JP3727435B2 - Flat thermoplastic resin foam having a wooden board disposed on the side surface, a method for producing the same, and a mold for foam molding used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat thermoplastic resin foam in which a wooden board is disposed on a side surface portion used as a thermal insulation panel for buildings, a method for producing the same, and a foam molding die used therefor.
[0002]
[Prior art]
Conventionally, a thermal insulation panel having a wooden board disposed on a side surface is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-238761, in which a wooden board is disposed on a side surface of a panel frame that is open at least on one side. A method is disclosed in which a panel frame and a foamed resin molded body are integrally formed by heating and foaming the pre-expanded particles after the pressure-holding and filling the pre-expanded particles in the panel frame. .
[0003]
[Problems to be solved by the invention]
However, in the method for manufacturing a thermal insulation panel for building described in the above-mentioned Japanese Patent Application Laid-Open No. 6-238661, water vapor and water are respectively applied to the upper pressure plate and the metal box so that the foam can be uniformly and uniformly foamed even on a wide surface. It has a structure equipped with a device for introducing cooling water.
Therefore, in order to obtain a large area thermoplastic resin foam molded article, the entire apparatus had to be enlarged. For example, in order to form a wide building panel with a length of about 2 to 5m for roof panels and floor panels, foaming is uniformly performed without any spots. A mouth must be provided, and therefore foam molding equipment for forming wide building panels has become a very expensive device.
Further, in the method described in the above publication, after the integral molding of the frame material and the thermoplastic resin foam molded body, the foamed resin molded body contracts due to a change over time due to cooling, and the frame material and the foamed resin molded body. As a result, a problem arises in that the heat insulation effect is reduced.
[0004]
[Means for Solving the Problems]
As a result of intensive studies in view of such problems, the present inventor can foam without any spots even in a large area. Acquired knowledge that this can be achieved by providing a water vapor supply port / drain port on the side surface and drilling a hole in the wood board disposed on the side surface that matches the water vapor supply port / drain port. Thus, the present invention has completed a flat thermoplastic resin foam in which a wooden board is disposed on a side surface portion of the present invention, a method for producing the same, and a foam molding die used therefor.
[0005]
That is, the manufacturing method of the flat thermoplastic resin foam in which the wooden board is disposed on the side surface according to the present invention is the method of manufacturing the flat thermoplastic resin foam in which the wooden board is disposed on the side surface. is formed from a metal frame constituting the metal plate and side portions constituting the upper and lower surface portions as mold, using a mold to form a steam supply port and a drain port in the opposite side portions of the metal frame, is the wood plate A wood board in which an adhesive layer is formed in advance on the side in contact with the pre-expanded particles, and the steam supply port / drain port is provided in the hole of the wood board. After the arrangement, the thermoplastic resin pre-expanded particles are supplied into the mold , the exhaust process is performed, and then the main heating process of supplying steam is performed to fuse the pre-expanded particles by steam heating. It is characterized by.
In addition, the manufacturing method of the flat thermoplastic resin foam in which the wooden board is disposed on the side surface, which is another aspect of the present invention, manufactures the flat thermoplastic resin foam in which the wooden board is disposed on the side surface. In this method, a foam metal mold is formed from a metal plate constituting the upper and lower surface portions and a metal frame constituting the side surface portion, and a steam supply port 5a and drain port 5b are formed on the opposite side surface portions of the metal frame. Using a mold, the wooden board is a wooden board in which an adhesive layer is previously formed on the side in contact with the pre-expanded particles, and a wooden board having a hole in the side surface of the mold is formed in the hole of the wooden board. After the steam supply port 5a and the drain port 5b are arranged together, the thermoplastic resin pre-expanded particles are supplied into the mold, and the vapor is supplied from the steam supply port 5a, while the vacuum is supplied from the other drain port 5b. The first exhaust step of sucking is performed, and then the drain port 5b A second evacuation step of supplying steam from the vapor supply port 5a side, and then performing a main heating step of supplying steam from the vapor supply port 5a side and the drain port 5b side, It is characterized by being fused.
Furthermore, the mold for foam molding for producing a plate-like thermoplastic resin foam in which a wooden board is disposed on the side surface, which is another aspect of the present invention, includes a metal plate and side surfaces constituting the upper surface and the lower surface portion. And a steam supply port / drain port for supplying steam and vacuum suction is formed on the opposite side surfaces of the metal frame.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
First, a flat thermoplastic resin foam in which a wooden board is disposed on a side surface portion of the present invention, a method for producing the same, and an embodiment of a foam molding die used therefor will be specifically described below with reference to the drawings.
[I] Mold for Foam Molding (1) Mold Structure Mold for mold molding 2a for producing the flat thermoplastic resin foam 1 in which the wooden boards 18a and 18b are disposed on the side surface of the present invention is as follows. As shown in the foam molding apparatus I in FIG. 1, a metal plate (hereinafter referred to as an upper metal plate) 2a constituting an upper surface portion and a metal plate (hereinafter referred to as a lower metal plate) 2b constituting a lower surface portion on the upper and lower surface portions thereof. The flat upper and lower metal plates 2a and 2b are appropriately provided with beams for preventing deflection in the vertical and horizontal directions. The upper and lower metal plates 2a and 2b are made of aluminum. Iron, etc. can be used. The outer sides of the upper and lower metal plates 2a and 2b are usually covered with heat insulating materials 3a and 3b in order to prevent heat dissipation.
[0007]
A metal frame 2c (hereinafter referred to as a metal frame) constituting a side surface portion of a foam molding die 2 for producing a flat thermoplastic resin foam 1 in which wood plates 18a and 18b are disposed on side surface portions of the present invention is as follows. As shown in FIG. 4, a substantially rectangular metal frame 2c provided with the supply port 5a and drain port 5b on the opposite side surfaces, and the material thereof can be aluminum, iron or the like.
The outer sides of the metal plates 2a, 2b and the metal frame 2c constituting the upper and lower surface portions are usually covered with a heat insulating material 3b in order to prevent heat dissipation, but the metal plates 2a, 2b and In order to prevent heat dissipation to the metal frame 2c, it is preferable to provide the heat insulating layers 4a and 4b on the inner side. By providing the heat insulating layers 4a and 4b on the inner side in this way, utility can be reduced. As a material used for the heat insulation layers 4a and 4b, for example, a sheet of 3 to 10 mm such as butyl rubber, bakelite, or silicon rubber can be used.
[0008]
(2) Actuating equipment On both sides of the upper metal plate 2a of the foam molding die 2 for producing the flat thermoplastic resin foam 1 in which the wooden plates 18a and 18b are disposed on the side surface portion of the present invention. As shown in FIG. 1, it is possible to use a structure in which an upper metal plate actuating cylinder 6 for opening and closing is opened and closed. The upper metal plate actuating cylinder 6 may be a pneumatic or hydraulic one.
It is possible to use a structure in which a base is provided on the lower side of the lower metal plate 2b of the foam molding die 2 of the present invention, and a release pin 7 is attached to the lower metal plate 2b. The release pin 7 can be operated by a pneumatic or hydraulic cylinder 8.
Further, a filling air feeder 10 for filling the thermoplastic pre-expanded particles 9 is attached to the lower metal plate 2b.
The metal frame 2c has a structure that can be fixed to the lower metal plate 2b, and the steam supply port 5a and drain port 5b may be either a chamber system or a pipe system, but can easily handle other types of metal frames 2c. The pipe method is preferable because it can be easily cooled by vacuum suction.
[0009]
The chamber is attached to the opposite side surfaces of the metal frame 2c, and has a steam port 5a and a drain port 5b on the metal frame 2c for supplying steam and vacuum suction. As the steam port 5a and the drain port 5b, those provided with core vents 12 having slits 11 and conical holes smaller than the thermoplastic pre-expanded particles 9 at appropriate intervals can be used.
As shown in FIG. 2, the steam supply pipe 13 and the drain pipe 14 can be used as the steam supply pipe 13 or the drain pipe 14 depending on the piping connection method. The nozzle tip portions 13a and 13b can be inserted from the side surface portion of the metal frame 2c and mounted in the mold 2.
The interval between the pipes 13 and 14 is preferably 100 to 400 mm, and the diameter of the pipes 13 and 14 is preferably 10 to 30 mm. A hole is provided in a corresponding part of the metal frame 2c.
As shown in FIG. 1, the upper and lower metal plates 2 a and 2 b have locking portions 15 a and 15 b that can fix both, and the lock pin 16 can be inserted and fixed from the side by the lock pin operating cylinder 17. ing.
[0010]
(3) Molding material As a material used in the production of the plate-like thermoplastic resin foam 1 in which the wooden plates 18a and 18b are disposed on the side portions of the present invention, the wooden plate 18a is disposed inside the metal frame 2c of the foaming mold 2. , 18a or wooden boards 18b, 18b, or a wooden frame 18 in which the wooden boards 18a, 18a and wooden boards 18b, 18b are arranged, and a plywood 19 or the like is installed inside the upper and lower metal plates 2a, 2b. Although it can be integrally formed with the foam 1, it is necessary to have a hole 12 corresponding to a portion corresponding to the steam supply port 5 a, the drain port 5 b, and the pre-expanded particle 9 filling port. Also, if there is a possibility that the wooden board 18a, 18a, the wooden board 18b, 18b, the wooden frame 18 on which the wooden boards 18a, 18a, 18b, 18b are arranged, or the plywood 19 will move, temporarily fix it with double-sided tape or the like It is preferable to keep it.
[0011]
When using a wooden frame 18 that is open on one side instead of the wooden frame 18 surrounded by the periphery as shown in FIG. 4, or when using the wooden boards 18a and 18a only on one opposing surface, free foaming is performed. The body surface tends to warp inward due to contraction. In such a case, it is preferable to make the corresponding surface of the metal frame 2c convex.
These wooden boards 18a, 18a, wooden boards 18b, 18b, wooden frame 18, or plywood 19 are coated with an adhesive in advance by brushing or the like on the side in contact with the pre-foamed particles 9, thereby forming an adhesive layer 20. To use. As the adhesive, epoxy-based, urethane-based, vinyl acetate-based, recycled rubber-based, synthetic rubber-based solvent-based adhesives, acrylic-based, vinyl acetate-based SBR-based aqueous dispersion adhesives, and the like can be used. The coating amount, 40~150g / m ² is preferred.
As the pre-expanded particles 9, thermoplastic resin pre-expanded particles 9 such as polystyrene, polypropylene and polyethylene can be used. The expansion ratio of the pre-expanded particles 6 is preferably 5 to 100 times.
[0012]
[II] Manufacture of a flat thermoplastic resin foam with a wooden board on the side (1) Install a wooden frame, pre-expanded particles filled The upper metal plate 1a is opened upward in the upper metal working cylinder 6 The wooden plates 18a, 18a, 18b, 18b, 18c, the wooden frame 18, the plywood 19 and the like are appropriately arranged, and the upper metal plate 2a is closed and fixed with the lock pins 16. Next, the pre-expanded particles 9 are filled with the filling air feeder 10.
[0013]
(2) While supplying steam from one steam supply port 5a of the foam-molded metal frame 1c, the first evacuation step of vacuum suction from the other drain port 5b is performed, and then steam is supplied from the drain port 5b side. Then, the second exhausting step of vacuum suction from the steam supply port 5a side is performed.
Next, a main heating step of supplying steam from the steam supply port 5a side and the drain port 5b side is performed to fuse the pre-expanded particles 9 together. Finally, a cooling step is performed in which vacuum suction is performed from both sides.
The time required for each process is 30 to 120 seconds for the first exhaust process, 30 to 120 seconds for the second exhaust process, 60 to 120 seconds for the main heating process, and 30 to 60 seconds for the cooling process.
After molding (in the case of a pipe system, the pipe is usually removed), the lock pin 16 is removed, the upper metal plate 1a is opened, and then the flat thermoplastic resin foam molded body 1 is lifted upward by the release pin 7. In this state, the roller 21 is inserted from the longitudinal direction, the release pin 7 is lowered, and the flat thermoplastic resin foam molding 1 is placed on the roller 21. Thereafter, after being placed on the moving roller conveyor 22, it is carried out to a curing place by a lifter or the like and cured.
[0014]
[III] Flat thermoplastic resin foam (1) having a wooden plate disposed on its side surface (1) Structure In the production of the flat thermoplastic resin foam 1 having wooden plates 18a and 18b disposed on the side surface of the present invention. As shown in FIGS. 5 (a) and 5 (b) and FIGS. 6 (a) and 6 (b), the flat plate-like thermoplastic resin foam 1 in which the wooden plates 18a and 18b are arranged on the manufactured side surfaces is provided on the side surface. The holes 12 are formed in the wooden boards 18a and 18a and / or the wooden boards 18b and 18b arranged in the section.
The holes 12 formed in the wooden boards 18a and 18a and / or the wooden boards 18b and 18b serve as a water supply port 5a and a drain port 5b supplied when the pre-expanded particles 9 are foam-molded during the manufacturing process. Used.
[0015]
Since the size of the hole 12 is used as the water supply port 5a and the drain port 5b, it is only necessary to supply water vapor or discharge water, and generally has a size of 6 to 30 mm, preferably 8 to 25 mm. is there. It is particularly preferable that the hole 12 has a size of 6 to 30 mmφ through which the water vapor supply pipe 13 and the drain pipe 14 can be inserted. Moreover, the number can be opened as needed.
As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the wooden boards 18a and 18a or the wooden boards 18b and 18b in which the holes 12 are formed are arranged on opposite side parts. It is installed.
Further, as shown in FIG. 5 (a), the plate-like thermoplastic resin foam 1 can be made into a wooden frame 18 by arranging wooden boards 18a, 18a, 18b, 18b over the entire side surface. As shown in FIGS. 5 (a) and 6 (a), a wooden board 18c may be disposed at the center of the wooden boards 18a, 18a. Further, as shown in FIG. 5A, a plywood 19 can be disposed on the upper surface portion and / or the lower surface portion thereof.
An adhesive layer 20 may be provided between the wooden boards 18 a and 18 b and the flat thermoplastic resin foam 1, or between the plywood 19 and the flat thermoplastic resin foam 1.
[0016]
(2) Application The plate-like thermoplastic resin foam 1 in which the wood plates 18a and 18b are arranged on the side portions thus obtained has a large number of holes in the side plates of the wood plates 18a and 18a or the wood plates 18b and 18b. Although it is perforated, an adhesive layer 20 is provided between the wooden boards 18a, 18a or 18b, 18b and the flat plate-like thermoplastic resin foam 1 so as to be firmly bonded. Even after the thermoplastic resin foam 1 contracts, there are no gaps between them, and there are many holes 12 in the side surface, but it is fixed with other wood such as pillars and nails. Since it can be used, it can be used as an insulation panel for construction, a formwork panel, and the like.
[0017]
【Example】
Hereinafter, an Example is described based on FIGS.
Example 1
In order to mold the heat insulating panel shown in FIG. 5A, a wooden frame 18 having the following specifications shown in FIG. 4 is placed in the foam molding die 1 having the following specifications shown in FIG. After putting the plywood 19 on, the mold is closed, pre-expanded particles 9 having the following specifications are filled, and foam molding is performed according to the following procedure. Evaluation was made by the following method.
[0018]
Mold for foam molding The mold for foam molding is made of aluminum for both the upper and lower metal plates 1a and 1b. The inner dimensions of the metal frame 1c are width 910mm, length 1,500mm, and thickness 117mm. A chamber for supplying steam and vacuum suction is provided on the opposite side surfaces of the metal frame 1c in the length direction, and the core vent 12 shown in FIG. 7: manufactured by Bilsom Nippon Stone (trade name: brass vent hole) slit 11 width A metal frame 1c in which 0.3 mm and a size of 30 mmφ were driven at intervals of 40 mm was used.
[0019]
Plywood and wooden frame As shown in FIGS. 5 (a) and (b), the plywood 19 used was a commercially available plywood cut with a width of 910 mm, a length of 1,820 mm, and a thickness of 12 mm.
The longitudinal wooden boards 18a and 18a use cedar boards, width 105mm, length 1,500mm, and thickness 30mm, and the steam supply port 5a and drain port 5b have the same position as the core vent 12 of the metal frame 1a. What used the hole part 12 opened by 40 mm space | interval was used. The wooden plates 18b and 18b in the short direction are made of the same material and have a length of 850 mm and are arranged at a pitch of 500 mm.
[0020]
Adhesion layer On the surface where the plywood 19 and the wooden frame 18 are in contact with the pre-expanded particles, a chloroprene rubber solvent type adhesive (trade name: G17) manufactured by Konishi Co., Ltd. is applied with a spatula at 50 g / m ^2. And dried at room temperature for 30 minutes.
[0021]
Pre-expanded particles As the pre-expanded particles, expanded polystyrene resin (trade name: Styropol JF-200) manufactured by Mitsubishi Chemical BSF Co., Ltd. was used 50 times.
[0022]
Closing the valve 23 and 26 adult forms (1) first and second exhaust process foam molding apparatus shown in Figure 1, by opening the valve 24 and 25, vacuum suction from the valve 25 while supplying the steam from the valve 24 After performing the first evacuation process for 60 seconds, the valves 24 and 25 are closed, the valves 23 and 26 are opened, and the second evacuation process in which vacuum suction is performed from the valve 23 while supplying water vapor from the valve 26 is performed for 60 seconds. did.
(2) Main Heating Step Next, the main heating step of closing the valve 23, opening the valve 24, and supplying steam from the valves 24 and 26 was performed for 60 seconds.
(3) Cooling step Next, a cooling step of closing the valves 24 and 26, opening the valves 23 and 25, and performing vacuum suction from the valves 23 and 25 was performed for 60 seconds.
[0023]
3. Removal of molded body As shown in FIG. 3, the upper metal plate actuating cylinder 6 is actuated to raise the upper metal plate 1a to open the mold, and the release pin 7 is actuated upward to perform foaming. The roller 21 was passed between the molded body and the metal frame 1c, pulled out of the mold 1, placed on the moving roller conveyor 22, and then transferred to a lifter and carried to a predetermined storage location.
[0024]
Evaluation The foamed molded article 1 was visually evaluated. As a result, the foamed molded body 1 was satisfactory as a heat insulating panel for construction because the plywood 19 and the wooden frame 18 and the foamed particles 1 were sufficiently adhered, and there was no gap between the foamed particles 1.
[0025]
Example 2
As shown in FIGS. 6A and 6B, the heat insulating panel (width 910 mm, length 1000 mm, thickness 105 mm) was molded in substantially the same manner as in Example 1 except that the following items were changed.
[0026]
Metal frame As shown in FIG. 6 (b), holes of 12mmφ are formed at 250mm pitch on the opposite side surfaces of the metal frame 1c in the longitudinal direction, and a copper pipe is inserted as shown in FIG. The steam supply port 5a and the drain port 5b were used.
A copper pipe having an inner diameter of 10 mmφ, an insertion length into the mold 1 of 350 mm, and a conical hole of 0.5 mmφ formed on the side surface portion at a pitch of 30 mm was used.
[0027]
Wood board A wood board 18a similar to that of Example 1 was used except that the material was a slat and the length was 1,000 mm. The side plates 18a on both sides were used by forming a 12mmφ hole in a portion corresponding to the steam supply port 5a and the drain port 5b of the metal frame 1c, and applying the adhesive 20 on the side in contact with the foam molded body particles 1. . About the center gutter 19b, the adhesive 20 was apply | coated and used on both surfaces.
[0028]
Formed form <br/> molding time is 120 seconds in the first exhaust step and a second evacuation step both the heating step 120 seconds, was cooled process 60 seconds.
[0029]
Evaluation The obtained molded body was the same as in Example 1, in which the adhesion between the wooden boards 18a, 18a, 18c and the foam molded body particles 1 was sufficient, and the foam molded body except for the trace of the copper pipe was used. There was no gap between the particles 1, but the free foam surface was slightly warped inward.
[0030]
Example 3
Inside the upper and lower metal plates, a sheet of 10 mm thick made of butyl rubber is provided as a heat insulation layer. The molding time is 60 seconds for both the first exhaust process and the second exhaust process, the gold generating process 60 seconds, and the cooling process 30 seconds. The same procedure as in Example 2 was performed except that the procedure was performed in step 2.
[0031]
【The invention's effect】
According to the mold for foam molding and the method for molding a thermoplastic resin foam according to the present invention, a large foam molded body such as a heat insulating panel for building is formed with a steam supply port and a drain port on opposite side surfaces. Thus, a simple and inexpensive foam molding die can be obtained, and the obtained thermoplastic resin foam can be obtained as an integrally molded body exhibiting excellent adhesiveness with a wooden frame, plywood and the like. .
[Brief description of the drawings]
FIG. 1 is a front view of a foam molding apparatus used in an example of the present invention.
FIG. 2 is a front sectional view of the foam molding die used in the embodiment of the present invention during foam molding.
FIG. 3 is a schematic view of an apparatus for taking out a molded body in a foam molding die used in an embodiment of the present invention.
FIG. 4 is a layout view of a metal frame and a wooden frame of a foam molding die according to an embodiment of the present invention.
5 (a) is a perspective view of a heat insulating panel molded article for building which is foam-molded in the embodiment of the present invention, and FIG. 5 (b) shows the dimensions of holes formed in a wooden frame. FIG.
6 (a) is a perspective view of a building heat insulation panel molded body foam-molded in the embodiment of the present invention, and FIG. 6 (b) represents the size of a hole formed in a wooden frame. FIG.
FIG. 7 is a perspective view of a core vent used in an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS I Foam molding apparatus 1 Flat thermoplastic resin foam molding 2 Foam molding die 2a Upper metal plate 2b Lower metal plate 2c Metal frame 3a, 3b Thermal insulation material 4a, 4b Thermal insulation layer 5a Steam supply port 5b Drain port 6 Upper metal Plate cylinder 7 Mold release pin 8 Cylinder 9 Thermoplastic pre-expanded particles 10 Filling air feeder 11 Slit 12 Core vent 13 Steam supply pipe 14 Drain pipe 15a Upper lock lock 15b Lower lock lock 18 Wooden frames 18a, 18b , 18c, wood board 19 plywood 20 adhesive layer 21 roller 22 moving roller conveyor 23, 24, 25, 26 valve

Claims (5)

In a method for producing a flat thermoplastic resin foam in which a wooden plate is disposed on a side surface portion, the metal plate is formed from a metal plate constituting an upper and lower surface portion and a metal frame constituting a side surface portion as a foam molding die. Using a metal mold in which a steam supply port and a drain port are formed on the opposite side surfaces of the frame, the wooden board is a wooden board in which an adhesive layer is previously formed on the side in contact with the pre-foamed particles. after the hole has disposed the wood plate is drilled to fit the steam supply port and a drain port into the hole of the wooden plate, by supplying the thermoplastic resin pre-expanded particles into a mold, the exhaust process And then performing a main heating step of supplying steam to fuse the pre-expanded particles. In a method for producing a flat thermoplastic resin foam in which a wooden plate is disposed on a side surface portion, the metal plate is formed from a metal plate constituting an upper and lower surface portion and a metal frame constituting a side surface portion as a foam molding die. A metal plate in which a steam supply port 5a and a drain port 5b are formed on opposite side surfaces of the frame is used, and the wooden plate is a wooden plate in which an adhesive layer is previously formed on the side in contact with the pre-foamed particles. After the wood plate having a hole in the part is disposed with the steam supply port 5a and the drain port 5b aligned with the hole in the wood plate, the thermoplastic resin pre-expanded particles are supplied into the mold, While supplying steam from the steam supply port 5a, the first exhausting step of vacuum suction from the other drain port 5b is performed, then steam is supplied from the drain port 5b side and vacuum suction is performed from the steam supply port 5a side. The second exhaust process is performed, and then the steam supply port 5 Wherein the fusing said pre-expanded particles were present heating step of supplying a steam from the side and the drain port 5b side, the manufacturing method of flat thermoplastic resin foam wooden board is disposed on the side surface. Before supplying the thermoplastic resin pre-expanded particles into the mold, a plywood is disposed on the upper surface portion and / or the lower surface portion of the mold, and the wooden board is disposed on the side surface portion according to claim 1 or 2 . A method for producing a flat thermoplastic resin foam. Plywood, advance pre plywood forming an adhesive layer on the side in contact with the foam particles, method for producing a plate-shaped thermoplastic resin foam wooden board is disposed on a side surface portion of claim 3. Consists of a metal plate that constitutes the upper and lower surfaces and a metal frame that constitutes the side surface, and forms a steam supply port and drain port for supplying and vacuuming steam to the opposite side surfaces of the metal frame A foam molding mold for producing a flat thermoplastic resin foam having a wooden plate disposed on a side surface portion.

Images