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CN-121992685-A - High-strength cultural paper and preparation method thereof

CN121992685ACN 121992685 ACN121992685 ACN 121992685ACN-121992685-A

Abstract

The invention belongs to the technical field of cultural paper production, and particularly relates to high-strength cultural paper and a preparation method thereof. The preparation method of the high-strength cultural paper comprises the following steps of pulping, namely grinding and crushing NBKP pulp, LBKP pulp and BCTMP pulp, mixing to obtain mixed pulp, adding a chemical agent, namely adding a dry strength agent, a filler, an internal sizing agent and an auxiliary agent into the mixed pulp, uniformly stirring, performing continuous papermaking forming by a paper machine, and performing squeezing, pre-baking, sizing, post-baking, calendaring and reeling to obtain the high-strength cultural paper. The invention provides the high-strength cultural paper, reduces the dosage of chemicals such as a dry strength agent and the like by optimizing the proportion of slurry, reduces the production cost, improves the strength of the cultural paper and greatly improves the consistency of the product quality, and secondly, the invention also provides the preparation method of the cultural paper, which has simple preparation process and smooth production.

Inventors

  • LIU HUIJIA
  • WANG JUNMING
  • WANG ZENGJIAN

Assignees

  • 山东博汇纸业股份有限公司

Dates

Publication Date
20260508
Application Date
20260402

Claims (8)

  1. 1. The preparation method of the high-strength cultural paper is characterized by comprising the following steps of: (1) Pulping, namely respectively crushing an NBKP pulp board and an LBKP pulp board by a hydropulper, respectively carrying out multistage cone grinding and pulping with BCTMP wet pulp, and mixing the three pulps after pulping to obtain mixed pulp; (2) Adding medicine, namely adding a dry strength agent, a filler, an internal sizing agent and an auxiliary agent into the mixed slurry, and uniformly stirring; (3) Forming on the net, namely continuously manufacturing and forming by adopting a paper machine, and squeezing, pre-drying, sizing, post-drying, calendaring and coiling to obtain high-strength cultural paper; The mixed pulp comprises, by mass, 18-23wt.% of NBKP pulp, 49-57wt.% of LBKP pulp and 25-28wt.% of BCTMP pulp, wherein the freeness of each pulp after grinding is controlled to be 290-310mL of NBKP pulp, 330-350mL of LBKP pulp and 230-250mL of BCTMP pulp.
  2. 2. The method for producing high strength cultural paper according to claim 1, wherein the refining concentration of the three pulps is controlled to be 3.9-4.5wt.% NBKP pulp, 4.7-5.3wt.% LBKP pulp and 3.7-4.3wt.% BCTMP pulp.
  3. 3. The method for preparing high-strength cultural paper according to claim 1, wherein the dry strength agent is a cationic dry strength agent, the viscosity is 500-3000 mPa-s, and the addition amount of the dry strength agent is 4-8 kg/ton of paper.
  4. 4. The method for producing high-strength cultural paper according to claim 1, wherein the filler is a mixture of heavy calcium carbonate and light calcium carbonate, and the filler is added in an amount of 250-270 kg/ton of paper.
  5. 5. The method for producing high-strength cultural paper according to claim 1, wherein the internal sizing agent is alkenyl succinic anhydride, and the addition amount is 1.0-1.3 kg/ton paper.
  6. 6. The method for producing high strength cultural paper according to claim 1, wherein the auxiliary agents are a retention auxiliary agent and a toning auxiliary agent.
  7. 7. The method for preparing high-strength cultural paper according to claim 6, wherein the retention aid is silica sol, the addition amount of the silica sol is 4-6 kg/ton of paper, and the color matching aid is fluorescent whitening agent or dye/pigment toner.
  8. 8. A high strength cultural paper prepared by the method of any one of claims 1 to 7.

