CA2208200A1 - Injection molding apparatus and method - Google Patents

Injection molding apparatus and method

Info

Publication number
CA2208200A1
CA2208200A1 CA002208200A CA2208200A CA2208200A1 CA 2208200 A1 CA2208200 A1 CA 2208200A1 CA 002208200 A CA002208200 A CA 002208200A CA 2208200 A CA2208200 A CA 2208200A CA 2208200 A1 CA2208200 A1 CA 2208200A1
Authority
CA
Canada
Prior art keywords
mold
gas
sprue bushing
adapter
adequate
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
CA002208200A
Other languages
French (fr)
Other versions
CA2208200C (en
Inventor
Indra R. Baxi
Erik E. Erikson
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.)
Melea Ltd
Original Assignee
Individual
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 US07/266,477 external-priority patent/US5066214A/en
Priority claimed from US07/266,476 external-priority patent/US5015166A/en
Application filed by Individual filed Critical Individual
Publication of CA2208200A1 publication Critical patent/CA2208200A1/en
Application granted granted Critical
Publication of CA2208200C publication Critical patent/CA2208200C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

A method and apparatus for making a plastic injection molded part with a smooth surface or skin and a hollow core wherein thermoplastic material is injected as a molten stream into the mold cavity through a sprue bushing fixed in the mold. Simultaneously, an unmeasured quantity of inert gas is introduced through an adapter into the molten stream at the sprue bushing substantially coaxially with the melt stream and at a pressure sufficient to penetrate the thermoplastic material to form a gas cavity in the molten material in the mold. For retrofitting an existing mold, an adapter can be added to the existing sprue bushing. During plastic injection and cooling in the mold the gas is maintained at a high pressure, preset, constant and adequate to maintain the plastic against the mold surface until it is self-supporting. The gas is exhausted from the mold, back through the sprue bushing and adapter, before the mold is opened. Adequate preset high pressure is maintained at the gas supply by a large cylinder having a positive displacement member therein that is controlled by a pressure sensor in the gas pressure line to the mold to maintain preset adequate gas pressure within the cavity.
CA002208200A 1988-11-02 1989-11-01 Injection molding apparatus and method Expired - Fee Related CA2208200C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US266,477 1988-11-02
US07/266,477 US5066214A (en) 1988-11-02 1988-11-02 Injection molding apparatus
US266,476 1988-11-02
US07/266,476 US5015166A (en) 1988-11-02 1988-11-02 Injection molding apparatus for making a hollow object
CA002002007A CA2002007C (en) 1988-11-02 1989-11-01 Injection molding apparatus and method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002002007A Division CA2002007C (en) 1988-11-02 1989-11-01 Injection molding apparatus and method

Publications (2)

Publication Number Publication Date
CA2208200A1 true CA2208200A1 (en) 1990-05-02
CA2208200C CA2208200C (en) 2003-04-01

Family

ID=26951871

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002002007A Expired - Fee Related CA2002007C (en) 1988-11-02 1989-11-01 Injection molding apparatus and method
CA002208200A Expired - Fee Related CA2208200C (en) 1988-11-02 1989-11-01 Injection molding apparatus and method

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA002002007A Expired - Fee Related CA2002007C (en) 1988-11-02 1989-11-01 Injection molding apparatus and method

Country Status (2)

Country Link
JP (1) JPH0733040B2 (en)
CA (2) CA2002007C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419843A (en) * 2004-11-08 2006-05-10 Lear Corp Fluid-assisted injection moulding control using a pressure transducer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049056A (en) * 1990-03-14 1991-09-17 Nitrojection Corporation Gas supply sprue bushing for injection molding machines
CN112317718B (en) * 2020-11-04 2021-12-24 深圳市嘉宇顺科技有限公司 Injection mold based on can be fast die-cast
CN116593727B (en) * 2023-05-18 2023-10-31 温州伟力汽车部件有限公司 ABS sensor end and automatic injection molding manufacturing equipment thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53102960A (en) * 1977-02-21 1978-09-07 Asahi Chem Ind Co Ltd Injection mold
JPS6378714A (en) * 1986-05-19 1988-04-08 旭化成株式会社 Method and device for manufacturing injection molding of plastic material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419843A (en) * 2004-11-08 2006-05-10 Lear Corp Fluid-assisted injection moulding control using a pressure transducer
US7255818B2 (en) 2004-11-08 2007-08-14 Lear Corporation Process control for gas-assisted injection molding applications
GB2419843B (en) * 2004-11-08 2008-03-12 Lear Corp Process control for gas-assisted injection molding applications

Also Published As

Publication number Publication date
CA2002007C (en) 1998-02-24
CA2208200C (en) 2003-04-01
CA2002007A1 (en) 1990-05-02
JPH0733040B2 (en) 1995-04-12
JPH02223421A (en) 1990-09-05

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Legal Events

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