WO2021227249A1 - 一种低克重书写纸及其制备方法 - Google Patents

一种低克重书写纸及其制备方法 Download PDF

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WO2021227249A1
WO2021227249A1 PCT/CN2020/103226 CN2020103226W WO2021227249A1 WO 2021227249 A1 WO2021227249 A1 WO 2021227249A1 CN 2020103226 W CN2020103226 W CN 2020103226W WO 2021227249 A1 WO2021227249 A1 WO 2021227249A1
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stage
gram
writing paper
flotation
agent
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PCT/CN2020/103226
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English (en)
French (fr)
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占正奉
李聪定
陈学萍
万涛
宋杰
黄尊宏
方江生
江超
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山鹰国际控股股份公司
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Publication of WO2021227249A1 publication Critical patent/WO2021227249A1/zh

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp

Definitions

  • the invention belongs to the technical field of papermaking, and specifically relates to a low-gram-weight writing paper and a preparation method thereof.
  • the future development trends of the newsprint industry mainly include the following points: 1.
  • the advancement of production technology and the rapid development of electronic media will lead to a sharp drop in the demand for newsprint, and this trend will not be reversed.
  • Demand for new marketing dependence, improving product quality and perfecting the service system will become the core competitiveness of the newsprint industry.
  • 3. Although the market will shrink further, it will not disappear in a short period of time. Competition in the industry will become more intense, and the bankruptcy, industrial adjustment, mergers and acquisitions of related industries will accelerate.
  • Chinese Patent Application CN 108221425 A discloses a method for preparing recycled newsprint from old newsprint.
  • the modified filler is prepared with calcium carbonate as raw materials, chitosan, octadecanoic acid, and sodium hydroxide as coating agents, and calcium chloride as cross-linking agent.
  • the cross-linked products of cationic chitosan can be well packaged.
  • Coating on the surface of calcium carbonate makes the surface of calcium carbonate soft and can fully bond with fibers, enhances the binding force between modified calcium carbonate and fibers, thereby increasing the retention rate of filler calcium carbonate, not only can reduce the production cost of newsprint, but also And can reduce the pollution load of the environment.
  • the Chinese patent application CN1958950A discloses an environmentally friendly newsprint transformation technology. Based on the existing wound papermaking process, the dioxyhuatai photocatalyst with a particle size range of 2-500 nanometers is used as an additive material to make newsprint environmentally friendly. Newsprint can prevent insects and mildew, so that newsprint has the function of collection and storage.
  • the newsprint DIP production line can be transformed. Through the transformation, it will have the ability to produce cultural paper pulp, so that the newsprint machine can switch to cultural paper. It can increase the diversity of products in the paper industry and is of great significance to improving the market competitiveness of enterprises.
  • the present invention provides a low-gram-weight writing paper and its preparation technology, which can transform the newsprint DIP line to make it capable of producing cultural paper pulp.
  • a low-gram-weight writing paper which comprises the following components in parts by weight: 50-90 parts of recycled office waste paper, 0-50 parts of recycled book and magazine paper, and 0.6-2.52 parts of bleaching agent.
  • the low-gram-weight writing paper includes the following components in parts by weight: 50-90 parts of recycled office waste paper, 10-50 parts of recycled book and magazine paper, and 0.6-2.52 parts of bleaching agent.
  • the bleaching agent is a mixture of sodium borohydride, sodium bisulfite, and sodium citrate.
  • the mass ratio of the sodium borohydride, sodium bisulfite, and sodium citrate is 1:6-8:1-2.
  • the mass ratio of the sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2.
  • the present invention also relates to a method for preparing low-gram weight writing paper, which includes the following steps:
  • the preparation method of the low-gram-weight writing paper includes the following steps:
  • Coarse pulp goes through in sequence: a stage of pre-flotation, fine sieving to obtain good pulp and residue;
  • the good pulp is passed through in sequence: the first multi-disc, thermal dispersion, two-stage pre-flotation, slag remover, rear multi-disc, bleaching agent reduction bleaching, the required pulp is obtained in the DIP pulp tower, and the pulp is formed by a mesh
  • the paper machine is made of low-gram writing paper;
  • step (1) the fine sieve is divided into three stages, namely, one-stage fine sieve, two-stage fine sieve, and three-stage fine sieve. It is a classification treatment process. Subsequent processing section.
  • the low-gram-weight writing paper described in the present invention is a writing paper with a basis weight range of 55-60 g/m 2 .
  • a two-stage fine screen is arranged in parallel at the two-stage fine screen to obtain a two-stage parallel two-stage fine screen; and a three-stage fine screen is arranged in parallel at the three-stage fine screen to obtain three stages in parallel.
