Method of preparing biodegradable, water-resistant, and molded p

Details Method of preparing biodegradable, water-resistant, and molded p Method of preparing biodegradable, water-resistant, and molded p

1995-11-22

1999-05-25

Lamb, Brenda A.

Paper making and fiber liberation

Processes and products

Non-fiber additive

162231, 162223, D21H 2500

Patent

active

059067136

ABSTRACT:
A method of preparing biodegradable, water-resistant, moldable paper board or molded paper utensil which includes the steps of: (a) preparing a pulp aqueous slurry at a consistency of about 4%; (b) adding surfactant selected from the group consisting of rosin soap, sodium oleate, sodium stearate, and sodium palmitate to the pulp aqueous slurry; (c) adding between 25-75% weight of a biodegradable and water-resistant agent selected from the group consisting of calcium stearate, cellulose stearate, calcium palmitate and cellulose palmitate to the pulp aqueous slurry to form a slurry mixture; (d) refining the slurry mixture at a consistency of about 4% to a desired drainage; (e) diluting the refined slurry mixture and adding thereto an aggregating agent as alum to form a furnish; (f) forming the furnish to obtain a dry moldable soft paper board; (g) preheating the moldable paper board obtained in step (f) at a temperature from 110.degree. to 170.degree. C.; and (h) hot-pressing the preheated moldable paper board obtained in step (g) in a mold at a temperature from 115.degree. to 170.degree. C. for 2 to 40 seconds to obtain a molded paper utensil.

REFERENCES:
patent: 647492 (1950-12-01), Keyes Fibre Co.
patent: 1345476 (1920-07-01), Clapp
patent: 1370650 (1921-03-01), Hoskins
patent: 1900427 (1933-03-01), Clapp
patent: 1914163 (1933-06-01), Randall
patent: 2006392 (1935-07-01), Greider
patent: 2103318 (1937-12-01), Clapp
patent: 2800945 (1957-07-01), Schilling
patent: 2877498 (1959-03-01), Schneider
patent: 3305434 (1967-02-01), Bernier

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