CA2002007A1 - Injection molding apparatus and method - Google Patents
Injection molding apparatus and methodInfo
- Publication number
- CA2002007A1 CA2002007A1 CA2002007A CA2002007A CA2002007A1 CA 2002007 A1 CA2002007 A1 CA 2002007A1 CA 2002007 A CA2002007 A CA 2002007A CA 2002007 A CA2002007 A CA 2002007A CA 2002007 A1 CA2002007 A1 CA 2002007A1
- 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
- 238000000034 method Methods 0.000 title abstract 2
- 238000001746 injection moulding Methods 0.000 title 1
- 239000007789 gas Substances 0.000 abstract 6
- 239000004033 plastic Substances 0.000 abstract 3
- 238000002347 injection Methods 0.000 abstract 2
- 239000007924 injection Substances 0.000 abstract 2
- 239000012815 thermoplastic material Substances 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 239000012768 molten material Substances 0.000 abstract 1
- 238000009420 retrofitting Methods 0.000 abstract 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
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 exisiting 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.
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 exisiting 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002208200A CA2208200C (en) | 1988-11-02 | 1989-11-01 | Injection molding apparatus and method |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US266,476 | 1988-11-02 | ||
| US07/266,476 US5015166A (en) | 1988-11-02 | 1988-11-02 | Injection molding apparatus for making a hollow object |
| US266,477 | 1988-11-02 | ||
| US07/266,477 US5066214A (en) | 1988-11-02 | 1988-11-02 | Injection molding apparatus |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002208200A Division CA2208200C (en) | 1988-11-02 | 1989-11-01 | Injection molding apparatus and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2002007A1 true CA2002007A1 (en) | 1990-05-02 |
| CA2002007C CA2002007C (en) | 1998-02-24 |
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 After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002208200A Expired - Fee Related CA2208200C (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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317718A (en) * | 2020-11-04 | 2021-02-05 | 温州俪狄机电科技有限公司 | Injection mold based on can be fast die-cast |
| CN116593727A (en) * | 2023-05-18 | 2023-08-15 | 温州伟力汽车部件有限公司 | ABS sensor end and automatic injection molding manufacturing equipment thereof |
Families Citing this family (2)
| 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 |
| US7255818B2 (en) | 2004-11-08 | 2007-08-14 | Lear Corporation | Process control for gas-assisted injection molding applications |
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 |
|---|---|---|---|---|
| CN112317718A (en) * | 2020-11-04 | 2021-02-05 | 温州俪狄机电科技有限公司 | Injection mold based on can be fast die-cast |
| CN116593727A (en) * | 2023-05-18 | 2023-08-15 | 温州伟力汽车部件有限公司 | ABS sensor end and automatic injection molding manufacturing equipment thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02223421A (en) | 1990-09-05 |
| CA2208200C (en) | 2003-04-01 |
| JPH0733040B2 (en) | 1995-04-12 |
| CA2002007C (en) | 1998-02-24 |
| CA2208200A1 (en) | 1990-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |