Effect of cold enzyme washing on physical and mechanical properties

of cotton-tencel denim fabrics

Supervisor: Prof. changhai YiPrepared by:

Rajib Chandra Gosh

Introduction

• Tencel fiber has been reinvented by denim designers as the perfect complement to today’s fashion trends.

• jeans with tencel fibre are attractive, durable and become immediate favorites thanks to their enhanced comfort.

• The key performance criterion of cotton-tencel denim fabric is moisture management which determines the comfort level.

• The removal of the surface fibrillated hairs from cotton-tencel denim fabrics by cold enzyme can be effected , with minimal effect on the bulk of the fabrics.

• Vintage look of denim fabric is very fashionable and it is the main attraction of young generation

• Industrial washing is one of finishing method of garments such as jeans which is mostly used in textile industry

• with the advent of technologies and equipment to get over dyed-look, damaged-look, scrubbed-look

Denim washing

Denim washing is the aesthetic finish given to the denim fabric to enhance the appeal and to provide strength.

There are two types of denim washing :1. Wet process 2. Dry process

Wet process of denim

There are many kinds of wet process:• Rinse wash• Enzyme wash• Enzyme bleaching wash• Softeners wash• Acid wash• Rubber ball wash• Resin wash• Garments wash

Enzyme wash

• Enzyme washing is a laundering process that uses enzymes to

clean clothing or to finish cotton.• In the case of jeans and other

garments with a worn in look

Conventional enzyme wash

Working condition:

• Temperature= 45-50c• Time =30-35• Ph = 4.5-5

Why cold enzyme washing

Reasons for using cold enzyme wash:• Time consumption• Temperature saving• Eco-friendly

Cold enzyme wash

• Working condition:• Temperature = 20-35°c• Time =20-35 minute• PH = 4- 4.5

Cold enzyme washing

Flow chart of denim washing by cold enzyme :Desizing(60 °C ,20 MIN with water) Rinse wash(5”×2) Cold enzyme wash Rinse wash ( 2 times) Drain

Front loading machine

Working condition

SAMPLE TIME TEMPERATURE1 20 34

2 18 32

3 15 29

4 10 28

Determination of weight lossSamples no Before wash (gm.) After wash(gm.) Weight loss%

Sample 1 267 268 -0.3%

Sample 2 274 274.5 -0.2%

Sample 3 247 246.5 0.2%

Sample 4 254 256 -0.7%

k/s valueSamples After ( cold enzyme wash) Before wash

1 15.018 16.599

2 15.301 16.888

3 15.400 16.522

4 15.428 16.578

GSM Change

Color fastness to rubbing

Wicking test

Need to test

• Tensile strength• Thickness• Air permeability• Pilling• Tearing strenght• SEMEtc………………………

Thank you very much