JP2021122970A - Manufacturing method of plywood, and woody furniture material - Google Patents

Abstract

To provide a manufacturing method of plywood using domestic coniferous wood, and to provide a woody furniture material also usable for legged furniture using the plywood.SOLUTION: A method of plywood from two wood plates comprises: a step of preparing a first wood plate for forming a thin veneer from coniferous wood; a step of preparing a second wood plate for forming a rotary veneer from the coniferous wood; and an adhesion cold pressing step of performing cold pressing with a pressing machine for one night when being stacked in such a manner that grain directions of the first and second wood plates intersect with each other, and adhere to each other with an adhesive to manufacture a piece of plywood.SELECTED DRAWING: Figure 1

Description

The present invention relates to a plywood manufacturing method for producing plywood by laminating a softwood single plate made of a relatively soft material and a softwood single plate made of a relatively hard material, and a wood furniture material using the plywood.

Conventionally, hardwoods such as beech and birch, which are considered to be suitable for furniture materials, are often used as raw materials, but domestic coniferous cedar and hinoki have a low air-dry specific gravity of 0.38 to 0.44 and are usually used. Compared to furniture wood beech and birch, (a) the surface is easily scratched, (b) dents remain, (c) it is easy to break, and (d) the hozo and dowel are not effective, so it can be used as a furniture material. Deployment is limited.

Generally, hardwoods are hard and durable, and are suitable for manufacturing furniture such as chairs, but there is a problem that the price of raw materials is high. On the other hand, softwood is cheaper than hardwood because it is soft and lacks strength, but it is not very suitable for furniture production. As described above, since the properties and raw material prices differ depending on the type of wood, it is not possible to manufacture furniture using locally produced timber in the area centered on coniferous trees. On the other hand, there is a problem that the price of manufactured furniture is high in the area centered on hardwood.

In recent years, as an alternative to hardwood veneer such as lauan lumber, the use of softwood veneer in which softwood veneer is laminated has been promoted (for example, Patent Document 1).

In Patent Document 1, a building panel such as a floor panel, a wall panel, and a roof panel is formed by attaching a surface layer made of a compression molded board to the surface of a core layer formed by laminating veneers. The core layer is formed by laminating and crimping softwood veneer or hardwood veneer.

Japanese Unexamined Patent Publication No. 8-52703

However, there is a problem that cracks occur in the surface decorative plate of the conventional molded plywood, particularly the bent plywood.

Further, since the bent molded plywood is not only bent in a single direction (single curve) but also in a three-dimensional curved surface (W curve) that is bent in the cross direction, the surface decorative plate needs to have strength to prevent cracking and salmon. ..

Further, in the case of the conventional molded plywood, there is a problem that warpage and twisting phenomena occur.

Further, in the case of the conventional molded plywood, since a hard hardwood is used as the surface material, there is a problem that it is difficult and time-consuming to polish the dough in the process of painting and finishing the bent plywood.

The plywood using softwood veneer described in Patent Document 1 is used as a middle layer of a wooden building panel such as a floor panel, a wall panel, and a roof panel in a panel construction method which is one of the construction construction methods. .. Softwood is not used as a furniture material, especially as a surface material for furniture.

Therefore, an object of the present invention is to provide a plywood manufacturing method for producing plywood using domestically produced softwood, and a wooden furniture material that can also be used for leg furniture using this plywood.

Another object of the present invention is to provide a wooden furniture material capable of easily performing a fabric polishing operation in a coating finishing step, improving work efficiency, and producing furniture at low cost.

According to the present invention, it is a method of producing plywood from two wood boards, a step of producing a first wood board for forming a thin single board from softwood, and a rotary single board for forming a rotary single board from softwood. In the process of producing the second wood board, and when the first wood board and the second wood board are laminated so that the grain directions intersect and bonded with an adhesive, cold pressing is performed overnight with a press machine. It is equipped with an adhesive cold pressure process to produce a single plywood.

By laminating thin veneer from softwood and rotary veneer from broadwood so that the grain direction intersects and bonding with an adhesive, cold pressing is performed overnight (about 12 hours) with a press machine. By performing cold pressure tightening for a long time, the adhesive can soak into the back cracks and close the cracks, and it is possible to suppress the occurrence of cracks in the surface veneer of molded plywood, especially bent plywood. It can also suppress the occurrence of warpage and twisting phenomena. Further, by using the softwood as the surface material, the work of polishing the dough becomes easy in the painting finishing step of the bent plywood, and the work efficiency can be improved.

In the adhesive cold pressure step, the amount of the adhesive applied is preferably increased by 15% as compared with the case of normal adhesion.

After the adhesive cold pressure step, it is more preferable to further include a hot pressure step of heating and pressing the plywood at a temperature of 100 ° C. with a hot press machine.

In the step of producing the first lumber board, it is preferable to make a parquet block by using softwood as a parquet and to form a first timber board made of thinly ground lumber with a band saw.

