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Coating techniques to improve performance of automotive fabrics

15
Feb '10
Automotive fabrics are coated for a number of reasons, the two most important being to improve abrasion resistance and secondly to confer some flame-retardancy (FR) properties. Higher the amount of coating applied results in better the barrier properties.

Sometimes extra cross-linking agents, wetting agents and other specialist additives are also included. The compound is mechanically foamed by high speed agitation and air pumped in to give a foam of a predetermined density usually about O.2g/cm3.

This compound is pumped on top of the fabric reverse side up, in front of a doctor blade in front of a stenter. This particular method of fabric coating is referred to as the 'direct method' and there are a number of variations.

This method is excellent for applying relatively low add-ons of resin, say up to about 30-40g/m2. When much heavier weights need to be applied, the compound is not foamed but thickened with a thickening agent.

This has the same effect as foaming, allowing the resin to sit on the surface of the fabric without sinking in, and penetrating to the face side.

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Fibre2fashion News Desk - India


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