Patent FR1520475A successfully refreshed from Google Patents.
US3835209A
Expired / Lapsed
US
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Process of extruding a foamed extrudate and controlling the thickness thereof
Assignee: OI Glass Inc
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Filing: 1971-11-09
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Granted: 1974-09-10
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Expires: 1991-11-09
Abstract
Abstract Caliper in the cross direction of webs of extruded foam plastic produced by longitudinal slitting of a tubular extrusion is controlled by differentially cooling the extrusion circumferentially about its axis as it is extruded. This can be accomplished by locating a plurality of independently controllable air cooling ducts around and following the die orifice.
Inventors
- 👤 J Karabedian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:27
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/25; B29C48/78; B29C48/86; B29C48/865; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92609; B29C2948/92647; B29C2948/92657; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29L; B29L2023/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
In a process for continuously producing a sheet of foam thermoplastic material in which a foamable thermoplastic resin material is plasticated and extruded through the orifice of a heated die, the method for controlling the thickness of said sheet between the outer surfaces thereof and in the direction transverse to the direction of extrusion and hence, across the width thereof which comprises cooling said material by directing a plurality of separately controllable gas streams having a temperature less than that of the extruded material on a surface of said material as it emerges from said orifice and is expanding, said streams being disposed relative to each other in said direction transverse to the direction of extrusion, and increasing the cooling of a portion of said material by the gas stream which impinges on said portion of the material which it is desired to reduce in thickness relative to other portions thereof by Adjusting the gas flowing in the gas stream and decreasing the cooling of said portion by said gas stream by adjusting the gas flowing in the gas stream when it is desired to increase the thickness thereof.
Claim 2
Dependent Claim
189 words
In a process for continuously producing a sheet of foam thermoplastic material in which a foamable thermoplastic resin material is plasticated and extruded through the orifice of a heated die, the method for controlling the thickness of said sheet between the outer surfaces thereof and in the direction transverse to the direction of extrusion and hence, across the width thereof which comprises cooling said material by directing a plurality of separately controllable gas streams having a temperature less than that of the extruded material on a surface of said material as it emerges from said orifice and is expanding, said streams being disposed relative to each other in said direction transverse to the direction of extrusion, and increasing the cooling of a portion of said material by the gas stream which impinges on said portion of the material which it is desired to reduce in thickness relative to other portions thereof by Adjusting the gas flowing in the gas stream and decreasing the cooling of said portion by said gas stream by adjusting the gas flowing in the gas stream when it is desired to increase the thickness thereof.
Claim 3
Dependent Claim
68 words
The method as set forth in claim 1, further comprising additionally cooling said material by directing at least one further plurality of gas streams on a surface of said material, said further plurality of gas streams being disposed relative to each other in said direction transverse to the direction of extrusion and relative to the first-mentioned plurality of gas streams, in the direction of extrusion of said material.
Claim 4
Dependent Claim
35 words
The method as set forth in claim 2, further comprising withdrawing gas of said streams by suction from adjacent said material intermediate the first-mentioned plurality of gas streams and said further plurality of gas streams.
Claim 5
Dependent Claim
57 words
The method as set forth in claim 2, wherein the number of gas streams in said further plurality thereof is equal to the number of gas streams in the first-mentioned plurality thereof and each gas stream in said further plurality thereof is aligned in said direction of extrusion with a gas stream in said first-mentioned plurality thereof.
Claim 6
Dependent Claim
40 words
The method as set forth in claim 1, wherein said orifice is annular and produces an extruded tube of said material and wherein said gas streams are disposed circumferentially of said tube and are directed on the exterior surface thereof.
Claim 7
Dependent Claim
40 words
The method as set forth in claim 1, wherein said orifice is annular and produces an extruded tube of said material and wherein said gas streams are disposed circumferentially of said tube and are directed on the interior surface thereof.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |