JP7079488B2 - Foam resin molding mold and foam resin molding method - Google Patents

Description

The present invention relates to a foamed resin molding die that is filled with foamed beads after pre-foaming and molded into a constant shape, and a foamed resin molding method.

Conventionally, a foamed resin product has been manufactured through a foaming resin polymerization step, a preliminary foaming step, and a molding step. Examples of the foamed resin material include polystyrene, polyolefin, polypropylene, polyethylene and the like. Hereinafter, a case where polystyrene is used as the foamed resin material will be described. In the polymerization step, a polystyrene monomer (a raw material of polystyrene purified from petroleum) is polymerized, and a foaming agent is added to form raw material beads having a diameter of about 0.3 to 1.0 mm. In the pre-foaming step, the raw material beads are pre-foamed and expanded by applying steam at about 100 ° C. to form foamed beads having a diameter of about 2.0 to 5.0 mm. Hereinafter, the term "foamed beads" refers to beads after pre-foaming.

The formation of the molded body by the molding process is formed by the space formed between the first configuration type having a concave surface, the second configuration type covering the concave surface of the first configuration type, and the first configuration type and the second configuration type. It is performed by a foamed resin molding die provided with a molding chamber. The molding process using the foamed resin molding mold includes a filling step of filling the molding chamber with foamed beads, a single-sided heating step of applying heated steam (superheated steam) to the first configuration type or the second configuration type, and the first configuration type and the second configuration type. A double-sided heating process in which heated steam is applied to the configuration mold, a water cooling process in which the first configuration mold is cooled by cooling water, a vacuum suction process in which the molding chamber is vacuum-sucked and cooled, and a mold removal process in which the molded body is taken out from the molding chamber. It consists of processes.

FIG. 13 shows a foamed resin molding mold 100 as an example of a conventional foamed resin molding mold for manufacturing a foamed resin product in a molding process. The foamed resin molding mold 100 is formed between the concave mold (first configuration type) 104 having the concave surface 102, the convex mold (second configuration type) 106 covering the concave surface 102 of the concave mold 104, and the concave mold 104 and the convex mold 106. The molding chamber 108 formed by the generated space, the first fluid chamber 110 provided on the opposite side of the molding chamber 108 with respect to the concave mold 104, and the first fluid chamber 110 provided on the opposite side of the molding chamber 108 with respect to the convex mold 106. It includes a two-fluid chamber 112 and a foamed bead path 114 that introduces the foamed beads into the molding chamber 108. The concave 104 and the convex 106 are provided with a plurality of slits 122 for reasons such as sending heated steam to the molding chamber 108. The foam resin molding die 10 sends heated steam from the steam inflow path 128 in which the on-off valve 129 is opened to the first fluid chamber 110 or the second fluid chamber 112 in the single-sided heating step and the double-sided heating step in the molding step. The heated steam is sent to the molding chamber 108 through the slit 122. By the double-sided heating step, the foamed beads group in the molding chamber 108 expands and fuses to change into the molded body 120 (shown in FIG. 14). The temperature of the heated steam in the single-sided heating step and the double-sided heating step is about 150 to 160 ° C.

In the water cooling step following the double-sided heating step, as shown in FIG. 14A, the cooling water at about 60 ° C. is supplied to the first fluid chamber 110 and the second fluid from the cooling water inflow path 116 in which the on-off valve 117 is opened. The concave 104, convex 106 and The molded body 120 is cooled. In FIG. 14, “−” described in the center of each valve indicates a state in which the valve is closed. In the vacuum suction step in the molding step, as shown in FIG. 14B, the air in the first fluid chamber 110 and the second fluid chamber 112 is sucked from the vacuum suction path 124 in which the on-off valve 125 is opened, and the first is The concave mold 104, the convex mold 106, and the molded body 120 are cooled by putting the inside of the first fluid chamber 110 and the inside of the second fluid chamber 112 into a substantially vacuum state. The temperature of the concave 104 is cooled from about 120 ° C to about 65 ° C by the water cooling step and the vacuum suction step.

However, in the water cooling step, as shown in FIG. 14A, the molded body 120 shrinks due to cooling, and a gap is formed between the molded body 120 and the concave 104 and the convex 106, and the gap is formed. In the double-sided heating step and the water cooling step, steam generated from the molded body 120 enters, and the steam that has entered the gap is lowered in temperature by the cooled concave 104 and convex 106, and drain water (condensed water, steam is the temperature). A drain boundary film 126 (water liquefied by the descent) is formed. The temperature of the drain boundary film 126 is about 90 ° C, and in the process of cooling the concave 104, the convex 106 and the molded body 120 to about 65 ° C, it is cooled for a long time by the latent heat of the drain boundary film 126. I had to do it. Therefore, it was not possible to speed up the cooling of the concave mold 104, the convex mold 106, and the molded body 120.

Japanese Unexamined Patent Publication No. 10-643

An object of the present invention is to provide a foamed resin molding die and a foamed resin molding method capable of speeding up cooling of a concave mold, a convex mold and a molded body.

The foamed resin molding mold of the present invention is
The first configuration type with a concave surface and
The second configuration type that covers the concave surface of the first configuration type and
A molding chamber formed by a space generated between the first configuration type and the second configuration type is provided.
The first configuration mold allows fluid to pass between the surface opposite to the molding chamber and the molding chamber, and the direction perpendicular to the plate thickness direction of the first configuration mold is the longitudinal direction. Has multiple first slits,
The second configuration mold allows fluid to pass between the surface opposite to the molding chamber and the molding chamber, and the direction perpendicular to the plate thickness direction of the second configuration mold is the longitudinal direction. Has multiple second slits,
The molding chamber side of the first configuration type is provided with a plurality of first water reservoirs that are continuous with the first slit and collect water.
The molding chamber side of the second configuration type is characterized in that a plurality of second water reservoirs are provided continuously with the second slit to collect water.

The foamed resin molding die of the present invention is the foamed resin molding die.
The first water reservoir is configured so that a part of the water applied to the first configuration type passes through the first slit and collects.
The second water reservoir is characterized in that a part of the water applied to the second configuration type is configured to pass through the first slit and collect.

The foamed resin molding die of the present invention is the foamed resin molding die.
The water applied to the first configuration type is discharged in the plate thickness direction of the first configuration type, and the water applied to the second configuration type is discharged in the plate thickness direction of the second configuration type. It is characterized by being configured.

The foamed resin molding die of the present invention is the foamed resin molding die.
The first water reservoir and the second water reservoir are characterized by having a concave shape with the molding chamber side as an opening.

The foamed resin molding die of the present invention is the foamed resin molding die.
The first configuration type is provided with a first protrusion having a first through hole continuous with the first slit on a surface opposite to the molding chamber.
The second configuration type is characterized in that a second protrusion having a second through hole continuous with the second slit is provided on a surface opposite to the molding chamber.

The foamed resin molding die of the present invention is the foamed resin molding die.
A first fluid chamber provided on the side opposite to the molding chamber with respect to the first configuration type,
A second fluid chamber provided on the side opposite to the molding chamber with respect to the second configuration type,
The foamed bead path for introducing the foamed beads into the molding chamber, and
Equipped with
The first fluid chamber and the second fluid chamber are
The steam inflow path for sending steam into the molding chamber and
A steam outflow path for outflowing the steam sent to the molding chamber,
The water inflow route and the water inflow route
The water outflow route that causes the inflowing water to flow out,
The vacuum suction path where air is sucked and
It is characterized by being equipped with.

The foamed resin molding method of the present invention is
The foamed resin molding method using the foamed resin molding die according to any one of claims 1 to 6.
The step of filling the molding chamber with foamed beads,
The step of applying steam to the first configuration type and the second configuration type,
It is characterized by including a step of applying water to the first structural mold and the second structural mold of the foamed resin molding die.

The foamed resin molding method of the present invention is the same as the foamed resin molding method.
In the first water reservoir, a part of the water applied to the first configuration type passes through the first slit and collects.
The second water reservoir is characterized in that a part of the water applied to the second configuration type passes through the first slit and is collected.

