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GB1372959A - Injection moulding method - Google Patents

Injection moulding method

Info

Publication number
GB1372959A
GB1372959A GB4827572A GB4827572A GB1372959A GB 1372959 A GB1372959 A GB 1372959A GB 4827572 A GB4827572 A GB 4827572A GB 4827572 A GB4827572 A GB 4827572A GB 1372959 A GB1372959 A GB 1372959A
Authority
GB
United Kingdom
Prior art keywords
pressure
chamber
gas
mould
melt
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
GB4827572A
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.)
TZENTRALNA LAB STEX
Original Assignee
TZENTRALNA LAB STEX
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 TZENTRALNA LAB STEX filed Critical TZENTRALNA LAB STEX
Publication of GB1372959A publication Critical patent/GB1372959A/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
    • 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
    • B29C44/10—Applying counter-pressure during expanding
    • B29C44/105—Applying counter-pressure during expanding the counterpressure being exerted by a fluid
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/174—Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould

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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1372959 Injection moulding TZENTRALNA LABORATOBIA STEX 19 Oct 1972 [23 Oct 1971] 48275/72 Heading B5A An article is moulded by injecting a thermoplastic or thermosetting polymer melt into a mould chamber 7 containing gas under pressure, effecting soldification of the melt while subjecting it to a higher gas pressure in the mould, and admitting further melt into the mould while under the increased pressure to compensate for shrinkage during solidification. The melt is injected by an axially reciprocating screw (Fig. 1, not shown) or a ram 3 fed by a screw device 2 into a mould chamber 7 having semi-rigid walls and communicating via ducts 9 with a gas chamber 8. Alternatively (not shown) the gas chamber may be an unfilled portion of the mould chamber. Cavity 8 is made gas tight by a seal 10 and is connected to a container R of compressed air or nitrogen by way of a valve 5 which determines the two pressure levels used. The pressure in chamber 8 helps to stiffen the semi-rigid inner walls and removal of this stiffening pressure by closing valve 5 and opening vent valve 6 aids removal of the moulded article. The polymer may be polyethylene or polyformaldehyde. Gas and injection pressures are given.
GB4827572A 1971-10-23 1972-10-19 Injection moulding method Expired GB1372959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG1884971 1971-10-23

Publications (1)

Publication Number Publication Date
GB1372959A true GB1372959A (en) 1974-11-06

Family

ID=3898153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4827572A Expired GB1372959A (en) 1971-10-23 1972-10-19 Injection moulding method

Country Status (8)

Country Link
JP (1) JPS4851057A (en)
AT (1) AT338504B (en)
BE (1) BE786969A (en)
DE (1) DE2235994A1 (en)
FR (1) FR2156558B1 (en)
GB (1) GB1372959A (en)
IT (1) IT965932B (en)
NL (1) NL7214227A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5602188A (en) * 1993-07-13 1997-02-11 Suzuki Sogyo Co., Ltd. Biodegradable resin foam and method and apparatus for producing same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH616106A5 (en) * 1976-09-17 1980-03-14 Buehler Ag Geb Process and device for producing plastic mouldings with a smooth, compact surface and a cellular-porous core by injection moulding
FR2645068A1 (en) * 1989-04-03 1990-10-05 Vanotti Gerard PROCESS FOR MANUFACTURING THERMOPLASTIC MATERIALS WITH THIN WALLS AND INSTALLATION FOR IMPLEMENTING THE PROCESS
GB9114324D0 (en) * 1991-07-03 1991-08-21 Kontor Moulding Systems Ltd Injection moulding of thermoplastic polymers
DE19743838C2 (en) 1997-10-04 2000-08-24 Battenfeld Gmbh Device for injection molding plastic objects
WO2020106648A1 (en) 2018-11-21 2020-05-28 Nike, Inc. System and methods for forming a sole structure
CN113165231A (en) * 2018-11-21 2021-07-23 耐克创新有限合伙公司 System and method for foaming process

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044118A (en) * 1958-06-23 1962-07-17 Du Pont Molding method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5602188A (en) * 1993-07-13 1997-02-11 Suzuki Sogyo Co., Ltd. Biodegradable resin foam and method and apparatus for producing same
US5849339A (en) * 1993-07-13 1998-12-15 Suzuki Sogyo Co., Ltd. Apparatus for producing biodegradable resin foam
US6228898B1 (en) 1993-07-13 2001-05-08 Suzuki Sogyo, Co., Ltd. Biodegradable resin foam and method and apparatus for producing same
US6626654B1 (en) 1993-07-13 2003-09-30 Suzuki Sogyo Co., Ltd. Biodegradable resin foam and method and apparatus for producing same

Also Published As

Publication number Publication date
BE786969A (en) 1972-11-16
FR2156558B1 (en) 1975-03-07
IT965932B (en) 1974-02-11
ATA893972A (en) 1976-12-15
FR2156558A1 (en) 1973-06-01
JPS4851057A (en) 1973-07-18
NL7214227A (en) 1973-04-25
AT338504B (en) 1977-08-25
DE2235994A1 (en) 1973-05-03

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Legal Events

Date Code Title Description
PS Patent sealed
429A Application made for amendment of specification (sect. 29/1949)
429C Application to amend the specification withdrawn (sect. 29/1949)
PCNP Patent ceased through non-payment of renewal fee