Types of sizing | Faults in Sizing

On the basis of size percentage on yarn, sizing is classified into 4 types.

Techniques of sizing:

1. Hot melt sizing

2. Solvent sizing

3. Foam sizing

4. High pressure sizing

5. Electrostatic sizing

6. Emulsion sizing

Sizing machines:

1. Cylinder drying

a) Two cylinder types

b) Multi cylinder types

2. Hot air drying

3. Combined hot air and cylinder type

Size take-up:

The amount of size added on the yarn surface is called as size add-on.

Factors influences size take-up%:

• Hairiness of yarn increases: size take up% increases

• Immature fiber leads to increase in size take up%

• Coarser yarn: size take up% increases

• Finer yarn: size take up% decreases

• Ends per inch increases : size take up% increases due to density.

• Wet ability increases: size take up% increases due to moisture absorption

• Uniform yarn: size take up% decreases

• Warp tension increases: size take up% decreases

• Size concentration increases: size take up% increases

• Squeezing roller wt. increases: size take up% increases

• Roller diameter increases: size take up% increases

• Running speed increases: size take up% decreases

• Yarn contact in size increases: size take up% increases

Faults in sizing: