GB2333739A - Method of injection moulding a foamed article - Google Patents

Method of injection moulding a foamed article

Info

Publication number
GB2333739A
GB2333739A GB9908078A GB9908078A GB2333739A GB 2333739 A GB2333739 A GB 2333739A GB 9908078 A GB9908078 A GB 9908078A GB 9908078 A GB9908078 A GB 9908078A GB 2333739 A GB2333739 A GB 2333739A
Authority
GB
United Kingdom
Prior art keywords
mould
injection
volume
plastics material
movable member
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.)
Granted
Application number
GB9908078A
Other versions
GB9908078D0 (en
GB2333739B (en
Inventor
Peter Reginald Clarke
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.)
Coraltech Ltd
Original Assignee
Coraltech 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
Priority claimed from GBGB9621193.3A external-priority patent/GB9621193D0/en
Priority claimed from GBGB9621625.4A external-priority patent/GB9621625D0/en
Priority claimed from GBGB9705952.1A external-priority patent/GB9705952D0/en
Application filed by Coraltech Ltd filed Critical Coraltech Ltd
Priority to GB9908078A priority Critical patent/GB2333739B/en
Priority claimed from PCT/GB1997/002775 external-priority patent/WO1998016364A2/en
Publication of GB9908078D0 publication Critical patent/GB9908078D0/en
Publication of GB2333739A publication Critical patent/GB2333739A/en
Application granted granted Critical
Publication of GB2333739B publication Critical patent/GB2333739B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/586—Moulds with a cavity increasing in size during foaming
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/306—Exchangeable mould parts, e.g. cassette moulds, mould inserts
    • 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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0415—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the pressure of the material during or after filling of the mould, e.g. by local venting

Landscapes

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

Abstract

A method of forming an article via injection of plastics material into a mould consisting in the steps of: providing a mould tool (11) defining in its closed state a mould cavity, the mould tool being adapted to be partially expandable from an injection volume (Fig. 2) for receiving a load of plastics material to a final, larger volume (Fig. 3) determining the finish formed shape of the article, the mould tool having at least one movable member (171, 172), which is adapted to be withdrawn to increase the volume of the mould cavity, the difference in the injection and final volumes being represented by a void exposed in the mould cavity when the movable member is withdrawn; closing the mould tool to delimit the injection volume; injecting into the injection volume a plastics material mixture comprising a basic polymer and a foam producing additive; withdrawing the movable member (171, 172) to allow the plastics material to take up the shape of the final volume; and opening the mould and ejecting the finish formed article; wherein the withdrawal is effected with substantially minimal delay on filling of the injection space, whereby rapid expansion foaming occurs into the void on the withdrawal.
GB9908078A 1996-10-11 1997-10-08 Foamed article Expired - Lifetime GB2333739B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9908078A GB2333739B (en) 1996-10-11 1997-10-08 Foamed article

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9621193.3A GB9621193D0 (en) 1996-10-11 1996-10-11 Moulded article
GBGB9621625.4A GB9621625D0 (en) 1996-10-17 1996-10-17 Moulded article
GBGB9705952.1A GB9705952D0 (en) 1997-03-21 1997-03-21 Moulded article
PCT/GB1997/002775 WO1998016364A2 (en) 1996-10-11 1997-10-08 Method of injection moulding a foamed article
GB9908078A GB2333739B (en) 1996-10-11 1997-10-08 Foamed article

Publications (3)

Publication Number Publication Date
GB9908078D0 GB9908078D0 (en) 1999-06-02
GB2333739A true GB2333739A (en) 1999-08-04
GB2333739B GB2333739B (en) 2001-03-21

Family

ID=27451533

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9908078A Expired - Lifetime GB2333739B (en) 1996-10-11 1997-10-08 Foamed article

Country Status (1)

Country Link
GB (1) GB2333739B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530289A (en) * 1948-08-25 1950-11-14 Whitney Blake Co Method for molding objects of sponge rubber and the like
US3029472A (en) * 1959-11-18 1962-04-17 Dow Chemical Co Preform injection foam molder
GB1299512A (en) * 1969-01-07 1972-12-13 British United Shoe Machinery Improvements in or relating to mould assemblies
GB1333427A (en) * 1970-12-16 1973-10-10 Gkn Sankey Ltd Moulding
GB1370075A (en) * 1972-04-20 1974-10-09 Ici Ltd Injection moulding
FR2598180A1 (en) * 1986-05-01 1987-11-06 Intevep Sa BALLPOINT VALVE, IN PARTICULAR FOR SUBMERSIBLE PUMPS USED FOR PUMPING CRUDE OIL
FR2707549A1 (en) * 1993-07-16 1995-01-20 Bertin Claude Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process
EP0657267A2 (en) * 1993-12-10 1995-06-14 General Electric Company Method for improving surface quality of foamed thermoplastic molded articles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530289A (en) * 1948-08-25 1950-11-14 Whitney Blake Co Method for molding objects of sponge rubber and the like
US3029472A (en) * 1959-11-18 1962-04-17 Dow Chemical Co Preform injection foam molder
GB1299512A (en) * 1969-01-07 1972-12-13 British United Shoe Machinery Improvements in or relating to mould assemblies
GB1333427A (en) * 1970-12-16 1973-10-10 Gkn Sankey Ltd Moulding
GB1370075A (en) * 1972-04-20 1974-10-09 Ici Ltd Injection moulding
FR2598180A1 (en) * 1986-05-01 1987-11-06 Intevep Sa BALLPOINT VALVE, IN PARTICULAR FOR SUBMERSIBLE PUMPS USED FOR PUMPING CRUDE OIL
FR2707549A1 (en) * 1993-07-16 1995-01-20 Bertin Claude Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process
EP0657267A2 (en) * 1993-12-10 1995-06-14 General Electric Company Method for improving surface quality of foamed thermoplastic molded articles

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
& Jp 57 125026 A (IKEDA BUTSUSAN KK), 4 AUGUST 1982, *
PATENT ABSTRACTS OF JAPAN vol. 006, no 220 (M169), 5 November 1982 *
see abstract; figures *

Also Published As

Publication number Publication date
GB9908078D0 (en) 1999-06-02
GB2333739B (en) 2001-03-21

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20120202 AND 20120208

PE20 Patent expired after termination of 20 years

Expiry date: 20171007