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Medium density board produced with paper-making sludge and producing method thereof

A technology of papermaking sludge and medium density, applied in papermaking, textiles, papermaking, fiberboard, etc., can solve the problems of secondary pollution, high treatment costs, waste of land resources, etc., to save heat energy, low production costs, and save land resources Effect

Inactive Publication Date: 2008-02-13
李道路
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method of papermaking sludge is to use a sludge dehydrator to dry it and then bury it. The treatment cost is high, land resources are wasted and secondary pollution is easy to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In the present invention, papermaking sludge is used as raw material, which is mechanically dehydrated, formed and compounded into a wet medium density board with a moisture content of 70%, and then the wet medium density board is put into a press dryer and passed through Further dehydration, high-pressure setting under the pressure of 0.4MPa, and high-temperature drying at 170°C for 30 minutes to make finished MDF products. According to needs, the thickness of the finished MDF can be made into 1.2mm~3mm.

Embodiment 2

[0015] In the present invention, papermaking sludge is used as raw material, and plant fibers accounting for 2% of the dry weight of papermaking sludge are added to the raw material of papermaking sludge for conditioning to enhance the mechanical properties of medium density boards, and then undergo mechanical dehydration, molding and Composite into wet medium density board with a moisture content of 70%, then put the wet medium density board into the press dryer, further dehydration in the press dryer, high pressure setting under the pressure of 0.4MPa, at 170 ℃ Dry at a high temperature for 30 minutes at a certain temperature to make a finished MDF product.

Embodiment 3

[0017] The present invention takes papermaking sludge as raw material, and firstly adds plant fibers accounting for 2% of the absolute dry weight of the papermaking sludge to the raw material of the papermaking sludge for conditioning to enhance the mechanical properties of the medium density board. Starch with a dry weight of 1‰ and aluminum sulfate accounting for 3‰ of the absolute dry weight of the paper sludge to enhance the dehydration performance of the paper sludge. The purpose of adding aluminum sulfate is to adjust the pH value and dehydration performance of the sludge. The pH value is adjusted to 6-9, which is beneficial to environmental protection. Then, it is mechanically dehydrated, shaped and composited into a wet medium density board with a moisture content of 70%, and then the wet medium density board is put into a squeeze dryer, which is further dehydrated in the squeeze dryer, and is heated at 0.4MPa High-pressure shaping under pressure, high-temperature dryi...

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PUM

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Abstract

The present invention relates to a medium density board produced by utilizing sludge of paper mill and its production method. Said invention uses the sludge of paper mill as raw material, and adopts the following steps: mechanical dewatering, forming to obtain wet medium density board whose water content is 60%-80%, pressing, drying, further dewatering, high-pressure forming and high-temperature drying so as to obtain the invented medium density board.

Description

technical field [0001] The invention relates to a medium density board produced by using papermaking sludge and a production method. Background technique [0002] Due to its durable performance and aesthetics, MDF has become the darling of decorative materials, and its output is increasing. The medium density board currently used is generally produced with wood fiber, which is restricted by the lack of forests in our country; on the other hand, the reasonable treatment of papermaking sludge is an important part of the comprehensive treatment of papermaking wastewater, usually 20% to 30% of papermaking raw materials 90% to 98% of the suspended solids in the wastewater are separated from the wastewater and become papermaking sludge. The main components are fine fibers, talcum powder, papermaking additives and biological colloids for sewage treatment. At present, the treatment method of papermaking sludge is to use a sludge dehydrator to dry it and then bury it. The treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21J1/16D21H17/64
Inventor 李道路
Owner 李道路