JP2003251651A - Mold for molding foamable resin and molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding a foamable resin capable of enhancing the mechanical strength of a molded article with no mutual fusion-bonding failure of foamable particles, and the molded article. <P>SOLUTION: The mold for molding the foamable resin is equipped with first and second molds 1 and 2 provided with a large number of steam holes 22 and 23. A cavity formed by fitting the first and second molds 1 and 2 to each other is filled with foamable resin particles and steam is brought into contact with the foamable resin particles through a large number of the steam holes to manufacture a foamed resin molded article. The steam holes of the first mold and the steam holes of the second mold are positionally shifted in such a state the first and second molds are fitted to each other. The foamed resin molded article obtained using this mold is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin molding die for producing a foamed resin molded article by bringing foamable resin particles into contact with steam in a pair of molding dies, and a manufacturing method using the molding die. Related to molded products.

[0002]

2. Description of the Related Art Conventionally, in a foamed resin mold for producing a foamed resin molded article by bringing foamable resin particles into contact with steam in a pair of molds, the arrangement of steam holes provided in the molds. And the mechanical strength of the resulting foamed resin molded product have not been fully recognized, and normally, steam holes are provided in the first and second molds at regular pitches in the vertical and horizontal directions, and In a state where the first molding die and the second molding die are combined, the steam holes of the first molding die and the steam holes of the second molding die are arranged so as to overlap with each other.

As a conventional technique focusing on the arrangement of steam holes (also called steam holes or slits) of a foamed resin molding die, for example, the following proposals have been made. Tokuhei 6-
Japanese Patent No. 375 gazette discloses that when a polyolefin resin foam molding having a protrusion such as a partition plate is manufactured, the vapor permeation density of the tip portion of the protrusion is made larger than the vapor permeation density of other portions. Disclosed is a method for producing a polyolefin-based resin foam-molded article and a mold used for the method. Further, the same publication describes that by using this mold, defective fusion of the molded body protruding portion can be improved.

As another prior art, Japanese Patent No. 263172.
No. 6 discloses a mold for filling a mold cavity formed by a core mold and a cavity mold with polyolefin resin foam beads to produce a foam molded product having a protrusion such as a partition plate. A die part corresponding to the upper face part of the protrusion and a die part corresponding to one side face part of both side faces are provided with steam holes, and a die part corresponding to the other side face part of both side faces. Discloses a mold for producing a polyolefin resin foam molded article, which is characterized by having no steam holes.
Further, the publication describes that the fusion of the peripheral portion of the tip of the molded body is improved by using this mold.

[0005]

However, the above-mentioned prior art has the following problems. In the method described in Japanese Examined Patent Publication No. 6-375, the appearance of the molded product is impaired by increasing the number of steam holes or the hole diameter in the local area of the mold. Further, when the core mold and the cavity mold are fitted together, the position of the steam hole provided in one wall and the position of the steam hole provided in the opposite wall are the same (see FIGS. Therefore, although the expandable resin particles in the vicinity of the steam holes are in sufficient contact with the steam and a good fusion state is obtained, contact with the steam does not occur in the part without steam holes (the area away from the steam holes). There is a problem in that the fusion becomes insufficient, resulting in partial variation in the strength of the product.

Further, in the mold described in Japanese Patent No. 2631726, the fusion state at the tip of the protrusion of the molded product is improved, but the foaming pressure at the tip of the protrusion rises higher than the foaming pressure at other portions, and water cooling is performed. Since the time and cooling time increase, the time required for one cycle becomes longer, and there is a problem that the production efficiency decreases.
Further, if the water cooling time and the cooling time are matched with other portions, there is a problem that the protruding portion is easily deformed.

The present invention has been made in view of the above circumstances, and uses a foaming resin molding die which can improve the mechanical strength of a molded product without causing defective fusion of foamed resin particles with each other and a molding die therefor. It is intended to provide manufactured molded products.

[0008]

In order to achieve the above object, the present invention comprises a first mold and a second mold having a plurality of steam holes, the first mold and the second mold. In a foamed resin molding die for filling a cavity formed by combining molding dies with foamable resin particles, and contacting steam with the foamable resin particles through the plurality of steam holes to produce a foamed resin molded article, A foamed resin characterized in that the steam holes of the first molding die and the steam holes of the second molding die are displaced in a state where the first molding die and the second molding die are combined. Provide a mold. With the first molding die and the second molding die in a combined state, the steam holes of the first molding die and the steam holes of the second molding die are displaced from each other.
When the foamable resin particles are filled in the cavity formed by combining the first and second molding dies and the steam is brought into contact with the foamable resin particles through the steam holes, the steam on the first molding die side The moving distance of the steam flowing in the cavity is extended through the holes and the steam holes on the side of the second molding die, and the steam can be evenly distributed in the cavity. As a result, the fusion state of the expandable resin particles varies. Is eliminated, and the strength of the obtained molded product is improved.

In the foamed resin molding die according to the present invention, steam holes are provided in the first molding die vertically and horizontally at a regular pitch, and the steam holes of the second molding die correspond to those of the first molding die. It may be configured to be provided vertically and horizontally at a regular pitch so as not to overlap the steam holes.

In the foamed resin molding die according to the present invention, a central portion of the steam holes of the first molding die is divided into three equal parts in the vertical pitch, and a central portion is divided into three equal parts in the lateral pitch. It is preferable that the center of the steam hole of the second molding die is located in the region where the two overlap. Also,
70% or more of the area of the portion facing the cavity is the central portion of the vertical pitch of the steam holes of the first mold divided into three equal parts, and the central portion of the horizontal pitch divided into three equal parts. It is preferable to have a relationship in which the centers of the steam holes of the second mold are located in the region where and overlap.

In the foamed resin molding die according to the present invention, a small circle concentric with an inscribed circle of a triangle formed by connecting the steam holes of the first molding die and having a diameter of half of the inscribed circle. The center of the steam hole of the second mold may be located in the area. Further, 70% or more of the area of the portion facing the cavity has a diameter that is concentric with the triangular inscribed circle formed by connecting the steam holes of the first molding die and half of the inscribed circle. In the area of the small circle, the second
It is preferable to have a relationship in which the center of the steam hole of the molding die is positioned.

Further, the present invention uses the foamed resin molding die according to the present invention described above, and fills a cavity formed by combining the first molding die and the second molding die with foamable resin particles,
A foamed resin molded product obtained by bringing steam into contact with the expandable resin particles through a plurality of steam holes.
By using the foamed resin molding die according to the present invention described above, the cavity formed by combining the first and second molding dies is filled with the foamable resin particles, and the foamed resin particles are steamed through the steam holes. When making contact, the moving distance of the steam flowing in the cavity through the steam holes on the first molding die side and the steam holes on the second molding die side is extended, and the steam can be evenly distributed in the cavity, As a result, there is no variation in the fused state of the expandable resin particles, and a foamed resin molded article having high strength can be provided.

In the foamed resin molded product according to the present invention, steam hole marks on the surface of the molded product are provided vertically and horizontally at a regular pitch, and the vertical pitch of the steam hole marks on the first molding die side is divided into three equal parts. It is preferable that the center of the steam hole mark on the side of the second molding die is present in a region where the central part of the two and the central part of the lateral pitch divided into three equal parts overlap.
In addition, 70% or more of the surface area of the molded product is divided into three parts, that is, the center part of the steam hole traces on the first mold side, which is divided into three parts in the vertical pitch, and the center part of the three parts of the horizontal pitch. It is preferable that the center of the steam hole mark on the second molding die side exists in the overlapping region.

In the foamed resin molded product according to the present invention, the steam hole mark on the surface of the molded product is inscribed concentrically with the triangular inscribed circle formed by connecting the steam hole marks on the first molding die side. It is also possible to adopt a configuration in which the center of the steam hole mark on the side of the second molding die is present in the area of a small circle having a diameter of half the circle.
Also, 70% or more of the surface area of the molded product is an area of a small circle that is concentric with the triangular inscribed circle formed by connecting the steam hole marks on the first molding die side and has a diameter half that of the inscribed circle. It is preferable that the center of the steam hole mark on the second molding die side is present therein.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a molding apparatus provided with a foamed resin molding die according to the present invention, and FIG. 2 exemplifies a foamed resin molded article manufactured by the molding apparatus. This molding apparatus A comprises a pair of female molding dies 1 (first molding dies) and male molding dies 2 (second molding dies). The female molding dies 1 are fixed to a fixing base 3 while The molding die 2 is fixed to a moving base 4, and the male molding die 2 is arranged so as to be movable in a direction toward and away from the female molding die 1 by moving the moving base 4. The male and female molds 1 and 2 are
It is preferably formed of copper, aluminum, an alloy of copper and aluminum, or an alloy of copper, aluminum, magnesium and manganese (duralumin) having good thermal conductivity.

The female molding die 1 is formed with a concave portion 5, while the male molding die 2 is formed with a convex portion 6, and the male and female molding dies 1 and 2 have the concave portion 5 and the convex portion 6 respectively. When the male and female molding dies 1 and 2 are arranged so as to be opposed to each other and the convex portions 6 of the male molding die 2 are inserted into the concave portions 5 of the female molding die 1, the female molding die 1 The concave portion 5 and the convex portion 6 of the male molding die 2
The cavity 7 is formed between the surfaces facing each other. It should be noted that an expandable resin particle supply pipe (not shown) for supplying expandable resin particles into the cavity 7 is integrally provided at either part of the male and female molds 1 and 2. A filler valve (not shown) is interposed in the expandable resin particle supply pipe, and an extrusion pin (not shown) for releasing the foamed resin molded product B shown in FIG. 2 from the female mold 1 is further provided. It is provided integrally.

The insides of the male and female molds 1 and 2 are entirely hollow, and the hollow portions are chambers 20 and 21, respectively. And, in the molding wall portions 8 and 9 of the male and female molding dies 1 and 2,
Cavity 7 formed by closing male and female molds 1 and 2
A large number of steam holes 22 and 23 for communicating the inside with the inside of the chambers 20 and 21 are provided at a predetermined pitch vertically and horizontally.

Further, the chambers 20 and 21 are connected at one end thereof with vapor supply pipes 24 and 25 for supplying vapor into the chambers 20 and 21, while the vapor supply pipes 24 and 25 are connected to each other. Through chambers 20, 2
One ends of steam discharge pipes 26 and 27 for discharging the steam supplied into the chamber 1 to the outside of the chambers 20 and 21 are connected and communicated with each other. Steam supply valves 24a and 25a are installed in the steam supply pipes 24 and 25, and steam discharge valves 26a and 27a are installed in the steam discharge pipes 26 and 27.

Further, one ends of suction pipes 28 and 29 for vacuum suctioning the air in the chambers 20 and 21 are connected to and communicated with the chambers 20 and 21, respectively. The suction opening / closing valves 28a, 29a are interposed, and a vacuum pump (not shown) is arranged on the other end side of the suction opening / closing valves 28a, 29a.

FIG. 3 is a perspective view of the essential parts of a first embodiment of a foamed resin molding die according to the present invention. This molding die comprises a female molding die 1 and a male molding die 2, and a male and female molding die. 1, 2 are provided with steam holes 22 and 23 at regular pitches in the vertical and horizontal directions, and steam holes formed in the molding wall portion 8 of the female molding die 1 in a state where the female molding die 1 and the male molding die 2 are combined. 22 and the steam hole 23 formed in the molding wall portion 9 of the male molding die 2 are displaced from each other. Specifically, these male and female molds 1,
2 is within a region 32 (see FIG. 5) in which the central part of the steam holes 22 of the female mold 1 divided into three equal parts in the vertical direction and the central part of the three divided parts in the lateral direction are divided. The center of the steam hole 23 of the male mold 2 is located. As a comparative example for comparison with the foamed resin molding die according to the present invention, FIG. 4 is formed on the molding wall portion 8 of the female molding die 1 in a state where the female molding die 1 and the male molding die 2 are combined. Steam hole 22 and steam hole 23 formed in the molding wall portion 9 of the male mold 2.
7 shows a foamed resin molding die configured such that the positions of and overlap.

FIG. 5 is a view for explaining the arrangement state of the steam holes 22 and 23 when the male and female molding dies 1 and 2 according to the first embodiment are closed. As shown in this figure, the female mold 1 is provided with a large number of steam holes 22 in the vertical and horizontal directions at regular pitches L and W over substantially the entire surface of the molding wall portion 8. The steam hole 23 of the male molding die 2 is composed of a central portion obtained by dividing the vertical pitch L of the vapor holes 22 on the female molding die 1 side into three equal parts and a central portion obtained by dividing the horizontal pitch W into three equal parts. The center is located in the overlapping region 32 (shown by hatching in FIG. 5), and preferably, the center of the steam hole 23 of the male mold 2 is located at or near the center of the region 32.

The vapor holes 22 and 23 are provided with a ventilation member having slits and a large number of small holes in order to prevent the expandable resin particles filling the cavity 7 from leaking out. The diameters of the steam holes 22 and 23 may be constant in both the male and female molds 1 and 2, or the diameters thereof may be locally changed, and it is usually preferable to set the diameter to about 3 to 12 mm. The vertical and horizontal pitches L and W can be appropriately selected according to the dimensions of the foamed resin molded product,
Usually, both L and W are about 25 mm to 40 mm. The shape of these steam holes 22 and 23 is not particularly limited,
Normally, the steam holes 22 and 23 are formed in a circular shape, and a cylindrical ventilation member is attached to the steam holes 22 and 23.

As described above, the steam holes 22 of the female molding die 1 and the steam holes 23 of the male molding die 2 are displaced from each other, so that the cavity 7 formed by combining the male and female molding dies 1 and 2 is formed. Filling with expandable resin particles, these vapor holes 2
When steam is brought into contact with the expandable resin particles via 2, 23, the moving distance of the steam flowing in the cavity 7 is extended through the steam holes 22 on the female molding die 1 side and the steam holes 23 on the male molding die 2 side. As a result, the vapor can be evenly distributed in the cavities 7, and as a result, variations in the fused state of the expandable resin particles can be eliminated, and the strength of the resulting foamed resin molded product can be improved.

FIG. 6 is a view showing a second embodiment of the foamed resin molding die according to the present invention. In the second embodiment, as in the first embodiment described above, the male and female molds 1,
Each of No. 2 has a large number of steam holes 22 and 23 at regular pitches in the vertical and horizontal directions, but the same pitch L is set in the vertical and horizontal directions, and the vertical pitch L of the steam holes 22 on the female molding die 1 side is equal to three or the like. The center of the steam hole 23 of the male molding die 2 is placed in a region 32 (indicated by diagonal lines in FIG. 6) where the central portion of the divided parts and the central portion of the lateral pitch L divided into three equal parts overlap. It is located. Even when the formation pitches of the steam holes 22 and 23 are equal in the vertical and horizontal directions in this way, the same operational effects as those of the above-described first embodiment can be obtained.

FIG. 7 is a view showing a third embodiment of the foamed resin molding die according to the present invention. In the third embodiment, the steam holes 22 on the side of the female molding die 1 are formed such that the vertical and horizontal rows are arranged at a regular pitch along the diagonal direction with respect to the vertical and horizontal directions of the foamed resin molded product. Further, the steam hole 23 on the male molding die 2 side is
Of the arrangement of the steam holes 22 on the female molding die 1 side, the center portion of the pitch L arranged along the line descending to the right is divided into three equal parts,
The center of the steam hole 23 is located in a region 32 that overlaps with the central part of the pitch W that is arranged along the line rising to the right and is divided into three equal parts. Also in the third embodiment, the same operational effect as that of the above-described first embodiment can be obtained.

FIG. 8 is a view showing a fourth embodiment of the foamed resin molding die according to the present invention. In the fourth embodiment, the steam holes 22 on the female molding die 1 side are formed at a regular pitch along the diagonal direction with respect to the vertical and horizontal directions of the foamed resin molded product in the vertical and horizontal directions. The pitch lined up in the downward line and the pitch lined up in the rightward line are the same pitch L. Further, the steam holes 23 on the male molding die 2 side are arranged in the center of the steam holes 22 on the female molding die 1 side, which are divided into three equal parts of the pitch L arranged along the line descending to the right, and to the right rising. The center of the steam hole 23 is located in a region 32 where the center portion of the pitch L arranged along the line is divided into three equal parts.
Also in the fourth embodiment, the same operational effects as those of the above-described first embodiment can be obtained.

FIG. 9 is a view showing a fifth embodiment of the foamed resin molding die according to the present invention. In the fifth embodiment, the steam holes 22 on the female molding die 1 side are formed so that the horizontal arrangement becomes zigzag. The pitch L between the steam holes 22 arranged in the zigzag is the same. Further, the length of one side of a triangle obtained by connecting the three steam holes 22 shown in FIG. 9 is L√3. Further, the steam hole 23 on the male molding die 2 side is an area within a small circle having a diameter of 1/2 of the inscribed circle from the center of the triangular inscribed circle (inscribed circle diameter L) on the female molding die 1 side. The steam hole 23 is positioned so that the center is at 32. Also in the fifth embodiment, the same operational effects as those of the above-described first embodiment can be obtained.

FIG. 10 is a view showing a sixth embodiment of the foamed resin molding die according to the present invention. In the sixth embodiment, as shown in FIG. 10, the steam holes 22 on the female molding die 1 side are basically hexagons formed by connecting six steam holes 22, and the hexagons are connected in the lateral direction. Are arranged as follows.
The pitch L between two adjacent steam holes 22 is the same. The length of one side of the triangle obtained by connecting the three steam holes 22 shown in FIG. 10 is L√3. In addition, the steam hole 23 on the male forming die 2 side is 1 / in the inscribed circle from the center of the triangle inscribed circle (inscribed circle diameter is L) on the female forming die 1 side.
The steam hole 23 is positioned so that the center thereof is located in the area 32 within the small circle having the diameter of 2. Also in the sixth embodiment, the same operational effects as those of the above-described first embodiment can be obtained.

In the foamed resin molding die according to the present invention, it is sufficient that the vapor holes 22 and 23 of the male and female molding dies 1 and 2 are deviated, and the male and female moldings are not necessarily the same as in the first to sixth embodiments described above. The steam holes 22 and 23 of the molds 1 and 2 do not have to be provided vertically and horizontally at a regular pitch. For example, when steam holes 22 and 23 are provided on the male and female molds 1 and 2 along a plurality of concentric circles in order to manufacture a foamed resin molded product having a circular portion, the concentric circles on the female mold 1 side are The center and the center of the concentric circle on the male molding die 2 side can be displaced from each other.

Further, in the foamed resin molding die according to the present invention, the area of the male and female molding dies 1 and 2 facing the cavity 7 is 7
0% or more, preferably 80% or more, more preferably 90%
% Or more, the steam holes 22 and 23 of the male and female molds 1 and 2
It is preferable that they are out of alignment. Here, male and female molds 1, 2
The area of the portion where the steam holes 22 and 23 are deviated is 70% or more of the area of the male and female molds 1 and 2 facing the cavity 7.
As described above, the end face of the expandable resin particle supply pipe, the inlet / outlet of the extrusion pin, the vapor hole 2 such as the measurement position of the thermometer or the pressure gauge.
2 and 23 are required to be provided, and the male and female molding dies are provided over almost the entire area of the area (that is, the steam hole forming area) excluding the area necessary for installing these parts and devices, preferably the entire area. This means that the steam holes 22 and 23 of 1 and 2 are displaced. Further, the shape of the foamed resin molding die is not limited to the male and female molding dies 1 and 2 described above, and various shapes such as a columnar shape, a prismatic shape, a bottomed cylindrical shape, a cylindrical shape, and a spherical shape other than the box shape. It goes without saying that the invention can also be applied to a foamed resin molding die for producing a foamed resin molded product having a shape.

Next, the procedure for molding the foamed resin molded product illustrated in FIG. 2 using the steam molding apparatus A will be described. First, the male and female molding dies 1 and 2 configured as described above are closed, and the cavity 7 is formed between the facing surfaces of the molding wall portions 8 and 9 of the male and female molding dies 1 and 2 (mold closing step).

Subsequently, the filler valve of the female molding die 1 is opened to supply and fill the expandable resin particles into the cavity 7 through the expandable resin particle supply pipe (filling step).

