阅读说明：本技术 一种具有防潮效果的办公用纸的制备方法 (Preparation method of office paper with moisture-proof effect ) 是由 韦克 许正茂 雷江波 张朝辉 于 2016-10-11 设计创作，主要内容包括：本发明公开了一种具有防潮效果的办公用纸的制备方法,所述制备方法包括以下步骤：(1)浆料碎解及除渣；(2)打浆；(3)配浆及浆料净化；(4)上网成型；(5)压榨脱水；(6)纸页前干燥；(7)纸页表面处理；(8)纸页后干燥；(9)纸页软压光处理。本发明所述具有防潮效果的办公用纸的制备方法解决了高档办公用纸使用过程中因天气原因导致的纸张返潮问题,提高潮湿天气复印、打印过程中纸张的过机性能,减少翘曲、卡纸等质量问题。(The invention discloses a preparation method of office paper with a moisture-proof effect, which comprises the following steps: (1) crushing and deslagging the slurry; (2) pulping; (3) preparing slurry and purifying the slurry; (4) molding on the net; (5) squeezing and dewatering; (6) drying before paper sheets; (7) treating the surface of the paper sheet; (8) drying the paper sheet; (9) and (5) carrying out soft calendaring treatment on the paper sheet. The preparation method of the office paper with the moisture-proof effect solves the problem of paper moisture regain caused by weather reasons in the use process of high-grade office paper, improves the machine passing performance of the paper in the copying and printing processes in humid weather, and reduces the quality problems of warping, paper jamming and the like.)

1. A preparation method of office paper with a moisture-proof effect is characterized by comprising the following steps:

(1) and (3) crushing and deslagging the slurry: respectively disintegrating long and short fiber sulfate wood pulp and chemical mechanical pulp according to the mass percentage concentration of 5%, and then removing heavy impurities in the pulp, wherein the long fiber sulfate wood pulp is bleached long fiber sulfate softwood pulp, and the short fiber sulfate wood pulp is bleached short fiber sulfate softwood pulp;

(2) pulping: pulping the pulp crushed in the step (1);

(3) slurry preparation and slurry purification: and (3) pulping the long and short fiber sulfate wood pulp and the chemical mechanical pulp according to the mass ratio of the long fiber sulfate wood pulp: short fiber sulfate wood pulp: the weight ratio of the chemi-mechanical pulp is long fiber sulfate wood pulp: short fiber sulfate wood pulp: and (3) chemical mechanical pulp is 10-20: 65-75: 10-15, mixing the slurry, treating the slurry with a slag remover, a degasser and a seam screen to remove impurities, and screening;

(4) and (3) net surfing molding: diluting the pulp treated in the step (3) with water until the mass concentration is 1.0-2.0%, then, passing through a pulp flowing box to net, dehydrating through a forming roller, a loading unit, a low vacuum chamber and a high vacuum chamber, and dehydrating to obtain paper sheets, wherein the dryness of the paper sheets is 23-25%;

(5) squeezing and dewatering: pressing the paper sheet obtained in the step (4) by a second shoe to obtain a paper sheet dryness of 48-52%;

(6) drying before paper sheets: drying the paper sheet obtained in the step (5) by a single-row drying cylinder, wherein the dryness of the paper sheet is 95-97%;

(7) paper sheet surface treatment: carrying out surface sizing treatment and sizing on the paper sheet obtained in the step (6) by adopting surface sizing liquidThe amount of the surfactant is 1.0 to 1.2g/m per side²Wherein the surface sizing solution contains 0.2-0.4 kg of moisture-proof agent per ton of paper;

(8) and (3) drying the paper sheet: removing water in the paper sheet subjected to surface sizing treatment to the water content of 3.5-4.5% through post-drying;

(9) soft calendering treatment of paper sheets: carrying out soft calendering processing on the paper sheet obtained in the step (8) by adopting a controllable medium-high roller, wherein the soft calendering loading pressure is 20-30 KN/m, and obtaining the office paper after the soft calendering processing;

when the pulp is prepared in the step (3), heavy calcium carbonate accounting for 10-14% of the mass of the office paper, light calcium carbonate accounting for 10-14% of the mass of the office paper, cationic starch accounting for 5-7 kg/ton of paper, whitening agent accounting for 2-6 kg/ton of paper, pigment accounting for 0-200 g/ton of paper, alkenyl succinic anhydride accounting for 0.8-1.2 kg/ton of paper, polyacrylamide accounting for 0.2-0.4 kg/ton of paper, bentonite accounting for 2-4 kg/ton of paper, particles accounting for 0.2-0.4 kg/ton of paper, defoaming agent accounting for 0.3-0.5 kg/ton of paper and bactericide accounting for 0.3-0.5 kg/ton of paper are added into the pulp, wherein the alkenyl succinic anhydride is alkenyl succinic anhydride with the content of C18 being 100%.

2. The preparation method of claim 1, wherein the freeness of the long-fiber kraft pulp after beating in the step (2) is controlled to be 300-400 CFS, and the freeness of the short-fiber kraft pulp is controlled to be 280-380 CFS.

3. The preparation method according to claim 1, wherein the surface sizing liquid in the step (7) further comprises the following components in concentration: 30-40 kg of raw starch per ton of paper, 2-4 kg of sizing agent per ton of paper, 4-8 kg of whitening agent per ton of paper and 2-4 kg of salt per ton of paper.

4. The method of claim 1, wherein the microparticle is an anionic polyacrylamide.

5. The method according to claim 1, wherein the moisture-proofing agent in the step (7) is a mixture of modified starch and acrylamide graft copolymer or polyethylene wax emulsion.

Technical Field

The invention belongs to the technical field of papermaking, and particularly relates to a preparation method of office paper with a moisture-proof effect.

Background

The common office paper is sized by using common alkenyl succinic anhydride, the water resistance of the finished paper is common, and moisture absorption is easy in wet weather. The moisture control of the finished paper is high, the paper is not easy to keep dry, and the problems of warping, paper jam and the like are easily caused in the printing and copying processes in wet weather, so that the efficiency is reduced. The common office paper is usually filled with light calcium carbonate or heavy calcium carbonate in the paper making process, certain abrasion is generated to office equipment due to excessively high filling amount, and the finished paper is low in bulk and poor in machine passing performance due to the fact that heavy calcium carbonate pulp is filled. In the existing papermaking production process, the evaluation standard of the warping and printing adaptability of paper is not complete or the pertinence is not strong, and the requirement of higher quality of paper cannot be met.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a preparation method of office paper with a moisture-proof effect, and solves the problem of paper moisture regain caused by weather in the use process of the office paper.

In order to realize the purpose, the technical scheme is as follows: a preparation method of office paper with a moisture-proof effect comprises the following steps:

(1) and (3) crushing and deslagging the slurry: respectively breaking long and short fiber sulfate wood pulp and chemical mechanical pulp according to the mass percentage concentration of 5%, and then removing heavy impurities in the pulp;

(2) pulping: pulping the pulp crushed in the step (1);

(3) slurry preparation and slurry purification: and (3) pulping the long and short fiber sulfate wood pulp and the chemical mechanical pulp according to the mass ratio of the long fiber sulfate wood pulp: short fiber sulfate wood pulp: the weight ratio of the chemi-mechanical pulp is long fiber sulfate wood pulp: short fiber sulfate wood pulp: and (3) chemical mechanical pulp is 10-20: 65-75: 10-15, mixing the slurry, treating the slurry with a slag remover, a degasser and a seam screen to remove impurities, and screening;

(4) and (3) net surfing molding: diluting the pulp treated in the step (3) with water until the mass concentration is 1.0-2.0%, then, passing through a pulp flowing box to net, dehydrating through a forming roller, a loading unit, a low vacuum chamber and a high vacuum chamber, and dehydrating to obtain paper sheets, wherein the dryness of the paper sheets is 23-25%;

(5) squeezing and dewatering: pressing the paper sheet obtained in the step (4) by a second shoe to obtain a paper sheet dryness of 48-52%;

(6) drying before paper sheets: drying the paper sheet obtained in the step (5) by a single-row drying cylinder, wherein the dryness of the paper sheet is 95-97%;

