Excellent Stability to Enable High-Speed Production in Specific Operating Condition.

POLYURETHANE ROLLERS ADVANTAGES:

  • Polyurethane roller has extremely good flexibility, surface hardness of 55-90, elasticity values are 3-5 times more of traditional roller.
  • Has an excellent wear resistance and deformation during the use of extremely small and durable, wear long service life more than4 to 5 years.
  • A good winding resistance performance can be adapted to workshop of sudden changes in temperature and humidity in the absence of air conditioning facilities even under normal production.
  • No need painting sets up two reciprocating grinding machine, spinning is strong, stable, and is a real non- surface treatment cots.
  • Come into contact with oils, have a good compatibility; oil acid and alkali-resistant but not swollen, ensure consistent hardness, deformation.
  • Anti-pollution, environmental performance, it’s not hygroscopic. Are energy saving and consumption reduction in the textile industry, improve quality of products.

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.

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