Sulfite process for making pulp having a tactile softness from h

Details Sulfite process for making pulp having a tactile softness from h Sulfite process for making pulp having a tactile softness from h

1985-08-14

1987-01-06

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 86, D21C 306

Patent

active

046344993

ABSTRACT:
Pulps having a tactile sense of softness which are made from hardwoods and processes for making such pulps. The process comprises the steps of: providing hardwood chips having specified sizes; introducing the chips into a digester; removing substantially all the free oxygen from the chips within the digester; providing a cooking liquor comprising from about 0.4% to about 3% ammonia and from about 9% to about 14% sulphur dioxide; completely submerging in cooking liquor all the chips within the digester; sulfonating the lignin within the chips at a temperature of less than about 110.degree. C.; rapidly increasing the temperature to an appropriate hydrolysis temperature; hydrolyzing the lignin sulfonation products at a temperature of from about 140.degree. to about 155.degree. C. at a pH from about 2 to about 3; and rapidly reducing the temperature of the system following the hydrolysis. Pulps made by this process were made into useful tissue paper webs having enhanced softness properties.

REFERENCES:
patent: 1830421 (1931-11-01), Bradley
patent: 2640774 (1953-06-01), Ross et al.
patent: 2885317 (1959-05-01), Collin et al.
patent: 4259147 (1981-03-01), Gordy
Butko; Abstract A.B.I.P.C., vol. 45, No. 6, Dec. 1974, #5925(u) p. 606.
Parfenova; Abstract A.B.I.P.C., vol. 41, No. 6, Dec. 1970; #5374; p. 522.

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