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Technology for improving strength and performance of regenerated cardboard paper by recycling OCC (Old Corrugated Containers) waste paper in energy-saving way

A technology of cardboard and waste paper, which is applied in the field of waste paper recycling and reuse, can solve the problems of high cost and difficult adoption by paper mills, and achieve the effects of improving production efficiency, increasing added value, and reducing processing costs

Inactive Publication Date: 2011-01-05
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These treatment methods are not only expensive, but also need to change the conventional papermaking process (such as increasing the process of chemical or enzymatic pulp treatment after the waste paper is shredded), making it difficult for paper mills to adopt it in the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Save waste paper shredding time and energy consumption: Tear OCC waste paper imported from South Korea (including carton board surface paper and corrugated medium paper) into pieces with a size of 30mm*30mm, put them in a sealed bag and balance for 24 hours before measuring the moisture content. Weigh a certain amount (generally 50 grams) of dry shredded paper and put it into a beaker, add a certain amount of water and NaOH (0-5% dry pulp) and soak it under 10% pulp concentration and room temperature for pretreatment. Time (0-16 hours).

[0020] The pretreated OCC waste paper is disintegrated in a high-consistency hydraulic pulper for a certain period of time (5-45 minutes). The crushing pulp concentration is 10%, the frequency is 30Hz, the rotor speed is 671rpm, and the temperature is room temperature. The disintegrated regenerated fiber is sieved with a sieve sieve with a sieve gap of 0.25mm, and the coarse residue and good pulp are collected respectively. The coars...

example 2

[0026] The residual coarse slag rate is lower under the same crushing conditions: under the experimental conditions of Example-1, the coarse slag rate after 15 minutes and 20 minutes of crushing of waste paper after being treated for 2 hours under different conditions were respectively measured. As shown in Table-2, after 15 minutes of disintegration, the residual coarse residue rate of the waste paper soaked in 2% lye was 4.90%, the coarse residue rate of the waste paper after filtering the alkali solution and adding water was 7.37%, and the waste paper soaked in clean water The paper coarse slag rate is as high as 11.74%.

[0027] Table-2: Effect of different treatment conditions on crushing efficiency (coarse slag rate)

[0028] Soaking (2 hours) method

example 3

[0030] Improvement of mechanical properties: According to the experimental conditions of Example-1, 50 grams of shredded paper was weighed and soaked for 2 hours, then disintegrated for 20 minutes to prepare recycled pulp. Weigh 30 grams of dry fine pulp after screening, washing, and moisture balance, and disintegrate it at 15,000 revolutions in a standard fiber disintegrator to prepare a fiber suspension with a pulp concentration of 0.3%. Sheets were hand-sheeted on a rapid sheet former, and the weight of the hand-sheets was 100 g / m2. After the handwritten paper pages are balanced in moisture under constant temperature and humidity conditions, various physical properties including fracture length, ring pressure index, and burst index are measured according to national standards. The experimental results are shown in Table-3.

[0031] As shown in Table-3, lye soaking not only improves the tensile strength, breaking length, and burst index of recycled paper, but also greatly i...

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Abstract

The invention discloses a method for improving the strength and performance of regenerated cardboard paper by pretreating and disintegrating OCC (Old Corrugated Containers) waste paper, which is characterized in that an OCC waste and old carton which is pretreated by clear water and alkali liquor or not treated is disintegrated into slurry under the alkaline condition. The novel method improves the papermaking performance of regenerated fibers and has the advantages of low treatment cost, disintegrating energy consumption reduction, production efficiency improvement of a disintegrator, flexible and various treatment ways, easy combination with the traditional papermaking process, and the like. The alkali liquor soaking treatment is also beneficial to removing adhesive in the waste paper by filtering during screening. The invention is suitable for the production line for producing the regenerated paper, such as cardboard paper, box paperboard, corrugated paper, white paperboard, and the like by using the waste and old OCC carton as raw materials and is also suitable for a factory for producing the regenerated fibers by using the OCC as the raw material.

Description

Technical field: [0001] The invention belongs to the field of waste paper recovery and reuse, and relates to energy-saving shredding of OCC waste paper, improving the papermaking performance of regenerated fiber, and being used for producing various regenerated papers such as cardboard paper, corrugated paper and white cardboard. Background technique [0002] With the enhancement of people's awareness of environmental protection, the modern paper industry is gradually transforming from a traditional high-pollution industry to a green industry with typical circular economy characteristics that uses recycled waste paper as the main raw material to make paper. [0003] OCC (Old Corrugated Containers) is an important high-quality regenerated fiber resource that has a large amount of recycling and contains a large amount of kraft softwood pulp (especially OCC from North America). At present, the reuse of OCC is mainly simple reuse, that is, the pulp obtained after the old corruga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21C1/06D21F11/00D21F13/00
CPCY02W30/64
Inventor 臧永华刘洪斌崔举峰许英
Owner TIANJIN UNIV OF SCI & TECH
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