Claims
- 1. A biodegradable, water-resistant paper board formed by a process comprising the steps of:
- preparing a pulp aqueous slurry at a consistency of about 4%;
- adding surfactant selected from the group consisting of rosin soap, sodium oleate, sodium stearate, and sodium palmitate to the pulp aqueous slurry;
- after said surfactant adding step, adding between 8-30% 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;
- refining the slurry mixture at a consistency of about 4% to a desired drainage;
- diluting the refined slurry mixture and adding thereto an aggregating agent as alum to form a furnish; and
- after said diluting and adding step, forming the furnish to obtain a biodegradable, water-resistant paper board through a hot pressing at a temperature from 115.degree. to 170.degree. C.
- 2. A biodegradable, water-resistant paper board as claimed in claim 1, wherein the paper board of said forming step comprises a paper utensil.
- 3. A biodegradable, water-resistant paper board as claimed in claim 1, wherein said forming step is a wet forming step.
- 4. A biodegradable, water-resistant paper board as claimed in claim 3 wherein the composition of the slurry mixture before said refining is 92-70 weight percent pulp and 8-30 weight percent water-resistant agent, based on the sum of the dry weight of pulp and water-resistant agent, and the composition of the surfactant as rosin soap is 05.-5 weight percent, of the aggregating agent as alum is 0.5-5 weight percent, based on the dry weight of pulp only.
- 5. A biodegradable, water-resistant paper board as claimed in claim 4 wherein the composition of the pulp is 15-85 weight percent bleached bagasse pulp and 85-15 weight percent nadelholtz bleached kraft pulp.
- 6. A biodegradable, water-resistant paper board as claimed in claim 4 wherein the composition of the pulp is 15-85 weight percent laubholt kraft pulp and 85-15 weight percent nadelholtz bleached kraft pulp.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation application U.S. patent application Ser. No. 08/370,489, filed Jan. 9, 1995, now U.S. Pat. No. 5,618,387 which is a continuation-in-part of U.S. patent application Ser. No. 08/174,186, filed Dec. 27, 1993, now abandoned.
US Referenced Citations (2)
Continuations (1)
|
Number |
Date |
Country |
Parent |
370489 |
Jan 1995 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
174186 |
Dec 1993 |
|