CA2208200A1 - Injection molding apparatus and method - Google Patents
Injection molding apparatus and methodInfo
- 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
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.
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)
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)
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)
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 |
-
1989
- 1989-11-01 CA CA002002007A patent/CA2002007C/en not_active Expired - Fee Related
- 1989-11-01 CA CA002208200A patent/CA2208200C/en not_active Expired - Fee Related
- 1989-11-02 JP JP1287252A patent/JPH0733040B2/en not_active Expired - Lifetime
Cited By (3)
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
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |