JPH054202A - Veneer laminated material, decorative material using the same and manufacture thereof - Google Patents

Abstract

PURPOSE:To efficiently mass-produce a veneer laminated material of good quality used in a building or furniture by using preliminarily smoothed veneer. CONSTITUTION:Veneer preliminarily shaven and smoothed by a rotary race is cut into predetermined length and the cut ends of the cut veneers in the fiber direction thereof are symmetrically obliquely cut to be bonded each other along the fiber direction to form long veneer. The obtained long veneer is cut into predetermined length to form laminated plate materials 2 having joints (a) and a plurality of the laminated plate materials 2 are laminated and bonded so that the fiber directions thereof become parallel to form a laminated core material 3 and this core material 3 is directly used as a veneer laminated material 1 or veneer 4 having no joint is laminated and bonded to the core material 3 to form the veneer laminated material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneer laminate used for many purposes such as construction, furniture, vehicles / ships, packaging boxes, etc., and a decorative material using the veneer laminate and its manufacture. It is about the method.

[0002]

2. Description of the Related Art A single plate (Venn having a thickness of about 2 to 3 mm cut by a rotary race or a slicer)
er) are laminated and bonded mainly in parallel with each other in the fiber direction, and laminated and laminated.
veneer laminates are called structural materials and construction materials for wooden houses, doors and door frames, and casings, door-stops, furniture surface materials, frame materials, leg members, and ceilings. Used as daily necessities such as surrounding edge materials, floor skirting boards, cupboard pedestals, surface materials, doors, counter tables, and other hardwood structural materials that also serve as decorative materials.

[0003] Such a veneer laminated material (hereinafter simply referred to as LVL) is, for example, a broad-leaved tree such as rawan or apiton or beech, or a log material of conifer such as rice hemlock, rice pine, hiba, or cedar, to an appropriate size. After cutting into pieces, a rotary race is used to cut the pieces to a thickness of about 2 to 3 mm to produce veneers of a predetermined length, and the obtained veneers are dried with a dryer. The directions are parallel to each other and are laminated with an adhesive to form a laminated material, and the laminated material thus obtained is subjected to cold pressing and temporary pressing, and then hot pressing to heat pressing or simply continuous pressing. The entire laminated material obtained by press working is smoothed, cut into a predetermined width, and sanded only on the surface portion to obtain LVL.

[0004]

Such a known LVL manufacturing method is such that a rotary veneer obtained by rotary lace or a sliced veneer obtained by a slicer is entirely wavy. It is not smooth. Therefore, it is difficult to obtain a smooth veneer even if the veneer obtained by the known method is dried with a dryer while applying pressure, and such a wavy veneer is laminated using an adhesive. However, the adhesion between the veneers is not good. Further, it is extremely difficult to obtain a laminated material which is entirely smooth even if the laminated material laminated with an adhesive is subjected to cold pressing and hot pressing, or simply subjected to continuous pressing.

In view of such a current situation, the present invention enables efficient and mass production of good quality single plate laminated materials,
Moreover, it is an object of the present invention to provide an excellent decorative material by subjecting the obtained single plate laminated material to simple processing.

[0006]

The veneer laminated material of the present invention is a veneer having a predetermined length which is obtained by symmetrically cutting both ends of the veneer at both ends in the fiber direction and having a smooth surface. In the same direction, the small edges are adhered to each other to form a long veneer, and the obtained long veneer is cut into a predetermined length in the fiber direction to form a laminated plate material having seams, and these laminated plates The present invention is characterized in that a seamless single veneer having an entirely smooth surface is adhered to and integrated with a surface of a laminated core material obtained by laminating and bonding a plurality of raw materials with their fiber directions parallel.

Further, in the decorative material of the present invention, the veneers at the both ends in the fiber direction are symmetrically cut obliquely, and veneers of a predetermined length having a smooth overall surface are formed in the same fiber direction. The edges are bonded together to form a long veneer, and the obtained long veneer is cut into a predetermined length in the fiber direction to form a laminated board material having seams. The single-ply laminated material obtained by adhering and integrating a seamless single veneer with a smooth surface to the surface of the laminated cored material obtained by laminating and adhering them in parallel to each other was formed into a desired shape. It is a feature.

The method for producing a laminated veneer material is as follows: (1) A thin veneer obtained by cutting with a rotary race or a slicer is cut into a predetermined length, and then hot press and cold press are alternately performed. Applying and smoothing the whole veneer. (2) A step of symmetrically and diagonally cutting the edge of both ends of the smoothed veneer in the fiber direction to form an inclined cut surface on the edge. (3) A step of forming a long veneer by bonding a plurality of veneers in which inclined cut surfaces are symmetrically formed at the edges of both ends and making the fiber directions the same, and corresponding inclined cut surfaces are bonded to each other. (4) A long veneer is cut into a predetermined length in the fiber direction, and a plurality of the obtained laminated board materials having the seams are laminated and adhered while the fiber directions of the laminated board materials are the same, and the laminated board on the surface. The process of polymerizing and bonding a thin single plate that is seamless to the material. It is characterized by consisting of.

Another method of manufacturing the laminated veneer material is as follows: (a) When manufacturing a thin rotary veneer by cutting a log material with a rotary lace, the surface portion of the log material to be cut with a knife The process of cutting while pressing with a pressure bar. (B) After cutting the obtained rotary veneer into a predetermined length,
This is a process in which hot pressing and cold pressing are performed alternately to smooth the entire rotary veneer. (C) A step of symmetrically obliquely cutting the edges of both ends of the smoothed rotary veneer in the fiber direction to form an inclined cut surface on the edges. (D) A step of forming a long veneer by bonding a plurality of rotary veneers having inclined cut surfaces symmetrically formed at the edges of both ends with the same fiber direction and corresponding inclined cut faces bonded to each other. (E) A long veneer is cut into a predetermined length in the fiber direction, and a plurality of the obtained laminated plate materials having seams are laminated and adhered with the fiber directions of the laminated plate materials being the same, and the laminated plate on the surface. The process of polymerizing and bonding a thin single plate that is seamless to the material. It is characterized by consisting of.

Further, another method for producing a laminated veneer material of the present invention is as follows: (a) A thin veneer obtained by cutting with a rotary race or a slicer is cut into a predetermined length and then hot pressed. And cold pressing alternately to smooth the whole veneer. (B) A step of symmetrically cutting the edges of both ends of the smoothed veneer in the fiber direction to form an inclined cut surface on the edges. (C) A step of forming a long veneer by bonding a plurality of veneers having symmetrically cut inclined surfaces at the edges of both ends and adhering the corresponding inclined cut surfaces to each other in the same fiber direction. (D) A step of cutting a long veneer into a predetermined length in the fiber direction, and laminating and bonding a plurality of obtained laminated plate materials having the same fiber direction in each laminated plate material. It is characterized by consisting of.

In the veneer laminated material of the present invention, the veneer itself is not particularly limited in material and thickness as long as it is thin and cut by a rotary racer or a slicer. 3mm is preferable,
Generally, the width is preferably about 600 to 1200 mm from the viewpoint of workability, but may be a length corresponding to the plane area of the veneer laminated material or decorative material to be obtained.

[0012] The above-mentioned veneer is dried to the extent that it does not lose its flexibility during production to remove water, but generally the whole is wavy and not smooth. Therefore,
The obtained veneer is alternately subjected to hot pressing and cold pressing so that the whole is smooth. By such a work, a dense veneer with no irregularities on the front and back surfaces of the veneer can be obtained.

The thus obtained whole veneer having a smooth surface is obtained by obliquely cutting the edges at both ends in the fiber direction to form inclined cut surfaces, and adhering the corresponding inclined cut surfaces of the plurality of veneers. Thus, a long veneer having the same fiber direction as a whole is formed. The obtained long veneer is cut into a predetermined length in the fiber direction to form a laminated plate material having a seam, and a plurality of the laminated plate materials are laminated and bonded with the fiber directions parallel to each other to form a laminated core material.

It is desirable that the laminated core material is composed of a single plate having no knots or cracks as much as possible. However, knots and cracks are not formed in a range in which the quality and strength of the laminated core material are not inconvenienced. A veneer having can also be used. All such laminated core materials have a seam, and a single plate having seamless seams is laminated and bonded to the surface of the laminated core material to form a single plate laminated material.
The veneer to be laminated and adhered to the surface of the laminated core material is not particularly limited in its material and thickness as long as it is seamless, and therefore, it is the same or different veneer as the laminated plate material constituting the laminated core material. The laminated core material may have the same thickness as the laminated core material, or may be a single plate having a thickness of about 0.5 mm.

In the present invention, the seamless veneer includes not only a physically seamless veneer but also veneers connected so that the seam is inconspicuous. In addition, in the method for manufacturing each veneer laminated material, the constitution of the laminated core material is a state in which a plurality of laminated plate materials obtained by cutting a long veneer having a seam into a predetermined length have their fiber directions parallel to each other. Are laminated and adhered as a laminated core material, but a plurality of single plates having long seams are laminated and adhered in a state where the fiber directions are parallel, and then cut into a predetermined length in the fiber direction and laminated. It can also be used as a core material.

In the present invention, the veneer laminate does not necessarily need to have the seamless veneer laminated and adhered to the surface of the laminated core material, and the veneer laminate obtained without the seamless veneer laminated and adhered. Since the seam is exposed on the surface layer, it can be effectively used as a core material for various structural materials.

[0017]

In the laminated veneer material of the present invention, a plurality of veneers that are smooth as a whole and have inclined surfaces cut at both ends in the fiber direction symmetrically and obliquely are bonded to each other. To form a long veneer and cut it to a predetermined length in the fiber direction to obtain a laminated core material by laminating and laminating a plurality of laminated plate materials. A desired laminated veneer material can be obtained by changing the type of the laminated veneer.

Since the decorative material of the present invention can be obtained by cutting the above-mentioned laminated veneer material, the desired material can be obtained by simply changing the type of veneer on the surface of the laminated core material and the cutting method. It can be a decorative material.

The method for producing a laminated veneer material is as follows: hot press and cold press are alternately applied to a thin veneer of a predetermined length obtained by cutting with a rotary race or a slicer, before the veneer itself is used. Since it is smoothed to
It is possible to easily process the inclined cut surfaces of the veneer at both ends of the veneer, and to easily and easily connect the corresponding inclined cut surfaces of the plurality of veneers with an adhesive.

In another method for producing a laminated veneer material, when a veneer is cut by a rotary race to obtain a veneer, a surface of the log material to be cut with a knife is pressed by a pressure cover. By carrying out the method, it is possible to manufacture a dense veneer with few cracks.

Further, in the veneer laminated material obtained by another method for producing a veneer laminated material, a seam appears in the surface layer portion, but since it has excellent mechanical strength, it is used as a core material for various structural materials. Can be effectively used as.

[0022]

Embodiments of the veneer laminate, the decorative material using the veneer laminate and the manufacturing method thereof according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the veneer laminated material of the present invention. The veneer laminated material 1 comprises a plurality of laminated material 2 having a predetermined length and having a smooth surface as a whole. A seamless single plate 4 is laminated and adhered to the surface of the laminated core material 3 which is laminated and adhered.

As shown in FIG. 3, the laminated plate material 2 has a predetermined length obtained by cutting with a rotary lace or a slicer, for example, 600 mm in width and 2 mm in thickness. The edge is cut symmetrically at an angle of about 45 ° to form an inclined cutting surface 5a, and the single plates 5 and 5 to be connected are positioned in front and rear with the same fiber direction, and corresponding inclined cutting surfaces 5a, 5a. Adhesive is applied to, the seams a are pressed and adhered to each other, and the long single plate 6 is bonded.
The obtained long veneer 6 is cut to a predetermined length L in the fiber direction as shown in FIG.

Since the veneer 5 of a predetermined length obtained by cutting with the rotary race or slicer usually contains more water than necessary, it is used with a roll dryer (not shown) or the like. However, the veneer 5 that has undergone the drying step has a wavy roughness as a whole as shown in FIG. Therefore, in order to eliminate the undulation and smooth the whole, the single plate 5 to be used is alternately passed through a hot press and a cold press to form a dense single plate without unevenness on the front and back surfaces.

The veneer 4 laminated and bonded to the surface of the laminated core material 3 may be of the same quality as the veneer 5 as long as it is a seamless veneer, or has a thickness of about 0.5 mm. It may be a sheet-shaped or strip-shaped single plate formed by adhering a nonwoven fabric to the back surface of the veneer plate.

FIG. 6 shows a decorative material 7 formed by cutting the above-mentioned veneer laminated material 1 into a casing material such as a door frame material. Paint accordingly. The area to be coated is simply the single plate 4 as described above.
6 may be the surface only, or the range of the arrow shown in FIG. 6, that is, the entire portion appearing on the surface.

A method for manufacturing the single plate laminated material 1 having such a structure using a rotary single plate will be described below.

In FIG. 7, 10 indicates a length of 1200 mm to
It is a rice log made of deciduous trees cut into pieces of about 3000 mm. The log material 10 is rotatably supported by the chuck 11 at the center of both end surfaces of the cutting, and a driving roll 13 for rotating the log material 10 by slightly encircling a large number of circumferentially disposed blades 12 on the outer circumference of the log material 10 is provided. , Rotary lace blade 14
The log material 10 is set so as to be peeled off to a thickness of 2 to 3 mm, and the front of the edge of the rotary lace blade 14 is pressed from the surface of the veneer log material 10 with a pressure bar 15 to form a dense rotary single material. The plate 16 is manufactured.

At this time, the back surface of the log material 10 is always in contact with the back-up roll 17 which does not rotate.
The backup roll 17 allows the pressure bar 15 to always have a set pressure even when the log material 10 is cut by the rotary race blade 14 and the diameter thereof is gradually reduced, and is cut by the rotary race blade 14. This is for ensuring that the veneer 16 always has a constant thickness.

In the examples, rice wood made of deciduous tree, which is easy to obtain and excellent in economic efficiency, is used, but the material is not limited to rice wood.

The rotary veneer 16 obtained by cutting the rotary lace blade has a length of 600 mm to 1200 mm in the direction perpendicular to the feeding direction as shown in FIG. 8, or using the veneer laminate 1 of the present invention. A cut 18 is cut into a length corresponding to the plane area of the decorative material to be obtained to manufacture a dense single plate 5.

The thus obtained veneer 5 is passed through a line of a roll dryer or the like (not shown) in order to remove the water content until it does not lose its flexibility, and immediately before the veneer 5 is passed through the drier or the like. Immediately after that, sort the veneer with unusable joints or large cracks outside the line and sort.

The veneer 5 passed through the roll dryer has a relatively thin plate thickness of about 2 to 3 mm, and a large amount of water is removed by drying. As a result, the veneer is exaggerated in FIG. As shown, there is a wavy roughness in the vertical and horizontal directions. If the veneered rough veneer 5 is used as it is, it causes a bonding failure in the bonding step described later and the work efficiency is extremely deteriorated. Therefore, it is necessary to smooth the veneer 5 beforehand. is there.

Therefore, pressure is applied to a cold press device 21 and a hot press device 20 in which a plurality of the single plates 5 that have undergone the drying process are laminated as shown in FIG. In this state, the hot press device 20 heats the veneer 5 to make it flexible, and the veneer after the heating process is rapidly cooled by the cold press device 21 to remove the roughness, and the veneer without unevenness on both front and back surfaces. Process to 5.

In the hot pressing process, the temperature is about 140 ° C., the pressing pressure is about 1 Kg / cm ² , and the temperature is about 40.
It is heated for about 60 seconds to soften the lignin contained in the veneer to treat the veneer as a whole.

In this embodiment, a plurality of single plates 5 are superposed and passed through the hot press device 20 and the cold press device 21, but the plurality of single plates 5 are planarly stacked without being laminated. You may arrange and process.

The veneer 5 that has been smoothed as a whole through the hot pressing process and the cold pressing process is cut diagonally symmetrically in the thickness direction at the edges of both ends in the fiber direction to form an inclined cut surface 5a. (FIG. 2), and thereafter, an adhesive is applied to the downward inclined cut surface 5a of one veneer 5 and the upward inclined cut surface 5a of the other veneer 5, and this is polymerized and pressed to bond. Then, a long veneer 6 is manufactured. At that time, the fiber directions of the single plates 5 are the same and are integrally connected. Next, a long veneer 6 in which a plurality of veneers 5 are connected in the same fiber direction is cut into a fixed length L in the fiber direction as shown in FIG. 3, and a laminated plate having a seam a. Material 2 is used.

The laminated plate material 2 thus obtained has a seam a at least in part, and an adhesive such as urea is applied to the front and back surfaces of the laminated plate material 2 having the seam a. After that, these are laminated in a state where the fiber directions are parallel to each other and pressed to be integrated to form a laminated core material 3. In manufacturing the laminated core material 3, a single plate having relatively small knots and light cracks can be used as long as the quality of the obtained single plate laminated material 1 is not extremely deteriorated. The laminated core material 3 is formed by laminating a plurality of laminated plate materials 2 having a plurality of joints a, and the thickness thereof is determined by the veneer laminated material 1 to be obtained. There is no limit.

The laminated core material 3 obtained through the above steps
A single plate 4 having a predetermined length without a seam is laminated and adhered to the surface of the above with the fiber directions parallel to each other and integrated to manufacture the single plate laminated material 1.

A single plate 4 adhered to the surface of the laminated core material 3.
Is different from the laminated plate material 2 in that there is no seam on the entire surface and the entire surface is smoothed, but the thickness is not particularly limited. Although the same thickness as the laminated plate material 2 is used in the embodiment, an extremely thin veneer having a thickness of about 0.5 mm can also be used, and when such a thin veneer is used, The obtained veneer laminate 1 can be made into a desired decorative material 7 simply by cutting.

In the above-mentioned embodiment, the method for manufacturing the veneer laminated material 1 in which the seamless veneers are laminated and adhered on the surface has been described, but the veneer obtained by the method according to claim 8 of the present invention is described. Although the seam is exposed in the surface layer portion of the plate laminated material, since the obtained single plate laminated material has excellent mechanical strength, it can be effectively used as a core material for various structural materials.

[0043]

INDUSTRIAL APPLICABILITY The veneer laminated material of the present invention is formed by laminating and bonding thin veneers of a predetermined length obtained by cutting with a rotary race or a slicer, etc. to form a laminated core material. Since the seamless single plate is integrally bonded to the surface layer of the laminated core material with the fiber direction of the laminated core material parallel to the fiber direction, the bonding of the laminated plate materials is extremely strong and the quality is good. Since it has no variation in mechanical properties, it can be used in a wide range of applications such as construction, industry, and daily necessities.

Further, the decorative material using the single plate laminated material can be easily and easily obtained by simply cutting the single plate laminated material into a desired shape, and has an excellent economical efficiency,
It has a wide variety of variations by changing the thickness and type of surface veneer.

Further, according to the method for producing a laminated veneer of the present invention, hot pressing and cold pressing are alternately applied to a veneer of a predetermined length obtained by cutting with a rotary race or a slicer to correct the corrugation. Since the pretreatment is performed so that the whole surface becomes smooth, the subsequent handling of the veneer can be made extremely easy.

Further, the smoothed veneer symmetrically cuts the edges of both ends in the fiber direction symmetrically to form an inclined cut surface, and symmetrically cuts the edges of the veneer in the front-back direction. Since it is bonded, the veneer itself does not warp or twist after bonding.

A veneer formed by adhering the edges to each other in the same fiber direction to form a long plate is cut into a predetermined length in the fiber direction to form a laminated plate material having seams. Although the materials are laminated and bonded in the same fiber direction, there is no warp or twist in each laminated plate material, so bonding can be performed easily and reliably, and the mechanical strength of the obtained laminated core material is extremely high. In addition to being good, it uses a long single plate and cuts it to a predetermined length before using it, so it is possible to produce a laminated core material at low cost without wasting material. it can.

Since the veneer to be laminated and adhered to the surface of the laminated core material is one having no joint like the laminated plate material, the laminated core material having the joint is hidden inside and the obtained veneer is obtained. Since the laminated material has a very good appearance, it can be used for a wider range of purposes, and by changing the thickness and material of the veneer laminated to the surface of the laminated core material The board laminate can be manufactured simply and easily.

In particular, since the surface of the veneer laminate obtained by the method of the present invention is covered with a seamless veneer, the decorative material can be produced only by cutting the veneer into a desired shape. It has an excellent feature in that it can

Further, in the method for producing a laminated veneer of the present invention using a rotary veneer obtained by cutting a log with a rotary race, the rotary veneer is cut with a knife when producing the rotary veneer. Since the surface of the log material is pressed by a pressure bar for cutting, the obtained rotary veneer has very few cracks, the yield rate in veneer production is very good, and The quality of the plate laminated material can be further improved. In particular, rice logs made of deciduous trees are extremely easy and inexpensive to obtain, so that a large amount of high-quality veneer laminated materials can be provided at low cost.

Further, the veneer laminated material obtained by the method for producing a veneer laminated material of the present invention, in which seamless veneers are not laminated and adhered to each other, has excellent mechanical strength, and thus has a seam. It can be effectively used as a core material for various structural materials.

[Brief description of drawings]

FIG. 1 is a side view of a single plate laminated material of the present invention.

FIG. 2 is an enlarged plan view in which a part of the single plate laminated material in FIG. 1 is cut away.

FIG. 3 is an enlarged perspective view showing a main part of a smoothed single plate used for a single plate laminated material.

FIG. 4 is a perspective view showing a part of a long veneer obtained by adhering the veneers shown in FIG.

5 is a side view exaggeratingly showing a state before smoothing of the single plate shown in FIG. 3. FIG.

FIG. 6 is a perspective view of a decorative material using the single plate laminated material of the present invention.

FIG. 7 is an explanatory view illustrating a step of manufacturing a rotary single plate in the method for manufacturing a single plate laminated material of the present invention.

FIG. 8 is an explanatory view showing a process of manufacturing a veneer by cutting the veneer cut by a rotary race into a predetermined length in a direction perpendicular to the feeding direction.

FIG. 9 is an explanatory diagram illustrating a hot pressing process and a cold pressing process for smoothing a rotary veneer or a slice veneer.

[Explanation of symbols] 1 Veneer laminated material 2 Laminated board material 3 laminated core material 4 Surface veneer in veneer laminated material 5 veneer 5a inclined cut surface a seam 6 Long veneer 7 Cosmetic materials 10 logs 13 drive roll 14 Rotary lace blade 15 Pressure bar 16 rotary veneer 20 Hot press machine 21 Cold press machine

Claims (8)

[Claims] 1. A veneer of a predetermined length having a smooth overall surface, which is obtained by symmetrically cutting the fore edges at both ends in the fiber direction, and adhering the vacancies to each other with the fiber direction of each veneer in the same direction. In addition to the above, the obtained long veneer is cut into a predetermined length in the fiber direction to form a laminated plate material having a seam, and a plurality of these laminated plate materials are laminated and bonded with the fiber directions parallel to each other. A veneer laminated material, characterized in that a seamless veneer having a smooth surface is adhered to and integrated with the surface of the obtained laminated core material. 2. The veneer laminated material according to claim 1, wherein the seamless veneer is a veneer that is the same as or different from the laminated plate material. 3. The veneer laminated material according to claim 1, wherein the seamless veneer is a sheet-shaped or strip-shaped veneer that is thinner than the laminated plate material. 4. A decorative material obtained by cutting the single-plate laminated material according to claim 1 into a desired shape. 5. A method for producing a single plate laminated material, which comprises the following steps (1) to (4). (1) A step in which a thin veneer obtained by cutting with a rotary lace or a slicer is cut into a predetermined length, and then hot pressing and cold pressing are alternately performed to smooth the entire veneer. (2) A step of symmetrically and diagonally cutting the edge at both ends in the fiber direction of the smoothed veneer to form an inclined cut surface at the edge. (3) A step of forming a long veneer by adhering a plurality of veneers having inclined cut surfaces symmetrically formed at the edges of both ends with the same fiber direction and corresponding inclined cut faces. (4) A long veneer is cut into a predetermined length in the fiber direction, and a plurality of laminated plate materials having seams obtained are laminated and adhered with the fiber direction of each laminated plate material being the same, and the laminated plate on the surface. The process of polymerizing and bonding a thin single plate that is seamless to the material. 6. A method for producing a single plate laminated material, which comprises the following steps (a) to (e): (A) A step of manufacturing a thin rotary veneer by cutting a log material with a rotary lace, while pressing the surface portion of the log material to be cut with a knife with a pressure bar. (B) After cutting the obtained rotary veneer into a predetermined length,
This is a process in which hot pressing and cold pressing are performed alternately to smooth the entire rotary veneer. (C) A step of symmetrically obliquely cutting the edges of both ends of the smoothed rotary veneer in the fiber direction to form an inclined cut surface on the edges. (D) A step of forming a long veneer by adhering a plurality of rotary veneers having symmetrically cut inclined surfaces at the edges of both ends with the same fiber direction and corresponding inclined cut surfaces bonded to each other. (E) A long veneer is cut into a predetermined length in the fiber direction, and a plurality of laminated plate materials having seams obtained are laminated and bonded with the fiber directions of the respective laminated plate materials being the same, and the surface laminated plate is also used. The process of polymerizing and bonding a thin single plate that is seamless to the material. 7. The method according to claim 4, wherein the log material is rice wood made of deciduous wood. 8. A method for producing a single plate laminated material, which comprises the following steps (a) to (d): (A) A step of cutting a thin veneer obtained by cutting with a rotary racer or a slicer into a predetermined length, and then hot-pressing and cold-pressing the veneer alternately to smooth the entire veneer. (B) A step of symmetrically cutting the edges of both ends of the smoothed veneer in the fiber direction to form an inclined cut surface on the edges. (C) A step of forming a long veneer by bonding a plurality of veneers having symmetrically cut inclined surfaces at the edges of both ends and adhering the corresponding inclined cut surfaces to each other in the same fiber direction. (D) A step of cutting a long veneer into a predetermined length in the fiber direction, and laminating and bonding a plurality of obtained laminated plate materials having the same fiber direction in each laminated plate material.