JP2006130787A - Compressed wooden product and method for producing compressed wooden product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressed wooden product which can improve its strength and is molded easily and a method for producing the compressed wooden product. <P>SOLUTION: After an outer member of wood is compressed in a prescribed shape, an inner member which has an outer side in a shape corresponding to the inner side of the compressed outer member, makes a plurality of protrusions protrude from the outer side, and is formed from a substance having strength higher than that of the outer member is laid on the outer member to overlap each other, the protrusions are pushed into the outer member, and the outer and inner members are compressed again to make the inner side of the outer member adhere to the outer side of the inner member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressed wood product produced by compressing wood and a method for producing the compressed wood product.

  In recent years, a technique for processing a predetermined shape by compressing wood has been attracting attention. Wood, which is a natural material, has a variety of grain, so individual differences occur depending on the location of the raw wood, which is the raw wood, and the individual differences become the individuality of each product. In addition, scratches and changes in color caused by long-term use may also have a unique texture and may be familiar to the user. For these reasons, wood is attracting attention as a material that can produce unique and tasty products that are not found in products using synthetic resins or light metals.

  Conventionally, as a wood compression processing technology, a piece of wood that has been softened by water absorption is compressed, and the wood is cut substantially parallel to the compression direction to obtain a plate-like primary fixed product, and then this primary fixed product is heated and absorbed by water. There is known a technique of forming a predetermined three-dimensional shape while performing the process (for example, see Patent Document 1). There is also known a technique in which a piece of wood compressed in a softened state is temporarily fixed with a predetermined mold, and this wood is restored in a mold and molded (for example, see Patent Document 2). ).

Japanese Patent No. 3078452 JP-A-11-77619

  When compressing wood as described above, it is necessary to determine the thickness and compression ratio of the wood in consideration of various points including individual differences and types of wood, strength of the processed wood, and its use. . For example, in order to improve the strength of the processed wood, it is necessary to increase the thickness of the wood to some extent. However, when the thickness of the wood is increased, there is a problem in that the degree of difficulty in forming by compression processing increases.

  In order to solve this problem and make molding easier, the wood must be thinned, but if the wood is thinned, there is a risk that it will not be possible to achieve an increase in strength. It was considered difficult to achieve both the ease of molding simultaneously.

  The present invention has been made in view of the above, and an object of the present invention is to provide a compressed wood product that can improve strength and can be easily molded, and a method for manufacturing the compressed wood product.

  In order to solve the above-described problems and achieve the object, a compressed wood product according to the first aspect of the present invention includes an outer member made of wood compressed into a predetermined shape, and substantially the same shape as the inner side surface of the outer member. A plurality of projecting portions projecting from an outer surface forming an inner member made of a material having a strength higher than that of the outer member, and the plurality of projecting portions are pushed into the outer member by external pressure, The inner surface of the material and the outer surface of the inner member are in close contact with each other.

  According to a second aspect of the invention, in the first aspect of the invention, the inner member includes at least one of a metal and a thermoplastic resin.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a height at which the protruding portion protrudes from an outer surface of the inner member is smaller than a thickness of the outer member.

  A fourth aspect of the present invention is characterized in that in the invention according to any one of the first to third aspects of the present invention, it is an exterior material for packaging an electronic device.

  Invention of Claim 5 is a manufacturing method of the compression wooden product provided with the compression-processed wood, Comprising: The primary compression process which compresses the outer member which consists of wood to a predetermined shape, The outer member compressed by the said primary compression process A plurality of protrusions projecting from the outer surface, and an inner member made of a material having a higher strength than the outer member is stacked on the outer member, A secondary compression step of compressing the inner member together.

  The invention according to claim 6 is the invention according to claim 5, wherein the primary compression step is performed until the thickness of the outer member is substantially the same as the thickness of the outer member after the secondary compression step. It is characterized by compressing the material.

  The invention according to claim 7 is the invention according to claim 5 or 6, wherein the shape of the inner member is substantially the same before and after the secondary compression step.

  According to the present invention, after compressing an outer member made of wood into a predetermined shape, the outer member has an outer surface that has a shape corresponding to the inner surface of the compressed outer member, and a plurality of protrusions protrude from the outer surface. An inner member made of a material having higher strength than the outer member is stacked on the outer member, and the plurality of protrusions are pushed into the outer member so that the inner surface of the outer member and the outer surface of the inner member are in close contact with each other. Thus, by compressing again, the strength can be improved, and a compressed wooden product that can be easily molded and a method for manufacturing the compressed wooden product can be provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a configuration of a compressed wood product according to an embodiment of the present invention. 2 is an exploded perspective view of the compressed wood product shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. The compressed wooden product 1 shown in FIGS. 1 to 3 includes a wooden outer member 11 having a substantially bowl shape, and a metal inner member 12 having an outer surface that is in close contact with the inner surface of the outer member 11.

  The external material 11 is formed by compressing wood, and rises in a direction substantially perpendicular to the main plate portion 11a along the longitudinal direction of the main plate portion 11a and the main plate portion 11a. There are two side plate portions 11b that extend, and two side plate portions 11c that rise and extend in a direction substantially perpendicular to the main plate portion 11a along the short direction of the main plate portion 11a.

  The inner member 12 is made of a material that has higher strength against bending and tension than the outer member 11, and more specifically, is made of a metal (aluminum, stainless steel, titanium, iron, etc.) processed into a predetermined shape. The inner member 12 includes a main plate portion 12a having a substantially rectangular surface, two side plate portions 12b rising and extending in a direction substantially orthogonal to the main plate portion 12a along the longitudinal direction of the main plate portion 12a, and a main plate It has two side plate portions 12c that rise and extend in a direction substantially orthogonal to the main plate portion 12a along the short direction of the portion 12a. The side surface (outer side surface) on the protruding side of the inner member 12 has substantially the same shape as the side surface (inner side surface) on the recessed side of the outer member 11.

  A plurality of projecting portions 121 projecting outward are provided on the outer side surfaces of the side plate portions 12b and 12c of the inner member 12 (six in the case shown in FIG. 2). These protrusions 121 are pushed into the inner surface of the outer member 11 to fix the outer member 11 and the inner member 12 and prevent the outer member 11 from being displaced or peeled from the inner member 12. Have

  FIG. 4 is a view showing the shape of the protruding portion 121, and is a partially enlarged perspective view of the vicinity of the protruding portion 121 in the inner member 12 of FIG. The projecting portion 121 shown in FIG. 4 has a substantially triangular pyramid shape, and a straight cut parallel to the surface of the main plate portion 12a is made in a predetermined portion of the side plate portions 12b and 12c, and the cut portion is pushed outward. It is formed by projecting from the outer side surface of the side plate portion 12b or 12c.

  Next, a method for manufacturing a compressed wood product according to this embodiment will be described. First, the wood that is the raw material of the outer member 11 is shaped from a solid material in an uncompressed state by an amount that is added in advance to a volume that is reduced by a compression process described later. At this time, the timber is shaped like a flat plate and its longitudinal direction is substantially parallel to the fiber direction of the solid wood.

  FIG. 5 is an explanatory diagram schematically showing a situation in which wood is shaped so as to be substantially parallel to the fiber direction L of the solid material 50. Of the timbers 51, 52, and 53 shown in FIG. 5, the timber 51 is shaped like a flat plate when shaped. On the other hand, in the case of the timber 52, a flat surface forms a grain surface. In the case of the wood 53, a flat surface forms a memorial surface. As for how to shape the wood including these examples, an optimum one is adopted in consideration of conditions such as strength required as the outer member 11 and aesthetics as an exterior material. Thus, the manufacturing method of the compressed wood product which concerns on this Embodiment does not depend on what surface the surface of the shaped wood makes | forms. For this reason, when describing the outer member 11 with drawing, the grain is abbreviate | omitted.

  In addition, the solid material 50 used in this embodiment is a camellia, a camellia leaf, a paulownia, a cedar, a pine, a cherry, a persimmon, an ebony, a teak, a mahogany, a rosewood, etc. These solid materials 50 can be used in all the embodiments of the present invention, and an optimum type is selected according to the use of the compressed wood product.

  Then, the primary compression process which compresses the outer member 11 to a predetermined shape is demonstrated. FIG. 6 is an explanatory diagram showing an outline of the primary compression process of the outer member 11. As shown in FIG. 6, in the primary compression step, the outer member 11 is compressed using two molds 61 and 71. Of the two molds, a mold 61 that applies a compressive force to the outer member 11 from above the outer member 11 during compression has a convex portion 62 that projects downward. On the other hand, the mold 71 that applies a compressive force to the outer member 11 from below the outer member 11 during compression has a recessed portion 72 that is recessed downward.

