JPS5763231A - Foaming extrusion molding - Google Patents
Foaming extrusion moldingInfo
- Publication number
- JPS5763231A JPS5763231A JP55137789A JP13778980A JPS5763231A JP S5763231 A JPS5763231 A JP S5763231A JP 55137789 A JP55137789 A JP 55137789A JP 13778980 A JP13778980 A JP 13778980A JP S5763231 A JPS5763231 A JP S5763231A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- foamed
- foaming
- melted
- expanded
- 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.)
- Pending
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
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
PURPOSE:To obtain a molding of a low specific gravity with a better appearance and even foaming property by passing a melted synthetic resin through a ripening area as foamed through a drawing section of a die to form a skin and then, through an expanded sizer slowly inclined to complete the foaming. CONSTITUTION:An foaming agent (e.g. azodicarboxylic amide) and an unfoamed resin 11 of thermoplastic synthetic resin (e.g. PE) melted and mixed in an extruder are passed through a drawing section 13 provided at a resin passage in a die 12 and rapidly expanded and foamed to yield a melted foamed synthetic resin 14. The resin thus obtained is passed through a ripening area 19 which is adjusted and retained at such a condition to ensure the best skin below the melting point thereof (e.g. 30 deg.C) to form a skin. The foamed resin 20 is continually foamed through an expanded sizer 15 slowly inclined in the flow direction of the resin to obtain a molding 15 while still melted inside leaving a foaming force. The temperature is controlled to a level to match the state of foaming with cooling water tanks 16 and 17 as required. USE:Building material, car part material and the like.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137789A JPS5763231A (en) | 1980-10-03 | 1980-10-03 | Foaming extrusion molding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137789A JPS5763231A (en) | 1980-10-03 | 1980-10-03 | Foaming extrusion molding |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5763231A true JPS5763231A (en) | 1982-04-16 |
Family
ID=15206878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55137789A Pending JPS5763231A (en) | 1980-10-03 | 1980-10-03 | Foaming extrusion molding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5763231A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4960549A (en) * | 1988-05-23 | 1990-10-02 | Amoco Corporation | Process for preparing polyamide-imide foam |
-
1980
- 1980-10-03 JP JP55137789A patent/JPS5763231A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4960549A (en) * | 1988-05-23 | 1990-10-02 | Amoco Corporation | Process for preparing polyamide-imide foam |
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