JPH04118203A - Manufacture of thick veneer decorative board material - Google Patents

Abstract

PURPOSE:To bond a thick veneer as it is left as it is a wet material, and to conduct commercialization by temporarily reducing and releasing welding pressure and deaerating air when the thick veneer dimension-stabilized and treated by the impregnation of a soft synthetic resin as the thick veneer is left as it is moistened. CONSTITUTION:The wet chips of wood are laminated and bonded in a collective shape to form an aggregate flitch, a parquet-pattern thick veneer being manufactured by cutting aggregate flitch in the direction that the laminated cross section is obtained and having thickness of 1.0mm and 35% moisture content is held for thirty min under decompression of 700Torr in a pressure vessel, and charged into a polyethylene glycol aqueous solution having molecular weight of 4000, decompression is returned to normal pressure, and the veneer is sustained for five hr at pressure of 5kg/cm<2>. The thick veneer is erected on an inclined base for draining, and held for forty hr, and moisture content is brought approximately thirty %. On the other hand, the surface of plywood in thickness of 12mm is coated with the mixed adhesives of modified rubber latex and a multifunctional epoxy group at the rate of 140g/m<2>, and the thick veneers after draining are superposed and laminated, set between the upper and lower hot plates of a pressing machine, and thermocompression-bonded under the conditions of pressing in another table, thus acquiring a parquet-pattern decorative board material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to thick veneer decorative boards used for flooring, wall materials, furniture materials, etc., that is, thick wood materials with a thickness of 0°5 or more The present invention relates to a method for manufacturing a decorative board material using a thick decorative veneer, in which the veneer is used as a decorative material and is adhered onto the surface of a substrate made of plywood or the like.

Conventional technologies and technical issues Traditionally, as a decorative board material used especially for flooring, etc., a parquet pattern (checkered pattern, random pattern, etc.) with a thickness of about 0.20 to 0.358 mm was applied to a substrate such as plywood. Those with thin wood veneer pasted are often used. The production of decorative board materials is
As shown in Japanese Patent Publication No. 52-6329, a plurality of wet boards or pieces of wood are laminated and bonded together using a moisture-curable adhesive, such as a polyurethane adhesive, and the resulting aggregated flitch is laminated. This is done by cutting thinly in the direction of obtaining a cross section to produce a decorative thin veneer with a marquetry pattern, and then attaching this to a substrate in a wet state.

On the other hand, in recent years, with the trend toward higher quality building materials, decorative board materials with an even better wood texture and even greater durability for use as flooring with shoes on have been developed with a thickness of 0. 5■
As mentioned above, there is a strong demand for a decorative board material using a wood veneer with a thickness of about 0.6 to 3.0 mm, preferably having a marquetry pattern.

However, it is difficult to industrially produce such a decorative board material using a thick veneer as a decorative material by the above-mentioned manufacturing method using a thin veneer.

In other words, when a thick veneer is hot-press bonded onto a substrate while still wet, it retains a large amount of water, so when the pressure is released after hot-press bonding, the adhesive layer becomes saturated with water vapor, causing partial damage. This results in adhesion defects called lifting or punctures.

For this reason, even when pasting an ordinary thick veneer cut from a wet material flitch, the thick veneer must be thoroughly dried in advance to a moisture content of about 4 to 10% before being attached to the substrate. It had to be affixed to the Therefore, not only does the drying process require a lot of time and energy, and even large-scale drying equipment, but there is a high risk that the thick veneer will crack or warp during drying, and it is not always possible to obtain a good decorative board material. I couldn't.

Furthermore, when a thick veneer with a parquet pattern produced by laminating and gluing wet lumber into a desired parquet pattern and sawing or slicing it according to the conventional method described above is used as a decorative material, it is necessary to dry it. As a result, shrinkage and deformation of the material causes significant warping, distortion, fraying, cracking, adhesion failure, etc., making it impossible to obtain the desired product.

For this reason, conventionally, decorative veneers with a marquetry pattern have been manufactured using the following method.

First, using a sawn board made from sufficiently dried wood, this is cut into a predetermined shape that will become one unit of the parquet pattern, or rotary veneer or half-round veneer made from wet wood is sufficiently dried. , Cut into the above predetermined shape and have a dry thickness of 3. Make many small wood pieces of about 0 mm. When using the direct attachment method, the wood pieces are directly arranged and attached to the substrate so as to form a predetermined pattern. In addition, when using the parkerato method, the wood pieces are arranged in advance in a predetermined pattern and fixed with adhesive tape, attached to a mount such as kraft paper or non-woven fabric, or connected with a net-like hot melt adhesive thread. In this way, a structured sheet with a marquetry pattern of a predetermined area is created, which is then attached to a substrate, and the tape or mount is removed by a method such as sanding.

However, when using any of the conventional methods mentioned above,
In addition to the drying process to create dry wood pieces, the process of arranging the wood pieces individually to form a predetermined pattern requires a great deal of time and effort.
Production efficiency was poor. In addition, in the parquet method, the parquet-patterned structured sheet has a low moisture content (usually 4% or less) because the end surfaces of the wood pieces are not bonded to each other, and this is combined with the fact that During the pasting process, the wood piece deforms by absorbing moisture in the atmosphere and in the adhesive. For this reason, Figure 5
As shown in an exaggerated manner, due to moisture absorption and deformation of the individual wood pieces (11) pasted on the mount (lO), irregular warping occurs in the parquet pattern structure sheet (12), or as shown in Fig. 6. As shown, a structured sheet (14) is made by connecting wood pieces (11) with hot melt thread (13) and adhesive tape.
), the wood piece (11) is likely to be dislodged, and in either case, it is difficult to adhere accurately to the substrate and maintain pattern accuracy. In addition, boards made of thick dried wood pieces adhered to substrates, such as those mentioned above, develop minute cracks on the surface due to repeated moisture absorption and release due to changes in temperature and humidity over a long period of time after installation. Furthermore, there are also disadvantages such as gaps being created between adjacent wood pieces that are not bonded to each other.

In view of the problems of the prior art as described above, this invention has been developed as a decorative material with a thickness of 0. To simplify the manufacturing process in the production of decorative laminates using wood veneers with a thickness of 5 mm or more, thereby improving production efficiency, especially for decorative laminates with a parquet pattern. Our goal is to produce products with excellent pattern accuracy with high efficiency,
And also, in the product, there is an adhesion defect in the thick veneer,
The main technical problem is to create a material that is even more durable and less likely to develop wrinkles or cracks on the surface over time, and can maintain its appearance well over a long period of time.

Means for Solving the Problems In order to solve the above-mentioned technical problems, the present invention firstly involves processing a thick veneer used as a decorative material while it is still wet and dimensional stabilizing it by impregnating it with a soft synthetic resin. and secondly, when bonding the stabilized thick veneer to a base material by heat-pressure bonding, a degassing process is performed to temporarily reduce or cancel the pressure applied during the bonding process. The two main elements of the solution are:

The basic principle of this invention is to use a wet veneer with a thickness of 0.5 cm or more as a decorative material, and to impregnate the thick veneer with a treatment agent whose main component is a soft synthetic resin. After the stabilization treatment, the thick veneer shall be heat-press bonded to the substrate via an adhesive, and the heat-press bonding process shall be performed under a predetermined depressurization or depressurization condition at least once during the process. The gist of the present invention is a method for manufacturing a thick veneer decorative board material, which is characterized by performing a degassing treatment that is maintained for a period of time.

In addition, in the case of manufacturing thick veneer decorative board material having a marquetry pattern by the above method, as the decorative thick veneer, wet wood pieces are laminated and bonded together to form an aggregate flitch, and this aggregate A thick veneer with a marquetry pattern manufactured by cutting the flitch in the direction that obtains the laminated cross section shall be used.

Furthermore, in any of the above cases, the degassing treatment performed during the thermopressure bonding process is preferably performed under a pressure of 3. It is desirable that this be carried out by holding the pressure under reduced pressure or depressurization of 0 kg/cnf or less for 5 seconds or more.

Detailed explanation of the solution The thick wood veneer used as a decorative material has a thickness of 0.5 strokes or more, and generally has a thickness of 0.5 strokes or more. A diameter of 6 to 30 mm is used. Set the thickness to 0. The reason for limiting the amount to 5 parts or more is that when using a thinner veneer, it is possible to use the conventional manufacturing method described above, that is, to attach the wet veneer as it is to the substrate without any problems, and the present invention This is because there is no particular practical benefit in adopting this method. Further, the moisture content of the thick veneer is not particularly limited, but a wet one is usually used as the thick veneer. The point is that veneers obtained from ordinary wet wood flitch by sawing, slicing, etc. can be used as is, without any special drying treatment. Such veneers usually have a moisture content of 20% or more, and have almost no harmful warping or distortion due to drying. In particular, when using a parquet-patterned thick veneer as described below as a decorative thick veneer, the preferred range of moisture content is generally about 20 to 35%, although it varies depending on the tree species. If it is less than 20%, the veneer may be deformed due to shrinkage, and it will be difficult to restore it to its original correct dimensions even if it is later subjected to dimensional stabilization treatment, which will be described later. However, when using a single ordinary veneer as described below, the moisture content of the starting material is not a particular problem.

As long as it does not have defects such as cracks due to drying, it may have a moisture content of less than 20%, and even dry materials with a moisture content of 15% or less can be used.

Decorative thick veneers range from wet material flitch made of a single material.
Although a single piece of conventional veneer obtained by rotary cutting, slicing, sawing, etc. may be used, the advantages of the present invention are most beneficially achieved when using a parquet-patterned thick veneer. . The parquet-patterned veneer can be manufactured according to the method described in the above-mentioned Japanese Patent Publication No. 52-6329. That is, as shown in Fig. 1, a plurality of wet wood boards (1) are assembled together using an adhesive that can bond the wet wood together, such as a moisture-curing polyurethane adhesive. Laminated and glued together to form a collective flitch (2
), and then this aggregated flitch is sliced or sawed in the direction in which the laminated cross section is obtained to a thickness of 0.
Manufactured into thick veneer (3) with an irregular pattern of 5 mm or more. Alternatively, as shown in FIG. 2, the aggregated flitch (2) may be cut into small blocks (
4), and then combine and bond multiple small blocks to form a checkered pattern to form a secondary aggregated flitch (
2') is then sliced or sawed in the same direction as above to obtain a laminated cross section to produce a thick veneer (5) having a checkered pattern of a predetermined thickness. Of course, it is also free to manufacture a thick veneer with a more complicated parquet pattern other than those mentioned above, and any of these can be easily done according to the above method.

Next, the moist decorative thick veneers (3) and (5) described above are subjected to a dimensional stabilization treatment in advance. This dimensional stabilization process
A thick veneer is impregnated with an aqueous solution containing a soft synthetic resin as a treatment agent. Specific examples of the soft synthetic resin used for this include polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyoxyethylene derivatives (e.g. polyoxyalkylene, alkyl ether, alkylphenyl ether, polyoxyalkylene fatty acid ester, etc.), carbonate ester, etc. (e.g., ethylene carbonate, propylene carbonate, polymers thereof, diphenyl carbonate, etc.)
etc., and these may be used alone or in combination of two or more. In addition, in the case of polyethylene glycol, the average molecular weight is 1,000 to 10,000, preferably 2,000 to 8
,000 is preferably used. Then, the treatment agent has a concentration of these resin components of 15 to 60%, preferably 20 to 60%.
An aqueous solution adjusted to about 50% is used. Further, as the treatment agent, a heat-reactive water-soluble urethane resin that crosslinks with the polyols mentioned above may be used in combination. For example, 10 to 40 parts by weight of a heat-reactive water-soluble urethane resin may be used in combination with 100 parts by weight of the polyol.

Furthermore, a dye (for example, an acid dye) and a dyeing aid (for example, a polyoxyethylene derivative) may be added to the treatment agent to dye the thick veneer at the same time as the stabilization treatment. Furthermore, the treatment agent may contain a chelating agent for preventing iron contamination, a surfactant for improving permeability, and the like.

The process of impregnating thick veneer with the above-mentioned dimensional stabilizing treatment agent involves coating,
Any known means such as immersion in a normal temperature bath or hot bath, pressurized injection, reduced pressure injection, reduced pressure pressurized injection, etc. can be used alone or in combination of two or more types. To give an example of a suitable impregnation treatment, for example, the inside of a pressure vessel containing a thick veneer is
After maintaining the reduced pressure of 00 to 730 torr for 30 to 120 minutes, the processing liquid with a liquid temperature of about 25 to 40°C is poured into the pressure vessel and injected under reduced pressure, followed by normal pressure or 3 to 730 torr.
An example of this is an operation in which the sample is held under a pressure of 1 kg rad for about 3 to 12 minutes.

Regardless of the impregnation treatment, the amount of resin component impregnated by the stabilization treatment is 10% in terms of solid content based on the weight of the thick veneer (weight as dry material with a moisture content of 4% or less).
or more, preferably 15 to 50%
It is desirable that If this is less than 10%, the desired sufficient dimensional stabilizing effect cannot be imparted to the thick veneer.

The thick veneer that has been subjected to the dimensional stabilization treatment as described above hardly causes any dimensional changes in the veneer itself even if it is subsequently dried or even if it repeatedly absorbs and desorbs moisture due to changes in temperature and humidity. That is, shrinkage and expansion are reduced, and as a result, the occurrence of warping and cracking is reduced.

Therefore, next, the thick veneers (3) and (5) are attached to the substrate (6), but as a preliminary step, if necessary, the thick veneers (3) and (5) are attached to the substrate (6).
) (5) shall be subjected to draining treatment to remove excess moisture adhering to it and further adjust the moisture content. This draining process can be carried out in the simplest manner by placing a thick veneer upright on a draining ramp and leaving it for a predetermined period of time. In this case, it is preferable to change the direction of the inclination of the thick veneer while it is left standing, since this makes it possible to equalize the moisture content of the entire thick veneer. In addition, the draining process can be carried out by any method such as passing the thick veneer one by one between squeeze rolls or heat rolls, passing it through a blower dryer, using a high frequency dryer, or using a high frequency vacuum dryer. can be employed in one or more combinations.

The substrate (6) is most commonly plywood, but is not limited to this, for example, medium density fiberboard, hard fiberboard, particle board, laminated veneer board, wafer board, orientated board. In addition to wooden plates such as strand board (OS B), metal plates such as steel plates and aluminum plates, synthetic resin plates or sheets such as vinyl chloride plates, and inorganic plates such as slate can also be used.

The thickness is generally arbitrarily selected within a range of about 5.0 to 15 mm in relation to the use of the decorative board material.

To attach the decorative thick veneer (3) (5) to the substrate (6), apply the adhesive (7) on the surface of the substrate (6) and attach the thick veneer (3) (5) to the substrate (6).
After correctly positioning and pasting 5), the adhesive is bonded using heat and pressure.

The adhesive used here is not particularly limited, and may include urea-based, urea-melamine cocondensation type, phenol-based, resorcinol-based, vinyl acetate-based, polyurethane-based, aqueous polymer isocyanate-based, synthetic rubber-based, and natural rubber-based. Any known adhesive can be selected and used, such as modified rubber latex, acid-curable modified vinyl acetate, epoxy, and epoxyphenol.

The heat-pressure operation for bonding is basically the fourth step.
As shown in figure (a), heating plates (8) (9) facing each other vertically
), sandwiching the laminated product of the substrate (6) and the thick veneer (5) between them, and applying heat to 80 to 160°C, preferably 90 to 130°C, from heating plates (8) and (9), and 3 to 15 kg/cd,
This is preferably carried out by applying a pressure of 4 to 10 kg 10f and holding it under this hot pressure for a predetermined time, but in the present invention, degassing treatment is interposed at least once during the hot pressure bonding process. This is an essential requirement.

This deaeration treatment is carried out under depressurization, in which the pressing force is released by separating the heating plate (9) from the surface of the thick veneer (5), or under depressurization, as shown in an example in Fig. 4 (b). 9).3. 0 kg/cm or less, particularly preferably 2. 0k
This is an operation in which the pressure is reduced to below g/cnf for a period of 5 seconds or more, particularly preferably 7 seconds or more but 2 minutes or less. Therefore, this treatment operation is performed in order to rapidly evaporate the moisture contained in the wet thick veneer (5) as it is being used as is. By doing this, it is possible to prevent adhesion failures such as lifting and punctures as described in the above-mentioned prior art. Therefore, air may be blown during this degassing process to help evaporate the moisture. In addition, processing conditions such as the number of degassing operations and holding time are set as appropriate depending on the thickness and moisture content of the thick veneer (5).
However, in general, the desired purpose can be sufficiently achieved by carrying out the degassing operation once to three times during the heat-pressing process. The pressure for degassing is 3. 0kg/a
If the holding time is d or more and the holding time is 5 seconds or less, the moisture from the thick veneer will not be sufficiently removed by evaporation, which will likely cause poor adhesion.

As is clear from the above, the 1st to nth heat-pressing steps performed before each degassing step are not intended for essential adhesion, but rather for wet thick veneer (5 ) to rapidly evaporate the moisture in the thick veneer during the next degassing process. And 1
The final heat-pressure treatment step, which is performed after one or more degassing treatments, is the one for the actual bonding. Therefore,
In the initial heat-pressing step, it is not necessary to apply a high pressure, and the pressure may be lower than the above-mentioned heat-pressing pressure.

Therefore, applying pressure during the thermopressure bonding process according to the present invention,
The generally preferred ranges of degassing conditions are as follows. Of course, these conditions are just a general example, and conditions may be set to deviate from the following range depending on the thickness of the thick veneer, moisture content, etc.

[In the case of one-time degassing] Primary pressurization 1-8 kg/alf x 15-120 seconds ↓ Degassing 0-2 kg/a (x 7-150 seconds final pressurization 3
~8kg/cd x 1-7 minutes [In case of double degassing] Primary pressurization 1-8kg/adX10-60 seconds Primary degassing
0~2kg/cnfX20~60 seconds secondary pressurization 1~8k
g/d×10~40 seconds Secondary degassing O~2kg/aIr×
20 to 60 seconds Final pressurization 3 to 8 kg/ci x 1 to 6 minutes The decorative board material, which has been integrated with the thick veneer (5) on the substrate (6), may be surface coated or coated as appropriate depending on the application. The product is made by performing necessary processing such as forming a joint on the periphery.

Examples (Examples 1 to 3) Thickness of oak wood 1. Using a parquet pattern thick veneer as shown in Figure 1 with a thickness of 0 mm and a moisture content of 35% as a decorative material,
After holding this in a pressure vessel under a reduced pressure of 700 torr for 30 minutes, a polyethylene glycol aqueous solution (concentration 35%, liquid temperature 30°C) with an average molecular weight of 4,000 was added, and after returning to normal pressure, 5 kg Dimensional stabilization treatment was carried out by applying pressure to /ci and holding for 5 hours.

Next, the thick veneer after this treatment was placed on a slope for draining (angle 35°) and held for 340 hours to remove water, so that the moisture content of the thick veneer was about 30%.

On the other hand, a 12-thick plywood board was used as the substrate, and a mixed adhesive of modified rubber latex and polyfunctional epoxy system was applied to the surface of the board at a rate of 140 g/m. The veneers were placed one on top of the other and bonded together.

Next, this bonded product was set between the upper and lower heating plates of a press machine, and with the temperature set at a constant 110°C, Nα1 to 3 (Examples 1 to 3) shown in Table 1 were applied. Heat-pressure bonding was performed under pressurized conditions to obtain a parquet-patterned decorative board material.

Table 1 In all of the decorative board materials of Examples 1 to 3, the thick veneer and the substrate were well bonded over the entire surface, and there were no adhesion defects such as lifting or punctures. In addition, the surface of the decorative thick veneer layer has a flat surface and is of excellent quality, with no defects such as warping or cracking in the constituent unit pieces of the marquetry pattern, and no gaps between the unit pieces. It was something like that.

(Examples 4 to 6) As a decorative material, it is made of oak wood and has a thickness of 2.5 mm.

A thick veneer with a parquet pattern as shown in FIG. 1 with a moisture content of 23% was used. Then, this was depressurized at 400 torr for 120 minutes using the same stabilizing agent as in Example 1,
A treatment solution was added, the pressure was returned to normal, and the pressure was left to stand for 180 minutes to perform an impregnation treatment (stabilization treatment).

Next, water was drained in the same manner as in Example 1 (however, the water content of the thick veneer after draining was 40%), and after superimposing it on the substrate via adhesive, Example 4
A thermopressure bonding process was performed under the process conditions of ~6).

[Margin below]

The thick veneer decorative board material thus obtained also had excellent quality characteristics, with no defects such as poor adhesion, warpage, or gaps, similar to that of Example 1.

(Comparative Example 1) Same as Example 1, a veneer with a parquet pattern with a thickness of 1.0 cm was used as a decorative material, and it was left as a wet material with a moisture content of 35% without undergoing dimensional stabilization treatment. , one-time heat-pressure operation (7k
g/cnfXa min. 30 sec. (no degassing) to bond to the substrate under heat and pressure. The substrate and adhesive were the same as in Example 1.

The decorative board material obtained by this method had partial lifting due to poor adhesion in the decorative thick veneer on the surface, and had many minute cracks on the surface, making it unsuitable for practical use. .

(Comparative Example 2) Same thickness as Example 4 2. A veneer with a parquet pattern thickness of 5 mm was used as a decorative material, and dimensional stabilization treatment was performed on it under the same conditions as in Example 4.

Thereafter, the decorative thick veneer was bonded to the substrate using heat pressure only once (7 kg/a (6 minutes - no degassing).Other conditions were the same as in Example 4. And so.

As a result, the obtained decorative board material was found to be partially lifted due to poor adhesion, as in Comparative Example 1 above. Almost no cracks were observed on the surface of the decorative thick veneer.

(Comparative Example 3) A veneer with a thickness of 1.0 m similar to Example 1 was used as a decorative material,
This was processed in a heat-pressure bonding process (pressure: 7 kg/
cnfX 20 seconds → Deaeration Okg/adX 30 seconds - Pressure 7
It was attached to the board using 2 minutes).

The decorative board material thus obtained had no lifting or punctures in the bonded state of the thick veneer, but had many fine cracks on the surface of the thick veneer.

[Comparison]

A cold and hot cyclic B test was conducted on each thick veneer decorative board material obtained in Examples 1 to 6 and Comparative Example 2 to examine its durability. In this test, one side is 150-
Create 6 square test pieces each and heat them at 80°C.
This was done by leaving the specimen in a constant temperature chamber for 2 hours, then in a constant temperature chamber at -20°C for 2 hours, repeating this procedure twice, then leaving it until it reached room temperature, and then checking the number of cracks on the surface of the test piece. .

The results are shown in Table 3 together with the presence or absence of surface defects after hot pressing.

[Margin below]

Table (Note*) No cracks or lifts Many fine cracks and lifts Lifts occur, no cracks No lifts, cracks Effects of the invention According to the invention, as mentioned above, wood with a thickness of 0°5 or more In the manufacture of a plate material using a veneer with a thickness of N1 as a surface decorative material, the veneer with a thickness of N1 can be bonded to a substrate without any problem and manufactured into a product while it is in the state of a wet material. This effect is due to the fact that by applying a predetermined dimensional stabilization treatment to the thick veneer in advance, the surface does not crack, warp, crack, etc. during the subsequent heat-pressure bonding process, and the heat-pressure bonding process This is achieved by inserting a degassing process in the middle of the process to provide a so-called breather, thereby preventing adhesion failures such as lifting and punctures, regardless of the use of wet thickness veneer.

Therefore, according to the present invention, it is possible to eliminate the need to dry the decorative thick veneer to a dry state in advance, and it is also possible to avoid the difficulty of adhering to the base material due to the warping and cracking of the material that occurs as a result of drying. This can improve the production efficiency of thick veneer decorative board materials.

In particular, when a parquet-patterned thick veneer is used as a decorative material as in claim (2), by not drying the thick veneer, warping, fraying, peeling, etc. can be prevented even during the process of pasting it onto the substrate. It does not cause any scratches, and even if it has a complicated parquet pattern, it can be attached to the board while accurately maintaining the shape of the pattern, and it also eliminates the troublesome mechanical process of wood pieces. A thick veneer decorative board material with a parquet pattern with excellent pattern accuracy can be produced with high efficiency.

Moreover, not only when using a regular single thick veneer, but also when using a parquet-patterned thick veneer as described above for decorative materials, the thick veneer mentioned above has been subjected to dimension stabilization treatment. Due to this, significant expansion and contraction does not occur repeatedly due to changes in temperature and humidity over time, and as a result, the surface is less likely to develop wrinkles, and the decorative material layer does not lift or warp. And for those made of thick veneer with parquet pattern,
Coupled with the fact that the pattern constituent unit pieces are bonded to each other or at the wood end surface, it is possible to prevent gaps from forming between the unit pieces over time, making it possible to obtain a decorative board material with even greater durability. can.

[Brief explanation of drawings]

1 to 4 show embodiments of this invention,
Figures 1 and 2 are both perspective views showing the manufacturing process of parquet-patterned thick veneer, Figure 3 is a perspective view showing the state in which the thick veneer is attached to the board, and Figure 4 (A) (Roll). ) is a sectional view of the pressurizing step and the degassing step during the thermopressure bonding step. FIGS. 5 and 6 are perspective views exaggerating the deformed state of the structured sheet after the process of assembling the wood pieces in the conventional manufacturing process. (3) (5) Thick veneer, (6) Board, (7)
··glue. Above Figure 3 Figure 4

Claims (2)

[Claims] (1) Use a thick veneer with a thickness of 0.5 mm or more as a decorative material, perform a stabilization treatment by impregnating the thick veneer with a treatment agent whose main component is a soft synthetic resin, and then remove the thick veneer. The substrate is bonded by heat and pressure using an adhesive, and the heat and pressure bonding step is performed at least once during the process by intervening a degassing treatment in which the substrate is held under reduced pressure or depressurization for a predetermined period of time. Features: A manufacturing method for thick veneer decorative board materials. (2) As a decorative thick veneer, wet wood pieces are laminated and glued together to form a set flitch, and this set flitch is cut in the direction to obtain the laminated cross section. The method for manufacturing a thick veneer decorative board material according to claim (1), using a veneer.