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A drying process for coated gray-bottomed white board paper

A white-on-gray, coating technology, applied in the field of papermaking, can solve problems such as partial bulging or warping of paper pages

Active Publication Date: 2022-06-24
湖北长江汇丰纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of producing coated white board paper, the existing drying methods tend to cause partial swelling or edge warping of the paper sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A drying process for coating grey-ground whiteboard paper, comprising the following steps:

[0021] Pre-drying: the base paper is dried in a steam dryer. The steam dryer is divided into three temperature sections. The temperature of the first section is 60 °C, the temperature of the second section is 80 °C, and the temperature of the third section is 80 °C. The dryness of the base paper reaches 85%;

[0022] Coating: epoxy resin, bismaleimide, 4-acetamidophenylphosphonate and modified melamine formaldehyde resin as adhesives, epoxy resin, bismaleimide, 4-acetamidobenzene The mass ratio of phosphonate and modified melamine formaldehyde resin is 5:3:8:1; with bentonite, wollastonite, indigo and kaolin as pigments, the mass ratio of bentonite, wollastonite, indigo and kaolin is 20:10 : 1: 10; mix the adhesive and pigment in a ratio of 6: 1, and apply the curtain coating method to the surface of the previously dried base paper, with a coating weight of 38g / m2 2 ;

[0023...

Embodiment 2

[0025] A drying process for coating grey-ground whiteboard paper, comprising the following steps:

[0026] Pre-drying: the base paper is dried in a steam dryer. The steam dryer is divided into three temperature sections. The temperature of the first section is 80 °C, the temperature of the second section is 110 °C, and the temperature of the third section is 90 °C. The dryness of the base paper reaches 88%;

[0027] Coating: epoxy resin, bismaleimide, 4-acetamidophenylphosphonate and modified melamine formaldehyde resin as adhesives, epoxy resin, bismaleimide, 4-acetamidobenzene The mass ratio of phosphonate and modified melamine formaldehyde resin is 5:3:5:1; with bentonite, wollastonite, indigo and kaolin as pigments, the mass ratio of bentonite, wollastonite, indigo and kaolin is 30:20 : 3:20; mix the adhesive and pigment at a ratio of 6:1, and apply the curtain coating method to the surface of the previously dried base paper, with a coating weight of 42g / m2 2 ;

[0028]...

Embodiment 3

[0030] A drying process for coating grey-ground whiteboard paper, comprising the following steps:

[0031] Pre-drying: the base paper is dried in a steam dryer. The steam dryer is divided into three temperature sections. The temperature of the first section is 70 °C, the temperature of the second section is 90 °C, and the temperature of the third section is 85 °C. The dryness of the base paper reaches 86%;

[0032] Coating: epoxy resin, bismaleimide, 4-acetamidophenylphosphonate and modified melamine formaldehyde resin as adhesives, epoxy resin, bismaleimide, 4-acetamidobenzene The mass ratio of phosphonate and modified melamine formaldehyde resin is 7:4:9:1; with bentonite, wollastonite, indigo and kaolin as pigments, the mass ratio of bentonite, wollastonite, indigo and kaolin is 25:13 : 2: 15; Mix the adhesive and pigment in a ratio of 6: 1, and apply the curtain coating method to the surface of the pre-dried base paper, with a coating weight of 39g / m2 2 ;

[0033] Post-...

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PUM

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Abstract

The invention discloses a drying process for coating gray-bottomed whiteboard paper, which includes pre-drying: drying the base paper with a steam drying cylinder, which is divided into three stages of temperature; coating: using epoxy resin, double Maleimide, 4‑acetamidophenylphosphonate and modified melamine formaldehyde resin are used as adhesives, and bentonite, wollastonite, indigo and kaolin are used as pigments, and the adhesive and pigment are mixed at a ratio of 6:1 , using curtain coating method to coat the base paper surface before drying, the coating quantity is 38 ~ 42g / m 2 ; Post-drying: The coated paper is firstly dried by infrared, the infrared drying temperature is 50-60°C, and then dried by a steam dryer, which is divided into three stages of temperature. The invention has the beneficial effect of reducing or avoiding local swelling or warping of paper sheets.

Description

technical field [0001] The present invention relates to the technical field of papermaking. More specifically, the present invention relates to a drying process of coated gray-bottomed whiteboard paper. Background technique [0002] Coated whiteboard paper has high whiteness on the coated surface, good smoothness, ink absorption and printing gloss, and the cardboard itself has good stiffness and folding endurance, so it can perform high-quality color offset printing and gravure printing. Printing, and can meet the requirements of packaging, it is a high-quality material for making medium and high-end commodity packaging boxes. In the process of producing coated whiteboard paper, the existing drying method tends to cause the phenomenon of partial bulging or edge warping of the paper sheet. SUMMARY OF THE INVENTION [0003] An object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages which will be explained lat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F5/00D21F5/02D21F5/06D21H19/40D21H19/46D21H19/56D21H19/62D21H23/48
CPCD21F5/028D21F5/002D21F5/06D21H19/62D21H19/56D21H19/40D21H19/46D21H23/48
Inventor 魏兵
Owner 湖北长江汇丰纸业有限公司
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