Method for reducing difference of two sides of paper, and prepared paper

A two-sided, paper-based technology, applied in the field of papermaking, can solve problems such as differences in fiber composition, achieve the effects of overcoming fluctuations in coalescence ability, improving distribution uniformity, and reducing the difference between two sides

Active Publication Date: 2014-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjust the upward and downward dehydration of the paper sheet by setting independent top wire suction box and bottom wire suction box, thereby improving the difference in appearance o

Method used

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  • Method for reducing difference of two sides of paper, and prepared paper
  • Method for reducing difference of two sides of paper, and prepared paper
  • Method for reducing difference of two sides of paper, and prepared paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1 A glass fiber paper with low double-sided difference

[0060] A glass fiber paper with low two-sidedness, basis weight 85g / m 2 , consisting of two fiber layers, prepared by the following method:

[0061] 1. Each layer is prepared and flowed separately

[0062] The raw materials are mixed with water according to the formula shown in Table 1, dispersed and diluted to a solid weight percent concentration of 0.8%, to obtain slurry I and slurry II, wherein the content of borate fine glass wool fibers in slurry I is higher than that of slurry 7.5% more II;

[0063] 2. Copy into shape

[0064] Slurry I and II are respectively sent to the multi-channel inclined wire paper machine, wherein the slurry I enters the flow channel close to the forming area, and the two layers are simultaneously sheeted and formed, and after dehydration treatment, sizing, drying, and curling, the target paper is obtained. product. The first layer of the glass fiber paper with low doub...

Embodiment 2

[0065] Example 2 A glass fiber paper with low double-sided difference

[0066] A glass fiber paper with low two-sidedness, basis weight 85g / m 2 , consisting of three fiber layers, prepared by the following method:

[0067] 1. Each layer is prepared and flowed separately

[0068] The raw material is mixed with water according to the formula shown in Table 1, dispersed, diluted to a solid weight percent concentration of 0.67%, to obtain slurry I, slurry II and slurry III, wherein the borate fine glass wool fiber in slurry I Content is 7.5% more than slurry II and slurry III;

[0069] 2. Copy into shape

[0070] Slurries I, II, and III are sent to the multi-channel inclined-wire paper machine respectively, and the slurry I enters the flow channel close to the forming area, and the three layers are simultaneously copied and formed. After dehydration treatment, sizing, drying, and curling, that is get the target product. For the glass fiber paper with low two-sided differenc...

Embodiment 3

[0071] Example 3 A glass fiber paper with low double-sided difference

[0072] A glass fiber paper with low two-sidedness, basis weight 85g / m 2 , consisting of three fiber layers, prepared by the following method:

[0073] 1. Each layer is prepared and flowed separately

[0074] Prepare each raw material according to the formula shown in Table 1, then mix with water, disperse, and dilute to a solid weight percentage concentration of 0.67%, to obtain slurry I, slurry II and slurry III, wherein the alkali-free fine glass wool in slurry I The fiber content is 5% more than pulp II and pulp III;

[0075] 2. Copy into shape

[0076] Slurries I, II, and III are sent to the multi-channel inclined-wire paper machine respectively, and the slurry I enters the flow channel close to the forming area, and the three layers are simultaneously copied and formed. After dehydration treatment, sizing, drying, and curling, that is get the target product. For the glass fiber paper with low t...

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Abstract

The invention provides a method for reducing difference of the two sides of paper. The paper is designed to be of a multilayer fiber layer structure; the pulp preparing and beating of each fiber layer are realized independently; a pulp material enters a paper machine with multiple independent flow channels, and is formed in forming areas through simultaneous stacking and paper manufacturing with pulp, wherein the content of fine fibers of which diameters are smaller than 1 micron in the pulp material I entering a flow channel closely adjacent to a forming net is higher than that of fine fibers of pulp material in other layers, and preferably, the content of the fine fibers in the pulp material I is 5-10% higher than that of the fine fibers of the pulp material in other layers. The invention further provides the paper which has low two-side difference, and is prepared by the method, in particular to a glass fiber paper with low two-side difference as well as a coalescent filter element comprising the glass fiber paper with low two-side difference. According to the glass fiber paper with low two-side difference, provided by the invention, the density of fibers in the paper thickness direction is uniform, so that the efficiency and a separation capability of the coalescent filter element can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a method for reducing double-sidedness of paper and the prepared paper with low double-sidedness. Background technique [0002] During the wet forming process of papermaking, due to the action of vacuum suction, on the side close to the paper forming wire, the fine fibers are easily lost along the water flow through the pores of the forming wire, so that the paper sheet on the side of the forming wire The fine fiber content is lower than the other side, resulting in obvious two-sidedness phenomenon, that is, there is a difference in the degree of fiber uniformity in the thickness direction of the paper sheet. For paper with high fine fiber content, such as high-precision filter paper, battery separator, etc., this two-sided difference is more obvious. This has had an important impact on the application of high-performance paper in the fields of filtration and separation. ...

Claims

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Application Information

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IPC IPC(8): D21H13/40D21H15/10D21H27/08D21H27/30D21F11/14
Inventor 胡健梁云唐敏杨振威
Owner SOUTH CHINA UNIV OF TECH
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