IT1034462B - Die for extrusion of double walled tube - using heated air to support the walls against distortion while hot - Google Patents
Die for extrusion of double walled tube - using heated air to support the walls against distortion while hotInfo
- Publication number
- IT1034462B IT1034462B IT2149475A IT2149475A IT1034462B IT 1034462 B IT1034462 B IT 1034462B IT 2149475 A IT2149475 A IT 2149475A IT 2149475 A IT2149475 A IT 2149475A IT 1034462 B IT1034462 B IT 1034462B
- Authority
- IT
- Italy
- Prior art keywords
- die
- double walled
- air
- walled tube
- extrusion
- Prior art date
Links
Abstract
Die for simultaneous injection moulding of two concentric tubes to form segments of a double walled tube or hose, with means for feeding between the tubes, air which is above atmospheric pressure at a temp. above the softening pt. of the relevant moulding matl. The interstitial air temp. and pressure are controlled to allow the outer wall to be shaped to an undulating or helical profile, viz by a convergant series of split external moulds, while the inner wall maintains a substantially smooth profile which does not collapse either into the external pockets or into the tube bore. Positive interstitial air pressure avoids local collapse of the external walls prior to chilling. Use of preheated air avoids an excessive cooling load on the moulding tools and the die.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2413878A DE2413878C3 (en) | 1974-03-22 | 1974-03-22 | Process for producing a double-walled plastic pipe with a corrugated outer wall and a smooth inner wall and a device for carrying out this process |
| DE2413879A DE2413879C3 (en) | 1974-03-22 | 1974-03-22 | Device for the production of a double-walled plastic pipe from a corrugated outer pipe and a smooth inner pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT1034462B true IT1034462B (en) | 1979-09-10 |
Family
ID=25766857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT2149475A IT1034462B (en) | 1974-03-22 | 1975-03-21 | Die for extrusion of double walled tube - using heated air to support the walls against distortion while hot |
Country Status (9)
| Country | Link |
|---|---|
| AR (1) | AR207352A1 (en) |
| BG (1) | BG27885A3 (en) |
| BR (1) | BR7501741A (en) |
| EG (1) | EG11746A (en) |
| FI (1) | FI60990C (en) |
| IL (1) | IL46892A (en) |
| IT (1) | IT1034462B (en) |
| PL (1) | PL100947B1 (en) |
| YU (1) | YU67975A (en) |
-
1975
- 1975-01-01 AR AR25797175A patent/AR207352A1/en active
- 1975-03-14 BG BG2930275A patent/BG27885A3/en unknown
- 1975-03-19 YU YU67975A patent/YU67975A/en unknown
- 1975-03-20 FI FI750830A patent/FI60990C/en not_active IP Right Cessation
- 1975-03-20 PL PL17893375A patent/PL100947B1/en unknown
- 1975-03-21 IL IL46892A patent/IL46892A/en unknown
- 1975-03-21 IT IT2149475A patent/IT1034462B/en active
- 1975-03-22 EG EG14675A patent/EG11746A/en active
- 1975-03-24 BR BR7501741A patent/BR7501741A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL100947B1 (en) | 1978-11-30 |
| YU67975A (en) | 1982-02-28 |
| BG27885A3 (en) | 1980-01-15 |
| FI750830A (en) | 1975-09-23 |
| IL46892A0 (en) | 1975-05-22 |
| FI60990B (en) | 1982-01-29 |
| EG11746A (en) | 1978-12-31 |
| IL46892A (en) | 1978-07-31 |
| AR207352A1 (en) | 1976-09-30 |
| AU7943675A (en) | 1976-09-30 |
| FI60990C (en) | 1982-05-10 |
| BR7501741A (en) | 1975-12-23 |
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