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Preparation method of offset paper

A technology of offset paper and sizing agent, which is applied in the direction of paper, water-repellent agent addition, and no pigment coating, etc. It can solve the problems of dirty back of printed matter, large production site, and slow drying speed, so as to shorten the drying time and improve production efficiency. Effects of increased speed and reduced waste

Inactive Publication Date: 2012-08-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the traditional offset paper is printed with ink, the back of the printed matter will be smudged to varying degrees, that is, the ink on the lower printed matter will smudge the back of the upper printed matter because it is not dry. The main reason is that The drying speed of the ink on the paper is slow, and the printing speed of the printing press is fast. Therefore, the ink is not dry on the paper, and the back of the next print is piled on the ink that has not yet dried, resulting in Smearing on the back of printed matter; in order to solve the problem of smearing on the back of printed matter, the general method is: reduce the printing speed and prolong the drying time of printed matter; or sprinkle a layer of powder on the surface of printed matter, and use powder particles to isolate the ink layer from the previous The back side of the layer of paper is contacted, and then the printed matter is put into the warehouse to dry, which is obviously inefficient and takes up a large production space

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Preparation of oxidized starch solution

[0020] The oxidized starch is prepared into an oxidized starch aqueous solution with a mass fraction of 1.0%, and then the oxidized starch aqueous solution is gelatinized in a constant temperature water bath at 88° C. to obtain a transparent oxidized starch solution;

[0021] Step 2: Preparation of sizing agent solution

[0022] Dilute the anion-dispersed rosin gum emulsion with water to a mass fraction of 0.8%, add the diluted anion-dispersed rosin gum emulsion into the oxidized starch solution, and mix uniformly to obtain a sizing agent solution. In the sizing agent solution, the oxidized starch solution and the diluted The anionic dispersed rosin gum emulsion is formulated at a mass ratio of 1:1;

[0023] Step 3: Preparation of ethyl cellulose solution

[0024] Ethyl cellulose (technical grade) is added in the ethanol aqueous solution of 30% by mass fraction, stirs until fully wetting and dissolving to obtain ethyl ...

Embodiment 2

[0030] Step 1: Preparation of oxidized starch solution

[0031] Prepare the oxidized starch into an aqueous oxidized starch solution with a mass fraction of 1.0%, and then gelatinize the aqueous oxidized starch solution in a constant temperature water bath at 92°C to obtain a transparent oxidized starch solution;

[0032] Step 2: Preparation of sizing agent solution

[0033] Dilute the anion-dispersed rosin gum emulsion with water to a mass fraction of 0.8%, add the diluted anion-dispersed rosin gum emulsion into the oxidized starch solution, and mix uniformly to obtain a sizing agent solution. In the sizing agent solution, the oxidized starch solution and the diluted The anionic dispersed rosin gum emulsion is formulated at a mass ratio of 1:1;

[0034] Step 3: Preparation of ethyl cellulose solution

[0035] Ethyl cellulose (technical grade) is added in the ethanol aqueous solution of 30% by mass fraction, stirs until fully wetting and dissolving to obtain ethyl cellulose ...

Embodiment 3

[0041] Step 1: Preparation of oxidized starch solution

[0042] Prepare the oxidized starch into an aqueous oxidized starch solution with a mass fraction of 1.0%, and then gelatinize the aqueous oxidized starch solution in a constant temperature water bath at 89°C to obtain a transparent oxidized starch solution;

[0043] Step 2: Preparation of sizing agent solution

[0044] Dilute the anion-dispersed rosin gum emulsion with water to a mass fraction of 0.8%, add the diluted anion-dispersed rosin gum emulsion into the oxidized starch solution, and mix uniformly to obtain a sizing agent solution. In the sizing agent solution, the oxidized starch solution and the diluted The anionic dispersed rosin gum emulsion is formulated at a mass ratio of 1:1;

[0045] Step 3: Preparation of ethyl cellulose solution

[0046] Ethyl cellulose (technical grade) is added in the ethanol aqueous solution of 30% by mass fraction, stirs until fully wetting and dissolving to obtain ethyl cellulose ...

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PUM

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Abstract

The invention provides a preparation method of offset paper. The method comprises the following steps of: preparing 1.0 mass percent of oxidized starch solution and 0.8 mass percent of anionic dispersed rosin emulsion, evenly mixing the oxidized starch solution and the anionic dispersed rosin emulsion in equal quantity, so as to prepare sizing agent solution; adding ethyl cellulose into the sizing agent solution, stirring and evenly mixing, preparing surface sizing solution of the ethyl cellulose, the oxidized starch and the anionic dispersed rosin emulsion; and performing sizing, drying and press finishing on the raw offset paper on a surface sizing machine by using the surface sizing solution. The ethyl cellulose solution, the oxidized starch solution and the anionic dispersed rosin emulsion are mixedly coated on the surface of the raw offset paper; the composite film formed by ethyl cellulose, oxidized starch and neutral rosin has lipophilicity; the affinity of the paper and ink can be obviously improved; binders of the ink can rapidly permeate into fiber clearances of the paper; the drying speed of the ink on the surface of the paper can be accelerated; and the offset paper is low in cost, and has a good popularization and application value.

Description

technical field [0001] The invention relates to a method for preparing paper, in particular to a method for preparing offset paper. Background technique [0002] After the traditional offset paper is printed with ink, the back of the printed matter will be smudged to varying degrees, that is, the ink on the lower printed matter will smudge the back of the upper printed matter because it is not dry. The main reason is that The drying speed of the ink on the paper is slow, and the printing speed of the printing press is fast. Therefore, the ink is not dry on the paper, and the back of the next print is piled on the ink that has not yet dried, resulting in Smearing on the back of printed matter; in order to solve the problem of smearing on the back of printed matter, the general method is: reduce the printing speed and prolong the drying time of printed matter; or sprinkle a layer of powder on the surface of printed matter, and use powder particles to isolate the ink layer from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/34D21H23/32
Inventor 陈永常刘筱霞
Owner SHAANXI UNIV OF SCI & TECH
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