GB2340788A - Injection moulding of thermoplastic polymers - Google Patents

Injection moulding of thermoplastic polymers

Info

Publication number
GB2340788A
GB2340788A GB9928063A GB9928063A GB2340788A GB 2340788 A GB2340788 A GB 2340788A GB 9928063 A GB9928063 A GB 9928063A GB 9928063 A GB9928063 A GB 9928063A GB 2340788 A GB2340788 A GB 2340788A
Authority
GB
United Kingdom
Prior art keywords
cavity
tool
movable
thermoplastic polymer
parts
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.)
Withdrawn
Application number
GB9928063A
Other versions
GB9928063D0 (en
Inventor
Ath Roderick Michael De
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.)
Kontor Moulding Systems Ltd
Original Assignee
Kontor Moulding Systems 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 Kontor Moulding Systems Ltd filed Critical Kontor Moulding Systems Ltd
Publication of GB9928063D0 publication Critical patent/GB9928063D0/en
Publication of GB2340788A publication Critical patent/GB2340788A/en
Withdrawn legal-status Critical Current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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/563—Enlarging the mould cavity during injection
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/5635—Mould integrated compression drive means
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/5645—Resilient compression means

Landscapes

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

Abstract

A method of injection moulding which consists in injecting molten thermoplastic polymer material into a cavity having walls defined by at least two separable mould parts, allowing the thermoplastic polymer material to cool and solidify in the cavity in a cooling phase, separating the mould parts and extracting the solidified material characterized in that one of the mould parts is capable of movement relative to the other mould parts with which it defines the walls of the said cavity and in a direction away from and towards the cavity and in that the injecttion of molten thermoplastic polymer material is continued until the movable mould part is caused to move to a position away from the cavity by pressure created in the cavity by the injection thereinto of thermoplastic polymer material and wherein as the thermoplastic polymer material in the cavity undergoes shrinkage on cooling the movable mould part is caused to move towards the cavity thus maintaining contact with the injected material in the cavity. The method makes use of a moulding tool comprising at least one cavity (3) defined by at least two separable tool parts (4, 5) characterized in that one of the tool parts (5) is movable relative to the other tool parts with which it defines the cavity (3) and in a direction away from and towards the cavity (3) and in that the moulding tool also comprises resilient urging means (9) which exert pressure on the movable tool part to urge the said part (5) towards the cavity (3), the movable tool part (5) being movable away from the cavity (3), during operation of the moulding tool, by pressure created in the cavity (3) by the continued injection thereinto of molten polymer after the filling of the cavity (3).
GB9928063A 1997-05-30 1998-05-29 Injection moulding of thermoplastic polymers Withdrawn GB2340788A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9711048.0A GB9711048D0 (en) 1997-05-30 1997-05-30 Injection moulding of thermoplastic polymer
PCT/GB1998/001590 WO1998053975A1 (en) 1997-05-30 1998-05-29 Injection moulding of thermoplastic polymers

Publications (2)

Publication Number Publication Date
GB9928063D0 GB9928063D0 (en) 2000-01-26
GB2340788A true GB2340788A (en) 2000-03-01

Family

ID=10813205

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9711048.0A Pending GB9711048D0 (en) 1997-05-30 1997-05-30 Injection moulding of thermoplastic polymer
GB9928063A Withdrawn GB2340788A (en) 1997-05-30 1998-05-29 Injection moulding of thermoplastic polymers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9711048.0A Pending GB9711048D0 (en) 1997-05-30 1997-05-30 Injection moulding of thermoplastic polymer

Country Status (3)

Country Link
AU (1) AU7668498A (en)
GB (2) GB9711048D0 (en)
WO (1) WO1998053975A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10066272B4 (en) * 2000-10-02 2009-01-29 Kraussmaffei Technologies Gmbh Method and device for producing thick-walled molded parts
DE10141858B4 (en) 2001-08-27 2010-06-17 Kraussmaffei Technologies Gmbh Method and device for producing sheet-like plastic molded parts, in particular plastic discs
DE10207080A1 (en) * 2002-02-20 2003-08-28 Krauss Maffei Kunststofftech Shaping a molded component with large surface dimensions, by in-mold coating, uses mold closing and opening actions to spread out the mat followed by injection of the coating mass for spreading out by the mold sections
US7763191B2 (en) * 2005-05-27 2010-07-27 Gentex Optics, Inc. Method and apparatus for performing an in-mold coining operation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443826A (en) * 1944-06-23 1948-06-22 Combined Optical Ind Ltd Apparatus for the manufacture of lenses
US2781547A (en) * 1951-12-26 1957-02-19 Honeywell Regulator Co Molding procedure and apparatus
GB2050928A (en) * 1979-05-23 1981-01-14 Omnitech Inc Method and apparatus for molding ophthalmic lenses without spoilation
WO1990014207A1 (en) * 1989-05-18 1990-11-29 Maus Steven M Plastic injection molding via adaptive mold process
DE4442536A1 (en) * 1994-03-11 1995-09-14 Bayer Ag Method and device for producing molded parts from multi-component plastics

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS588622A (en) * 1981-07-08 1983-01-18 Hitachi Ltd Molding of precise plastics parts
JPS63114614A (en) * 1986-04-14 1988-05-19 Olympus Optical Co Ltd Injection mold
JPS63160813A (en) * 1986-12-25 1988-07-04 Olympus Optical Co Ltd Injection mold
JPH0416319A (en) * 1990-05-10 1992-01-21 Osamu Hamada Molding die assembly
JP3253991B2 (en) * 1991-10-24 2002-02-04 旭化成株式会社 Injection molding method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443826A (en) * 1944-06-23 1948-06-22 Combined Optical Ind Ltd Apparatus for the manufacture of lenses
US2781547A (en) * 1951-12-26 1957-02-19 Honeywell Regulator Co Molding procedure and apparatus
GB2050928A (en) * 1979-05-23 1981-01-14 Omnitech Inc Method and apparatus for molding ophthalmic lenses without spoilation
WO1990014207A1 (en) * 1989-05-18 1990-11-29 Maus Steven M Plastic injection molding via adaptive mold process
DE4442536A1 (en) * 1994-03-11 1995-09-14 Bayer Ag Method and device for producing molded parts from multi-component plastics

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol.17 no479 (M-1471) 31 August 93(ASAHI CHEM IND CO LTD)14 May 93 *
Vol.16no173 (M-1240)24 April 92 (OSAMU HAMADA)21 Jan 92.Vo12no424(M-761)0Nov 88 (OLYMPUS OPTICAL CO) *
vol7no12no356(M-745)(olympus Optical co Ltd,vol7 no 81(M-2055 APRIL 83 (HITACHI SEISAKUSHO) *

Also Published As

Publication number Publication date
GB9711048D0 (en) 1997-07-23
AU7668498A (en) 1998-12-30
WO1998053975A1 (en) 1998-12-03
GB9928063D0 (en) 2000-01-26

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)