Thread density measurement theorem

1. Lecture-4

2. Thread Density
• Fabric specification
(EPIXPPI / Warp Count X Weft count)X FW
Methods of measuring Thread Per Inch:
1. One inch counting glass.-a simple
microscope.
2. Traversing thread counter –a travelling
microscope fitted with a pointer to aid
counting

3. Fig: Traversing thread counter

4. • The Traverse Thread Counter consists of traveling
microscope fitted on basic plate having a
translucent plastic panel illuminated from below.
The viewing arrangement consists of the
microscope fitted on a traveling carriage which
can be moved over two rods with the help of a
screw. The microscope has a 10 x eye piece, and
achromatic object glass.
The fabric to be tested is placed on the
translucent panel, and a built in swiveable gauge
having openings of different lengths is lowered
over it. The total number of threads in the fabric
in any one opening is counted by manually
operating a stroke counter fitted on the
apparatus .

5. 3.Fabric dissection.
4.Parallel line gratings –a rapid optical method.
5.Taper line gratings.

7. Fig: Lunometer

8. Fig: Taper line gratings

9. Crimp of yarn in the fabric
• Crimp
• Crimp percentage
• Crimp amplitude