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Method for producing formaldehyde-free low-density crop straw grain board

A low-density, crop-based technology, applied in the direction of manufacturing tools, flat products, pretreatment of molding materials, etc., to reduce costs and reduce material consumption

Active Publication Date: 2007-09-19
SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of manufacture method of formaldehyde-free low-density crop straw particle board, solves the problem that the production density is lower than 400kg / m 3 The raw material composition of wood-based panels and the technical problems of hot pressing methods, followed by the technical problems of spraying glue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1. make density 250kg / m with the present invention 3 Straw particle board with a density and thickness of 50mm.

[0022] Particle size (mm)

[0023] Carry out weighing the amount of material that the hot press drops into once, then put the weighed stalk particles into the mixer, and spray into the binder with a particle diameter of less than or equal to 5 μ under the stirring condition. What the present invention uses is a formaldehyde-free The isocyanate binder, such as the adhesive with the trade name of MDI, requires a stirring coefficient of difference ≤ 10%, and then the evenly stirred straw particles are placed on the liner, and the spraying amount is 2.5% to 2.5% of the dry weight of the straw. 3%, the weight error of laying is controlled within ±1kg, and the density uniformity is controlled within ±8%. . The slab together with the liner is sent into the hot press for heating, pressurized to a thickness of 50mm and solidified to form a raw ...

Embodiment 2

[0024] Embodiment 2. manufacture density with the present invention is 330kg / m 3 , Straw particle board with a thickness of 25mm.

[0025] Particle size (mm)

[0026]Carry out weighing the amount of material that hot press machine drops into once, put the stalk particle of this weighing into mixer then, spray into the MDI glue that particle diameter is less than 5 μ under agitation condition, and the injection amount is 2.5% of the dry weight of stalk granule. %~3%, the difference coefficient of stirring is ≤10%, and then lay the evenly stirred straw particles on the lining board, the weight error of laying is controlled within ±1kg, and the density uniformity is controlled within ±8%. Use a 100-140 ton press to pre-press, so that the straw particles on the lining board form a preliminary slab. The slab together with the liner board enters the hot press machine, heated and pressurized to a thickness of 25mm, solidified and formed into a raw board, and the temperatur...

Embodiment 3

[0027] Embodiment 3. manufacture density with the present invention is 400kg / m 3 1. Straw particle board with a thickness of 5mm.

[0028] Particle size (mm)

[0029] Carry out the measuring material that takes hot press once to drop into by weighing, put the stalk granule of this weighing into mixer then, spray into the MDI glue that particle diameter is less than or equal to 5 μ under agitation condition, the injection amount is 2.5% of the dry weight of stalk granule. %~3%, the difference coefficient of stirring is ≤10%, and then lay the evenly stirred straw particles on the lining board, the weight error of laying is controlled within ±1kg, the density uniformity is controlled within ±8%, and the laying Finally, pre-press with a press of 100 to 140 tons, so that the straw particles on the lining board form a preliminary slab. The slab together with the liner board enters the hot press machine, heated and pressurized to a thickness of 5 mm and solidified to form ...

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Abstract

A making method of crop straw particle board of low density without formaldehyde includes crushing, taking materials and weighting by balance, paving, stirring of spray glue, prepressing and hot-pressing of the crop straw, characterized in that: the crop straw should crush to particle state of less than or equal to 4.75mm, after calculating weight of straw particle with density of 250-400kg / m3 based on thickness of board and once machining area of apparatus, taking materials by weight of following components, the hot-pressing temperature is 130-180 DEG C, through two times of increasing and reducing press hot set from high to low, at first time the press is increased to 90-110 bar during 10 seconds, keeping for 25 seconds, then the press is reduced to 40-60 bar, then second increasing press to 80-100 bar, keeping for 30 seconds, then three times of reducing press by speed of 1-3 bar / second, at last stabilizing the press in 10-20 bar, keeping for 10 seconds. The invention settles technological problem of hot-pressing mode and material compositions of artificial plate with production density less than 400kg / m3, secondly settles technological problem of spray glue.

Description

Technical field: [0001] The present invention relates to the manufacture of articles with organic binders similar to wood fibers by a dry method, especially a method for making formaldehyde-free low-density crop straw particle boards from crop straws. Background technique: [0002] Due to the continuous shrinking of forest resources and the continuous increase of people's protection of forest resources, the industry is constantly seeking new material resources while making full use of discarded shavings, sawdust and leftover materials in wood processing to manufacture wood-based panels. Among them, some progress has been made in the use of crop stalks, especially the use of formaldehyde-free isocyanate adhesives to manufacture high-strength wood-based panels. For example, the applicant of the present invention applied on June 12, 2006, the patent number is ZL03129224.0, and the title is "Manufacturing method of formaldehyde-free high-strength wood-based panels". Stir and mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N1/00B27N1/02B27N3/08B27N7/00
CPCY02A40/28
Inventor 王步宁马俊夏定权高翔刘永臣王建中
Owner SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD
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