  When performing this primary compression step, the outer member 11 is first left in a high-temperature and high-pressure steam atmosphere for a predetermined time. Thereby, the outer member 11 absorbs moisture excessively and softens. Thereafter, the outer member 11 is sandwiched and compressed so that at least one of the two molds 61 and 71 is brought close to the other mold in the same water vapor atmosphere. FIG. 7 is a longitudinal sectional view (corresponding to a cross section taken along line BB in FIG. 6) showing this compressed state. As shown in FIG. 7, the outer member 11 is deformed into a three-dimensional shape corresponding to the gap between the convex portion 62 and the concave portion 72 by sandwiching and compressing the outer member 11 between the two molds 61 and 71. In the case of FIG. 7, the thickness r of the outer member 11 after compression is substantially uniform.

  When the thickness of the outer member 11 formed from the solid material 50 is R, the compression rate C of the outer member 11 in the primary compression step described above is given by (R−r) / R. A specific numerical example of the compression rate C is about 0.5 to 0.7.

  After leaving in a compressed state shown in FIG. 7 for a predetermined time, the mold 61 and the mold 71 are separated to release the compression, the water vapor atmosphere is released, and the outer member 11 is dried. Depending on the material of the wood forming the outer member 11, when the two dies 61 and 71 are separated, the original shape may be restored. In this case, in a state where the outer member 11 is held between the molds 61 and 71, the compression is released and drying is performed. The drying time of the external material 11 is set to an optimum value according to the shape and type.

  In this primary compression step, the thickness of the outer member 11 is made substantially the same as the thickness after the completion of the secondary compression step, which will be described later, but the shape of the outer member 11 after the primary compression step is on the inner surface thereof. Any shape that can be placed so that the outer surfaces of the inner members 12 face each other is acceptable. More specifically, in the outer member 11 after the primary compression step, the angle at which the side plate portions 11b and 11c rise from the main plate portion 11a is smaller than the final shape, and the inner member 12 and the outer member 11 are overlapped before the secondary compression step. In this case, the protruding portion 121 may be shaped so as not to be caught on the side plate portions 11b and 11c. This is because when the inner member 12 and the outer member 11 are overlapped before the secondary compression step, the protruding portion 121 of the inner member 12 is caught by the upper end portions of the side plate portions 11b and 11c, and the outer surface of the inner member 12 is externally attached. This is to prevent it from being placed on the inner surface of the material 11.

  After the primary compression step described above, the inner member 12 is placed on the inner side surface of the outer member 11 from above in a water vapor atmosphere similar to the primary compression step, and both are compressed together (secondary Compression process). FIG. 8 is an explanatory diagram showing an outline of the secondary compression process. FIG. 9 is a longitudinal sectional view as seen from a cut surface in the vertical direction passing through the protruding portion 121 of the inner member 12 in order to show the situation before the compression force is applied in the secondary compression step (CC in FIG. 8). Corresponding to a line cross section or a DD line cross section).

  As shown in FIGS. 8 and 9, the mold 81 that applies a compressive force to the inner member 12 from above has a convex portion 82 that fits on the inner surface of the inner member 12. In this embodiment, the inner member 12 is made of metal, and the inner side surface thereof is substantially the same shape as the outer side surface of the convex portion 82. Therefore, the shape of the inner member 12 remains substantially the same before and after the secondary compression step. is there. For this reason, the inner member 12 fitted to the mold 81 substantially plays the role of one mold for compressing the outer member 11. On the other hand, the mold 91 that applies a compressive force to the outer member 11 from below has a recess 92 into which the outer surface of the outer member 11 is fitted.

  FIG. 10 is a view showing a state in which the two molds 81 and 91 are brought close to each other and the outer member 11 and the inner member 12 are sandwiched and a compressive force is applied, and is a longitudinal sectional view seen from the same cut surface as FIG. It is. From the state shown in FIG. 9 until the state shown in FIG. 10 is reached, the side plate portions 11b and 11c of the outer member 11 gradually rise and approach the inner member 12, and eventually the protruding portion 121 becomes the side plate portions 11b and 11c. It is pushed into the inner surface of the. At this time, since the outer member 11 has absorbed and softened moisture in a high-temperature and high-pressure steam atmosphere, the protrusion 121 smoothly enters the inner surface of the outer member 11. Thereafter, the inner surface of the outer member 11 and the outer surface of the inner member 12 are brought into close contact with each other and reach the state shown in FIG.

  After a predetermined time has elapsed in the compressed state shown in FIG. 10, the compression of the integrated outer member 11 and inner member 12 is released and dried to complete the compressed wooden product 1. Here, the resin component of the wood forming the outer member 11 oozes out and plays the role of an adhesive between the inner member 12, but depending on the material of the outer member 11 and the inner member 12, both members contact each other. You may perform a secondary compression process, after apply | coating a suitable quantity of adhesives to a surface.

  As described above, after the outer member 11 made of wood is primarily compressed into a predetermined shape, the inner member 12 made of metal is overlaid on the outer member 11, and the plurality of protruding portions 121 are pushed into the outer member 11 to be put into the outer member 11. The outer member 11 (wood) is increased in fiber density and strength by second compression so that the inner side surface of the inner member and the outer side surface of the inner member 12 are in close contact with each other. Furthermore, since the high strength inner metal member 12 is stably fixed, the strength as a compressed wood product is further increased.

  Further, if the thickness R of the outer member 11 formed from the solid material 50 is reduced, the outer member 11 can be easily molded. However, in this case, the strength problem concerned is that the metal inner member 12 is provided. Therefore, it is possible to simultaneously realize ease of molding of compressed wood products and improvement of strength.

  FIG. 11 shows an example of application of the compressed wood product 1 formed as described above. More specifically, the external configuration of the digital camera when the exterior material of the digital camera is formed using the compressed wood product 1. FIG. In the digital camera 100 shown in FIG. 1, two cover members 2 and 3 respectively formed by providing an opening, a notch or the like in the compressed wood product 1 are combined to form an exterior material.

  FIG. 12 is a perspective view showing a schematic configuration of the cover members 2 and 3. As shown in FIG. 12, the cover member 2 includes a wooden outer member 211 and a metal inner member 212, while the cover member 3 includes a wooden outer member 311 and a metal inner member 312. These cover members 2 and 3 are obtained by appropriately providing openings and notches in a compressed wood product formed by the above-described method for producing a compressed wood product.

  A specific configuration of each cover member will be described. The main plate 2 a of the cover member 2 is formed with a cylindrical opening 21 that exposes the imaging unit 4 including the imaging lens and a rectangular parallelepiped opening 22 that exposes the flash 5. Further, the side plate portions 2b and 2c of the cover member 2 are formed with a semicylindrical cutout 23 and a rectangular parallelepiped cutout 24, respectively.

  On the other hand, the main plate portion 3a of the cover member 3 has a rectangular parallelepiped that displays a display portion 6 that is realized by using a liquid crystal display, a plasma display, an organic EL (Electroluminescence) display, or the like to display image information and character information. A shaped opening 31 is formed. A semi-cylindrical cutout 32 and a rectangular parallelepiped cutout 33 are formed in the side plate portions 3b and 3c of the cover member 3, respectively.

  Of the openings and cutouts provided in the cover members 2 and 3, the openings and cutouts provided in the outer members 211 and 311 are collectively formed when the raw material wood is formed from the solid material 50. Alternatively, it may be formed by cutting, drilling or the like after the primary compression process or after the secondary compression process. On the other hand, the openings and notches provided in the inner members 212 and 312 are formed by punching when the inner members 212 and 312 are formed.

  In addition to the opening and notch described above, an opening or notch for attaching a finder or exposing an operation input button may be provided, or a speaker provided inside the digital camera 100 is generated. In order to output sound to the outside, a sound output hole portion including a plurality of small hole portions may be provided.

  When the digital camera 100 is assembled using the cover members 2 and 3 having the above configuration, the notch 23 of the cover member 2 and the notch 32 of the cover member 3 face each other to form a cylindrical opening 41, and the shutter button Express 7 Further, the notch 24 of the cover member 2 and the notch 33 of the cover member 3 face each other to form a rectangular parallelepiped opening 42, and a connection device for connecting to an external device such as a personal computer is exposed. This connection device is, for example, a connection terminal such as a USB, a mounting device for mounting an external storage medium such as an xD picture card or smart media, and a plug-in jack such as a power source. In order to protect these connection devices when not in use, a lid may be attached to the opening 42.

  When the digital camera 100 is assembled, an adhesive or the like is applied and bonded to a portion where the cover member 2 and the cover member 3 are in contact with each other. Thereafter, the outer periphery of the joint portion between the two cover members 2 and 3 may be sealed using a sealing member made of an elastic member or the like. Further, a groove is formed in the end of the side plate of one of the cover members 2 and 3 of the two cover members 2 and 3 to be joined, and the end of the side plate of the other cover member. A protrusion that can be fitted into the groove may be formed, and both may be fitted together at the time of joining.

  FIG. 13 is a cross-sectional view taken along line E-E in FIG. 11, and shows a schematic configuration inside the digital camera 100. As shown in FIG. 13, the digital camera 100 includes a control circuit that performs drive control relating to imaging processing and the like, an imaging element such as a CCD (Charge Coupled Device), and a microphone and a speaker that perform audio input and output. The control part 8 containing an electronic member is accommodated. Among these, the control circuit is realized by a CPU (Central Processing Unit) having calculation and control functions, and a flash memory for storing various information such as a program for starting a predetermined OS (Operation System).

  As described above, when the compressed wood product according to this embodiment is applied to an electronic device such as a digital camera, the strength required as an exterior material can be obtained without affecting the appearance of the electronic device. In addition, since the grain and irregularities of the wood forming the exterior material surface serve to prevent slipping, it is possible to improve operability when the electronic device is operated by hand.

  Electronic devices to which the compressed wood product according to this embodiment can be applied as an exterior material include a portable communication terminal such as a mobile phone, PHS or PDA, MD, CD, DVD or cassette tape in addition to a digital camera. There are portable audio devices that are equipped with audio recording media and output audio, IC recorders, portable televisions, portable radios, remote controls for various home appliances, digital video, and the like. In addition, the compressed wood product according to this embodiment can be applied to uses other than the exterior material of the electronic device.

  According to the embodiment of the present invention described above, after the outer member made of wood is primarily compressed into a predetermined shape, the outer surface has a shape corresponding to the inner surface of the compressed outer member. A plurality of protrusions protrude from the outer surface, an inner member made of metal is stacked on the outer member, and the plurality of protrusions are pushed into the outer member so that the inner surface of the outer member and the outer surface of the inner member are in close contact with each other Thus, by performing secondary compression, strength can be improved, and a compressed wooden product that can be easily molded and a method for manufacturing the compressed wooden product can be provided.

  In addition, according to this embodiment, since the projecting portion provided on the inner member is pushed into the wood constituting the outer member by the compression force applied in the secondary compression step, the outer member and the inner member Even when the Young's modulus, the linear expansion coefficient, the humidity expansion coefficient, etc. are greatly different from each other, there will be no occurrence of deviation or peeling due to external force or temperature / humidity changes.

  Here, a numerical example suitable for forming a cover member that forms an exterior material of a small portable digital camera will be given. First, a plate-like wood (outer member) having a thickness R of about 2 mm is formed and compressed in two compression steps until the thickness becomes about 0.8 mm. On the other hand, the thickness of the metal forming the inner member is about 0.4 mm. Therefore, the thickness of the whole compressed wood product is about 1.2 mm plus the thickness of the adhesive.

  As mentioned above, although one embodiment considered to be the best in carrying out the present invention has been described in detail, the present invention is not limited only by this embodiment.

  For example, the protrusion protruding from the inner member has a shape other than the shape described above (see FIG. 4) as long as it satisfies the condition that the height protruding from the outer surface of the inner member is thinner than the thickness of the outer member. Various shapes can be devised. Specifically, a protrusion having a two-dimensional planar shape may be protruded from the outer surface of the inner member, or a surface such as a wholesaler with a number of sharp protrusions on the outer surface of the inner member. You may make it a shape. Further, the shape of each protrusion may be a simple protrusion such as a cylindrical shape. Furthermore, the side plate portion of the inner member may be formed into a corrugated shape or an uneven shape. These protrusions can be arranged irregularly. Thus, what is necessary is just to make the shape and installation location of a protrusion part optimal according to conditions, such as the material of the wood which makes | forms an outer member other than the shape and use of a compressed wood product.

