Apertured nonwoven fabrics and methods of making the same

Details Apertured nonwoven fabrics and methods of making the same Apertured nonwoven fabrics and methods of making the same

1974-06-12

1976-01-13

Padgett, Benjamin R.

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

19161P, 28 76R, 264 88, 264168, B29C 2300, D04H 1100

Patent

active

RE0286800

ABSTRACT:
Apertured nonwoven textile fabrics comprising polyvinyl alcohol fibers and having a predetermined pattern of fabric apertures and fiber bundles created by applied fluid forces; and methods of making the same which comprises: chemically treating and modifying heat-sensitive, water-soluble polyvinyl alcohol fibers to (a) raise their wet softening temperature whereby they are essentially wet heat-insensitive up to a temperature of at least about 150.degree. C. and (b) give them an average degree of acetalization of from about 20 mol percent to about 35 mol percent whereby they develop the necessary balance of hydrophobic-hydrophilic properties and are sufficiently water-insensitive and water-insoluble as to be capable of controlled movement and manipulation by applied fluid forces; forming a cohesive fibrous web from said heat-insensitive, water-insoluble fibers; and applying fluid forces to said fibrous web to move and rearrange said heat-insensitive, water-insoluble fibers into a predetermined pattern of fabric apertures and fiber bundles constituting an apertured nonwoven fabric.

REFERENCES:
patent: 2749208 (1956-06-01), Cline
patent: 2862251 (1958-12-01), Kalwaites
patent: 2977183 (1961-03-01), Osugi et al.
patent: 3167383 (1965-01-01), Chezand et al.
patent: 3512230 (1970-05-01), Luzzatto
patent: 3563241 (1971-02-01), Evans

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