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Method for producing paper and paper board

A technology for cardboard and paper materials, applied in papermaking, textiles and papermaking, pulp raw material addition process, etc., can solve problems such as the reduction of the effect of anionic groups

Inactive Publication Date: 2005-10-05
KURITA INDUSTRIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to this method, since the pH is lowered in the case of an acidic papermaking system, the effect of anionic groups is significantly reduced

Method used

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Embodiment approach

[0025] Hereinafter, preferred embodiments of the method for producing paper and board of the present invention will be described in detail.

[0026] First, the branched / crosslinked amphoteric polymer, the anionic organic high molecular particle, the water-soluble anionic high molecular polymer and the water-soluble cationic high molecular polymer used in the present invention will be described.

[0027] Although there is no particular limitation on the monomer components of the branched / crosslinked amphoteric polymer used in the present invention, specific examples of preferred branched / crosslinked amphoteric polymers include amphoteric polymers having 0.5-90 mol % of cationic monomer units represented by the following general formula (1), 0.2-90 mole % of anionic monomer units selected from (meth)acrylic acid, itaconic acid, acrylamide-2-methylpropanesulfonate One or more anionic monomer units of acids and salts thereof, and 1-99.3 mol% of acrylamide units, and have the follo...

Embodiment 1-6、 comparative Embodiment 1、2

[0074] [Example 1-6, comparative example 1, 2: the embodiment of acid high-quality paper]

[0075] A pulp sample of 100% LBKP (hardwood bleached kraft pulp) and 450 cc freeness was adjusted such that the consistency of the mixed pulp sample became 0.8% by weight, based on the dry weight of the paper material.

[0076] The paper material (A) thus prepared was put into a yield tester "DFS", and 2.0% by weight (relative to dry pulp) of aluminum sulfate, 1.0% by weight (relative to dry pulp) of cationized starch ( "Cato-3212", available from NSC Corporation), 10% by weight (relative to dry pulp) of talc ("Talc 86-C", available from Nippon Talk Co. Ltd.) and the first yield-enhancing agent, A second yield-enhancing reagent was then added, thereby preparing filtrate "B". As for the setting conditions of DFS, the method recommended by μ-tec Co., Ltd. was used. Each yield enhancing reagent was added at 20 second intervals. Shear is applied by the tester by stirring under standard c...

Embodiment 7-12、 comparative Embodiment 3、4

[0086] Examples 7-12, Comparative Examples 3 and 4: Examples of neutralizing high-quality paper

[0087] A pulp sample of 100% LBKP (hardwood bleached kraft pulp) and 450 cc freeness was adjusted such that the consistency of the mixed pulp sample became 0.8% by weight, based on the dry weight of the paper material.

[0088] The paper material (A) thus prepared was put into a yield tester "DFS", and 2.0% by weight (relative to dry pulp) of aluminum sulfate, 1.0% by weight (relative to dry pulp) of cationized starch ( "Cato-3212", available from NSC Corporation), 10% by weight (relative to dry pulp) of calcium carbonate ("TP-12L", available from Okutama Kogyo Co. Ltd.) and the first yield-enhancing agent, Filtrate "B" was then prepared by adding a second yield enhancing reagent after 20 seconds. As for the setting conditions of DFS, the method recommended by μ-tec Co., Ltd. was used. Shear is applied by the tester by stirring under standard conditions. The evaluation was perf...

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Abstract

This invention provides a method for producing paper and cardboard, corresponding to paper-making facilities in which an acidic paper-making process and a neutral paper-making process are intermingled, without collapsing the formation in both of the acidic paper-making and neutral paper-making and improving water filterability and yield. This method for producing the paper and cardboard is provided by adding a branched or cross-linked amphoteric polymer, water soluble anionic polymer and / or anionic organic polymer fine particles or water soluble cationic polymer to a paper stock, making it a sheet form by dehydration and then drying.

Description

technical field [0001] The present invention relates to a method of producing paper and board. More specifically, the present invention relates to a method for producing paper and board by adding branched or crosslinked water-soluble amphoteric polymers to the paper material, which can be used in both acidic and neutral papermaking systems function and can significantly increase freeness and yield while preventing damage to the composition and still be able to solve minor problems such as poor operability and fouling. Background technique [0002] In recent paper and board production, the papermaking system tends from acidic papermaking system to neutral papermaking system, some of the reasons are: acidic paper has a shorter life, neutralized paper has better printability, such as ink drying Immediately, and as the proportion of coated paper increases, broken pulp containing large amounts of calcium carbonate flows into the paper material, making these materials unsuitable ...

Claims

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Application Information

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IPC IPC(8): D21H17/45D21H21/10D21H21/14D21H23/00
Inventor 骏河圭二
Owner KURITA INDUSTRIAL CO LTD
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