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Method for preparing fiberboard capable of preventing glue spots from being generated on steel belt

A fiberboard and glue spot technology, applied in the field of fiberboard preparation, can solve the problems of steel belt wear, reduced service life of steel belt, damage to steel belt, etc.

Pending Publication Date: 2018-11-06
福建省永安林业(集团)股份有限公司永林蓝豹分公司 +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the release agents of some manufacturers use substances containing CL ions as preservatives. The accumulation of CL ions will damage the steel strip, reduce the service life of the steel strip, and increase the cost
Another solution is to brush the glue spot with copper alloy on the surface of the steel belt, but this method will also cause the wear of the steel belt

Method used

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  • Method for preparing fiberboard capable of preventing glue spots from being generated on steel belt
  • Method for preparing fiberboard capable of preventing glue spots from being generated on steel belt
  • Method for preparing fiberboard capable of preventing glue spots from being generated on steel belt

Examples

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preparation example Construction

[0023] A method for preparing a fiberboard that avoids glue spots on steel belts, including fiber preparation, fiber sizing, fiber laying, pre-pressing, hot pressing, and raw board treatment. The hot pressing adopts a double-steel belt continuous hot press 1 , the pre-pressed fiber slab is sent into the inlet of the hot press machine with an entry angle by the feed conveyor 2. The steel belt is paved with sanding powder, so that the billets enter the hot press at the entrance. The billet structure from top to bottom is: sanding powder layer, dry fiber layer, and sanding powder layer. Such as figure 1 shown.

[0024] The sanding powder is taken from a coarse sand frame of a fiberboard sanding machine. Before the sanding powder is fed, the particle surface is covered with an adhesive, and the moisture content is 15%-25%. The adhesive is the same as that used for dry fibers.

[0025] The thickness of the sanding powder layer is 0.1-1.0mm.

[0026] In order to pave the sanding...

Embodiment 1

[0036] The adhesive is a melamine-modified urea-formaldehyde resin adhesive with a solid content of 48-50% liquid adhesive. The sanding powder: covered urea-formaldehyde adhesive: water weight mixing ratio is: 1000kg: 70kg: 160kg.

[0037] The thickness of each layer of the rough structure is (from top to bottom): sanding powder layer 0.1mm, dry fiber layer 79.2mm, sanding powder layer 0.1mm.

[0038] The process parameters in the hot pressing step are: the hot pressing temperature is 170°C, the closing time of the hot pressing machine is 8 seconds, the hot pressing time is 150 seconds, the hot pressing pressure is 0-3.2MPa, and the hot pressing coefficient is 15 seconds / mm.

[0039] After testing, the density of the 9mm low-density fiberboard prepared in this example is 560 kg / m3, and its performance index can reach the furniture-type medium-density fiberboard used in the dry state in the national standard for medium-density fiberboard (GB / T 11718-2009). The performance re...

Embodiment 2

[0042] The difference from Example 1 is that the weight mixing ratio of sanding powder: covered urea-formaldehyde adhesive: water is: 1000kg: 75kg: 100kg.

[0043] The thickness of each layer of the rough structure is (from top to bottom): sanding powder layer 0.5mm, dry fiber layer 78.2mm, sanding powder layer 0.5mm.

[0044] The process parameters in the hot pressing step are: the hot pressing temperature is 210°C, the closing time of the hot pressing machine is 5.5 seconds, the hot pressing time is 105 seconds, the hot pressing pressure is 0-3.2 MPa, and the hot pressing coefficient is 10.5 seconds / mm.

[0045]After testing, the density of the 9mm low-density fiberboard prepared in this example is 560 kg / m3, and its performance index can reach the furniture-type medium-density fiberboard used in the dry state in the national standard for medium-density fiberboard (GB / T 11718-2009). The performance requirement index of fiberboard, the detection value of its performance ind...

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Abstract

The invention relates to a method for preparing a fiberboard capable of preventing glue spots from being generated on a steel belt. The method for preparing the fiberboard capable of preventing the glue spots from being generated on the steel belt comprises the steps of fiber preparation, fiber sizing, fiber paving, prepressing, hot pressing and rough board treatment, specifically, a double steelbelt continuous hot press is adopted for hot pressing, a prepressed fiberboard blank is sent to an entrance of a hot press by a feeding conveyor, sand powder is paved on the surface of the fiberboardblank during the feeding and conveying process, and the sand powder is paved on a lower steel belt at the entrance of the hot press so as to assemble the blank at the entrance of the hot press and enter the hot press. According to the purpose of the method for preparing the fiberboard capable of preventing the glue spots from being generated on the steel belt, the sanding powder can be effectivelyrecycled by paving the sanding powder on the upper and lower surfaces of the fiberboard blank, and the glue spots are prevented from being generated on the surface of the steel belt without using a release agent. According to the method for preparing the fiberboard capable of preventing the glue spots from being generated on the steel belt, the physical performance requirement of the board can berealized under the same production process condition, and recycled sanding powder is used for replacing pre-cured layer fiber raw materials produced by part of the fiberboard, so that no glue spots is generated on the steel belt of the hot press, and meanwhile, the consumption of raw materials for paving some dry fibers is reduced.

Description

technical field [0001] The invention relates to a method for preparing a fiberboard, more particularly to a method for preparing a fiberboard that avoids glue spots on a steel strip. Background technique [0002] Fiberboard is a kind of man-made board made of wood fiber or other plant fiber as the main raw material, prepared by fiber, applied with adhesive, paved and shaped after the fiber is dried, and then hot-pressed. Classified by bulk density, fiberboard can be divided into high-density fiberboard, medium-density fiberboard, and low-density fiberboard. Due to the uniform material of fiberboard, it is widely used in the processing of furniture, floors, beds, wall panels, packaging boxes, ceilings, etc. The existing fiberboard sanding powder is mainly used as a low value-added product, and is used as the main raw material for boiler fuel and incense core. [0003] In the production process of MDF, the sanding process is an essential process. The main reason is that in ...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N3/12B27N3/18B27N3/24
CPCB27N3/04B27N3/12B27N3/18B27N3/24
Inventor 陈建新叶新强王永闽陈德金郭祥桃伊启中马林吴祖顺管义榕刘翔晖魏叶满
Owner 福建省永安林业(集团)股份有限公司永林蓝豹分公司
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