Process for bonding and stretching nonwoven sheet

Details Process for bonding and stretching nonwoven sheet Process for bonding and stretching nonwoven sheet

1986-02-28

1987-03-24

Lowe, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156229, 156282, 156311, 2642888, B29C 5506

Patent

active

046523227

ABSTRACT:
Fibrous polyolefin nonwoven sheets are bonded and stretched in a continuous, multiple stage process. First, the sheet is heated without significant stretching to a temperature that is close to, but below, the melting temperature of the polyolefin. Then, as the sheet is forwarded to a first stretching stage, the sheet temperature is decreased by 5.degree. to 40.degree. C. and thereafter the sheet is alternately heated and cooled as it passes through successive stretching stages, before final cooling to below 60.degree. C. In comparison to similar sheets bonded and stretched at constant temperature, the sheets produced by the process of the present invention are significantly more uniform in thickness.

REFERENCES:
patent: 3169899 (1965-02-01), Steuber
patent: 3402227 (1968-09-01), Knee
patent: 4537733 (1985-08-01), Farago
patent: 4554207 (1985-11-01), Lee

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