Lecture 4
- 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.
- 8. Fig: Taper line gratings
- 9. Crimp of yarn in the fabric • Crimp • Crimp percentage • Crimp amplitude