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WO2009049435A1 - Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé - Google Patents

Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé Download PDF

Info

Publication number
WO2009049435A1
WO2009049435A1 PCT/CH2008/000411 CH2008000411W WO2009049435A1 WO 2009049435 A1 WO2009049435 A1 WO 2009049435A1 CH 2008000411 W CH2008000411 W CH 2008000411W WO 2009049435 A1 WO2009049435 A1 WO 2009049435A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
cavity
slide
nozzle
mold part
Prior art date
Application number
PCT/CH2008/000411
Other languages
German (de)
English (en)
Inventor
Andreas Hegner
Arpad Kelemen
Original Assignee
Weidmann Plastics Technology Ag
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 Weidmann Plastics Technology Ag filed Critical Weidmann Plastics Technology Ag
Publication of WO2009049435A1 publication Critical patent/WO2009049435A1/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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B29C45/1639—Removable partitions between adjacent mould cavity portions
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for producing multicomponent and especially two-component plastic parts in an injection molding tool comprising at least a first mold part and a second mold part, at least one first nozzle for injecting a first plastic into a first cavity formed between the at least two mold parts and at least one second nozzle for injecting a second plastic into a second cavity, which second cavity is formed by adjusting at least one slide, wherein after the injection of the first plastic resulting from this plastic part remains in the closed mold and the second plastic is molded onto this plastic part.
  • a method of this type has become known in the art from DE-A-4224171.
  • an injection-molded part in the form of a plug can be produced, which has a base body with downwardly facing walls, at the lower ends of a seal is molded.
  • the main body is sprayed with a first plastic and the seal with a second plastic.
  • the cavity or the cavity for the seal is produced by pulling back a slider.
  • the supply of the second plastic to said cavity via channels in the first mold part.
  • EP-A-0 338 398 discloses a method in which a plastic is injected into a cavity of a mold part.
  • a second cavity is formed, into which a second plastic is injected.
  • the second plastic is harder after curing than the first plastic. In this method, there is the difficulty that the first plastic is strongly compressed during injection of the second and harder plastic and thus can be deformed.
  • the invention is based on the object to provide a method of this type, in which the difficulties mentioned are avoided.
  • the object is achieved according to claim 1, characterized in that the second plastic is injected through the slide into the second cavity.
  • plastic parts can be molded substantially at any point of a body. For example, it is possible to form a groove with the slider and to inject the second plastic into this groove.
  • the second plastic is softer after curing than the first plastic. This has the particular advantage that the softer component is not compressed and deformed. This is particularly advantageous when the second component is a seal. This ensures the sealing effect.
  • the first nozzle in the first mold part and the slider is arranged in the second mold part and according to the first plastic is injected through the first mold part and the second plastic through the slide arranged in the second mold part.
  • the thermal separation of the nozzles and the feed channels allows a much simpler design.
  • the supply of the two components requires less space.
  • the second plastic is for example a thermoset, for example Einkomponentenpolyurethan.
  • a thermoset is a material which increases the molecular weight by the application of heat and thereby hardens.
  • the slide in the region of the nozzle orifice has a temperature that cures the thermosetting plastic in the region of the nozzle orifice.
  • the slider is preferably heated, at least in the region of the nozzle orifice.
  • this area is coolable.
  • a plastic part can be produced which has no part which would have to be removed with a post-processing.
  • the feed channels in the slide itself would not have to be tempered.
  • the second cavity is formed exclusively by said adjustment of the slide.
  • a groove is formed for the second plastic.
  • the first mold part is fixed and the second mold part is mobile for demolding.
  • the slider is arranged in the movable mold part.
  • the slider can be mechanically operated by the injection molding machine. If the slide were contained in the non-movable mold part, then in the non-movable part for actuating the slide, e.g. a hydraulic cylinder can be installed.
  • the first plastic is then injected through the solid mold part.
  • foaming plastic such as e.g. Einkomponentenpolyurethan.
  • Such a plastic can be injected, for example, already at a temperature of 60 ° Celsius. For example, such a plastic cures at a temperature above 70 ° Celsius.
  • the second plastic is a foaming plastic during injection.
  • the plastic is in particular a plastic based on polyurethane or silicone. Such plastics are particularly suitable for producing seals.
  • the second plastic is an adhesive.
  • the method is suitable according to this development, in particular for the manufacture of components that are available by gluing.
  • the mouth of the second nozzle is preferably coated internally with an anti-adhesive.
  • the inside of the cavity can also be coated.
  • the invention also relates to an injection molding tool for carrying out the method.
  • This is characterized in that the at least one slide has at least one passage for injecting the second plastic.
  • Such an injection molding tool requires no additional material feeds for the second plastic and is much more flexible ie the second plastic can be injected at any point to the injected first plastic.
  • said at least one passage forms the at least one nozzle.
  • the slider can then be made particularly easy. It is also advantageous that a separate nozzle body can be avoided, and that the second plastic can be molded substantially at any point of a body.
  • the slider is according to an embodiment of the invention, a round or non-circular ring.
  • the slide engages in the first cavity so that after the adjustment of the slide, the second cavity forms a groove in the cured first plastic.
  • Such an injection molding tool is particularly suitable for producing a seal in a base body, which is for example a cover.
  • the invention also relates to a plastic part produced by the said method.
  • This has a base body with a groove, in which a plastic is injected, which is softer than the plastic of the body. Since the soft plastic is injected into a groove, this is comparatively firmly connected to the main body, without separate fastening means would be required. This is particularly advantageous if, according to a development of the invention, the part injected into the groove forms a seal.
  • FIG. 1 shows schematically a section through an injection molding tool according to the invention
  • FIG. 2 shows a section according to FIG. 1, however, after the injection of the second plastic
  • FIG. 3 schematically a perspective view of a plastic part produced by the inventive method and FIG. 4 shows a cut-off part of the plastic part according to FIG. 3.
  • the injection molding tool 1 shown in Figures 1 and 2 has a first mold part 2 and a second mold part 3. Between these two mold parts 2 and 3, a first cavity 7 is formed. In this cavity 7, a thermoplastic material is injected through a nozzle 15, which forms a component 8 in a plastic part 10 according to Figures 3 and 4.
  • This component 8 consists of a comparatively hard plastic, for example polyethylene or polypropylene.
  • the first mold part 2 is preferably solid, that is to say it is not used for removing the plastic part 10.
  • the second mold part 3 bears against a parting surface 6 on the first mold part 2 and forms with it said cavity 7.
  • the second mold part 3 can be moved in a manner known per se so that it moves away from the fixed mold part 2 along the parting surface 6 .
  • the second mold part 3 has a plate-shaped part 17, between which and the mold part 2 parts 18 and 19 are arranged.
  • the central part 19 forms a wall to said cavity 17 and is provided with an annular recess 16 in which a likewise annular slide 5 is slidably mounted.
  • the slide 5 has at least one and preferably a plurality of channels 14, to each of which a nozzle 12 is closed at. Through these nozzle 12, the channels 14 and via this in each case a nozzle 13, a plastic can be supplied.
  • the nozzle 12 are connected in a conventional manner to an injection molding extruder, not shown here.
  • the nozzles 13 are preferably needle valve nozzles and each have a needle 4, which are displaceable between the position shown in Figure 1 and the position shown in Figure 2 with a drive means not shown here.
  • the nozzles 13 are closed and opened in the position according to FIG.
  • the temperature is adjusted so that the plastic does not harden in this channel 14.
  • the temperature is adjusted so that the plastic cures here.
  • the temperature can be adjusted for example with cooling holes and water.
  • the slider 5 has a front edge 20, which protrudes into the cavity 7 according to FIG. This edge 20 is overmolded during the injection of the first component 8, as shown in FIG. If the first component 8 has substantially hardened and the slide 5 is displaced into the position shown in FIG. 2, the edge 20 is located outside the cavity 7. Due to the withdrawal of the edge 20 from the cavity 7, a second cavity 21 forms ( Figure 2). This second cavity 21 has a shape that is formed corresponding to the edge 20. The displacement of the slider 5 between said positions is carried out with a drive, not shown here. The end positions can be defined by stops or by the drive. The slider 5 is thus connected directly to the nozzle 12, so that only very short channels 14 are necessary for the supply of the second plastic.
  • the slider 5 may have a plurality of second nozzles 13 and these may be operated independently.
  • the nozzles 13 are each closed by a needle 4.
  • the nozzles 13 are opened by a system (not shown) that is independent of the locking slide and in each case connected to a comparatively short channel 14.
  • plastic can thus be injected into the cavity 21 in this position of the slide 5.
  • the corresponding plastic is in this case molded onto the component 8.
  • the cavity 21 is thus completely filled by the injected plastic.
  • this plastic is preferably a softer plastic than that of the first component 8.
  • this second plastic is one which foams in the second cavity 21 and hardens upon heating.
  • Such plastics are known in particular based on polyurethane or silicone. For example, this plastic is injected at a temperature of 60 ° Celsius and then cured at 100 - 120 ° Celsius.
  • the cured second component 9 forms in the embodiment shown, for example, a seal. According to FIG. 4, this protrudes somewhat beyond the outer surface of the first component 8, but is located for the most part within a groove 11, as FIG. 4 shows. In the groove 11, this second component 9 is molded onto the first component 8 and thus connected thereto.
  • the second component 9 is circular in accordance with FIG. 3, but it may also have a non-round shape, for example oval or angular. However, other shapes are possible here as well, for example, the second component 9 may also be punctiform or have another shape or structure per se.
  • At the first component 8 also several and also different second components 9 can be molded. These are not necessarily arranged in a groove 11 or a recess. They can also be injected superficially.
  • the second component 9 may also have a function other than a seal.
  • the second component 9 could be an adhesive which is injection-molded onto the first component.
  • Such an adhesive may serve, for example, the first Component 8 to attach to an object.
  • the plastic part 10 may for example be a component which can be fastened by gluing during assembly.
  • the plastic part 10 is removed from the mold.
  • the second mold part 3 is moved in the figure 2 down.
  • the plastic part 10 can then be ejected in a conventional manner.
  • the injection molding tool 1 is then closed, so that now another plastic part 10 can be formed by injecting the first component 8 and then injecting the second component 9.
  • the second plastic may be a sticky system.
  • the second plastic is, for example, a pressure-sensitive adhesive, for example an acrylate.
  • the mouth of the second nozzle 13 is provided with a non-stick coating.
  • This coating is for example one based on a fluoropolymer such as PTFE (polytetrafluoroethylene) or another fluorinated plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un outil de moulage par injection (1) utilisé pour produire des pièces en plastique à plusieurs éléments et, en particulier, à deux éléments. L'outil selon l'invention comprend une première partie de moule (2) et une deuxième partie de moule (3), au moins une première buse (15) pour l'injection d'une première matière plastique dans une première cavité (7) formée par les deux parties de moule, ainsi qu'une deuxième buse (13) pour l'injection d'une deuxième matière plastique dans une deuxième cavité (21). La deuxième cavité (21) est formée par déplacement d'un coulisseau (5), la pièce en plastique (8) produite après l'injection de la première matière plastique restant dans le moule fermé et la deuxième matière plastique étant surmoulée sur cette pièce en plastique (8). Après durcissement, la pièce en plastique surmoulée (9) est de préférence moins dure que la première pièce en plastique durcie (8). Selon l'invention, la deuxième matière plastique est injectée dans la deuxième cavité (21) à travers le coulisseau (5). La première buse (15) est placée de préférence dans la première partie de moule (2) et le coulisseau (5) dans la deuxième partie de moule (3). En conséquence, la première matière plastique est injectée à travers la première partie de moule (2) et la deuxième matière plastique à travers le coulisseau (5) placé dans la deuxième partie de moule (3).
PCT/CH2008/000411 2007-10-19 2008-10-03 Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé WO2009049435A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1635/07 2007-10-19
CH16352007 2007-10-19

