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High-efficient sticking and purifying method and apparatus for papermaking white water microstickies

A paper-making white water and sticky technology, which is applied in papermaking, paper machine, textile and paper making, etc., can solve the problem of large accumulation of stickies, and achieve the effect of mitigating harm and negative impact, smooth flow, and promoting contact

Active Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither the dispersion means nor the fixation means can fundamentally effectively solve the problems caused by the fine stickies, which not only makes the accumulation of stickies in the white water more and more, but also increases with the increase of waste paper recycling and the shortening of the cycle period. , the fine stickies fixed in the fibers will return to the pulp system with the recycling of waste paper, forming secondary stickies, which will continue to worsen the problem
[0006] Therefore, the existing fine sticky matter control technology can no longer meet the needs of the current sticky matter problem. To solve the sticky matter problem in waste paper pulping, especially the sticky matter problem in the papermaking stage, the key lies in the fine sticky matter in white water. The removal and purification of stickies, removing stickies from the papermaking stage and cleaning them out of the system, completely cutting off the flow of stickies in the waste paper recycling system is the fundamental solution to the problem of stickies in waste paper pulp where the

Method used

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  • High-efficient sticking and purifying method and apparatus for papermaking white water microstickies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare the slurry with label paper and copy paper with pressure-sensitive adhesive, then sieve, and filter and recover the fibers, fillers and other components contained in it with a dynamic water filter with a mesh number of 200 mesh, and obtain the fine The papermaking white water (white water of office waste paper mixed with pressure-sensitive adhesive) with a solid content of 0.1% of the fiber, fine sticky matter, filler and other components is taken. Part of the white water is selected from a laser particle size analyzer. Detected at room temperature, and compared with the standard curve established by standard particles, the content of fine stickies was 2.66×10 -3 mm 3 / mL, its surface energy is 46.3mJ / m 2 , and then use a rotor covered with a hydrophobic polyethylene film, with an opening ratio of 50% and a hole diameter of 15mm. Stir in the container at room temperature and 800rpm at a constant speed for 60min to adhere to the fine stickies. The surface energy...

Embodiment 2

[0039] With the same slurry in Example 1, the fiber and part of the filler in the recycled slurry are reused with the dynamic water filter of the same 200 mesh filter screen to obtain the papermaking white water (mixed with pressure-sensitive The white water of the office waste paper of glue) filter and recover the components such as fibers and some fillers contained therein, take part of the treated white water, and use the same fine sticky matter measuring instrument and method in Example 1 to measure the content of fine sticky matter therein is 3.28×10 -3 mm 3 / mL, its surface energy is 46.3mJ / m 2 , and then a rotor of the same size, but with a surface porosity of 30%, a pore diameter of φ10mm, and a rotor covered with a hydrophobic polytetrafluoroethylene film, stirred at a constant speed of 800 rpm in the container for 80 minutes at room temperature to adhere to the fine stickies, The surface energy of the film is 48.2mJ / m 2 , and then take the same method to detect th...

Embodiment 3

[0043] Retrieve the white water from the old newsprint machine from the newsprint factory, and use the same 200-mesh filter to reuse the fibers and some fillers in the slurry to obtain papermaking white water with a solids concentration of 0.1%. , take part of the white water, and use the same micro-sticky analysis instrument and method in Example 1 to measure the micro-sticky content in it to be 12.26×10 - 3 mm 3 / mL, its surface energy is 50.7mJ / m 2 , and then use the rotor covered with film on the surface to stir the fine stickies in the container at room temperature and 900rpm at a constant speed for 90min. The surface energy of the film is 68.7mJ / m 2 , and then adopt the same method to check that the content of fine stickies in white water after adhesion is 11.45×10 -3 mm 3 / mL, the calculated adhesion removal efficiency of fine stickies was 6.61%.

[0044] In addition, take the same recycled white water, put it in the same container, and replace the surface of the r...

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Abstract

The invention discloses a high-efficient sticking and purifying method and apparatus for papermaking white water microstickies. The method comprises the following steps: recovering fibers and partial packing in papermaking white water by adopting a filtering or sieving way to obtain white water suspension; stirring the white water suspension at a constant speed under conditions that the temperature is 40 to 90 DEG C and the rotating speed is 200 to 1000 rpm, and enabling the microstickies in the white water suspension to be heated and be glutinous; and performing a white water microstickies sticking and purifying treatment process in a container with a rotor, and enabling the rotator to rotate at a constant speed, wherein the rotor is in a rectangular shape, a plurality of holes are uniformly formed in the surface of the rotor, an aperture ratio is 30 to 60 percent, a diameter of the small hole is phi 10 to 200 mm, and a macromolecular hydrophobic material or film with the surface higher than the microstickies covers the surface of the rotor. By adopting the method and the apparatus, microsticke particles in the white water can be effectively removed, the content of the microstickies can be significantly reduced, and no chemical reagent is introduced.

Description

technical field [0001] The invention relates to the purification of fine stickies in papermaking white water, in particular to a device and method for purifying fine stickies in papermaking white water that negatively affects paper machine, operation and paper product quality in the pulping and papermaking process of waste paper; The technical field of secondary fiber recycling. Background technique [0002] With the development of the modern paper industry, waste paper, as a recyclable fiber resource, has become one of the papermaking raw materials widely used in the world. However, with the continuous growth of waste paper utilization and the increasing types of impurities in waste paper, the problems in the process of waste paper recycling are becoming more and more serious, the most prominent of which is the problem of stickies. Stickies in waste paper have a wide range of sources and complex components, mainly including adhesives, tapes, labels, waxes, ink adhesives, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F1/66
CPCD21F1/66
Inventor 李擘唐亚男耿胜芳武书彬陈策刘道恒
Owner SOUTH CHINA UNIV OF TECH
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