Formaldehyde-free plywood of full-symmetrical structure

Abstract

The invention relates to the field of wood processing, in particular to plywood of a full-symmetrical structure. The plywood is composed of even layers of rotary cut veneers, specifically, the middle two layers of rotary cut veneers are the same in wood fiber direction and opposite in loose face and tight face, and veneers which are perpendicular to the corresponding inner veneers in fiber direction, opposite to the corresponding inner veneers in loose face or tight face, and same as the corresponding inner veneers in thickness and texture are sequentially arranged from middle to outside. Owing to the fact that the full-symmetrical even-layer structure is adopted, the stress of all layers of the plywood is mutually counteracted from middle to outside, and a more stable balancing state is achieved; and meanwhile a formaldehyde-free adhesive is adopted, and therefore formaldehyde pollution is effectively avoided.

Description

technical field

[0001] The invention belongs to the technical field of wood-based panels and their manufacture in the wood processing industry, and relates to a formaldehyde-free fully symmetrical plywood. Background technique

[0002] Plywood is one of the commonly used packaging materials for furniture and is a kind of wood-based panel. Usually, the boards are glued together according to the wood grain direction of adjacent layers perpendicular to each other. Usually, the surface board and the inner layer board are arranged symmetrically on both sides of the center layer or the board core. The slab made of the veneer after gluing is criss-crossed according to the direction of wood grain, and pressed under heating or non-heating conditions. The number of layers is generally odd, and the deployment of the elastic surface of the rotary-cut veneer is often ignored in the production process.

[0003] According to wood-based panel technology, the veneer is developed according ...

Examples

Embodiment 1

[0016] Embodiment one: if figure 1 As shown, from the center line of the plywood to both sides, layers 1 and 1-1, 2 and 2-1, 3 and 3-1, 4 and 4-1 are respectively arranged, among which 1 and 1-1 are made of the same material and have the same thickness , the wood fibers are in the same direction, and the loose side of the rotary cut veneer is opposite. 2 and 2-1 have the same material, the same thickness, and the wood fibers are in the same direction, and the loose side of the rotary-cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

Embodiment 2

[0017] Embodiment two: if figure 2 As shown, from the center line of the plywood to both sides, layers 1 and 1-1, 2 and 2-1, 3 and 3-1, 4 and 4-1 are respectively arranged, among which 1 and 1-1 are made of the same material and have the same thickness , the wood fibers are in the same direction, and the tight sides of the rotary cut veneer are opposite. 2 and 2-1 have the same material, the same thickness, the wood fibers are in the same direction, and the tight surface of the rotary cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

Embodiment 3

[0018] Embodiment 3: From the center line of the plywood to both sides, layers 1 and 1-1 are made of the same material, have the same thickness, the wood fibers are in the same direction, and the tight surfaces of the rotary-cut veneers are opposite. 2 and 2-1 have the same material, the same thickness, and the wood fibers are in the same direction, and the loose side of the rotary-cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

technical field

[0001] The invention belongs to the technical field of wood-based panels and their manufacture in the wood processing industry, and relates to a formaldehyde-free fully symmetrical plywood. Background technique

[0002] Plywood is one of the commonly used packaging materials for furniture and is a kind of wood-based panel. Usually, the boards are glued together according to the wood grain direction of adjacent layers perpendicular to each other. Usually, the surface board and the inner layer board are arranged symmetrically on both sides of the center layer or the board core. The slab made of the veneer after gluing is criss-crossed according to the direction of wood grain, and pressed under heating or non-heating conditions. The number of layers is generally odd, and the deployment of the elastic surface of the rotary-cut veneer is often ignored in the production process.

[0003] According to wood-based panel technology, the veneer is developed according ...

Examples

Embodiment 1

[0016] Embodiment one: if figure 1 As shown, from the center line of the plywood to both sides, layers 1 and 1-1, 2 and 2-1, 3 and 3-1, 4 and 4-1 are respectively arranged, among which 1 and 1-1 are made of the same material and have the same thickness , the wood fibers are in the same direction, and the loose side of the rotary cut veneer is opposite. 2 and 2-1 have the same material, the same thickness, and the wood fibers are in the same direction, and the loose side of the rotary-cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

Embodiment 2

[0017] Embodiment two: if figure 2 As shown, from the center line of the plywood to both sides, layers 1 and 1-1, 2 and 2-1, 3 and 3-1, 4 and 4-1 are respectively arranged, among which 1 and 1-1 are made of the same material and have the same thickness , the wood fibers are in the same direction, and the tight sides of the rotary cut veneer are opposite. 2 and 2-1 have the same material, the same thickness, the wood fibers are in the same direction, and the tight surface of the rotary cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

Embodiment 3

[0018] Embodiment 3: From the center line of the plywood to both sides, layers 1 and 1-1 are made of the same material, have the same thickness, the wood fibers are in the same direction, and the tight surfaces of the rotary-cut veneers are opposite. 2 and 2-1 have the same material, the same thickness, and the wood fibers are in the same direction, and the loose side of the rotary-cut veneer is opposite; the fiber directions of layer 2 and layer 1 are perpendicular to each other.

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