(7) paper sheet surface treatment: carrying out surface sizing treatment on the paper sheet obtained in the step (6) by adopting surface sizing liquid, wherein the sizing amount is 1.0-1.2 g/m per surface²Wherein the surface sizing solution contains 0.2-0.4 kg of moisture-proof agent per ton of paper;

(8) and (3) drying the paper sheet: removing water in the paper sheet subjected to surface sizing treatment to the water content of 3.5-4.5% through post-drying;

(9) soft calendering treatment of paper sheets: and (3) carrying out soft calendering treatment on the paper sheet obtained in the step (8) by adopting a controllable medium-high roller, wherein the soft calendering loading pressure is 20-30 KN/m, and obtaining the office paper after the soft calendering treatment.

The long fiber sulfate wood pulp and the short fiber sulfate wood pulp are high-strength and high-whiteness bleached chemical imported long fiber sulfate wood pulp and short fiber sulfate wood pulp, and the use of the high-quality wood pulp ensures high strength, high stiffness and good mechanical properties of the finished paper. The moisture of the finished paper is strictly controlled, the paper is kept dry, and an industrial moisture-proof agent is added in surface sizing, so that the water resistance of the paper is further improved, and the moisture absorption is reduced.

Preferably, the freeness of the long fiber sulfate wood pulp after pulping in the step (2) is controlled to be 300-400 CFS, and the freeness of the short fiber sulfate wood pulp is controlled to be 280-380 CFS.

Preferably, in the step (3), heavy calcium carbonate accounting for 10-14% of the weight of the office paper, light calcium carbonate accounting for 10-14% of the weight of the office paper, cationic starch accounting for 5-7 kg/ton paper, whitening agent accounting for 2-6 kg/ton paper, pigment accounting for 0-200 g/ton paper, alkenyl succinic anhydride accounting for 0.8-1.2 kg/ton paper, polyacrylamide accounting for 0.2-0.4 kg/ton paper, bentonite accounting for 2-4 kg/ton paper, microparticles accounting for 0.2-0.4 kg/ton paper, defoaming agent accounting for 0.3-0.5 kg/ton paper and bactericide accounting for 0.3-0.5 kg/ton paper are added into the pulp during pulp preparation. The density here is relative to the quality of the office paper.

The internal sizing agent uses novel alkenyl succinic anhydride with 100 percent of C18 content and better sizing effect to replace the common alkenyl succinic anhydride, further improves the water resistance of paper and reduces the moisture absorption. The high-whiteness heavy calcium carbonate and the light calcium carbonate are mixed according to a certain proportion to be used as filling materials, so that the whiteness and smoothness of the paper are guaranteed, meanwhile, the higher bulk of the paper is guaranteed, the machine passing performance of the paper is improved, and the occurrence of paper jam is reduced.

Preferably, the surface sizing liquid in the step (7) further comprises the following components in concentration: 30-40 kg of raw starch per ton of paper, 2-4 kg of sizing agent per ton of paper, 4-8 kg of whitening agent per ton of paper and 2-4 kg of salt per ton of paper. The surface sizing agent with good film forming property can form a complete waterproof film. The density here is relative to the quality of the office paper.

Preferably, the microparticles are anionic polyacrylamide.

Preferably, the moisture-proof agent in the step (7) is a mixture of modified starch and acrylamide graft copolymer or polyethylene wax emulsion.

The invention has the beneficial effects that: the invention provides a preparation method of office paper with a moisture-proof effect. According to the technical scheme, a moisture-proof concept is introduced into the production process of high-grade office paper, and the influence of the humid weather environment on the machine passing performance of the paper in the printing and copying processes is small. In addition, the technical scheme uses high-whiteness wood pulp raw materials, high-whiteness heavy calcium carbonate and light calcium carbonate as fillers, the filling amount is reasonably controlled, the produced high-grade cultural paper is high in smoothness and bulk, the mechanical property is further improved, and the requirements of high-grade office places are met.

Drawings

FIG. 1 is a flow chart of the production of office paper with moisture-proof effect according to the present invention.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the following detailed description and accompanying drawings.