Technique for producing medium density fiberboard by using modified bulrush

A process method and fiberboard technology, applied in the field of manufacturing medium density fiberboard, can solve the problems of low surface free energy, low bonding strength, difficult penetration, etc., and achieve the effect of expanding raw material sources and huge economic and environmental benefits

Inactive Publication Date: 2008-03-12
TIANJIN SHENGYUN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ash content of reed fiber is 2.5 times that of bagasse and 4-12 times that of wood, and the main component in ash is silicon dioxide (SiO2). 2 ), and form a hard wax layer with fatty substances. It is a non-polar substance, has poor wettability, low surface free energy,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: (plate thickness 12mm)

[0032] The processing method of the embodiment of the present invention 1 modified reed manufactures medium-density fiberboard is carried out as follows:

[0033] 1) The raw material air-dried reed is cut into 30-40mm stalk segments after rolling and splitting.

[0034] 2) Reed leaves, reed trousers, reed ears, reed flowers and flute membranes are removed by winnowing and separation, and the separated reed stalks are called reed chips, which are the raw materials for medium density fiberboard.

[0035] 3) Modification treatment: Put the reed chips into a sealed cooking tank, feed in saturated steam at 160-180°C and an active agent (1-2% NaOH aqueous solution) for modification treatment, and the cooking time is 7-10 Minutes and increase the moisture content to 30-40%.

[0036] 4) Fiber manufacturing: The modified reed shavings are ground into fibers by a thermal mill, and saturated water vapor at 130-140°C is introduced into the t...

Embodiment 2

[0042] Embodiment 2: (plate thickness 16mm)

[0043] The process step of the embodiment of the present invention 2 modified reeds manufacturing medium density fiberboard is as follows:

[0044] 1-5 are the same as in Example 1.

[0045] 6) Mixing granule glue: After the dried fiber is measured, together with the metered granule glue and moisture-proof agent (paraffin emulsion), it is continuously put into the high-speed ring type glue mixing machine to mix the glue. The amount of granule glue mixed It is 14-15% (grain powder rubber weight / dry fiber weight), and the mixing amount of moisture-proof agent is 0.9-1.0% (paraffin weight / dry fiber weight).

[0046] 7) pavement: the reed fiber after mixing the glue is evenly put into the middle layer of the mechanical paving machine of three heads, and the raw materials used for the upper and lower two surface layers (the wood fiber mixed with 10-11% granule glue = Powder glue weight / wood fiber weight) is put into the two ends of mech...

Embodiment 3

[0049] Embodiment 3: (plate thickness 19mm)

[0050] The process step of the embodiment of the present invention 3 modified reeds manufacturing medium density fiberboard is as follows:

[0051] 1-5 are the same as in Example 1.

[0052] 6) Mixing in granule glue: After the dried fiber is measured, it is continuously put into the high-speed ring type glue mixing machine together with the metered granule glue and moisture-proof agent (paraffin emulsion). The mixing amount of the granule glue is 15-16% (weight of granule glue / weight of dry fiber), and the mixing amount of moisture-proof agent is 1-1.2% (weight of paraffin wax / weight of dry fiber).

[0053] 7) Paving: The reed fiber after mixing the glue is evenly put into the middle layer of the mechanical paving machine with three heads, and the raw materials used for the upper and lower two surface layers (wood mixed with 9--10% powder glue) Fiber=grain powder glue weight / wood fiber weight) is dropped into the two ends of mec...

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PUM

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Abstract

The present invention relates to a process method for manufacturing a medium density fiberboard from modified reeds. A whole reed plant is cracked and cut, reed leaves, reed paintings, reed ears, reed flowers and flute diaphragms are all selected out by winnowing and the rest reed stalk which is called reed chipping serves as a raw material. Dry fibers are produced after the modification, defibration and drying by hot air (smoke) of the reed chipping. The dry fiber is metered and quantitative powder adhesives and assistant agents are added. Then the dry fiber is spread on a spreading machine as a prepressed slab of the medium density fiberboard. A rough medium density fiberboard is produced after the pressing and hot pressing of the slab and becomes a qualified medium density fiberboard after a final treatment processing. The present invention is characterized in that the technique method solves the problem of making medium density fiberboard from reeds and powder adhesives and enlarges the raw material resource of medium density fiberboards.

Description

technical field [0001] The invention relates to a method for manufacturing medium-density fiberboards, in particular to a process for manufacturing medium-density fiberboards from modified reeds. Background technique [0002] Phragmites reed is a perennial herb with salt-alkali tolerance. It mostly grows in low-lying water areas, and the aboveground part is annual. Reed stalks are rich in wood fiber, the content of which is equivalent to that of wood, and are high-quality raw materials for wood-based panels. Our country produces 10 million tons of air-dried reeds annually. At present, 50% of the paper consumption is consumed, and other industrial uses have not been developed. Some of them rot year after year, which not only wastes resources but also pollutes water bodies. [0003] The chemical composition of reed fiber is shown in Table 1 and Table 2. It can be seen from Table 1 and Table 2 that the content of reed fiber is high, and the ash content and solution extract are...

Claims

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Application Information

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IPC IPC(8): B27N1/00D21B1/06D21B1/12B27N1/02B27N3/04B27N3/08B27N3/12B27N3/18
Inventor 韩家荣吕凤毅吕增瑞宋忱礼
Owner TIANJIN SHENGYUN NEW MATERIAL TECH
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