Process for making soft, strong cellulosic sheet and products ma

Details Process for making soft, strong cellulosic sheet and products ma Process for making soft, strong cellulosic sheet and products ma

1987-03-05

1989-01-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162112, 162113, 162158, 162184, 162186, D21H 524

Patent

active

047955309

ABSTRACT:
A process for making a soft, strong cellulosic sheet weighing from about 2 to about 15 pounds per 2880 sq. ft., comprising selectively treating a face surface of a cellulosic fibrous web with a dilute aqueous solution of a chemical debonding agent in an amount effective to soften a surface zone of the web proximate the treated face surface, whereby a composite strong zone/soft surface zone structure results, with the soft surface zone thereof including the treated face surface and being from about 10 to about 40% of the total thickness of the web, and with the strong zone being effectively untreated by the agent. The cellulosic sheet made by this process is characterized by a strong inner surface zone of from about 50 to about 90% of the total thickness of the sheet, and a soft and pleasing-to-the-touch outer surface zone comprising the remainder of the thickness of the sheet.

REFERENCES:
patent: 3014832 (1961-12-01), Donnelly
patent: 3556931 (1971-01-01), Champaigne

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