10-10 Hydraulic Dev Corp Inc Control of weld lines
AT183955B (de) * 1952-11-14 1955-12-10 Heinz Faigle Verfahren und Vorrichtung zur Herstellung von Formstücken
DE1203456B (de) * 1961-01-09 1965-10-21 Licentia Gmbh Heizvorrichtung an der Spritzduese fuer thermoplastische Kunststoffe verarbeitende Spritzgiessmaschinen
DE2014306A1 (en) * 1970-03-25 1971-10-14 Anker Nuernberg Gmbh Injection moulding machine temperature regulation
FR2386957A1 (fr) * 1977-04-07 1978-11-03 Stifelsen Inst Mikrovagste Procede et appareil pour effectuer par energie a micro-ondes un chauffage uniforme d'une matiere dans une cavite de moule
US4354812A (en) * 1980-08-20 1982-10-19 Cito Products, Inc. Method and apparatus for mold temperature control
JPS58134722A (ja) * 1982-02-05 1983-08-11 Hitachi Ltd 超音波応用射出成形方法
WO1986000563A1 (fr) * 1984-07-11 1986-01-30 Robert Bosch Gmbh Procede de surveillance et/ou de regulation du moulage par injection dans des presses d'injection

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Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr, 250, (M-254) (1395) 8. November 1983, & JP, A, 58134722 (Hitachi Seisakusho K.K.) 11. August 1983, in der anmeldung erwahnt *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6224813B1 (en) * 1998-11-24 2001-05-01 Daewoo Electronics Co., Ltd. Method for controlling temperature of mold for injection molding
US6755640B2 (en) * 2001-10-31 2004-06-29 Krauss-Maffei Kunststofftechnik Gmbh Plastics injection molding machine
WO2016036549A1 (fr) * 2014-09-03 2016-03-10 iMFLUX Inc. Procédé de moulage par injection avec chauffage localisé dans des régions à écoulement difficile

Also Published As

Publication number Publication date
EP0271555A1 (fr) 1988-06-22
DE3621379A1 (de) 1988-01-21

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