JP7362043B2 - Fittings and fitting manufacturing methods - Google Patents

Description

The present invention relates to fittings and a method for manufacturing fittings.

Doors are used for entrances and exits of buildings or for openings of storage furniture. For example, Patent Document 1 discloses a door fitting with a mirror.

Utility Model Publication No. 62-000687

By the way, when the core material of the fittings is made of wood, it easily absorbs moisture and warps easily. Furthermore, if the core material is made of metal or resin, there is a concern that it may warp due to force from an unintended direction. Warping of the core material causes warping of fittings. Additionally, there is a need for lighter weight fittings to reduce the burden of transportation and construction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fitting that can reduce the warpage of the core material and reduce the weight, and a method of manufacturing the fitting.

The fitting of the first aspect includes a flat plate-shaped core material having a first surface and a second surface facing each other, a first resin layer that is a foam disposed on the first surface side of the core material, and a first A laminate including a first plate-shaped body having a design and a brittle body disposed on the opposite side of the resin layer from the core material.

The fitting of the second aspect includes a flat plate-shaped core material having a first surface and a second surface facing each other, a first resin layer that is a foam disposed on the first surface side of the core material, and a first A brittle first plate-shaped body having a design property placed on the opposite side of the resin layer from the core material, and a second resin layer which is a foam body placed on the second side of the core material. , a laminate including a second plate-shaped body having a design and a brittle plate disposed on the opposite surface to the surface on which the core material of the second resin layer is disposed.

The method for manufacturing fittings according to the third aspect includes: a core material having a flat plate shape having a first surface and a second surface facing each other; and a first resin layer which is a foam material and disposed on the side of the first surface of the core material. and a brittle first plate-shaped body having a design property disposed on the opposite side of the first resin layer from the core material, the core material is cut, and the first resin layer is This involves cutting a portion of the core side of the layer.

According to the present invention, the warpage of the core material can be alleviated and the weight can be reduced.

FIG. 1 is a schematic sectional view showing a part of a door structure of a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a part of a door structure according to a second embodiment of the present invention. FIG. 3 is a perspective view of a door structure according to a third embodiment of the present invention. FIG. 4 is a schematic sectional view showing a part of the door structure shown in FIG. 3. FIG. 5 is a schematic sectional view showing a part of a door structure according to another form of the third embodiment. FIG. 6 is an explanatory diagram showing one step in one embodiment of the method for manufacturing a door structure according to the present invention. FIG. 7 is an explanatory diagram showing one step of the door structure manufacturing method. FIG. 8 is an explanatory diagram showing one step of the door structure manufacturing method. FIG. 9 is an explanatory diagram showing one step of the door structure manufacturing method. FIG. 10 shows a test method for calculating the amount of warpage H ₀ . FIG. 11 shows a test method for calculating the amount of warpage _H1 . FIG. 12 shows a test method for calculating the amount of warpage _H1 .

Embodiments of the present invention will be described below with reference to the accompanying drawings. The invention is illustrated by the following embodiments. However, modifications may be made in many ways and other embodiments may be utilized without departing from the scope of the invention. Accordingly, all modifications within the scope of the invention are included in the claims. Here, parts indicated by the same symbols in the figures are basically similar elements having similar functions.

<First embodiment>
The fittings of the first embodiment will be described with reference to the drawings. Examples of fittings include door structures, whiteboards, screens, table tops, and counterboards. Furthermore, examples of fittings include panels, side panels, and shelf boards used in entrance storage, closets, cupboards, television boards, washstands, toilets, kitchens, and the like. Examples of door structures include interior door doors, entrance storage doors, closets, cupboards, TV boards, vanities, mirror doors, and storage doors used in bathrooms, kitchens, and the like. In the following first to third embodiments, cases in which the present invention is applied to a door structure will be described. FIG. 1 is a schematic cross-sectional view showing a door structure 10 of the first embodiment. As shown in FIG. 1, the door structure 10 includes a laminate 17 including a core material 12, a resin layer 14, and a plate-like body 16.

The core material 12 has a flat plate shape with a first surface 12A and a second surface 12B facing each other. It should be noted that which of the two opposing main surfaces of the core material 12 should be the first surface 12A and which should be the second surface 12B can be arbitrarily determined.

The first resin layer 14 is a foamed resin layer, and is arranged on the first surface 12A side of the core material 12. The plate-like body 16 is a brittle first plate-like body having a design property, and is arranged on the surface of the resin layer 14 on the opposite side to the core material 12 . The core material 12 and the plate-shaped body 16 are arranged at opposing positions with the resin layer 14 in between. A design layer 18 is arranged between the plate-like body 16 and the resin layer 14.

In the first embodiment, the design of the plate-like body 16 is imparted by the design layer 18 interposed between the plate-like body and the resin layer. The design of the plate-shaped body 16 may be achieved by the plate-shaped body itself having a pattern, color, or the like. The design layer 18 interposed between the plate-like body 16 and the resin layer 14 has the form of a design layer formed directly on the surface of the plate-like body 16 and a design layer formed directly on the surface of the resin layer 14. Also included.

Since the door structure 10 is provided with the design layer 18, the door structure 10 can create a high-class beauty when used for the entrance of a building or the opening of storage furniture.

The overall thickness of the door structure 10 of the first embodiment is preferably 7 mm or more and 21 mm or less. The overall thickness of the door structure 10 of the first embodiment is more preferably 10 mm or more, and even more preferably 15 mm or more. The overall thickness of the door structure 10 of the first embodiment is more preferably 20 mm or less, even more preferably 19 mm or less, and particularly preferably 18 mm or less.

In the door structure 10 of the first embodiment, it is preferable that the entire first surface 12A of the core material 12 is covered with the resin layer 14 and the plate-like body 16, but a portion of the first surface 12A of the core material 12 is may be covered with the resin layer 14 and the plate-like body 16. Of the area of the first surface 12A of the core material 12, the ratio of the area covered by the resin layer 14 and the plate-shaped body 16 is preferably 80% or more, more preferably 90% or more, and still more preferably 95% or more. preferable. Of the area of the first surface 12A of the core material 12, the ratio of the area covered by the resin layer 14 and the plate-shaped body 16 may be 100% or less, or may be 97% or less.

The area of the door structure 10 of the first embodiment is preferably 0.01 m ² or more, more preferably 0.1 m ² or more, even more preferably 0.5 m ² or more, particularly preferably 1 m ² or more, and 2.5 m ² or more. is most preferred. The large area of the door structure 10 makes it easy to warp and makes it heavy, but by having the resin layer 14, the warp is alleviated and the door structure can be made lighter. Further, the area of the door structure 10 of the first embodiment may be 5 m ² or less, 4 m ² or less, 3.5 m ² or less, or 3 m ² or less. good.

The area of the portion of the first surface 12A of the core material 12 covered by the resin layer 14 and the plate-shaped body 16 is preferably 0.01 m ² or more, more preferably 0.1 m ² or more, and 0.5 m 2 or more. It is more preferably ² or more, particularly preferably 1 m ² or more, and most preferably 2.5 m ² or more. Further, the area of the portion of the first surface 12A of the core material 12 covered by the resin layer 14 and the plate-like body 16 may be 5 m ² or less, or may be 4 m ² or less, It may be 3.5 m ² or less, or it may be 3 m ² or less.

The materials constituting the door structure 10 will be described below.

<Core material>
The core material 12 is a member used as a core of the door structure 10. The core material 12 has a flat plate shape and has a first surface 12A and a second surface 12B that face each other. The flat plate shape is a shape that has two main surfaces that are large in area relative to the thickness.

Since the core material 12 is a member used as a core of the door structure 10, it is preferable that it has rigidity. The core material 12 may be made of wood, metal, resin, or a composite thereof. The material can be selected as appropriate depending on the characteristics required for the door structure 10.

In the case of the wooden core material 12, for example, materials such as wood fiberboard such as medium density fiberboard (MDF), plywood, particle board, etc. can be appropriately used as the core material 12. Medium density fiberboard is defined in JIS A 5905. Plywood is constructed by laminating multiple veneers. Particle board is manufactured by heating and compressing small pieces of wood using an adhesive, and is specified in JIS A 5908.

In the case of the wooden core material 12, for example, a so-called solid structure (solid core structure) such as wood fiberboard, plywood, particle board, etc., and a flash structure board can be used as the structure. A flash structural board is a hollow structure made of a wooden frame with plywood, etc. pasted on both sides. Density can be reduced compared to solid structures.

The density of the wooden core material 12 is preferably 400 kg/m ³ or more and 900 kg/m ³ or less. If the density of the core material 12 is 400 kg/m ³ or more, the strength of the core material 12 can be ensured. If the density of the core material 12 is 900 kg/m ³ or less, the weight of the door structure 10 can be reduced. The density of the wooden core material 12 is more preferably 500 kg/m ³ or more and 800 kg/m ³ or less. Further, the specific gravity of the core material 12 is preferably 0.4 or more and 0.9 or less, more preferably 0.5 or more and 0.8 or less.

In the case of the core material 12 made of metal, for example, a metal material such as aluminum or iron can be appropriately used as the core material 12.
In the case of the core material 12 made of resin, materials such as acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), polyvinyl chloride resin (PVC resin), or acrylic resin can be used as the core material 12, for example. .

The thickness of the core material 12 is appropriately selected depending on the thickness of the door structure 10. The thickness of the core material 12 is preferably 1 mm or more and 25 mm or less. The thickness of the core material 12 is more preferably 2 mm or more, further preferably 5 mm or more, and particularly preferably 10 mm or more. Further, the thickness of the core material 12 is more preferably 20 mm or less, and even more preferably 16 mm or less.

<Plate body>
The effects of the present invention can be enjoyed as long as the plate-shaped body 16 is made of a brittle material. Brittleness refers to the property of being susceptible to breaking when subjected to force. For example, the material of the plate-like body 16 may be a glass plate, a resin plate, or a ceramic plate. The resin plate is preferably a brittle resin plate. Examples of the brittle resin board include a melamine resin board, an acrylic resin board, a polycarbonate resin board, and a vinyl chloride board. Examples of the ceramic board include ceramic members such as tiles. The plate-like body may be made of stone. Below, the case where the plate-shaped body 16 is a glass plate is demonstrated.

The glass plate applied to the plate-shaped body 16 is not particularly limited in terms of the type of glass. Examples include soda lime glass, alkali-free glass, and aluminosilicate glass. When chemically strengthening treatment is performed, aluminosilicate glass containing 3% or more of Al ₂ O ₃ in mass % based on oxides is preferable.

The thickness of the glass plate is preferably 0.5 mm or more and 5 mm or less. When the thickness of the glass plate is 0.5 mm or more, warping of the core material 12 can be absorbed. If the glass plate is 5 mm or less, the entire door structure 10 will not be heavy, making transportation and construction easier. The thickness of the glass plate is more preferably 1 mm or more, and even more preferably 1.5 mm or more. Further, the thickness of the glass plate is more preferably 4 mm or less, and even more preferably 3 mm or less.

When the plate-shaped body 16 is a glass plate, the density of the glass plate is preferably 2300 kg/m ³ or more and 2800 kg/m ³ or less, more preferably 2400 kg/m ³ or more and 2600 kg/m ³ or less. The specific gravity of the plate-shaped body 16 is preferably 2.3 or more and 2.8 or less, and preferably 2.4 or more and 2.6 or less.

It is preferable that the glass plate applied to the plate-shaped body 16 be in close contact with the design layer 18. Due to the close contact, when the design layer 18 is viewed through the plate-like body 16, the door structure 10 has an increased sense of depth and luxury, and is aesthetically superior. Further, the visible light transmittance of the glass plate based on the standard A light source (determined according to JIS R 3106) is preferably 60% or more for aesthetic reasons, and more preferably 70% or more. The upper limit of the visible light transmittance of the glass plate based on the standard A light source is not particularly limited, but may be 100% or less, 92% or less, or 90% or less.

Note that, in order to provide a texture on the surface of the glass plate, the surface may be textured by post-processing such as frosting.

A glass plate can be manufactured by a known method. That is, a glass plate is manufactured by cutting glass formed into a ribbon shape by a float method, a fusion method, a down-draw method, a roll-out method, or the like.

The glass plate may have a compressive stress layer on the surface layer. When a glass plate is subjected to a strengthening treatment, the glass plate becomes a tempered glass plate. A tempered glass plate that has been subjected to a strengthening treatment is less likely to break than a glass plate that has not been subjected to a strengthening treatment. The tempered glass plate includes a compressive stress layer on the surface layer, that is, a surface layer and a back layer that have residual compressive stress, and an intermediate layer that is formed between the front layer and the back layer and has residual tensile stress. The residual compressive stress becomes smaller as it goes inward from both ends in the thickness direction of the tempered glass plate, and residual tensile stress is generated inside the tempered glass plate.

The end surface of the tempered glass plate may be continuously covered with residual compressive stress in the front layer and the back layer. It is preferable that the end face of the tempered glass plate be covered with residual compressive stress, as this makes it difficult to break due to impact. Note that the end face of the tempered glass plate may not be covered with residual compressive stress, and the end face of the intermediate layer may be exposed on the end face of the tempered glass plate. In that case, it is preferably covered with a cover material such as resin.

A tempered glass plate is produced by applying a strengthening treatment to generate residual compressive stress on the front and back surfaces of the glass plate. The tempered glass plate may be either a chemically strengthened glass obtained by a chemical strengthening process such as an ion exchange method or a physically strengthened glass obtained by a physical strengthening process such as an air-cooling strengthening process. Chemical strengthening treatment can increase the residual compressive stress in the front and back layers even for thinner glass plates. For example, the value of residual compressive stress in the surface layer is preferably 300 MPa or more, more preferably 400 MPa or more. The upper limit of the residual compressive stress in the surface layer is not particularly limited, but may be 1200 MPa or less, 800 MPa or less, or 600 MPa or less. In the case of chemically strengthened glass, the thickness of the compressive stress layer may be 50 μm or less, or 40 μm or less. Further, the thickness of the compressive stress layer may be 10 μm or more, or 20 μm or more.

In the ion exchange method, ions are exchanged on the front and back surfaces of a glass plate to replace ions with a small ionic radius (for example, Li ions and Na ions) contained in the glass with ions with a large ionic radius (for example, K ions). Thereby, residual compressive stress can be generated on the front and back surfaces of the glass plate. In the ion exchange method, ion exchange is performed by immersing a glass plate in a high-temperature treatment solution.

The air-cooling strengthening method rapidly cools a glass plate at a temperature near its softening point from both sides, creating a temperature difference between the front and back surfaces of the glass plate and the inside of the glass plate. Residual compressive stress can be created. Physical strengthening methods such as air-cooling strengthening methods require several seconds to several tens of seconds for the strengthening process, and therefore have much better productivity than chemical strengthening methods such as ion exchange methods.

The plate-like body 16 may have a functional layer on the surface opposite to the resin layer 14 to add a special function. Examples of the functional layer include an antifouling film, an antibacterial film, and an antifogging film.

The antifouling film has the effect of reducing the adhesion of fingerprints and making it difficult for dirt to adhere. In particular, if the door structure 10 is directly touched by hand, fingerprints will adhere to the surface of the plate-like body 16 and the design will be impaired, so it is preferable to have an AFP (Anti-Finger Print) function to reduce the adhesion of fingerprints. The AFP function attaches an AFP agent to the plate-like body 16 to form an AFP film on the glass plate. Examples of AFP agents include fluorine-containing organosilicon compounds. The fluorine-containing organosilicon compound is not particularly limited and can be used as long as it imparts stain resistance, water repellency, and oil repellency. The molecular weight of the AFP agent is preferably 3,000 or more and 10,000 or less, more preferably 3,000 or more and 8,000 or less, and even more preferably 3,000 or more and 6,000 or less. When the molecular weight of the AFP agent is 3,000 or more, flexibility is imparted to the molecular structure, and scratch resistance and surface slipperiness can be obtained. Furthermore, by setting the number to 10,000 or less, a sufficient number of reactive groups per molecule of the AFP agent can be ensured, and adhesion to the surface of the plate-shaped body 16 can be ensured.

The antibacterial film is formed by attaching an antibacterial agent that exhibits antibacterial properties to the plate-like body 16. Examples of antibacterial agents include natural antibacterial agents such as wasabi, metal antibacterial agents such as copper and silver, and oxide antibacterial agents such as titanium oxide. In particular, by applying a solution containing silver to the plate-like body 16 to form a silver film, and heat-treating the plate-like body on which the silver film has been formed, silver ions are diffused from the surface of the plate-like body 16 into the interior. It is preferable to do so from the viewpoint of sustainability of the effect.

The anti-fog film prevents the surface of the plate-like body 16 from becoming foggy by providing a water-absorbing resin layer on the surface of the plate-like body 16 and absorbing and removing minute water droplets formed on the surface of the plate-like body 16. It has the effect of preventing this and maintaining the design. The antifogging film includes, for example, a base layer and a water absorption layer. The base layer is a layer that makes it difficult for the water absorption layer to peel off from the glass plate, and can be obtained, for example, by applying a composition containing a silane coupling agent to the plate-like body 16 and reacting it. The water-absorbing layer is obtained by applying a composition containing a raw material component of a cured resin selected from cured epoxy resins, urethane resins, and crosslinked acrylic resins onto the base layer and reacting the composition.

It is preferable that the Young's modulus of the plate-shaped body 16 is 5 GPa or more. If the Young's modulus of the plate-shaped body 16 is 5 GPa or more, it is difficult to warp. The Young's modulus of the plate-shaped body 16 is more preferably 10 GPa or more, further preferably 30 GPa or more, and particularly preferably 50 GPa or more. The upper limit of the Young's modulus of the plate-shaped body 16 is not particularly limited, but may be 100 GPa or less.

<Design layer>
A design layer 18 is formed between the plate-shaped body 16 and the resin layer 14. The design layer 18 is formed, for example, by applying a paint containing a colored pigment to the surface of a glass plate, which is the plate-shaped body 16, and drying and curing the paint. Examples of the paint include acrylic resin paints. Acrylic resin paints have strong adhesion and excellent weather resistance and corrosion resistance. It is also preferable because of its beautiful finish. Note that the design layer 18 is not particularly limited as long as it can impart design properties; for example, it may be a melamine resin paint or an epoxy resin paint, and the colored pigments may also be of various colors. Further, the design layer 18 may be a mirror coated with a metal film.

The method for applying the paint is not particularly limited, but for example, a roll coating method, a spray coating method, a dip coating method, a flow coating method, a screen printing method, a spin coating method, etc. are used.

Further, instead of using paint, the design layer 18 formed into a sheet may be adhered to the glass plate that is the plate-like body 16 using an adhesive or the like. In that case, the design layer 18 formed into a sheet shape may be of a single color or a plurality of colors, or may have a natural stone-like pattern, a brick-like pattern, or the like. Further, the design layer 18 may be provided with a design by, for example, a patterned glass provided with a pattern such as unevenness on the surface of the plate-shaped body 16.

<Resin layer>
The resin layer 14 is composed of a resin layer that is a foam containing a skeleton resin that defines air bubbles (cells). When the resin layer 14, which is a foam, is manufactured by a chemical crosslinking method, a crosslinking agent is added to the skeleton resin, and a crosslinking reaction by the crosslinking agent and a decomposition reaction of the blowing agent are caused to cause gas components to remain, thereby forming bubbles. (cells) are defined and a resin layer 14 having predetermined foaming properties can be obtained.

The type of skeleton resin and the manufacturing method are not limited as long as predetermined foaming characteristics can be obtained. As the skeleton resin, synthetic resins, synthetic rubbers, etc. can be used, such as polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-propylene-diene rubber (EPDM), silicone, polyurethane, etc. can be used.

Preferably, the cells defined by the framework resin are closed cells. Closed cell means a structure in which cells are arranged independently. By forming a closed cell structure, the physical strength of the resin layer 14 can be improved compared to an open cell structure.

The skeleton resin of the resin layer 14 preferably contains a flame retardant. Ignition of the resin layer 14 is suppressed by the flame retardant.

As flame retardants, organic flame retardants and inorganic flame retardants can be added to the skeleton resin alone or in combination. As the organic flame retardant, brominated aromatic compounds such as phosphorus compounds can be used. Moreover, magnesium hydroxide, aluminum hydroxide, etc. can be used as an inorganic flame retardant. The mass ratio of the flame retardant to the skeleton resin (flame retardant/skeleton resin) contained in the resin layer 14 is preferably 20% or more, more preferably 27% or more, and even more preferably 30% or more. It is preferably 50% or more, particularly preferably 70% or more, and most preferably 70% or more. The upper limit of the mass ratio of the flame retardant to the skeleton resin (flame retardant/skeleton resin) contained in the resin layer 14 is not particularly limited, but may be 100% or less, 80% or less, or 70% or less. It may be.

The thickness of the resin layer 14 is preferably 1 mm or more and 10 mm or less. When the thickness of the resin layer 14 is 1 mm or more, the warpage of the core material 12 can be absorbed, and sufficient impact resistance can be obtained when laminated with the plate-shaped body 16. The thickness of the resin layer 14 is more preferably 2 mm or more, and even more preferably 3 mm or more.

When the thickness of the resin layer 14 is 10 mm or less, deformation of the resin layer 14 due to the load of the plate-shaped body 16 is suppressed, and the shape of the door structure 10 is difficult to change. The thickness of the resin layer 14 is more preferably 7 mm or less, and even more preferably 5 mm or less.

The density of the resin layer 14 is preferably 30 kg/m ³ or more and 160 kg/m ³ or less. If the density of the resin layer 14 is 30 kg/m ³ or more, sufficient impact strength can be obtained when laminated with the plate-shaped body 16. The density of the resin layer 14 is more preferably 70 kg/m ³ or more. If the density of the resin layer 14 is 160 kg/m ³ or less, the weight of the door structure 10 can be reduced. The density of the resin layer 14 is more preferably 120 kg/m ³ or less, even more preferably 100 kg/m ³ or less, and particularly preferably 80 kg/m ³ or less. The specific gravity of the resin layer 14 is preferably 0.03 or more and 0.16 or less.

The Shore A hardness of the resin layer 14 is preferably 10 or more and 60 or less. Note that the Shore A hardness is based on the measured value of a durometer (Asker Rubber Hardness Meter Type A manufactured by Asker Corporation). An indenter (indentation needle) is pressed onto the surface of the object to be measured to deform it, the amount of deformation (indentation depth) is measured, and the average value of at least four locations is taken. If the resin layer 14 is thin and soft, the resin layers are overlapped and measured so that the thickness is 6 to 12 mm. If the Shore A hardness is 10 or more, the resin layer 3 has sufficient rigidity and thus has good workability, and the resin layer 3 is hard to deform, so the plate-like body 16 is hard to deform and crack. Shore A hardness is more preferably 20 or more, still more preferably 30 or more. Further, if the Shore A hardness is 60 or less, the plate-shaped body 16 will not easily break even if it receives a strong impact because it has sufficient impact absorption properties. Shore A hardness is more preferably 50 or less.

The resin layer 14 may contain other components. Other components may include, for example, pigments, inorganic additives, and the like. Various functions can be imparted to the resin layer 14. The presence or absence of a flame retardant or the like in the resin layer 14 can be measured, for example, by IR (infrared spectroscopy), TGA (thermogravimetric analysis), DSC (differential scanning calorimetry), or the like.

The resin layer 14 may be a plate-shaped member, or may be integrally formed with the plate-shaped body 16 by injection molding or extrusion molding. When the resin layer 14 is a plate-shaped member, the plate-shaped body 16 and the plate-shaped resin layer 14 are bonded with adhesive or adhesive so that the design layer 18 is interposed between the plate-shaped body 16 and the resin layer 14. It is preferable that the adhesive be attached with an adhesive (hereinafter referred to as a plate-like adhesive including an adhesive) or the like.

The adhesive for the plate-shaped body may be applied to the entire surface of the resin layer 14, or may be applied to only a part of the resin layer 14. It is advantageous to apply the adhesive to the entire surface because the plate-like body 16 is less likely to break. Further, an adhesive may be applied to the design layer 18 of the plate-shaped body 16. As the adhesive, general construction sealants can be used, such as modified silicone sealants, acrylic adhesives, synthetic rubber adhesives, and the like. The adhesive may be in the form of a sheet such as double-sided tape. Further, it is preferable for the adhesive to be used as a building material by selecting the material and the amount of application so as to have high nonflammability.
The adhesion area between the plate-shaped body 16 and the plate-shaped resin layer 14 is preferably 10% or more of the area of the plate-shaped body, more preferably 50% or more, even more preferably 90% or more, and particularly preferably 100%. The upper limit of the bonding area between the plate-shaped body 16 and the plate-shaped resin layer 14 is not particularly limited, but may be 100% or less of the area of the plate-shaped body.

When the resin layer 14 and the plate-like body 16 are integrally molded, the plate-like body 16 on which the design layer 18 is formed is placed in a mold, and resin is injected onto the design layer 18 to form an integral mold. In the case of extrusion molding, resin is supplied from an extrusion die onto the design layer 18 of the plate-shaped body 16 and is cured to be integrally molded. Note that, if necessary, the resin layer 14 may be integrally molded after applying an adhesive or an undercoat (primer), such as a silane coupling agent, to the side of the plate-shaped body 16.

It is preferable that the resin layer 14 and the core material 12 are bonded together via an adhesive (referred to as a core material adhesive). As the adhesive for the core material, acrylic adhesive type, synthetic rubber type, silicone type, and modified silicone type can be used. Double-sided tape may be used as the acrylic adhesive.

Since the door structure 10 of the first embodiment has the resin layer 14 between the plate-like body 16 and the core material 12, it has the following advantages.

If the core material 12 is made of wood, for example, it absorbs moisture and becomes easily warped. If the core material 12 is made of metal, for example, it is likely to warp due to unintended force. However, by deforming the resin layer 14 of the door structure 10, the warpage of the core material 12 can be alleviated. Thereby, the flatness of the plate-like body 16 can be realized, so that the design of the plate-like body 16 can be ensured.

As shown in the examples described later, when the amount of warpage when the core material 12 is a single piece is _H0 , and the amount of warpage of the laminate 17 is _H1 , the following equation can be satisfied.

((H ₀ - H ₁ )/H ₀ )×100≧5%
The right side of the above formula is preferably 10%, more preferably 15%, and even more preferably 20%.

The specific gravity of the resin layer 14 is smaller than the specific gravity of the core material 12 and the plate-shaped body 16. Compared to the door structure 10 where the thickness of the door structure 10 is constant and is composed only of the core material 12 and the plate-like body 16, the door structure 10 is made by using the resin layer 14 as part of the core material 12 and the plate-like body 16. Since the overall specific gravity of the structure 10 can be reduced, the weight of the door structure 10 can be reduced as shown in the embodiments described below.

The specific gravity of the door structure 10 is preferably 1.8 or less. If the specific gravity of the door structure 10 is 1.8 or less, the weight of the door structure 10 can be reduced. The specific gravity of the door structure 10 is more preferably 1.5 or less, further preferably 1.2 or less, particularly preferably 1.0 or less, and most preferably 0.9 or less.

The door structure 10 of the first embodiment is preferably used for an opening door of storage furniture.

<Second embodiment>
An example of fittings according to the second embodiment will be described with reference to the drawings. FIG. 2 is a schematic cross-sectional view showing a door structure 20 as an example of the second embodiment. As shown in FIG. 2, the door structure 20 is a laminate including a core material 22, a first resin layer 24, a first plate-like body 26, a second resin layer 30, and a second plate-like body 32. A body 33 is provided.

The core material 22 has a flat plate shape with a first surface 22A and a second surface 22B facing each other. It should be noted that which of the two opposing main surfaces of the core material 22 is to be the first surface 22A and which is the second surface 22B can be arbitrarily determined.

The first resin layer 24 is a foamed resin layer, and is disposed on the first surface 22A side of the core material 22. The first plate-like body 26 is a brittle plate-like body having a design property, and is arranged on the surface of the first resin layer 24 opposite to the core material 22 . The core material 22 and the first plate-like body 26 are arranged at opposing positions with the first resin layer 24 interposed therebetween. A first design layer 28 is arranged between the first plate-like body 26 and the first resin layer 24.

The second resin layer 30 is a foamed resin layer, and is arranged on the second surface 22B side of the core material 22. The second plate-like body 32 is a brittle plate-like body having a design property, and is arranged on the surface of the second resin layer 30 opposite to the core material 22 . The core material 22 and the second plate-like body 32 are arranged at opposing positions with the second resin layer 30 interposed therebetween. A second design layer 34 is arranged between the second plate-like body 32 and the second resin layer 30.

Since the door structure 20 includes the first design layer 28 and the second design layer 34, the door structure 20 can create a high-class aesthetic appearance when used as an entrance/exit of a building.

The overall thickness of the door structure 20 of the second embodiment is preferably 15 mm or more and 50 mm or less. The overall thickness of the door structure 20 of the second embodiment is more preferably 20 mm or more, even more preferably 25 mm or more, and particularly preferably 30 mm or more. Moreover, as for the whole thickness of the door structure 20 of 2nd Embodiment, 45 mm or less is more preferable, and its 40 mm or less is more preferable.

In the door structure 20 of the second embodiment, it is preferable that the entire first surface 22A and second surface 22B of the core material 22 are covered with a resin layer and a plate-shaped body. 22A and a portion of the second surface 22B may be covered with a resin layer and a plate-like body. Of the areas of the first surface 22A and the second surface 22B of the core material 22, the ratio of the area covered by the resin layer and the plate-shaped body is preferably 80% or more, more preferably 90% or more, and 95%. The above is more preferable. Of the areas of the first surface 22A and the second surface 22B of the core material 22, the ratio of the area covered by the resin layer and the plate-shaped body may be 100% or less, and may be 97% or less. Good too.

The area of the door structure 20 of the second embodiment is preferably 0.01 m ² or more, more preferably 0.1 m ² or more, even more preferably 0.5 m ² or more, particularly preferably 1 m ² or more, and 2.5 m ² or more. is most preferred. Although the large area of the door structure 20 causes it to warp easily and make it heavy, the presence of the resin layer alleviates the warpage and makes it lighter. Further, the area of the door structure 20 of the second embodiment may be 5 m ² or less, 4 m ² or less, 3.5 m ² or less, or 3 m ² or less. good.

The area of the portion of the first surface 22A of the core material 22 covered by the resin layer and the plate-like body, and the area of the portion of the second surface 22B of the core material 22 covered by the resin layer and the plate-like material. The area is preferably 0.01 m ² or more, more preferably 0.1 m ² or more, even more preferably 0.5 m ² or more, particularly preferably 1 m ^{2 or} more, and most preferably 2.5 m ² or more. In addition, the area of the first surface 22A of the core material 22 covered by the resin layer and the plate-shaped body and the area of the second surface 22B of the core material 22 covered by the resin layer and the plate-shaped body The area of the part may be 5 m ² or less, 4 m ² or less, 3.5 m ² or less, 3 m ² or less.

The materials constituting the door structure 20 will be described below. Note that the description of configurations similar to those in the first embodiment may be omitted.

<Core material>
The core material 22 is a member used as a core of the door structure 20. The core material 22 has a flat plate shape and has a first surface 22A and a second surface 22B that face each other.

As the core material 22, the same material and structure as the core material 12 of the first embodiment can be applied. In the second embodiment, it is preferable to use a thicker core material 22 than in the first embodiment from the viewpoint of increasing the rigidity of the laminate.

<Plate body>
As the first plate-like body 26 and the second plate-like body 32, the same plate-like body as the plate-like body 16 of the first embodiment can be applied. In the door structure 20 of the second embodiment, the first plate-like body 26 and the second plate-like body 32 can be made of the same material or different materials, and can have the same thickness or different thicknesses.

<Design layer>
As the first design layer 28 and the second design layer 34, the same design layer as the design layer 18 of the first embodiment can be applied. In the door structure 20 of the second embodiment, the first design layer 28 and the second design layer 34 can be the same design layer or different design layers.

The same or different aesthetic appearance can be provided on the first surface 22A side and the second surface 22B side of the core material 22 of the door structure 20.

<Resin layer>
As the first resin layer 24 and the second resin layer 30, the same resin layer as the resin layer 14 of the first embodiment can be applied. In the door structure 20 of the second embodiment, the first resin layer 24 and the second resin layer 30 can be made of the same material or different materials, and can have the same thickness or different thicknesses.

The door structure 20 of the second embodiment has a first resin layer 24 between the first plate-like body 26 and the core material 22, and a second resin layer 30 between the second plate-like body 32 and the core material 22. It has the following advantages.

If the core material 22 is made of wood, for example, it absorbs moisture and tends to warp. If the core material 22 is made of metal, for example, it is likely to warp due to unintended force. However, by deforming the first resin layer 24 and the second resin layer 30 of the door structure 20, the warpage of the core material 22 can be alleviated. Thereby, the flatness of the first plate-like body 26 and the second plate-like body 32 can be realized, so that the design of the first plate-like body 26 and the second plate-like body 32 can be ensured.

When the amount of warpage when the core material 22 is a single piece is _H0 , and the amount of warpage of the laminate 33 is _H1 , the following equation can be satisfied.

((H ₀ - H ₁ )/H ₀ )×100≧5%
The specific gravity of the first resin layer 24 and the second resin layer 30 is smaller than the specific gravity of the core material 22, the first plate-like body 26, and the second plate-like body 32. Compared to the door structure 20 where the thickness of the door structure 20 is constant and is composed only of the core material 22, the first plate-like body 26, and the second plate-like body 32, the thickness of the core material 22, the first plate-like body 26, and By forming part of the second plate-like body 32 into the first resin layer 24 and the second resin layer 30, the overall specific gravity of the door structure 20 can be reduced, so that the door structure 20 can be can be made lighter.

The specific gravity of the door structure 20 is preferably 1.8 or less. If the specific gravity of the door structure 20 is 1.8 or less, the weight of the door structure 20 can be reduced. The specific gravity of the door structure 20 is more preferably 1.5 or less, further preferably 1.2 or less, particularly preferably 1.0 or less, and most preferably 0.9 or less.

The door structure 20 of the second embodiment is preferably used for an entrance/exit door of a building.

<Third embodiment>
The fittings of the third embodiment will be described with reference to the drawings. The door structure of the third embodiment includes a molding material on the end face of the laminate. The door structure of the third embodiment can improve the strength and design of the end surface of the door structure.

FIG. 3 is a perspective view of the door structure 10 of the third embodiment. As shown in FIG. 3, the door structure 10 includes a laminate 17 including a core material 12, a resin layer 14, and a plate-like body 16. The laminate 17 has four end faces 17A. The door structure 10 includes a molding material 60 that covers the end surface 17A of the laminate 17. Although FIG. 3 shows only one molding material 60 covering the end surface 17A, the molding material 60 basically covers all the end surfaces 17A.

The molding material 60 is made of, for example, a material selected from the group consisting of acrylonitrile-butadiene-styrene copolymer synthetic resin, acrylic resin, and polyethylene terephthalate resin. By covering the end surface 17A of the laminate 17 with the molding material 60, the molding material 60 protects the end surface 17A. The molding material 60 suppresses damage such as cracks and chips from occurring on the end surface 17A.

FIG. 4 is a schematic cross-sectional view of a portion of the end surface 17A cut along a plane perpendicular to the main surface of the door structure 10 of FIG. As shown in FIG. 4, the end surface 17A of the laminate 17 and the molding material 60 are bonded with an adhesive 62. Adhesive 62 is preferably a hot melt adhesive. A hot-melt adhesive is an adhesive that is used by heating it to a specific temperature (100° C. to 250° C.) to melt it, for example. As the hot melt adhesive, ethylene vinyl acetate resin (EVA) adhesive, polyolefin resin adhesive, and polyurethane resin (PUR) adhesive can be used.

In the door structure 10 of the embodiment, the end surface 17A of the laminate 17 is configured to be flush with each other. Being flush means that the level difference between the end faces of the core material 12, the resin layer 14, and the plate-shaped body 16 that constitute the laminate 17 is within ±0.5 mm. Since the end surfaces 17A of the laminate 17 are flush, the adhesive 62 can be formed with a uniform thickness. Therefore, the adhesive strength between the end surface 17A and the molding material 60 can be improved.

In the door structure 10 of the embodiment, since the laminate 17 has the resin layer 14, the thickness of the plate-like body 16 can be made thinner than a single plate-like body without a resin layer. When the plate-like body 16 is a transparent thin glass plate, it becomes difficult for a person to visually recognize the adhesive 62 from the end surface of the plate-like body 16. Since the adhesive 62 is not visible, the design of the door structure 10 can be improved.

In addition, in the door structure 10 of the embodiment, since the laminate 17 has the resin layer 14, the adhesive strength between the end surface 17A of the laminate 17 and the molding material 60 is higher than that of a single plate-like body without a resin layer. can be improved. The adhesive strength between the adhesive 62 and the resin layer 14 is greater than the strength between the adhesive 62 and the plate-shaped body 16. Therefore, the presence of the resin layer 14 allows the molding material 60 and the resin layer 14 to be firmly adhered to each other by the adhesive 62, compared to a single plate-like body without a resin layer.

FIG. 5 is a schematic sectional view of a part of the door structure 20 according to another form of the third embodiment. The door structure 20 includes a laminate 33 including a core material 22 , a first resin layer 24 , a first plate-like body 26 , a second resin layer 30 , and a second plate-like body 32 . The end surface 33A of the laminate 33 and the molding material 60 are bonded together by an adhesive 62. The door structure 20 according to another form of the third embodiment has the same effects as the door structure 10 of the third embodiment.

<Method of manufacturing fittings>
Next, one embodiment of the method for manufacturing fittings according to the present invention will be described with reference to FIGS. 6 to 9. A method for manufacturing fittings according to this embodiment will be described with reference to the door structure 10 of the first embodiment and the third embodiment.

As shown in FIG. 6, the core material 12, the first resin layer 14, and the first plate-shaped body 16 are prepared. The resin layer 14 and the plate-like body 16 have approximately the same area. Therefore, the end surface of the resin layer 14 and the end surface of the plate-shaped body 16 are flush with each other. Here, the area is the area of the main surface of the resin layer 14 and the main surface of the plate-shaped body 16.

On the other hand, the area of the core material 12 is larger than the areas of the resin layer 14 and the plate-like body 16. Therefore, the core material 12 protrudes from the resin layer 14 and the plate-like body 16. The end face 17A of the laminate 17 is not configured to be flush with each other.

Next, as shown in FIG. 7, the cutting blade 70 cuts the core material 12 and part of the resin layer 14 along the end surface of the plate-shaped body 16. The cutting blade 70 completely cuts the core material 12. On the other hand, the cutting blade 70 cuts a part of the resin layer 14, leaving the resin layer 14 at a distance A from the plate-like body 16 side. Therefore, since the cutting blade 70 does not come into contact with the plate-like body 16, it is possible to protect the plate-like body 16 from damage caused by the cutting blade 70.

Next, as shown in FIG. 8, the protruding portions of the cut core material 12 are removed, and the end surfaces 17A of the laminate 17 are made flush. A door structure 10 in which the end surfaces 17A of the laminate 17 are flush is manufactured.

Unlike the embodiment, in a laminate made of a single plate-shaped body without a resin layer and a core material, it is difficult to cut only the core material. When preparing a laminate consisting of a plate-shaped body and a core material larger in area than the plate-shaped body and cutting the plate-shaped body along the end surface with a cutting blade, the following concerns arise. When cutting the core material completely, the cutting blade comes into contact with the plate-shaped body, which tends to damage the plate-shaped body and cause the plate-shaped body to easily break. On the other hand, even if the cutting blade is inserted into the core material without contacting the plate-shaped body, the core material is not cut, making it difficult to remove the protrusion of the core material from the plate-shaped body. If the protrusion is removed by applying excessive force to the core material, there is a concern that the end faces of the laminate will not be flush. In the embodiment, since the laminate 17 includes the resin layer 14, the above concerns can be resolved.

Next, as shown in FIG. 9, a molding material 60 is attached to the end surface 17A of the laminate 17 of the door structure 10. The molding material 60 is attached to the end surface 17A of the laminate 17 using, for example, an edge bander, and the door structure 10 shown in FIG. 3 is manufactured.

The edge pasting machine (not shown) includes, for example, a conveyance unit that conveys the door structure 10, a coating unit that applies hot melt adhesive to the end surface 17A, a pressing unit that attaches the molding material 60, and the like. While the door structure 10 is being transported to the transport unit, an adhesive is applied to the end surface 17A by a coating unit, and then a molding material 60 is attached to the end surface 17A by a pressing unit. In this way, the molding material 60 is attached to one end surface 17A of the laminate 17. Molding members 60 are similarly attached to the remaining three end faces 17A.

In the laminate 17 of the embodiment, the end surface 17A is made flush with the cutting blade 70. Therefore, it becomes possible to attach the molding material 60 using an edge pasting machine.

Unlike the embodiment, in the case of a laminate consisting of a single plate-shaped body without a resin layer and a core material, the end faces cannot be made flush as described above, so the molding material is attached using an edge pasting machine. was difficult. The door structure 10 of the embodiment allows for the use of a edging machine.

<Example>
The present invention will be specifically explained with reference to examples of door structures below, but the fittings of the present invention are not limited to these examples.

(Test 1)
Regarding the door structure of the first embodiment, a warpage absorption test was conducted to confirm the relaxation of warpage of the core material.

(Test specimen)
The test specimen was a rectangular door structure with a short side of 400 mm and a long side of 1000 mm in plan view, including (1) a 5.5 mm core material and a 2 mm glass plate, (2) a 5.5 mm long side. core material, 2 mm resin layer, and 2 mm glass plate, (3) 5.5 mm core material, 3 mm resin layer, and 2 mm glass plate, (4) 5.5 mm core material, 4 mm resin layer, and 2 mm Five types of door structures were prepared: (5) a 5.5 mm core material, a 5 mm resin layer, and a 2 mm glass plate. A wooden core material (MDF) was used as the core material. Further, a resin layer having an apparent density of 65 (kg/m ³ ) and a 25% compressive stress of 65 (kPa) was used as the resin layer. Soda lime glass (manufactured by AGC: FL2) was used as the plate.

(Test method)
In order to simulate three types of core materials with different amounts of warpage _H0 , a flat core material 12 is placed on a flat surface 50, as shown in FIG. A spacer 52 parallel to the short side was inserted between the flat surface 50 and the flat surface 50.

The amount of warpage _H0 of the core material 12 is determined by using the flat core material 12 before inserting the spacer 52 as a reference plane, and measuring the distance from that reference surface to the top of the warped core material 12 after inserting the spacer 52. It was determined by

By changing the thickness of the spacer 52, a plurality of warpage amounts H ₀ of the core material 12 were calculated.

The amount of warpage H ₁ of the laminate having the structure (1) was calculated by the method shown in FIG. 11 . As shown in FIG. 11, the laminate S1 having the core material 12 and the glass plate G is placed with the core material 12 side on the flat surface 50, and the central part of the long side of the laminate S1 is placed on the flat surface 50. 50, a spacer 52 parallel to the short side was inserted. In FIG. 11, as the spacers 52, the plurality of spacers 52 used in calculating the amount of warpage _H0 of the core material 12 in FIG. 10 are used.

The amount of warpage _H1 of the laminate S1 is determined by using the flat glass plate of the laminate S1 before inserting the spacer 52 as a reference plane, and from that reference plane to the top of the warped laminate S1 after inserting the spacer 52. It was determined by measuring the distance.

Using the method shown in FIG. 12, the amount of warpage H ₁ of the laminate having the structures (2) to (5) was calculated. As shown in FIG. 12, the laminate S2 having the core material 12, the resin layer 14, and the glass plate G is placed with the core material 12 side on the flat surface 50, and the center of the long side of the laminate S2 is placed on the flat surface 50. A spacer 52 parallel to the short side was inserted between the flat surface 50 and the flat surface 50. In FIG. 12, as the spacers 52, the plurality of spacers 52 used when calculating the amount of warpage _H0 of the core material 12 in FIG. 10 are used. The amount of warpage _H1 of the laminate S2 is determined by using the flat glass plate of the laminate S2 before inserting the spacer 52 as a reference plane, and from that reference plane to the top of the warped laminate S2 after inserting the spacer 52. It was determined by measuring the distance. The laminate shown in FIG. 12 constitutes the laminate of the embodiment.

(Test results)
The amount of warpage H ₁ of the five types of laminate test specimens was determined with respect to the amount of warpage H ₀ of the core material 12, and the absorption rate (%) was determined using the following formula.

((H ₀ - H ₁ )/H ₀ )×100(%)
Table 1 is a table listing the results of the door structure, the amount of warpage H _{0 ,} the amount of warpage H ₁ , absorption rate, shear stress, and stress relaxation rate.

Examples 1, 6, and 11 do not include the resin layer 14. As a result, the absorption rate is less than 5%.

Examples 2 to 5, Examples 7 to 10, and Examples 12 to 15, which include the resin layer 14, can achieve an absorption rate of 5 (%) or more. It can also be understood that the greater the thickness of the resin layer 14, the greater the absorption rate.

In addition, the maximum value σ ₁ of the shear stress generated at the adhesive interface of the glass plate of the door structure, the maximum value σ 0 of the shear stress generated in the glass plate when a single glass plate is bonded to the core material with the amount _of warp H ₀ , and stress relaxation rate are shown in Table 1. The shear stress generated at the adhesive interface of the glass plate is (M×h)/(2×I), where M is the bending moment, h is the thickness of the glass plate, and I is the second moment of area. The stress relaxation rate is determined by the following formula.
(σ ₀ - σ ₁ )/σ ₀ ×100
Examples 2 to 5, Examples 7 to 10, and Examples 12 to 15, which include the resin layer 14, can achieve a stress relaxation rate of 5 (%) or more. It can also be understood that the greater the thickness of the resin layer 14, the greater the stress relaxation rate. Since the door structures of Examples 2 to 5, Examples 7 to 10, and Examples 12 to 15 include the resin layer 14, the shear stress generated at the adhesive interface of the glass plate is small, and the glass plate and the core material peel off. It's hard to do.

(Test 2)
The specific gravity was calculated for the door structure of the first embodiment. MDF (specific gravity: 0.8) or flash structural board (specific gravity: 0.5) as the core material, polyethylene (specific gravity: 0.07) as the resin layer




































, and a glass plate (specific gravity: 2.5) as a plate-like body were combined to form a door structure.

Table 2 is a table in which the specific gravity was calculated when MDF was used as the core material, and Table 3 was a table in which the specific gravity was calculated when the flash structure board was used as the core material. The specific gravity was determined using the following formula.

Complex specific gravity = (d1×t1+d2×t2+d3×t3)/(t1+t2+t3)
(However, d1: specific gravity of the plate-like body, d2: specific gravity of the resin layer, d3: specific gravity of the core material, t1: thickness of the plate-like body, t2: thickness of the resin layer, t3: thickness of the core material)
Examples 16 to 20 (GR1) show door structures in which the thickness of the core material is 2 mm, and the thickness of the resin layer and the thickness of the glass plate are changed. In addition, in the examples, the thickness of the resin layer of 0.0 (mm) and the thickness of the glass plate of 0.0 (mm) mean that they are not provided.

Examples 21 to 25 (GR2) show door structures in which the total thickness is 17 mm and the thickness of the resin layer and the thickness of the glass plate are changed. Examples 26 to 30 (GR3) show door structures in which the total thickness is 20 mm and the thickness of the resin layer and the thickness of the glass plate are changed.

From the results in Table 2, Examples 20, 25, and 30, which have door structures composed of a core material and a glass plate, had the highest specific gravity among each group (GR1 to GR3). Examples 16, 21, and 26 containing only the core material had the second lowest specific gravity among each group (GR1 to GR3). However, as shown in the results in Table 1, the amount of warpage is not alleviated.

In Examples 17 to 19, Examples 22 to 24, and 27 to 29, the specific gravity of Examples 18, 23, and 28, which have a door structure of a combination of a 1 mm resin layer and a 5 mm glass plate. was the largest among the examples in each group (GR1 to GR3). The specific gravity of Example 19, Example 24, and Example 29 of the door structure of the embodiment consisting of a 10 mm resin layer and a 0.5 mm glass plate was the smallest among the examples of each group (GR1 to GR3). . The door structures of Examples (Examples 17 to 19, Examples 22 to 24, and Examples 27 to 29) had a specific gravity of 1.8 or less.

Examples 31 to 35 show door structures in which the thickness of the core material is 2 mm, and the thickness of the resin layer and the thickness of the glass plate are changed. Examples 36 to 40 show door structures in which the total thickness is 17 mm and the thickness of the resin layer and the thickness of the glass plate are changed. Examples 41 to 45 show door structures in which the total thickness is 20 mm and the thickness of the resin layer and the thickness of the glass plate are changed.

