JP2017189916A - Plywood made with used scaffold board, and method for producing plywood with used scaffold board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide plywood that has a texture peculiar to old wood and allows mass production.SOLUTION: A piece of plywood 10 comprises a base plate 20 made of wood, and a decorative sheet 30 that is made of wood and bonded on the surface of the substrate 20. The decorative sheet 30 comprises a plurality of used scaffold boards 40 divided in thickness direction and uses the outer surfaces 42 of the scaffold boards 40 as a design surface. The plywood 10 has an arc shape in cross section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plywood using a used scaffold board and a manufacturing method thereof.

Conventionally, old materials such as pillars and beams generated when demolishing old private houses are reused for various purposes including building materials.
On the other hand, in construction sites such as bridges and buildings, scaffolds for workers to place their feet are temporarily installed (see, for example, Patent Document 1). As a scaffold board used for such a scaffold, Japanese cedar thinned wood is used (see, for example, Patent Document 2). In addition, the scaffold board used and deteriorated for a long time will be disposed of as industrial waste.

Japanese Utility Model Publication No. 6-71748 Japanese Utility Model Publication No. 60-83150

  By the way, since the said old material is produced when demolishing an old private house etc., unlike a new material, it is difficult to obtain the quantity of the thing of desired size. For this reason, a product using old wood has a texture unique to old wood with a feeling of use, but there is a problem that mass production is difficult.

  An object of the present invention is to provide a plywood using a used scaffold board that has a texture unique to an old material and enables mass production, and a method for manufacturing the same.

  A plywood using a used scaffold board for achieving the above object includes a board made of wood and a decorative board made of wood and bonded to the board, and the decorative board has a plurality in the thickness direction. It consists of a divided used scaffolding board, and has the outer surface of the scaffolding board as a design surface.

  According to the structure, the decorative board which comprises a plywood has the outer surface of the used scaffold board as a design surface. For this reason, the design surface of the plywood has a texture peculiar to an old material. Scaffolding boards are used in large quantities at construction sites such as bridges and buildings, and are usually deteriorated and disposed of when used for 2 to 3 years. For this reason, a stable amount of used scaffolding plate can be easily secured.

The plywood is preferably curved or bent.
According to this configuration, since the substrate and the decorative board have a curved shape or a bent shape, the plywood can be used for a wide range of applications such as store interior materials and exterior materials with high design.

  The method of manufacturing the plywood using the used scaffold plate includes a first cutting step of cutting both ends in the longitudinal direction of the scaffold plate, and the scaffold by cutting the scaffold plate into a plurality of pieces in the thickness direction. A second cutting step of forming a decorative plate having the outer surface of the plate as a design surface; and an adhesion step of bonding the decorative plate and the substrate.

Wave nails are struck on both end faces of the scaffolding plate in the longitudinal direction in order to prevent so-called cracks due to drying, so-called cracks at the pierced end.
According to the said structure, a wave nail is removed by cut | disconnecting the longitudinal direction both ends of a scaffold board in a 1st cutting process. Further, in the subsequent second cutting step, the scaffold board is cut into a plurality of sheets in the thickness direction. Thereby, the decorative board which has the surface of a scaffold board as a design surface is formed. And a plywood is formed by adhere | attaching a decorative board and a board | substrate in an adhesion | attachment process. Therefore, it is possible to manufacture a plywood having a texture peculiar to an old material by reusing a used scaffold board.

In the manufacturing method of the plywood using the said used scaffold board, it is preferable to include the removal process which removes a foreign material from the said scaffold board before the said 2nd cutting process.
Concrete, nails, screws, staple needles, etc. are attached to the used scaffold board. According to the said method, a foreign material is removed from a scaffold board | plate by performing a removal process before a 2nd cutting process. For this reason, the adhesiveness is reduced due to the inconvenience that foreign matter becomes an obstacle when cutting the scaffolding plate in the second cutting step, and the foreign matter is interposed between the decorative plate and the substrate in the bonding step. The occurrence of inconvenience can be suppressed. Moreover, the merchantability of the plywood can be improved by removing foreign substances.

  In the manufacturing method of the plywood using the above-mentioned used scaffold board, in the removal step, a metal foreign object such as a nail pierced into the scaffold board using a metal detector, a screw, a staple of a stapler, and the like is detected. It is preferable to remove the detected metal foreign matter.

According to this method, it is possible to detect and reliably remove the metal foreign matter existing on the surface and inside of the scaffold plate.
In the method for manufacturing a plywood using the above-mentioned used scaffolding board, the bonding step includes interposing an adhesive between the decorative board and the substrate, and pressurizing and heating the decorative board and the substrate with a mold. It is preferable to include a forming step of forming into a curved shape or a bent shape.

