Title:
METHOD OF PULPING WASTE PRESSURE-SENSITIVE ADHESIVE PAPER
Document Type and Number:
WIPO Patent Application WO/1992/007137
Kind Code:
A1
Abstract:
A method of obtaining regenerated pulp superior in quality by pulping waste pressure-sensitive adhesive paper to which no treatment other than discarding has hitherto been applicable comprises such processes that: waste paper is disaggregated; suspension of said disaggregated waste paper is diluted; diluted liquid is roughly filtered with a screen having slits 0.5 mm wide or less; pulp-containing suspension obtained is dehydrated and concentrated so that concentration of solid content is 15 to 40 % by weight; mechanical agitating treatment is applied to said concentrated material while keeping a temperature difference of said material before and after the treatment at 12 °C or lower; a material thus obtained is again diluted; the diluted liquid is finely filtered with a screen having slits 0.2 mm wide or less; surfactant is added to said material for floatation treatment; and cleaning treatment is applied to said material by means of a heavy-foreign-matter cleaner and/or light-foreign-matter cleaner prior to washing.
Inventors:
KITAO OSAMU (JP)
TSUJI MASARU (JP)
OKUDA MASATOSHI (JP)
UCHIMURA SHUNICHI (JP)
TANAKA JUN-ICHIROU (JP)
TSUJI MASARU (JP)
OKUDA MASATOSHI (JP)
UCHIMURA SHUNICHI (JP)
TANAKA JUN-ICHIROU (JP)
Application Number:
PCT/JP1991/001366
Publication Date:
April 30, 1992
Filing Date:
October 07, 1991
Export Citation:
Assignee:
KANZAKI PAPER MFG CO LTD (JP)
International Classes:
D21B1/32; D21C5/02; D21D5/00; (IPC1-7): D21B1/32; D21C5/02; D21D5/00
Foreign References:
| JPH03130484A | 1991-06-04 | |||
| JPS6414388A | 1989-01-18 | |||
| JPS5729691A | 1982-02-17 | |||
| JPS5742991A | 1982-03-10 | |||
| JPS5119803A | 1976-02-17 |
Attorney, Agent or Firm:
Ashida, Naoe (3rd Floor Kozato Kaikan, 18-14,
Nishi-shimbashi 1-chom, Minato-ku Tokyo 105, JP)
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