Publications (1)

Publication Number Publication Date
WO2009049435A1 true WO2009049435A1 (fr) 2009-04-23

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ID=40134768

Family Applications (1)

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PCT/CH2008/000411 WO2009049435A1 (fr) 2007-10-19 2008-10-03 Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé

Country Status (2)

Country Link
DE (1) DE102008046840A1 (fr)
WO (1) WO2009049435A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9635928B2 (en) 2012-11-05 2017-05-02 The Procter & Gamble Company Toothbrush comprising elastomeric cleaning elements over-molded with a harder plastic and method for producing the same
US10759332B2 (en) 2016-01-14 2020-09-01 Weidplas Gmbh Component comprising a flat decorative element and housing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009013165A1 (de) * 2009-03-13 2010-09-23 Daimler Ag Verfahren zur Herstellung eines eine Beschichtung aufweisenden Kunststoffbauteils
DE102014101143A1 (de) * 2014-01-30 2015-07-30 Halla Visteon Climate Control Corporation Verfahren zur Herstellung eines Radiator- oder Ladeluftkühlerkastens
CN112388908B (zh) * 2020-10-19 2022-06-21 宁波方正汽车模具股份有限公司 一种双色模短刀口注塑结构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196988A1 (fr) * 1985-03-22 1986-10-08 Cartier Industrie Moule pour la production de pièces composites
JPS62108019A (ja) * 1985-11-07 1987-05-19 Yoshida Kogyo Kk <Ykk> 合成樹脂多色成形品の成形方法並びに成形装置及びその成形品
JPH0631770A (ja) * 1992-07-22 1994-02-08 Hitachi Ltd シール構造部付き筐体、成形用金型及びそれを用いた製造方法
WO1997038840A1 (fr) * 1996-04-18 1997-10-23 J & W Sanderson Limited Moulage de deux materiaux
JPH10264202A (ja) * 1997-03-25 1998-10-06 Uchihama Kasei Kk 複合合成樹脂成形品の製造方法
JPH10278076A (ja) * 1997-04-03 1998-10-20 Yazaki Kako Kk 複合成形の射出成形用金型
EP1338399A1 (fr) * 2002-02-20 2003-08-27 Demag Ergotech GmbH Objet moulé par injection de plusieurs matières, et dispositif et procédé pour sa fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224171A1 (de) 1992-07-22 1994-01-27 Bosch Gmbh Robert Spritzgußteil sowie Verfahren und Spritzgießwerkzeug zum Herstellen von Spritzgußteilen
DE10207065A1 (de) 2002-02-20 2003-08-21 Demag Ergotech Gmbh Vorrichtung zum Herstellen von mehrkomponentigen Kunststoffformteilen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196988A1 (fr) * 1985-03-22 1986-10-08 Cartier Industrie Moule pour la production de pièces composites
JPS62108019A (ja) * 1985-11-07 1987-05-19 Yoshida Kogyo Kk <Ykk> 合成樹脂多色成形品の成形方法並びに成形装置及びその成形品
JPH0631770A (ja) * 1992-07-22 1994-02-08 Hitachi Ltd シール構造部付き筐体、成形用金型及びそれを用いた製造方法
WO1997038840A1 (fr) * 1996-04-18 1997-10-23 J & W Sanderson Limited Moulage de deux materiaux
JPH10264202A (ja) * 1997-03-25 1998-10-06 Uchihama Kasei Kk 複合合成樹脂成形品の製造方法
JPH10278076A (ja) * 1997-04-03 1998-10-20 Yazaki Kako Kk 複合成形の射出成形用金型
EP1338399A1 (fr) * 2002-02-20 2003-08-27 Demag Ergotech GmbH Objet moulé par injection de plusieurs matières, et dispositif et procédé pour sa fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9635928B2 (en) 2012-11-05 2017-05-02 The Procter & Gamble Company Toothbrush comprising elastomeric cleaning elements over-molded with a harder plastic and method for producing the same
US10759332B2 (en) 2016-01-14 2020-09-01 Weidplas Gmbh Component comprising a flat decorative element and housing

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Publication number Publication date
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