Claims
- 1. A method of making a filter fabric comprising the steps of:
- (a) mixing a lubricating agent with glass fibers having a diameter of from 2-8 microns;
- (b) forming a non-woven batt layer from said glass fibers;
- (c) forming a base layer from mineral fibers;
- (d) resin impregnating and needling together said base layer and said batt;
- (e) pressing said fabric to a degree sufficient to obtain a predetermined resin solids pickup;
- (f) drying said fabric at a temperature sufficient to remove any liquid solvent; and
- (g) heating said fabric at a temperature sufficient to cure said resin.
- 2. A method as described in claim 1 wherein said mixing step includes mixing an antistatic material with said lubricating agent and said glass fibers.
- 3. A method as described in claim 2 wherein said mixing step includes blending carrier fibers with said lubricating agent, said glass fibers, and said antistatic material.
- 4. A method as described in claim 1 wherein said mixing step includes blending carrier fibers with said lubricating agent and said glass fibers.
- 5. A method as described in claim 1 wherein said forming step includes weaving yarns to form a woven base layer.
- 6. A method as described in claim 1 wherein said batt is formed by carding and cross-lapping.
- 7. A method as described in claim 1 wherein said batt is formed by air laying.
- 8. A method as described in claim 1 wherein said resin is cured at from 300.degree. to 400.degree. Fahrenheit.
- 9. A method as described in claim 1 including the steps of impregnating said batt layer with resin, impregnating said base layer with resin, and then needling together said batt layer and said base layer.
- 10. A method as described in claim 1 including the step of needling together said batt layer and said base layer and then impregnating the composite structure.
- 11. A method as described in claim 1 including the step of coating said mineral fibers with resin prior to forming said base layer.
Parent Case Info
This is a division of application Ser. No. 680,602 filed Apr. 27, 1976 now U.S. Pat. No. 4,070,519.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3356561 |
Squire et al. |
Dec 1967 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
680602 |
Apr 1976 |
|