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US 5,292,389 AGranted
Process for producing nonwoven fabric
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsIssei Tsuji, Hideki Harada, Masato Doi
Life of this patent
Estimating the term…
Abstract
A process for producing a nonwoven fabric having the steps of: bonding polypropylene long-fibers constituting main fibers of the web to one another to produce a raw nonwoven fabric; and uniaxially drawing the raw nonwoven fabric at certain draw temperatures and draw magnifications to produce a final nonwoven fabric.
Claims11
A process for producing a nonwoven fabric by the uniaxially drawing of a web made of continuous long-fibers, said process comprising the steps of:
- bonding polypropylene long-fibers making up main fibers of the web to one another at an index of birefrigence of 0.02 or less to produce a raw nonwoven fabric;
- and
- uniaxially drawing the nonwoven fabric at a draw temperature of 80.degree.-130.degree. C. and a draw magnification of 1.5-2.5 to produce a final nonwoven fabric.
Dependencies are inferred from the claim text.