Veneering process suitable for PUR hot melt adhesives

A hot-melt adhesive and veneer technology, which is used in the direction of manufacturing tools, wood processing appliances, and the joining of wooden veneers to reduce the curing time, reduce the temperature of the workshop, and avoid rebound.

Inactive Publication Date: 2020-01-24
BAROQUE WOOD IND ZHONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, how to apply this PUR to multi-layer solid wood composite flooring to further make wooden flooring more safe and environmentally friendly has brought new challenges to enterprises

Method used

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  • Veneering process suitable for PUR hot melt adhesives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Balanced drying: use a balance drying kiln to carry out balanced drying on the substrate board and the wood skin, and balance to a moisture content of 8%; after balanced drying, the moisture content of the substrate board and the wood skin is the same;

[0039] Cut strips: Cut the entire substrate board (1235mm×1235mm) into multiple strips (1235mm×175mm);

[0040] Sanding: use a polishing machine to polish the slats until smooth; the abrasive belt is 320 mesh, the rotational speed of the abrasive belt wheel is 40r / min, and the plate feeding speed is 40m / min;

[0041] Glue coating: heat the PUR hot melt adhesive and coat the PUR hot melt adhesive on the surface of the slat; the heating temperature is 140°C, and the glue coating amount is 50g / m 2 ;

[0042] Veneer: Align the wood skin (1235mm×175mm×0.6mm) with the slats, and attach the wood skin to the glued surface coated with PUR hot melt adhesive to form a slab;

[0043] Flat pressing: use a row of 6 small cold press...

Embodiment 2

[0047] Balanced drying: use a balance drying kiln to carry out balanced drying on the substrate board and wood skin, and balance to a moisture content of 9%; after balanced drying, the moisture content of the substrate board and the wood skin is the same;

[0048] Cut strips: Cut the entire substrate board (1235mm×1235mm) into multiple strips (1235mm×175mm);

[0049] Sanding: use a polishing machine to polish the slats until smooth; the abrasive belt is 250 mesh, the rotational speed of the abrasive belt wheel is 37r / min, and the plate feeding speed is 40m / min;

[0050] Glue coating: heat the PUR hot melt adhesive and coat the PUR hot melt adhesive on the surface of the slats; the heating temperature is 143°C, and the glue coating amount is 65g / m 2 ;

[0051] Veneer: Align the wood skin (1235mm×175mm×2.0mm) with the slats, and attach the wood skin to the glued surface coated with PUR hot melt adhesive to form a slab;

[0052] Flat pressing: use a row of 7 small cold presses ...

Embodiment 3

[0056] Balanced drying: use a balance drying kiln to carry out balanced drying on the substrate board and wood skin, and balance to a moisture content of 10%; after balanced drying, the moisture content of the substrate board and the wood skin is the same;

[0057] Cut strips: Cut the entire substrate board (1235mm×1235mm) into multiple strips (1235mm×175mm);

[0058] Sanding: use a polishing machine to polish the slats until smooth; the abrasive belt is 150 mesh, the rotational speed of the abrasive belt wheel is 35r / min, and the plate feeding speed is 40m / min;

[0059] Glue coating: heat the PUR hot melt adhesive and coat the PUR hot melt adhesive on the surface of the slats; the heating temperature is 145°C, and the glue coating amount is 80g / m 2 ;

[0060] Veneer: Align the wood skin (1235mm×175mm×4.0mm) with the slats, and attach the wood skin to the glued surface coated with PUR hot melt adhesive to form a slab;

[0061] Flat pressing: use a row of 8 small cold presses...

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Abstract

The invention relates to the field of solid wood composite floors, in particular to a veneering process suitable for PUR hot melt adhesives. The veneering process comprises the following steps: slitting: whole substrates are cut into multiple battens; sanding: a sanding machine is used for polishing the battens smoothly; an abrasive belt is 150-320 meshes; the rotating speed of an abrasive belt wheel is 35-40 r/min; and the plate feeding speed is 40 m/min; gluing: the PUR hot melt adhesives are heated and coated on the surfaces of the battens; the heating temperature is 140-145 DEG C; and thegluing quantity is 50-80 g/m2; veneering: wood surfaces are bonded on glued surfaces with the PUR hot melt adhesives to form plate blanks; flat pressing: a cold press is used for cold pressing of theplate blanks; the pressure is 1 MPa; and the time is 3 min; and curing: the cold-pressed plate blanks are stacked; and the curing time is 24 h. The veneering process adopts the PUR hot melt adhesivesfor veneering, but not organic adhesives, so that such harmful substances as formaldehyde and benzene cannot be released, and higher environmental protectiveness and safety are achieved.

Description

technical field [0001] The invention relates to the field of solid wood composite flooring, in particular to a veneer process suitable for PUR hot melt adhesive. Background technique [0002] Solid wood composite flooring has both the stability of laminate flooring and the aesthetics of solid wood flooring, and has environmental protection advantages, and has already entered everyone's small households. However, with the continuous improvement of living standards, consumers pay more and more attention to environmental protection and safety issues, and the existing multi-layer solid wood composite flooring can no longer satisfy consumers. [0003] PUR (Polyurethane Reactive), the Chinese full name is moisture curing reactive polyurethane hot melt adhesive, is a one-component, solvent-free hot-melt structural adhesive, does not contain organic solvents. It can react with the moisture existing in the air and the moisture attached to the surface of the adherend, and extend the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/08B27G11/00B24B1/00
CPCB24B1/00B27D1/04B27D1/08B27G11/00
Inventor 林德英丁兴利朱德成苏芳惠刘君良
Owner BAROQUE WOOD IND ZHONGSHAN CO LTD
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