Method for applying binding agents to fibrous webs

Details Method for applying binding agents to fibrous webs Method for applying binding agents to fibrous webs

1982-07-21

1983-05-31

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

118410, 15624424, 15624427, 156285, 156500, 264518, 425113, 425516, B29D 2700, B29J 500

Patent

active

043859542

ABSTRACT:
A method and system for applying a foamed binding agent to a fibrous web is disclosed. The invention is characterized by the use of an extruder having an upper lip extending 1/16 to 1/4 inch beyond the lower lip, and by the drawing of a vacuum beneath the applied foam, said characteristics being critical to the formation of a uniform foam layer atop the web. A second, more substantial vacuum is then applied beneath the web to essentially completely draw the binding agent into the web thereby providing substantial inter-fiber bonding.

REFERENCES:
patent: 3042573 (1962-07-01), Roberts
patent: 3043738 (1962-07-01), Demeter et al.
patent: 3331728 (1967-07-01), Lave
patent: 3348989 (1967-10-01), Roberts
patent: 3600750 (1971-08-01), Stroszynski
patent: 3609810 (1971-10-01), Coghill
patent: 4159355 (1979-06-01), Kaufman
patent: 4292271 (1981-09-01), Buob et al.
patent: 4332756 (1982-06-01), Bean et al.

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