Back to results
US 4,482,429 AGranted
Paper webs having high bulk and absorbency and process and apparatus for producing the same
AssigneeJames River-Norwalk, Inc.
InventorBernard G. Klowak
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeJames River-Norwalk, Inc.
InventorBernard G. Klowak
Estimating the term…
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.
A paper web product comprising a web of kraft fibers bonded together solely by natural hydrogen bonding between the fibers and with debonding agent mixed therein, and having a basis weight of at least 13.77 pounds per 3,000 square feet, a machine direction tensile strength of at least 34 grams per centimeter, a cross direction tensile strength of at least 12 grams per centimeter, a caliper for 8 plys as measured under 26.6 grams per square centimeter pressure of at least 1.15 millimeters, an oil holding capacity of at least 5.9 milliliters per gram, the web made by the process of:
A paper web product comprising a web of kraft fibers bonded together solely by natural hydrogen bonding between the fibers and with debonding agent mixed therein, and having a basis weight between 13.77 and 16.10 pounds per 3,000 square feet, a machine direction tensile strength of between 34 grams per centimeter and 78 grams per centimeter, a cross direction tensile strength of between 12 grams per centimeter and 27 grams per centimeter, a caliper for 8 plys as measured under 26.6 grams per square centimeter pressure of between 1.15 millimeters and 1.37 millimeters, an oil holding capacity of at least 8 milliliters per gram, the web formed by
A paper web product comprising a web of kraft fibers bonded together solely by natural hydrogen bonding between the fibers and with debonding agent mixed therein, and having a basis weight between 29.89 and 31.18 pounds per 3,000 square feet, a machine direction tensile strength of between 66 grams per centimeter and 134 grams per centimeter, a cross direction tensile strength of between 27 grams per centimeter and 46 grams per centimeter, a caliper for 8 plys as measured under 26.6 grams per square centimeter pressure of between 2.01 millimeters and 2.38 millimeters, an oil holding capacity of at least 5.9 milliliters per gram, the web formed by
Dependencies are inferred from the claim text.