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Method for preparing glue-free lightweight high-strength fiber board

A technology of high-strength fiber and manufacturing method, which is applied in fiberboard, fiber raw material processing, papermaking and other directions, can solve the problems of polluting the indoor environment, endangering the human health and life safety of consumers, etc., and achieves low production cost, easy implementation, and convenient operation. Effect

Inactive Publication Date: 2008-08-06
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the fiberboard produced with urea-formaldehyde resin adhesive releases formaldehyde during use to pollute the indoor environment and endanger the health and life safety of consumers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1), raw material preparation: according to the mass ratio of waste paper and wood fiber is 3: 7 to take waste paper, wood fiber, mix then, obtain mixed material;

[0019] (2) Raw material dissociation: hydrolyze the mixed material at 80°C for 10 hours to obtain a coarse slurry;

[0020] (3), slurry mixing: use a dissociator (rotating speed greater than 500 rpm) to make it mix evenly to obtain slurry;

[0021] (4) The product can be obtained by subsequent processing according to the wet fiberboard process, and its product density is 0.40-0.60g / cm 3 , other physical and mechanical properties have reached or exceeded the relevant national standards.

[0022] Waste paper in the above step (1) refers to waste newspapers, waste books, production waste paper, waste pulp, waste poster paper or chemical pulp; wood fiber refers to fibers used in fiberboard production.

[0023] In the above step (2), the hydrolysis is assisted by temperature, ultrasonic wave, microwave, high fr...

Embodiment 2

[0025] (1), raw material preparation: according to the mass ratio of waste paper and wood fiber is 4: 6 to take waste paper, wood fiber, mix then, obtain mixed material;

[0026] (2) Raw material dissociation: hydrolysis at 100°C for 8 hours under ultrasonic conditions to obtain coarse pulp;

[0027] (3), slurry mixing: use a high-speed pulverizer (rotating speed greater than 500 revolutions / min) to make it mix evenly to obtain slurry;

[0028] (4) The product can be obtained by subsequent processing according to the wet fiberboard process, and its product density is 0.40-0.60g / cm 3 , other physical and mechanical properties have reached or exceeded the relevant national standards.

[0029] In the above step (2), the hydrolysis is assisted by temperature, ultrasonic wave, microwave, high frequency or combined means to achieve accelerated hydrolysis.

Embodiment 3

[0031] (1), raw material preparation: be 4.5: 5.5 to take waste paper, wood fiber according to the mass ratio of waste paper and wood fiber, mix then, obtain mixed material;

[0032] (2), raw material dissociation: hydrolyze the mixed material in cold water for 48 hours to obtain a coarse slurry;

[0033] (3), slurry mixing: adopt high-speed mixer (rotating speed is greater than 500 revs / min) to make it mix evenly, obtain slurry;

[0034] (4) The product can be obtained by subsequent processing according to the wet fiberboard process, and its product density is 0.40-0.60g / cm 3 , other physical and mechanical properties have reached or exceeded the relevant national standards.

[0035] In the above step (2), the hydrolysis is assisted by temperature, ultrasonic wave, microwave, high frequency or combined means to achieve accelerated hydrolysis.

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Abstract

The invention discloses a method for manufacturing non-gel lightweight high strength fiberboards, which comprises following steps: firstly, preparing raw materials, secondly, disassociating the raw materials, thirdly, mixing serous fluid, and fourthly subsequently manufacturing according to wet method fiberboard procedures. The concentration of the non-gel lightweight high strength fiberboards which are produced by the invention is only 0.40-0.60g / cm3, not only the maximum ecological benefits and economic benefits for reclaiming and utilizing waste paper are realized, but also the product can be recycled and utilized since the lightweight high strength fiberboards do not add cementing compound, and secondary pollution is not produced to environment. The method of the invention has the advantages that the method is easily realized, the operation is convenient, the manufacturing cost is only 70-90% of the fiberboards on market, the strength also reaches to or exceeds national standards, more importantly, waste water is not produced through using the technique, and employment opportunities are created, which is beneficial for promoting harmonious development of resources, ecology and society.

Description

technical field [0001] The invention relates to a method for manufacturing a non-adhesive lightweight high-strength fiberboard, in particular to a method for producing a non-glue lightweight high-strength fiberboard by using waste paper and wood fibers. Background technique [0002] Waste paper is an important renewable resource, and the recycling of waste paper is an effective way to solve the three major problems faced by the paper industry, such as shortage of raw materials, energy shortage and pollution. Over the past ten years, countries around the world have attached great importance to the utilization of waste paper resources, and the recycling rate and utilization rate of waste paper have increased year by year. According to the statistics of the United Nations and the World Food and Agriculture Organization, the world's waste paper pulp production reached 9.89 million tons in 1995, accounting for 9.89 million tons of pulp. One-third of the total output, only Guangdo...

Claims

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Application Information

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IPC IPC(8): D21J1/00D21C5/02D21D5/00
CPCY02W30/64
Inventor 张仲凤马清芝彭万喜
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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