FR2433407A1 - Injection moulded thermoplastic foam component - having lower density at its core, produced in pressurised mould having delayed injection pressure - Google Patents

Injection moulded thermoplastic foam component - having lower density at its core, produced in pressurised mould having delayed injection pressure

Info

Publication number
FR2433407A1
FR2433407A1 FR7919319A FR7919319A FR2433407A1 FR 2433407 A1 FR2433407 A1 FR 2433407A1 FR 7919319 A FR7919319 A FR 7919319A FR 7919319 A FR7919319 A FR 7919319A FR 2433407 A1 FR2433407 A1 FR 2433407A1
Authority
FR
France
Prior art keywords
core
cavity
thermoplastic foam
produced
moulded thermoplastic
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
FR7919319A
Other languages
French (fr)
Other versions
FR2433407B1 (en
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.)
Asahi Dow Ltd
Original Assignee
Asahi Dow 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 JP9823378A external-priority patent/JPS5525356A/en
Priority claimed from JP16119978A external-priority patent/JPS5590334A/en
Application filed by Asahi Dow Ltd filed Critical Asahi Dow Ltd
Publication of FR2433407A1 publication Critical patent/FR2433407A1/en
Application granted granted Critical
Publication of FR2433407B1 publication Critical patent/FR2433407B1/fr
Granted 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

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

An injection moulded thermoplastic foam components has a higher S.G. at its surface than in its core, its vol. divided by the unit area of the hopper exceeds 1,500cm, or the av. flow path length fromt eh holler divided by the component thickness exceeds 50, and the component surface is free from swirl marks near the hopper and/or shows pressure delay marks indicating a sudden change. The max. speed in the polymer flow is at its core, it therefore tends to move fastest at the centre of the mould cavity and to be deflected ast the cavity wall, where foaming gas tends to diffuse out of the mass. Restricting foaming by pressurising the cavity prevents this diffusion and therefore improves the product, esp. with thisk mouldings, and it also reduces mould face corrosion. The foam mouldings are of good quality with thick skin/total thickness (pref. 4-20 mm). The process has low cost process because of pressurised cavity and correctly selected injection speed.
FR7919319A 1978-08-14 1979-07-26 Injection moulded thermoplastic foam component - having lower density at its core, produced in pressurised mould having delayed injection pressure Granted FR2433407A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9823378A JPS5525356A (en) 1978-08-14 1978-08-14 Injection molding for foam articles
JP16119978A JPS5590334A (en) 1978-12-28 1978-12-28 Molding method of foamed product

Publications (2)

Publication Number Publication Date
FR2433407A1 true FR2433407A1 (en) 1980-03-14
FR2433407B1 FR2433407B1 (en) 1983-02-25

Family

ID=26439429

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7919319A Granted FR2433407A1 (en) 1978-08-14 1979-07-26 Injection moulded thermoplastic foam component - having lower density at its core, produced in pressurised mould having delayed injection pressure

Country Status (2)

Country Link
DE (1) DE2931461A1 (en)
FR (1) FR2433407A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645068A1 (en) * 1989-04-03 1990-10-05 Vanotti Gerard PROCESS FOR MANUFACTURING THERMOPLASTIC MATERIALS WITH THIN WALLS AND INSTALLATION FOR IMPLEMENTING THE PROCESS
EP0895847A2 (en) * 1997-08-08 1999-02-10 Friedrich Priehs Method and mould for the manufacturing of articles from biopolymers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6884823B1 (en) 1997-01-16 2005-04-26 Trexel, Inc. Injection molding of polymeric material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1576083A (en) * 1967-08-12 1969-07-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1576083A (en) * 1967-08-12 1969-07-25

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/78 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645068A1 (en) * 1989-04-03 1990-10-05 Vanotti Gerard PROCESS FOR MANUFACTURING THERMOPLASTIC MATERIALS WITH THIN WALLS AND INSTALLATION FOR IMPLEMENTING THE PROCESS
EP0391854A1 (en) * 1989-04-03 1990-10-10 Vanotti, Gérard Method for producing thin-walled thermoplastic articles and apparatus for carrying out the method
EP0895847A2 (en) * 1997-08-08 1999-02-10 Friedrich Priehs Method and mould for the manufacturing of articles from biopolymers
EP0895847A3 (en) * 1997-08-08 1999-07-07 Friedrich Priehs Method and mould for the manufacturing of articles from biopolymers

Also Published As

Publication number Publication date
FR2433407B1 (en) 1983-02-25
DE2931461A1 (en) 1980-02-28

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Legal Events

Date Code Title Description
ST Notification of lapse