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Lecture 4

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Tanvir Alam

1. There are several methods for measuring thread density in fabrics, including using a one inch counting glass, a traversing thread counter microscope, fabric dissection, and optical methods using parallel or taper line gratings. 2. The traversing thread counter consists of a traveling microscope on a plate that can measure threads in a fabric sample placed on a transparent panel using a built-in gauge and stroke counter. 3. Other factors like crimp, crimp percentage, and crimp amplitude are additionally used to characterize yarns in fabrics.

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Lecture-4
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
Fig: Traversing thread counter
• 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 .
3.Fabric dissection. 4.Parallel line gratings –a rapid optical method. 5.Taper line gratings.
Lecture 4
Fig: Lunometer
Fig: Taper line gratings
Crimp of yarn in the fabric • Crimp • Crimp percentage • Crimp amplitude

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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
  • 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