SUITABLE VARIETIES:

Pure cotton or cotton fibers, pure of differential chemical fiber and blended varieties, especially suitable for spandex core-spun yarn and Siro-spinning, poly fiber spinning, magnetic properties of new type of Siro-spinning, and other varieties of compact spinning.

RECOMMENDATIONS FOR COTS GRINDING:

The purpose of cot grinding:

• .To remove at least 0.2 mm polyurethane in order to get a layer of fresh polyurethane. At the same time one should ensure not to remove more than 0.2 mm in a single cut, which may lead to excessive heat build-up particularly in hardness 50 to 65 cots.
• The Average roughness value (Ra Value) of the spinning cot measured on the cold surface should be between0.6 μm to 0.9 μm.
•  Grinding intervals should be adjusted according to the cots quality, usage period, Quality requirements and manufacturer recommendations.

To achieve the above objectives the following procedures must be adopted:

• Must be use PU special stone on customer grinding machine.
• Measure the outer diameter of the cot before grinding.
• Set the grinding machine to remove 0.2 mm from initial diameter.
• Grind the cot with a total contact time with stone of approximately 5 s in case full width stone or in case of Single or Narrow 1 inch stone 2 complete To & fro motion with minimum bed speed is recommended.
• Measure the outer diameter of the cot after grinding; it should be 0.2 mm smaller now from the initial diameter. If not, the machine must be reset to take 0.2 mm.
• .Carefully check the taper & eccentricity of freshly buffed cots with eccentricity tester and the eccentricity within single cot and difference between LHS & RHS cot should be below +/- 0.020 mm with arbors. If not adjust the stone parallelism with arbors.