CN201385341Y - A solid wood composite board made of ultra-thick rotary-cut veneer - Google Patents

Abstract

The utility model provides a solid wood composite board made of ultra-thick rotary-cut veneer, which is composed of odd-numbered layers of veneer, including two outer surface layers and a core layer therebetween, and an adhesive is arranged between each layer of veneer; The core layer is composed of ultra-thick rotary-cut veneer with a thickness of 4.5mm-12mm, and the surface layer is composed of veneer with a thickness of 0.2mm-1.5mm; The veneer has point-like or line-segment cracks along the grain direction of its loose surface. The utility model uses the solid wood composite board made of ultra-thick rotary-cut veneer, and the veneer surface of the core layer is disentangled to form point-shaped or line-segment-shaped cracks, so that the composite board combined with the ultra-thick core board can still be achieved. Warping and no deformation, its performance is equivalent to that of solid wood. The ultra-thick core board can reduce the glue layer of plywood, which not only reduces the amount of glue applied, saves costs, but also reduces the amount of formaldehyde released, making this solid wood composite board more environmentally friendly. .

Description

A solid wood composite board made of ultra-thick rotary-cut veneer

technical field

The utility model relates to a composite board, in particular to a solid wood composite board made of ultra-thick rotary-cut veneer.

Background technique

At present, solid wood composite boards mainly include blockboard and multi-layer solid wood composite plywood. A special type of plywood, the core board is usually a jigsaw or lattice structure board formed by sawing logs into solid wood strips. When using this method to manufacture core boards, there is a lot of sawing loss when sawing logs, and the utilization rate of wood is low, and because the wooden strips in the combined blockboards are connected by glue in the transverse direction, the transverse static of the core board is caused. The bending strength mainly depends on the connection strength of the adhesive, so the blockboard usually cannot meet the requirements of the national standard due to the low transverse strength (Zou Linlin, Lu Bin, Yang Na Analysis of the development status and quality problems of blockboard in China, forestry machinery and woodworking Equipment, 2006, 34(5): 4-6.); multi-layer solid wood composite plywood is made of logs into veneers of 1mm to 3mm, and is made through drying, gluing, blanking, hot pressing and other processes. Because the veneer used in the composite board is thinner, to produce the same thickness of the composite board, the thinner the veneer, the more adhesive layers, the more adhesives used, resulting in increased formaldehyde emission and increased cost. Chinese patent 01133469.X proposes a multi-layer solid wood composite material made of a three-layer plywood made of veneer of 4 mm to 10 mm as a core board, which is sanded and then covered with skins on the upper and lower surfaces. Due to the large stress in the veneer of 4mm ~ 10mm, it is easy to produce warping deformation (even causing curling deformation as shown in Figure 1) and cracking during the drying process of the veneer, which seriously affects the veneer. Yield rate and subsequent processing procedures such as gluing, billet formation and other processes; secondly, the single board with this structure is used as the core board due to the excessive stress of the single board, which leads to warping and deformation of the manufactured composite board; and then Those who adopt the secondary veneer processing technology increase the veneer process.

Utility model content

The purpose of the utility model is to improve the deficiencies of the existing technology, to provide a kind of ultra-thick rotary-cut sheet whose all-directional strength conforms to the national standard, is not easy to warp and deform, is convenient to process, and has a low amount of adhesive, which can reduce the cost. Solid wood composite panels made of panels;

To achieve the above object, the utility model takes the following technical solutions:

The solid wood composite board made of ultra-thick rotary-cut veneer provided by the utility model is composed of odd-numbered layers of veneer, including two outer surface layers and a core layer in between, and an adhesive is arranged between each layer of veneer;

The core layer is composed of 4.5mm-12mm ultra-thick rotary-cut veneer, and the surface layer is composed of 0.2mm-1.5mm veneer;

The super-thick rotary-cut veneer used in the core layer is a veneer made by rotary-cutting logs, and there are point-shaped or line-segment-shaped cracks along the grain direction of the loose surface.

The above-mentioned cracks on the loose surface of the ultra-thick rotary-cut veneer of the core layer have an average length between 2.0 cm and 5.0 cm, and an average depth of 1/6 to 1/2 of the thickness of the board, or

The average length is between 2.0cm and 5.0cm, the average depth is 1/6 to 1/2 of the plate thickness, the average width is 0.2mm to 3mm, and the average distance between cracks is 0.5cm to 5cm.

The core layer is composed of 3, 5, 7, ... and other odd-numbered veneers, and adopts a parallel or cross structure to form blanks.

More specifically, there is a veneer in the center as the middle core board, and the loose surfaces of the veneers on the outside all face the middle core board, and the blanks are assembled symmetrically, and its grain can be parallel to the middle core board, or can be parallel The core boards are set vertically or staggered;

A solid wood composite board made of ultra-thick rotary-cut veneer, wherein the core layer can be made of low-quality wood such as poplar, fir, cedar, metasequoia, and spruce, which is 4.5mm to 12mm thick after rotary cutting Made of rotary-cut veneer; the surface layer can be made of decorative veneers with a thickness of 0.2 mm to 1.5 mm, which are rotary-cut from precious hard broad-leaved materials such as teak, rosewood, and clone wood.

A subsurface layer may also be included between the core layer and the surface layer. The subsurface layer is a subcore layer, also called a balance layer. The balance layer is made of a veneer with a thickness of 1 mm to 3 mm. The subcore layer The grain direction of the veneer and the core layer and the surface layer veneer are arranged vertically or alternately, and its function is to prevent the transverse warping of the core layer plate.

The veneer of the sub-surface layer can be made of common veneer with a thickness of 1 mm to 3 mm, which is rotary cut from plantation fast-growing materials such as poplar, birch or eucalyptus.

The solid wood composite board made of ultra-thick rotary-cut veneer provided by the utility model forms point-shaped or line-segment-shaped cracks by dissolving on the surface of the veneer of the core layer. Compared with the untreated veneer, it undergoes stress release treatment. Finally, point-like or line-segment cracks are formed along the grain direction of the loose surface of the veneer, which has obvious advantages: First, after the stress release treatment, the transverse stress effect of the ultra-thick rotary-cut veneer is weakened, thus avoiding veneer warpage, deformation and other issues; secondly, after the stress release treatment, the surface stress of the veneer is released, which can reduce the loss caused by veneer rupture in the subsequent drying, sizing, billet forming and other processes, Thereby improving the utilization rate of wood; moreover, after the stress release treatment, the veneer forms point-shaped or line-segment cracks, which increases the specific surface area of the veneer and greatly reduces the resistance of the wood to water discharge, thereby improving The drying rate of the veneer, which reduces the energy consumption when drying the veneer;

The utility model uses the ultra-thick rotary-cut veneer of 4.5mm-12mm, which has obvious advantages compared with the common veneer with a thickness of 1mm-3mm: compared with the ordinary multi-layer solid wood composite plywood, the solid wood of the plate is increased. It reduces the number of layers of glue layer and the amount of glue applied, thereby reducing the cost; compared with the blockboard, it reduces the loss of the sawing road when the log is cut into solid wood strips, and improves the utilization rate of wood. At the same time, due to the use of rotary cutting technology, the production efficiency is improved. In the following, the core layer is 1.2mm, 2mm, 4.5mm and 10mm thick veneer, the back panel and the front panel are respectively made of a layer of 1mm thick decorative veneer to make a solid wood composite board with a target thickness of 30mm, and the thickness of the veneer used is explained. relationship with the amount of sizing. It can be seen from Table 1 that as the thickness of the veneer increases, the amount of glue applied decreases, and the amount of glue applied to a 30mm thick veneer is only 23.07% of that of a 1.2mm thick veneer. ; If a 10mm thick veneer is used, the amount of glue applied is only 15.38% of that of a 1.2mm thick veneer. The reduction in the amount of sizing greatly reduces the production cost of the board.

Table 1 The relationship between the thickness of the veneer and the amount of glue applied

veneer thickness (mm) 1.2 2 6 10 Compression ratio (%) 10% 10% 10% 10% Plate target thickness (mm) 30 30 30 30 The number of boards required for the core layer (sheets) 25 15 5 3 Adhesive layers (layers) 26 16 6 4 Adhesive amount per adhesive layer (g/m ² ) 200 200 200 200 Total sizing amount (g) 5200 3200 1200 800

The utility model will be further described below in conjunction with specific embodiments, which are not limitations of the utility model, and any equivalent replacements in the field performed according to the disclosure content of the utility model all belong to the protection scope of the utility model.

