Method of papermaking

A white water and aqueous solution technology, used in papermaking, papermaking, textiles and papermaking, etc., can solve problems such as affecting product paper hue, corroding pipe metal materials, etc., to reduce COD in drainage, high deodorization effect, and simplify the effect of chemical treatment.

Inactive Publication Date: 2008-06-25
イーエステクノロジー
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, since the reducing substances are completely oxidized and decomposed with chlorine-based inorganic antibacterial agents, etc., and then the conventional organic antibacterial agents are used, a large amount of available chlorine with strong oxidizing properties will remain, so it will be oxidized and added to the product. dyes, which affect the hue of the product paper, and also corrode metal materials such as pipes used in the white water circulation system of the papermaking process
Moreover, new organic antibacterial agents that are not easily affected by reducing substances are effective in the actual papermaking process containing 5 to 20 mg / L reducing substances, but when they contain higher concentrations of reducing substances, they need to be added high concentration of antimicrobial

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] FIG. 1 is a schematic diagram of a wet end environment control system of a white water circulation line in a papermaking process using a waste paper raw material. The white water after papermaking in the paper machine 100 is first sent to the white water tank 110 , where slime treatment is performed, a part of it is recycled to the pulp inlet 150 , and the other part is sent to the drainage tank 120 . On the other hand, the pulp raw material is sent from the deinking process tank 160 to the seed box 140 , passes through the screening tank 130 , is sent to the pulp inlet 150 , and finally reaches the paper machine 100 . Here, only one white water tank 110 on one paper machine 100 is shown, but usually four paper machines 100 are connected in series, and each paper machine is provided with each white water tank 110 (a), (b) ), (c), (d) slots.

[0045] From the hypochlorous acid water supply system 200, predetermined hypochlorous acid water is continuously supplied to the...

Embodiment 2

[0051] Type of waste paper used: Office waste paper recovered from the office (premium waste paper and medium waste paper were mixed together) were used, and the following bleaching treatment was performed before papermaking.

[0052] Analysis evaluation / Brightness: JIS-P8123 (Hunter whiteness test method)

[0053] Remaining ink amount: Using a microscope (10 times) and an image analyzer (LA-525 manufactured by Pias), the area of ​​the ink in a certain field of view was expressed as a ratio (%).

[0054] The office waste paper is thrown into the pulper for disintegration. The conditions of the pulper were a pulp concentration of 4.5%, a temperature of 26°C, and a NaOH of 1.0%. Next, the waste paper pulp was dewatered in the screw press until the pulp concentration became 18%, and the waste paper pulp was retained in the aging tower for 12 hours. Next, the pulp was diluted to a concentration of 3.5%, and the pulp was extracted from the maturing tower, dedusted by a Jonson scr...

Embodiment 3

[0063]The absolute dry mass of 80.0 g of kraft pulp after alkali oxygen bleaching (brightness is 47.2%, kappa value is 9.9) is put into a plastic bag, and the pulp concentration is adjusted to 10% with ion-exchanged water, and then pH4. 5. The 10000ppm sodium hypochlorite aqueous solution was soaked for 60 minutes at room temperature for initial bleaching. After diluting the obtained pulp with ion-exchanged water to 3%, dehydration and washing were performed with a Buchner funnel. The pulp was placed in a plastic bag, and the pulp concentration was adjusted to 10% with ion-exchanged water, then an aqueous sodium hypochlorite solution of pH 5 and 3000 ppm was added, and the mixture was treated at room temperature for 90 minutes to perform second-stage bleaching. After diluting the obtained pulp with ion-exchanged water to adjust the pulp concentration to 3%, a pulp mat was formed with a Buchner funnel, and the pulp was dewatered with a pulper to obtain (30.0% concentration) pul...

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Abstract

A method of papermaking in which an optimum wet end environment can be created. A hydrochloric acid acidified aqueous solution of sodium hypochlorite exhibiting a pH value of =4 but <7 and an effective chlorine concentration of 1000 to 10,000 ppm, preferably 3000 to 8000 ppm, is charged in a white water pit and adjusted so that the effective chlorine concentration becomes = 0.5 ppm. Preferably, an aqueous solution of chlorous acid or hypochlorous acid adjusted to a weak acid pH value of =4 but <7 is continuously or intermittently added to papermaking raw water prior to papermaking with the expectation that at bleaching, the residual chlorine concentration is = 500 ppm, thereby carrying out bleaching treatment.

Description

technical field [0001] The present invention relates to a management method capable of simplifying chemical treatment in a papermaking method and optimizing the wet end. Background technique [0002] Under the influence of rising concerns about global environmental issues and neutralization of papermaking conditions, the situation of pulp raw materials has become increasingly severe. Among them, an increase in the mixing amount of DIP or coated broke not only causes a decrease in yield, physical properties of the wet end such as water drainage, or paper quality such as paper strength and sizing, but also It has become an important cause of paper machine failure due to dirt. In order to suppress the above-mentioned decline in productivity and operability, various chemicals are usually added in large amounts, and as a result, a vicious circle in which the paper machine breaks down again due to fouling occurs. [0003] In addition, with the neutralization of papermaking, slim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/04C02F1/50C02F1/76C02F5/08D21F1/66
CPCD21H17/11C02F1/66D21C9/14D21C5/02C02F1/76C02F2209/29D21C9/12D21F1/66C02F2103/28C02F2303/04Y02W30/64
Inventor 立川二男立川浩史立川英夫
Owner イーエステクノロジー
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