The thickness of the first wood board and the second wood board is preferably 0.8 mm to 1.5 mm, respectively.

Further, according to the present invention, the wood furniture material is characterized in that the plywood produced by the plywood manufacturing method of the present invention is used as at least a part thereof, and the first wood plate is used as a surface material. ..

According to the plywood manufacturing method of the present invention, a thin veneer made of softwood and a rotary veneer made of broadwood are laminated so that the grain directions intersect and bonded with an adhesive using a press machine. By cold-pressing overnight (about 12 hours) and manufacturing a single plywood, by performing cold-pressing for a long time, the adhesive can soak into the back cracks and close the cracks. It is possible to suppress the occurrence of cracks in the surface veneer of molded plywood, particularly bent plywood, and it is also possible to suppress the occurrence of warpage and twisting phenomena.

Further, according to the wood furniture material of the present invention, the plywood produced by the plywood manufacturing method of the present invention is used as at least a part, and the first wood plate is formed as a surface material, whereby the bent plywood is formed. In the painting finishing process, the work of polishing the fabric is facilitated, and the work efficiency can be improved. Furniture can be easily manufactured at low cost.

It is sectional drawing which shows typically the structure of the plywood manufactured by the plywood manufacturing method which concerns on one Embodiment of this invention. It is an exploded perspective view which shows the structure of the plywood of FIG. 1 schematicly. It is a flowchart which shows outline of the plywood manufacturing method which concerns on one Embodiment of this invention. It is a flowchart which shows roughly the process of making the first wood board from softwood in the plywood manufacturing method of this invention. It is a perspective view which shows the structure of the wood furniture material using the plywood of FIG. 1 schematicly.

Hereinafter, a plywood manufacturing method (2-ply method) according to the present invention and an embodiment of a wood furniture material using the plywood manufactured by this plywood manufacturing method will be described with reference to the drawings.

FIG. 1 shows a cross section of a plywood 100 manufactured by the plywood manufacturing method according to the present invention. FIG. 2 is an exploded perspective view (state before stacking) showing the configuration of the plywood 100.

As shown in FIGS. 1 and 2, the plywood 100 includes a first wood board 10, a second wood board 20, and an adhesive 30. The first wood board 10 and the second wood board 20 are laminated and integrated via an adhesive 30.

The first wood board 10 is a thin veneer formed from softwood. The thickness of the first wood board 10 is preferably 0.8 mm to 1.5 mm. The first lumber board 10 is made of, for example, a parquet made of softwood to make a parquet block, and the parquet block is thinly ground with a band saw.

The second wood board 20 is a rotary veneer formed from hardwood. The rotary veneer is generally machined to a thickness of 0.8 mm, 1.0 mm, 1.2 mm or 1.5 mm. The thickness of the second wood board 20 is preferably 0.8 mm to 1.5 mm. Hardwoods include beech and birch wood.

As the adhesive 30, for example, a urea resin adhesive, a melamine resin adhesive, or a phenol resin adhesive can be used.

FIG. 3 shows the manufacturing process of the plywood 100 and the wood furniture material 200. As shown in FIG. 3, in the plywood manufacturing method according to the present embodiment, first, a first wood board 10 is made from softwood (step S1). In this step S1, as shown in FIG. 4, for example, a cedar stud (thickness (t) 30 × width (w) 105 × length (L) 4000 mm) is cut into a length of 1000 mm and transported to a factory. (Step S11). By setting the length to 1000 mm, the transportation cost can be reduced. Next, a four-sided planer finish is applied to the 1000 mm long cedar studs (step S12). Next, a parquet block is made in consideration of grain and color tone using a plurality of planer-finished cedar studs (step S13). Here, for example, a parquet block of t100 × w600 × L1000 is created. Next, the created t100 × w600 × L1000 parquet block is made into a thin veneer of t1.2 × w600 × L1000 with a band saw (step S14). As a result, the production of the first wood board 10 is completed.

Next, an adhesive is applied to the adhesive surface between the first wood board 10 produced and the rotary veneer (second wood board 20) previously formed from broad-leaved wood (step S2). Here, it is preferable to increase the amount of the adhesive applied by 15% as compared with the case of normal adhesion.

Next, the first wood board 10 to which the adhesive is applied and the second wood board 20 are laminated and bonded so that the grain directions intersect (step S3).

Next, the laminated first wood board 10 and the second wood board 20 are set in a press machine, and cold pressing is performed overnight (about 12 hours) in the press machine at room temperature (step S4). In this adhesive cold pressure step, by performing cold pressure tightening for a long time, the adhesive is dyed in the back crack portion, and the crack can be closed. By this adhesive cold pressure step, one plywood of t2.4 × w600 × L1000 is obtained. When the cold pressing time is short, the back cracked portion is not sufficiently dyed with the adhesive. On the other hand, when the cold pressing time is long, the production efficiency is lowered due to the yield.

Next, the plywood is heat-pressed with a hot press at a temperature of 100 ° C. (step S5). In this heat pressure step, it is preferable to heat and press for 1 minute or more per 1 mm of plywood thickness.

