Pad steam method

Pad steam method:

 

Steps:

1)    Fabric is first padded in a padder with the dye.

2)    It is then passed through between two squeezing roller in a dryer. Drying should be done slowly; otherwise precipitation of dye due to quick removal of water may take place leading to lower color value.

3)    After coming out from dryer fabric is padded in a padder containing salt and alkali. Due to salt exhaustion of dye takes place and due to alkali fixation occurs.

4)    Fabric then passed through a steamer where it is kept for 15-19 second. Due to high temperature here fixation rate increases.

5)    In this step fabric is washed in a washing machine to remove the unfixed dye.

Different methods of reactive dye application: Pad-batch method

Different methods of reactive dye application:

1)    Pad-batch method.

Pad batch processes are of two types-

a)    Pad (alkali)-batch (cold) process.

b)    Pad (alkali)-batch (warm or hot) process.

2)    Pad dry method

3)    Pad steam method.

1)    Pad-batch method.

a.     Pad (alkali)-batch (cold) process.

Steps:

1)    The fabric is first padded in a padding mangle with reactive dye in presence of an alkali.

2)    The padded fabric is rolled in a batch and the batches are wrapped by polyethylene sheets and stored in wet condition for 1-24 hours at 200-300C in a room.

3)    During the storage period, the rolls may be kept slowly rotating to prevent seepage of the dye liquor.

4)    After storing time is finished fabric is washed in a rope washing machine to remove the unfixed dye from fabric surface.