US3941544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of foamed thermoplastic extruded profiles
Assignee: Wacker Chemie AG
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Filing: 1973-10-09
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Granted: 1976-03-02
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Expires: 1993-10-09
Abstract
Abstract An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw and a form-giving extruder head having a flow channel therethrough characterized in that at least part of the length of said flow channel is divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area whereby each individual channel has a nozzle coefficient k of from 0.1 to 2 mm 3 ; as well as the process of extrusion.
Inventors
- 👤 Hans Jochen Barth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/468
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw and a form-giving extruder head having a flow channel therethrough characterized in that at least part of the length of said flow channel is divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area that each individual channel has a nozzle coefficient k of from 0.1 to 2 mm 3 , said separating walls reducing the cross-section area of said flow channel by a minor amount only.
Claim 2
Independent Claim
103 words
An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw and a form-giving extruder head having a flow channel therethrough characterized in that at least part of the length of said flow channel is divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area that each individual channel has a nozzle coefficient k of from 0.1 to 2 mm 3 , said separating walls reducing the cross-section area of said flow channel by a minor amount only.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said separating walls define individual channels with a rectangular cross-section.
Claim 4
Dependent Claim
19 words
The apparatus of claim 2 wherein said separating walls define individual channels having varied lengths in the axial direction.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1 wherein said individual channels have dimensions of from 3 to 10 mm for width and height and from 30 to 250 mm for length in the axial direction.
Claim 6
Dependent Claim
32 words
The apparatus of claim 1 wherein said separating walls defining said individual channels terminate from 1 to 15 times the height of said flow channel, from the mouth of said flow channel.
Claim 7
Dependent Claim
54 words
The apparatus of claim 5 wherein the zone between the termination of said separating walls and said mouth of said flow channel consists of two areas, a first area terminating with said mouth having parallel walls and a second area extending to the rear having conical walls with a compression of 1:1.05 to 1:1.5.
References Cited (Backward Citations)
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US2886850A
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US3344473A
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US3427371A
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US3343214A
Cited
US3720572A
Cited
US3834849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |