Patent US4397909A successfully refreshed from Google Patents.
US4397909A
Expired / Lapsed
US
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Production of sheet material
Assignee: AECI Ltd
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Filing: 1981-06-01
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Granted: 1983-08-09
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Expires: 2001-06-01
Abstract
Abstract A method of producing sheet material comprises heating a web 10 of closely woven fabric to a temperature of at least 50° C., and preferably to about 150° C., and then impregnating the hot fabric with polyvinylchloride (PVC) paste containing a bonding agent, thereby to provide a material in which the fabric is coated with PVC on each side thereof. Impregnation takes place in a bath 14 with pinch rollers 16 through which the web passes. The pinch rollers 16 squeeze surplus PVC from the web and enhance impregnation. Thereafter the coating can be built up to the desired thickness by dip-coating (in a bath 18) or by a lamination process, whereafter the coated web is cooled in cooling rollers 34 and wound up by a wind-up device 36.
Inventors
- 👤 Vaughan P. Goddard
- 👤 Richard B. C. Le Maitre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:31
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B29; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12; B29B15/122; B29B15/125; B32B38/00; B32B38/08; B32B5/02; B32B5/024; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/244; D06N; D06N3/00; D06N3/04; D06N3/06; D06N7/00; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31645; Y10T428/31649; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T442/00; Y10T442/20; Y10T442/2762; Y10T442/277; Y10T442/2787; Y10T442/2861; Y10T442/2893; Y10T442/291; Y10T442/2918; Y10T442/2926; Y10T442/2934
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
A method of producing sheet material, which method comprises first heating a web of woven fabric, and then impregnating the hot fabric with polyvinylchloride paste thereafter applied to the fabric, thereby to provide a material in which the fabric is coated with polyvinylchloride on each side thereof, the temperature of the hot fabric being at least 50° C. but sufficiently low to permit impregnation of the fabric by the polyvinylchloride paste before any appreciable gelling of the polyvinylchloride paste has taken place, and passing the impregnated fabric through the nip of a pair of opposed pinch rollers whereby pressure is applied to the fabric and surplus polyvinylchloride is squeezed therefrom.
Claim 2
Independent Claim
110 words
A method of producing sheet material, which method comprises first heating a web of woven fabric, and then impregnating the hot fabric with polyvinylchloride paste thereafter applied to the fabric, thereby to provide a material in which the fabric is coated with polyvinylchloride on each side thereof, the temperature of the hot fabric being at least 50° C. but sufficiently low to permit impregnation of the fabric by the polyvinylchloride paste before any appreciable gelling of the polyvinylchloride paste has taken place, and passing the impregnated fabric through the nip of a pair of opposed pinch rollers whereby pressure is applied to the fabric and surplus polyvinylchloride is squeezed therefrom.
Claim 3
Dependent Claim
19 words
A method according to claim 1, wherein the fabric is heated to a temperature of at least 120° C.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein the fabric is heated to a temperature not exceeding 200° C.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the fabric is a closely woven fabric.
Claim 6
Dependent Claim
52 words
A method according to claim 1, wherein said impregnation comprises passing the hot fabric through a bath of said polyvinylchloride paste and then, with the polyvinylchloride which has become attached thereto, through said nip, the pinch rollers along urged together by a force of at least 200 kg/m length of the rollers.
Claim 7
Dependent Claim
24 words
A method according to claim 5, wherein the pinch rollers are urged together by a force of about 2000 kg/m length of the rollers.
Claim 8
Dependent Claim
27 words
A method according to claim 1 wherein, after said impregnation, the layer of polyvinylchloride on each side of the fabric is built up to the desired thickness.
Claim 9
Dependent Claim
14 words
A method according to claim 7, wherein said building up takes place by dip-coating.
Claim 10
Dependent Claim
23 words
A method according to claim 7, wherein said building up takes place by laminating a pre-formed film of polyvinylchloride with the impregnated web.
Claim 11
Dependent Claim
79 words
A method according to claim 1, wherein said impregnation comprises passing the hot fabric through a bath of said polyvinylchloride paste and then, with the polyvinylchloride which has become attached thereto, through said nip; wherein the layer of polyvinylchloride on each side of the fabric is thereafter built up to the desired thickness; wherein the polyvinylchloride in said bath includes a suitable bonding agent; and wherein the polyvinylchloride whereby the layers are built up includes substantially no bonding agent.
Claim 12
Dependent Claim
12 words
Sheet material when made according to the method claimed in claim 1.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |