Plywood and preparation method thereof

A technology for plywood and veneer, applied in the field of plywood manufacturing, can solve the problems of increased production cost and environmental pollution treatment cost of anti-corrosion and flame-retardant plywood, the mechanical properties of plywood are difficult to meet the requirements for use, and the performance of anti-corrosion and flame retardant can not be achieved at the same time. , to achieve the effects of controllable immersion depth, less immersion drug dose, and improved service life

Active Publication Date: 2017-06-13
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the production process, the produced plywood generally only has anti-corrosion or flame-retardant properties and cannot have both anti-corrosion and flame-retardant properties.
At the same time, due to the presence of preservatives and flame retardants in the veneers, they affect the bonding performance between the veneers of the plywood, resulting in a decrease in the strength of the plywood, so the mechanical properties of the plywood for structural use are difficult to meet the use requirements
In addition, the commonly used process of pre-impregnating the veneer at present leads to the full impregnation of all the veneer layers of the plywood, which makes the drug loading too large, and the surface layer of the plywood plays the main role of anticorrosion or flame retardancy, and the core part of the plywood is single. The chemical effect of the board is small, resulting in an increase in the production cost of anti-corrosion and flame-retardant plywood and the cost of environmental pollution treatment

Method used

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  • Plywood and preparation method thereof
  • Plywood and preparation method thereof
  • Plywood and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0071] The method for preparing plywood that the embodiment of the present application provides, such as Figure 4 As shown, can include:

[0072] Step 102: Select the veneers needed for plywood coniferous wood veneer layer 1 and plywood hardwood veneer layer 2;

[0073] Step 104: drying the selected veneer and applying adhesive;

[0074] Step 106: superimposing the veneers, pre-cold pressing and then hot pressing or curing after hot pressing;

[0075] Step 108: preparing preservatives and / or flame retardants;

[0076] Step 110: impregnating the cured slab in a preservative and / or flame retardant under vacuum or vacuum-pressurized conditions;

[0077] Step 112: drying the impregnated slab;

[0078] Step 114: maintenance.

[0079] Wherein, step 104 may be to dry the veneer to a moisture content of 3-12% by mass, and then apply adhesive on both sides, and the total coating amount of the adhesive between the veneers may be 200-12% by mass. 300g / m 2 ;

[0080] Step 106 can...

Embodiment 1

[0087] Such as figure 1 As shown, the plywood of this embodiment includes two plywood coniferous wood veneer layers 1 , five plywood broadleaf wood veneer layers 2 and two plywood anticorrosion and flame-retardant layers 12 . Among them, the surface layer of the plywood is plywood coniferous wood veneer layer 1, and the other five layers are plywood broad-leaved wood veneer layer 2, and the thickness of any single veneer layer is not less than 2mm. The wood grain direction of the plywood coniferous wood veneer layer 1 is parallel to the length direction of the plywood, the wood grain direction of the plywood hardwood veneer layer 2 in the center layer is parallel to the length direction of the plywood, and the other four plywood hardwood veneer layers 2 have the wood grain in the same direction and at a 90° angle to the length of the plywood. The veneer on the surface of the plywood contains preservatives.

[0088] Wherein, the veneer layer 1 of the plywood coniferous wood is ...

Embodiment 2

[0091] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that: the plywood anticorrosion and flame-retardant layer 12 has four layers, and the surface of the plywood has two layers of veneers that contain preservatives.

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Abstract

The invention discloses a plywood and a preparation method thereof. The plywood comprises multiple layers of veneers; and one or more layers of veneers on the surface of the plywood contain preservatives and/or flame retardants. The method comprises the following steps: adhesive is coated on the surfaces of the veneers; the veneers are laminated for hot pressing after cold prepressing, or the adhesive is cured by hot pressing; and finally, through impregnation, one or more layers of veneers on the surface of the plywood contain the preservatives and/or the flame retardants. The plywood is excellent in corrosion resistance, can synchronously achieve corrosion and flame resistance, and is controllable in inpregnation depth, low in needed impregnation medicine quantity, high in gluing strength, excellent in water resistance and excellent in size stability.

Description

technical field [0001] The present application relates to but not limited to the field of plywood manufacturing technology, in particular to but not limited to a kind of plywood and its preparation method. Background technique [0002] Structural plywood (structure plywood) refers to plywood that can be used as a load-bearing structure of a building and has durability, such as plywood used as a frame cladding panel in walls, floors and roofs in light wood structures as "Wall Panel", "Floor Panel", "Roof Panel"). Structural plywood, as an important wood engineering material, has the advantages of high strength, good dimensional stability and good processing performance, and is widely used in the field of wood structure construction. Plywood used in outdoor environments, such as exterior wall panels, roof panels, and ground floor panels, is vulnerable to rain, condensation, and humid air, which will cause it to rot and reduce its strength, affecting safety in use. By using c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/08B27D5/00B27K3/08B32B7/12B32B37/12B32B21/13B32B37/06B32B37/10B32B37/08
CPCB27D1/04B27D1/08B27D5/00B27K3/08B27K2240/20B27K2240/30B32B7/12B32B21/13B32B37/06B32B37/08B32B37/10B32B37/12B32B2307/3065B32B2307/714B32B2307/73B32B2307/734B32B2419/00
Inventor 王朝晖蒋明亮田昭鹏任海青
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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