JPH08332603A - Laminated material - Google Patents

Abstract

PURPOSE: To increase dimensional stability by pushing and perforating at least one side of a veneer constituting laminated material in the direction of thickness and thereafter using an adhesive consisting of both resin of low molecular weight not larger than specific molecular weight and resin of high molecular weight not smaller than specific molecular weight, laminating and bonding the worked veneers. CONSTITUTION: Many recessed holes 5 are formed on the surface by passing a veneer 1 between a steel roll 2 provided with many projections 3 on the surface and a rubber roll 4. In this hole working, when an adhesive 6 is applied to the recessed holes 5 in depth unpenetrating the veneer 1, the recessed holes 5 are provided in depth of such a degree as the veneer 1 is impregnated with the adhesive 6 and it is injected into the veneer 1 through vessels of ligneous material appearing in the cutting faces of the recessed holes 5. Working is performed in such a way and the worked veneer is dried in accordance with necessity. Thereafter, laminated material is produced by applying and impregnating the adhesive by a means such as heating and clamping. In application of the adhesive, the adhesive obtained by mixing resin of high molecular weight of >=700 molecular weight with resin of low molecular weight <=400 molecular weight may be applied to the worked veneer. Further, the worked veneer is coated with the adhesive consisting of resin of low molecular weight, impregnated therewith and treated and thereafter the worked veneer may be laminated and bonded by the adhesive consisting of resin of high molecular weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood laminated material suitable for residential building materials, construction materials, exterior materials and the like, which is excellent in weather resistance, durability, water resistance, dimensional stability, strength and the like.

[0002]

2. Description of the Related Art Wood materials have been conventionally used as building materials for houses, but since they are natural products, the strength of wood of the same tree species may differ depending on the production area and subsequent processing conditions. Therefore, there are problems such as differences in strength and dimensional stability.
From these facts, there is a demand for a wood material which has a constant strength and dimensional stability irrespective of the species and material of the wood, and which has a strength higher than that of conventional wood. Conventionally, a method of impregnating and injecting resin into wood has been performed as a method of strengthening wood, but it is difficult to inject it evenly into the interior, and the equipment becomes large and costly. Therefore, it is rarely used as a general building material.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to meet the above-mentioned demands of the prior art. The processing method is simple, expensive equipment is not required, and the reinforcing resin is uniformly dispersed in the wood material. It is intended to provide a wood laminated material which can be impregnated and injected and has improved strength and the like, and a method for producing the same.

[0004]

The laminated material of the present invention is formed by punching a hole in the thickness direction on at least one surface of a veneer constituting the laminated material so as to cut the wood fiber of the veneer. It is characterized in that the single plate is laminated and adhered using an adhesive composed of a low molecular weight resin and a high molecular weight resin.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a method similar to embossing a plastic sheet or synthetic leather with a steel roll having a large number of protrusions at appropriate intervals on the surface for forming holes in a single plate. It can be performed by pressing. In addition to the rotating roll method,
It can also be carried out by pressing with a planographic plate provided with protrusions. However, roll processing is preferable in terms of equipment. The shape of the protrusions provided on the surface of the roll or the like is not particularly limited as long as it can cut the wood fibers of the single plate, and may be a pyramid, a truncated pyramid, a prism, a cone, or a truncated cone. Although narrow-width plate-shaped protrusions can be used, a pyramidal shape is particularly preferable. FIG. 1 shows an example of the punching device. In the figure, 1 is a veneer, and a large number of recessed holes 5 are formed on the surface of the veneer 1 by passing the veneer between a steel roll 2 for processing and a rubber roll 4 having a large number of projections 3 provided on the surface. Formed and the wood fibers cut. 2 and 3 are perspective views showing examples of the protrusions 3. FIG. 2A shows a pyramid-shaped protrusion 3a, FIG. 2B shows a truncated pyramid-shaped protrusion 3b, and FIG. Shows a narrow narrow plate-like projection 3c and a narrow narrow plate-like projection 3d (B) having a flat upper surface.

The hole is a concave hole formed by press-fitting the protrusion. As shown in FIG. 4, the hole is machined to a depth such that it does not penetrate the veneer 1, and when the adhesive 6 is applied, the cut surface of the hole 5 (inner side wall). ), It is advisable to provide it at a depth such that the adhesive 6, particularly low molecular weight resin liquid, is impregnated and injected into the veneer from the wood material conduit shown in FIG. The depth and width should be such that the wood fiber swells due to water in the agent and restores to the original veneer surface. Although it depends on the material of the wood material, more specifically, the thickness of the plate is 40 to 8
It is advisable to use a recessed hole having a depth of about 0%. However, the holes formed by the protrusions may be through holes reaching the back surface of the veneer as long as the strength of the veneer is not significantly reduced. For example, the tips of the pyramidal protrusions may reach the back surface of the veneer. The smaller the distance between the holes to be provided, the larger the injection amount of the adhesive agent, but it is preferable to provide the holes in a range that does not reduce the strength of the single plate.

As for the drilling process, as shown in FIG. 5, two upper and lower processing rolls 2 may be used to form holes 5 at the same positions on the front and back of the single plate 1. They may be provided alternately as shown in FIG. Although the thickness of the veneer is not particularly limited, it is preferably about 1 to 10 mm, which is usually used for laminated materials, and more preferably about 2 to 4 mm.
The processed veneer that has been perforated as described above is dried if necessary, and then an adhesive is applied by a method such as coating or impregnation, and a required number of laminated materials are formed by means such as heating or pressing. And Laminates can be manufactured as either veneer laminate (LVL) or plywood.

The application of the adhesive agent to the above-mentioned punched veneer may be carried out by applying an adhesive agent obtained by mixing a low molecular weight resin and a high molecular weight resin to the processed veneer. May be applied and impregnated with a low molecular weight resin adhesive, and then laminated and adhered with a high molecular weight resin adhesive. Furthermore, the processed single plate treated with the low molecular weight resin adhesive may be laminated and adhered with an adhesive composed of a low molecular weight resin and a high molecular weight resin to form a laminated material. As the adhesive composed of a low molecular weight resin and a high molecular weight resin in the present invention, an adhesive composed of a low molecular weight phenol resin and a high molecular weight phenol resin can be preferably used. As a low molecular weight phenolic resin,
From the viewpoint of permeation into wood fibers, those having a molecular weight of 400 or less are preferable. A material having a molecular weight of 400 or less and capable of being hardened to give strength to a veneer is used. The high molecular weight phenol resin is not particularly limited as long as it can be used as an adhesive when laminating a single plate, but a phenol resin having a molecular weight of 700 or more is particularly preferable. When the molecular weight is 700 or less, the resin may not be sufficiently impregnated into the wood fiber when mixed with the low molecular weight phenol resin.

In the present invention, if necessary, a colorant such as a dye may be mixed in a low molecular weight resin and injected together with the resin to color the veneer into a predetermined color. Further, a high molecular weight resin adhesive For example, high molecular weight phenolic resin adhesives, preservatives, fungicides, insect repellents, fireproofing agents, dimensional stabilization agents, etc.
It is also possible to obtain a laminated material having these characteristics by incorporating one or more kinds of treatment agents.

The ratio of low molecular weight resin to high molecular weight resin is
Although it depends on the strength of the intended laminated material and the resin used, in the case of the phenol resin adhesive, the low molecular weight phenol resin adhesive is 5 to 50% (weight ratio), preferably 10 to 20 with respect to the total amount of the adhesive. It is blended in the range of%. If the amount of the low molecular weight phenolic resin adhesive is 5% or less, the amount of resin impregnated into the veneer may be insufficient and the strength of the veneer may be reduced due to punching. If it is 50% or more, the properties of the low molecular weight phenolic resin adhesive may be low. It may come out strongly and the lamination strength may decrease.

As the adhesive which can be used in the present invention, those used for adhering wood can be used. For example, in addition to phenol resin, melamine resin, acrylic resin, epoxy resin, alkyd resin, etc. are exemplified. It is possible to use not only the same kind but also a mixture thereof. In the present invention, as preservatives, fungicides, insect repellents, fireproofing agents, dimension stabilizing treatment agents and the like to be added to the adhesive, those generally used for treating wood can be used. For example, as a preservative, Sampras (3-bromo-2,3-diiodide-2-propenylethyl carbonate), IF-1000, S-421, xylazane AL, etc., as a fungicide, IF-1000, xylazane AL, Troysan, etc., insect repellents such as hoxime, fenitrothion, dichlorophenphos, chlorpyrifos, etc., fire retardants such as boron flame retardants, phosphorus nitrogen flame retardants, etc., and thermosetting polyethylene glycol (PEG) resin, low molecular weight stabilizers. Examples thereof include phenol resins, but the invention is not limited thereto.

In the present invention, the antiseptic or antifungal agent is one selected from the group consisting of nitrile antibacterial agents, pyridine antibacterial agents, haloalkylthio antibacterial agents, organic iodine antibacterial agents and thiazole antibacterial agents or The use of antibacterial compositions containing two or more antibacterial agents as active ingredients is preferred. The antibacterial composition is characterized by further containing a benzimidazole antibacterial agent, if desired.

Specifically, in the antibacterial composition, the nitrile antibacterial agent is a haloisophthalonitrile compound, the pyridine antibacterial agent is a sulfonylhalopyridine compound and / or a pyridinethiol-1-oxide compound, and a haloalkylthio type compound. The antibacterial agent is a haloalkylthiosulfimide compound, the organic iodine antibacterial agent is an iodosulfonylbenzene compound, the thiazole antibacterial agent is an isothiazolin-3-one compound, and the benzimidazole antibacterial agent is a benzimidazolecarbamic acid compound and / or The composition is selected from thiazolylbenchimidazole compounds. In the antibacterial composition, each antibacterial agent is selected and used in various proportions according to the purpose, and diluted with an appropriate solvent such as water or hydroalcoholic solution, or added or blended as it is to an adhesive or the like. It

More specifically, as the constituent antibacterial agent of the antibacterial composition, as a nitrile antibacterial agent, 2, 4, 5, 6
-Tetrachloroisophthalonitrile as a pyridine antibacterial agent, 2-pyridinethiol-1-oxide sodium and 2,3,5,6-tetrachloro-4-methylsulfonyl pyridine as a haloalkylthio antibacterial agent N, N-dimethyl-N'-phenyl-N '-(florodichloromethylthio), sulfimide and N-florodichloromethylthiophthalimide are used as organic iodo-based antibacterial agents and include joodomethyl-p-tolylsulfone and 3
-Ethoxycarbonyloxy-1-bromo-1,2-jodo-1-propene as a thiazole antibacterial agent,
2- (n-octyl) -4-isothiazolin-3-one is used as 2- (4-
Thiazolyl) -1H-benzimidazole and 1H-2
Mention may be made of methyl benzimidazole carbamate.

In the structure of wood, a conduit through which moisture and nutrients pass from the root of the wood toward the tip runs parallel to the wood fiber.
In the present invention, by cutting a wood fiber by making a concave hole in a veneer, the cut surface of these conduits or the like appears on the side wall of the concave hole, and a low molecular weight resin liquid between these conduits and wood fibers causes capillary phenomenon. It is considered that the laminated material having the improved strength is obtained by uniformly permeating the single plate with the resin because it permeates through and hardens inside.

[0016]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited thereto.

Example 1 A veneer lace-made veneer lace was used to obtain a veneer veneer having a thickness of 4 mm and a width of 1200 mm from a log of raw radiator pine, and the veneer 3 was provided with a projection 3 for perforating the surface as shown in FIG. 1 before drying. A single plate 1 is passed between a steel roll 2 and a rubber roll 4 provided with a large number of
A large number of concave holes 5 were opened on one surface of the above to perform fiber cutting. The hole 5 was a pyramid-shaped concave hole having a width of 7 mm, a length of 3 mm and a depth of 3.4 mm, which was formed in a puddle shape on the entire surface of the single plate 1. The veneer was dried with a dryer at 180 ° C. for 8 minutes to finish the water content to 5%.
After that, this single plate was cut into a predetermined size and joined in the width direction and the length direction. The lengthwise joint was cut to form a scarf joint. Next, 100 parts of a phenol resin adhesive PL-S (manufactured by Honen Corporation: resin content 62%) as a high molecular weight resin and 15 parts of a low molecular weight phenol resin (average molecular weight 260: manufactured by Dainippon Ink) as a low molecular weight resin are mixed. The resulting phenol resin adhesive was applied with a coating machine (spreader) at a rate of 20 g / one side. The scarf joint cut veneer coated with adhesive has a scarf joint part in the vertical stacking direction of 15
It was set up so that it was separated by 0 mm. This was temporarily pressed with a cold press, and then thermocompression integrated at 120 ° C. for 10 kg / cm ^{2 for} 25 minutes to obtain a 9-ply laminated sheet material (LVL).

Test Example The bending strength and the like of the LVL (product of the present invention) obtained in Example 1 were measured. As a control, the laminated material (conventional product) obtained by adhering the unpierced veneer obtained in the example with the phenol resin adhesive PL-S and the perforated veneer obtained in the example were subjected to the phenol resin adhesive. A laminated material (comparative product) bonded by PL-S was used. Five samples were measured for each sample, and those having a large difference in numerical value were excluded to obtain an average value. The results are shown in Table 1.

[0019] As can be seen from the results in Table 1, the bending strength of the product of the present invention is about 30% stronger than that of the conventional product, and the bending Young's is also improved by 20%. On the other hand, the comparative product shows almost the same strength as the conventional product.

Example 2 Using a machined veneer punched in the same manner as in Example 1,
To this processed veneer, the high molecular weight and low molecular weight phenolic resin adhesive used in Example 1 and the antifungal agent KB (manufactured by Senkawa Co., Ltd .: mixed antibacterial agent) were added and mixed in a weight ratio of 3% to apply. A machine (spreader) was applied at a rate of 20 g / one side, and in the same manner as in Example 1 below, a 9-ply veneer laminate (LVL) was obtained. The obtained laminated material exhibits excellent antifungal properties because the antifungal agent is contained in the entire laminated material.
In addition, the antifungal property showed a better result than the laminated material similarly treated with the antifungal agent by using the high molecular weight phenol resin adhesive instead of the above adhesive agent.

The antifungal agent KB (mixed antibacterial composition) is 2, 4, 5, 6-, respectively, in a weight ratio with respect to the total amount of the composition.
Tetrachloroisophthalonitrile (Nitrile antibacterial agent)
20%, 2,3,5,6-tetrachloro-4-methylsulfonylpyridine (pyridine antibacterial agent) 17%, N,
N-dimethyl-N'-phenyl-N '-(florodichloromethylthio) sulfimide (haloalkylthio antibacterial agent) 9%, diiodomethyl-p-trisulphone (organic iodine antibacterial agent) 40%, and 2- (n- Octyl)-
4-isothiazolin-3-one (thiazole antibacterial agent)
An antibacterial composition containing 14% was used.

[0022]

INDUSTRIAL APPLICABILITY According to the present invention, since laminated single plates impregnated with resin are laminated, it is possible to obtain a laminated material which is almost uniformly reinforced. Depending on the adhesive used, water resistance, weather resistance and durability can be improved. A laminate can be made. Further, according to the present invention, a wood material having these properties can be obtained by mixing and using a treating agent such as an antiseptic agent, an antifungal agent, an insect repellent agent, a fire retardant agent and a dimension stabilizing treatment agent in the adhesive. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a single-plate punching device.

FIG. 2 is a perspective view showing an example of the shape of a projection for punching.

FIG. 3 is a perspective view showing another example of the shape of a projection for making a hole.

FIG. 4 is a cross-sectional view showing a state in which an adhesive is applied to a punched veneer.

FIG. 5 is a cross-sectional view showing another example of the boring process.

FIG. 6 is a cross-sectional view showing another example of a state in which an adhesive is applied to a punched veneer.

[Explanation of symbols]

 1 Veneer 2 Steel roll for processing 3 Protrusion 4 Rubber roll 5 Recessed hole 6 Adhesive

Claims (15)

[Claims] 1. A hole is formed in at least one surface of a veneer constituting a laminated material in a thickness direction so as to cut wood fibers of the veneer, and then the processed veneer is treated with a low molecular weight resin and a high molecular weight resin. A laminated material characterized by being laminated and adhered using an adhesive consisting of. 2. The laminated material according to claim 1, wherein the low molecular weight resin has such a molecular weight that the wood fibers can be impregnated with the low molecular weight resin. 3. The laminated material according to claim 1, wherein the processed veneer is coated and impregnated with a low molecular weight resin adhesive and then laminated and adhered with a high molecular weight resin adhesive. 4. The laminated material according to claim 1, wherein the processed veneer is coated and impregnated with a low molecular weight resin adhesive and then laminated and adhered with an adhesive composed of a low molecular weight resin and a high molecular weight resin. . 5. The laminated material according to claim 1, wherein an adhesive composed of a low molecular weight resin and a high molecular weight resin is applied to the processed veneer for lamination and adhesion. 6. The laminated material according to claim 1, wherein the adhesive composed of a low molecular weight resin and a high molecular weight resin comprises a low molecular weight phenol resin and a high molecular weight phenol resin. 7. The low molecular weight phenolic resin has a molecular weight of 4
The laminated material according to claim 6, wherein the laminated material is a phenol resin of 00 or less. 8. The high molecular weight phenolic resin has a molecular weight of 7
The laminated material according to claim 6, wherein the laminated material is a phenol resin of 00 or more. 9. A high-molecular-weight phenolic resin adhesive, a preservative, an antifungal agent, an insect repellent, a fireproofing agent, a dimension stabilizing agent, etc.
7. The laminated material according to claim 6, wherein one kind or two or more kinds of treatment agents are contained. 10. A preservative or antifungal agent is a nitrile antibacterial agent, a pyridine antibacterial agent, a haloalkylthio antibacterial agent,
An antibacterial composition containing, as an active ingredient, one or more selected from the group consisting of organic iodine-based antibacterial agents and thiazole-based antibacterial agents, and optionally a benzimidazole-based antibacterial agent. The laminated material according to claim 9. 11. The antibacterial composition, wherein the nitrile antibacterial agent is a haloisophthalonitrile compound, the pyridine antibacterial agent is a sulfonylhalopyridine compound and / or a pyridinethiol-1-oxide compound, and the haloalkylthio antibacterial agent is a haloalkylthio antibacterial agent. Alkylthiosulfimide compounds, organic iodine antibacterial agents from iodosulfonylbenzene compounds, thiazole antibacterial agents from isothiazolin-3-one compounds, benzimidazole antibacterial agents from benzimidazolecarbamic acid compounds and / or thiazolylbench The laminated material according to claim 10, which is a composition selected from imidazole compounds. 12. A laminated veneer is formed with a low molecular weight resin and a high molecular weight resin after punching a hole in the thickness direction so as to cut wood fibers of the veneer on at least one surface of the veneer. A method for producing a laminated material, which comprises laminating and adhering the same using an adhesive consisting of. 13. The method for producing a laminated material according to claim 10, wherein an adhesive composed of a low molecular weight resin and a high molecular weight resin is applied to the processed veneer for laminating and adhering. 14. The processed veneer is coated and impregnated with a low molecular weight resin adhesive, and then a high molecular weight resin adhesive or an adhesive composed of a low molecular weight resin and a high molecular weight resin is applied and laminated and adhered. The method for manufacturing a laminated material according to claim 10. 15. A veneer that constitutes a laminated material is formed with a hole in the thickness direction so as to cut wood fibers of a veneer on at least one surface of the veneer, and then a low molecular weight phenolic resin adhesive is applied to the processed veneer. A veneer for laminated materials, characterized by being impregnated.