Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1982-09-29
1984-11-13
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162112, 428153, D21H 524
Patent
active
044824297
ABSTRACT:
Paper webs are produced in a modified conventional felted wet press process in which the fiber furnish has a chemical debonding agent added thereto in high concentrations. The web (17) is formed on a conventional Fourdrinier wire (12), transferred to a moving felt (19) which presses the web against the surface of a drying cylinder (23) to reduce its water content, and is carried by the surface of the drying cylinder (23) to a creping blade (24). Liquid adhesive is applied to the surface of the creping cylinder (23) adhead of the contact with the web to provide substantial adherence of the web to the creping surface at the point of contact with the creping blade. The levels of addition of debonding agent to the pulp furnish and the amount of adhesive applied to the creping surface are selected such that the adhesion of the web to the surface at the creping blade is greater than the internal cohesion of the web. Under these conditions, a highly bulked and internally delaminated web is produced which has bulk and absorbency superior to products ordinarily produced in the conventional wet press process. The bulk and absorbency of the finished web may be further enhanced by utilizing a reverse angle creping blade (24) which meets the surface of the creping cylinder (23) at a cutting angle not more than 70.degree. and preferably between 52.degree. and 64.degree.. The reverse angle blade causes the fibers in the web to reverse direction at the line of contact with the creping blade and therefore enhances the disruption of fiber bonds to increase bulkiness.
REFERENCES:
patent: 3301746 (1967-01-01), Sanford et al.
patent: 3994771 (1976-11-01), Morgan et al.
patent: 4309246 (1982-01-01), Hulit et al.
Chin Peter
James River--Norwalk, Inc.
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