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CN-121976411-A - Waste material treatment method for toilet paper production

CN121976411ACN 121976411 ACN121976411 ACN 121976411ACN-121976411-A

Abstract

The invention discloses a waste treatment method for toilet paper production, which relates to the technical field of toilet paper production and comprises the following steps of S1, preprocessing, S2, fluffing, S3, purifying, namely, sequentially carrying out coarse screening, fine screening and sand removal on the fluffed mixed waste, S4, purifying, namely, adding the decontaminated mixed waste into a composite biological enzyme for enzymolysis, S5, bleaching, S6, concentrating, S7, homogenizing, S8, storing and recycling the homogenized mixed waste, preprocessing and mixing the dried waste and the wet waste in different modes, and then reducing damage to fibers in a low-shear hydraulic fluffing mode, and removing impurities and adhesives through impurity removal and purification.

Inventors

  • ZHANG JI
  • ZHANG TAO

Assignees

  • 河北金博士卫生用品有限公司

Dates

Publication Date
20260505
Application Date
20260330

Claims (10)

  1. 1. A method for treating waste materials for toilet paper production, comprising the steps of: S1, preprocessing, namely collecting dry waste and wet waste, crushing the dry waste, dehydrating the wet waste, adding the crushed dry waste, and mixing to form mixed waste; s2, fluffing; s3, removing impurities, namely sequentially carrying out coarse screening, fine screening and sand removal on the fluffed mixed waste; S4, purifying, namely adding the mixed waste subjected to impurity removal into a composite biological enzyme for enzymolysis; s5, bleaching; S6, concentrating; s7, homogenizing; s8, storing, namely storing the homogenized mixed waste for recycling.
  2. 2. The method according to claim 1, wherein in S1, the dry waste comprises one or more of dry broke, rewound offcut, and reject product, and the wet waste comprises one or more of wet broke and machine residual pulp.
  3. 3. The method according to claim 2, wherein in S1, the dry waste is crushed to a particle size of 3-8cm, the wet waste is dehydrated to a water content of 55-65%, and the dry waste is mixed with the wet waste in a mass ratio of =7:3 or 4:1.
  4. 4. The method according to claim 1, wherein in S2, the mixed waste enters a low-consistency hydropulper, the defibering concentration is 3.5-5.0%, the temperature is 45-60 ℃, the defibering time is 8-15min, and the rotation speed of the rotor of the low-consistency hydropulper is 300-450r/min.
  5. 5. The waste treatment method for toilet paper production according to claim 1, wherein in the step S3, a vibrating frame type flat screen is adopted, the power is 2.2-3kW, the aperture is 0.8-1.2mm, a fine screen is adopted, the pressure is 0.15-0.25MPa, the aperture is 0.15-0.25mm, a single-stage low-concentration sand remover is adopted, the inlet pressure is 0.2-0.3MPa, and the cone angle is 60 degrees.
  6. 6. The method for treating waste materials for toilet paper production according to claim 1, wherein in the step S4, the mixed waste materials after impurity removal are sent into an enzymolysis reaction tank to be stirred, and a composite biological enzyme is added, wherein the temperature is 40-55 ℃ and the stirring speed is 80-100r/min, the composite biological enzyme is 0.03-0.08% of the mixed waste materials after impurity removal, and the composite biological enzyme is formed by compounding cellulose and lipase in a mass ratio of 2:1.
  7. 7. The method according to claim 1, wherein in S5, the mixed waste subjected to enzymolysis is diluted to 8% -10%, the bleaching temperature is 45-50 ℃, the pH is 7.0-8.0, the time is 60-90min, and the bleaching agent is sodium hypochlorite available chlorine or chlorine-free bleaching agent hydrogen peroxide.
  8. 8. The method for treating waste for toilet paper production according to claim 1, wherein in the step S6, a multi-disc thickener is used, the number of discs is 12-18, the mesh number of the filter screen is 120-150 mesh, the vacuum degree is 0.04-0.06MPa, the disc rotating speed is 1-3r/min, and the removed white water is collected.
  9. 9. The method for treating waste for toilet paper production according to claim 1, wherein in the step S7, a single screw heat disperser is used, the screw diameter is 200-300mm, the power is 110-160kW, the temperature is 90-110 ℃, the pressure is 0.3-0.6MPa, and the gap between a fixed grinding disc and a movable grinding disc of the single screw heat disperser is 0.1-0.2mm.
  10. 10. The waste treatment method for toilet paper production according to claim 1, wherein in the step S8, the homogenized mixed waste is sent to a pulp storage tower, a stirrer is arranged in the pulp storage tower, the stirring speed is 20-30r/min, the recycled waste is obtained, the recycled waste and the virgin wood pulp are mixed according to the proportion of 10% -35%, the pulp is diluted to 0.8% -1.2%, and the pulp is sequentially sent to a high-concentration slag remover and a pulp flow box, and enters a toilet paper machine for papermaking.

Description

Waste material treatment method for toilet paper production Technical Field The invention relates to the technical field of toilet paper production, in particular to a waste material treatment method for toilet paper production. Background The toilet paper is used as a daily necessity, and a lot of waste materials are generated in the production process, especially in the processes of paper making, embossing, rewinding, slitting, packaging and the like, a large amount of dry waste materials such as dry broke, wet broke, rewinding edge, broken paper fragments, finished products with unqualified appearance and the wet waste materials such as wet broke, machine residual pulp and the like are generated, and the waste material rate generally accounts for 10% -20% of the total yield. In the process of treating waste, high-quality fiber resources are wasted in a large amount due to direct landfill or incineration, solid waste and waste gas pollution are generated, environmental pollution is caused, the treatment cost is high, the waste is directly recycled after simple pulping, impurities, adhesives, printing ink and gravel are not thoroughly removed, holes, dirty points and paper breakage of a final finished product are easily caused, the quality of the finished toilet paper is affected, and the waste is formed, the dry waste and wet waste are mixed for treatment, the treatment process is not matched, the fiber is seriously cut, the strength of regenerated pulp is obviously reduced, the adhesive substance cannot be treated, the regenerated pulp can only be mixed in a low proportion, and the recycling rate is low. Therefore, there is a need for a waste treatment method for toilet paper production, which has low fiber loss, clean impurity removal and high recycling utilization, so as to solve the above technical problems. Disclosure of Invention The invention aims to provide a waste treatment method for toilet paper production, which aims to solve the problems. In order to achieve the above purpose, the present invention adopts the following technical scheme: a waste material treatment method for toilet paper production, comprising the following steps: S1, preprocessing, namely collecting dry waste and wet waste, crushing the dry waste, dehydrating the wet waste, adding the crushed dry waste, and mixing to form mixed waste; s2, fluffing; s3, removing impurities, namely sequentially carrying out coarse screening, fine screening and sand removal on the fluffed mixed waste; S4, purifying, namely adding the mixed waste subjected to impurity removal into a composite biological enzyme for enzymolysis; s5, bleaching; S6, concentrating; s7, homogenizing; s8, storing, namely storing the homogenized mixed waste for recycling. Further, in the step S1, the dry waste material includes one or more of dry broke, rewound rim charge and unqualified finished products, and the wet waste material includes one or more of wet broke and machine residual pulp. Further, in the step S1, the particle size of the crushed dry waste is 3-8cm, the water content of the dehydrated wet waste is 55% -65%, and the mass ratio of the dry waste to the wet waste=7:3 or 4:1 in the mixed waste is the same. According to the invention, the dry waste and the wet waste are separately collected and treated and then mixed for subsequent fluffing, so that the problems of uneven fluffing and excessive cutting of fibers caused by overlarge property differences of the dry waste and the wet waste are avoided. Further, in the step S2, the mixed waste enters a low-concentration hydraulic pulper, the fluffing concentration is 3.5-5.0%, the temperature is 45-60 ℃, the fluffing time is 8-15min, and the rotating speed of a rotor of the low-concentration hydraulic pulper is 300-450r/min. The invention adopts a low-concentration, medium-temperature and low-shear hydraulic fluffing mode to mildly fluffe the mixed waste, can obviously reduce the damage to the fibers and improve the retention rate of the fiber length on the premise of ensuring that the fiber bundles are fully dispersed into single fibers. Further, in the step S3, a vibrating frame type flat screen is adopted, the power is 2.2-3kW, the aperture is 0.8-1.2mm, a fine screen is adopted, the pressure is 0.15-0.25MPa, the aperture is 0.15-0.25mm, a single-section low-concentration sand remover is adopted, the inlet pressure is 0.2-0.3MPa, and the cone angle is 60 degrees. According to the invention, impurities with different types and different particle diameters are removed by a triple impurity removal mode, and the impurity removal rate is high. In the step S4, the mixed waste materials after impurity removal are sent into an enzymolysis reaction tank to be stirred, and composite biological enzyme is added, wherein the temperature is 40-55 ℃, the stirring speed is 80-100r/min, the composite biological enzyme is 0.03-0.08% of the mixed waste materials after impurity removal, and the composite biological enzyme is fo