  • Fine sieve After a stage of fine sieve, the pulp is processed by a two-stage parallel two-stage fine sieve and a two-stage parallel three-stage fine sieve, and then enters the front multiple discs.
  • the sieve slits of the one-stage fine sieve, the second-stage fine sieve, and the three-stage fine sieve are 0.17mm-0.12mm;
  • the first-stage pre-flotation and the second-stage pre-flotation are both performed in a flotation jet, and the number of holes in the flotation jet is 16-28;
  • the treatment process of the slag remover is 1 to 6 stages of grading treatment; the slag remover is a Kadeng low-concentration and high-efficiency slag remover.
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1: 6-8: 1-2, preferably 1:8:2.
  • the amount of bleaching agent used in the reduction bleaching is 12-18 kg/ton of raw material.
  • the pulping is carried out in a rotary drum pulper
  • the process of pulping further includes adding a pulping agent in a drum pulper;
  • the pulping agent includes: caustic soda, sodium soap, and deinking agent;
  • the pulping agent includes 6-10 parts of caustic soda, 12-16 parts of sodium soap, and 0.2-0.3 parts of deinking agent;
  • the usage amount of the pulping agent is 18-27kg/ton of raw material
  • the one-stage pre-flotation process further includes adding a deinking agent
  • the amount of the deinking agent is 0.13-0.18kg/ton crude pulp
  • the good slurry before the good slurry enters the slag remover after the second stage of pre-flotation, it also includes a post-flotation process in which a deinking agent is added to the post-flotation process;
  • the amount of the deinking agent is 0.005-0.05kg/ton good pulp
  • the deinking agent described in this application is composed of sodium fatty acid and fatty alcohol, wherein the mass ratio of sodium fatty acid and fatty alcohol is 3-10:1-5, preferably 8:2;
  • a thermal dispersant is added during the thermal dispersion process
  • the composition of the thermal dispersant is: hydrogen peroxide, caustic soda, and chelating agent;
  • the composition of the thermal dispersant is: 10-50 parts of hydrogen peroxide, 6-12 parts of caustic soda, and 0.6-1 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid and its derivatives
  • the amount of the thermal dispersant is 16-64kg/ton good pulp
  • the preparation method of the low-gram-weight writing paper includes the following steps:
  • Raw material pretreatment the raw materials are subjected to pulping, slag removal, one stage of roughing, one stage of heavy slag removal, to prepare coarse pulp;
  • the present invention has not carried out major transformations to the existing newsprint production line. During the transformation, there is no need to stop the normal production of newsprint, and only part of the pipeline meeting work needs to be completed during the daily shutdown and maintenance. The total project investment is significantly lower than similar transformations in the same industry.
  • the present invention increases the whiteness of the paper after reforming the newsprint DIP production line, meets the requirements of cultural paper, and significantly improves the cleanliness.
  • sodium citrate in the present invention can effectively promote the reductive bleaching effect of sodium borohydride and sodium bisulfite, can effectively adsorb impurities and pollutants in the pulp, and increase the cleanliness of the paper.
  • the flotation jet is modified to improve the removal rate of flotation ink.
  • Figure 1 The main flow chart of the present invention.
  • the Kayden low-concentration and high-efficiency slag remover used in the present invention is a NOSS slag remover sold by Kayden (manufacturer), which can be purchased in the market.
  • the recycled office waste paper of the present invention was purchased from China Huanyu Company with a whiteness of 80 ⁇ 5; the recycled book and magazine paper was purchased from China Huanyu Company with a whiteness of 70 ⁇ 5.
  • Fig. 1 The main process of the preparation method for producing low-gram-weight writing paper according to the present invention is shown in Fig. 1, and includes the following steps:
  • Raw material pretreatment the raw materials are subjected to pulping, slag removal, one stage of roughing, one stage of heavy slag removal, to prepare coarse pulp;
  • step (1) the fine sieve is divided into three stages, namely, one-stage fine sieve, two-stage fine sieve, and three-stage fine sieve. It is a classification treatment process. Subsequent processing section;
  • a two-stage fine screen is arranged in parallel at the two-stage fine screen to obtain a two-stage fine screen in parallel with two stages; a three-stage fine screen is arranged in parallel at the three-stage fine screen to obtain a two-stage parallel three-stage fine screen; After passing through one stage of fine screen, the pulp is processed by two stages of parallel two stage fine screens and two stages of parallel three stage fine screens, and then enters the front multiple discs.
  • the pulping in the present invention is carried out in a rotary drum pulper; the first-stage pre-flotation and the second-stage pre-flotation are both carried out in a flotation jet, and the process of the slag remover is 1 to 6 stages of classification Treatment;
  • the slag remover is a Kayden low-concentration and high-efficiency slag remover.
  • Examples 1-3 and Comparative Examples 1-4 of the present invention are all experiments conducted on the basis of the basic examples, and the whiteness of the raw materials in step (1) is 68.
  • the screen slits of the one-stage fine screen, the second-stage fine screen, and the three-stage fine screen are 0.17mm; the number of holes of the flotation jet is 16 holes;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:7:1 ;
  • the amount of reducing bleaching agent is 14kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 18kg/ton of raw material; in parts by weight, the pulping agent includes 6 parts of caustic soda. , Sodium soap (Xuzhou Kuanlide commercial product) 12 parts, deinking agent 0.2 parts;
  • a deinking agent is added; the amount of the deinking agent is 0.13 kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.005kg/ton of good slurry;
  • the deinking agent described above is composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C 17 H 35 COONa, fatty alcohol is a direct-linked alcohol with carbon number of C12), wherein the sodium fatty acid and The mass ratio of fatty alcohol is 3:5;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 16kg/ton of good slurry;
  • the composition of the thermal dispersant is: 10 parts of hydrogen peroxide, 6 parts of caustic soda, and 0.6 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • the sieve slits of the one-stage fine sieve, the second-stage fine sieve, and the three-stage fine sieve are 0.12mm; the number of holes of the flotation jet is 28 holes;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:6:2 ;
  • the dosage of reducing bleaching agent is 12kg/ton raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 27kg/ton of raw materials; in parts by weight, the pulping agent includes 10 parts of caustic soda , 16 parts of sodium soap, 0.3 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.18 kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the two-stage pre-flotation process, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.05 kg/ton of good slurry;
  • the above-mentioned deinking agent is composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C 17 H 35 COONa, fatty alcohol is a direct-linked alcohol with carbon number of C18), wherein the sodium fatty acid and The mass ratio of fatty alcohol is 10:1;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 64kg/ton of good slurry;
  • the composition of the thermal dispersant is: 50 parts of hydrogen peroxide, 12 parts of caustic soda, and 1 part of chelating agent;
  • the chelating agent is disodium edetate.
  • the sieve slit of the one-stage fine sieve is 0.17mm
  • the sieve slit of the second-stage fine sieve is 0.15mm
  • the sieve slit of the three-stage fine sieve is 0.12mm
  • the number of holes of the flotation jet is 20 holes. ;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2 ;
  • the amount of reducing bleaching agent is 18kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the above-mentioned deinking agent is composed of sodium fatty acid and fatty alcohol (sodium fatty acid is C 17 H 35 COONa, fatty alcohol is a direct-linked alcohol with carbon number of C16), wherein the sodium fatty acid and The mass ratio of fatty alcohol is 8:2;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20 kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • a low-gram-weight writing paper which comprises the following components in parts by weight: 90 parts of recycled office waste paper, 50 parts of recycled book and magazine paper, and 2.52 parts of bleaching agent.
  • the bleaching agent is a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2.
  • the preparation process of low-gram-weight writing paper is the same as in Example 3.
  • the recycled office waste paper and the recycled book and magazine paper are the raw materials of step (1), and the whiteness is 68.
  • a low-gram-weight writing paper comprises the following components in parts by weight: 50 parts of recycled office waste paper and 0.6 parts of bleaching agent.
  • the bleaching agent is a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2.
  • the preparation process of low-gram-weight writing paper is the same as in Example 3.
  • the recycled office waste paper is the raw material of step (1), and the whiteness is 75.
  • Example 3 Compared with Example 3, the only difference lies in the slit width of the fine screen.
  • the sieve slit of the one-stage fine sieve is 0.20 mm
  • the sieve slit of the second-stage fine sieve is 0.15 mm
  • the sieve slit of the three-stage fine sieve is 0.12 mm
  • the number of holes of the flotation jet is 20 holes ;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2 ;
  • the amount of reducing bleaching agent is 18kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the deinking agent described above is composed of sodium fatty acid and fatty alcohol (same as Example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8:2;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • Example 3 Compared with Example 3, the only difference lies in the slit width of the fine screen.
  • the sieve slits of the one-stage fine sieve, the second-stage fine sieve, and the three-stage fine sieve are 0.25 mm; the number of holes of the flotation jet is 20 holes;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2 ;
  • the amount of reducing bleaching agent is 18kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the deinking agent described above is composed of sodium fatty acid and fatty alcohol (same as Example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8:2;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20 kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • Example 3 Compared with Example 3, the only difference lies in the type of bleaching agent.
