JP2020131628A - Metal mold for resin-made sandwich panel and manufacturing method of resin-made sandwich panel - Google Patents

Abstract

To provide a metal mold for a resin-made sandwich panel capable of reducing a gap around a foam core material, and a manufacturing method of the resin-made sandwich panel.SOLUTION: A metal mold 81 for a resin-made sandwich panel includes: a first cavity part 811 formed so as to correspond to a plate surface 13a of a foam core material 13; and a second cavity part 821 which is formed so as to correspond to a rising wall part 13c rising from the plate surface of the foam core material, and is provided capable of approaching and parting with respect to the first cavity part 811 so as to be in contact with the first cavity part 811 via a contact part 850 to form a continuous surface.SELECTED DRAWING: Figure 6

Description

The present invention relates to a mold for a resin sandwich panel and a method for manufacturing a resin sandwich panel.

Conventionally, a resin sandwich panel formed by sandwiching a substantially flat foam core material between two molten resin sheets has been provided. Patent Document 1 discloses a resin sandwich panel in which an outer peripheral space is formed on the outer periphery of the foam core material. The cavity of the mold into which the foam core material is inserted in the manufacturing process of the resin sandwich panel corresponds to the portion corresponding to the flat surface of the flat foam core material and the standing wall portion rising from the plate surface of the foam core material. There is a part to be formed.

Japanese Unexamined Patent Publication No. 2015-1048887

Depending on the application of the resin sandwich panel, it may be required to minimize the space between the foam core material and the molten resin sheet. For example, when strength is required or when it is desired to improve cold insulation performance. In these cases, it is conceivable to manufacture a resin sandwich panel using a foam core material having substantially the same size as the cavity in which the molten resin sheet is shaped. However, the foam core material has a small gap with respect to the molten resin sheet formed in the cavity of the mold, and therefore, particularly in the standing wall portion, the foam core material rubs against the molten resin sheet, resulting in molding defects. There was something.

An object of the present invention is to provide a mold for a resin sandwich panel and a method for manufacturing a resin sandwich panel, which can reduce the gap around the foam core material.

The resin sandwich panel mold of the present invention is formed so as to correspond to a first cavity portion formed corresponding to the plate surface of the foam core material and a standing wall portion rising from the plate surface of the foam core material. It is characterized by having a second cavity portion provided so as to be able to approach and separate from the first cavity portion so that a continuous surface is formed by abutting the first cavity portion via the contact portion.

The method for manufacturing a resin sandwich panel of the present invention is formed by corresponding to a first cavity portion formed corresponding to the plate surface of the foam core material and a standing wall portion rising from the plate surface of the foam core material. With the first cavity portion of the resin sandwich panel mold provided with the second cavity portion provided so as to be approachable and separated from the first cavity portion so as to be in contact with the first cavity portion to form a continuous surface. A cavity separating step of separating the second cavity portion, a molten resin sheet shaping step of shaping the molten resin sheet with respect to the first cavity portion and the second cavity portion, and the foam core material. It is characterized by having a foam core material insertion step of inserting into the first cavity portion and the second cavity portion, and a contact step of moving the second cavity portion so as to abut the first cavity portion. And.

According to the present invention, it is possible to provide a mold for a resin sandwich panel and a method for manufacturing a resin sandwich panel, which can reduce the gap around the foam core material.

It is a schematic diagram which shows the molding apparatus provided with the mold for the resin sandwich panel which concerns on embodiment of this invention. It is a perspective view of the resin sandwich panel which concerns on embodiment of this invention. It is a top view of the cavity of the mold for a resin sandwich panel which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 3 in the cavity of the resin sandwich panel mold according to the embodiment of the present invention. It is sectional drawing of the main part corresponding to the cross section AA of FIG. 3 for explaining the manufacturing method of the resin sandwich panel which concerns on embodiment of this invention, and (a) shows the molten resin sheet shaping process. (B) is a figure which shows the foam core material insertion process. It is sectional drawing of the main part corresponding to the cross section AA of FIG. 3 for explaining the manufacturing method of the resin sandwich panel which concerns on embodiment of this invention, (a) shows the contact process, (b). Is a diagram showing a mold clamping process. It is sectional drawing of the main part corresponding to the AA cross section of FIG. 3, which shows the modification of the resin sandwich panel mold which concerns on embodiment of this invention.

Next, an embodiment of the present invention will be described with reference to the drawings. The molding apparatus 60 shown in FIG. 1 includes a resin supply apparatus 61 having a known configuration and a resin sandwich panel mold 80 arranged below the resin supply apparatus 61. The molding apparatus 60 can manufacture the resin sandwich panel 10 (see FIG. 2).

In the resin supply device 61 of the molding device 60, two units of the first resin supply device 61A and the second resin supply device 61B for molding the molten resin sheet are arranged so as to face each other, and the first molten resin sheet 11 and the second molten resin sheet 11 and the second molten resin sheet are respectively arranged. The resin sheet 12 is molded. The resin supply device 61 includes an extruder 66 that melts and kneads the material supplied from the hopper 65 by a hopper 65 that is a supply port for the resin material and a screw that is connected to the hydraulic motor 68 and is arranged inside. Provided. The extruder 66 is connected to an accumulator 70 including a plunger 72, and the melted and kneaded resin material is sent from the extruder 66 to the accumulator 70. The resin material is sent to the T-die 71 under high pressure by the accumulator 70, the die slit of the T-die 71 is opened at an appropriate timing, and the resin material is sent out by the roller 79 to form the first molten resin sheet 11 and the second molten resin sheet 11. The resin sheet 12 is formed.

The resin material charged into the hopper 65 is a thermoplastic resin made of polyolefin or the like formed in pellet form. Examples of the polyolefin include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer and a mixture thereof. Further, additives such as glass fiber, talc and pigment may be added thereto.

The resin sandwich panel mold 80 includes a first mold 81 and a second mold 82. The resin sandwich panel mold 80 is a so-called multi-piece mold in which a plurality of resin sandwich panels 10 can be molded at one time. In the present embodiment, a large number of molds are used, but a single mold may be used. Further, the mold may be molded at the same time as a plurality of other molded products. Cavities 81a and 82a are formed in the first mold 81 and the second mold 82, respectively. Molds 83 and 84 are formed on the outer circumferences of the first mold 81 and the second mold 82. The molds 83 and 84 move toward the first molten resin sheet 11 and the second molten resin sheet 12 and adsorb the first molten resin sheet 11 and the second molten resin sheet 12. On the other hand, in the first mold 81 and the second mold 82, the molds 83, 84 and the first molten resin sheet 11, the second molten resin sheet 12, the first mold 81, and the cavity 81a of the second mold 82 , A vacuum pump (not shown) for depressurizing the space in 82a is provided.

As shown in FIG. 2, the resin sandwich panel 10 is formed of two molten resin sheets (first molten resin sheet 11 and second molten resin sheet 12) by the above-mentioned resin sandwich panel mold 80. The foam core material 13 and each molten resin sheet are welded to each other by sandwiching the material 13. The resin sandwich panel 10 is formed in a substantially long rectangular shape, and the plate surfaces 10a and 10b to which the first molten resin sheet 11 and the second molten resin sheet 12 are welded are formed as continuous flat surfaces, respectively. .. The vertical wall portion 10c rising from the plate surface 10a and connecting to the plate surface 10b is formed in a laterally curved shape that is convex outward. The vertical wall portion 10d is formed substantially perpendicular to the plate surfaces 10a and 10b.

The foam core material 13 has a shape similar to that of the resin sandwich panel 10. The plate surfaces 13a and 13b of the foam core material 13 correspond to the plate surfaces 10a and 10b of the resin sandwich panel 10, respectively. The vertical wall portions 13c and 13d correspond to the vertical wall portions 10c and 10d.

The foam core material 13 is formed of a resin to which a foaming agent is added. Examples of the resin forming the foam core material 13 include homopolymers or copolymers of olefins such as ethylene, propylene, butene, isoprenepentene, and methylpentene, polyolefins (for example, polypropylene, high-density polyethylene), polyamides, and polystyrenes. , Acrylic derivatives such as polyvinyl chloride, polyacrylonitrile, ethylene-ethylacrylate copolymers, vinyl acetate copolymers such as polycarbonates and ethylene-vinyl acetate copolymers, terpolymers such as ionomers and ethylene-propylene-dienes, Examples thereof include acrylonitrile-styrene copolymer, ABS resin, polyphenylene oxide, polyacetal, phenol resin, polymethacrylimide, and polyetherimide. It should be noted that these may be used alone or in combination of two or more. In particular, by using the same material for the foam core material 13, the first molten resin sheet 11, and the second molten resin sheet 12, it is possible to bond the foam core material 13 by heat welding without using a solvent or the like. The foam core material 13 may contain an additive, and the additive includes an inorganic filler such as silica, mica, talc, calcium carbonate, glass fiber, and carbon fiber, a plasticizer, a stabilizer, and a colorant. Examples thereof include antistatic agents, flame retardants, and foaming agents.

As the foaming agent in the present embodiment, any of a physical foaming agent, a chemical foaming agent and a mixture thereof may be used. As the physical foaming agent, inorganic physical foaming agents such as air, carbon dioxide, nitrogen gas, and water, organic physical foaming agents such as butane, pentane, hexane, dichloromethane, and dichloroethane, and their supercritical fluids are used. be able to. As the supercritical fluid, it is preferable to use carbon dioxide, nitrogen or the like. For nitrogen, the critical temperature is 149.1 ° C. and the critical pressure is 3.4 MPa or more, and for carbon dioxide, the critical temperature is 31 ° C. and the critical pressure is 7. It is obtained by setting the pressure to 4 MPa or more.

Next, the cavity 81a of the first mold 81 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a schematic plan view of the cavity 81a as viewed from the P direction of FIG. FIG. 4 is a cross-sectional view taken along the line AA of FIG. The cavity 81a is provided with a cavity plate 81a1 on which the first cavity 811 is formed and a slide piece 81a2 on which the second cavity 821 is formed. The first cavity portion 811 of the cavity plate 81a1 is formed corresponding to the plate surface 13a (see FIG. 2) of the substantially flat foam core material 13. Therefore, in the present embodiment, the first cavity portion 811 is a continuous flat surface having a substantially long rectangular shape. Ribs 811a are erected from the first cavity portion 811 on the side edge in the longitudinal direction of the first cavity portion 811. The rib 811a is pinched off.

The cavity plate 81a1 has an outer surface 813 formed on the outer side of the rib 811a at the same surface height as the first cavity portion 811. A rectangular recess 814 in which the slide piece 81a2 is arranged is formed on the outer surface 813 of the cavity plate 81a1 near both left and right ends in FIG. A hole 815 penetrating a rectangle is formed in the recess 814. Further, the above-mentioned mold 83 is formed on the outer periphery of the cavity plate 81a1.

The second cavity portion 821 of the slide piece 81a2 is formed corresponding to the standing wall portion 13c (see FIG. 2) rising from the plate surface 13a of the foam core material 13. Therefore, in the present embodiment, the second cavity portion 821 is a curved surface having a concave vertical cross section. Ribs 821a are erected from the second cavity portion 821 on the side edge of the second cavity portion 821. The rib 821a is formed on an extension line extending from the rib 811a of the first cavity portion 811 to have the same width as the rib 811a. On the outer side of the rib 821a, a flat outer surface 825 having substantially the same height as the outer surface 813 of the cavity plate 81a1 is formed. Even when the slide piece 81a2 is moved in the contacting step described later, the first molten resin sheet 11 in the portion corresponding to the second cavity portion 821, particularly the first molten resin in the vicinity of the rib 821a (pinch off). Since it is possible to reduce problems such as the sheet 11 being raised or wrinkled, the width of the slide piece 81a2 is outside the rib 821a of the second cavity portion 821 as in the present embodiment. It is preferable that it extends to the outer surface 825.

The slide piece 81a2 is connected to the cylinder rod 831 of the hydraulic cylinder 830 arranged on the opposite side of the second cavity portion 821. On the other hand, a rectangular recess 822 is formed on the lower surface of the slide piece 81a2. The outer circumference of the recess 822 is formed in a substantially U shape when viewed from below in FIG. 4 (not shown), and is a lower surface 823a that slides on the recess 814. On the other hand, the outer wall portion 823b of the slide piece 81a2 is in sliding contact with the vertical wall of the recess 814. In this way, the slide piece 81a2 is guided by the recess 814 with the lower surface 823a and the outer wall portion 823b sliding in contact with the recess 814 of the cavity plate 81a1 as a slide surface using the hydraulic cylinder 830 as a drive source. Therefore, the second cavity portion 821 of the slide piece 81a2 can be linearly moved in the left-right direction in FIG.

A cover 840 is provided above the slide piece 81a2. The cover 840 includes a plate-shaped end portion 841 and a plate-shaped central portion 842 formed in a U shape when viewed from the left-right direction in FIG. 3 and having a high height. In the slide piece 81a2, the upper surface 824 corresponding to the second cavity portion 821 is in sliding contact with the lower surface of the central portion 842, and the outer surface 825 is in sliding contact with the lower surface of the end portion 841. The rib 824a is erected from the upper surface 824 so as to intersect and connect with the rib 821a on the side edge at the connecting portion between the upper surface 824 of the slide piece 81a2 and the second cavity portion 821.

As described above, the slide pieces 81a2 are formed so as to be movable. That is, the second cavity portion 821 can be approached and separated from the first cavity portion 811. The slide piece 81a2 can move until the second cavity portion 821 comes into contact with the first cavity portion 811. More specifically, the first cavity portion 811 and the second cavity portion 821 have linear edge portions facing each other in contact with each other to form a linear contact portion 850 (see FIG. 6A). When the first cavity portion 811 and the second cavity portion 821 come into contact with each other via the contact portion 850, a continuous surface formed by the first cavity portion 811 and the second cavity portion 821 is formed. At this time, the rib 811a of the first cavity portion 811 and the rib 821a of the second cavity portion 821 are also brought into contact with each other and connected.

Further, in the contact state between the first cavity portion 811 and the second cavity portion 821, a space portion 855 is formed below the contact portion 850 (see FIG. 6A). As shown in FIG. 4, the facing surfaces 816 and 826 of the first cavity portion 811 and the second cavity portion 821 in the space portion 855 are formed in a tapered shape so as to expand each other. Therefore, the space portion 855 is formed in a tapered shape that expands.

Next, a method for manufacturing the resin sandwich panel 10 will be described with reference to FIGS. 4 to 6. Note that FIGS. 5 and 6 show the main parts in the AA cross section of FIG. 3, and in order to make the figure easier to understand, the lines showing some outer surfaces 813 such as ribs 811a and 821a and gaps are omitted. ing.

Cavity separation step: The slide piece 81a2 is retracted to separate the facing edges of the first cavity portion 811 and the second cavity portion 821 to form a gap (FIG. 4).
Molten resin sheet shaping step; As shown in FIG. 5A, the first molten resin sheet 11 is adsorbed by the mold 83, and the cavities of the mold 83, the first molten resin sheet 11 and the first mold 81 are formed. The space surrounded by the 81a is depressurized, and the first molten resin sheet 11 is shaped into the cavities 81a (the first cavity portion 811 and the second cavity portion 821). At this time, the first molten resin sheet 11 enters the gap between the opposite edges of the first cavity portion 811 and the second cavity portion 821.

Foam core material insertion step; As shown in FIG. 5 (b), the foam core material 13 is inserted into the cavity 81a (first cavity portion 811 and second cavity portion 821). At this time, the plate surface 13a of the foam core material 13 is welded to the first molten resin sheet 11 located in the first cavity portion 811. On the other hand, the standing wall portion 13c of the foam core material 13 is separated from the first molten resin sheet 11 located in the second cavity portion 821. Therefore, in this step, the standing wall portion 13c of the foam core material 13 is not welded to the first molten resin sheet 11.
In addition, between the vertical wall portion 10d of the foam core material 13 and the molten resin sheet 11 (in other words, between the rib 811a and the molten resin sheet 11 in the standing wall portion 10d of the foam core material 13 facing the rib 811a). There is a gap (not shown).

Contact step; As shown in FIG. 6A, the slide piece 81a2 is advanced (hereinafter, the direction in which the slide piece 81a2 is directed toward the cavity plate 81a1 is referred to as "advance", and the direction in which the slide piece 81a2 is separated is referred to as "retracted"). 2 The front end edge of the cavity portion 821 is brought into contact with the edge portion of the first cavity portion 811. Therefore, the gap formed between the first cavity portion 811 and the second cavity portion 821 disappears. Then, the first molten resin sheet 11 that has entered the gap is sandwiched between the contact portion 850 where the first cavity portion 811 and the second cavity portion 821 come into contact with each other. The first molten resin sheet 11 below the contact portion 850 is located in the space portion 855 below the contact portion 850. Then, as the slide piece 81a2 advances, the first molten resin sheet 11 located in the second cavity portion 821 is pressed against the standing wall portion 13c of the foam core material 13. Therefore, the welding of the standing wall portion 13c with the first molten resin sheet 11 is firmly bonded.

