MY132152A - Method for controlling skin thickness of plastic article made with controlled density - Google Patents

Method for controlling skin thickness of plastic article made with controlled density

Info

Publication number
MY132152A
MY132152A MYPI96000854A MYPI9600854A MY132152A MY 132152 A MY132152 A MY 132152A MY PI96000854 A MYPI96000854 A MY PI96000854A MY PI9600854 A MYPI9600854 A MY PI9600854A MY 132152 A MY132152 A MY 132152A
Authority
MY
Malaysia
Prior art keywords
plastic article
mold cavity
cavity
mixture
interior
Prior art date
Application number
MYPI96000854A
Inventor
Siebolt Hettinga
Original Assignee
Siebolt Hettinga
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 Siebolt Hettinga filed Critical Siebolt Hettinga
Publication of MY132152A publication Critical patent/MY132152A/en

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
    • 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

Abstract

A METHOD OF MOLDING A PLASTIC ARTICLE WITH A FOAMED INTERIOR AND A DENSE OUTER SKIN OF A DESIRED THICKNESS, WHEREBY A BLOWING AGENT IS MIXED WITH A PLASTIC MATERIAL AND THE MIXTURE IS INJECTED, UNDER PRESSURE, INTO A MOLD CAVITY OF A MOLD UNIT. THE MIXTURE IS ALLOWED TO COOL ALONG THE MOLDING SURFACES OF THE MOLD CAVITY FOR A DETERMINED AMOUNT OF TIME. THE PRESSURE IS RELEASED AND THE MOLD CAVITY EXPANDED TO ALLOW THE BLOWING AGENT TO FOAM THE INTERIOR OF THE PLASTIC ARTICLE. THE MOLDING CAVITY IS THEN COMPRESSED TO ACHIEVE THE DESIRED DIMENSIONS FOR THE PLASTIC ARTICLE, AND TO GIVE THE INTERIOR A UNIFORM CELLULAR STRUCTURE. CONTROL OVER THE TIMING OF THE EXPANSION OF THE MOLD CAVITY, THE INJECTION TEMPERATURE, THE RATE OF INJECTION OF THE MIXTURE, THE RATE OF WHICH THE CAVITY IS EXPANDED AND COMPRESSED, AND THE TIMING OF THE COMPRESSION OF THE MOLD CAVITY ALLOW A SKIN OF DESIRED THICKNESS TO BE FORMED ON THE PLASTIC ARTICLE.
MYPI96000854A 1995-09-28 1996-03-08 Method for controlling skin thickness of plastic article made with controlled density MY132152A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53548595A 1995-09-28 1995-09-28

Publications (1)

Publication Number Publication Date
MY132152A true MY132152A (en) 2007-09-28

Family

ID=38819582

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI96000854A MY132152A (en) 1995-09-28 1996-03-08 Method for controlling skin thickness of plastic article made with controlled density

Country Status (3)

Country Link
KR (1) KR970014977A (en)
MX (1) MX9601053A (en)
MY (1) MY132152A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2932723C (en) * 2013-12-12 2022-08-23 Diab International Ab Apparatus and method for the production of expanded foam embryos

Also Published As

Publication number Publication date
KR970014977A (en) 1997-04-28
MX9601053A (en) 1997-03-29

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