Claims
- 1. Apparatus for the continuous liquid ammonia processing of fabric webs containing cellulosic fibers, which comprises
- (a) means forming a substantially closed treating chamber,
- (b) means for guiding a fabric web through said chamber,
- (c) means near the entry end of said chamber for impregnating said fabric web with substantially anhydrous liquid ammonia,
- (d) means for treating the ammonia-impregnated web to drive off most of said ammonia,
- (e) means on the downstream side of the treating means for applying moisture to at least one surface of the fabric web,
- (f) means for treating the moistened web to cause the applied moisture to penetrate the fabric,
- (g) the moisture applied to said fabric serving to replace the residual ammonia in the fabric,
- (h) means for effecting at least partial removal of the applied moisture, and
- (i) means for thereafter discharging the fabric from said chamber.
- 2. Apparatus according to claim 1, further characterized by
- (a) said means for applying moisture comprising one or more fabric surface contacting rollers and means to form a very thin film of water on the surfaces of said rollers.
- 3. Apparatus according to claim 2, further characterized by
- (a) said chamber being divided to define a moisture application zone, for containing said means for applying moisture,
- (b) means for maintaining a dry steam atmosphere in said zone,
- (c) means for cooling said surface contacting rollers whereby to cause condensation of said steam on the surfaces thereof, and
- (d) means to guide said fabric into limited arc contact with said rollers, whereby at least portions of the roller surfaces are at all times exposed to said steam atmosphere.
- 4. Apparatus according to claim 3, further characterized by
- (a) said means for treating the moistened web comprising a further fabric surface contacting roller in said zone, and means to maintain the surface thereof at a temperature above 100.degree. C.
- 5. Apparatus according to claim 3, further characterized by
- (a) said means for effecting at least partial removal of applied moisture comprising means for directing jets of dry steam through said fabric.
Parent Case Info
This is a division of application Ser. No. 695,471 filed June 14, 1976, and now U.S. Pat. No. 4,099,911.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
779149 |
Jul 1957 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
695471 |
Jun 1976 |
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