Process for producing nonwoven fabrics with steam pretreatment of binder powder
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United States of America Patent
Stats
-
Apr 9, 1991
Grant Date -
N/A
app pub date -
Sep 18, 1989
filing date -
Sep 16, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Nonwoven fabrics are produced by mixing fibers especially textile fibers with binder powders, and by bonding the fibers and binder powders in twin-platform belt ovens for heating the powder. During this step, air is passed through the nonwoven mat or web or interlocked fibers. In order to avoid contamination of the oven with binder powder fragments detached from the nonwoven fabric, the provision is made to arrange a steaming process upstream of the air heat treatment process. The steam is to condense on the fibers or on the binder powder and to promote sticking of the powder to the fibers of the nonwoven fabric. Advantageously, a sieve drum device is employed in place of the twin-platform belt oven for the final bonding heat treatment; this device can operate herein in a much more economical fashion than the oven.
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