GB1370075A - Injection moulding - Google Patents

Injection moulding

Info

Publication number
GB1370075A
GB1370075A GB1837872A GB1837872A GB1370075A GB 1370075 A GB1370075 A GB 1370075A GB 1837872 A GB1837872 A GB 1837872A GB 1837872 A GB1837872 A GB 1837872A GB 1370075 A GB1370075 A GB 1370075A
Authority
GB
United Kingdom
Prior art keywords
mould
skin
moulding
injection
retracted
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1837872A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB1837872A priority Critical patent/GB1370075A/en
Priority to US922007D priority patent/UST922007I4/en
Priority to DE19732320098 priority patent/DE2320098A1/en
Publication of GB1370075A publication Critical patent/GB1370075A/en
Expired legal-status Critical Current

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
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • B29C44/083—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another
    • B29C44/086—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another and feeding more material into the enlarged cavity
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

1370075 Injection moulding IMPERIAL CHEMICAL INDUSTRIES Ltd 2 April 1973 [20 April 1972] 18378/72 Heading B5A In a "sandwich moulding" process at least one of the mould members comprises a slidably mounted retractable component 5 which is in the non-retracted position (Fig. 2) during injection of the skin material, but is retracted before or during injection of the core material, but before the mould cavity is filled (Fig. 4, not shown). In one example (Figs. 1-4) the mould is for making a 3-bladed fan and the invention reduces the disparity in skin thickness at the hub periphery 3 and the blade extremity 4. Figure 5 shows a mould 10, 11 for making a shoe sole and comprising two retractable mould members 12, 13 adjacent the heel portion 14. On injection of a foamable core material (18) the members 12, 13 are retracted. The result is a thicker skin in the toe portion than in the heel portion. A further small charge (19) of skin material may be injected and the mould members 10-13 moved apart to permit the core material to foam. Figure 8 shows a female mould member 21 provided with a central sprue 22 and a pair of retractable bars 23 which are in contact with an opposed male mould member (24) Fig. 9 (not shown) during injection of skin material. After retraction, the bars 23 lie flush with the surface of the mould member 21. The result is an even distribution of skin material in the final moulding. In a further' example (not shown) the retractable mould components are flush with the mould surface in their non-retracted position so that in the retracted position the flow path is widened. A protruding component may be retracted more than or less than is necessary to make it flush thereby producing protrusions or depressions in the final moulding. Separate sprue channels for the skin and core materials may be used. Numerous examples of suitable thermoplastic and thermosetting moulding materials are given. Instead of enlarging the mould cavity to permit foaming the pressure on the core material may be reduced by retracting the injection ram.
GB1837872A 1972-04-20 1972-04-20 Injection moulding Expired GB1370075A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1837872A GB1370075A (en) 1972-04-20 1972-04-20 Injection moulding
US922007D UST922007I4 (en) 1972-04-20 1973-04-05 Injection moulding
DE19732320098 DE2320098A1 (en) 1972-04-20 1973-04-19 INJECTION MOLDING PROCESS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1837872A GB1370075A (en) 1972-04-20 1972-04-20 Injection moulding

Publications (1)

Publication Number Publication Date
GB1370075A true GB1370075A (en) 1974-10-09

Family

ID=10111442

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1837872A Expired GB1370075A (en) 1972-04-20 1972-04-20 Injection moulding

Country Status (2)

Country Link
DE (1) DE2320098A1 (en)
GB (1) GB1370075A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124542A (en) * 1982-07-05 1984-02-22 Cibie Projecteurs Injection moulding composite article
WO1998016364A2 (en) * 1996-10-11 1998-04-23 Coraltech Limited Method of injection moulding a foamed article
GB2333739A (en) * 1996-10-11 1999-08-04 Coraltech Ltd Method of injection moulding a foamed article
FR2874350A1 (en) * 2004-08-18 2006-02-24 Faurecia Interieur Ind Societe MOLD FOR INJECTION MOLDING OF A PLASTIC PIECE AND MOLDING METHOD
EP2735417A1 (en) * 2012-11-27 2014-05-28 Wittmann Battenfeld GmbH Method for injection moulding plastic parts made of thermoplastic

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES455627A1 (en) * 1977-01-26 1978-01-01 Mares Ibanez Pedro Process and apparatus for forming compound structure of various plastic materials in mold having apertured slide plate
FR2579128B3 (en) * 1985-03-25 1987-07-10 Cibie Projecteurs PROCESS FOR PRODUCING A REFLECTOR FOR A PROJECTOR, PARTICULARLY FOR A MOTOR VEHICLE, BY MOLDING-TWO-MATERIAL INJECTION; MOLD FOR IMPLEMENTING THIS PROCESS AND PRODUCT OBTAINED
DE4414258C2 (en) * 1994-04-23 1996-07-25 Battenfeld Gmbh Process for injection molding objects consisting of at least two different layers
DE4422739A1 (en) * 1994-06-29 1996-01-04 Teves Gmbh Alfred Method for thin-walled encapsulation of an electronic circuit that is precisely aligned with the encapsulated wall, and electronic circuit for this
WO1999010157A1 (en) * 1997-08-21 1999-03-04 Structoform Spritzgiessen Anisotroper Strukturkomponenten Gmbh Method and device for injection moulding plastifiable parts
EP2039491A1 (en) * 2007-09-19 2009-03-25 ifm Manfred Otte GmbH Method of inserting the seal of a connector part
DE102015208036A1 (en) 2014-05-02 2015-11-05 Toshiba Kikai Kabushiki Kaisha Shaping device, molding method and molded products
DE102014113615B4 (en) 2014-09-22 2018-09-20 Hanon Systems Flap for an air conditioner

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124542A (en) * 1982-07-05 1984-02-22 Cibie Projecteurs Injection moulding composite article
US4459257A (en) * 1982-07-05 1984-07-10 Cibie Projecteurs Process for producing a shaped article by injection moulding
WO1998016364A2 (en) * 1996-10-11 1998-04-23 Coraltech Limited Method of injection moulding a foamed article
WO1998016364A3 (en) * 1996-10-11 1998-06-18 Coraltech Ltd Method of injection moulding a foamed article
GB2333739A (en) * 1996-10-11 1999-08-04 Coraltech Ltd Method of injection moulding a foamed article
GB2333739B (en) * 1996-10-11 2001-03-21 Coraltech Ltd Foamed article
US6358446B1 (en) 1996-10-11 2002-03-19 Coraltech Limited Method of injection moulding a foamed article
FR2874350A1 (en) * 2004-08-18 2006-02-24 Faurecia Interieur Ind Societe MOLD FOR INJECTION MOLDING OF A PLASTIC PIECE AND MOLDING METHOD
WO2006021697A1 (en) * 2004-08-18 2006-03-02 Faurecia Interieur Industrie Mould for the injection moulding of a plastic piece and moulding method
EP2735417A1 (en) * 2012-11-27 2014-05-28 Wittmann Battenfeld GmbH Method for injection moulding plastic parts made of thermoplastic

Also Published As

Publication number Publication date
DE2320098A1 (en) 1973-11-08

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Legal Events

Date Code Title Description
PS Patent sealed
426 Order made revoking patent and granting patent of addition in lieu thereof (sect. 26(2)/1949)