Tag Archives: Wet processing Technology

Process Sequence Of Removal Softener Spots From The Dyed Fabric

Removal of softener spot from the Fabric is a washing process, which is done in the dyeing bath. Softener spot is a dyeing fault which is occurred during the application of softener to the fabric in dyeing bath or de-watering machine. When this type of fault is found in a dyed fabric then it needs to make free the dyed fabric from the softener spots.

Generally, acid wash is done for removing softener spot from the fabric. It is an off line quality assurance system. When this type of fabric faults found in the finishing section then it sends for acid wash in the dyeing section. By the following way, softener spot can be removed from the dyed fabrics.

Dyed fabrics are supplied to the dyeing section

Required amount of water filled

Fabric was loaded and run for 10 min.

Drain

Required amount of water filled

Acetic acid was added for 5 min.

Wetting agent added for 5 min.

Run for 10 min. at 700 C

Rinse for 15 min.

Drain

Required amount of water filled

Acetic acid added for PH– controlled

Check PH at 4.5

Enzyme added

Run for 1 hrs

Shade check

Rinsing for 10 min.

Anti-crease was added for 5 min.

Leveling agent added for 5 min.

Run for 20 min at 800 C

Rinsing for 10 min.

Acetic acid added for PH– controlled

Check PH at 6.5

Softening agent injected

Run for 10 min. at 500 C

Unload the Fabric

Quality control department of the industry should be aware about the dyeing faults and give proper decision to remove the faults.

Process Flow Chart Of Stripping In Dyeing | Cotton Knit Fabric Re-Process

Knit Dyeing is a critical procedure and it is required to match the shade of the dyed fabric with the buyer’s approved swatch. Sometimes, it is found that the dyed fabric shade does not match with the approved swatch then this fabric is required to re dyeing. This re dyeing process is called stripping. Most of the time, black shade or deep shade is produced by the stripping process. Topping is another re dyeing process but stripping and topping is use for different case.

Stripping sequence of knit cotton fabric: Reactive dyes dyeing process is done for cotton or cellulosic fiber. Here, I have given a stripping process for the cotton fabric.

Fabric received from the batching section

Required amount of water was taken into the machine

The fabric was loaded and run for 5-10 minutes in normal temperature

 Wetting agent, anticreasing agent were added at a time for 5 minutes

Caustic was dosing at normal temperature for 5 minutes

Run for 10 min.

Temperature increase at 1100C and continue for 40 min.

Cooling at 800C

Hydrose inject for 5 min.

Temperature increased at 1100C for 10 min.

Run for 30 min.

Cooling at 800C

Sample check

Rinsing for 15 min.

Hot wash

Cold Wash

Unload the Fabric

Stripping is done on the dyed fabric for this reason this type of re-dyeing increases the cost of the dyeing process.

Process Sequence Of Topping For Cotton fabric | Dyes Adding Process

Topping is defined as the addition of color to the fabric after completing one dyeing process. Sometimes it is found that the dyed fabrics do not match with the standard or buyer approved swatch then it needs to re dyeing, this process is called topping. Tipping sequence is near similar as the full dyeing sequence.

Generally, topping is done for the cotton fabric which is dyed by the reactive dyes. Here, I have given a topping process sequence on the cotton fabric which is dyed by the reactive dyes.

Required amount of water filled

Fabric was loaded and run for 10 min.

Drain

Required amount of water filled

Acetic acid was added for 5 min.

Temperature increased at 600 C

Run for 20 min.

Rinsing for 10 min.

Drain

Require amount of water filled

Wetting agent was added

Temperature increased at 950 C

Run for 30 min.

Ringing for 20 min.

Leveling agent added for 10 min.

Salt dosing

Color dosing for 30 min

Run for 10 min

Soda dosing

Run for 1 hrs

Temperature increase at 600C for 5 min

Run for 10 min

Shade check (OK)

Rinsing for 20 min.

Drain

Acetic acid was added for neutralization for 10 min

Shade check (ok)

Hot wash at 700C

Rinsing for 10 min.

Fixing agent was added for 10 min

Rinsing for 10 min.

Water was filled at required amount

PH check at 5.5

Softener was added

Final shade checks and run for 20 min

Unloading the dyed fabric

After completing a dyeing process, shade of the dyed fabrics are checked by the quality control department. If the shade of the dyed goods does not match with the buyers approved swatch then they give decision for topping or stripping.

Topping is an additional process which add extra dyeing cost on the dyeing process. So, a textile engineer should be aware about the dyeing of the fabrics.