GB758332A - Process for the injection molding of polytetrafluoroethylene - Google Patents
Process for the injection molding of polytetrafluoroethyleneInfo
- Publication number
- GB758332A GB758332A GB37288/54A GB3728854A GB758332A GB 758332 A GB758332 A GB 758332A GB 37288/54 A GB37288/54 A GB 37288/54A GB 3728854 A GB3728854 A GB 3728854A GB 758332 A GB758332 A GB 758332A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- heated
- group
- temperature
- pressure
- 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.)
- Expired
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
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
Abstract
Granulated polytetrafluoroethylene is heated to a preliminary temperature in the range of 300-400 DEG C. under a pressure, which may be atmospheric or superatmospheric, which prevents melting of the P.T.F.E. at that temperature, and the heated P.T.F.E. is injected into a closed mould and melted substantially instantaneously thereafter. The preferred procedure is to preheat the material to a temperature above 327 DEG C. under superatmospheric pressure and then inject it into a cool mould, whereupon the material, being released from pressure, melts at once in the mould and then cools in the mould. In another procedure the material is heated to a temperature below 327 DEG C. and then injected into a hot mould, the heat of the mould melting it at once, and then cooled in the mould. Three examples are given. Details concerning the granulation of P.T.F.E. also are given. Specifications 572,265, 583,418 [both in Group IV], 588,648, 625,348 [Group IV(a)], 644,008 and 689,400 [Group IV(a)] are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US758332XA | 1954-01-22 | 1954-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB758332A true GB758332A (en) | 1956-10-03 |
Family
ID=22128275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37288/54A Expired GB758332A (en) | 1954-01-22 | 1954-12-23 | Process for the injection molding of polytetrafluoroethylene |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB758332A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1120219A1 (en) * | 1998-06-15 | 2001-08-01 | Daikin Industries, Ltd. | Method for molding fluororesin and molded article |
-
1954
- 1954-12-23 GB GB37288/54A patent/GB758332A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1120219A1 (en) * | 1998-06-15 | 2001-08-01 | Daikin Industries, Ltd. | Method for molding fluororesin and molded article |
| EP1120219A4 (en) * | 1998-06-15 | 2007-05-02 | Daikin Ind Ltd | Method for molding fluororesin and molded article |
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