Patent US4242380A successfully refreshed from Google Patents.
US4242380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of non-woven fabric in order to improve the properties thereof
Assignee: Individual
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Filing: 1979-06-06
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Granted: 1980-12-30
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Expires: 1999-06-06
Abstract
Abstract The impregnation of a non-woven fabric with a plastisol is accomplished by first coating the fabric with a heated plastisol having a viscosity in the range of 4 to 30 poise, subsequently pressing the coated fabric against a rotating cylinder which has been heated to within the range of 130° to 180° C. and maintaining the coated fabric in contact with the cylinder for a sufficient time to obtain complete impregnation of the fabric by the plastisol and to gel the plastisol to the side of the fabric disposed away from the cylinder.
Inventors
- 👤 Jean-Francois Courtoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:14
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/04; D06N3/06; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2049
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
190 words
A process for the impregnation of non-woven fabric with a plastisol comprising the steps of: selecting the viscosity of a liquid plastisol so that it has a Newtonian viscosity in the range of 6 to 15 poise; maintaining the selected plastisol in liquid form at a temperature in the range of 5° to 50° C.; coating a moving web of non-woven fabric with the liquid plastisol; heating a rotating cylinder such that it has a surface temperature in the range of between 130° and 180° C.; urging the plastisol coated non-woven fabric web against the heated cylinder by means of a resilient pressure roll having a diameter which is smaller than the diameter of the heated cylinder to cause the plastisol to impregnate the fabric; maintaining the plastisol impregnated non-woven fabric web in contact with the heated surface of the cylinder downstream of the pressure roll in the direction of web travel for a sufficient time to cause the plastisol to gel to the surface of the web disposed away from the cylinder; and removing the coated web from the cylinder for further processing prior to fusing of the plastisol.
Claim 2
Dependent Claim
190 words
A process for the impregnation of non-woven fabric with a plastisol comprising the steps of: selecting the viscosity of a liquid plastisol so that it has a Newtonian viscosity in the range of 6 to 15 poise; maintaining the selected plastisol in liquid form at a temperature in the range of 5° to 50° C.; coating a moving web of non-woven fabric with the liquid plastisol; heating a rotating cylinder such that it has a surface temperature in the range of between 130° and 180° C.; urging the plastisol coated non-woven fabric web against the heated cylinder by means of a resilient pressure roll having a diameter which is smaller than the diameter of the heated cylinder to cause the plastisol to impregnate the fabric; maintaining the plastisol impregnated non-woven fabric web in contact with the heated surface of the cylinder downstream of the pressure roll in the direction of web travel for a sufficient time to cause the plastisol to gel to the surface of the web disposed away from the cylinder; and removing the coated web from the cylinder for further processing prior to fusing of the plastisol.
Claim 3
Dependent Claim
63 words
The method of claim 1 wherein the heated cylinder has a diameter of 2 m, the speed of movement of the web is in the range of 8 to 40 m/min and wherein the step of maintaining the web in contact with the cylinder comprises: causing the web to be in contact with at least 75% of the outer periphery of the cylinder.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the viscosity of the plastisol is maintained at 8 poise.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein the viscosity of the plastisol is maintained at 8 poise.
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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |