JPH106312A - Wooden material and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent strength and to easily perform nailing by embedding rolled substance of wood among a number of chipped pieces of wood and bonding integrally them with a thermosetting adhesive. SOLUTION: A sheet-like extended substance 2 of wood is embedded in a wavy sheet-like state among chipped piece monolayers 3 and 3 facing to each other so as to make the faces coated with an isocyanate adhesive inside and they are laminated and pressed by hot press contact and they are integrally made in a body by curing the isocyanate adhesive to obtain a wooden material 4. The wooden material 4 holds properties of JAS mechanical class section E90 (e.g. bending Young's modulus of 90,000kgf/cm<2> ) and nailing can be enough performed by a pressure of a nailing machine of about 4kgf/cm<2> and nail holding force (based on JIS Z 2121) is good.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-based material composed of split wood pieces and a method for producing the same.

[0002]

2. Description of the Related Art Heretofore, as a wood-based material, a lumber product obtained by cutting a raw wood into a predetermined size and shape has been generally used. Since these sawn products are usually sawn by saws or the like, sawdust is generated, the utilization efficiency as the material is low, and it is difficult to say that resources are effectively used. Further, lumber products have many defects such as knots, so that their performances vary widely.

In view of these points, for example, Japanese Patent Laid-Open No.
As described in Japanese Patent No. 95313, wood is split in the longitudinal direction into a large number of split pieces, and a thermosetting adhesive is applied to the split pieces and shaped into a plate or a rod. There has been proposed a method for producing a wood-based material in which an adhesive is cured by applying heat and pressure. According to this method, a very high-strength wood-based composite material can be obtained with little loss of sawdust and the like.

[0004]

However, in this method, the raw material is split, the split pieces are aligned to form a single layer, and the single layer is laminated to obtain a molded article. In the case of the molded article obtained in this way, the contact area between the single layers is small, the adhesion area between the single layers is small, large adhesive strength cannot be exhibited, and the gap between the split pieces is inevitable. When the nail is hit, cracks occur between the split pieces, and the nail holding force is reduced.

[0005] Further, when the split pieces are greatly compressed to exhibit a large adhesive strength, the density of the obtained molded article becomes large, resulting in a large resistance to nailing. There is a point.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a wood-based material which can effectively utilize wood resources, is excellent in strength, and can be easily nailed, and a method for producing the same. It was done.

[0007]

According to the invention of claim 1 of the present application (hereinafter referred to as invention 1), a rolled product of wood is embedded between a number of split pieces of wood and a thermosetting adhesive is used. It is a wood-based material that is integrally joined.

[0008] The invention of claim 2 of the present application (hereinafter, referred to as "invention 2") is the invention of the present invention 1 in which the rolled wood is corrugated.
Wood-based material.

[0009] The invention of claim 3 of the present application (hereinafter, referred to as invention 3) is a method for separating between a large number of split pieces obtained by splitting wood.
This is a method for producing a wood-based material in which a rolled product of wood is sandwiched via a thermosetting adhesive and heated to harden the thermosetting adhesive to integrate it.

The invention according to claim 4 of the present application (hereinafter referred to as the present invention 4) is a method of producing a wood-based material of the present invention 3 in which a rolled product of wood is corrugated and integrated with a large number of split pieces of wood. It is a manufacturing method.

In the present invention 1 to present invention 4 (hereinafter collectively referred to as the present invention), known wood can be used as a raw material. For example, cedar, cypress, pine, toga, straw, fir, Birch, oak, lauan, falcata, chamelere,
Rajtapine, aspen, lark, chestnut, zelkova, vertebra,
Willow, bamboo, and the like. Such lumber may not be lumbered, and may be used such as lumber offcuts, backboards, small diameter trees, twigs, etc., building offcuts, waste wood, thinned lumber, and the like.

The cross section of the split piece is 0.1 to 10 m in length and width.
m and the length are preferably from 20 to 1000 mm. If it is too short, it is difficult to obtain strength as a thick product, and if it is too long, it becomes difficult to obtain raw materials and handle split pieces.

In the present invention, as a knife used for splitting wood to produce split pieces, a known knife which is usually used as a knife can be used. No. Examples of the material of the blade include steel, stainless steel, molybdenum steel, and the like. The outer diameter of the blade can be appropriately determined according to the size of the raw material wood. The tip angle of the blade is preferably in the range of 15 to 45 degrees. The hardness of the blade is preferably in the range of 25 to 55 HRC.

In the present invention, as a method for producing a rolled product by rolling wood, a known method such as a roll method or a press method can be employed. For efficient rolling, it is preferable to use a pair of rolls 1 and 1 having peaks and valleys whose surfaces mesh with each other, as shown in FIG.

Usually, the rolled material is used in the form of a sheet. In the present invention 4, as shown in FIG. 3, the rolled sheet material is arranged in a corrugated sheet and used. It is also possible to use a pre-processed corrugated sheet.

(Operation) The wood-based material of the present invention 1 has a large number of split pieces of wood, in which a rolled piece of wood is embedded and integrally joined by a thermosetting adhesive. Since the split pieces of wood are joined by a rolled wood product via a thermosetting adhesive in a state where the bonding area is increased, the wood has high bonding strength. And because it is not necessary to apply a large compressive force, the density is not excessively large,
Good nailing workability.

