Patent US3920876A successfully refreshed from Google Patents.
US3920876A
Expired / Lapsed
US
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Process for the manufacture of shaped bodies from cellular thermoplastic materials
Assignee: Hoechst AG
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Filing: 1973-05-15
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Granted: 1975-11-18
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Expires: 1993-05-15
Abstract
Abstract A process for the manufacture of profiles of cellular thermoplastic material and a device for carrying out this process. This improved process comprises pressing the thermoplastic material containing a blowing agent through a multiple orificed die plate, the orifices of which enlarge in the direction of the material flow, in such a way that they unite at the latest at the outlet side of the die plate. This process ensures excellent welding of the individual elongated elements issuing from the orifices of the die plate.
Inventors
- 👤 Walter Albert
- 👤 Hans-Otto Schiedrum
- 👤 Heinrich Tacheci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:41
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/468; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
IN A PROCESS FOR THE MANUFACTURE OF A SHAPED BODY OF A CELLULAR MATERIAL BY PRESSING A THERMOPLASTIC MATERIAL CONTAINING A BLOWING AGENT THROUGH A MULTIPLE-ORIFICED DIE PLATE INTO A SHAPING DIE, THE IMPROVEMENT WHICH COMPRISES PRESSING SAID THERMOPLASTIC MATERIAL CONTAINING A BLOWING AGENT THROUGH A MULTIPLE-ORIFICED DIE PLATE HAVING ORIFICES WHICH ENLARGE IN THE DIRECTION OF MATERIAL FLOW, WHEREBY A PLURALITY OF INDIVIDUAL ELONGATED ELEMENTS OF THE THERMOPLASTIC MATERIAL ARE FORMED AND FOAMING OF THE INDIVIDUAL ELONGATED ELEMENTS STARTS IN THE ENLARGMENTS OF THE ORIFICES, UNITING THE ELONGATED ELEMENTS AR THE LATEST AT THEIR EXIT FROM THE MULTIPLE-ORIFICED DIE PLATE, AN PASSING THE UNITED ELONGATED ELEMENTS THROUGH A SHAPING DIE HAVING A CROSS-SECTIONAL AREA WHICH IS AT LEAST AS GREAT AS THE CROSS-SECTIONAL AREA OF THE MULTIPLE-ORIFICED DIE PLATE.
Claim 2
Dependent Claim
130 words
IN A PROCESS FOR THE MANUFACTURE OF A SHAPED BODY OF A CELLULAR MATERIAL BY PRESSING A THERMOPLASTIC MATERIAL CONTAINING A BLOWING AGENT THROUGH A MULTIPLE-ORIFICED DIE PLATE INTO A SHAPING DIE, THE IMPROVEMENT WHICH COMPRISES PRESSING SAID THERMOPLASTIC MATERIAL CONTAINING A BLOWING AGENT THROUGH A MULTIPLE-ORIFICED DIE PLATE HAVING ORIFICES WHICH ENLARGE IN THE DIRECTION OF MATERIAL FLOW, WHEREBY A PLURALITY OF INDIVIDUAL ELONGATED ELEMENTS OF THE THERMOPLASTIC MATERIAL ARE FORMED AND FOAMING OF THE INDIVIDUAL ELONGATED ELEMENTS STARTS IN THE ENLARGMENTS OF THE ORIFICES, UNITING THE ELONGATED ELEMENTS AR THE LATEST AT THEIR EXIT FROM THE MULTIPLE-ORIFICED DIE PLATE, AN PASSING THE UNITED ELONGATED ELEMENTS THROUGH A SHAPING DIE HAVING A CROSS-SECTIONAL AREA WHICH IS AT LEAST AS GREAT AS THE CROSS-SECTIONAL AREA OF THE MULTIPLE-ORIFICED DIE PLATE.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the thermoplastic material is polystyrene or a copolymer of styrene.
Claim 4
Dependent Claim
12 words
A shaped body of cellular thermoplastic material made according to claim 1.
Claim 5
Dependent Claim
13 words
A shaped body as in claim 3 which is a plate or board.
References Cited (Backward Citations)
US2734224A
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US1874503A
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US2026740A
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US2804645A
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US3607596A
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US3720572A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |