Claims
- 1. A method for the preparation of waste paper, said method comprising the steps of:
- (1) providing impregnating means for impregnating said waste paper with chemicals suitable for decomposition of said waste paper into a waste paper pulp;
- (2) introducing said waste paper to said impregnating means;
- (3) impregnating said waste paper with chemicals in said impregnating means;
- (4) providing a storage tank having an upper part, a lowest part including a pulping region, slushing rotor means for rotating and, simultaneously, vigorously and extensively breaking up the waste paper pulp in the pulping region of the lowest part, said slushing rotor means including a single slushing rotor having a vertical shaft for both rotating and breaking up said waste paper pulp, means for introducing diluting fluid to the lowest part of said storage tank, and means in said pulping region for separating diluted waste paper pulp into a clean accept fraction and a fraction which is unstrained and enriched with dirt;
- (5) communicating the waste paper pulp having a consistency of between 15% and 30% from said impregnating means to the upper part of said storage tank;
- (6) retaining said waste paper pulp in said storage tank for a period of approximately 2 to 3 hours;
- (7) diluting said waste paper pulp in the lowest part of said storage tank with a fluid;
- (8) rotating and, simultaneously, vigorously and extensively breaking up said waste paper pulp over the entire cross-section of the pulping region of the lowest part of said storage tank with said slushing rotor means;
- (9) separating said diluted waste paper pulp in said pulping region into a clean accept fraction and a fraction which is unstrained and enriched with dirt;
- (10) providing means for removing from the pulping region a fraction of said diluted paper pulp which is unstrained and enriched with dirt;
- (11) removing an unstrained and dirt-enriched fraction of said diluted paper pulp from the pulping region;
- (12) providing means for screening of diluted waste paper pulp; and
- (13) screening said removed pulp fraction in said screening means to recover the pulp fiber content.
- 2. The method for the preparation of waste paper as claimed in claim 1 wherein said impregnating means includes a rotatable drum with a drum axis inclined at less than about 40.degree. from horizontal, said impregnating being provided by rotating said waste paper in said drum.
- 3. The method according to claim 1 further comprising the step of rotating the waste paper pulp in the lowest part of the tank at a diluted consistency of between 4% and 7%.
- 4. The method for the preparation of waste paper as claimed in claim 1 further comprising sorting said waste paper for the removal of cord and twine prior to impregnating with chemicals.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3522395 |
Jun 1985 |
DEX |
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Parent Case Info
This is a continuation application Ser. No. 872,117, filed June 9, 1986, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3311082 |
Sep 1984 |
DEX |
52-703 |
May 1978 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
872117 |
Jun 1986 |
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