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CN-121976425-A - Method for manufacturing coarse grain long net double-cylinder hand towel based on wet wrinkling

CN121976425ACN 121976425 ACN121976425 ACN 121976425ACN-121976425-A

Abstract

The invention discloses a wet wrinkling-based coarse grain long-wire double-cylinder hand towel manufacturing method, which comprises the following steps of mixing and processing fiber raw materials with chemical auxiliary agents to obtain pulp with a beating degree of 28-35 DEG SR, long-wire forming, conveying the pulp to a long-wire forming part, dehydrating by a dehydration element with a specific vacuum gradient to form wet paper sheets with fibers in directional arrangement and uniform distribution, double-cylinder drying, namely sequentially carrying out contact drying on the wet paper sheets by a first drying cylinder and a second drying cylinder to obtain a semi-dry paper web with a dryness of 88% -92%, and wet wrinkling, namely carrying out wrinkling operation on the semi-dry paper web by a wrinkling scraper to form three-dimensional grains with a depth of not less than 0.8mm on the surface of the paper web. The invention adopts an integrated process of fourdrinier forming, double-cylinder drying and wet wrinkling, and realizes the effective compromise of the depth of the three-dimensional lines and the high wet tensile strength of the paper by the system cooperation of three links on the material state, energy transmission and physical structure.

Inventors

  • LI ZHI
  • LUO SHIYU
  • LI NA
  • HE SHUILIN
  • JU YANBIN
  • YIN XIAOSONG
  • CAI GUORONG

Assignees

  • 广西太阳纸业有限公司
  • 山东太阳纸业股份有限公司
  • 南宁太阳纸业有限公司

Dates

Publication Date
20260505
Application Date
20260313

Claims (10)

  1. 1. The manufacturing method of the coarse grain long net double-cylinder hand towel based on wet wrinkling is characterized by comprising the following steps: Preparing and treating slurry, namely mixing a fiber raw material with a chemical auxiliary agent to obtain slurry with the beating degree of 28-35 DEG SR; The pulp is conveyed to a fourdrinier forming part, and is dehydrated through a dehydration element with a specific vacuum gradient to form wet paper sheets with fibers arranged in an oriented way and uniformly distributed; drying the wet paper sheet by a first drying cylinder and a second drying cylinder in sequence to obtain a semi-dry paper sheet with the dryness of 88-92%; And wet wrinkling, namely carrying out wrinkling operation on the semi-dry paper web at the outlet of the second drying cylinder by adopting a wrinkling scraper so as to form three-dimensional grains with the depth of not less than 0.8mm on the surface of the paper web.
  2. 2. The method for manufacturing a wet creped coarse grain fourdrinier twin-tub toilet paper according to claim 1, wherein the steps of slurry preparation and treatment comprise: Mixing the raw materials of the fiber in proportion to form mixed fiber slurry, wherein the content of the softwood pulp is 40-60%, the content of the hardwood pulp is 30-50% and the content of the bamboo slurry is 10-20% based on 100% of the absolute dry total weight of the softwood pulp, the hardwood pulp and the bamboo slurry; pulping, namely pulping the mixed fiber slurry, wherein the pulping degree is 28-35 DEG SR; The chemical auxiliary agent is added into the pulped slurry, wherein the chemical auxiliary agent comprises a polyamide epichlorohydrin wet strength agent and an organic silicon softening agent, the addition amount of the polyamide epichlorohydrin wet strength agent is 0.5 to 1.5 percent of the total absolute dry weight of the softwood pulp, the hardwood pulp and the bamboo pulp, and the addition amount of the organic silicon softening agent is 0.1 to 0.5 percent of the total absolute dry weight of the softwood pulp, the hardwood pulp and the bamboo pulp.
  3. 3. The method for manufacturing the coarse grain long wire double-cylinder hand towel based on wet wrinkling according to claim 2, wherein in the pulping treatment step, biological enzyme is added into the mixed fiber slurry, and then pulping treatment is carried out, and the pulping degree is 30-33 DEG SR, wherein the biological enzyme is cellulase and/or hemicellulase, and the addition amount of the biological enzyme is 0.01-0.05% of the absolute dry total weight of the three materials of softwood pulp, hardwood pulp and bamboo pulp.
  4. 4. The method for manufacturing the coarse grain long screen double-cylinder toilet paper based on wet wrinkling according to claim 1, wherein in the long screen forming step, the long screen forming part comprises a forming screen, at least three groups of vacuum water sucking tanks are sequentially arranged below the forming screen of the long screen forming part along the running direction of the forming screen, the vacuum degree set value of each group of vacuum water sucking tanks is sequentially increased along the running direction of the forming screen, wherein the vacuum degree set value of the first vacuum water sucking tank in the running direction of the forming screen is-10 kPa to-15 kPa, and the vacuum degree set value of the last vacuum water sucking tank in the running direction of the forming screen is-40 kPa to-50 kPa.
  5. 5. The method of manufacturing wet creped based coarse long wire twin cylinder paper towel according to claim 4, wherein the fourdrinier wire forming section further comprises a wire table shaking mechanism capable of acting on the forming wire and causing mechanical vibration of the forming wire to regulate the uniformity of the transverse distribution of fibers in the slurry on the forming wire by mechanical vibration.
  6. 6. The wet creping-based coarse long wire twin-tub toilet paper manufacturing method according to claim 5, wherein the frequency of the mechanical vibration is 100 to 300 times/min, the amplitude of the mechanical vibration is 3 to 10mm, and the table shaking mechanism is capable of controlling the vibration component of the mechanical vibration in at least one of the transverse, longitudinal and diagonal directions within the plane of the forming wire.
  7. 7. The wet creping-based coarse long wire twin-tub toilet paper manufacturing method according to claim 1, wherein in the twin-tub drying step, the surface temperature of the first dryer is 95-110 ℃, the surface temperature of the second dryer is 105-120 ℃, and the running tension of the suspended running section of the wet paper sheet formed between the first dryer outlet and the second dryer inlet is 0.8 kN/m to 1.5 kN/m.
  8. 8. The wet creping-based coarse long wire twin-tub toilet paper manufacturing method according to claim 7, wherein in the twin-tub drying step, the surface linear velocity of the second drying cylinder is controlled to be higher than the surface linear velocity of the first drying cylinder, and the surface linear velocity of the second drying cylinder is increased by 1% to 3% relative to the surface linear velocity of the first drying cylinder so that the running tension of the suspended running section of the wet paper sheet formed between the first drying cylinder outlet and the second drying cylinder inlet is 0.8 kN/m to 1.5 kN/m.
  9. 9. The method for manufacturing the coarse grain long net double-cylinder hand towel based on wet wrinkling according to claim 1, wherein in the wet wrinkling step, a plurality of on-line grain depth monitoring sensors distributed and arranged along the transverse direction of the paper web are arranged, and the on-line grain depth monitoring sensors are used for synchronously collecting depth values of three-dimensional grains formed at different transverse positions of the paper web; Calculating an average value of the plurality of depth values and a depth uniformity deviation in the transverse direction of the paper web based on the plurality of collected depth values, comparing the average value of the plurality of calculated depth values with a preset target depth value to obtain a first comparison result, and comparing the calculated depth uniformity deviation with a preset target depth uniformity deviation threshold to obtain a second comparison result; And dynamically adjusting an included angle between the wrinkling scraper and the second drying cylinder surface and/or the line pressure of the wrinkling scraper according to the first comparison result and the second comparison result.
  10. 10. The wet creping-based coarse long wire twin-tub toilet paper manufacturing method according to claim 9, characterized in that the angle between the creping doctor and the cylinder surface of the second drying cylinder is 15 to 30 ° and the line pressure of the creping doctor is 20 to 40N/mm.

