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Tower pressure type wood fiber plywood process

A wood fiber and plywood technology, which is applied in wood processing appliances, wood treatment, manufacturing tools, etc., can solve the problems of easy fiber shedding, poor nail holding force, low internal bonding strength, etc. Improve and improve the effect of internal cohesion

Inactive Publication Date: 2020-03-10
ZHEJIANG LIXIANG WOOD IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, due to the nature of fiberboard rebonding, when the fiberboard with low internal bonding strength is punched, the fibers around the hole wall are easy to fall off, resulting in poor nail holding power

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: a kind of tower pressure type wood fiber plywood process comprises the following steps:

[0020] a. Pulverize the wood to obtain wood chips A;

[0021] b. Precooking wood chips A to obtain wood chips B;

[0022] c. Wood chip B is pressure-cooked, and the cooking pressure is 9.0 MPa to obtain wood chip C;

[0023] d. Thermally grind the wood chip C, and the pressure in the grinding chamber is 9.0 MPa. , get wet wood fiber;

[0024] e, wet wood fiber is dried to obtain dry wood fiber, the moisture content of dry wood fiber is 7-9%, preferably 7%;

[0025] f. Mix dry wood fiber with adhesive to obtain soft intermediate material. Adhesives include urea-formaldehyde resin, paraffin and curing agent, the amount of urea-formaldehyde resin is 200kg / m 3 , the amount of paraffin wax is 2.5kg / m 3 , the amount of curing agent is 3.5kg / m 3 ;

[0026] g. Pre-press and trim the soft intermediate material. The pre-pressing process is that the soft intermediate ...

Embodiment 2

[0029] Embodiment two: a kind of tower pressure type wood fiber plywood process comprises the following steps:

[0030] a. Pulverize the wood to obtain wood chips A;

[0031] b. Precooking wood chips A to obtain wood chips B;

[0032] c. Wood chip B is pressure-cooked, and the pressure of cooking is 9.7MPa to obtain wood chip C;

[0033] d. Thermally grind the wood chip C, and the pressure in the grinding chamber is 9.6MPa. , get wet wood fiber;

[0034] e, wet wood fiber is dried to obtain dry wood fiber, the moisture content of dry wood fiber is 7-9%, preferably 7%;

[0035] f. Mix dry wood fiber with adhesive to obtain soft intermediate material. Adhesives include urea-formaldehyde resin, paraffin and curing agent, the amount of urea-formaldehyde resin is 260kg / m 3 , the amount of paraffin wax is 7.0kg / m 3 , the amount of curing agent is 7.0kg / m 3 ;

[0036] g. Pre-press and trim the soft intermediate material. The pre-pressing process is that the soft intermediate...

Embodiment 3

[0039] Embodiment three: a kind of tower pressure type wood fiber plywood process comprises the following steps:

[0040] a. Pulverize the wood to obtain wood chips A;

[0041] b. Precooking wood chips A to obtain wood chips B;

[0042] c. Wood chip B is pressure-cooked, and the pressure of cooking is 9.5MPa to obtain wood chip C;

[0043] d. Thermally grind the wood chip C, and the pressure in the grinding chamber is 9.4MPa. , get wet wood fiber;

[0044] e, wet wood fiber is dried to obtain dry wood fiber, the moisture content of dry wood fiber is 7-9%, preferably 7%;

[0045] f. Mix dry wood fiber with adhesive to obtain soft intermediate material. Adhesives include urea-formaldehyde resin, paraffin and curing agent, the amount of urea-formaldehyde resin is 230kg / m 3 , the amount of paraffin wax is 5kg / m 3 , the amount of curing agent is 5kg / m 3 ;

[0046] g. Pre-press and trim the soft intermediate material. The pre-pressing process is that the soft intermediate m...

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Abstract

The invention discloses a tower pressure type wood fiber plywood process which comprises the following steps: a, crushing wood to obtain a wood chip A; b, pre-cooking the wood chip A to obtain a woodchip B; c, pressurizing and cooking the wood chip B to obtain a wood chip C; d, hot grinding the wood chips C to obtain wet wood fibers; e, drying the wet wood fibers to obtain dry wood fibers; f, mixing the dry wood fibers with an adhesive to obtain a soft intermediate material; g, pre-pressing and trimming the soft intermediate material to obtain a front blank plate; h, hot pressing the front blank plate to obtain a rear blank plate; and i, cooling and standing the rear blank plate to obtain a finished plate. The process has the characteristic of improving the internal bonding strength of the fiberboard, so that the mechanical property of the board produced by the process is better, and the nail holding force is also improved.

Description

technical field [0001] The invention relates to a fiberboard production process, in particular to a tower pressure type wood fiber plywood process. Background technique [0002] Fiberboard is a man-made panel made by mechanically separating or chemically treating wood or plant fibers, adding adhesives, etc., and then molding under high temperature and high pressure. Because wood fibers or other vegetable fibers are broken up and then reset, various wood scraps and small woods can be used as raw materials. Therefore, the cost of fiberboard is lower than that of solid wood board, and at the same time, due to its high density, its mechanical properties are better than that of particleboard bonded by large particles. [0003] The existing fiberboard production process mainly includes the steps of crushing, cooking, drying, sizing, laying and hot pressing. The laying is to fill the mold with a mixture of wood fibers and adhesives. This molding method is prone to The uneven dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00B27L11/02B27L11/08B27N1/02B27N3/00B27N3/10B27N3/14B27N3/18B27N3/20
CPCB27K5/0085B27K2200/15B27L11/02B27L11/08B27N1/02B27N3/002B27N3/10B27N3/146B27N3/18B27N3/203
Inventor 乔为刚
Owner ZHEJIANG LIXIANG WOOD IND CO LTD
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