Coating selective zones of thin webs to change the pervious char

Details Coating selective zones of thin webs to change the pervious char Coating selective zones of thin webs to change the pervious char

1997-07-28

1999-03-23

Beck, Shrive

Coating processes

Nonuniform coating

Mask or stencil utilized

427210, 427211, 427314, 427286, 427288, 427428, 118258, 118213, B05D 132, B05D 128

Patent

active

058856560

ABSTRACT:
The process and apparatus of the present invention teaches how to treat a well-integrated woven or non-woven web of hydrophobic fibers to make selective areas hydrophyllic. It also can be used to make a web of hydrophyllic fibers selectively hydrophobic. It uses a plurality of selectively adjustable covers on an applicator roll rotating in a bath of liquid to place the liquid material on selective areas of the moving web. In a preferred embodiment the web is non-woven and the fibers are hydrophobic in nature, e.g., dry-laid or melt-blown polypropylene or polyethylene fibers or spun-bonded hydrophobic filaments. A woven web made of cotton or other hydrophyllic fibers may also be used if the end result is to create partially hydrophobic areas on a hydrophyllic web. The areas of liquid are positioned on the web only where desired so as to eliminate the excessive cost of unwanted and unnecessary coating material. If the web is hydrophobic, the liquid makes that area hydrophyllic. If the web is hydrophyllic, the liquid makes that area hydrophobic.

REFERENCES:
patent: 3844813 (1974-10-01), Leonard et al.
patent: 4075382 (1978-02-01), Chapman et al.
patent: 4551377 (1985-11-01), Elves et al.
patent: 4778460 (1988-10-01), Braun et al.
patent: 4865886 (1989-09-01), Itoh et al.
patent: 5478628 (1995-12-01), Billingsley et al.

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