|
3.5 Cotton
It has good strength and, low extension with resistance to shrinkage .It does not melt even at high sewing rate. Abrasion resistance also found appreciable. The negative aspects of the cotton could be due to its less durable nature, weaker then the synthetic fibre made yarns and poor mildew resistance.
3.6 Polyester
Polyester has good tensile, light and heat fastness. The wet abrasion resistance and Fatigue behavior are better then Nylon. The limitation might be the melting high-speed sewing.
3.7 Polyamides
The leather industry using the Ploy amides due to its different elastic properties and the heat setting properties .The limitations are due to 10-20% strength loss when exposed with the water and Kink formation after sudden retraction.
4.0 Classifications of sewing threads
4.1 Cotton Thread
It can withstand at a high temperature then the synthetic fibre yarns .it based on the end uses classified in to three types.
4.1.1 Soft thread
Most commonly used soft threads need no special treatment. Low friction lubricant only required
4.1.2 Polished Thread (Glaced)
Starch and lubricants are coated in the soft thread with high speed polishing performed by rotating brushes to give glazed appearance. Leather and heavy fabrics need such threads.
4.1.3 Mercerized Thread
For general stitching, button holding and embroidery purposes the mercerized threads are used. Improved luster and strength add value to the sewn fabrics.
4.2 Linen Thread
Before the synthetic threads invented this stiff thread from flax used in foot wear and tarpaulin. It is sensitive to bacterial action in wet condition. Hence it needed rot proof finish.
4.3 Silk Thread
It is used in short length for pick stitching the edges of mens jackets and is more expensive garments for stitching button holes .the main feature of this type threads are the extensibility with strength (about 20%). Cost is main restriction factor.
4.4 Polyester Stable Fibre Thread
It is considered one of the best and most satisfactory performing sewing thread dueto high strength at cyclic loading, good chemical and abrasion resistance properties with dye and light fastness properties with low cost. Comparative hairiness in the thread reduces thread friction and improves the Sewability.
4.5 Nylon Thread
It is having good fibre strength to fineness ratio. Puckering may results due to unfavorable extension characteristics.
|