  • the sieve slit of the one-stage fine sieve is 0.17mm
  • the sieve slit of the second-stage fine sieve is 0.15mm
  • the sieve slit of the three-stage fine sieve is 0.12mm
  • the number of holes of the flotation jet is 20 holes. ;
  • the bleaching agent used in the reductive bleaching is: a mixture of sulfur dioxide and sodium bisulfite, wherein the mass ratio of sodium borohydride and sodium bisulfite is 1:8; the dosage of the reductive bleaching agent is 18 kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the deinking agent described above is composed of sodium fatty acid and fatty alcohol (same as Example 3), wherein the mass ratio of sodium fatty acid to fatty alcohol is 8:2;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20 kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • Example 3 Compared with Example 3, the only difference lies in the type of deinking agent.
  • the sieve slit of the one-stage fine sieve is 0.17mm
  • the sieve slit of the second-stage fine sieve is 0.15mm
  • the sieve slit of the three-stage fine sieve is 0.12mm
  • the number of holes of the flotation jet is 20 holes. ;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8:2 ;
  • the amount of reducing bleaching agent is 18kg/ton of raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the above-mentioned deinking agent is ⁇ -alkyl sulfonate
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20 kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • Example 3 Compared with Example 3, the only difference lies in the number of holes of the flotation jet.
  • the sieve slit of the one-stage fine screen is 0.17mm
  • the sieve slit of the second-stage fine sieve is 0.15mm
  • the sieve slit of the three-stage fine sieve is 0.12mm
  • the number of holes of the flotation jet is 10 holes. ;
  • the bleaching agent used in the reduction bleaching is: a mixture of sodium borohydride, sodium bisulfite, and sodium citrate, wherein the mass ratio of sodium borohydride, sodium bisulfite, and sodium citrate is 1:8; reduction The dosage of bleaching agent is 18kg/ton raw material;
  • the pulping process further includes adding a pulping agent to the drum pulper.
  • the use amount of the pulping agent is 20 kg/ton of raw materials; in parts by weight, the pulping agent includes 7 parts of caustic soda. , 10 parts of sodium soap, 0.2 parts of deinking agent;
  • a deinking agent is added; the amount of the deinking agent is 0.15kg/ton coarse pulp;
  • the good slurry undergoes a post-flotation process before entering the slag remover after passing through the second stage of pre-flotation, in which a deinking agent is added to the post-flotation process, and the amount of the deinking agent is 0.01 kg/ton of good slurry;
  • the above-mentioned deinking agent is composed of sodium fatty acid and fatty alcohol, wherein the mass ratio of sodium fatty acid and fatty alcohol is 8:2;
  • a thermal dispersant is added, and the amount of the thermal dispersant is 20 kg/ton of good slurry; the composition of the thermal dispersant is: 20 parts of hydrogen peroxide, 9 parts of caustic soda, and 0.8 parts of chelating agent;
  • the chelating agent is ethylenediaminetetraacetic acid.
  • the bleaching agent used in the reduction bleaching is: a mixture of sulfur dioxide and sodium bisulfite, wherein the mass ratio of the sodium borohydride and sodium bisulfite is 1:8.
  • the other conditions are the same.

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Abstract

一种低克重书写纸及其制备方法，低克重书写纸按照重量份数计包括如下组分：回收办公废纸50-90份、回收书本杂志纸0-50份、漂白剂0.6-2.52份。制备方法是在新闻纸DIP生产线的精筛阶段新增两级并联精筛设备，在二段前浮选和后多盘之间串联除渣器；通过对新闻纸DIP生产线进行改造使其具备生产文化纸浆料的能力；且生产的低克重书写纸具有较好的纸张性能。

Description

一种低克重书写纸及其制备方法 技术领域
本发明属于造纸技术领域，具体涉及一种低克重书写纸及其制备方法。
背景技术
电子媒体迅猛发展、纸质媒体受到巨大冲击的大背景下，新闻纸产品供过于求问题凸显，产能利用不足问题突出。造纸行业在未来几年预计将进入一个低速发展时如何在目前行业发展处于困难时期。纸质印刷的传统新闻媒介已经进人无法逆转的低迷状况，在短时间内，新闻纸仍旧具有不可代替的作用，但其在信息传播中的主要作用将不断弱化。
未来新闻纸产业未来发展的趋势主要包括以下几点：1.生产技术的进步和电子媒介的快速发展，将导致新闻纸需求量大幅下降，并且此趋势将无法逆转。2.需求新的营销依赖，提高产品质量及完善服务体系将成为新闻纸产业的核心竞争力。3.市场虽然会进一步缩小，但短时间内不会消失，行业的竞争将会更加激烈，相关产业的破产、产业调整、并购整合将会加快。
面对新闻纸产业所出现的问题，存在多种现有新闻纸造纸技术的改造，但现有技术中，多是对现有造纸技术进行的优化升级，并没有改变生产造纸的种类。如中国专利申请CN 108221425 A公开了一种利用旧新闻纸制备再生新闻纸的方法。以碳酸钙为原料、以壳聚糖、十八烷酸、氢氧化钠为包裹剂、以氯化钙为交联剂制备改性填料，通过阳离子壳聚糖的交联物能够很好地包覆在碳酸钙的表面，使碳酸钙表面柔软，能与纤维充分结合，增强改性碳酸钙与纤维之间的结合力，从而提高填料碳酸钙的留着率，不仅可以降低新闻纸的生产成本，而且可以降低环境的污染负荷。以解决了目前所有再生新闻纸工艺不但污染环境，且新闻纸质量也不佳的问题。以及中国专利申请CN1958950A公开了一种环保型新闻纸改造技术，其在现有创痛造纸工艺基础上将粒径分布范围为2-500纳米的二氧华泰光触媒剂作为添加材料，使得新闻纸制成环保型新闻纸，能够防止虫蛀和霉变，使新闻纸具有收藏和保管的作用。
无论是旧新闻纸生产制备再生新闻纸还是对其性能进行的提升改进，都改变 不了电子媒体对新闻纸行业的冲击，因此，为了扭转新闻纸市场逐年萎缩，同时伴随着近几年大量进口新闻纸对国内新闻纸市场的冲击，以及目前新闻纸出现了销售困难的这些不利局面，可以对新闻纸DIP生产线进行改造，通过改造，让其具备生产文化纸浆料的能力，使得新闻纸机转产文化纸。可增加造纸行业产品的多样性，对提高企业的市场竞争力有着重要意义。
发明内容
为克服以上技术问题，本发明提供了一种低克重书写纸及其制备技术，该技术可以通过对新闻纸DIP线进行改造使其具备生产文化纸浆料的能力。
为实现以上目的，本发明提供的技术方案如下：
一种低克重书写纸，所述低克重书写纸按照重量份数计包括如下组分：回收办公废纸50-90份、回收书本杂志纸0-50份、漂白剂0.6-2.52份。
优选地，所述低克重书写纸按照重量份数计包括如下组分：回收办公废纸50-90份、回收书本杂志纸10-50份、漂白剂0.6-2.52份。
优选地，所述漂白剂为硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物。
更优选地，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1：6-8：1-2。
更优选地，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8:2。
本发明还涉及一种低克重书写纸制备方法，包括以下步骤：
在新闻纸DIP生产线的精筛阶段新增两级并联精筛设备，在二段前浮选和后多盘之间串联除渣器；
优选地，所述低克重书写纸制备方法，包括以下步骤：
(1)将原料经过碎浆、前处理后制得粗纸浆；
(2)粗纸浆依次经过：一段前浮选、精筛，得到良浆和残渣；
(3)将良浆依次经过：前多盘、热分散、二段前浮选、除渣器、后多盘、漂白剂还原漂白，在DIP浆塔中得到所需纸浆，纸浆通过夹网成型纸机制得低克重书写纸；
其中，步骤(1)中，所述精筛分为三段，分别为一段精筛、二段精筛、三段精筛，为分级处理过程，粗纸浆经过精筛处理后得到的良浆进入后续处理工段。
本发明中所述的低克重书写纸为定量范围为55-60g/m 2的书写纸。
优选地，在所述二段精筛处并列一个二段精筛，得两级并联的二段精筛；在所述三段精筛处并列一个三段精筛，得两级并联的三段精筛；纸浆经过一段精筛后依次经两级并联的二段精筛、两级并联的三段精筛处理后进入前多盘。
优选地，所述一段精筛、二段精筛、三段精筛的筛缝为0.17mm-0.12mm；
优选地，所述一段前浮选和二段前浮选均在浮选射流器中进行，所述浮选射流器的孔数为16-28孔；
优选地，所述除渣器处理过程为1至6段分级处理；所述除渣器为凯登低浓高效除渣器。
优选地，所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1：6-8：1-2，优选为1:8:2。
优选地，所述还原漂白所用的漂白剂的用量为12-18kg/吨原料。
优选地，所述碎浆在转鼓碎浆机中进行；
优选地，所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂；
优选地，所述碎浆剂包括：烧碱、钠皂、脱墨剂；
优选地，按照重量份数计，所述碎浆剂包括烧碱6-10份、钠皂12-16份、脱墨剂0.2-0.3份；
优选地，所述碎浆剂的使用量为18-27kg/吨原料；
优选地，所述一段前浮选过程，还包括加入脱墨剂；
优选地，所述脱墨剂的用量为0.13-0.18kg/吨粗纸浆；
优选地，所述良浆经过二段前浮选后进入除渣器之前，还包括进行了后浮选过程，所述后浮选过程加入脱墨剂；
优选地，所述脱墨剂的用量为0.005-0.05kg/吨良浆；
优选地，本申请中所述的脱墨剂由脂肪酸纳和脂肪醇组成，其中，所述脂肪酸纳和脂肪醇的质量比为3-10:1-5，优选为8:2；
优选地，所述热分散过程中加入热分散剂；
优选地，所述热分散剂的组成为：双氧水、烧碱、螯合剂；
优选地，按照重量份数计，所述热分散剂的组成为：双氧水10-50份、烧碱6-12份、螯合剂0.6-1份；
优选地，所述螯合剂为乙二胺四乙酸及其衍生物；
优选地，所述热分散剂的用量为16-64kg/吨良浆；
优选地，所述低克重书写纸制备方法，包括以下步骤：
(1)原料前处理：将原料经过碎浆、除渣、一段粗选、一段重质除渣，制得粗纸浆；
(2)精选处理过程：将粗纸浆依次经过一段前浮选、精筛，得到良浆和残渣；
(3)精选后处理过程：将良浆依次经过：前多盘、前中浓立管、螺旋压榨、热分散、漂白塔、二段前浮选、除渣器、后多盘、前中浓立管、还原漂白，在DIP浆塔中得到所需纸浆，纸浆通过夹网成型纸机制得低克重书写纸。
与现有技术比，本发明的技术优势在于：
(1)本发明对现有新闻纸生产线并未进行较大的改造，改造期间无需停止新闻纸正常生产，仅需利用日常停机维护期间完成部分管道碰头工作，项目总投资明显低于同行业类似改造。
(2)本发明经过对新闻纸DIP生产线改造之后，增加了纸张的白度，满足文化纸要求，洁净度明显提升。
(3)本发明中使用柠檬酸钠能够有效促进硼氢化钠和亚硫酸氢钠的还原漂白作用，能够有效吸附纸浆中的杂质及污染物，增加纸张的洁净度。
(4)本发明中对筛缝的选择，提高了的洁净度，同时保障了产能不下降。
(5)本发明中对浮选射流器进行改造，提高了浮选油墨去除率。
附图说明
图1：本发明的主流程图。
现结合附图和实施例对本发明作进一步说明：
具体实施方式
下面通过具体实施例对本发明进行说明，以使本发明技术方案更易于理解、掌握，但本发明并不局限于此。下述实施例中所述实验方法，如无特殊说明，均为常规方法；所述试剂和材料，如无特殊说明，均可从商业途径获得。
本发明中使用的凯登低浓高效除渣器为凯登(厂家)出售的NOSS除渣器，市场可以购买。本发明回收办公废纸购自中国环宇公司，白度80±5；回收书本杂志纸购自中国环宇公司，白度70±5。
基础实施例
本发明生产低克重书写纸制备方法，主要流程如图1所示，包括以下步骤：
(1)原料前处理：将原料经过碎浆、除渣、一段粗选、一段重质除渣，制得粗纸浆；
(2)精选处理过程：将粗纸浆依次经过一段前浮选、精筛，得到良浆和残渣；
(3)精选后处理过程：将良浆依次经过：前多盘、前中浓立管、螺旋压榨、热分散、漂白塔、二段前浮选、除渣器、后多盘、前中浓立管、漂白剂还原漂白，在DIP浆塔中得到所需纸浆，纸浆通过夹网成型纸机制得低克重书写纸。
其中，步骤(1)中，所述精筛分为三段，分别为一段精筛、二段精筛、三段精筛，为分级处理过程，粗纸浆经过精筛处理后得到的良浆进入后续处理工段；
在所述二段精筛处并列一个二段精筛，得两级并联的二段精筛；在所述三段精筛处并列一个三段精筛，得两级并联的三段精筛；纸浆经过一段精筛后依次经两级并联的二段精筛、两级并联的三段精筛处理后进入前多盘。
本发明中所述碎浆在转鼓碎浆机中进行；所述一段前浮选和二段前浮选均在浮选射流器中进行，所述除渣器处理过程为1至6段分级处理；所述除渣器为凯登低浓高效除渣器。
本发明实施例1-3及对比例1-4均是在基础实施例基础上进行的试验，步骤(1)中原料白度为68。
实施例1
本例中，所述一段精筛、二段精筛、三段精筛的筛缝为0.17mm；所述浮选射流器的孔数为16孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:7:1；还原漂白剂的用量为14kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为18kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱6份、钠皂(徐州宽利得市售产品)12份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.13kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.005kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇(脂肪酸钠为C 17H 35COONa，脂肪醇为含碳个数为C12的直连醇)组成，其中，所述脂肪酸纳和脂肪醇的质量比为3:5；
所述热分散过程中加入热分散剂，所述热分散剂的用量为16kg/吨良浆；所述热分散剂的组成为：双氧水10份、烧碱6份、螯合剂0.6份；其中，所述螯合剂为乙二胺四乙酸。
实施例2
本例中，所述一段精筛、二段精筛、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为28孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:6：2；还原漂白剂的用量为12kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为27kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱10份、钠皂16份、脱墨剂0.3份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.18kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.05kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇(脂肪酸钠为C 17H 35COONa，脂肪醇为含碳个数为C18的直连醇)组成，其中，所述脂肪酸纳和脂肪醇的质量比为10:1；
所述热分散过程中加入热分散剂，所述热分散剂的用量为64kg/吨良浆；所述热分散剂的组成为：双氧水50份、烧碱12份、螯合剂1份；其中，所述螯合剂为乙二胺四乙酸二钠。
实施例3
本例中，所述一段精筛的筛缝为0.17mm、二段精筛的筛缝为0.15mm、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为20孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8：2；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮 选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇(脂肪酸钠为C 17H 35COONa，脂肪醇为含碳个数为C16的直连醇)组成，其中，所述脂肪酸纳和脂肪醇的质量比为8:2；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
实施例4
一种低克重书写纸，所述低克重书写纸按照重量份数计包括如下组分：回收办公废纸90份、回收书本杂志纸50份、漂白剂2.52份。
漂白剂为硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8:2。
低克重书写纸的制备工艺与实施例3相同，回收办公废纸和回收书本杂志纸即为步骤(1)的原料，白度68。
实施例5
一种低克重书写纸，所述低克重书写纸按照重量份数计包括如下组分：回收办公废纸50份、漂白剂0.6份。
漂白剂为硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8:2。
低克重书写纸的制备工艺与实施例3相同，回收办公废纸即为步骤(1)的原料，白度75。
对比例1
与实施例3相比，区别仅在于精筛缝缝宽不同。
本例中，所述一段精筛的筛缝为0.20mm、二段精筛的筛缝为0.15mm、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为20孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8：2；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇组成(同实施例3)，其中，所述脂肪酸纳和脂肪醇的质量比为8:2；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
对比例2
与实施例3相比，区别仅在于精筛缝缝宽不同。
本例中，所述一段精筛、二段精筛、三段精筛的筛缝为0.25mm；所述浮选射流器的孔数为20孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8：2；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇组成(同实施例3)，其中，所述脂肪酸纳和脂肪醇的质量比为8:2；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
对比例3
与实施例3相比，区别仅在于漂白剂的种类不同。
本例中，所述一段精筛的筛缝为0.17mm、二段精筛的筛缝为0.15mm、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为20孔；
所述还原漂白所用的漂白剂为：二氧化硫和亚硫酸氢钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠的质量比为1:8；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇组成(同实施例3)，其中，所述脂肪酸纳和脂肪醇的质量比为8:2；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
对比例4
与实施例3相比，区别仅在于脱墨剂的种类不同。
本例中，所述一段精筛的筛缝为0.17mm、二段精筛的筛缝为0.15mm、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为20孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8：2；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂为α-烷基磺酸盐；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
对比例5
与实施例3相比，区别仅在于所述浮选射流器的孔数不同。
本例中，所述一段精筛的筛缝为0.17mm、二段精筛的筛缝为0.15mm、三段精筛的筛缝为0.12mm；所述浮选射流器的孔数为10孔；
所述还原漂白所用的漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8；还原漂白剂的用量为18kg/吨原料；
所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂，所述碎浆剂的使用量为20kg/吨原料；按照重量份数计，所述碎浆剂包括烧碱7份、钠皂10份、脱墨剂0.2份；
所述一段前浮选过程，加入脱墨剂；所述脱墨剂的用量为0.15kg/吨粗纸浆；
所述良浆经过二段前浮选后进入除渣器之前，进行了后浮选过程，所述后浮选过程加入脱墨剂，所述脱墨剂的用量为0.01kg/吨良浆；
本实施例中以上所述的脱墨剂由脂肪酸纳和脂肪醇组成，其中，所述脂肪酸纳和脂肪醇的质量比为8:2；
所述热分散过程中加入热分散剂，所述热分散剂的用量为20kg/吨良浆；所述热分散剂的组成为：双氧水20份、烧碱9份、螯合剂0.8份；其中，所述螯合剂为乙二胺四乙酸。
对比例6
与实施例4相比，区别仅在于漂白剂的种类不同。具体如下：所述还原漂白所用的漂白剂为：二氧化硫和亚硫酸氢钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠的质量比为1:8。其余条件均相同。
效果例
采用《GBT 1541-2007纸和纸板尘埃度的测定》中规定的方法，对改造前后及现有技术中书写纸的尘埃度进行测试，采用《GB T 455.1-1989纸撕裂度的测定法》的方法测量纸张撕裂度，并用纸张白度仪(ELREPHO Code 070)测试书写纸的白度，结果见表1。
表1 纸张性能数据
Figure PCTCN2020103226-appb-000001
Figure PCTCN2020103226-appb-000002
上述详细说明是针对本发明其中之一可行实施例的具体说明，该实施例并非用以限制本发明的专利范围，凡未脱离本发明所为的等效实施或变更，均应包含于本发明技术方案的范围内。

Claims (14)

  1. 一种低克重书写纸，其特征在于：所述低克重书写纸按照重量份数计包括如下组分：回收办公废纸50-90份、回收书本杂志纸0-50份、漂白剂0.6-2.52份。
  2. 根据权利要求1所述的低克重书写纸，其特征在于，所述漂白剂为硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物。
  3. 根据权利要求2所述的低克重书写纸，其特征在于，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1：6-8：1-2。
  4. 根据权利要求3所述的低克重书写纸，其特征在于，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1:8:2。
  5. 一种低克重书写纸制备方法，其特征在于，包括以下步骤：
    (1)将原料经过碎浆、前处理后制得粗纸浆；
    (2)粗纸浆依次经过：一段前浮选、精筛，得到良浆和残渣；
    (3)将良浆依次经过：前多盘、热分散、二段前浮选、除渣器、后多盘、漂白剂还原漂白，最后在DIP浆塔中制得低克重书写纸；
    其中，步骤(1)中，所述精筛分为三段，分别为一段精筛、二段精筛、三段精筛，为分级处理过程，粗纸浆经过精筛处理后得到的良浆进入后续处理工段。
  6. 如权利要求5所述的低克重书写纸制备方法，其特征在于，在所述二段精筛处并列一个二段精筛，得两级并联的二段精筛；在所述三段精筛处并列一个三段精筛，得两级并联的三段精筛；纸浆经过一段精筛后依次经两级并联的二段精筛、两级并联的三段精筛处理后进入前多盘。
  7. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述一段精筛、二段精筛、三段精筛的筛缝为0.17mm-0.12mm。
  8. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述一段前浮选和二段前浮选均在浮选射流器中进行，所述浮选射流器的孔数为16-28孔。
  9. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述除渣器 处理过程为1至6段分级处理；所述除渣器为凯登低浓高效除渣器。
  10. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述漂白剂为：硼氢化钠和亚硫酸氢钠、柠檬酸钠的混合物，其中，所述硼氢化钠和亚硫酸氢钠、柠檬酸钠的质量比为1：6-8：1-2，优选为1:8:2。
  11. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述碎浆在转鼓碎浆机中进行；所述碎浆的过程，还包括在转鼓碎浆机中加入碎浆剂；所述碎浆剂包括：烧碱、钠皂、脱墨剂。
  12. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述一段前浮选过程，还包括加入脱墨剂；所述良浆经过二段前浮选后进入除渣器之前，还包括进行了后浮选过程，所述后浮选过程加入脱墨剂。
  13. 如权利要求5所述的低克重书写纸制备方法，其特征在于，所述热分散过程中加入热分散剂；所述热分散剂的组成为：双氧水、烧碱、螯合剂；优选地，所述螯合剂为乙二胺四乙酸及其衍生物。
  14. 如权利要求5-13任一所述的低克重书写纸制备方法，其特征在于，所述低克重书写纸制备方法，包括以下步骤：
    (1)原料前处理：将原料经过碎浆、除渣、一段粗选、一段重质除渣，制得粗纸浆；
    (2)精选处理过程：将粗纸浆依次经过一段前浮选、一段精筛、二段精筛、三段精筛，得到良浆和残渣；
    (3)精选后处理过程：将良浆依次经过：前多盘、前中浓立管、螺旋压榨、热分散、漂白塔、二段前浮选、除渣器、后多盘、前中浓立管、漂白剂还原漂白，最后在DIP浆塔中制得低克重书写纸。
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