Next, both sides of the plywood 100 that has completed the thermal pressure step are polished with a wide sander machine (step S6). Here, in polishing, the thickness is regulated.

Then, the plywood 100 that has been polished on both sides is made into a double-sided decorative board with the first wood board 10 on the surface, and laminated with the core 40 and an adhesive to prepare a molded product (wood furniture material 200) (step S7). Here, for example, a heating and pressurizing treatment is performed using a press machine for molding plywood equipped with a high frequency device. As the core 40, a rotary single plate made of broadwood, a rotary single plate made of softwood, a rotary single plate made of broadwood, and / or a laminated plywood made of a rotary single plate made of softwood can be used. The structure of the wood furniture material 200 is shown in FIG.

The wood furniture material 200 obtained from the above can be used as a furniture material by being trimmed and then coated with polyurethane. The surface material of the softwood is coated with a sanding sealer 2-3 times, and the finish is coated with a hard coat paint. As a result, the furniture material on which the first wood board 10 formed from the softwood material is surfaced is not inferior in strength to the broadwood material, so that it can be used for producing chairs, tables, boxes and the like.

As described in detail above, the plywood manufacturing method is used when laminating a thin veneer formed of softwood and a rotary veneer formed of broadwood so that the grain directions intersect and bonding them with an adhesive. A single plywood is manufactured by cold-pressing overnight (about 12 hours) with a press machine. The plywood 100 of the present embodiment includes a first wood board 10 made of softwood, a second wood board 20 made of softwood, and an adhesive 30. The wood furniture material 200 is formed by laminating plywood 100 with a core 40 and an adhesive, with the first wood board 10 as a double-sided decorative board on the surface.

As a result, when the softwood veneer and the softwood veneer are laminated and bonded, cold pressure tightening for a long time allows the adhesive to soak into the back cracks and close the cracks. It is possible to suppress the occurrence of cracks in the surface veneer of molded plywood, particularly bent plywood, and it is also possible to suppress the occurrence of warpage and twisting phenomena. Further, since the plywood 100 manufactured by the plywood manufacturing method of the present invention is used as at least a part and the first wood board 10 is formed as a surface material, the bent plywood is painted and the fabric is polished in the finishing step. The work is easy, the polishing cost is reduced to 1/2 or less, and the surface finish is the best. Therefore, work efficiency can be improved. Furniture can be easily manufactured at low cost.

In the above-described embodiment, when the first lumber board 10 is produced from softwood, a production example is described in which a stud material of cedar is cut to a length of 1000 mm to produce a parquet block. It is not limited to this. You may make a parquet block as it is long.

Further, in the above-described embodiment, an example of forming a parquet block when producing the first wood board 10 from softwood has been described, but the present invention is not limited thereto. For example, a rotary veneer made of softwood may be used.

Further, as the wood furniture material 200 of the above-described embodiment, an example of producing a molded product (wood furniture material 200) by using the plywood 100 as a double-sided decorative board with the first wood board 10 on the surface has been described. It is not limited to this. For example, the first wood board 10 may be used as a single-sided decorative board on the surface to make a molded product (wood furniture material 200).

The present invention is not limited to the above-described embodiment, but includes various redesigned forms within the scope of the invention without departing from the gist of the invention described in the claims.

INDUSTRIAL APPLICABILITY The present invention can be used for the purpose of improving work efficiency and easily manufacturing furniture at low cost by using softwood as a furniture material.

10 1st wood board 20 2nd wood board 30 Adhesive 40 Core 100 Plywood 200 Wood furniture material

Claims (6)

It is a method of manufacturing plywood from two wood boards.
The process of producing the first wood board to form a thin veneer from softwood,
The process of producing a second wood board that forms a rotary veneer from hardwood,
When the first wood board and the second wood board are laminated so that the grain directions intersect and bonded with an adhesive, they are cold-pressed overnight with a press machine to produce one plywood. A plywood manufacturing method characterized by having a cold pressure process. The plywood manufacturing method according to claim 1, wherein in the adhesive cold pressure step, the amount of the adhesive applied is increased by 15% as compared with the case of normal adhesion. The plywood according to claim 1 or 2, further comprising a hot-pressing step of heat-pressing the plywood at a temperature of 100 ° C. with a hot press after the adhesive cold-pressing step. Production method. The first wood board according to claim 1 to 3, wherein in the step of producing the first wood board, a softwood material is used as a parquet to make a parquet block, and a first wood board made of thinly ground wood is formed with a band saw. The plywood manufacturing method according to any one of the following items. The plywood manufacturing method according to any one of claims 1 to 3, wherein the thickness of the first wood board and the second wood board is 0.8 mm to 1.5 mm, respectively. Wood furniture characterized in that the plywood produced by the plywood manufacturing method according to any one of claims 1 to 5 is used as at least a part thereof, and the first wood plate is used as a surface material. Lumber.

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