Here, the dimensions of the cavity 81a in a state where the slide piece 81a2 is advanced and the first cavity portion 811 and the second cavity portion 821 are in contact with each other are the same as the dimensions of the portion of the foam core material 13 corresponding to the cavity 81a. More preferably, it is set to the lower limit of the dimensional tolerance of the foam core material 13 (the lower limit of the product size of the foam core material 13). As a result, it is possible to prevent a gap between the standing wall portion 13c of the foamed core material 13 and the first molten resin sheet 11. Since the foam core material 13 is easily melted by contact with the molten resin sheet, even if the foam core material 13 has a larger tolerance than the cavity 81a, the size of the final product resin sandwich panel 10 is not affected. Absent.

Molding step: As shown in FIG. 6B, the first mold 81 and the second mold 82 of the resin sandwich panel mold 80 are combined to perform mold clamping. A second molten resin sheet 12 shaped in the cavity 82a is sandwiched between the cavity 82a of the second mold 82 and the foam core material 13, and the second molten resin sheet 12 and the plate surface 13b are welded together. To.
Product take-out step; The foam core material 13 to which the first molten resin sheet 11 and the second molten resin sheet 12 are welded is taken out from the resin sandwich panel mold 80. Here, the first molten resin sheet 11 sandwiched between the abutting portions 850 and located in the gap is formed as the burr 11a at the position shown by the alternate long and short dash line in FIG. The burrs 11a are removed together with burrs formed at other sites.

In this way, the foam core material 13 and the first molten resin sheet 11 are firmly welded not only to the plate surfaces 13a and 13b of the foam core material 13 but also to the standing wall portion 13c, so that the standing wall portion 13c and the first molten resin sheet 11 are melted. The resin sandwich panel 10 which is a product is formed without forming a space between the resin sheet 11 and the resin sheet 11. Since the welding of the standing wall portion 13c and the first molten resin sheet 11 is performed by moving the slide piece 81a2 forward, there is no place where the foam core material 13 and the first molten resin sheet 11 are in sliding contact with each other, and thus the first molten resin. Molding defects such as wrinkles and tears caused by the sheet 11 being rubbed by the foam core material 13 are reduced. The forward movement of the slide piece 81a2 may cause wrinkles on the first molten resin sheet 11 corresponding to the outer surface 825 of the slide piece 81a2, but this part is the outer part of the second cavity portion 821 and is the product. Since it is a portion (ie, burr), it is removed after the above product removal step.

In the present embodiment, the plate surface 13a of the foam core material 13 is formed flat, and the standing wall portion 13c is formed by being curved. Then, more specifically, the first cavity portion 811 is formed in a flat surface shape corresponding to the plate surface 13a, and the second cavity portion 821 is connected to the plate surface 13b from the bending start portion curved from the plate surface 13a. It is formed corresponding to the vertical wall portion 13c extending over the site. As a result, it is possible to more reliably reduce the rubbing between the foam core material 13 and the first molten resin sheet 11 in the forward movement of the slide piece 81a2.

Next, a modified example of this embodiment will be described with reference to FIG. In this modification, instead of the foam core material 13 in the above-described embodiment, the foam core material 13A has a plate surface 13Ab formed in a U shape and has a wall portion 13Ae. In line with this, the second mold 82 is a mold 82A having a cavity 82Aa having a shape corresponding to the plate surface 13Ab and the wall portion 13Ae. In this modified example as well, the first molten resin sheet 11 is welded to the vertical wall portion 13c on the outer periphery of the foam core material 13A without any gaps. On the other hand, a space S is formed between the wall portion 13Ae of the U-shaped plate surface 13Ab of the foam core material 13A and the second molten resin sheet 12.

Although the embodiment of the present invention has been described above, the present invention is not limited to the present embodiment and can be implemented with various modifications. For example, the movement of the slide piece 81a2 is not limited to the hydraulic cylinder 830 used in the present embodiment, and a motor or other actuator in which a ball screw is connected to the drive shaft can also be used. Further, the moving direction of the slide piece 81a2 is the horizontal direction in the present embodiment, but it may be the vertical direction (the vertical direction of the resin sandwich panel mold 80).

Further, although the standing wall portion 13c of the foam core material 13 is formed in a curved shape in the present embodiment, it may be formed in a right angle or an inclined shape with respect to the plate surfaces 13a and 13b, or an uneven surface or the like may be formed. You may have it. Further, the plate surfaces 13a and 13b may be provided with convex portions and concave portions as appropriate. Further, the plate surfaces 13a and 13b may be a convex or concave curved surface or a spherical surface. That is, the plate surface of the foam core material is a surface where the foam core material is pressed against the first cavity portion and welded to the molten resin sheet. Further, the standing wall portion of the foam core material means a side surface portion formed around the plate surface of the foam core material, in other words, a second cavity portion in which a molten resin sheet is formed is pressed against the foam core material. The part that is made. Therefore, the foam core material is not limited to a substantially flat plate shape, and can be in various forms such as a rod shape, a spherical shape, and a block shape.
The present invention is particularly useful as a resin sandwich panel that includes a portion of the standing wall portion having a rising inclination angle (tangent in the case of a curved surface) of 45 degrees or more, more preferably 60 degrees or more.
If the temperature is less than 45 degrees, it is possible to mold without using a slide piece, and it is difficult for the pressing force when pressing from the side surface to be transmitted to the foam core material.
Further, the height of the standing wall portion is preferably 10 mm or more and 500 mm or less, and more preferably 100 mm or more and 300 mm or less.
Since the plate thickness of the standing wall portion of less than 10 mm is thin, the effect of pressing from the side surface is weak.
A standing wall portion of 500 mm or more has poor moldability.

10 Resin sandwich panel 10a, 10b Plate surface 10c, 10d Standing wall part 11 1st molten resin sheet 11a Bali 12 2nd molten resin sheet 13 Foam core material 13a, 13b, 13Ab Plate surface 13c, 13d Standing wall part 13Ae Wall part 60 molding Equipment 61 Resin supply device 61A 1st resin supply device 61B 2nd resin supply device 65 Hopper 66 Extruder 68 Hydraulic motor 70 Accumulator 71 T die 72 Plunger 79 Roller 80 Resin sandwich panel mold 81 1st mold 81a Cavity 81a1 Cavity plate 81a2 Slide piece 82 2nd mold 82a Cavity 83, 84 Mold frame 811 1st cavity 811a Rib 813 Outer surface 814 Recess 815 Hole 816 Opposing surface 821 2nd cavity 821a Rib 822 Recess 823a Lower surface 823b Outer side wall 824 Top surface 824a Rib 825 Outer surface 826 Facing surface 830 Hydraulic cylinder 831 Cylinder rod 840 Cover 841 End part 842 Central part 850 Contact part 855 Space part

Claims (5)

A first cavity formed corresponding to the plate surface of the foam core material,
It is formed corresponding to the standing wall portion rising from the plate surface of the foam core material, and approaches the first cavity portion so that a continuous surface is formed by abutting with the first cavity portion via the contact portion. A second cavity that can be separated from each other
A mold for a resin sandwich panel, which is characterized by having. The resin sandwich panel metal according to claim 1, wherein the contact portion is formed by a flat surface end portion of the first cavity portion and a rising start portion of the second cavity portion. Type. The resin sandwich according to claim 1 or 2, wherein a space portion is formed below the contact portion in a contact state between the first cavity portion and the second cavity portion. Panel mold. The resin sandwich panel mold according to claim 3, wherein the facing surfaces of the first cavity portion and the second cavity portion in the space portion are formed in a tapered shape. A first cavity portion formed corresponding to the plate surface of the foam core material and a standing wall portion rising from the plate surface of the foam core material are formed, and a continuous surface is formed in contact with the first cavity portion. A cavity that separates the first cavity portion and the second cavity portion of a resin sandwich panel mold having a second cavity portion that is provided so as to be able to approach and separate from the first cavity portion. Separation process and
A molten resin sheet shaping step of shaping the molten resin sheet with respect to the first cavity portion and the second cavity portion, and
A foam core material insertion step of inserting the foam core material into the first cavity portion and the second cavity portion, and
A contact step of moving the second cavity portion so as to contact the first cavity portion, and
A method for manufacturing a resin sandwich panel, which comprises.

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