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Drafting system

Drafting system. How much no of roller and how it way arranged is known as drafting system. Conventional drafting system: 4 over 4 without apron SKF PK 1500 Modern drafting system with apron SKF PK 1600. Apron.

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Drafting system

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  1. Drafting system How much no of roller and how it way arranged is known as drafting system. Conventional drafting system: 4 over 4 without apron SKFPK 1500 Modern drafting system with apron SKFPK 1600

  2. Apron Aprons are made of either leather or more commonly of endless synthetic sheet. It may be short or long and thickness of about 1mm.

  3. Apron

  4. Roller pressure arrangement system By dead wt. and hook arrangement. By spring (mostly used) By pneumatic system. Advantages of pneumatic pressure: a) Easy adjustment b) Uniform pressure from arm to arm. c) Pressure range : 1.5 – 5 Bar

  5. Spacer The function of spacer is to space between two aprons. Different size of spacers are of different color . Roving hank Spacer size (mm) Below 1 7 1-2 5 2-3 4.5 Above 4

  6. Roller hardness The hardness of rubber coating around the top roller is called roller hardness. Roller hardness depends on Fiber Pressure Strand thickness Roller hardness is expressed by degree. Hardness is tested by roller harness tester. For simplex machine the range of hardness is 70°- 80°

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