Method of perforating a nonwoven web and use of the web as a cov

Details Method of perforating a nonwoven web and use of the web as a cov Method of perforating a nonwoven web and use of the web as a cov

1988-08-11

1989-12-12

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

156252, 156513, 264154, 264163, 425290, 425369, B28B 316, B28B 148, B32B 3116

Patent

active

048866326

ABSTRACT:
A method of perforating a nonwoven web of fibrous fabric by directing the web through a nip defined by first and second moveable members. As the web moves through the nip it is penetrated by a plurality of heated pins projecting from the first member which enter heated apertures formed in the second member. The penetration of the pins causes the fibers of the fabric to separate and enter into the apertures and form openings through the web. The openings are surrounded by dense consolidated rings exhibiting greater hydrophilic properties than the nonperforated surface of the web.

REFERENCES:
patent: 2633441 (1953-03-01), Buttress
patent: 2748863 (1956-06-01), Benton
patent: 3137893 (1964-06-01), Gelpke
patent: 3403681 (1968-10-01), Hoey et al.
patent: 3965906 (1976-06-01), Karami
patent: 4079739 (1978-03-01), Whitehead
patent: 4128679 (1978-12-01), Pohland

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