Description of drawings

Figure 1 shows the warping deformation of a 4.5mm-12mm thick veneer without stress degradation

Figure 2 shows the 4.5mm ~ 12mm ultra-thick rotary cut veneer after stress degradation

Figure 3 Solid wood composite panels made of ultra-thick rotary-cut veneer

The symbols in the figure respectively indicate: 1 is a point or linear crack, 2 is an ultra-thick parallel-grain core plate, 3 and 4 are super-thick cross-grain core plates of the core layer, and 5 and 6 are upper and lower surface plates.

Detailed ways

Example 1

The solid wood composite board made of ultra-thick rotary-cut veneer provided by the utility model is composed of odd-numbered layers of veneer, including two outer surface layers and a core layer therebetween, and an adhesive is arranged between each layer of veneer;

The core layer may be composed of 3, 5, 7, ... and other odd-numbered veneers, and a parallel or cross structure is used to form a blank, wherein a veneer is arranged in the center as the middle core plate, and its The loose surfaces of the outer layers of veneers are all facing the middle core board, and the billets are formed symmetrically. The texture can be parallel to the middle core board, or perpendicular to or staggered with the middle core board;

In this embodiment, as shown in Figure 3, the core layer is composed of three layers of 4.5mm-12mm thick ultra-thick rotary-cut veneers 2, 3, 4, which are masson pine, eucalyptus, poplar, birch, Made of low-quality wood such as fir, cedar, metasequoia or spruce, the surface layer (decorative layer) is composed of veneers 5 and 6 with a thickness of 0.2 mm to 1.5 mm, which are precious hard broad leaves such as teak, rosewood, and clone wood material production.

The core layer ultra-thick rotary-cut veneer used is a veneer made by rotary-cutting logs, and there are point-shaped or line-segment-shaped cracks 1 in the direction of the loose surface along the grain (see Figure 2).

The cracks on the loose surface of the ultra-thick rotary-cut veneer used in the above-mentioned core layer have an average length of 2.0 cm to 5.0 cm, an average depth of 1/6 to 1/2 of its thickness, and an average width of 0.2 mm to 3 mm. , The average distance between cracks is 0.5cm ~ 5cm.

The manufacturing method of the solid wood composite board that the utility model provides with the ultra-thick rotary-cut veneer manufacturing comprises the following steps:

A. Single board production:

Low-quality wood such as masson pine, eucalyptus, poplar, birch, fir, cedar, metasequoia or spruce is rotary-cut to form an ultra-thick rotary-cut veneer of 4.5 mm to 12 mm (as shown in Figure 1). The veneer is decompressed by a debonding device, and point-shaped and/or segment-shaped cracks 1 are formed on the loose surface along the grain direction (as shown in FIG. 2 ), serving as a veneer for the core layer.

The veneers 5 and 6 of 0.4.5 mm to 1.5 mm are made of broad-leaved materials such as paulownia, birch, teak, rosewood or clone wood by rotary cutting, and used as surface decorative veneers;

B. Drying:

drying the above-mentioned veneers to a moisture content of 8% to 15%;

C. Gluing:

The adhesive used can be one of urea-formaldehyde adhesive, melamine-modified urea-formaldehyde adhesive, phenolic adhesive or isocyanate;

Sizing the ultra-thick rotary-cut veneer used in the core layer and the ordinary veneer used in the subsurface layer. When the adhesive used is urea-formaldehyde adhesive, melamine modified urea-formaldehyde adhesive or phenolic adhesive, the applied The glue amount is (150-300) g/m ² ; when the adhesive used is isocyanate, the glue amount is (20-50) g/m ² .

There is no glue applied to the thin veneer on the surface.

D. Formation:

The above-mentioned ultra-thick rotary-cut veneer coated with glue is used as the core layer, and a cross-structure blank is used, which is composed of 3 layers, 5 layers, 7 layers, ... and other odd-numbered layers, and the surface layer is 0.4.5mm~1.5 mm veneer composition, the core layer is a three-layer 2, 3, 4 cross-structure blank, and the surface veneer 5, 6 is set outside it, as shown in Figure 4. The core layer is three layers 2, 3, 4 and can also adopt a parallel structure (not shown in the figure).

E. Hot pressing:

Hot pressing is performed on the assembled billet to make it integrated.

In the hot-pressing process, an appropriate hot-pressing temperature, hot-pressing pressure and hot-pressing time are set according to the type of adhesive used.