  According to this method, the decorative board and the substrate can be easily formed into a curved shape or a bent shape.

  According to the present invention, it is possible to achieve mass production while having a texture peculiar to old materials.

About embodiment of the plywood using a used scaffold board, (a) is the perspective view seen from the front side of the plywood. (B) is the perspective view seen from the back side of the plywood. The perspective view of the scaffold board used for manufacture of the plywood of the embodiment. The top view of the scaffold board used for manufacture of the plywood of the embodiment. (A)-(c) is a figure which shows the procedure of manufacture of the plywood of the embodiment. (A), (b) is a figure which shows the procedure of manufacture of the plywood of the embodiment. (A), (b) is a figure which shows the procedure of manufacture of the plywood of the embodiment. (A), (b) is a figure which shows the procedure of the adhesion | attachment process of the embodiment. The perspective view seen from the front side of the plywood of a modification. The perspective view seen from the front side of the plywood in another modification. The perspective view of the plywood in another modification. The perspective view of the plywood in another modification.

Hereinafter, an embodiment will be described with reference to FIGS.
As shown in FIG. 1 (a) and FIG. 1 (b), the plywood 10 is suitable for use as, for example, a store interior material or an exterior material, and has a rectangular shape in front view and a short side of the rectangle. It is curved in an arc shape along the direction.

  The plywood 10 is composed of a single board made of wood in order from the inner peripheral side, and is composed of a first substrate 21 and a second substrate 22 bonded to each other, and a used scaffolding plate 40. And a plurality of decorative panels 30 bonded together.

  As shown in FIG. 1A, the plurality of decorative plates 30 all have the same shape, that is, a rectangular shape in front view, and have the outer surface 42 of the scaffold plate 40 as a design surface. . Therefore, the design surface of the decorative board 30 constitutes the outer peripheral surface of the plywood 10 curved in an arc shape. In the present embodiment, the plurality of decorative plates 30 are arranged in parallel so that the long sides of the plurality of decorative plates 30 and the short sides of the plywood 10 coincide.

Next, with reference to FIGS. 2-7, the manufacturing method of the plywood 10 is demonstrated.
As shown in FIGS. 2 and 3, the scaffold board 40 that is a raw material of the decorative board 30 is used for a temporary scaffold for an operator to put a foot on a construction site such as a bridge or a building. It has a rectangular plate shape of 4000 mm, width 200 mm, and thickness 35 mm. The scaffold board 40 is made of a single board of thinned cedar. On both end faces 41 in the longitudinal direction of the scaffold board 40, wave nails 51 for preventing cracks due to drying, that is, so-called cracks at the end of the neck, are hit.

<Procedure for manufacturing decorative plate 30>
When manufacturing the decorative board 30, first, the both ends of the longitudinal direction of the scaffold board 40 are cut | disconnected along the virtual line L1 shown with a dashed-two dotted line in FIG. 3, for example with an electric circular saw (1st cutting process) ). Further, the scaffold plate 40 is cut into two equal parts in the length direction along the phantom line L2 indicated by a two-dot chain line in FIG. Thereby, the scaffold board 40 of length 1900mm, width 200mm, and thickness 35mm is formed.

Subsequently, as shown in FIG. 4A, the scraper 60 scrapes off and removes foreign matters such as concrete adhering to the surface of the scaffold board 40 (removal step).
Subsequently, as shown in FIG. 4B, foreign matter such as pebbles and dust entering the recesses on the surface of the scaffold plate 40 is removed by washing the scaffold plate 40 with the high-pressure washing machine 61 (removal step). ).

Thereafter, as shown in FIG. 4C, the plurality of scaffold plates 40 are naturally dried in a state of being separated from each other (first drying step).
Next, as shown in FIG. 5 (a), the metal detector 62 detects metal foreign objects such as nails 71, screws 72, staples 73 of the stapler that are stuck into the scaffold plate 40, and the detected metal foreign objects. Is removed using pliers or the like (removal step). In the present embodiment, as the metal detector 62, a so-called meter detector that can detect the presence or absence of a metal having a thickness of several hundred μm or more, such as a needle broken in a clothing garment factory or a stapler needle, is used.

Subsequently, the scaffold plate 40 is naturally dried in the same manner as in the first drying step (second drying step).
Subsequently, as shown in FIG. 5B, the sanding machine 63 polishes the four surfaces of the scaffold plate 40, the front surface, the back surface, and the side surfaces along the longitudinal direction.

Thereafter, in the same manner as in the first drying step, the scaffold board 40 is naturally dried (third drying step).
Next, as shown to Fig.6 (a), the scaffold board 40 is cut | disconnected to 3 sheets in the thickness direction with a band saw (2nd cutting process). As a result, the two decorative plates 30 having a thickness of about 10 mm and the intermediate plate 80 having the outer surface 42 on the front side or the outer surface 42 on the back side of the scaffold plate 40 are formed.

  Subsequently, planarization is performed on a surface 43 (cut surface) of the decorative plate 30 opposite to the outer surface 42 of the scaffold plate 40. Thereby, as shown in FIG.6 (b), the said surface 43 (lower surface of the same figure) of the said opposite side is made smooth, and the thickness of the decorative board 30 is equalized to 5 mm.

<Molding mold 90>
As shown in FIGS. 7A and 7B, the forming die 90 includes a fixed die 91 having an arcuate curved concave portion 911 on the upper surface and a movable die 92 having an arcuate curved convex portion 921 on the lower surface. The fixed mold 91 and the movable mold 92 are heated when energized.

<Adhesion and Forming Method of First Substrate 21, Second Substrate 22, and Decorative Plate 30>
As shown in FIG. 7A, a plurality of decorative plates 30, one second substrate 22, and one first substrate 21 are placed in the same order on the upper surface of the fixed mold 91. At this time, the outer surface 42 of the decorative board 30 is directed downward. The adhesive 11 is provided between the decorative plate 30 and the second substrate 22 and between the second substrate 22 and the first substrate 21.

  Subsequently, the fixed mold 91 and the movable mold 92 are energized and heated, and the movable mold 92 is brought close to the fixed mold 91 to pressurize and heat the first substrate 21, the second substrate 22, and the decorative board 30. By doing so, it is formed into a circular arc cross section (adhesion step). Thereby, the plywood 10 shown to Fig.1 (a) and FIG.1 (b) is manufactured.

According to the plywood using the used scaffold board and the method for manufacturing the plywood using the used scaffold board according to the present embodiment described above, the following effects can be obtained.
(1) The plywood 10 includes a substrate 20 made of wood and a decorative plate 30 made of wood and bonded to the substrate 20. The decorative board 30 includes a used scaffold board 40 divided into a plurality of parts in the thickness direction, and has an outer surface 42 of the scaffold board 40 as a design surface.

  According to such a structure, the decorative board 30 which comprises the plywood 10 has the outer surface 42 of the used scaffold board 40 as a design surface. For this reason, the design surface of the plywood 10 has a texture peculiar to an old material. Moreover, the scaffold board 40 is used in large quantities at construction sites such as bridges and buildings, and is usually deteriorated and disposed of when used for 2 to 3 years. For this reason, the used amount of used scaffold board 40 can be ensured easily. Therefore, it can have a texture unique to old wood and can be mass-produced.

(2) The plywood 10 (the substrate 20 and the decorative plate 30) has an arc shape. For this reason, the plywood 10 can be used for wide uses, such as a store interior material and exterior material with high design property.
(3) The manufacturing method of the plywood 10 includes a first cutting step of cutting both ends in the longitudinal direction of the scaffold board 40, and an outer surface 42 of the scaffold board 40 by cutting the scaffold board 40 into a plurality of sheets in the thickness direction. Including a second cutting process for forming the decorative board 30 having a design surface and an adhesion process for bonding the decorative board 30 and the substrate 20.

  According to such a configuration, the corrugated nail 51 is removed by cutting both longitudinal ends of the scaffold plate 40 in the first cutting step. Moreover, the scaffold board 40 is cut | disconnected in multiple pieces in the thickness direction in the 2nd cutting process after that. Thereby, the decorative board 30 which has the outer surface 42 of the scaffold board 40 as a design surface is formed. And the laminated board 30 and the board | substrate 20 are adhere | attached in an adhesion | attachment process, and the plywood 10 is formed. Therefore, it is possible to manufacture the plywood 10 having a texture peculiar to an old material by reusing the used scaffold board 40.

(4) The manufacturing method of the plywood 10 includes a removing step of removing foreign matter from the scaffold plate 40 before the second cutting step.
Concrete, nails, screws, staple needles or the like are attached to the used scaffold plate 40.

  According to the said method, a foreign material is removed from the scaffold board 40 by performing a removal process before a 2nd cutting process. For this reason, in the second cutting step, the foreign matter becomes an obstacle when cutting the scaffold plate 40, and the adhesiveness is reduced due to the presence of the foreign matter between the decorative board 30 and the substrate 20. The occurrence of inconvenience can be suppressed. Moreover, the merchantability of the plywood 10 can be improved by removing foreign substances.

