Patent classifications
D
TEXTILES; PAPER
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D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
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D21H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
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23/00
Processes or apparatus for adding material to the pulp or to the paper
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D21H23/02
characterised by the manner in which substances are added
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D21H23/70
Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
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D21H23/72
Plural serial stages only
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D21H23/72

Method for controlling decomposition of corrosion-resistant paper
12546063 · 2026-02-10 · ·

There is provided: a method for controlling corrosion-resistant paper with easy decomposability, whereby the paper has corrosion resistance against decomposition due to microorganisms in soil when raising seedlings, the paper retains satisfactory strength during agricultural planting, and desired decomposability is given to the paper after planting or after harvest of crops; and a method for producing corrosion-resistant paper with controlled decomposability. The controlling method is subjected to corrosion-resistant paper containing paper with cellulose fibers and a carboxylic acid crosslinking agent at least partially bonded to each other, the controlling method including a step for treating the corrosion-resistant paper with alkali; and the producing method comprises a step for applying a processing solution containing a carboxylic acid crosslinking agent to paper containing cellulose fibers, a step for subjecting the paper to a heating treatment, and a step for treating the paper undergone the heating treatment with an alkali.

Method for controlling decomposition of corrosion-resistant paper
12546063 · 2026-02-10 · ·

There is provided: a method for controlling corrosion-resistant paper with easy decomposability, whereby the paper has corrosion resistance against decomposition due to microorganisms in soil when raising seedlings, the paper retains satisfactory strength during agricultural planting, and desired decomposability is given to the paper after planting or after harvest of crops; and a method for producing corrosion-resistant paper with controlled decomposability. The controlling method is subjected to corrosion-resistant paper containing paper with cellulose fibers and a carboxylic acid crosslinking agent at least partially bonded to each other, the controlling method including a step for treating the corrosion-resistant paper with alkali; and the producing method comprises a step for applying a processing solution containing a carboxylic acid crosslinking agent to paper containing cellulose fibers, a step for subjecting the paper to a heating treatment, and a step for treating the paper undergone the heating treatment with an alkali.