100% Spun Polyester threads have exceptionally high tenacity high resistance to abrasion possess good resistance to chemicals in general and are more suitable where acidic conditions apply have good sewing performance, good dimensional stability and good stitch-locking properties in the seam due to their fibrous surface.
High quality super high tenacity polyester staple fibre wrapped on continuous filament polyester yarn. The Filament polyester core provides with the strength while the spun polyester cover gives excellent sew ability.
Withdraw about 1 meter of thread from the holder in the same manner as thethread is fed to the sewing machine. Then bring the two ends together by forming a loop so that they are about 10 cm apart. Count the number of turns in the loop. This gives an indication about the twist balance of the thread. An ideally balanced thread will not form twist in the loop. However, practically a thread is considered balanced if the number of turns are up to 7.The above exercise should be carried out in the absence of any air current.
The hairiness index given by the uster tester 3 is defined as he total length in cm,of the protruding fibers over the measurement field of 1 cm.The hairiness index H is the ratio of two lengths and hence dimensionless. Wrap the thread on the contrast thick paper/board (white paper for dark shades and black one for lighter shades). A more hairy thread will give a hazy appearance while a thread with less protruding hairs will give a neat appearance.
It is required :
To reduce co-efficient of friction in sewing thread.
To minimize the heat generated during high speed stitching operation.
To enhance the gliding property of sewing thread.
- Wrong thread selection for the application.
- Quality defects in the thread.
- Improper needle & thread size relationship.
- Excessive machine thread tension.
- Improper threading.
- Defective/ Worn-out needle.
- Improper positioning / seating of the needle.
- Needle heat.
- Worn or defective thread guides or eyelets.
- Any other worn-out contact points.
- Disturbed machine settings.
- Improper feeding of fabric.
- Improper operator handling.