JP6485052B2 - Resin panel - Google Patents

Description

  The present invention relates to a resin panel and a manufacturing technique thereof.

  Conventionally, resin panels have been used for various purposes such as automobiles, airplanes and other transport machines, building materials, electrical equipment housings, sports and leisure. Resin panels are those in which the core material is covered with the skin material sheet, but there are those in which only one surface of the core material is covered with the skin material sheet and those in which both surfaces of the core material are covered with the skin material sheet. . Resin panels that cover only one surface of the core material with a skin material sheet are used for applications that do not require the other surface of the core material to be covered with a skin material sheet, for example, for building materials, etc. . A resin panel covering both sides of the core material with a skin sheet is also called a sandwich panel. The resin panel has two skin material sheets and a core material interposed between both skin material sheets. That is, the resin panel has a basic structure of a laminated structure of a skin material sheet, a core material, and a skin material sheet.

  2. Description of the Related Art Conventionally, a resin foam that is a core material with a metal reinforcing material inserted is known. For example, in Cited Document 1, a reinforcing material is fitted into a core made of a thermoplastic resin, which is preliminarily molded in a hollow portion of a hollow double-wall structure into a shape substantially the same as the space in the hollow portion. There is disclosed a resin panel in which a core material in which the core is integrated is accurately positioned so that the core material can be accurately positioned and is not deformed by rattling or molding shrinkage.

JP 2010-174577 A

  In a conventional resin panel, depending on the shape and size of the core material, the tip of one reinforcing material is in contact with the side surface of the other reinforcing material so that at least two long reinforcing materials are T-shaped. May be connected. In that case, the surface where one reinforcing material and the other reinforcing material are in contact with each other is in a state where they are separated, and the rigidity cannot be improved by the reinforcing material in the vicinity of the surface, and the local rigidity in the resin panel is not achieved. Cause a drop. In addition, when one reinforcing member is inserted into the other reinforcing member in order to avoid a reduction in rigidity of the reinforcing member, the upper surface and / or the lower surface of the two reinforcing members are not flush with each other. Appearance or functionality will be impaired.

  The present invention has been made in view of the above-described points, and the object thereof is to suppress a decrease in rigidity at a connecting portion when two long reinforcing members are connected, and the upper surface of the two reinforcing members and It is to provide a resin panel whose lower surface is flush with the same plane.

A first aspect of the present invention is a resin panel in which a structure is covered with a resin sheet.
In this resin panel, the structural body is a long member having the same cross-sectional shape, and the two reinforcing materials are orthogonal to each other, and the top surfaces of the two reinforcing materials are the same. And a connecting member that connects the two reinforcing materials such that the lower surfaces of the two reinforcing materials are in the same plane.

  In the resin panel, the reinforcing material includes, along the longitudinal direction, an upper surface portion having an upper surface of the reinforcing material, a lower surface portion having a lower surface of the reinforcing material, and a support portion that supports the upper surface portion and the lower surface portion in the thickness direction. , An opening provided facing the support portion, a first protruding portion protruding from the opening side end of the upper surface portion toward the lower surface portion, and protruding from the opening side end of the lower surface portion toward the upper surface portion A second projecting portion. In the resin panel, the connecting member has a rectangular parallelepiped shape as a whole, and an upper surface formed with a first groove that engages with a first protrusion of one of the two reinforcing members. A lower surface formed with a second groove that engages with the second protrusion of the first reinforcing member, and perpendicular to the first groove and the second groove, and among the two reinforcing members And a notch portion provided from the upper surface to the lower surface so as to receive the support portion of the other second reinforcing material.

  The resin panel is inserted between the upper surface portion and the lower surface portion of the first reinforcing material through the opening of the first reinforcing material, and the upper surface portion and the lower surface of the second reinforcing material from the opening of the second reinforcing material. You may further provide the resin foam material inserted between parts.

  According to the resin panel according to the present invention, when two long reinforcing members are connected, rigidity reduction is suppressed at the connecting portion, and the upper surface and the lower surface of the two reinforcing members are on the same plane. can do.

The perspective view of the resin-made panels of embodiment, and the one part expanded fracture view. The perspective view of the core material for resin panels of embodiment. The perspective view of the foam used as the origin of the some resin foam of the core material for resin panels of embodiment. The figure for demonstrating the process of shape | molding the foam shown in FIG. The figure for demonstrating the process of shape | molding the foam shown in FIG. The top view of the foam used as the origin of the some resin foam material of the core material 10 of embodiment. Sectional drawing of AA, BB, CC, DD shown in FIG. The expansion perspective view of the E section shown in FIG. It is a perspective view of the reinforcing material used for the resin panel of embodiment. It is the perspective view and three-plane figure which show the structure of the connection member used for the resin-made panels of embodiment. The figure explaining the method to connect reinforcement materials using a connection member in the core material for resin panels of embodiment. The figure explaining the method to connect reinforcement materials using a connection member in the core material for resin panels of embodiment. The figure explaining the method to connect reinforcement materials using a connection member in the core material for resin panels of embodiment. The figure which shows the process of assembling the core material for resin panels of embodiment. Sectional drawing of the core material for resin panels of embodiment. The figure which shows the whole structure of the molding apparatus of the resin panels of embodiment. The figure which shows the state in which the sealed space was formed between the resin sheet and the formation surface of a division mold in the molding method of the resin panel of embodiment. The figure which shows the state in which the resin sheet was formed in the shape along the formation surface of a division mold in the molding method of the resin panel of embodiment. The figure which shows the state which inserted the core material in the split mold in the molding method of the resin panel of embodiment. The figure which shows the state which moved the division mold to the closed position in the molding method of the resin panel of embodiment. The figure which shows the state before pressing a core material with respect to the molten resin sheet in the modification of embodiment. The figure which shows the state after pressing the core material until it reaches the formation surface of a split mold with respect to the molten resin sheet in the modification of embodiment.

  Hereinafter, one embodiment of the resin panel of the present invention, the core material for resin panel, and the manufacturing method thereof will be described.

(1) Resin Panel and Resin Panel Core Material As shown in FIG. 1, the outer shape of the resin panel 1 according to the embodiment includes a front surface 1a and a back surface 1b, and a front surface 1a and a back surface. It consists of the side wall surface 1c interposed between 1b. The front surface 1a, the back surface 1b, and the side wall surface 1c are constituted by resin sheets Sa and Sb of thermoplastic resin, and a core material 10 is housed therein. That is, the resin panel 1 has a sandwich structure in which the core material 10 is sandwiched between the thermoplastic resin sheets Sa and Sb. The core material 10 is an example of the structure of the present invention.

  In the resin panel 1 of the embodiment, the resin sheets Sa and Sb serving as the skin material sheets are not limited to the resin material, but are preferably formed from a non-foamed resin in order to ensure the rigidity of the resin panel 1. . For example, in consideration of moldability, the resin sheets Sa and Sb may be made by mixing polystyrene (PS) and styrene ethylene butylene styrene block copolymer resin (SEBS) with polypropylene (PP) as a main material.

  As shown in FIG. 2, the core material 10 is a foam structure having a structure in which resin foam materials 201 to 209 are reinforced by reinforcing materials 301 to 308. The reinforcing members 301 to 308 reinforce the resin foam materials 201 to 209 with a well-shaped layout as a whole in a plan view of the core member 10. By arranging the reinforcing material in a well-shaped layout, the rigidity against the external force from the periphery of the core material 10 can be increased, and the rigidity against the vertical external force near the center of the core material 10 can also be increased. .

  As will be described later, the reinforcing members 301 to 308 have the same cross-sectional shape, and the reinforcing members are connected to each other by a connecting member 140 (described later) that is not visually recognized in FIG. . The reinforcing material 301 and the reinforcing material 302 have the same length in the longitudinal direction, the reinforcing materials 303, 304, 306, and 307 have the same length in the longitudinal direction, and the reinforcing material 305 and the reinforcing material 308 have the same length in the longitudinal direction. It is.

  In the following description, when each of the reinforcing members 301 to 308 is described without being distinguished, it is collectively referred to as “reinforcing material 30”. The reinforcing member 30 is a long member, and its cross-sectional shape is an H-shaped member (so-called H-shaped extrusion reinforcement), but the shape of the reinforcing member 30 is not limited to this. The cross-sectional shape of the reinforcing member 30 may be, for example, a C shape, a U shape, a square pipe shape, a circular pipe shape, or the like, and may be an appropriate shape as long as it can be fitted and integrated with the resin foam materials 201 to 209. Good. The reinforcing member 30 is preferably made of a metal such as aluminum or a hard plastic.

The front surface and the back surface of the core member 10 are in the same plane. That is, in the state assembled as the core member 10, the front and back surfaces of the resin foams 201 to 209 are flush with the front and back surfaces of the reinforcing members 301 to 308, respectively.
The thicknesses of the resin foams 201 to 209 and the thickness of the reinforcing member 30 are the target thickness as the resin panel 1 and the thickness of the resin sheet for ensuring the target rigidity of the resin panel 1. It is determined according to the situation and is not particularly limited.

  In the resin panel 1 of the embodiment, the resin foams 201 to 209 are formed using, for example, a thermoplastic resin. The resin material is not limited, but includes any one of polyolefins such as polypropylene and polyethylene, acrylic derivatives such as polyamide, polystyrene, and polyvinyl chloride, or a mixture of two or more. The resin foams 201 to 209 have a large proportion of the volume of the resin panel 1 and are preferably foamed resins foamed using a foam material for weight reduction, but the expansion ratio is not particularly limited. .

  In the resin panel 1 of the embodiment, examples of the foam material that can be used for the resin foam materials 201 to 209 include known physical foam materials, chemical foam materials, and mixtures thereof. For example, as the physical foaming material, inorganic physical foaming materials such as air, carbon dioxide gas and nitrogen gas, and organic physical foaming materials such as butane, pentane, hexane, dichloromethane and dichloroethane can be applied. Examples of the chemical foaming material include azodicarbonamide (ADCA), N, N′-dinitrosopentamethylenetetramine, 4,4′-oxybis (benzenesulfonylhydrazide), diphenylsulfone-3,3′-disulfonyl. Organic foams such as hydrazide, p-toluenesulfonyl semicarbazide, trihydrazinotriazine or azobisisobutyronitrile, citric acid, oxalic acid, fumaric acid, phthalic acid, malic acid, tartaric acid, cyclohexane-1,2-dicarboxylic acid , A mixture of polycarboxylic acids such as camphoric acid, ethylenediaminetetraacetic acid, triethylenetetraminehexaacetic acid, nitrilolic acid and inorganic carbonic acid compounds such as sodium bicarbonate, sodium aluminum bicarbonate, potassium bicarbonate, ammonium bicarbonate, ammonium carbonate Citric dihydrogen sodium hydrogen salts of polycarboxylic acids, such as potassium oxalate and the like as the inorganic foam.

The resin sheets Sa and Sb and the resin foams 201 to 209 may be molded using a resin material mixed with a glass filler for the purpose of increasing rigidity and strength.
Examples of the glass filler include glass fiber, glass fiber cloth such as glass cloth and glass nonwoven fabric, glass beads, glass flakes, glass powder, and milled glass. Examples of the glass include E glass, C glass, A glass, S glass, D glass, NE glass, T glass, quartz, low dielectric constant glass, and high dielectric constant glass.
In addition to the glass filler, inorganic fillers such as talc, calcium carbonate, wollastonite, magnesium-based material, and the like for increasing rigidity may be mixed.

(2) Core material 10 and its manufacturing method Next, with reference to FIGS. 3-12, the core material 10 of this embodiment and its manufacturing method are demonstrated.
FIG. 3 is a perspective view of the foam 20 that is the basis of the resin foams 201 to 209 of the core 10 of the embodiment. 4A and 4B are diagrams for sequentially explaining the process of molding the foam 20 shown in FIG. FIG. 5 is a plan view of the foam 20 that is the basis of the resin foams 201 to 209 of the core member 10 of the embodiment. 6A to 6D are cross-sectional views taken along lines AA, BB, CC, and DD shown in FIG. 5, respectively. FIG. 7 is an enlarged perspective view of an E portion shown in FIG. FIG. 8 is a perspective view of the reinforcing member 30 used in the resin panel of the embodiment. FIG. 9 is a view showing the structure of the connecting member 140 used in the resin panel of the embodiment, where (a) is a perspective view and (b) is a three-view drawing. 10A to 10C are diagrams illustrating a method of connecting the reinforcing members 30 using the connecting member 140 in the resin panel core according to the embodiment. Drawing 11 is a figure showing the process of assembling core material 10 of an embodiment. 12A and 12B are cross-sectional views of the core material 10 according to the embodiment. FIG. 12A is a cross-sectional view taken along the line XX in FIG. 2, and FIG.

(2-1) Foam as a base of a plurality of resin foam materials The resin foam materials 201 to 209 of the present embodiment are produced by cleaving the foam body 20 that is molded as an integral body. As shown in FIG. 3, the outer shape of the foam 20 is composed of a front surface 20a and a back surface 20b, and a side wall surface 20c interposed between the front surface 20a and the back surface 20b.
As shown in FIG. 3, four straight grooves D <b> 1 to D <b> 4 are formed on the front surface 20 a of the foam 20 at positions where the reinforcing member 30 should be disposed when assembled as the core member 10. Has been. Openings A1 to A4 are formed at positions where the grooves D1 to D4 intersect to avoid interference with the connecting member 140 that connects the reinforcing members 30 to each other. That is, an opening A1 is formed at a position where the groove D1 and the groove D2 intersect, an opening A2 is formed at a position where the groove D1 and the groove D3 intersect, and an opening A3 is formed at a position where the groove D3 and the groove D4 intersect. An opening A4 is formed at a position where the groove D2 and the groove D4 intersect.

  Although not shown in FIG. 3, four grooves D1 to D4 are similarly formed on the back surface 20b of the foam 20 at positions corresponding to the four grooves D1 to D4 of the front surface 20a in a plan view. Is formed. The groove portions D1 to D4 are provided for cleaving the foam 20 and fitting the eight reinforcing members 301 to 308 after the cleaving. The structure of the groove portion of the foam 20 will be described in detail later.

(2-2) Molding of foam as a base of a plurality of resin foams The foam 20 is molded by a bead method in-mold foam molding method using a molding apparatus 50 shown in FIGS. 4A and 4B. As shown in FIG. 4A (a), the molding apparatus 50 is provided with molds 51 and 52 arranged to face each other. The molds 51 and 52 constitute part of the vacancies 53 and 54, respectively. Cooling tubes 41 and 42 are disposed in the vacant chambers 53 and 54.
When the molds 51 and 52 are closed from the state shown in FIG. 4A (a), a cavity 50a which is a sealed space by the molds 51 and 52 is formed as shown in FIG. 4A (b). With the molds 51 and 52 closed, the foam beads are filled through the feeders 43 and 44. The amount of foam beads to be filled is, for example, 105 to 110% of the volume of the cavity 50a. Next, as shown in FIG. 4B (c), steam (for example, a steam pressure of 3.0 to 3.5 kgf / cm ² ) is supplied from the steam inlets 55 and 56 to the vacant chambers 53 and 54 for 10 to 30 seconds, for example. inject. The vapor enters the bubbles in the foam beads and voids between the individual pores formed in the mold, and fuses the beads together. Thereafter, as shown in FIG. 4B (d), cooling water is injected into the cooling pipes 41 and 42 from the cooling water inlets 57 and 58 and sprayed onto the molds 51 and 52 to cool the molds 51 and 52 and the foam 20. Thus, the foam 20 is solidified. Next, as shown in FIG. 4B (e), the mold is opened and the foam 20 is taken out. The foam 20 is then cured, for example, by placing it in a room at 50 to 70 ° C. for 12 to 24 hours to promote hardening and prevent sink marks and deformation.

(2-3) Example of Detailed Shape of Foam as Source of Multiple Resin Foams Next, the detailed shape of the grooves D1 to D4 of the foam 20 will be described with reference to FIGS. Hereinafter, only the groove part D1 on the front surface 20a side will be described, but the other groove parts D2 to D4 and the groove part on the back surface 20b side have the same shape. In the present embodiment, when a surface orthogonal to the front surface 20a at the center of each groove portion is assumed, each groove portion has a symmetrical structure across the surface.

In the groove portion D1, engagement surfaces 211 and 221 are formed with a predetermined step amount with reference to the front surface 20a of the foam body 20. As shown in FIG. 5, the engagement surfaces 211 and 221 are formed in almost the entire region of the groove portion D1 from one side of the front surface 20a of the foam 20 to the other side facing the side.
The engaging surfaces 211 and 221 are engaged with a reinforcing member 301 having an H-shaped cross section (H-shaped extrusion reinforcement), whereby the resin foams 201 to 205 and 209 are connected to the reinforcing member 301 as shown in FIG. It is provided to fit together. The level difference between the front surface 20a and the engagement surfaces 211 and 221 is such that the resin foam materials 201 to 205 and 209 are in the state where the resin foam materials 201 to 205 and 209 are integrally fitted to the reinforcing material 301. As long as the surface (that is, the front surface 20a of the foam 20) and the upper surface of the reinforcing member 301 are substantially on the same plane, they may be appropriately set. Moreover, the width | variety of the engaging surfaces 211 and 221 should just ensure the length which the reinforcement material 301 can engage at least.

  As shown in FIG. 5, six protrusions 211a and 221a are formed along the direction in which the engagement surfaces 211 and 221 extend, but the number of protrusions 211a and 221a is merely an example, and the number shown Not limited. The protrusions 211a and 221a increase the surface pressure generated between the reinforcing member 301 and the engaging surfaces 211 and 221 when the H-shaped reinforcing member 301 (H-shaped extrusion reinforcement) is engaged, thereby It is provided for the purpose of increasing the fitting force of the resin foams 201 to 205, 209 to the reinforcing member 301. That is, by providing the protrusions 211 a and 221 a, it is possible to make it difficult for each resin foam to be detached from the reinforcing material 301 after fitting each resin foam to the reinforcing material 301.

5 and 6 illustrate the case where the protrusions 211a and 221a are provided at positions facing each other in all locations, the present invention is not limited to this case. The protrusion 211a and the protrusion 221a may be provided at positions independent of each other on the engaging surface 211 and the engaging surface 221, respectively.
The height of the protrusions 211a and 221a, the length along the direction in which the engagement surfaces 211 and 221 extend, and the number of the protrusions are the workability when assembling each resin foam material and the reinforcing material 301 (that is, fitting) Force) and the detachment force after each resin foam material is fitted to the reinforcing member 301 is set as appropriate.

  In the example shown in FIGS. 5 and 6, the protrusions 211 a and 221 a are formed at the ends of the engagement surfaces 211 and 221, respectively, but the present invention is not limited to this example. Since the surface pressure generated between the reinforcing material 301 and the engaging surfaces 211 and 221 can be increased within the range where the reinforcing material 301 is engaged with the engaging surfaces 211 and 221, the protrusions 211 a and 221 a are engaged. It does not need to be formed at the ends of the mating surfaces 211 and 221.

As clearly seen in FIG. 6, a shallow groove 230a having a relatively shallow groove is preferably provided between the engagement surfaces 211 and 221 as a groove for cleaving the foam 20 at the groove D1. A deep groove 230b having a relatively deep groove is formed. In the example shown in FIGS. 5 and 6, eleven shallow grooves 230a and ten deep grooves 230b are provided. The reason why the shallow groove 230a and the deep groove 230b are provided as grooves for cleaving the foam 20 at the groove portion D1 is as follows. That is, if only the deep groove is provided, the force for cleaving the foam 20 in the subsequent process can be reduced, and workability is improved, but at the position corresponding to the deep groove in the process of forming the foam 20. Since the passage of the mold cavity is narrow, it becomes difficult to fill the entire area of the cavity with foam beads from the feeder. On the other hand, if only the shallow groove is provided, it becomes easy to fill the foam beads from the feeder in the step of forming the foam 20, but the force for cleaving the foam 20 in the groove D1 in the subsequent step becomes large. As a result, workability deteriorates. Therefore, from the viewpoint of achieving both formability and workability, the shallow groove 230a and the deep groove 230b are provided.
As shown in FIG. 5, it is preferable to provide a plurality of shallow grooves 230a and deep grooves 230b alternately. This is because the position of the plurality of shallow grooves is dispersed along the direction in which the engagement surfaces 211 and 221 extend while achieving both formability and workability, so that the accuracy of the cleaving position of the foam 20 is improved. It is.

As shown in FIG. 7, it is preferable that stoppers 212 and 222 for preventing the reinforcing member 301 from falling off after the core member 10 is assembled are preferably formed at the E portion of FIG. 5, that is, at one end of the groove portion D1. .
In the example shown in FIG. 7, the stoppers 212 and 222 constitute the same plane as the front surface 20a, but the present invention is not limited to this. The stoppers 212 and 222 need only be able to prevent the reinforcing member 301 from moving and dropping off along the longitudinal direction thereof, and thus the stoppers 212 and 222 are not necessarily required to be flush with the front surface 20a, and the reinforcing member 301 is engaged. What is necessary is just to protrude to the surface 20a side rather than the engaging surfaces 211 and 221.

(2-4) Structure of Reinforcing Material and Connecting Member Next, the structure of the reinforcing material 30 and the connecting member 140 will be described with reference to FIGS. 8 and 9.
As shown in FIG. 8, the reinforcing member 30 is a long member, and along its longitudinal direction, an upper surface portion 31, a lower surface portion 32, a support portion 33, a first protruding portion 31a, and a second protruding portion. 32a and an opening 30G. As described above, the reinforcing members 301 to 308 have the structure of the reinforcing member 30 shown in FIG.
The upper surface portion 31 has an upper surface 30U of the reinforcing material 30. The lower surface portion 32 has a lower surface 30 </ b> L of the reinforcing material 30. The upper surface 30U is flush with the front surface of the core material 10, and the lower surface 30L is flush with the back surface of the core material 10. The support portion 33 supports the upper surface portion 31 and the lower surface portion 32 in the thickness direction at the center of the upper surface portion 31 and the lower surface portion 32, and extends in a direction orthogonal to the upper surface 30U and the lower surface 30L. The opening 30 </ b> G is provided to face the support portion 33. With this configuration, the cross-sectional shape of the reinforcing member 30 is H-shaped.
The first protrusion 31 a protrudes from the end on the opening 30 </ b> G side of the upper surface portion 31 toward the lower surface portion 32. The second protrusion 32 a protrudes from the end on the opening 30 </ b> G side of the lower surface 32 toward the upper surface 31.

As shown in FIG. 9, the connecting member 140 has a rectangular parallelepiped shape as a whole, and includes an upper surface 140U, a lower surface 140L, a first side surface 140S1, and a second side surface 140S2.
Assuming the case where the first reinforcing member 30 and the second reinforcing member 30 are connected, the upper surface 140U of the connecting member 140 has a first protrusion provided on the upper surface portion 31 side of the first reinforcing member 30. A first groove 141 that engages with the portion 31a is formed. On the lower surface 140L of the connecting member 140, a second groove 142 that engages with the second protruding portion 32a provided on the lower surface portion 32 side of the first reinforcing member 30 is formed.
The notch 143 of the connecting member 140 is provided from the upper surface 140U to the lower surface 140L so as to be orthogonal to the first groove 141 and the second groove 142 and to receive the support portion 33 of the second reinforcing member 30. It has been.

(2-5) Connection Between Reinforcing Materials Next, the connection between the reinforcing materials 30 using the connecting member 140 will be described with reference to FIGS. 10A to 10C.
10A to 10C illustrate the case where the reinforcing member 301 and the reinforcing member 303 are connected using the connecting member 140, the other two reinforcing members are connected in the same manner. That is, the connection between the reinforcing member 301 and each of the reinforcing members 304, 305, and 308 is performed in the same manner, and the connection between the reinforcing member 302 and each of the reinforcing members 305, 306, 307, and 308 is performed in the same manner. Is called.

In the state S <b> 1 shown in FIG. 10A, the connecting member 140 is fitted from one end of the reinforcing material 301. Here, the first groove 141 of the connecting member 140 is engaged with the first protrusion 31 a provided on the upper surface portion 31 side of the reinforcing member 301, and the second groove 142 of the connecting member 140 is the reinforcing member 301. The connecting member 140 is slidable in the longitudinal direction of the reinforcing member 301 in a state of being engaged with the second protrusion 32 a provided on the lower surface portion 32 side of the reinforcing member 301.
In a state where the connecting member 140 is fitted in the reinforcing material 301, the upper surface 140U of the connecting member 140 is positioned below the upper surface 30U of the reinforcing material 301, and the lower surface 140L of the upper surface 140U is lower than the lower surface 30L of the reinforcing material 301. Located above.

In the state S2 shown in FIG. 10B, the connecting member 140 fitted in the reinforcing material 301 is slid along the longitudinal direction of the reinforcing material 301 to the position where the reinforcing material 303 should be connected to the reinforcing material 301. Yes.
In the state S3 shown in FIG. 10B, a state in which the reinforcing material 303 is about to be fitted into the connecting member 140 from a direction orthogonal to the longitudinal direction of the reinforcing material 301 is shown. At this time, the support portion 33 of the reinforcing member 303 is inserted into the notch portion 143 provided across the upper surface 140U and the lower surface 140L of the connecting member 140, and the notch portion 143 of the connecting member 140 and the support portion 33 of the reinforcing material 303 are inserted. Engage. Furthermore, the upper surface 140U and the lower surface 140L of the connecting member 140 are inscribed in the upper surface portion 31 and the lower surface portion 32 of the reinforcing member 303, respectively, and both surfaces of the first side surface 140S1 of the connecting member 140 are the first protruding portions 31a of the reinforcing member 303. And inscribed in the second protrusion 32a. That is, the part which protrudes from the reinforcement material 301 among the connection members 140 will be in the state inserted in the inside of the reinforcement material 303, and the reinforcement material 303 can slide in the longitudinal direction in the state.

  When the reinforcing material 303 is slid until the end portion of the reinforcing material 303 comes into contact with the reinforcing material 301, a state S4 shown in FIG. 10C is obtained. In this state, the upper surface 30U of the reinforcing material 301 and the upper surface 30U of the reinforcing material 303 are in the same plane, and the lower surface 30L of the reinforcing material 301 and the lower surface 30L of the reinforcing material 303 are in the same plane. That is, the height of the connecting member 140 is set lower than the height of the reinforcing material 30 so that the upper surfaces and the lower surfaces of the reinforcing materials are in the same plane.

(2-6) Cleaving of Foam and Assembly of Core Material Next, steps after the foam 20 is molded will be described with reference to FIGS.
When the foam 20 is molded, the foam 20 is cleaved at the shallow grooves 230a and the deep grooves 230b of the four grooves D1 to D4, and is divided into nine resin foams 201 to 209. Next, as described with reference to FIGS. 10A to 10C, each of the nine resin foam materials 201 to 209 is connected to the reinforcing material 30 from the opening 30 </ b> G of the reinforcing material 30 while connecting the reinforcing materials 30 using the connecting member 140. The core material 10 in which the nine resin foam materials 201 to 209 and the reinforcing materials 301 to 308 are integrated is assembled.

  Referring to FIG. 2, an example of a method of assembling the core material 10 is assembled along the direction from the end E1 side to the end E2 side of the core material 10 as shown in the following order (i) to (vii). On the contrary, the core member 10 may be assembled along the direction from the end E2 side to the end E1 side.

(i) Two connecting members 140 from the end E1 side of the core material 10 are fitted into the reinforcing material 301 and the reinforcing material 302, respectively, and moved to positions where the reinforcing materials 304, 305, and 306 are connected.
(ii) The support portions 33 of the reinforcing members 304, 305, and 306 are inserted into the notches 143 (four places) of the two connecting members 140 fitted in (i). Thereby, one end of the reinforcing material 304 is connected to the reinforcing material 301, and one end of the reinforcing material 306 is connected to the reinforcing material 302. One end of the reinforcing material 305 is connected to the reinforcing material 301 at a position facing the reinforcing material 304, and the other end of the reinforcing material 305 is connected to the reinforcing material 302 at a position facing the reinforcing material 306.
(iii) The resin foam 204 is inserted into the reinforcing members 301 and 304, the resin foam 205 is inserted into the reinforcing members 301, 302, and 305, and the resin foam 206 is inserted into the reinforcing members 302 and 306. insert.
(iv) The resin foam 203 is inserted into the reinforcements 301 and 304, the resin foam 201 is inserted into the reinforcements 301, 302, and 305, and the resin foam 207 is inserted into the reinforcements 302 and 306. insert.
(v) Two connecting members 140 from the end E2 side of the core material 10 are fitted into the reinforcing material 301 and the reinforcing material 302, respectively, and moved until they contact the resin foam materials 201, 203, and 207.
(vi) The support portions 33 of the reinforcing members 303, 307, and 308 are inserted into the notches 143 (four locations) of the two connecting members 140 fitted in (v). Thereby, one end of the reinforcing material 303 is connected to the reinforcing material 301, and one end of the reinforcing material 307 is connected to the reinforcing material 302. One end of the reinforcing material 308 is connected to the reinforcing material 301 at a position facing the reinforcing material 303, and the other end of the reinforcing material 308 is connected to the reinforcing material 302 at a position facing the reinforcing material 307.
(vii) The resin foam 202 is inserted into the reinforcing members 301 and 303, and the resin foam 209 is inserted into the reinforcing members 301, 302, and 308 (see FIG. 11). The resin foam 208 is inserted into the reinforcing members 302 and 307.
The core material 10 is completed through the steps (i) to (vii).

  As illustrated in FIG. 12A (an X-X cross-sectional view of the core material 10 illustrated in FIG. 2), in the core material 10 of the present embodiment, the resin foam materials 201 to 209 are inserted into the reinforcing material 30. In FIGS. 12A and 12B, the reinforcing material 30 of each resin foam material (in FIG. 12A, resin foam material 201, 203) is provided at the portion where the protrusions 211a and 221a of each resin foam material are formed. 301), even if a rightward or leftward force in the drawing is applied to each resin foam (resin foams 201 and 203 in FIG. 12A), respectively. Since the first projecting portion 31a and the second projecting portion 32a of the reinforcing material 30 are in contact with the projections 211a and 221a of the resin foam materials, the resin foam materials are difficult to separate from the reinforcing material 30.

  As shown in FIG. 12B (YY cross-sectional view of the core material 10 shown in FIG. 2), in the core material 10 of the present embodiment, the interior of the reinforcing material 30 (in FIG. 12B, the reinforcing material). 301 and the inside of the reinforcing material 303 and between the inside of the reinforcing material 301 and the reinforcing material 308), the connecting member 140 firmly connects the reinforcing materials so that the connected reinforcing materials are in contact with each other. A decrease in the rigidity of the core material 10 at a portion (specifically, a position in the vicinity of the first protrusion 31a and the second protrusion 32a of the reinforcing member 301) is suppressed.

  In the core member 10 of the present embodiment, the first groove 141 of the connecting member 140 is engaged with the first protrusion 31 a of the reinforcing member 30, and the second groove 142 of the connecting member 140 is the second member of the reinforcing member 30. Therefore, the connecting member 140 fitted in the reinforcing member 30 does not fall off in a direction perpendicular to the longitudinal direction of the reinforcing member 30. Moreover, in the core material 10 of this embodiment, since the resin foam materials 201-209 are inserted into the reinforcing material 30 as shown in FIG. 11, the connecting member 140 once fitted into the reinforcing material 30 is the reinforcing material. It does not slide off along the longitudinal direction of the material 30 and come off the reinforcing material 30.

  In the core material 10 of the present embodiment, the upper surfaces and the lower surfaces of the reinforcing members 30 to be connected (reinforcing members 301 and 303 in FIG. 12B) are on the same plane. Therefore, when the core material 10 is covered with the resin sheets Sa and Sb, the resin panel 1 is flat across the front surface 1a and the back surface 1b, and the appearance or functionality of the resin panel 1 is not impaired. .

(3) Molding method of resin panel Next, with reference to FIGS. 13-19, the apparatus and method which shape | mold the resin panel 1 of embodiment using a metal mold | die are demonstrated.

First, the shaping | molding apparatus of the resin panels 1 of embodiment is demonstrated.
As shown in FIG. 13, the molding device 90 of the embodiment includes an extrusion device 60 and a mold clamping device 70 disposed below the extrusion device 60. The molten resin sheet P extruded from the extrusion device 60 is sent to the mold clamping device 70, and the molten resin sheet P is molded in the mold clamping device 70. In FIG. 13, only the mold clamping device 70 and the molten resin sheet P are shown in a sectional view.

  The extrusion device 60 includes T dies 61A and 61B, accumulators 81A and 81B, plungers 82A and 82B, extruders 83A and 83B, and resin supply hoppers 84A and 84B. In the extrusion device 60, the resin raw material is plasticized and melted using an extruder, and this molten resin is pushed out of the die by T dies 61A and 61B. In the extrusion apparatus 60, the extrusion capabilities of the extruders 83A and 83B can be appropriately selected depending on the size of the resin panel 1, but from the viewpoint of shortening the molding cycle of the resin panel 1, it is 50 kg / hour or more. It is preferable.

In the extrusion device 60, the extrusion speed of the resin sheet is set by the T dies 61A and 61B and the accumulators 81A and 81B. Further, from the viewpoint of preventing drawdown, the extrusion of the resin sheet in the T dies 61A and 61B is preferably completed within 40 seconds, and more preferably within 30 seconds. For this reason, the molten resin material stored in the accumulators 81A and 81B is extruded from the T dies 61A and 61B at 50 kg / hour or more, preferably 60 kg / hour or more per 1 cm ² . At this time, the effect of the drawdown can be further suppressed by changing the slits at the die tips of the T dies 61A and 61B according to the extrusion speed of the resin sheet. That is, by gradually widening the interval between the slits of the T dies 61A and 61B from the start of extrusion and maximizing at the end of extrusion, the thickness change due to the weight of the resin sheet is suppressed, and the resin sheet is spread over a wide range in the vertical direction. A uniform thickness can be obtained. Thereby, the thickness of the resin sheet can be made uniform when a pair of split molds described later are moved from the open position to the closed position.

  Referring again to FIG. 13, the mold clamping device 70 is a pair of split molds 71 </ b> A that are moved between an open position and a closed position in a direction substantially orthogonal to the supply direction of the molten resin sheet P. 71B. The pair of split molds 71A and 71B are arranged in a state where the formation surfaces 72A and 72B corresponding to each of them are opposed to each other. Irregularities may be provided on the surfaces of the formation surfaces 72A and 72B in accordance with the approximate outer shape of the resin panel 1.

  In each of the pair of split molds 71A and 71B, pinch-off portions 74A and 74B are formed in the vicinity of upper and lower ends of the corresponding formation surfaces 72A and 72B. The pinch-off portions 74A and 74B are formed annularly around the formation surfaces 72A and 72B, respectively, and project toward the opposing split molds 71B and 71A. Thus, when clamping the pair of split molds 71A and 71B, the tip portions of the respective pinch-off portions 74A and 74B come into contact with each other so that the parting line PL is formed on the periphery of the molten resin sheet P. It has become.

  The pair of split molds 71A and 71B are provided with sliding portions 75A and 75B that can protrude from the formation surfaces 72A and 72B around the formation surfaces 72A and 72B. The sliding portions 75A and 75B protrude from the formation surfaces 72A and 72B, and the end surfaces thereof are in contact with the resin sheet P, whereby the formation surfaces 72A and 72B of the resin sheet P and the pair of split molds 71A and 71B are contacted. Are provided in such a manner that a sealed space is formed between them.

  The pair of split molds 71A and 71B includes vacuum chambers 73A and 73B. The vacuum chambers 73A and 73B are connected to a vacuum pump and a vacuum tank (both not shown). Between the vacuum chambers 73A and 73B and the formation surfaces 72A and 72B, a communication path (not shown) that communicates for vacuum suction of the sealed space is provided.

  The pair of split molds 71A and 71B are driven by a mold driving device (not shown) so as to be movable between an open position and a closed position. In the open position, two continuous resin sheets P in a molten state can be arranged with a space between each other between the pair of split molds 71A and 71B. The two resin sheets P become the resin sheets Sa and Sb in the resin panel 1 after molding. In the closed position, the pinch-off portions 74A and 74B of the pair of split molds 71A and 71B abut.

Next, a method for forming the resin panel 1 will be described.
First, as shown in FIG. 13, the molten resin sheet P is extruded vertically downward from each die slit from the extrusion device 60. The extruded resin sheet P is supplied between the pair of split molds 71A and 71B through rollers 65A and 65B, respectively. At this point, the pair of split molds 71A and 71B are in the open position.

When a decorative sheet (for example, a decorative sheet made of cloth) is added to the surface of the resin panel 1, the hanging resin sheet P and the decorative sheet can be pressed against each other by the rollers 65A and 65B. At this time, it is preferable that the decorative sheet has a cloth-like inner surface in order to strengthen welding with the resin sheet P. The rollers 65A and 65B are preferably coated with a fluorine thin film on the surface and heated to about 70 to 100 ° C. in order to prevent resin adhesion and improve the welding strength.
Alternatively, a decorative sheet may be installed on the formation surface of the split mold in advance, and the resin sheet P may be welded to the decorative sheet simultaneously with the molding of the resin sheet P.
In addition, as a cloth-made decorative sheet, a nonwoven fabric is preferable. In particular, it is preferable to use a needle punched nonwoven fabric obtained by piercing a needle with a barb and mechanically binding fibers to improve the welding strength.

Next, as shown in FIG. 14, the sliding portions 75A and 75B around the forming surfaces 72A and 72B are protruded, and the end surfaces thereof are brought into contact with the resin sheet P. Thereby, a sealed space is formed between the resin sheet P and the formation surfaces 72A and 72B of the pair of split molds 71A and 71B. And the air in sealed space is attracted | sucked by the communicating path (not shown) provided between vacuum chamber 73A, 73B and formation surface 72A, 72B. By this suction, the two resin sheets P are pressed against the formation surfaces 72A and 72B of the pair of split molds 71A and 71B, respectively, and as shown in FIG. 15, the shape along the formation surfaces 72A and 72B, that is, It is formed in a substantially outer shape of the resin panel 1.
The resin sheet P is brought into contact with the sliding portions 75A and 75B by being configured so that the air on the resin sheet P side can be sucked from the tips of the sliding portions 75A and 75B around the forming surfaces 72A and 72B. In a state, it can hold | maintain reliably. Further, when the sealed space is sucked to make the resin sheet P into a shape along the forming surfaces 72A and 72B, it is possible to suppress wrinkles.

  Next, the core material 10 is positioned between a pair of split molds 71A and 71B using a manipulator (not shown), and as shown in FIG. 16, one split mold (in FIG. Inserted so as to press against the split mold 71B). Thereby, the core material 10 is welded to the resin sheet P. Although depending on the resin material, the resin sheet P shrinks around 1% by cooling after molding. The shapes of the formation surfaces 72A and 72B of the split molds 71A and 71B are set in consideration of the contraction. That is, the formation surfaces 72A and 72B are set to be slightly larger than the target dimension after molding of the resin sheet. Therefore, the core material 10 in the normal temperature state can be inserted into the split mold with a margin.

  Next, as shown in FIG. 17, the pair of split molds 71A and 71B are moved from the open position to the closed position and clamped. Thereby, the core material 10 welded to one resin sheet P (right side of the drawing) is also welded to the other resin sheet P (left side of the drawing). Furthermore, in the pinch-off portions 74A and 74B of the pair of split molds 71A and 71B, the peripheral edges of the pair of resin sheets P are welded to form the parting line PL. It should be noted that the core material 10 is pre-positioned so as not to be deformed by mold clamping in order to weld the preformed core material 10 at room temperature to the molten resin sheet P at the time of mold clamping. Yes.

  Finally, the pair of split molds 71A and 71B are moved again to the open position, the molded resin panel 1 is separated from the formation surfaces 72A and 72B, and the burrs formed around the parting line PL are removed with a cutter or the like. Cut and remove. In addition, you may comprise so that a burr | flash may be cut | disconnected by pinch-off part 74A, 74B simultaneously with mold clamping. Thus, the resin panel 1 in which the resin sheet Sa, the core material 10, and the resin sheet Sb are laminated is completed.

  As described above, a glass filler, an inorganic filler, or a carbon filler may be mixed into the resin sheet P for the purpose of increasing rigidity and strength.

As described above, according to the method in which the extruded resin sheet in the molten state is sandwiched between the divided molds and solidified before being solidified, the molding cost can be reduced. This is because, for example, the reheating step is not necessary and the molding cost can be reduced as compared with a method in which the solidified resin sheet is heated again to be melted and welded to the core material.
Moreover, the occupation area of a manufacturing apparatus can be reduced by setting it as the structure which extrudes the molten resin sheet vertically downward. This is because, for example, when forming by extruding in the horizontal direction, a separate conveying device for moving the resin sheet in the horizontal direction is required, and the conveying device and the mold are arranged in the horizontal direction with the extruding device. Because it becomes necessary.
In addition, you may make it deform | transform suitably the shaping | molding method of the resin panels of embodiment mentioned above. Hereinafter, modifications of the resin panel molding method of the embodiment will be described.

(Modification 1)
In the above-described method for molding a resin panel, the case where a pair of T dies extrude a molten resin sheet has been described, but a resin sheet may be obtained by extruding while cutting a cylindrical parison.

(Modification 2)
In the resin panel molding method described above, before the pair of split molds 71A and 71B is moved to the closed position, the resin sheet P is sealed between the pair of split molds 71A and 71B. Although the case where the space is formed has been described, the present invention is not limited to this. You may make it form sealed space by moving a pair of split metal mold | die 71A, 71B to a closed position.

(Modification 3)
In the resin panel molding method described above, the case where the air inside the sealed space is sucked in order to press the resin sheet P against the formation surfaces 72A and 72B of the pair of split molds 71A and 71B has been described. Not limited to this. The resin sheet P may be pressed against the formation surfaces 72A and 72B of the pair of split molds 71A and 71B by blowing a fluid such as air onto the resin sheet P (blow molding).

(Modification 4)
In the resin panel molding method described above, the step of pressing the outer layer of the molten resin sheet against the formation surface of the split mold used a method by suction of a sealed space or a method by blow molding. Not limited to. A method of pressing the molten resin sheet against the forming surface of the split mold using the core material 10 without forming the sealed space may be applied. This method will be described with reference to FIGS.
FIG. 18 is a diagram illustrating a state before the core material 10 is pressed against the molten resin sheet. FIG. 19 is a view showing a state after the core material 10 is pressed against the molten resin sheet until it reaches the formation surface of the split mold.

In the method of this modification, first, as shown in FIG. 18, the core material held by the manipulator 120 in a state where the molten resin sheet P is extruded vertically downward (the same state as FIG. 13). 10 is positioned at a position facing the split mold 71B with the resin sheet P interposed therebetween. When the core material 10 is positioned, the manipulator 120 that holds the core material 10 is moved toward the formation surface 72B of the split mold 71B. Then, the core material 10 contacts the molten resin sheet P, and the core material 10 and the resin sheet P are welded. At the time of contact with the core material 10, the molten resin sheet P is kept at a relatively high temperature because it is not in contact with the split mold 71 </ b> B having high thermal conductivity. Therefore, the core material 10 and the resin sheet P are favorably welded.
When the manipulator 120 is further moved and the outer layer of the resin sheet P reaches the formation surface 72B of the split mold 71B, the state shown in FIG. 19 is obtained. At this time, the outer layer of the resin sheet P is pressed against the formation surface 72 </ b> B through the core material 10 by the manipulator 120. Thereafter, the manipulator 120 is removed from the core material 10.