Description

Method for manufacturing coarse grain long net double-cylinder hand towel based on wet wrinkling Technical Field The invention relates to the technical field of pulping and papermaking production, in particular to a method for manufacturing coarse grain long net double-cylinder hand towel based on wet wrinkling. Background The hand towel is used as daily consumer goods, the global market scale of the hand towel is continuously increased, and the trend of consumer upgrading is obvious. The market shows layering of high-end and masses, and the high-end market (such as hotels and medical treatment) requires products with high water absorbability (more than or equal to 100 mm/10 min), high strength (wet tensile strength more than or equal to 800N/m) and obvious three-dimensional texture (the compression depth more than or equal to 0.8 mm). However, the prior art paper towel production process has inherent limitations and often fails to meet the high-end market demands. The dry wrinkling process has low cost and high speed, but forms shallow lines (less than or equal to 0.3 mm) with water absorption rate lower than about 40%, the wet pressing process can obtain smooth surface but cannot realize a three-dimensional embossing structure, and the line depth (0.5-0.7 mm) of the conventional wet wrinkling process cannot meet the core requirements of high-end hotels, medical fields on three-dimensional touch feeling and quick water absorption, so that the market definitely requires that the product pressing depth is more than or equal to 0.8mm. Therefore, the core technical bottleneck faced by the current hand towel is that it is difficult to achieve deep three-dimensional textures (more than or equal to 0.8 mm) through a single process or simple improvement, and meanwhile, the wet tensile strength (more than or equal to 1000N/m) of the original paper is kept high enough. The prior art paper towel has the problems of uneven fiber distribution, poor wrinkling stability, high energy consumption and the like, so that the consistency of products is low, the yield is unstable, and the requirements of high strength and high softness are difficult to meet. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a manufacturing method of wet wrinkling-based coarse grain long net double-cylinder hand towel, which can realize deep three-dimensional grains and simultaneously can maintain enough high wet tensile strength. In order to solve the technical problems, the invention adopts the following technical scheme: the manufacturing method of the coarse grain long net double-cylinder hand towel based on wet wrinkling comprises the following steps: Preparing and treating slurry, namely mixing a fiber raw material with a chemical auxiliary agent to obtain slurry with the beating degree of 28-35 DEG SR; The pulp is conveyed to a fourdrinier forming part, and is dehydrated through a dehydration element with a specific vacuum gradient to form wet paper sheets with fibers arranged in an oriented way and uniformly distributed; drying the wet paper sheet by a first drying cylinder and a second drying cylinder in sequence to obtain a semi-dry paper sheet with the dryness of 88-92%; And wet wrinkling, namely carrying out wrinkling operation on the semi-dry paper web at the outlet of the second drying cylinder by adopting a wrinkling scraper so as to form three-dimensional grains with the depth of not less than 0.8mm on the surface of the paper web. Preferably, the slurry preparation and treatment steps include: Mixing the raw materials of the fiber in proportion to form mixed fiber slurry, wherein the content of the softwood pulp is 40-60%, the content of the hardwood pulp is 30-50% and the content of the bamboo slurry is 10-20% based on 100% of the absolute dry total weight of the softwood pulp, the hardwood pulp and the bamboo slurry; pulping, namely pulping the mixed fiber slurry, wherein the pulping degree is 28-35 DEG SR; The chemical auxiliary agent is added into the pulped slurry, wherein the chemical auxiliary agent comprises a polyamide epichlorohydrin wet strength agent and an organic silicon softening agent, the addition amount of the polyamide epichlorohydrin wet strength agent is 0.5 to 1.5 percent of the total absolute dry weight of the softwood pulp, the hardwood pulp and the bamboo pulp, and the addition amount of the organic silicon softening agent is 0.1 to 0.5 percent of the total absolute dry weight of the softwood pulp, the hardwood pulp and the bamboo pulp. Preferably, in the pulping treatment step, biological enzyme is added into the mixed fiber slurry, and then pulping treatment is carried out, wherein the pulping degree is 30-33 DEG SR, the biological enzyme is cellulase and/or hemicellulase, and the addition amount of the biological enzyme is 0.01-0.05% of the absolute dry total weight of the three materials of softwood pulp, hardwood pulp and bamboo pulp. Preferably, in the