  Moreover, a metal die-cast may be used as the inner member 12, or a thermoplastic resin such as polycarbonate, polyamide, or ABS may be used. In the case of a thermoplastic resin, it is also possible to apply a reinforced resin obtained by reinforcing the thermoplastic resin with glass fibers or the like.

  Furthermore, in the above-described embodiment, the plate-shaped wood is shaped from a solid material, but may be shaped in a predetermined three-dimensional shape in advance. In this case, the openings and notches may be formed together at the stage of shaping the wood, or the openings and notches may be formed by cutting or drilling after the primary or secondary compression step.

  Moreover, you may bake the surface of the outer member which is the wood which gave the compression process. In this way, when the surface of the outer member is baked, a carbonized layer is formed. This carbonized layer is an electromagnetic shield material that is much lighter than metal, and thus is suitable as a casing for a portable electronic device. This is particularly effective when a thermoplastic resin having no electromagnetic shielding effect is used as the inner member.

  As is clear from the above description, the present invention can include various embodiments and the like not described herein, and within the scope not departing from the technical idea specified by the claims. Various design changes and the like can be made.

It is a perspective view which shows the structure of the compression wooden product which concerns on one embodiment of this invention. It is a disassembled perspective view which shows the structure of the compression wooden product which concerns on one embodiment of this invention. It is the sectional view on the AA line of FIG. It is a partial expansion perspective view which shows the structure of the protrusion part provided in an inner member. It is explanatory drawing which shows typically the condition which shapes wood from the solid material of an uncompressed state. It is explanatory drawing which shows the outline | summary of the primary compression process in the manufacturing method of the compression wooden product which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of the wood compression in a primary compression process. It is explanatory drawing which shows the outline | summary of the secondary compression process in the manufacturing method of the compression wooden product which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows the outline | summary of the secondary compression process in the manufacturing method of the compression wooden product which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of the wood compression in a secondary compression process. It is a perspective view which shows the external appearance structure of the digital camera which applied the compressed wood product which concerns on one embodiment of this invention as an exterior material. It is a perspective view which shows the structure of the compression wooden product which concerns on one embodiment of this invention. It is the EE sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressed wood product 2, 3 Cover member 2a, 3a, 11a, 12a Main board part 2b, 2c, 3b, 3c, 11b, 11c, 12b, 12c Side board part 4 Imaging part 5 Flash 6 Display part 7 Shutter button 11, 211, 311 External material 12, 212, 312 Inner member 21, 22, 31, 41, 42 Opening 50 Solid material 51, 52, 53 Wood 61, 71, 81, 91 Mold 62, 82 Convex 72, 92 Concave 100 Digital camera 121 Protrusion

Claims (7)

An outer member made of wood compressed into a predetermined shape;
A plurality of projecting portions project from an outer surface having substantially the same shape as the inner surface of the outer member, and an inner member made of a material having higher strength than the outer member;
With
The compressed wood product, wherein the plurality of protrusions are pushed into the outer member by external pressure, and an inner surface of the outer member and an outer surface of the inner member are in close contact with each other.   The compressed wood product according to claim 1, wherein the inner member includes at least one of a metal and a thermoplastic resin.   The compressed wood product according to claim 1 or 2, wherein a height at which the protruding portion protrudes from an outer surface of the inner member is smaller than a thickness of the outer member.   The compressed wood product according to any one of claims 1 to 3, wherein the compressed wood product is an exterior material for packaging an electronic device. A method for producing a compressed wood product comprising compressed wood,
A primary compression step of compressing an outer member made of wood into a predetermined shape;
An outer surface having a shape corresponding to an inner surface of the outer member compressed in the primary compression step, a plurality of projecting portions projecting from the outer surface, and the inner member made of a material having a higher strength than the outer member; A secondary compression step of overlapping the outer material and compressing the outer member and the inner member together,
A method for producing a compressed wood product, comprising: The primary compression step includes
6. The method of manufacturing a compressed wood product according to claim 5, wherein the outer member is compressed until the thickness of the outer member becomes substantially the same as the thickness of the outer member after the secondary compression step. The method for producing a compressed wood product according to claim 5 or 6, wherein the shape of the inner member is substantially the same before and after the secondary compression step.

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