Monthly Archives: March 2012

Jute Fabric Printing With Basic Dyes | Eco Friendly Jute Products

Jute is a natural bast fiber. Jute fiber is spun for producing jute yarn. Various types of jute fabrics are made from jute yarn. We know that, jute fabric is classified as Sacking, Hessian and C.B.C. Jute fabrics are courser than cotton or other fabrics. For this reason it’s using are not so wide as compared to cotton or other fabrics. For this reason different types of attributes are added with jute fabric for make it user friendly. Now a day’s jute dyeing and jute printing becomes popular to the manufacturer.

The printed jute product which is presented here, it is produced in Star Jute Mills Limited which is an enterprise of Bangladesh Jute Mills Corporation. They also produced all types of Sacking and Hessian jute products which maintain international quality standard.

Jute printing is the process of producing different types of attractive design to the jute fabric. I have described about the printing classification. Among the entire printing process block printing is popular for jute fabric printing.

Materials for jute fabric printing: During jute fabric printing following materials are used.

  • Basic dyes
  • Acetic acid
  • Starch
  • Water
  • Block
  • Soft surface
  • Jute fabric

We know that; basic dyes are usually hydro-chloride or salts of organic bases. Basic dyes are insoluble in water but it can be soluble in alcohol or methylated spirit. Its fastness properties are average to good. This is cheap in price and available in the market.

Jute fabrics are print by the basic dyes. Basic dyes printing are carried out in acidic medium. Jute printing can be run by the following recipe:

Basic dyes                               : 30gm/kg

Acetic acid                              : 50gm/kg

Thickeners (Starch 10%)            : 700gm/kg

Water (+,-)                              : 220gm/kg

This recipe is a sample recipe but this amount could be changed. Anyhow, this recipe is calculated for making 1kg print paste.

Sequence of application: Basic dyes printing is carried out as the following sequence.

Fabric pre-treatment

Printing (Block)

Steaming

Drying

After treatment

This is the basic process flow chart of jute printing with basic dyes. During printing process different caution is follow for avoiding printing faults. Before starting printing we should make a printing paste with standard recipe. Block should place in the right place. For a multiple color printing we have to print one by one by specific block. Printing place should be soft. After printing; steaming should be for fixing the dyes uniformly. Stemming also increase the stability of the printing paste. Drying is must after printing. Sometimes after treatment is carried out.

So, print your jute product with basic dyes and make different types of attractive design to attract the buyer.

Dyeing Sequence of 100% Cotton for Medium and Dark Shade | Yarn Dyeing Process

In dyeing; process sequence can be vary depending on the shade of the material which is required to produce. I have given a process sequence for the light shade dyeing but basic sequence is almost same. Now I like to give a process flow chart of dyeing for medium and dark shade.

Carrier and vessel washed by hydrose and caustic at 1000 C for 20 min

Load the package in the carrier and feed in the vessel

Add wetting agent, antifoaming agent, sequestering agent and run at 600 C for 10 min

Water solution drain

Add wetting agent, sequestering agent, caustic soda and hydrogen peroxide and run at 1100 C for single yarn and 1150 C for double yarn for 20 min

Drain

Add peroxide killer and run at 900 C for 10 min

Peroxide check in the package

Drain

Add acetic acid for neutralization and run for 20 min at 500 C

Drain

Absorbency test of sample

Ok

Dyeing period

Add salt, wetting agent, antifoaming agent, sequestering agent and run at 600 C for 10 min

PH check

Color dosing at 600 C for 30 min

Color migration at 600 C for 30 min

Migration package check

Ok

Run the machine for 20 min at 600 C with color and salt

Soda dosing at 600 C for 40 min

Cotton dyeing at 600 C for 50 min

Check sample

Ok

Drain

Rinse for 10 min

Add acetic acid for neutralization and run for 10 min at 500 C

Drain

Add washing chemical and run at 950 C for 20 min

Add washing chemical and run at 900 C for 20 min

Wash sample check

Ok

Drain

Rinse for 10 min

Add fixing chemical and half acetic acid, run at 500 C for 20 min

Add softening agent and rest half acid, run at 600 C for 20 min

Check finished sample

Ok

Drain

So, If anyone wants to get the prove, he can apply this technique in yarn dyeing process for producing medium and dark shade on 100% cotton. Please, let me know the results.

Quality Assurance System at Different Stages of Yarn Dyeing | Quality Measuring System

In every production floor there have a quality department which is responsible for ensuring the quality of the product. In yarn dyeing floor there have a quality department. Textile engineer or a quality officer measures the quality of the product by carrying different quality test.

The value of a product is depends on the quality. Different types of qualities are checked for various products. For yarn dyeing floor; the quality of the dyed yarns are measured as the following flow chart:

Dyed yarn from production section with batch card

Yarn dried by passing it hydro extractor and dryer

Take six layer of a package in random section

Determine the levelness of yarn package (Single yarn)

Take knitting of a package as the sequence (outer + middle + inner) for double yarn

Match the layer and knitting with the standard swatch

Ok

Approved from Q.C

Take wash and rubbing fastness report

Ok

Approved from Q.C

Take pass or fail report from data color

Ok

Approved from Q.C

Product is ready for delivery

In dyeing; different types of dyeing faults could be happened. It is the responsibility of a quality officer to find it out and gives the solution to remove that’s faults. After passing the all types of quality test, a product becomes ready for the delivery.