Methods of applying bonding materials onto fibrous webs

Details Methods of applying bonding materials onto fibrous webs Methods of applying bonding materials onto fibrous webs

1979-12-28

1981-09-29

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Bulk deposition of particles by differential fluid pressure

264113, 264128, B29J 500

Patent

active

042922712

ABSTRACT:
Methods by which a dry-formed loose fibrous web is bonded by applying to one of its surfaces a low add-on level of a relatively high binder solids concentration bonding material to form a once-bonded web, and to the other side of the web, a greater add-on level of a relatively lower solids concentration bonding material, the first-applied emulsion preferably adding from about 20% to about 40% binder solids by weight, and the second-applied adding the rest of the total binder solids to be included in the fibrous web product. The bonding material can be a solution or emulsion. Preferably, the first and second-applied bonding materials are water-based latex emulsions, the solids concentration of the first-applied emulsion is from about 15% to about 25% by weight, that of the second-applied emulsion is from about 10% to about 20% by weight based on the total binder solids to be included in the fibrous web product, and a vacuum draws the second-applied bonding material into the web.

REFERENCES:
patent: 3515609 (1970-06-01), Rudloff
patent: 4155968 (1979-05-01), Yamamoto
patent: 4165352 (1979-08-01), Volkman

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