From the results in Table 3, Examples 35, 40, and 45, which have door structures composed of a core material and a glass plate, had the highest specific gravity among each group (GR4 to GR6). Examples 31, 36, and 41 containing only the core material had the second lowest specific gravity among each group (GR4 to GR6). However, as shown in the results in Table 1, the amount of warpage is not alleviated.

In Examples 32 to 34, Examples 37 to 39, and 42 to 44, the specific gravity of Examples 33, 38, and 43, which have a door structure of a combination of a 1 mm resin layer and a 5 mm glass plate. was the largest among the examples in each group (GR4 to GR6). The specific gravity of Example 34, Example 39, and Example 44 of the door structure of the embodiment consisting of a 10 mm resin layer and a 0.5 mm glass plate was the smallest among the examples of each group (GR1 to GR3). . The door structures of Examples (Examples 32 to 34, Examples 37 to 39, and Examples 42 to 44) had a specific gravity of 1.8 or less.

(Test 3)
The specific gravity was calculated for the door structure of the second embodiment. MDF (specific gravity: 0.8) or flash structural board (specific gravity: 0.5) as the core material, polyethylene (specific gravity: 0.07) as the resin layer, and glass plate (specific gravity: 2.5) as the plate-shaped body. They were combined to form a door structure.

Table 4 is a table in which the specific gravity was calculated when MDF was used as the core material, and Table 5 was a table in which the specific gravity was calculated when the flash structure board was used as the core material.

Examples 46 to 50 (GR7) show door structures in which the total thickness is 35 mm and the thickness of the resin layer and the thickness of the glass plate are changed. The door structure of the second embodiment includes two resin layers and two glass plates with a core material in between. The thickness of the resin layer in Table 4 is the total thickness of the two resin layers, and the thickness of the glass plate is the total thickness of the two glass plates.

From the results in Table 4, Example 50, which had a door structure composed of a core material and a glass plate, had the highest specific gravity in Group GR7. Example 46, which had only a core material, had the second lowest specific gravity in Group GR7. However, as shown in the results in Table 1, the amount of warpage is not alleviated.

Among the examples 47 to 49, the specific gravity of example 48, which had a door structure of a combination of a 2 mm resin layer and a 10 mm glass plate, was the highest among the examples of group GR7. The specific gravity of Example 49 of the embodiment door structure composed of a 20 mm resin layer and a 1.0 mm glass plate was the smallest in group GR7. The door structures of Examples (Examples 47 to 49) had a specific gravity of 1.8 or less.

Examples 51 to 55 (GR8) show door structures in which the total thickness is 35 mm and the thickness of the resin layer and the thickness of the glass plate are changed. The thickness of the resin layer in Table 5 is the total thickness of the two resin layers, and the thickness of the glass plate is the total thickness of the two glass plates.

From the results in Table 5, Example 55, which had a door structure composed of a core material and a glass plate, had the highest specific gravity in Group GR8. Example 51, which had only a core material, had the second lowest specific gravity in Group GR8. However, as shown in the results in Table 1, the amount of warpage is not alleviated.

Among the examples 47 to 49, the specific gravity of example 53, which had a door structure of a combination of a 2 mm resin layer and a 10 mm glass plate, was the highest among the examples of group GR7. The specific gravity of Example 54 of the door structure of the embodiment composed of a 20 mm resin layer and a 1.0 mm glass plate was the smallest in group GR8. The door structures of Examples (Examples 47 to 49) had a specific gravity of 1.8 or less.

10 door structure, 12 core material, 12A first surface, 12B second surface, 14 resin layer, 16 plate-shaped body, 18 design layer, 20 door structure, 22 core material, 22A first surface, 22B second surface, 24 1st resin layer, 26 1st plate-shaped body, 28 1st design layer, 30 2nd resin layer, 32 2nd plate-shaped body, 34 2nd design layer, 50 flat surface, 52 spacer, 60 molding material, 62 adhesion Agent G glass plate, S1 laminate, S2 laminate Japanese Patent Application No. 2019-035638 filed on February 28, 2019 and Japanese Patent Application No. 2019-181244 filed on October 1, 2019 The entire contents of the specification, claims, drawings, and abstract are hereby incorporated by reference as a disclosure of this specification.

Claims (18)

a flat plate-shaped core material having a first surface and a second surface facing each other;
a first resin layer that is a foam disposed on the first surface side of the core material;
A laminate including a first plate-shaped body having a design and a brittle shape disposed on the opposite side of the first resin layer from the core material ,
A fitting in which the first plate-shaped body is a glass plate or a ceramic plate . a second resin layer that is a foam disposed on the second surface side of the core material;
A laminate further comprising a second plate-shaped brittle body having a design property disposed on a surface of the second resin layer opposite to the core material ,
The fitting according to claim 1 , wherein the second plate-shaped body is a glass plate or a ceramic plate . The fitting according to claim 1 or 2, wherein the first resin layer is a closed cell. The fitting according to claim 2, wherein the second resin layer is a closed cell. The fitting according to any one of claims 1 to 4, wherein the core material is a wooden core material. Joinery according to claim 5, wherein the wooden core material is medium density fibreboard, flash structural board or particle board. The fitting according to any one of claims 1 to 6, wherein the core material is a metal or resin core material. When the amount of warpage when the core material is a single piece is H0, and the amount of warpage of the laminate is H1,
((H ₀ - H ₁ )/H ₀ )×100≧5%,
The fitting according to any one of claims 1 to 7. The fitting according to any one of claims 1 to 8, wherein the specific gravity of the fitting is 1.8 or less. Any one of claims 1 to 9 , wherein the core material has a thickness of 2 mm or more, the first resin layer has a thickness of 1 mm to 10 mm, and the first plate-shaped body has a thickness of 0.5 mm to 5 mm. The fittings described in paragraph (1) above. The core material has a thickness of 2 mm or more, the first resin layer has a thickness of 1 mm to 10 mm, the first plate-shaped body has a thickness of 0.5 mm to 5 mm, and the second resin layer The fitting according to claim 2 , wherein the second plate-like member has a thickness of 0.5 mm to 5 mm. The fitting according to any one of claims 1 to 11 , comprising a molding material that covers an end surface of the laminate. The fitting according to claim 12 , wherein the end surfaces of the laminate are flush. The fitting according to claim 12 or 13 , wherein the molding material is made of a material selected from the group consisting of acrylonitrile-butadiene-styrene copolymer synthetic resin, acrylic resin, and polyethylene terephthalate resin. The fitting according to any one of claims 1 to 14 , wherein the fitting is a door structure. a flat core material having a first surface and a second surface facing each other; a first resin layer that is a foam disposed on the first surface side of the core material; and a first resin layer of the first resin layer. preparing a laminate including a brittle first plate-shaped body having a design property disposed on a surface opposite to the core material;
cutting the core material and cutting a part of the first resin layer on the core material side ,
A method for manufacturing fittings , wherein the first plate-shaped body is a glass plate or a ceramic plate . The core material and the first resin layer have a larger area than the first plate-like body,
The fitting according to claim 16 , comprising cutting a part of the core material and the first resin layer along the end surface of the first plate-like body to make the end surface of the laminate flush with the end surface. manufacturing method. 18. The method for manufacturing fittings according to claim 17 , comprising attaching a molding material to an end surface of the laminate.

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