If the adhesive is urea-formaldehyde adhesive or melamine-modified urea-formaldehyde adhesive, the sizing amount is (150-300) g/m ² , the hot-pressing temperature is (120-160)°C, and the hot-pressing pressure is (0.7-2 )MPa, the hot pressing time is (0.5~1.6)min/mm; if the adhesive is phenolic adhesive, the sizing amount is (150-300)g/m ² , and the hot pressing temperature is (130-180)℃ , the hot-pressing pressure is (0.7-2) MPa, the hot-pressing time is (0.5-2) min/mm; if the adhesive is isocyanate, the sizing amount is (20-50) g/m ² , and the hot-pressing temperature is ( 90～130)℃, the hot pressing pressure is (0.7～2)MPa, and the hot pressing time is (0.5～1.2)min/mm.

Example 2

A subsurface layer, also called a balance layer, is also arranged between the core layer and the surface layer of the solid wood composite board made of the ultra-thick rotary cut veneer described in embodiment 1, and the subsurface layer (balance layer) is a veneer with a thickness of 1 mm to 3 mm. Composed of 2 layers, that is, one layer is arranged on both sides of the core layer, which is made of plantation fast-growing wood such as poplar, birch or eucalyptus (not shown in the figure), and its function is to prevent the lateral warping of the core layer board .

When assembling the billet, two above-mentioned veneers (with a thickness of 1 mm to 3 mm) are used as subsurface layers and laid symmetrically on the outer sides of both sides of the core veneer as subsurface layers in the transverse direction.

Other processes are the same as in Example 1.

Claims (8)

1. a composite plate made from solid wood made from super thick rotary cut venner is made up of the odd-level veneer, comprises the top layer of two outer surfaces and sandwich layer therebetween, is provided with adhesive between each layer veneer; It is characterized in that:

Described sandwich layer is made up of the thick super thick rotary cut venner of 4.5mm～12mm, and the top layer is formed with the thick veneer of 0.2mm～1.5mm;

The super thick rotary cut venner of used sandwich layer is the veneer that forms through rounding, is provided with the crackle of point-like or line segment shape in the rift grain direction of its loose side.

2. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 1 is made, it is characterized in that: the crackle on the used super thick rotary cut venner loose side of above-mentioned sandwich layer, its average length is between 2.0cm～5.0cm, and mean depth is 1/6～1/2 of its thickness of slab;

Perhaps, its average length is between 2.0cm～5.0cm, and mean depth is 1/6～1/2 of its thickness of slab; Mean breadth is 0.2mm～3mm, and the average headway between the crackle is 0.5cm～5cm.

3. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 1 and 2 is made, it is characterized in that: described sandwich layer is made up of the odd-level veneer, be by 3 layers, 5 layers, 7 layers or ... layer is formed, and sandwich layer adopts parallel or chi structure assembly.

4. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 3 is made, it is characterized in that: described sandwich layer symmetrical centre is that a veneer is middle central layer, each layer loose side of its outside is all towards middle central layer, the symmetry assembly, its texture is two-layer parallel with the center, and is perhaps two-layer vertical or interlace and engage with the center.

5. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 1 and 2 is made, it is characterized in that: described sandwich layer is made up of the odd-level veneer, be by 3 layers, 5 layers, 7 layers or ... layer is formed, sandwich layer adopts parallel or chi structure assembly, time top layer is set between described sandwich layer and top layer, be also referred to as balance layer, this balance layer is made with the thick veneer of 1mm～3mm, and the veneer on this time top layer moves towards the vertical or setting that interlaces with the wood grain of sandwich layer and face ply.

6. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 5 is made, it is characterized in that: described sandwich layer symmetrical centre is that a veneer is middle central layer, each layer loose side of its outside is all towards middle central layer, the symmetry assembly, its texture is two-layer parallel with the center, and is perhaps two-layer vertical or interlace and engage with the center.

7. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 1 is made, it is characterized in that: described sandwich layer is made by low-quality timber such as poplar, China fir, cryptomeria, metasequoia or dragon spruces; Described top layer is by teak, yellow wingceltis or clone timber and make.

8. the composite plate made from solid wood that the super thick rotary cut venner of usefulness according to claim 5 is made, it is characterized in that: described top layer, the common veneer of being made by poplar, birch or eucalyptus timber constitutes.

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