Combing ring for an opening roller of an open-end spinning...

Details Combing ring for an opening roller of an open-end spinning... Combing ring for an opening roller of an open-end spinning...

2005-07-26

2005-07-26

Calvert, John J. (Department: 3765)

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

C057S112000

Reexamination Certificate

active

06920747

ABSTRACT:
A combing ring for an opening roller of an open-end spinning arrangement is provided with at least two surface coatings, one applied on top of the other. Of these two coatings, the bottom one is a wear-resistant, harder PVD coating, while the upper one is a less hard, but fiber-friendly coating having a maximum thickness of 5 μm, preferably a chemical nickel coating. The bottom PVD coating comprises in a known way so-called droplets, whereby the thickness of the top coating is at least equal to the height of the droplets.

REFERENCES:
patent: 5164236 (1992-11-01), Schmid
patent: 6228483 (2001-05-01), Sarin
patent: 40 08 637 (1991-09-01), None
patent: 41 01 680 (1992-07-01), None

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