According to the foamed resin molding die of the present invention, the heat of the drain boundary film generated around the molded body in the molding chamber is vacuum-sucked and molded in the water cooling process in which water is applied to the first structural mold and the second structural mold. In the vacuum suction step of cooling the chamber, the water is moved to the water stored in the first water reservoir or the second water reservoir. Therefore, it is possible to promote cooling of the molded body in contact with the drain boundary film. Further, in the vacuum suction step, the water accumulated in the first water reservoir and the second water reservoir is vaporized, so that the heat of the first configuration type and the second configuration type is used for the heat of vaporization, and the first configuration It is possible to promote cooling of the mold and the second configuration mold and the like. According to the foamed resin molding die of the present invention, there is a synergistic effect between the heat transfer from the drain boundary film to the water accumulated in the first water reservoir and the like and the heat of the first configuration type and the like being used for the heat of vaporization. Due to the effect, cooling of the first configuration type and the like can be further promoted.

It is a figure which shows the foam resin molding die of this invention, FIG. 3A is a front sectional view, FIG. 2B is a partially enlarged front sectional view, and FIG. It is sectional drawing of the line cut part. It is a front sectional view which shows the use state in the filling process of the foaming resin molding die shown in FIG. FIG. 3 is a front sectional view showing a state of use in the single-sided heating step of the foamed resin molding die shown in FIG. 1. FIG. 3 is a sectional front sectional view showing a state of use in the double-sided heating step of the foamed resin molding die shown in FIG. 1. It is a figure which shows the use state in the water cooling process of the foamed resin molding die shown in FIG. 1, FIG. 1A is a front sectional view, and FIG. 1B is a partially enlarged front sectional view. FIG. 3 is a sectional front sectional view showing a state of use in the vacuum suction step of the foamed resin molding die shown in FIG. 1. It is a partially enlarged front sectional view which shows the other embodiment of the foaming resin molding die of this invention. FIGS. (A) and (b) are partially enlarged front sectional views showing still another embodiment of the foamed resin molding die of the present invention. FIGS. (A) and (b) are partially enlarged front sectional views showing still another embodiment of the foamed resin molding die of the present invention. It is a figure which shows still another embodiment of the foam resin molding die of this invention, FIG. (A) is a partially enlarged front sectional view, and FIG. be. It is a figure which shows the other embodiment of the foamed resin molding die of this invention, FIG. 3A is a front view, and FIG. 2B is a partially enlarged front sectional view. It is a perspective view which shows the 1st structural mold of the foam resin molding die of FIG. It is a figure which shows the conventional foam resin molding die, FIG. 6A is a front sectional view, and FIG. 2B is a partially enlarged front sectional view. 13 is a diagram showing a usage state of the foamed resin molded mold shown in FIG. 13, FIG. 13A is a cut-off front sectional view showing a usage state in the water cooling process, and FIG. 13B is a usage state in the vacuum suction process. It is a cut-off front sectional view which shows.

Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 indicates a foamed resin molding die of the present invention.

(Structure of foamed resin molding mold 10)
As shown in FIG. 1A, the foamed resin molding die 10 has a concave mold (first configuration type) 14 having a concave surface 12 and a convex surface 13, and the convex surface 13 is arranged in the concave surface 12 of the concave mold 14. A convex mold (second configuration type) 16 that covers the concave surface 12 in a vertical state, a molding chamber 18 formed by a space created between the concave surface 12 and the convex surface 13, and a molding chamber 18 on the opposite side of the concave mold 14 to the molding chamber 18. It is provided with a first fluid chamber 201 provided, a second fluid chamber 202 provided on the opposite side of the convex mold 16 from the molding chamber 18, and a foamed bead path 24 for introducing foamed beads into the molding chamber 18. ing. The foamed resin molded mold 10 can also be used in a state of being rotated by 90 ° around the X axis with respect to the state shown in FIG. 1 (a).

The product formed by the molding chamber 18 of the foamed resin molding die 10 is a foamed resin container having a substantially U-shaped cross section. Therefore, as shown in FIG. 1A, the molding chamber 18 has a substantially U-shaped cross section. Further, the plate thickness of the foamed resin container to be formed is substantially constant. Therefore, the concave surface 12 of the concave mold 14 and the convex surface 13 of the convex mold 16 are configured to be substantially parallel so that the thickness W1 of the molding chamber 18 is substantially constant.

The concave mold 14 allows fluid (steam or water) to pass between the first fluid chamber 201 and the molding chamber 18, and is longitudinal in the direction perpendicular to the plate thickness W2 (shown in FIG. 1B) of the concave mold 14. It has a plurality of first slits 261 in the direction. On the molding chamber 18 side of the concave mold 14, fluid can pass between the first fluid chamber 201 and the molding chamber 18, and a plurality of first water reservoirs 281 continuous with the first slit 261 are provided. The first reservoir 281 has a rectangular cross section as shown in FIG. 1 (c). The first water reservoir 281 has a concave shape with the molding chamber 18 side as an opening. The width W3 of the first water reservoir 281 is less than about 2.0 mm in diameter so that foamed beads having a diameter of about 2.0 to 5.0 mm do not enter. The width W3 of the first water reservoir 281 is larger than the width W4 of the first slit 261. The width W4 of the first slit 261 is 0.2 to 1.5 mm and may be narrow as long as steam or water can pass therethrough, while the width W3 of the first water reservoir 281 is less than about 2.0 mm. It is configured to be as large as possible in the range so that a larger amount of water can easily adhere and accumulate.

The convex mold 16 allows fluid (steam or water) to pass between the second fluid chamber 202 and the molding chamber 18, and is in a direction parallel to the convex surface 13 of the convex mold 16 (plate thickness W5 of the convex mold 16 (FIG. FIG. It has a plurality of second slits 262 whose longitudinal direction is (the direction perpendicular to the direction (shown in 1 (b))). On the molding chamber 18 side of the convex mold 16, fluid can pass between the second fluid chamber 202 and the molding chamber 18, and a plurality of second water reservoirs 282 continuous with the second slit 262 are provided. The shape and dimensions of the second slit 262 are the same as those of the first slit 261. The shape and dimensions of the second reservoir 282 are the same as those of the first reservoir 281.

As shown in FIG. 1A, the first fluid chamber 201 and the second fluid chamber 202 have an air outflow for removing air from the molding chamber 18 and the like when the foamed beads are sent from the foamed bead path 24 into the molding chamber 18. A path 46, a steam inflow path 26 for sending heated steam (steam) from a boiler (not shown) to a group of foamed beads in the molding chamber 18, and a steam outflow path for discharging the heated steam sent to the foamed beads in the molding chamber 18. 28, a cooling water inflow path (water inflow path) 30 for sending cooling water (water) at 60 ° C to the first fluid chamber 201 and the second fluid chamber 202 from a water dispenser (not shown), and a first fluid chamber 201. A cooling water outflow path (water outflow path) 32 for flowing out the cooling water sent to the above, a vacuum suction path 34 for sucking air from the first fluid chamber 201 and the second fluid chamber 202 to a vacuum pump (not shown), and the like. Is equipped with. The air outflow path 46 has an on-off valve 48, the steam inflow path 26 has an on-off valve 36, the steam outflow path 28 has an on-off valve 38, and the cooling water inflow path 30 has an on-off valve 40, and the cooling water outflow path 32. Is provided with an on-off valve 42, and the vacuum suction path 34 is provided with an on-off valve 44. In the first fluid chamber 201 and the second fluid chamber 202, a spray connected to the cooling water inflow path 30 and discharging water toward the concave 14 or the convex 16 in the plate thickness W2 or W5 of the concave 14 or the convex 16. A nozzle (not shown) is provided.

(Action and effect)
The foamed resin molding die 10 of the present invention is used in a molding step in a polymerization step of forming raw material beads, a preliminary foaming step of forming foamed beads, and a molding step of molding a foamed resin product. The molding step includes a filling step of filling the foamed beads into the molding chamber 18, a one-sided heating step of applying heating steam (superheated steam, steam) to one side of the foamed bead group in the molding chamber 18, and a foaming bead group in the molding chamber 18. A double-sided heating step in which heated steam is applied to both sides, a water cooling step in which the concave 14 or the convex 16 or the like is cooled by cooling water, and a vacuum for sucking air from the first fluid chamber 201 and the second fluid chamber 202 to cool the concave 14 or the like. It consists of a suction step and a mold removal step of removing the molded body from the molding chamber.

(Filling process)
A plurality of polystyrene foam beads (hereinafter, when referred to as "foam beads", refer to a plurality of foam beads unless otherwise specified) are sent from the foam bead path 24 into the molding chamber 18. Compressed air is supplied from the air supply machine 25 to the foamed beads sent from the feeder 23 to the foamed bead path 24, so that the foamed beads are filled in the molding chamber 18 as shown in FIG. At this time, the on-off valve 48 is opened, and the air in the molding chamber 18 is discharged from the air outflow path 46 via the first slit 261 and the second slit 262, the first fluid chamber 201, the second fluid chamber 202, and the like. Slit. In each figure, "-" described in the center of each on-off valve indicates a state in which the valve is closed.

(One-sided heating process)
The foamed bead group 50 in the molding chamber 18 is heated by the heated steam (superheated steam) at about 150 to 160 ° C. As shown in FIG. 3, the heated steam sent from the boiler (not shown) is sent to the first fluid chamber 201 from the steam inflow path 26 on the first fluid chamber 201 side. The heated steam sent to the first fluid chamber 201 is sent into the molding chamber 18 through the first slit 261 and the first water reservoir 281 of the concave mold 14, and is sent to the molding chamber 18 on one side of the foamed bead group 50 in the molding chamber 18. It is sent to the second fluid chamber 202 through the gap between the foamed bead groups 50, through the second water reservoir 282 and the second slit 262 of the convex type 16, and is sent to the second fluid chamber 202, and the steam outflow path on the second fluid chamber 202 side. Outflow from 28, the foamed bead group 50 in the molding chamber 18 is heated. At this time, the on-off valve 36 on the first fluid chamber 201 side and the on-off valve 38 on the second fluid chamber 202 side are opened.

Next, although not shown, heating is performed from the other surface of the foamed bead group 50 in the molding chamber 18. That is, the heated steam is sent from the steam inflow path 26 on the second fluid chamber 202 side to the second fluid chamber 202, passes through the second slit 262 of the convex 16 and the second water reservoir 282, and enters the molding chamber 18. The steam is sent to the first fluid chamber 202 through the gap between the foam beads in the molding chamber 18, through the first water reservoir 281 and the first slit 261 of the concave mold 14, and is the steam on the first fluid chamber 201 side. It flows out from the outflow route 28. At this time, the on-off valve 36 on the second fluid chamber 202 side and the on-off valve 38 on the first fluid chamber 201 side are opened. By these single-sided heating steps, the foamed beads in the molding chamber 18 become moist. In these one-sided heating steps, a part of the heated steam hits the back surface 58 of the concave mold 14 (the surface opposite to the molding chamber 18) or the back surface 60 of the convex mold 16 (the surface opposite to the molding chamber 18), and the temperature is increased. It descends to become drain water (condensed water, water liquefied by steam due to temperature drop) at about 90 ° C, and flows down along the back surface 58 and the like of the concave shape 14. Further, a part of the heated steam hits the foamed bead group 50 through the first slit 261 and the first water reservoir 281 of the concave shape 14 or the first slit 261 and the first water reservoir portion 281 of the concave mold 14, and the temperature drops and drains. It becomes water and stays in the gap between the foamed bead groups 50.

(Double-sided heating process)
As shown in FIG. 4, two on-off valves 36 are opened, and heated steam at 150 ° C to 160 ° C flows from the two steam inflow paths 26 into the first fluid chamber 201 and the second fluid chamber 202. Sent. As a result, the concave 14 and the convex 16 are heated to the bead fusion temperature (about 120 ° C in the case of polystyrene). The heated steam enters the molding chamber 18 through the first slit 261 and the first water reservoir 281 of the concave mold 14 or the second slit 262 and the second water reservoir portion 282 of the convex mold 16. In the molding chamber 18, the drain water staying in the gaps between the foamed bead groups 50 boils and evaporates while the foamed beads swell and fuse. The steam generated by the evaporation of the drain water passes through the first water reservoir 281 and the first slit 261 and is exhausted to the first fluid chamber 201 and the like. As shown in FIG. 4, the molded body 52 is formed by the foamed beads in the molding chamber 18 swelling, fusing and solidifying. Even after the molded body 52 is formed, steam is generated from the molded body 52. The pressure in the molding chamber 18 in the double-sided heating step is about 1.6 to 2 kg / cm ² .

(Water cooling process)
As shown in FIG. 5A, two on-off valves 40 and two on-off valves 42 are opened, and cooling water at about 60 ° C from the water supply is first from the two cooling water inflow paths 30. It is sent to the fluid chamber 201 and the second fluid chamber 202, and is discharged from the two cooling water outflow paths 32. In the first fluid chamber 201 and the second fluid chamber 202, the plate thickness direction of the concave mold 14 or the like is directed from the spray nozzle (not shown) connected to the cooling water inflow path 30 toward the concave mold 14 or the like (FIG. 5 (a). ), Water is discharged into the first fluid chamber 201 and the second fluid chamber 202 in the direction indicated by the solid arrow, the X-axis or the Z-axis direction). A part of the water discharged in the first fluid chamber 201 enters the first water reservoir 281 through the first slit 261 and adheres to and accumulates in the first water reservoir 281 due to surface tension or a capillary phenomenon. A part of the water discharged in the second fluid chamber 202 enters the second water reservoir 282 through the second slit 262, and adheres to and accumulates in the second water reservoir 282 due to surface tension.

The temperature of the concave mold 14 and the convex mold 16 drops, the temperature of the molded body 52 in the molding chamber 18 drops, and the molded body 52 shrinks as shown in FIG. As the molded body 52 contracts, a gap 54 is created between the molded body 52 and the concave mold 14 and the convex mold 16. Steam generated from the molded body 52 enters the gap 54, and the steam entering the gap 54 hits the cooled concave mold 14 and the convex mold 16 to lower the temperature, and the drain boundary film 56 of drain water at about 90 ° C. It becomes. The heat of the drain boundary film 56 is transferred to the water of the first reservoir 281 and the water of the second reservoir 282 on the low temperature side. Therefore, it is possible to promote cooling of the molded body 52 in contact with the drain boundary film 56.

(Vacuum suction process)
As shown in FIG. 6, two on-off valves 44 are opened, and the air in the first fluid chamber 201 and the second fluid chamber 202 is sucked from the vacuum suction path 34 to the vacuum pump (not shown). By sucking the air in the first fluid chamber 201 and the second fluid chamber 202, the air in the molding chamber 18, the first slit 261 and the first water reservoir 281 is sucked. When the air in the molding chamber 18 or the like is sucked, the pressure in the molding chamber 18 or the like drops, and the water remaining in the molding chamber 18 or the like is vaporized (p-T diagram showing the phase change of water). The steam is sucked and discharged from the vacuum suction path 34. Further, when the air in the molding chamber 18, the first slit 261 and the first water reservoir 281 is sucked, the steam in the molding chamber 18 and the like adiabatically expands, the pressure in the molding chamber 18 and the like drops, and molding is performed. The temperature of the chamber 18 and the like drops.

In the vacuum suction step, the heat of the drain boundary film 56 is transferred to the water accumulated in the first water reservoir 281 and the second water reservoir 282. Therefore, it is possible to promote cooling of the concave shape 14, the convex shape 16, the molded body 52, etc., which are in contact with the drain boundary film 56. Further, since the water is accumulated in the first reservoir 281 and the second reservoir 282, the water accumulated in the first reservoir 281 and the second reservoir 282 is vaporized. On the other hand, the drain boundary film 56, which is drain water, vaporizes. The heat of the concave mold 14, the convex mold 16, the molding chamber 18, etc. is used for the heat of vaporization of the water in the first water reservoir 281 and the like and the drain boundary film 56. Since the foamed resin molding die 10 includes the first water reservoir 281 and the second water reservoir 282, the amount of water accumulated in the first water reservoir 281 and the second water reservoir 282 is increased to the conventional foamed resin molding die. In comparison, the amount of heat used for the heat of vaporization increases. This makes it possible to promote cooling of the concave shape 14 and the like. According to the foamed resin molding mold 10, the heat transfer from the drain boundary film 56 to the water accumulated in the first water reservoir 281 and the like and the heat of the concave mold 14 and the like are used for the heat of vaporization due to the synergistic effect. , The cooling of the concave mold 14 and the like can be further promoted.

(Release process)
The convex mold 16 is separated from the concave mold 14 by a cylinder mechanism or the like (not shown), and the molded body 52 is taken out from the molding chamber 18. When the molded body 52 is taken out, the temperatures of the concave mold 14 and the convex mold 16 are about 65 ° C.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, in the above-mentioned foamed resin molding die 10, as shown in FIG. 7, a first protruding portion having a first through hole 61 continuous with the first slit 261 on the back surface 58 of the concave mold (first configuration type) 14. 71 may be provided, and a second protrusion 72 having a second through hole 62 continuous with the second slit 262 may be provided on the back surface 60 of the convex type (second configuration type) 16. In the single-sided heating step, as described above in the description of the single-sided heating step regarding the foamed resin molding die 10 shown in FIG. 1, a part of the heated steam hits the back surface 58 of the concave mold 14 or the back surface 60 of the convex mold 16 and the temperature. It descends to become drain water at about 90 ° C, and flows down along the back surface 58 and the like of the concave mold 14. By providing the first protrusion 71 and the second protrusion 72, the drain water that flows down hits the first protrusion 71 and the like, avoids the first slit 261 and the like, and the drain water invades the first slit 261 and the like. It can be prevented from adhering. Therefore, it is ensured that the steam passes through the first slit 261 and the like and is sent to the molding chamber 18.

In the water cooling step, water is discharged from the spray nozzle (not shown) toward the concave 14 and the like in the plate thickness direction of the concave 14 or the convex 16, so that the cooling water is discharged through the first through hole 61. It is sufficiently sent from the 1 slit 261 to the first water reservoir 281 and sufficiently sent from the second slit 262 to the second water reservoir 282 through the second through hole 62. Therefore, the above-mentioned effects of the first reservoir 281 and the second reservoir 282 are maintained.

Further, the shape and dimensions of the first water reservoir 281 and the second water reservoir 282 included in the foamed resin molding die 10 of the present invention are not particularly limited. For example, the foamed resin molded mold 10 provided with the first water reservoir 281 and the second water reservoir 282 shown in FIG. 8A or FIG. 8B may be used. The first water reservoir 281 and the second water reservoir 282 shown in FIGS. 8A or 8B are provided only below the first slit 261 and the second slit 262. This is because it is considered sufficient for water to adhere to and accumulate in the first slit 261 and the second slit 262 due to surface tension. The width W3 of the first reservoir 281 and the width W6 of the second reservoir 282 are less than about 2.0 mm in diameter so that foamed beads having a diameter of about 2.0 to 5.0 mm do not enter.

Further, the foamed resin molded mold 10 provided with the first water reservoir 281 and the second water reservoir 282 shown in FIGS. 9A or 9B may be used. The concave surface 12 or the convex surface 13 side of the first water reservoir 281 and the second water reservoir 282 shown in FIGS. 9A or 9B is widened. The portion in contact with the drain boundary film 56 is widened to speed up the heat transfer from the drain boundary film 56 to the first water reservoir 281 or the second water reservoir 282, and the molded body 52 or the like in contact with the drain boundary film 56 is used. Cooling can be promoted. The maximum width W3 of the first reservoir 281 and the maximum width W6 of the second reservoir 282 are less than about 2.0 mm in diameter so that foamed beads having a diameter of about 2.0 to 5.0 mm do not enter.

Further, the foamed resin molded mold 10 provided with the first water reservoir 281 and the second water reservoir 282 shown in FIGS. 10A and 10B may be used. In the first water reservoir 281 and the second water reservoir 282 shown in FIGS. 10A and 10B, one first water reservoir 281 is continuous with two first slits 261 and one second water reservoir. The portion 282 is continuous with the two second slits 262. The volume of the first water reservoir 281 and the second water reservoir 282 can be increased to increase the amount of water stored in the first water reservoir 281 or the like. In this case, as shown in FIG. 10B, the second water reservoir 282 has a longitudinal direction (Z-axis direction) perpendicular to the longitudinal direction of the second slit 262, and the width of the second water reservoir 282. W6 has a diameter of less than about 2.0 mm so that foamed beads having a diameter of about 2.0 to 5.0 mm do not enter. The first water reservoir 281 has the same shape and dimensions as the second water reservoir 282. Further, one first reservoir 281 may be configured to be continuous with three or more first slits 261 and one second reservoir 282 may be continuous with three or more second slits 262. ..

Further, in the foamed resin molded mold 10, the first structural mold is not limited to the concave mold 14 shown in FIG. 1, and the second structural mold is not limited to the convex mold 16 shown in FIG. For example, as shown in FIG. 11A, the first configuration type 314 and the second configuration type 316 having a semicircular cross section may be used. As shown in FIG. 12, the first configuration type 314 is provided with a plurality of recesses 271 on the surface (the surface opposite to the molding chamber 18) 358, and a plurality of slits 261 on the bottom surface of each recess 271. .. As shown in FIG. 11B, a water reservoir 281 continuous with the slit 261 is provided on the molding chamber 18 side of the first configuration type 314. The first configuration type 314 and the second configuration type 316 have the same shape and dimensions except that the foamed bead path 24 is provided in the first configuration type 314 and not in the second configuration type 316. The molding chamber 18 is formed by a space created between the first configuration type 314 and the second configuration type 316. A cylindrical float can be formed by the foamed resin molding die 10 including the first structural mold 314 having a semi-circular cross section and the second structural mold 316 having a semi-circular cross section.

The foamed resin molding die of the present invention has been described above with reference to the drawings, but the present invention is not limited to the illustrated one. For example, the shapes and dimensions of the first reservoir and the second reservoir may be different from each other. Further, the first configuration type may have a concave surface, and the second configuration type may have a flat plate shape covering the concave surface of the first configuration type.

10: Foam resin molding mold 12: Concave surface 13: Convex surface 14: Concave mold (first configuration type)
16: Convex type (second configuration type)
18: Molding chamber 24: Foamed bead path 26: Steam inflow path 28: Steam outflow path 30: Cooling water inflow path (water inflow path)
32: Cooling water outflow route (water outflow route)
32: Cooling water outflow path 34: Vacuum suction path 46: Air outflow path 50: Foamed beads group 52: Molded body 54: Gap 56: Drain boundary film 261: First slit 262: Second slit 281: First water reservoir 282 : 2nd water reservoir

Claims (8)

The first configuration type with a concave surface and
The second configuration type that covers the concave surface of the first configuration type and
A molding chamber formed by a space generated between the first configuration type and the second configuration type is provided.
The first configuration mold allows fluid to pass between the surface opposite to the molding chamber and the molding chamber, and the direction perpendicular to the plate thickness direction of the first configuration mold is the longitudinal direction. Has multiple first slits,
The second configuration mold allows fluid to pass between the surface opposite to the molding chamber and the molding chamber, and the direction perpendicular to the plate thickness direction of the second configuration mold is the longitudinal direction. Has multiple second slits,
The molding chamber side of the first configuration type is provided with a plurality of first water reservoirs that are continuous with the first slit and collect water.
The molding chamber side of the second configuration mold is a foamed resin molding die in which a plurality of second water reservoirs are provided which are continuous with the second slit and where water is collected. The first water reservoir is configured so that a part of the water applied to the first configuration type passes through the first slit and collects.
The foamed resin molding die according to claim 1, wherein the second water reservoir is configured so that a part of water applied to the second configuration mold passes through the first slit and collects. The water applied to the first configuration type is discharged in the plate thickness direction of the first configuration type, and the water applied to the second configuration type is discharged in the plate thickness direction of the second configuration type. The foamed resin molding die according to claim 1 or 2, which is configured. The foamed resin molding die according to any one of claims 1 to 3, wherein the first water reservoir and the second water reservoir have a concave shape with the molding chamber side as an opening. The first configuration type is provided with a first protrusion having a first through hole continuous with the first slit on a surface opposite to the molding chamber.
The foam according to any one of claims 1 to 4, wherein the second configuration type is provided with a second protrusion having a second through hole continuous with the second slit on a surface opposite to the molding chamber. Resin molding mold. A first fluid chamber provided on the side opposite to the molding chamber with respect to the first configuration type,
A second fluid chamber provided on the side opposite to the molding chamber with respect to the second configuration type,
The foamed bead path for introducing the foamed beads into the molding chamber, and
Equipped with
The first fluid chamber and the second fluid chamber are
The steam inflow path for sending steam to the molding chamber and
A steam outflow path for outflowing the steam sent to the molding chamber,
The water inflow route and the water inflow route
The water outflow route that causes the inflowing water to flow out,
The vacuum suction path where air is sucked and
The foamed resin molding die according to any one of claims 1 to 5. The foamed resin molding method using the foamed resin molding die according to any one of claims 1 to 6.
The step of filling the molding chamber with foamed beads,
The step of applying steam to the first configuration type and the second configuration type,
A foamed resin molding method comprising a step of applying water to the first constitutional mold and the second constitutional mold of the foamed resin molding die. In the first water reservoir, a part of the water applied to the first configuration type passes through the first slit and collects.
The foamed resin molding method according to claim 7, wherein the second water reservoir portion is a part of water applied to the second configuration type and collects through the second slit.

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