Description

High-strength cultural paper and preparation method thereof Technical Field The invention belongs to the technical field of cultural paper production, and particularly relates to high-strength cultural paper and a preparation method thereof. Background The cultural paper is used as a core basic material in the fields of printing, office work, writing and the like, the product quality directly determines downstream application experience, and the paper strength, quality consistency, production cost and production stability are key indexes for measuring production. CN116145465A discloses a double-glue paper and its preparation method, the double-glue paper is prepared by pulping by mechanical pulp, needle-leaf wood chemical pulp, broad-leaf wood chemical pulp with a mass ratio of 20-35:10-30:35-70, matched with filler, auxiliary agent and the like, and through pulping, papermaking, surface sizing and calendaring, the high-yield mechanical pulp freeness of 180-300ml is controlled, the ratio of fiber bundle oversize is less than or equal to 0.1%, the surface glue layer adopts a nano cationic styrene acrylic emulsion and starch compound system, while maintaining high bulk, paper smoothness, opacity and writing anti-strike-through property are improved, mechanical pulp and filler ratio are improved, production cost is reduced, but the mechanical pulp and filler addition amount are increased, and further the surface strength is insufficient, paper printing hair and powder dropping phenomenon is extremely easy to occur. In summary, the existing cultural paper preparation technology still has obvious defects in the aspects of considering production cost, mechanical properties of finished paper, surface quality and the like, so that the research and development of the preparation technology capable of reducing the production cost and guaranteeing the mechanical properties, the surface quality and the production stability of the finished paper has important practical significance and industrial value. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides the high-strength cultural paper, the dosage of chemicals such as a dry strength agent is reduced by optimizing the proportion of slurry, the production cost is reduced, the strength of the cultural paper is improved, the consistency of the product quality is greatly improved, and the preparation method is simple in preparation process and smooth in production. A preparation method of high-strength cultural paper comprises the following steps: (1) Pulping, namely respectively crushing an NBKP pulp board and an LBKP pulp board by a hydropulper, respectively carrying out multistage cone grinding and pulping with BCTMP wet pulp, and mixing the three pulps after pulping to obtain mixed pulp; (2) Adding medicine, namely adding a dry strength agent, a filler, an internal sizing agent and an auxiliary agent into the mixed slurry, and uniformly stirring; (3) And (3) forming on a net, namely continuously manufacturing and forming by adopting a paper machine, and squeezing, pre-drying, sizing, post-drying, calendaring and coiling to obtain the high-strength cultural paper. The mixed pulp comprises, by mass, 18-23wt.% of NBKP pulp, 49-57wt.% of LBKP pulp and 25-28wt.% of BCTMP pulp. In the pulping process, the pulping concentration of the three pulps is controlled to be 3.9-4.5wt.% of NBKP pulp, 4.7-5.3wt.% of LBKP pulp and 3.7-4.3wt.% of BCTMP pulp. The freeness of each pulp after pulping is controlled to be 290-310mL of NBKP pulp, 330-350mL of LBKP pulp and 230-250mL of BCTMP pulp. The dry strength agent is cationic dry strength agent with viscosity of 500-3000 mPa.s, preferably one or more of POLYSTRONCH-1600, POLYSTRONCH-1700, POLYSTRONCH-3100, POLYSTRONCH-3200 of Nantong Sichuan chemical industry Co., ltd, and further preferably POLYSTRONCH-1700, and solid content of 20wt.%. The dry strength agent is added in an amount of 4-8 kg/ton of paper, preferably 10-15 times diluted with water when in use, based on the total mass of all components. The filler is a mixture of heavy calcium carbonate and light calcium carbonate, the addition amount of the filler is 250-270 kg/ton paper, and the mass ratio of the heavy calcium carbonate to the light calcium carbonate is 7:3. The internal sizing agent is alkenyl succinic anhydride, and the addition amount is 1.0-1.3 kg/ton paper, preferably 1.0 kg/ton paper. The auxiliary agents are retention auxiliary agents and color matching auxiliary agents. The retention aid is silica sol, the color matching aid is fluorescent brightening agent and dye/pigment toner, wherein the addition amount of the silica sol is 4-6 kg/ton paper, preferably 4 kg/ton paper, further the fluorescent brightening agent is divided into disulfonic acid fluorescent brightening agent added in the slurry in the step (2) and hexasulfonic acid fluorescent brightening agent added in the surface sizing section in the step (3), the tw