Albert Brucato - Seattle WA Richard J. Brooks - Seattle WA
Assignee:
The Chemithon Corporation - Seattle WA
International Classification:
D21C 502
US Classification:
162 5
Abstract:
Waste newsprint is defibered in an aqueous bath to which is added a deinking agent. The resulting slurry or pulp is rinsed, drained and formed into paper sheets. The deinking agent is a C. sub. 14 to C. sub. 20 alpha olefin sulfonate or a mixture of C. sub. 18 alpha olefin sulfonate and a non-ionic detergent, depending upon the conditions of the deinking bath.
Method Of Making Paper Having Improved Tearing Strength
The tearing strength of paper is improved by providing a furnish in which the fiber content is predominantly refined fiber with a minor amount, preferably 2 to 10 wt. %, of added unrefined fiber having incorporated therein a heat activatable bonding agent, particularly starch. The bonding agent adheres to and coats the added fiber without chemically reacting with the fiber. A cationic material, particularly polyethyleneimine, is premixed with the raw starch to cause it to adhere to the added fiber. During heat drying of the formed paper the starch is gelatinized to effect enhanced bonding of the added fiber.
Strength Of Paper From Mechanical Or Thermomechanical Pulp
An additive comprising an anionic organic surface active agent is incorporated into mechanical or thermomechanical pulp at an elevated temperature and pressure. The additive causes dispersion of lignin and retards redeposition of lignin so that the bursting strength of the paper formed from the pulp is improved. The preferred additives are higher molecular weight anionic organic polyelectrolytes or polymers, particularly polymeric sulfonates. Further improvement in bursting strength is achieved by the wet end addition of a cationic organic polyelectrolyte or polymer, with or without starch. Lower molecular weight anionic organic detergents can also be used but should be rinsed from the pulp before forming paper.
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Bayard Taylor Public School 158 New York NY 1924-1926, Robert Simon Public School 64 New York NY 1926-1929, Isaac Pitkin Public School 159 Brooklyn NY 1929-1934, Patrick Henry Public School 171 New York NY 1934-1937