The expandable resin particles are obtained by pre-expanding synthetic resin particles containing a foaming agent. Synthetic resins constituting the synthetic resin particles have been conventionally used for producing foamed resin molded articles. Can be appropriately selected and used from the resin materials used in, and is not particularly limited.
For example, polystyrene, high-impact polystyrene,
Styrene-maleic anhydride copolymer, polystyrene-based resin such as styrene-acrylonitrile copolymer, polyethylene, polypropylene, polyolefin-based resin such as ethylene-vinyl acetate copolymer, polyester-based resin such as polyethylene terephthalate. A polystyrene-based resin is preferable because of its good strength and moldability.

As the foaming agent, an organic compound which has a boiling point not higher than the softening point of the synthetic resin and is in a gaseous or liquid state under normal pressure is suitable, for example, propane, butane,
Hydrocarbons such as pentane, cyclopentane, cyclopentadiene, hexane, petroleum ether, dimethyl ether,
Low boiling point ether compounds such as diethyl ether, dipropyl ether and methyl ethyl ether, and inorganic gases such as carbon dioxide and nitrogen are used. These foaming agents may be used alone or in combination of two or more. The content of the foaming agent is 1 to 20% by weight, preferably 2 to 10% by weight, based on the weight of the synthetic resin particles.
When the content of the foaming agent is less than the above range, the expansion ratio of the foam-molded article is insufficient and a lightweight foam cannot be obtained. On the other hand, even if the content of the foaming agent exceeds the above range, further expansion of the foaming ratio cannot be substantially expected, and the foaming becomes unstable, which is not preferable.

After the filling process, the steam supply valves 24a, 25a
And the steam discharge valves 26a and 27a are opened to supply the steam supply pipe 2
Chambers 20 of male and female molds 1, 2,
21 is supplied and filled with steam, and the steam is circulated into the chambers 20 and 21 through the steam discharge pipes 26 and 27 of the male and female molding dies 1 and 2 to heat the chambers 20 and 21 for a predetermined time (die heating). Process). Thereafter, the steam supply valve 25a of the male molding die 2 is closed and the steam discharge valve 26a of the female molding die 1 is closed, and the steam supply pipe 2 of the female molding die 1 is closed.
4, the steam is supplied into the chamber 20 of the female mold 1, and the steam is caused to flow into the cavity 7 through the steam holes 22 of the female mold 1 so as to come into contact with and pass through the expandable resin particles. After heating and foaming the particles, the chamber 21 of the male mold 2 is passed through the steam holes 23 of the male mold 2.
After flowing in, it is discharged to the outside through the steam discharge pipe 27 of the male molding die 2 (one heating step). Subsequently, the steam supply valve 25 a of the male molding die 2 and the steam discharge valve 2 of the female molding die 1
6a is opened while the steam supply valve 24a of the female mold 1 and the steam discharge valve 27a of the male mold 2 are closed, and the chamber 2 of the male mold 2 is passed through the steam supply pipe 25 of the male mold 2.
1 is supplied with steam, and this steam is caused to flow into the cavity 7 through the steam holes 23 of the male mold 2 to contact and pass through the expandable resin particles, and the expandable resin particles are heated and foamed. After flowing into the chamber 20 of the female mold 1 through the steam holes 22 of the female mold 1, the steam is discharged to the outside through the steam discharge pipe 26 of the female mold 1 (reverse one-side heating step). Then, the steam supply valves 24a of the male and female molds 1 and 2,
25a are both opened, while the steam discharge valves 26a and 27a of the male and female molds 1 and 2 are closed, and the steam supply pipes 24 and 2 are inserted into the chambers 20 and 21 of the male and female molds 1 and 2, respectively.
5 to supply and fill steam to make male and female molds 1, 2
The molding walls 8 and 9 are heated to heat the cavity 7, and the vapor in the chambers 20 and 21 is vaporized into the vapor holes 22 and 2.
The expandable resin particles in the cavity 7 are heated and foamed through 3 to produce a foamed resin molded product B (double-sided heating step). A series of steps from the mold heating step to the double-sided heating step are collectively referred to as a heat foaming step.

Next, in the cooling step, the male and female molds 1 and 2 are
A cooling medium is supplied and circulated in the chambers 20 and 21 through the cooling medium supply pipe (not shown) of the cavity 7
Cool the foamed resin molding inside. The cooling medium is not particularly limited, and examples thereof include cooling water and cooling air.

After cooling with this cooling medium, the vacuum pump is driven to drive the chambers 2 of the male and female molds 1 and 2.
The inside of 0 and 21 is vacuum-sucked through the suction pipes 28 and 29 to be in a reduced pressure state.

Since the insides of the chambers 20 and 21 and the inside of the cavity 7 are in communication with each other through the steam holes 22 and 23, the inside of the cavity 7 containing the foamed resin molded article is also in a depressurized state by vacuum suction by a vacuum pump. Become.

On the other hand, the steam used for heating and foaming the expandable resin particles is condensed and liquefied as the temperature decreases due to cooling, and this condensed water is formed on the surface and inside of the foamed resin molded product in the cavity 7. Existing.

However, the condensed water existing on the surface and inside of the foamed resin molded product is smoothly vaporized by the reduced pressure state as described above, and the foamed resin molded product is cooled by the heat of vaporization of the condensed water. At the same time, the vaporized water is immediately sucked by the vacuum pump and the suction pipe 2
It is discharged and removed to the outside through 8, 29.

As described above, the foamed resin molded product in the cavity 7 is vacuum-sucked in the chambers 20 and 21 to vaporize the condensed water existing on the surface and the inside of the foamed resin molded product under reduced pressure, and by the heat of vaporization of the condensed water. Since it is cooled, the foamed resin molded product is effectively cooled in a short time. Further, as described above, the condensed water adhering to the surface of the foamed resin molded product and the condensed water that has entered the inside of the foamed resin molded product are vaporized under reduced pressure and forcibly sucked and removed. Can be obtained.

Then, the vacuum pumps provided in the male and female molds 1 and 2 are stopped, and the suction opening / closing valves 28a and 29a are provided.
And the steam discharge valves 26 of the male and female molds 1 and 2 are closed.
a and 27a are opened to release the depressurized state in the chambers 20 and 21 of the male and female molds 1 and 2, and the chamber 20 and
The inside of 21 is set to the atmospheric pressure, and the moving table 4 is moved in the separating direction with respect to the fixed table 3.
Is opened, the extrusion pin provided in the female molding die 1 is operated, and the foamed resin molded product in the cavity 7 is released and taken out (mold opening step).

Then, the mold closing step to the mold opening step are set as a series of molding steps, and this molding step is repeated to continuously mold the foamed resin molded article.

FIG. 2 exemplifies a foamed resin molded product manufactured by using the molding apparatus A through a series of steps from the mold closing step to the mold opening step as described above. In B, steam hole marks 30 and 31 are formed on the surface of the positions corresponding to the positions of the many steam holes 22 and 23 provided in the male and female molds 1 and 2. Then, in the foamed resin molded product B, steam hole marks 30 formed on the surface side in contact with the female molding die 1 and steam hole marks 31 formed on the surface side in contact with the male molding die 2 were formed. Are formed vertically and horizontally at a regular pitch, and steam hole marks 30 and 31 formed on the respective surface sides are formed in a shifted state. Specifically, 70% or more, preferably 80% or more, more preferably 90% or more of the surface area of the foamed resin molded product B divides the vertical pitch of the steam hole marks 30 on the female mold 1 side into three equal parts. The center of the steam hole mark 31 on the male molding die 1 side exists in the region 32 where the central part of the two and the central part of the lateral pitch divided into three equal parts overlap.

As described above, the foamed resin molded body B is manufactured by using the foamed resin molding die according to the present invention, which comprises the male and female molding dies 1 and 2 which are provided by shifting the formation positions of the steam holes 22 and 23, respectively. Since it has been processed, male and female molds 1 and 2
When the foamable resin particles are filled in the cavity 7 formed by combining the two and the steam is brought into contact with the foamable resin particles through the steam holes 22 and 23, the steam hole 22 on the female molding die 1 side and the male molding die The moving distance of the steam flowing in the cavity 7 through the steam holes 23 on the second side can be extended, and the steam can be evenly distributed in the cavity 7. As a result, there is no variation in the fusion state of the expandable resin particles. It has high strength.

[0046]

(Examples) (Examples 1 and 2) Male and female molding dies 1 shown in FIG.
2 (Material: casting aluminum alloy AC-4A)
Using the molding apparatus A configured as shown in, the outer dimension length (L) is 400 mm, the width (W) is 300 mm, the height (H) is 104 mm, and the inner dimension length (l) is 360 m.
A box-shaped (see FIG. 2) foamed resin molded product having m, a width (w) of 260 mm, and a height (h) of 87 mm was produced. The arrangement of the steam holes 22 and 23 of the male and female molds 1 and 2 is as shown in FIG.
The male and female molds 1 and 2 are provided with steam holes 22 and 23 at regular pitches L and W, and the steam holes 23 of the male mold 2 have the vertical pitch L of the steam holes 22 on the female mold 1 side. The center is located in a region 32 where the center part of the trisector and the center part of the lateral pitch W are trisected. The pitches L and W are both set to 30 mm, and a circular steam hole having a diameter of 10 mm is formed on the female molding die 1 side.
33 circular steam holes each having a diameter of 8 mm were provided. On the other hand, 228 circular steam holes having a diameter of 10 mm were provided on the male molding die 2 side. All steam holes 22 and 23 have a mesh width of 0.4 mm
A cylindrical ventilation member having a slit was attached. The male and female molds 1 and 2 were closed, and the cavity 7 was formed between the facing surfaces of the molding walls 8 and 9 of the male and female molds 1 and 2 (mold closing step).

Subsequently, the filler valve of the female molding die 1 is opened and polystyrene resin particles containing a foaming agent (made by Sekisui Plastics Co., Ltd., trade name "Eslen beads HDM") are opened in the cavity 7 through the expandable resin particle supply pipe. Bulk magnification 45 times and 65
Double and pre-expandable expandable resin particles were supplied and filled.
In this example, a molded product having an expansion ratio of 45 times produced by using expandable resin particles pre-expanded to have a expansion ratio of 45 times was used in Example 1, and the expandable resin particles pre-expanded to a expansion ratio of 65 times were used. A molded product with a foaming ratio of 65 times produced by
And

Subsequently, the steam supply valves 24a and 25a are opened to supply and fill 0.069 MPa of steam into the chambers 20 and 21 of the male and female molds 1 and 2 through the steam supply pipes 24 and 25, respectively. Is discharged to the outside of the chambers 20, 21 through the steam discharge pipes 26, 27 of the male and female molds 1, 2.
And the chambers 20 and 21 were heated for 2.0 seconds (mold heating step). Then, the steam supply valve 25a of the male mold 2 is closed and the steam discharge valve 26 of the female mold 1 is closed.
a is closed, 0.069 MPa of steam is supplied into the chamber 20 of the female mold 1 through the steam supply pipe 24 of the female mold 1, and this steam is introduced into the cavity 7 through the steam holes 22 of the female mold 1. The resin 21 is made to flow into and contact the foamable resin particles to pass therethrough, the foamable resin particles are heated and foamed, and then the chamber 21 of the male mold 2 is passed through the steam holes 23 of the male mold 2.
After being made to flow inside, it is discharged to the outside through the steam discharge pipe 27 of the male mold 2, and the pressure in the chamber 20 becomes 0.03.
The inside of the cavity 7 was heated to 4 MPa (one heating step). Subsequently, the steam supply valve 25a of the male mold 2 and the steam discharge valve 26a of the female mold 1 are opened, while the steam supply valve 24a of the female mold 1 and the steam discharge valve 2 of the male mold 2 are opened.
7a is closed, 0.069 MPa of steam is supplied and filled into the chamber 21 of the male mold 2 through the steam supply pipe 25 of the male mold 2, and this steam is filled with the steam holes 2 of the male mold 2.
3 to flow into the cavity 7 to contact and pass through the expandable resin particles to heat and expand the expandable resin particles, and then into the chamber 20 of the female mold 1 through the steam holes 22 of the female mold 1. After flowing in, it is discharged to the outside through the steam discharge pipe 26 of the female molding die 1, and the inside of the cavity 7 is 2.
Heated for 0 seconds (reverse one-side heating step). Finally, the steam supply valves 24a and 25a of the male and female molds 1 and 2 are both opened, while the steam discharge valves 26a and 27 of the male and female molds 1 and 2 are opened.
a is closed together, the chambers 20 of the male and female molds 1 and 2,
21 was filled with 0.069 MPa of steam to heat and foam the expandable resin particles (both sides heating step) to produce a foamed resin molded product. The double-sided heating time was 4.0 seconds for a molded product having an expansion ratio of 45 times and 4.5 seconds for a molded product having an expansion ratio of 65 times.

Next, in the cooling step, the male and female molds 1 and 2 are
Of the foamed resin in the cavity 7 by opening the cooling medium supply valve and supplying and circulating 35 ° C. cooling water in the chambers 20 and 21 and discharging the cooling water to the outside through the steam discharge pipes 26 and 27. The molded product was cooled for 5.0 seconds (water cooling step).

Further, after this water cooling step, the vacuum pump was driven to suck the inside of the chambers 20 and 21 of the male and female molds 1 and 2 to a reduced pressure state of -0.08 MPa in gauge pressure. Then, the foamed resin molded product in the cavity 7 was cooled to a predetermined temperature (cooling step).

Then, the vacuum pumps provided in the male and female molds 1 and 2 are stopped and the suction on-off valves 28a and 29a are closed, and the vapor discharge valves 26a and 26a of the male and female molds 1 and 2 are closed.
27a is opened, and the chamber 2 of the male and female molds 1 and 2 is opened.
After releasing the depressurized state in 0, 21 to atmospheric pressure, the moving table 4 is moved in the direction away from the fixed table 3 to open the male and female molding dies 1 and 2 to form the female molding dies 1. By operating the extrusion pin provided, the foamed resin molded product (Example 1 and Example 2) in the cavity 7 was released and taken out (mold opening step).

(Embodiment 3) As shown in FIG.
A male and female molding dies 1 and 2 (materials: aluminum alloy AC-4A for casting) having Nos. 2 and 23 are used, and a molding apparatus A configured as shown in FIG. 1 is used. 400 m
m, width (W) is 300 mm, height (H) is 104 mm
And the inner length (l) is 360 mm and the width (w) is 26.
A box-shaped (see FIG. 2) foamed resin molded product having 0 mm and a height (h) of 87 mm was produced. Steam holes 2 for male and female molds 1 and 2
As shown in FIG. 9, 2 and 23 are arranged so that the center of the steam hole 23 of the male mold 2 is located at the center of the inscribed circle of the equilateral triangle formed by connecting the three steam holes 22 of the female mold 1. Set up in. The diameter L of the inscribed circle of the equilateral triangle is set to 25 mm, and a circular steam hole having a diameter of 10 mm is formed on the female molding die 1 side.
I provided one. On the other hand, 221 circular steam holes having a diameter of 10 mm were provided on the male molding die 2 side. A cylindrical ventilation member having slits with a mesh width of 0.4 mm was attached to all the steam holes 22 and 23. The male and female molds 1 and 2 were closed, and the cavity 7 was formed between the opposing surfaces of the molding wall portions 8 and 9 of the male and female molds 1 and 2 (mold closing step).

Subsequently, the filler valve of the female molding die 1 is opened, and polystyrene resin particles containing a foaming agent (made by Sekisui Plastics Co., Ltd., in the cavity 7 through the expandable resin particle supply pipe).
The expandable resin particles obtained by pre-expanding the product name "Eslen beads HDM") to a bulk ratio of 65 times were supplied and filled. In this example, a molded product having a foaming ratio of 65 times produced by using the expandable resin particles pre-expanded to a bulk ratio of 65 times was used as Example 3.

Subsequently, the steam supply pipes 24a and 25a are opened to supply and fill 0.069 MPa of steam into the chambers 20 and 21 of the male and female molds 1 and 2 through the steam supply pipes 24 and 25, respectively. Is discharged to the outside of the chambers 20, 21 through the steam discharge pipes 26, 27 of the male and female molds 1, 2.
And the chambers 20 and 21 were heated for 2.0 seconds (mold heating step). Then, the steam supply valve 25a of the male mold 2 is closed and the steam discharge valve 26 of the female mold 1 is closed.
a is closed, 0.069 MPa of steam is supplied into the chamber 20 of the female mold 1 through the steam supply pipe 24 of the female mold 1, and this steam is introduced into the cavity 7 through the steam holes 22 of the female mold 1. The resin 21 is made to flow into and contact the foamable resin particles to pass therethrough, the foamable resin particles are heated and foamed, and then the chamber 21 of the male mold 2 is passed through the steam holes 23 of the male mold 2.
After being made to flow inside, it is discharged to the outside through the steam discharge pipe 27 of the male mold 2, and the pressure in the chamber 20 becomes 0.03.
The inside of the cavity 7 was heated to 4 MPa (one heating step). Subsequently, the steam supply valve 25a of the male mold 2 and the steam discharge valve 26a of the female mold 1 are opened, while the steam supply valve 24a of the female mold 1 and the steam discharge valve 2 of the male mold 2 are opened.
7a is closed, 0.069 MPa of steam is supplied and filled into the chamber 21 of the male mold 2 through the steam supply pipe 25 of the male mold 2, and this steam is filled with the steam holes 2 of the male mold 2.
3 to flow into the cavity 7 to contact and pass through the expandable resin particles to heat and expand the expandable resin particles, and then into the chamber 20 of the female mold 1 through the steam holes 22 of the female mold 1. After flowing in, it is discharged to the outside through the steam discharge pipe 26 of the female molding die 1, and the inside of the cavity 7 is 2.
Heated for 0 seconds (reverse one-side heating step). Finally, the steam supply valves 24a and 25a of the male and female molds 1 and 2 are both opened, while the steam discharge valves 26a and 27 of the male and female molds 1 and 2 are opened.
a is closed together, the chambers 20 of the male and female molds 1 and 2,
21 was filled with 0.069 MPa of steam to heat and foam the expandable resin particles (both sides heated) to produce a foamed resin molded article. Both sides heating time was set to 4.5 seconds.

Next, in the cooling step, the male and female molds 1 and 2 are
Of the foamed resin in the cavity 7 by opening the cooling medium supply pipe and supplying and circulating the cooling water of 35 ° C. into the chambers 20 and 21 and discharging the cooling water to the outside through the steam discharge pipes 26 and 27. The molded product was cooled for 5.0 seconds (water cooling step).

Further, after this water cooling step, the vacuum pump was driven to suck the inside of the chambers 20 and 21 of the male and female molds 1 and 2 to a reduced pressure state of -0.08 MPa in gauge pressure. Then, the foamed resin molded product in the cavity 7 was cooled to a predetermined temperature (cooling step).

Then, the vacuum pumps provided in the male and female molds 1 and 2 are stopped and the suction on-off valves 28a and 29a are closed, and the vapor discharge valves 26a and 26a of the male and female molds 1 and 2 are closed.
27a is opened, and the chamber 2 of the male and female molds 1 and 2 is opened.
After releasing the depressurized state in 0, 21 to atmospheric pressure, the moving table 4 is moved in the direction away from the fixed table 3 to open the male and female molding dies 1 and 2 to form the female molding dies 1. The extrusion pin provided was operated to release the foamed resin molded product (Example 3) in the cavity 7 and take it out (mold opening step).

(Comparative Examples 1 and 2) Using the male and female molds shown in FIG. 4, foamed resin molded articles were produced in the same manner as in Examples 1 and 2. The male and female molds used in the preparation of Comparative Examples 1 and 2 were arranged so that the steam holes on the female mold side and the steam holes on the male mold side overlap in the mold closed state. Both pitches L and W are 30
mm, set 268 circular steam holes with a diameter of 10 mm, 33 circular steam holes with a diameter of 8 mm on the female molding die side, and circular steam holes with a diameter of 10 mm on the male molding die 2 side. 229 were provided. All of the steam holes 22 and 23 were equipped with a cylindrical ventilation member having slits having a mesh width of 0.4 mm. With this male and female molding die, the foamed resin molded articles of Comparative Examples 1 and 2 were manufactured through the same manufacturing steps as those of Examples 1 and 2 described above. In this comparative example, a foaming ratio of 4 was produced using expandable resin particles pre-expanded to a bulk ratio of 45 times.
A molded product having a 5 times expansion ratio was used as Comparative Example 1, and a molded product having a expansion ratio of 65 times produced using expandable resin particles pre-expanded to a bulk expansion ratio of 65 times was used as Comparative Example 2.

Comparative Example 3 Using the male and female molding dies shown in FIG. 4, a foamed resin molded article was prepared in the same manner as in Example 3. The male and female molds used in the preparation of Comparative Example 1 were arranged so that the steam holes on the female mold side and the steam holes on the male mold side overlap with each other in the mold closed state. The diameter L of the inscribed circle of the equilateral triangle is set to 25 mm, 236 circular steam holes with a diameter of 10 mm are provided on the female molding die 1 side, and a circular steam hole with a diameter of 10 mm is provided on the male molding die 2 side. 206 pieces were provided. All the steam holes 22 and 23 were equipped with a cylindrical ventilation member having slits having a mesh width of 0.4 mm. With this male and female mold, the third embodiment described above is used.
A foamed resin molded article of Comparative Example 1 was produced through the same manufacturing steps as described above. In this comparative example, an expansion ratio of 65 produced using expandable resin particles pre-expanded to a bulk ratio of 65 times.
A double molded product was used as Comparative Example 3. The molding conditions of Examples 1 to 3 and Comparative Examples 1 to 3 are summarized in Table 1 below.

[0060]

[Table 1]

[Comparison of fusion rate] The appearances of the molded products of Example 1 and Comparative Example 1, Example 2 and Comparative Example 2 and Example 3 and Comparative Example 3 were compared, and it was found that the surface gloss and the like were different. There was no. However, when the fusion rate (%) of the expanded particles on the fracture surface of each molded product was measured and compared, both the molded product with a bulk ratio of 45 times and the molded product with a bulk ratio of 65 were compared in Examples 1 to 3 as comparative examples. It was higher than 1-3. Here, the fusion rate (%) means the number of particles in which the foamed particles are material-destructed and the particles in which interfacial destruction (peel) is caused in the fracture surface generated by pressing and breaking the molded product at a right angle corner. It is a value expressed in percent (%) with the total of the number and the number as the denominator, and the number of particles having material destruction as the numerator. The measurement results of the fusion rate of each molded product are shown in Table 2 below.

[0062]

[Table 2]

[Comparison of Strength] Next, a buckling test, a tensile test, and a bending test by cutting out the bottom portion of each of the produced molded products were performed for comparison. For these tests, Tensilon (model name UCT) manufactured by ORITEC
-5T), and buckling test, tensile test and bending test were performed using different load cells.

(Buckling test) The buckling test was carried out by using the above measuring device with a load cell (typeUF) manufactured by ORITEC.
-5 CAP. 5tf SER. NO. (049539)
20 and attach the box-shaped molded product as shown in Fig. 20.
It was sandwiched between sheets and pressed from above with a load cell until the molded product was broken, and the displacement and load at that time were measured.
The test was conducted at a head speed of 10 mm / min.
The buckling test maximum point load measurement results of the molded products of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 3 below and FIGS. 11, 12, and 17.

[0065]

[Table 3]

(Tensile Test) In the tensile test, a load cell (type) manufactured by ORIENTEC was used in the above measuring device.
UR-100L-A CAP. 100 kgf SER.
NO. 224846), and as shown in FIG. 21, one side wall of the molded product is the fixed side and the opposite side wall is the tensile side so that a tensile force is applied in the longitudinal direction of the box-shaped molded product. The load cell was sandwiched between jigs, the load cell was fixed to the jig on the pulling side, and the molded article was pulled until it was broken, and the displacement and load at that time were measured. The test was conducted at a head speed of 10 mm / min. The jig on the pulling side has a U-shape of 40 mm × 40 mm, and has a width of 80 mm,
Use a wall thickness of 9 mm, and the fixed jig is 40 mm x
The one having a U-shape of 40 mm and a width of 200 mm was used. The measurement results of the tensile test maximum point loads of the molded products of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in the following Table 4 and FIGS. 13, 14 and 18.

[0067]

[Table 4]

(Bending Test) The bending test is performed according to the test method JIS.
The evaluation was performed according to A9511. As shown in the outline in FIG. 22, the cut-out test pieces are set on two support bases arranged at an interval of 200 mm, and a load cell (type) manufactured by ORITEC is provided in the middle of these support bases.
e UR-100L-A CAP. 100kgf SE
R. NO. 224846) was pressed to measure the displacement and load when the test piece was bent. The size of the test piece is 7
The bottom portion of the box was cut out and used so that the thickness was 5 mm × 300 mm and the thickness was 17 mm. Head speed is 10m
It was set to m / min. The measurement results of the bending test maximum point loads of the molded products of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in the following Table 5 and FIGS. 15, 16 and 19.

[0069]

[Table 5]

From the measurement results of the fusion rate shown in Table 2, each of the molded products of Examples 1 to 3 produced by using the male and female molding dies arranged with the positions of the steam holes shifted, showed a high fusion of 95% or more. Showed the rate. On the other hand, each molded product of Comparative Examples 1 to 3 produced by using the male and female molds in which the positions of the steam holes are overlapped,
The fusion rate of the expanded particles was lower than in Examples 1 to 3. Therefore, it was found that by using the male and female molding dies in which the steam holes are arranged at different positions, the fusion rate of the expanded particles can be improved by extending the moving distance of the steam flowing in the dies. Furthermore, Examples 1-3 and Comparative Examples 1-3
As a result of comparing the amount of steam used in the production of (see Table 1), Examples 1 to 3 were less, and it was found that the present invention can reduce the amount of steam used.

From the results of the tests shown in Tables 3 to 5 and FIGS. 11 to 19, the molded products of Examples 1 to 3 produced by using the male and female molds arranged with the steam holes displaced ,
Compared with the molded products of Comparative Examples 1 to 3, the buckling strength of the molded products,
Both tensile strength and bending strength increased. From these results, Examples 1 to 3 according to the present invention were produced by using the male and female molding dies arranged with the positions of the steam holes displaced, so that the steam evenly flows in the molding dies and the fusion of the molding particles to each other. Was confirmed to be excellent and excellent mechanical strength was obtained.

[0072]

As described above, in the foamed resin molding die according to the present invention, the steam hole of the first molding die and the second molding die in the state where the first molding die and the second molding die are combined. By arranging the steam holes of the mold at different positions, these first
When the foamable resin particles are filled in the cavity formed by combining the mold and the second molding die and the steam is brought into contact with the foamable resin particles through the steam holes, the steam holes on the first molding die side and the Two
The moving distance of the steam flowing in the cavity through the steam holes on the molding die side can be extended, and the steam can be evenly distributed in the cavity.As a result, there is no variation in the fusion state of the expandable resin particles. A strong molded product can be obtained. Moreover, since the foamed resin molding die according to the present invention can evenly spread the steam in the cavity, the amount of steam used can be reduced and the manufacturing cost can be reduced.

The foamed resin molded article according to the present invention is the first
Obtained by using a foamed resin molding die having a configuration in which the steam holes of the first molding die and the steam holes of the second molding die are displaced in a state in which the molding die and the second molding die are combined. Therefore, when the expandable resin particles are filled in the cavity formed by combining the first and second molds and the steam is brought into contact with the expandable resin particles through the steam holes, the first mold The moving distance of the steam flowing in the cavity is extended through the steam hole on the side of the second mold and the steam hole on the side of the second molding die, so that the steam can be evenly distributed in the cavity, and as a result, the fusion of the expandable resin particles The variation of the state disappears and the strength becomes high.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an apparatus showing an example of a molding apparatus including a foamed resin molding die according to the present invention.

FIG. 2 is a diagram showing an example of a foamed resin molded product according to the present invention, (a) is a perspective view of the molded product, and (b) is an enlarged view of part (b) of (a).

FIG. 3 is a perspective view of an essential part showing a first embodiment of a foamed resin molding die according to the present invention.

FIG. 4 is a perspective view of a main part of a molding die used in a comparative example.

FIG. 5 is a schematic view showing an arrangement state of steam holes in the first embodiment of the foamed resin molding die according to the present invention.

FIG. 6 is a schematic view showing an arrangement state of steam holes in the second embodiment of the foamed resin molding die according to the present invention.

FIG. 7 is a schematic view showing an arrangement state of steam holes in the third embodiment of the foamed resin molding die according to the present invention.

FIG. 8 is a schematic view showing an arrangement state of steam holes in the fourth embodiment of the foamed resin molding die according to the present invention.

FIG. 9 is a schematic view showing an arrangement state of steam holes in a fifth embodiment of a foamed resin molding die according to the present invention.

FIG. 10 is a schematic diagram showing an arrangement state of steam holes in a sixth embodiment of a foamed resin molding die according to the present invention.

FIG. 11 is a graph showing buckling test results of Example 1 and Comparative Example 1 in Examples.

FIG. 12 is a graph showing buckling test results of Example 2 and Comparative Example 2 in Examples.

FIG. 13 is a graph showing tensile test results of Example 1 and Comparative Example 1 in Examples.

FIG. 14 is a graph showing the results of tensile tests of Example 2 and Comparative Example 2 in Examples.

FIG. 15 is a graph showing bending test results of Example 1 and Comparative Example 1 in Examples.

FIG. 16 is a graph showing bending test results of Example 2 and Comparative Example 2 in Examples.

FIG. 17 is a graph showing buckling test results of Example 3 and Comparative Example 3 in Examples.

FIG. 18 is a graph showing tensile test results of Example 3 and Comparative Example 3 in Examples.

FIG. 19 is a graph showing bending test results of Example 3 and Comparative Example 3 in Examples.

FIG. 20 is a perspective view showing a buckling test measuring apparatus in an example.

FIG. 21 is a perspective view showing a measuring device for a tensile test in an example.

FIG. 22 is a perspective view showing a measuring apparatus for a bending test in the example.

[Explanation of symbols]

1 Female mold (first mold) 2 Male mold (second mold) 7 cavities 22,23 Steam hole 30,31 Steam hole mark 32 areas A molding equipment B Foamed resin molding

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shirou Amano             Tokushima Prefecture Itano-gun Matsushige-machi Nakaki character group 245-44 F-term (reference) 4F212 AA13 AG20 UA01 UB01 UL02

Claims (11)

[Claims] 1. A foaming resin particle is provided in a cavity formed by combining a first molding die having a plurality of steam holes and a second molding die and combining the first molding die and the second molding die. In a foamed resin molding die for filling, and contacting steam with the foamable resin particles through the plurality of steam holes to produce a foamed resin molded article, the first molding die and the second molding die are combined. The foamed resin molding die is characterized in that the steam holes of the first molding die and the steam holes of the second molding die are displaced in this state. 2. The first mold is provided with steam holes vertically and horizontally at a regular pitch, and the steam holes of the second mold do not overlap with the steam holes of the first mold. The foamed resin molding die according to claim 1, wherein the foamed resin molding die is provided vertically and horizontally at regular pitches. 3. The first molding die is provided with the steam holes of the first molding die in a region where a center portion of the steam chamber in which the vertical pitch is divided into three equal parts and a center portion of the steam hole in which the horizontal pitch is divided into three parts are overlapped with each other. The foamed resin molding die according to claim 1 or 2, wherein the center of the steam hole of the molding die of No. 2 is located. 4. The area of the portion facing the cavity is 7
0% or more, in the region where the central portion of the vertical pitch of the steam holes of the first mold divided into three equal parts and the central portion of the horizontal pitch divided into three equal parts are overlapped, The foamed resin molding die according to any one of claims 1 to 3, which has a relationship in which a center of a steam hole of the second molding die is located. 5. The second circle is formed in the area of a small circle that is concentric with the triangular inscribed circle formed by connecting the steam holes of the first mold and has a diameter half that of the inscribed circle. 3. The steam hole of the mold is located at the center of the steam hole.
The foamed resin molding die described in. 6. The area of the portion facing the cavity is 7
0% or more is within the area of a small circle concentric with the inscribed circle of the triangle formed by connecting the steam holes of the first mold and having a diameter half that of the inscribed circle, The foamed resin molding die according to claim 5, having a relationship in which a center of a steam hole of the molding die is located. 7. A foamed resin molding die according to any one of claims 1 to 6 is used to fill a cavity formed by combining a first molding die and a second molding die with foamable resin particles. A foamed resin molded article obtained by bringing steam into contact with the expandable resin particles through a plurality of steam holes. 8. The steam holes on the surface of the molded product are provided vertically and horizontally at a regular pitch, and the center part of the vertical pitch of the steam holes on the first molding die side is divided into three parts, and the horizontal direction. A foamed resin molded product, wherein the center of the steam hole mark on the second molding die side is present in a region where the center part of the pitch divided into three equal parts overlaps. 9. 70% or more of the surface area of the molded product is a center part of the vertical pitch of the steam hole marks on the first molding die side divided into three equal parts and a center part of the horizontal pitch divided into three equal parts. The foamed resin molded product according to claim 8, wherein the center of the steam hole mark on the second molding die side is present in the region where the portion overlaps. 10. A small-sized steam hole on the surface of a molded product is concentric with a triangular inscribed circle formed by connecting the steam holes on the first molding die side and has a diameter half that of the inscribed circle. Within the circle area,
A foamed resin molded article, wherein the center of the steam hole mark on the second molding die side is present. 11. A small product having a surface area of 70% or more of a molded product concentric with a triangular inscribed circle formed by connecting the steam hole marks on the first molding die side and having a diameter half that of the inscribed circle. The foamed resin molded product according to claim 10, wherein the center of the steam hole mark on the second molding die side is present in the area of the circle.