The subsequent steps are as described above.
That is, as shown in FIG. 17, the pair of split molds 71A and 71B are moved from the open position to the closed position and clamped. Thereby, the core material 10 welded to one resin sheet P (right side of the drawing) is also welded to the other resin sheet P (left side of the drawing). Then, the pair of resin sheets are pressed against the formation surfaces 72A and 72B of the split molds 71A and 71B, and as shown in FIG. 15, the shape along the formation surfaces 72A and 72B, that is, the substantially outer shape of the resin panel 1 Formed. Furthermore, in the pinch-off portions 74A and 74B of the pair of split molds 71A and 71B, the peripheral edges of the pair of resin sheets P are welded to form the parting line PL. Finally, the pair of split molds 71A and 71B are moved again to the open position, the molded resin panel 1 is separated from the formation surfaces 72A and 72B, and the burrs formed around the parting line PL are removed with a cutter or the like. Cut and remove. Thus, the resin panel 1 in which the resin sheet Sa, the core material 10, and the resin sheet Sb are laminated is completed.

  The embodiment of the present invention has been described in detail above. However, the resin panel and the manufacturing method of the present invention are not limited to the above embodiment, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, it may be.

In the above-described embodiment, the reinforcing member is arranged in the well-shaped layout in the core member 10, but is not limited to this layout. By changing the shapes of the reinforcing member and the connecting member, two or more reinforcing members can be arranged in different layouts.
As shown in FIG. 2, when the reinforcing members are arranged in a well-shaped layout in the core member 10, the reinforcing members are orthogonal to each other, but can be configured differently. . That is, the angle at which the reinforcing members are connected can be arbitrarily set. For example, the reinforcing material 30 is formed so that the longitudinal direction of the reinforcing material 30 faces in a direction inclined from a direction orthogonal to the end face of the reinforcing material 30. The notch 143 of the connecting member 140 is formed in a direction inclined from a direction orthogonal to the first groove 141 and the second groove 142. By doing so, the angle at which the reinforcing members 30 are connected to each other via the connecting member 140 can be arbitrarily set.

  In the above-described embodiment, the case where the H-shaped extrusion reinforcement is applied as the reinforcing material 30 has been described. However, the shape is not limited to the H shape, and the U-shaped form (in FIG. And a form formed on the second projecting portion 32a side. For example, when a reinforcing material having a T-shape as a whole is incorporated into the core material, another reinforcing material may be abutted against one side of the reinforcing material, so that the H-shaped reinforcing material is not necessarily used. May be.

  In the embodiment described above, the first protrusion 31 a and the second protrusion 32 a are provided on the reinforcing member 30, and the first protrusion 31 a and the second protrusion 32 a are respectively connected to the first groove 141 of the connecting member 140. In addition, the second groove 142 is engaged, but by providing another means for preventing the connecting member 140 from falling off the reinforcing member 30, each protrusion of the reinforcing member 30 and each groove of the connecting member 140 are provided. It may not be provided. For example, a material having high sliding resistance with the reinforcing member 30 may be attached to the surface of the connecting member 140, or the connecting member 140 does not easily fall off and can slide inside the reinforcing member 30. It is good also as a structure which press-fits the connection member 140 to the reinforcement material 30 to such an extent.

1 ... Resin panel Sa, Sb ... Resin sheet (skin sheet)
DESCRIPTION OF SYMBOLS 1a ... Front surface 1b ... Back surface 1c ... Side wall surface 10 ... Core material 20 ... Foam 20a ... Front surface 20b ... Back surface 20c ... Side wall surface 201-209 ... Resin foam material A1-A4 ... Opening D1-D4 ... Groove 230a ... Shallow groove 230b ... Deep groove 211, 221 ... Engagement surfaces 211a and 221a ... Protrusions 212 and 222 ... Stopper 30 ... Reinforcement material 30U ... Upper surface 30L ... Lower surface 30G ... Opening 31 ... Upper surface part 31a ... First protrusion 32 ... Lower surface portion 32a ... Second protrusion 33 ... Supporting portion 140 ... Connecting member 140U ... Upper surface 140L ... Lower surface 140S1 ... First side surface 140S2 ... Second side surface 141 ... First groove 142 ... Second groove 143 ... Notch 50 ... Molding device 50a ... Cavity 41, 42 ... Cooling pipe 43, 44 ... Feeder 51, 52 ... Mold 53, 54 ... Empty room 55, 56 ... Steam injection 57, 58 ... Cooling water inlet 60 ... Extrusion device 70 ... Clamping device 61A, 61B ... T die 65A, 65B ... Roller 71A, 71B ... Split mold 72A, 72B ... Forming surface 73A, 73B ... Vacuum chamber 74A, 74B ... Pinch-off part 75A, 75B ... Sliding part 90 ... Molding device P ... Resin sheet

Claims (2)

A resin panel in which the structure is covered with a resin sheet,
The structure is
Two reinforcing members which are long members and have the same cross-sectional shape;
A connecting member that connects the two reinforcing members so that the two reinforcing members are orthogonal to each other, and the upper surfaces of the two reinforcing members are in the same plane, and the lower surfaces of the two reinforcing members are in the same plane. When,
Equipped with a,
The reinforcing material is along the longitudinal direction,
An upper surface portion having an upper surface of a reinforcing material;
A lower surface portion having a lower surface of a reinforcing material;
A support portion for supporting the upper surface portion and the lower surface portion in the thickness direction;
An opening provided to face the support portion;
With
The connecting member has a rectangular parallelepiped shape as a whole,
An upper surface that comes into contact with the surface on the lower surface side of the pair of surfaces provided on the upper surface portion of one of the two reinforcing materials;
A lower surface in contact with the upper surface of the pair of surfaces provided on the lower surface of the first reinforcing member;
A notch that is orthogonal to the direction in which the first reinforcing material extends and is provided from the upper surface to the lower surface so as to receive the supporting portion of the other second reinforcing material of the two reinforcing materials;
With
Resin panel. It is inserted between the upper surface portion and the lower surface portion of the first reinforcing material from the opening of the first reinforcing material, and is inserted between the upper surface portion and the lower surface portion of the second reinforcing material from the opening of the second reinforcing material. Further comprising a resin foam material,
The resin panel according to claim 1 .

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