Dyeing: comprising the dyeing and bleaching of wool, silk, cotton, flax, hemp, china grass &c. by Sansone Antonio

Author:Sansone, Antonio
Language: eng
Format: epub, pdf
Tags: Dyes and dyeing
Publisher: Manchester, Heywood
Published: 1888-03-25T05:00:00+00:00

" The Printing ot Cotton Fabrics," being a communication by M. Horace Koechlin, of Loerroch, the method being employed for woollen tissues that are bleached before printing, and a very good white is obtained.

The following series of operations is often emplo3-cd in the bleaching of Avoollen goods:

For 40 pieces of 20—30 yards each.

1st.— Singeing.*

2nd.—Pass three times through bath, containing 11—121bs. soda crystals, 5—61bs. soda to 60—70lbs. water, and which is heated to about 40° C. After each passage through the bath, add 4—8ozs. soap.

3rd.—Rinse in two clean waters of same temperature.

4th.—Run again three times in a similar bath to the first, but without soap, and add after the first passage 4ozs. more soda.

5th.—Sulphur for 12 hours in the chamber, by burning 11— 121bs. sulphur.

6th.—Run again three times through bath containing 13—141bs. soda to 60—701bs. water, at a temperature of about 50° C; adding ^Ib. more soda after every passage.

7th.—Second sulphuring as before.

8th.—Repeat No. 6.

9th.—Wash in two waters at 30° C.

10th.—Third sulphuring for 12 hours.

11th.—Wash twice in lukewarm and once in cold water.

12th.—Finally blue with indigo carmine.

These operations are generally sufficient for ordinary woollens ; if they contain much colouring matter, or if they are destined for line colours, the process is as follows :

1st.— Singeing and washing in water.

2nd.—Pass through alkaline soap bath containing 11—llilbs. soda crystals, and 4—61bs. soap for 00—70 galls, water at a temperature of 60—70° C.

3rd.—Rinse in warm water.

4th.—Give two passages in a bath like the No. 2, but without soap, at the same temperature.

5th.—Wash once in warm water.

* This operation is performed for fine woollen tissues, and relies on the same principle as the singeing of cotton goods. The singeing machine is shown on plate 30.

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