The woody material according to the second aspect of the present invention is further characterized in that the rolled product of the wood is a corrugated plate, so that a large number of split pieces of the wood are thermoset by the rolled product of the corrugated wood. The bonding is performed in a state where the bonding area is increased via the adhesive.

The method for producing a wood-based material according to the third aspect of the present invention is the method for producing a wood-based material, wherein a rolled piece of wood is sandwiched between a large number of split pieces obtained by splitting wood via a thermosetting adhesive, and heated. By hardening the curable adhesive and integrating it, without applying large compression, the area between the many split pieces of wood is increased by the rolled wood and the bonding area is increased via the thermosetting adhesive. Since they can be bonded, a wood-based material having a low density and a high adhesive strength can be manufactured.

According to a fourth aspect of the present invention, there is provided a method for producing a woody material, wherein a rolled product of wood is formed into a corrugated plate and integrated with a split piece, so that a large number of split pieces of wood are rolled of a corrugated wood. Thus, it is possible to manufacture a wood-based material bonded in a state where the bonding area is increased via a thermosetting adhesive.

[0020]

Embodiments of the present invention will be described below. Example 1 A cedar lumber back plate (approximately 30 x 150 x 2000 mm) is passed between a pair of upper and lower rotary blades for small splitting to make wood into small split pieces. By passing between the rotary blades, many split pieces of wood having a cross section of 4 × 10 mm and a length of 2000 mm were obtained. The multiple pieces of wood split were aligned to form a single layer.

Another cedar lumber back plate is passed between five pairs of a pair of upper and lower rolling rolls having an outer diameter of 170 mm, a peak height of 10 mm, and a pitch of 10 mm to form a sheet-like sheet as shown in FIG. A rolled wood 2 was obtained. 5 parts by weight of an isocyanate-based adhesive was applied to one surface of each layer in which a number of split pieces of wood were aligned without being stacked. 20 parts by weight of an isocyanate-based adhesive was applied to both sides of a rolled sheet of wood. As shown in FIG. 3, the rolled sheet-like wood 2 is embedded in a corrugated sheet between the opposing split single layers 3 and 3 with the surface coated with the isocyanate-based adhesive facing inward. At 150 ℃, 10kgf
/ Cm ² for 30 minutes by thermocompression bonding to cure and integrate the isocyanate-based adhesive to obtain a wood-based material 4.

The obtained wood-based material 4 has a JAS mechanical grade of E90 (for example, a bending Young's modulus of 90,000 kg).
f / cm ² ), the pressure of the nailing machine was 4 kgf / cm ² , nailing was sufficiently performed, and the nail holding force (based on JIS Z 2121) was good.

Example 2 A molded product was obtained in the same manner as in Example 1 except that a rolled wood product was a corrugated plate. The resulting molded product is
It had the same physical properties as the molded article of Example 1, and the axial compressive strength was 1.5 times.

Comparative Example 1 A molded product was obtained in the same manner as in Example 1 except that a rolled wood product was not used. The resulting molded article is a JAS mechanical grade class E70 (for example, bending Young's modulus 70,000 k
gf / cm ² ), and the nail holding force (JIS Z)
2121) was only about 80% of the molded product of Example 1.

Comparative Example 2 A molding pressure of 20 kgf was used without using a rolled wood product.
A molded article was obtained in the same manner as in Example 1 except that the ratio was changed to / cm ² . This molded product maintained E90 level performance, but required a pressure of 8 kgf / cm ² or more for nailing.

[0026]

As described above, the woody material of the first aspect of the present invention is excellent in strength and can be easily nailed.

[0027] Since the woody material of the second aspect of the present invention is configured as described above, it is more excellent in strength and can be easily nailed.

The method for producing a woody material according to the third aspect of the present invention, which has the above-described structure, produces a woody material which is excellent in strength and can be easily nailed with a small loss of sawdust and the like with high material efficiency. be able to.

Since the method for producing a woody material according to the fourth aspect of the present invention is configured as described above, it is possible to produce a woody material having higher strength and being easily nailed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a rolling roll used for producing a rolled wood product used in the present invention.

FIG. 2 is a schematic perspective view showing an example of a rolled sheet-shaped wood used in the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of a wood-based material in which rolled wood pieces are combined in a corrugated shape in the present invention.

[Explanation of symbols]

 2 Rolled wood 3 Split single layer 4 Wood material

Claims (4)

[Claims] 1. A wood-based material, wherein a rolled product of wood is embedded between a number of split pieces of wood and integrally joined by a thermosetting adhesive. 2. The wood-based material according to claim 1, wherein the rolled wood is corrugated. 3. A rolled piece of wood is sandwiched between a large number of split pieces obtained by splitting wood through a thermosetting adhesive, and heated to cure the thermosetting adhesive to be integrated. A method for producing a wood-based material. 4. A method for producing a wood-based material according to claim 3, wherein the rolled wood is corrugated and integrated with a large number of split pieces of wood.