BE786847Q - Injection mould of foam plastics - Google Patents
Injection mould of foam plasticsInfo
- Publication number
- BE786847Q BE786847Q BE786847A BE786847A BE786847Q BE 786847 Q BE786847 Q BE 786847Q BE 786847 A BE786847 A BE 786847A BE 786847 A BE786847 A BE 786847A BE 786847 Q BE786847 Q BE 786847Q
- Authority
- BE
- Belgium
- Prior art keywords
- foaming
- pressure
- mixture
- mould
- injection mould
- Prior art date
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
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/422—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum by injecting by forward movement of the plastizising screw
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Components are moulded from a foamable molten plastic and a foaming agent, e.g. granular polypropylene or polystyrene sprayed with azobisformamide. The pressure exerted on the mixture is higher than the blowing pressure of the foaming agent. The mixture is maintained in liquid state until it has reached the injection mould and the foaming process is controlled to produce components of high cellular quality. The liquid mixture is placed in a mould cavity at a pressure above that necessary for foaming and the temperature is increased to that necessary for foaming. After the mould is filled the pressure is reduced to a value equal to the blowing pressure.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES372732A ES372732A1 (en) | 1968-10-15 | 1969-10-10 | Improvements in or relating to the moulding of articles of a cellular thermoplastic material |
AR22470669 | 1969-10-14 | ||
AR17433969 | 1969-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE786847Q true BE786847Q (en) | 1972-11-16 |
Family
ID=27145650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE786847A BE786847Q (en) | 1969-10-10 | 1972-07-27 | Injection mould of foam plastics |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE786847Q (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0615834A1 (en) * | 1993-03-15 | 1994-09-21 | Sumitomo Wiring Systems, Ltd. | Molded part of thermoplastic resin and method of fabricating same |
-
1972
- 1972-07-27 BE BE786847A patent/BE786847Q/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0615834A1 (en) * | 1993-03-15 | 1994-09-21 | Sumitomo Wiring Systems, Ltd. | Molded part of thermoplastic resin and method of fabricating same |
US5645779A (en) * | 1993-03-15 | 1997-07-08 | Sumitomo Wiring Systems, Ltd. | Molding part of thermoplastic resin and method of fabricating same |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RE | Patent lapsed |
Owner name: USM CORP. Effective date: 19840727 |