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Rapid hot-press forming method for laminated wood

A hot-press forming and glulam technology, which is used in the construction industry, the material manufacturing of the decoration industry, and the furniture field, can solve the problems of increasing production energy consumption and cost, reducing the production efficiency of glulam, and low heat transfer and forming efficiency. Effect of bond strength and productivity, effective heating, length of heating time

Inactive Publication Date: 2019-11-05
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary hot pressing is mainly heated by heat conduction, that is, heat is transferred from the surface to the interior through conduction. Due to the slow heat conduction rate of wood, long heating time, and low heat transfer and forming efficiency, the production efficiency of glulam will be reduced and its production will be increased. Energy Consumption and Cost
And long heating time will affect the strength of surface wood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Send the wood (poplar) small material that has been mechanically processed into an ordinary wood drying kiln to dry to a moisture content of 5%;

[0040] 2. Prepare a urea-formaldehyde resin adhesive with a solid content of 50%;

[0041] 3. Lay the dried small wood materials into squares or panels of certain specifications according to the gluing and blanking process in the production process of ordinary glulam, and the amount of gluing is 220g / m 2

[0042] 4. Clamp the paved specification square material or sheet through a three-dimensional metal fixture with a clamping force of 2.5MPa;

[0043] 5. Send the clamped square or plate together with the fixture into the wood microwave heating machine, the heating time is 8min, the heating temperature is 130°C, and the microwave frequency is 1.8GHz;

[0044] 6. Take out the fixture of the hot-pressed square or sheet to obtain a certain specification of shaped glulam and stack it for storage.

[0045] Compared with ordi...

Embodiment 2

[0048] 1. Send the wood (eucalyptus) small material processed through mechanical processing into a common wood drying kiln to dry to a moisture content of 6%;

[0049] 2. Prepare a urea-formaldehyde resin adhesive with a solid content of 45%;

[0050] 3. Lay the dried small wood materials into squares or panels of certain specifications according to the gluing and blanking process in the production process of ordinary glulam, and the amount of glue applied is 190g / m 2

[0051] 4. Clamp the paved specification square material or sheet through a three-dimensional metal fixture with a clamping force of 2.0MPa;

[0052] 5. Send the clamped square or plate together with the fixture into the wood microwave heating machine, the heating time is 6min, the hot pressing temperature is 150°C, and the microwave frequency is 2.0GHz;

[0053] 6. Take out the fixture of the hot-pressed square or sheet to obtain a certain specification of shaped glulam and stack it for storage.

[0054] Com...

Embodiment 3

[0057] 1. Send the wood (pine wood) small material that has been machined into an ordinary wood drying kiln to dry to a moisture content of 8%;

[0058] 2. Prepare a urea-formaldehyde resin adhesive with a solid content of 60%;

[0059] 3. Lay the dried small wood materials into squares or panels of certain specifications according to the gluing and blanking process in the production process of ordinary glulam, and the amount of gluing is 250g / m 2

[0060] 4. Clamp the paved specification square material or sheet through a three-dimensional metal fixture with a clamping force of 1.5MPa;

[0061]5. Send the clamped square or sheet together with the fixture into the wood microwave heating machine for 5 minutes, the hot pressing temperature is 180°C, and the microwave frequency is 2.5GHz;

[0062] 6. Take out the fixture of the heated square or sheet to obtain a certain specification of shaped glulam and stack it for storage.

[0063] Compared with ordinary hot pressing moldin...

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PUM

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Abstract

The invention discloses a rapid hot-press forming method for laminated wood. The method comprises the following steps that small wood materials through mechanical machining are dried until the moisture content is 5wt%-8wt%; the dried wood small materials are coated with adhesive and assembled to be paved into a square material or a board material, wherein the adhesive used by the adhesive coatingis water-soluble adhesive with the solid content of 45wt%-60wt%; the square material or the plate material is clamped by a metal three-dimensional clamp; and the clamped square material or plate material are fed into a microwave heating machine together with the clamp to be subjected to microwave heating to obtain formed laminated wood, and the time from the adhesive coating to entering the microwave heating machine is controlled to not exceed 15 min. According to the rapid hot-press forming method for the laminated wood, rapid, accurate and effective heating can be realized on bonding parts needing to be heated, the bonding strength and the production efficiency of the laminated wood can be remarkably improved, and the production energy consumption cost is reduced.

Description

technical field [0001] The invention belongs to the field of material manufacturing in the construction industry, furniture and decoration industry, and in particular relates to a rapid hot-press forming method for glued materials. Background technique [0002] Glulam uses small-diameter wood as the raw material for production, and is machined into boards, and then dried, split, cut, selected, sliced, finger-jointed, spliced, and post-processed to make a certain width, Thickness and length of wood small material, with the characteristics of small material, high strength, etc., can be used in construction industry, furniture, decoration industry and other fields. [0003] In the production process of glulam, after the length, width and thickness of small materials are joined, they need to be sent to a hot press for hot pressing to cure the adhesive and form them. Ordinary hot pressing is mainly heated by heat conduction, that is, heat is transferred from the surface to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27D5/00
CPCB27D1/08B27D5/00B27D3/02B27N3/02B27N3/18B27N3/203C08L97/02C09J161/24C08L61/24B27N3/002
Inventor 郑霞李新功吴义强李贤军卿彦左迎峰刘明
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY