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US4619799A
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Process of making sheet material comprising a substrate web of synthetic thermoplastic material and an adhesive layer consisting of a non-crosslinkable elastomer
Assignee: Windmoeller and Hoelscher KG
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Filing: 1985-07-19
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Granted: 1986-10-28
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Expires: 2005-07-19
Abstract
Abstract In a process of making sheet material comprising a substrate web of synthetic thermoplastic material and an adhesive layer consisting of a non-crosslinkable elastomer the elastomeric material is heated above its devolatilization temperature by a feed screw of a screw extruder and is devolatilized through venting means (vent opening and vacuum pump 21) and is subsequently pressurized by a booster 7 to a pressure which is sufficient to overcome the backpressure applied by the succeeding blow head.
Inventors
- 👤 Wolfgang Teerling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C48/285; B29C48/288; B29C48/2888; B29C48/30; B29C48/32; B29C48/335; B29C48/375; B29C48/387; B29C48/92; B29C2791/00; B29C2791/004; B29C2791/007; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/9258; B29C2948/9259; B29C2948/92819; B29C2948/92952
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A process of making sheet material comprising a substrate web of synthetic thermoplastic material and an adhesive layer of a non-crosslinkable elastomer, comprising the steps of co-extruding thermoplastic material and non-crosslinkable elastomeric material through an extrusion die to produce the sheet material, heating the elastomeric material, prior to extrusion through the extrusion die, above its devolatilization temperature by a feed screw of a screw extruder, devolatilizing the heated elastomeric material through venting means in the screw extruder, and subsequently pressurizing the devolatilized elastomeric material by a booster to a pressure which is sufficient to overcome back pressure applied by the extrusion die.
Claim 2
Dependent Claim
102 words
A process of making sheet material comprising a substrate web of synthetic thermoplastic material and an adhesive layer of a non-crosslinkable elastomer, comprising the steps of co-extruding thermoplastic material and non-crosslinkable elastomeric material through an extrusion die to produce the sheet material, heating the elastomeric material, prior to extrusion through the extrusion die, above its devolatilization temperature by a feed screw of a screw extruder, devolatilizing the heated elastomeric material through venting means in the screw extruder, and subsequently pressurizing the devolatilized elastomeric material by a booster to a pressure which is sufficient to overcome back pressure applied by the extrusion die.
Claim 3
Dependent Claim
13 words
The process according to claim 1, wherein the booster is a positive-displacement pump.
Claim 4
Dependent Claim
20 words
The process according to claim 1, wherein the booster is a spinning pump type gear pump or a double-screw feeder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |