JP2000117709A - Composite woody base and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a base for a decorative sheet of superior surface properties by splitting small diameter woods, bamboos, flitches produced in lumbering and waste building materials and using split piece laminated materials as a core material manufactured by applying a bonding agent on the split materials and pressing it. SOLUTION: In a manufacturing method for a composite woody base, the base is manufactured by bonding a plurality of single layers formed of small split materials formed of raw materials such as woods, bomboos, waste building materials and others split in the longitudinal fiber direction, drying and then applying a bonding agent and arranging them in parallel in the longitudinal direction, to form a split base laminated material layer 1 formed of respective split materials in the pressurized state set and bonded by a bonding agent and sticking one kind selected out of a veneer, a medium density fiber plate (MDF) and a thin particle board on the surface and the back or on the surface of the core layer. Also in the stage of manufacturing the slit piece laminated material layer or layers on the surface and the back of the core layer, a woody fiber mat, on the surface of which a powdery bonding agent is added, is spread on the layer, and at the same time the layer is heat-pressed to be formed into the composite woody base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite wood substrate using split wood laminates obtained by using small-diameter wood, bamboo, backboard derived during lumbering, construction waste, and the like, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, the shortage of wood resources and the protection of forests on a global scale have become problems, and there has been a tendency that cutting down forests to obtain wood resources is greatly restricted.

[0003] In order to make effective use of small-diameter trees, bamboos, backboards and construction waste materials derived during lumbering, which have not always been effectively used so far, they are split into fibers in the longitudinal direction and are called strands. A chopstick-shaped wooden material is obtained, a thermosetting resin adhesive such as phenolic resin is applied to the wooden material, and a large number of the materials are laminated and hot-pressed with a steam injection press, a high-frequency press, or a hot press. A method for producing a plate-like wood material having an area and an apparatus therefor are disclosed in JP-A-7-195313.

[0004]

However, the split piece laminated material obtained by the above-mentioned prior art can not be said to have a good appearance even if it can be a substitute for a large-section laminated wood, and the column or stud material can not be said. As unsuitable.

[0005] The present invention uses a wood split piece laminate,
It is an object of the present invention to provide a composite wood substrate excellent in surface properties and a method for producing the same.

[0006]

According to a first aspect of the present invention, there is provided a method for splitting raw materials such as wood, bamboo, and building waste in the longitudinal direction of a fiber, drying and bonding the raw materials. Split pieces obtained by joining a plurality of single layers in which the agent-applied split materials are juxtaposed in the longitudinal direction in the horizontal and vertical directions, and solidifying and bonding each split material with an adhesive in a pressurized state Plywood, medium density fiberboard (MD
F) and one of thin particle boards is characterized by a composite wood base material in which the core material is adhered to the front and back surfaces of the core material.

According to a second aspect of the present invention, a split material obtained by splitting a raw material such as wood, bamboo, and construction waste material in the longitudinal direction of the fiber, drying the material, and then applying an adhesive is juxtaposed in the longitudinal direction. A plurality of single layers are joined in the horizontal and vertical directions, and each split material is solidified and bonded by an adhesive in a pressurized state to obtain a split piece laminated material layer, and heat is applied to the front and back surfaces of the split piece laminated material layer. Plywood, medium density fiberboard (M
DF) and one kind selected from thin particle board is attached to the front and back surfaces of the core material.

According to a third aspect of the present invention, the adhesive is a thermosetting synthetic resin adhesive or a thermoplastic synthetic resin adhesive which is thermally foamed into a hot melt type adhesive or a honeymoon type two-part type instant adhesive. The method for producing a composite wood substrate according to claim 2, wherein the body is mixed.

According to a fourth aspect of the present invention, a split material obtained by splitting a raw material such as wood, bamboo, and construction waste material in the longitudinal direction of the fiber, drying and applying an adhesive is juxtaposed in the longitudinal direction. The core material is a split piece laminate material layer in which multiple single layers are joined in the horizontal and vertical directions, and a wood fiber mat added with a powder adhesive is laminated on the front and back surfaces thereof, and simultaneously pressed and formed by a steam injection press. It is characterized by a composite wood substrate having a wood fiber layer on the surface layer obtained as described above.

According to a fifth aspect of the present invention, a raw material such as wood, bamboo, construction waste, or the like is split in the longitudinal direction of the fiber, dried, and then the divided material to which an adhesive is applied is juxtaposed in the longitudinal direction. A wood fiber mat to which a powder adhesive has been added when joining a plurality of single layers in the horizontal and vertical directions and solidifying and bonding each split material with an adhesive in a pressurized state to obtain a split piece laminate material layer Are laminated on the front and back surfaces of a block in which a plurality of the above-mentioned single layers of the split material are joined in a horizontal direction and a vertical direction, and are simultaneously hot-pressed and formed by a steam injection press.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Since the present invention has the constitution described above, it can provide a base material for decorative plywood having excellent surface smoothness and high surface hardness at low cost and can also help protect the global environment. .

Hereinafter, the present invention will be described in detail with reference to the drawings according to a preferred embodiment. 1 and 2 show a composite wood base material of the present invention.

In FIG. 1, reference numeral 1 denotes a split piece laminated material layer, which is obtained by splitting a raw material such as wood, bamboo, and construction waste material in the longitudinal direction of the fiber, drying the material, and applying an adhesive thereto. A plurality of single layers juxtaposed in the longitudinal direction are joined in a horizontal direction and a vertical direction, and each split material is solidified and joined by an adhesive in a pressurized state.

Reference numeral 2 denotes a surface layer material. In this embodiment, for example, a 2.5 mm thick plywood or medium density fiberboard (M
DF: Medium Density Fiberbo
ard) or a thin particle board is applied.

The split piece laminated material layer 1 splits a back plate or construction waste material derived from small-diameter wood, bamboo, or wood lumber in the longitudinal direction of the fiber with a slitter, and further splits the split into smaller pieces. After drying as a material, an adhesive is applied and juxtaposed in the longitudinal direction to form a single layer, and the single-layer laminated material layer is obtained by heating and pressing a plurality of finely divided material layers.

The split piece laminate thus obtained has a bending strength of 350 kgf / cm ^{2 to} 700 kgf / cm ² and a horizontal shear strength of 70 kgf / cm ^{2 to} 80 kgf / cm.
^{2. The} bending Young's modulus is 70,000 kgf / cm ² -12
It has a strength characteristic of 000 kgf / cm ² .

Thus, the split piece laminate is sufficiently usable as a substitute for the large-section laminated wood. However, the appearance is not always good, and it is not suitable as a pillar or a stud material. Overcoming this point is the key to effectively utilizing small-diameter wood, bamboo, or a backboard or construction waste derived at the time of lumbering, which has not always been effectively utilized.

Therefore, in the present invention, a split piece laminated material is used as a core layer, and a 2.5 mm
A plywood having a thickness, a medium density fiberboard (MDF) or a thin particle board is attached as the surface layer material 2.

When a plywood, a medium density fiberboard (MDF) or a thin particle board is attached to the front and back surfaces of the split piece laminated material layer 1, a thermosetting synthetic resin such as an amino-based, phenol-based or urethane-based resin is used. An adhesive or a thermoplastic synthetic resin adhesive such as an ethylene-vinyl acetate copolymer or a rubber-based adhesive is used. Among them, the split-piece laminated material layer 1 is porous, so that a hot-melt adhesive or a honeymoon two-part adhesive is used. It is desirable to apply the adhesive within a very short time with an instant adhesive.

Further, in order to fill the porous portion of the split piece laminated material layer 1, an adhesive mixed with a thermal foam is applied, and a plywood or a medium density fiber board ( M
DF) or it is preferable to attach a thin particle board.

The surface of the composite wood base material having a smooth surface can be easily decorated, and can be made into a decorative board by sticking a decorative sheet such as a decorative veneer, decorative paper, or a synthetic resin film. . Such a decorative board can be used, for example, as a step board for stairs.

Next, an embodiment of the present invention in which a wood fiber mat layer is formed on the front and back surfaces of the split piece laminated material layer will be described. FIG. 2 shows a longitudinal section of an embodiment of the present invention described in claim 4.

In FIG. 2, reference numeral 11 denotes a split piece laminated material layer, which is the same as the split piece laminated material layer 1 described above. 12
Is a wood fiber mat, which is used, for example, for wood-based door rims of automobiles.

In this embodiment, a small-diameter tree, bamboo, or a back plate or construction waste material derived during lumbering is split along the longitudinal direction of the fiber by a slitter, and further split into smaller pieces. After drying as a material, an adhesive is applied to form a single layer juxtaposed in the longitudinal direction to form a single layer, and the single layer is laminated on a plurality of layers. At this time, the wood fiber mat to which the powder adhesive has been added is arranged on the front and back surfaces of the split piece laminated material layer 11, and simultaneously pressed and formed by a steam injection press.

[0025]

Example 1 A small-diameter tree, bamboo, or a backboard or construction waste material derived during lumber sawing was split along a longitudinal direction of a fiber with a slitter to obtain a 10 mm-thick split chopstick-like split piece. Was further cut into 4 mm × 10 mm sections using a slitter.

Next, the above-mentioned split material is charged into a dryer,
Drying was performed at a wind speed of 10 m / s for 5 to 20 minutes in a temperature range of 180 ° C to 200 ° C. The obtained split material was spray-coated with a phenol resin adhesive in a rotating drum at 10% by weight of the split material.

The obtained adhesive-coated split materials are juxtaposed in the longitudinal direction to form a single layer.
It was set as a split piece laminated mat of mm to 130 mm. At the time of laminating the single layers, the layers were laminated so that the ends in the longitudinal direction were shifted from each other, and the ends did not match in the laminating direction.

The split mat thus obtained is pressed by a steam injection press at a pressure of 42 kgf / cm ² , a steam temperature of 160 ° C., a steam injection time of 5 minutes, and a total compression time of 14 minutes. Depressurized and cured.

[0029] An obtained ethylene-vinyl acetate copolymer having a thickness of 25 mm to 30 mm as a core layer and a medium density fiberboard (MDF) of 2.5 mm thickness on the front and back surfaces of the core layer. It was arranged via an adhesive mixed with a thermal foam containing (EVA) as a main component, and adhered to form a decorative board substrate.

Example 2 A single layer was formed by juxtaposing adhesive-applied split materials obtained in the same process as in Example 1 in the longitudinal direction, and the single layers were sequentially laminated to a thickness of 130 mm. Mat.

Prior to the formation of this mat, a wood fiber mat to which 10% (weight%) of a powdered phenol resin was added was laid on the lower surface of the adhesive-applied split material laminated mat,
On the other hand, a wood fiber mat to which 10% (weight%) of the powdered phenol resin was added was placed on the upper surface of the adhesive-applied split material laminated mat, and was simultaneously pressed and formed by a steam jet press.

The conditions of the steam injection press were as follows: pressure: 42 kg
f / cm ² , steam temperature: 160 ° C., steam injection time: 5 minutes, total compression time: 14 minutes. The obtained composite wood base material had good entanglement between the fiber and the split piece laminated material (strand), and had high peel resistance at the interface.

[0033]

According to the present invention, as described above, a composite wood base material having excellent surface properties can be manufactured at low cost, and small-diameter wood which has not been effectively used until now can be manufactured.
Utilizing bamboo or a backboard derived during lumbering or construction waste, etc., it is possible to reduce the amount of deforestation and to help protect the global environment.

According to the first, second and third aspects of the present invention, a composite wood substrate of a split piece laminate (strand) having a small dimensional change and a plywood, a medium density fiberboard (MDF) or a thin particle board is provided. Can be obtained.

Further, a material obtained by adhering a medium-density fiberboard (MDF) to a split piece laminated material (strand) can be used as a decorative base material having excellent surface properties and high surface hardness.

According to the invention described in claims 4 and 5,
Since the process of laminating the wood fiber mat is incorporated into the split piece laminated material (strand) production process, simultaneous compression molding becomes possible, and the production cost can be further reduced.

Further, since the split piece laminated material (strand) is pressed simultaneously with the wood fiber mat, the entanglement between the fiber and the split piece laminated material (strand) is improved, and the peeling strength at the interface is greatly improved. .

[Brief description of the drawings]

FIG. 1 shows plywood and medium density fiberboard (M
DF) or a perspective view showing a composite wood substrate of the present invention in which thin particle boards are laminated.

FIG. 2 is a front view showing an embodiment of the present invention in which a process of laminating a wood fiber mat on a split piece laminated material (strand) layer is performed simultaneously with a process of forming a split piece laminated material (strand) layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split piece laminated material layer 2 Surface layer material 11 Split piece laminated material layer 12 Wood fiber mat

Continued on the front page F-term (reference) 2B241 DA01 2B260 AA07 BA01 BA05 BA07 BA18 BA20 CB01 CB04 CD02 DA01 DA04 DA07 DA17 DA18 DD02 EA01 EA05 EB05 EB06 EB11 EB12 EB19 EB42

Claims (5)

[Claims] [Claim 1] A raw material such as wood, bamboo, construction waste, etc. is split in the longitudinal direction of a fiber, dried, and then a divided material to which an adhesive is applied is applied. A plywood, medium-density fiberboard (MDF) or thin particle board is used as a core, with a split-piece laminated material layer obtained by joining a plurality of split materials in a vertical direction and solidifying and bonding each split material with an adhesive in a pressurized state. A composite wood substrate obtained by sticking one of the obtained types on the front and back surfaces or the front surface of the core material. 2. A raw material such as wood, bamboo, construction waste material, or the like, which is split in the longitudinal direction of the fiber, dried, and coated with an adhesive. A plurality of split materials are joined in the vertical direction and each split material is solidified and bonded by an adhesive in a pressurized state to obtain a split piece laminated material layer, and a thermosetting synthetic resin adhesive or Plywood, medium density fiberboard (MDF) with thermoplastic synthetic resin adhesive
And bonding one kind selected from thin particleboard to the front and back surfaces or the front surface of the core material. 3. The adhesive is a thermosetting synthetic resin adhesive or a thermoplastic synthetic resin adhesive obtained by mixing a hot melt type adhesive or a honeymoon type two-part type instant adhesive with a thermal foam. The method for producing a composite wood substrate according to claim 2. 4. A single layer formed by juxtaposing raw materials such as wood, bamboo, and building waste material in the longitudinal direction of the fiber, drying, and then applying an adhesive, and forming a single layer in the longitudinal direction. The core is a split piece laminate material layer that is joined in multiple directions in the vertical direction, and a wood fiber mat with powder adhesive added to the front and back surfaces. A composite wood substrate comprising a layer. 5. A single layer obtained by juxtaposing raw materials such as wood, bamboo, and construction waste material in the longitudinal direction of the fiber, drying and splitting the divided materials to which an adhesive is applied, and forming a single layer in the horizontal direction. At the time of joining a plurality of split materials in the vertical direction and solidifying and bonding each split material with an adhesive in a pressurized state to obtain a split piece laminated material layer, the wood fiber mat to which the powder adhesive is added is mixed with the split material single layer. Are laminated on the front and back surfaces of a plurality of blocks joined in a horizontal direction and a vertical direction, and are simultaneously hot-pressed and formed by a steam injection press.