Claims
- 1. A continuous process for treating a web of material by the wet-in-wet application of two serially applied treatment baths comprising the steps of:
- (a) applying a first treatment bath to the web;
- (b) squeezing off excess moisture from the web to a moisture content of 60 to 120% of the dry weight of the web;
- (c) applying a second treatment bath to the web while it is still wet from the first treatment bath such that the web is in contact with a quantity of the second treatment bath no greater than that quantity that can be continually absorbed by the web;
- (d) replenishing the second treatment bath as it is continually absorbed by the web in accordance with step c; and
- (e) reducing the moisture content of the web to a total moisture content of 100 to 200% of the dry weight of the web immediately after application of the second treatment bath by wiping it off as it passes through a gap elastically abutting against at least one side of the web.
- 2. The process of claim 1 wherein the first treatment bath comprises a salt bath and the second treatment bath comprises a dye bath of direct dyes such that during step (b) the web is squeezed off to a moisture content of 70 to 90of the dry weight of the web and during step (e) the web is wiped off in the gap to a total moisture content of 130 to 160% of the dry weight of the web.
- 3. The process of claim 1 wherein the first treatment bath comprises a salt bath and the second treatment bath comprises a dye bath of sulphur dyes such that during step (d) the web is squeezed off to a moisture content of 70 to 90% of the dry weight of the web and during step (e) the web is wiped off in the gap to a total moisture content of 160 to 200% of the dry weight of the web.
- 4. The process of claim 1 wherein the first treatment bath comprises an alkali bath and the second treatment bath comprises a dye bath of reactive dyes such that during step (b) the web is squeezed off to a moisture content of 70 to 100% of the dry weight of the web and during step (e) the web is wiped off in the gap to a total moisture content of 160 to 200% of the dry weight of the web.
- 5. The process of claim 4 wherein the first treatment bath comprises a mixture of alkali and salt.
- 6. The process of claim 5 wherein the temperature of the two serially applied treatment baths is approximately the same.
- 7. The process of claim 1 wherein the temperature of the two serially applied treatment baths is approximately the same.
- 8. The process of claim 1 wherein the web of material comprises a textile web.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3733997 |
Oct 1987 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 07/255,611 filed Oct. 11, 1988, now U.S. Pat. No. 4,878,365.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
2460206 |
Wentz |
Jan 1949 |
|
4439881 |
von der Eltz et al. |
Apr 1984 |
|
4845791 |
Schwemmer et al. |
Jul 1989 |
|
4878365 |
Kutz et al. |
Feb 1990 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
1078527 |
Mar 1960 |
DEX |
1381081 |
Oct 1964 |
FRX |
2037337 |
Jul 1980 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
255611 |
Oct 1988 |
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