(5) In the removal step, the metal detector 62 is used to detect the metal foreign matter present on the surface and inside of the scaffolding plate 40, and the detected metal foreign matter is removed.
According to such a method, the metal foreign substance which exists in the surface and inside of the scaffold board 40 can be removed reliably.

(6) The manufacturing method of the plywood 10 includes a polishing step of polishing the surface of the scaffold plate 40 before the second cutting step.
According to such a method, the rough portion of the surface of the scaffold board 40 can be smoothed while leaving the texture peculiar to the old material.

  (7) The bonding step is a molding step in which the adhesive 11 is interposed between the decorative plate 30 and the substrate 20 and the decorative plate 30 and the substrate 20 are pressed and heated by the molding die 90 to form an arc shape. Including.

According to such a method, the decorative board 30 and the board | substrate 20 can be easily shape | molded by circular arc shape.
<Modification>
In addition, the said embodiment can also be changed as follows, for example.

In the above embodiment, the scaffold board 40 is cut into two equal parts in the length direction after the first cutting step, but the scaffold board 40 is cut into three equal parts according to the size of the plywood 10. You can also.
As shown in FIG. 8, the plurality of decorative plates 30 can be arranged side by side so that the long sides of the plurality of decorative plates 30 in the front view coincide with the long sides of the plywood 10.

-As shown in FIG. 9, you may make it comprise the internal peripheral surface of the plywood 10 in which the design surface of the decorative board 30 curved in circular arc shape.
The shape of the plywood 10 is not limited to the curved shape such as the arc shape illustrated in the above embodiment. In addition, for example, as shown in FIG. 10, the shape of the plywood 10 may be a shape bent at, for example, 90 degrees. Further, the number of bent portions is not limited to one, and the plywood 10 may have two bent portions as shown in FIG. Moreover, in the example shown in FIG.10 and FIG.11, although the decorative board 30 is arrange | positioned at the inner peripheral side, the decorative board 30 can also be arrange | positioned at the outer peripheral side.

The plywood 10 may be a flat plate.
In the above embodiment, the base material bonded to the decorative board 30 is composed of the first substrate 21 and the second substrate 22, but the number of substrates can be one or three or more. . Further, the number of decorative boards 30 constituting the plywood 10 can be changed to an arbitrary number.

  DESCRIPTION OF SYMBOLS 10 ... Plywood, 11 ... Adhesive, 20 ... Board | substrate, 21 ... 1st board | substrate, 22 ... 2nd board | substrate, 30 ... Decorative board, 63 ... Sanding machine, 40 ... Scaffold board, 41 ... End face, 42 ... Outer surface, 43 ... opposite surface, 51 ... wave nail, 60 ... scraper, 61 ... high pressure washer, 62 ... metal detector, 71 ... nail, 72 ... screw, 73 ... needle, 80 ... intermediate plate, 90 ... mold, 91 ... fixed type, 911 ... curved concave part, 92 ... movable type, 921 ... curved convex part.

Claims (6)

A substrate made of wood,
A decorative plate made of wood and bonded to the substrate,
The decorative board is composed of a used scaffold board divided into a plurality in the thickness direction, and has the outer surface of the scaffold board as a design surface.
Plywood using used scaffolding board. A curved or bent shape,
A plywood using the used scaffold board according to claim 1. A method of manufacturing plywood using a used scaffold board,
A first cutting step of cutting both longitudinal ends of the scaffold plate;
A second cutting step of forming a decorative board having an outer surface of the scaffold board as a design surface by cutting the scaffold board into a plurality of sheets in a thickness direction;
A bonding step of bonding the decorative plate and the substrate,
A method of manufacturing plywood using a used scaffold board. In the manufacturing method of the plywood using the used scaffold board of Claim 3,
Prior to the second cutting step, including a removal step of removing foreign matter from the scaffold plate,
A method of manufacturing plywood using a used scaffold board. In the removing step, the metal foreign object present on the surface and inside of the scaffold plate is detected using a metal detector, and the detected metal foreign object is removed.
The manufacturing method of the plywood using the used scaffold board of Claim 4. The bonding step includes a molding step in which an adhesive is interposed between the decorative plate and the substrate, and the decorative plate and the substrate are molded into a curved shape or a bent shape by pressing and heating the decorative plate and the substrate with a molding die. ,
The manufacturing method of the plywood using the used scaffold board as described in any one of Claims 3-5.

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