US3922391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sheet material for use as gaskets
Assignee: TBA Industrial Products Ltd
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Filing: 1973-08-31
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Granted: 1975-11-25
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Expires: 1993-08-31
Abstract
Abstract A process for producing in indefinitely long lengths composite sheet material consisting of a metal core coated on both sides with a fibre reinforced elastomeric material comprises coating both sides of the core with an adhesive; applying the elastomeric coatings to both sides of the core simultaneously by drawing the core through a nip between two rotating calender rolls by means of a tensioning device which acts on the core downstream of the calender rolls, feeding an uncured doughlike composition of fibre-reinforced elastomeric material, containing a solvent system including a volatile solvent for the elastomer and a nonsolvent liquid which prevents adhesion of the composition to the rolls, to both sides of the core as it passes through the nip, the feeding and viscosity of the dough-like composition being controlled so that coatings of the composition are spread evenly over both sides of the core; and subsequently curing the coatings.
Inventors
- 👤 John Geoffrey Qualtrough
- 👤 Harry Thornley
- 👤 David John Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:59
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29D; B29D99/00; B29D99/0053; B32B3/00; B32B3/26; B32B3/266; B32B37/00; B32B37/14; B32B37/24; B32B38/00; B32B38/18; B32B38/1875; F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; B29L; B29L2031/00; B29L2031/26; B32B2305/00; B32B2305/08; B32B2581/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
195 words
A PROCESS FOR PRODUCING IN INDEFINITELY LONG LENGTHS COMPOSITE SHEET MATERIAL COMPRISING A METAL CORE HAVING A FIBREREINFORCED ELASTOMER PERMANENTLY SECURED TO BOTH SIDES THEREOF, SAID PROCESS COMPRISING THE STEPS OF COMPOUNDING A CURABLE DOUGH FROM FIBRE, ELASTOMER, CURATIVES AND A SOLVENT SYSTEM INCLUDING A VOLATILE SOLVENT FOR THE ELASTOMER AND A LIQUID WHICH IS A NON-SOLVENT FOR SAID ELASTOMER, PELLETIZING, SAID CURABLE DOUGH, COATING BOTH SIDES OF THE CORE WITH AN ADHESIVE CAPABLE OF BEING TACKIFIED BY THE SOLVENT FOR THE ELASTOMER, THEN DRAWING THE METAL CORE THROUGH A NIP BETWEEN TWO CALENDER ROLLS BY MEANS OF A TENSIONING DEVICE ACTING ON THE CORE DOWNSTREAM OF SAID NIP TO DRAW THE CORE AT A SPEED EQUAL TO THE SURFACE SPEED OF THE CALENDER ROLLS, FEEDING PELLETS OF SAID CURABLE DOUGH SIMULTANEOUSLY TO BOTH SIDES OF SAID CORE AS IT ENTERS SAID NIP, WITH SAID NON-SOLVENT LIQUID SERVING TO PREVENT ADHESION OF THE DOUGH TO THE ROLLS, WHILE CONTROLLING THE FEED AND VISCOSITY OF THE CURABLE DOUGH SO THAT COATINGS OF SAID DOUGH ARE SPREAD EVENLY OVER BOTH SIDES OF THE CORE, DRYING SAID COATINGS PRIOR TO THE TENSIONING DEVICE, AND SUBSEQUENTLY CURING THE COATINGS.
Claim 2
Dependent Claim
195 words
A PROCESS FOR PRODUCING IN INDEFINITELY LONG LENGTHS COMPOSITE SHEET MATERIAL COMPRISING A METAL CORE HAVING A FIBREREINFORCED ELASTOMER PERMANENTLY SECURED TO BOTH SIDES THEREOF, SAID PROCESS COMPRISING THE STEPS OF COMPOUNDING A CURABLE DOUGH FROM FIBRE, ELASTOMER, CURATIVES AND A SOLVENT SYSTEM INCLUDING A VOLATILE SOLVENT FOR THE ELASTOMER AND A LIQUID WHICH IS A NON-SOLVENT FOR SAID ELASTOMER, PELLETIZING, SAID CURABLE DOUGH, COATING BOTH SIDES OF THE CORE WITH AN ADHESIVE CAPABLE OF BEING TACKIFIED BY THE SOLVENT FOR THE ELASTOMER, THEN DRAWING THE METAL CORE THROUGH A NIP BETWEEN TWO CALENDER ROLLS BY MEANS OF A TENSIONING DEVICE ACTING ON THE CORE DOWNSTREAM OF SAID NIP TO DRAW THE CORE AT A SPEED EQUAL TO THE SURFACE SPEED OF THE CALENDER ROLLS, FEEDING PELLETS OF SAID CURABLE DOUGH SIMULTANEOUSLY TO BOTH SIDES OF SAID CORE AS IT ENTERS SAID NIP, WITH SAID NON-SOLVENT LIQUID SERVING TO PREVENT ADHESION OF THE DOUGH TO THE ROLLS, WHILE CONTROLLING THE FEED AND VISCOSITY OF THE CURABLE DOUGH SO THAT COATINGS OF SAID DOUGH ARE SPREAD EVENLY OVER BOTH SIDES OF THE CORE, DRYING SAID COATINGS PRIOR TO THE TENSIONING DEVICE, AND SUBSEQUENTLY CURING THE COATINGS.
Claim 3
Dependent Claim
15 words
A process according to claim 1 in which the metal core is a plain sheet.
Claim 4
Dependent Claim
15 words
A process according to claim 1, in which the metal core is a perforated sheet.
Claim 5
Dependent Claim
15 words
A process according to claim 1, in which the metal core is an embossed sheet.
Claim 6
Dependent Claim
19 words
A process according to claim 1, in which the metal core is of woven wire gauze or expanded metal.
Claim 7
Dependent Claim
20 words
A process according to claim 1, in which the adhesive is a mixture of nitrile rubber and a phenolic resin.
Claim 8
Dependent Claim
19 words
A process according to claim 1, in which the adhesive is in a film at least 5 microns thick.
Claim 9
Dependent Claim
34 words
A process according to claim 1, in which dough-like compositions of different viscosities are fed to the two sides of the core so that coatings of different thicknesses are produced on the two sides.
Claim 10
Dependent Claim
31 words
A process according to claim 1, in which the coatings are consolidated by passing the coated core between a further pair of calender rolls before curing the composition by further heating.
Claim 11
Dependent Claim
12 words
A process according to claim 1, in which the fibre is asbestos.
Claim 12
Dependent Claim
15 words
A process according to claim 10, in which the volatile solvent is a liquid hydrocarbon.
Claim 13
Dependent Claim
12 words
A process according to claim 11, in which the hydrocarbon is toluene.
Claim 14
Dependent Claim
13 words
A process according to claim 1, in which the non-solvent liquid is water.
Claim 15
Dependent Claim
39 words
A process according to claim 13, in which said solvent is toluene and in which the ratio of toluene to water in the solvent system is greater than 4 to 1 and less than 10 to 1 by volume.
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US3264132A
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US3453164A
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |