JP6002515B2 - Molding mold for foamed resin and method for producing foamed resin molded product - Google Patents

Description

The present invention relates to a foamed resin molding die and a method for producing a foamed resin molded product by molding a foamed resin molded product using the foamed resin molding die .

  Conventionally, various types of molds for foamed resin are known. For example, a plurality of molds are provided, a void for molding a foamed resin molded product is formed in a mold-closed state, and foam molded in the void is formed. What was comprised so that a some mold may be opened in order to take out a resin molded product is known.

As this type of foamed resin molding die, for example, it is further provided with a plate material for forming a recessed surface that is recessed by one step from the surroundings on the surface of the foamed resin molded product, and characters, symbols, etc. should be indicated by unevenness on the recessed surface. In addition, there is known one in which an unevenness for transferring characters and symbols is formed on one surface side of a plate material.
According to the above mold for foamed resin, a recess having a depth corresponding to the thickness of the plate material is formed on a part of the surface of the foamed resin molded product by the plate material, and the surface of the foamed resin molded product is formed by one surface side of the plate material. A recessed surface can be formed. Moreover, the information regarding the material etc. of a foamed resin molded product can be shown with a character and a symbol in a hollow surface.

  Specifically, for example, the mold for foamed resin, for example, a box-shaped outer mold that opens in one direction, and an outer mold that at least partially enters the inner space of the outer mold when the mold is closed. There are known a plurality of inner molds that form a gap between them, and a plate member is attached to the surface of the inner mold on the side where the gap is formed (Patent Document 1).

Such a molded mold for foamed resin is formed by molding a molded product made of foamed resin in the gap, and then pulling out the inner mold from the inner space so as to pass through the opening of the outer mold and then opening the molded foamed resin molded article. It is configured to take out.
In addition, such a mold for foamed resin is configured to form a recessed surface on the surface of the inner mold in the drawing direction side in the foamed resin molded product. Specifically, in such a molding mold for foamed resin, at the time of molding, the plate material attached to the inner mold is arranged on the drawing direction side of the inner mold in the foamed resin molded product, and the thickness direction of the plate material and the inner mold The plate material is arranged in the same direction as the extraction direction of the sheet, and when the mold is opened, the inner mold is extracted from the inner space of the outer mold to form a recessed surface in the foamed resin molded product by the plate material. ing.

According to such a mold for foamed resin, the plate material has entered by moving the plate material in the thickness direction in the thickness direction at the time of demolding from the state where the plate material enters the recess in the surface of the foamed resin molded product immediately after molding. The plate material can be taken out of the recess. And a hollow surface will be formed by the one surface side of the board | plate material which entered the hollow.
Therefore, in such a mold for foamed resin, the plate material moves in the thickness direction after molding the foamed resin molded product, so that the pressing force by the plate material hardly acts on the periphery of the recessed surface in the foamed resin molded product. . Thereby, such a mold for foamed resin is unlikely to break around the recessed surface of the foamed resin molded product.

JP 2010-167686 A

  On the other hand, as the mold for foamed resin, a mold provided with a plate material arranged so that a recessed surface is formed on the surface on the side different from the take-out direction side of the foamed resin molded product can be considered. Specifically, as the mold for foamed resin, one surface side of the plate material on which the hollow surface of the foamed resin molded product is formed moves along the surface direction of the plate material after molding, and the foamed resin molded product It may be configured to be in sliding contact with the surface. More specifically, as the mold for foamed resin, for example, the mold is opened after molding, and then the plate material enters the depression on the surface of the foamed resin molded product, and then along the surface direction of the plate material. In this case, the foamed resin molded product can be taken out while the foamed resin molded product moves and the one surface side of the plate is in sliding contact with the surface of the foamed resin molded product.

  However, if a molded product is simply molded using such a mold for foamed resin, foaming is performed along the surface direction of the plate material from the state in which the plate material enters the foamed resin molded product when taking out the foamed resin molded product. Since the resin molded product moves, the end portion of the plate material comes into contact with the wall surface surrounding the hollow surface of the foamed resin molded product, and a part of the wall surface can be damaged. That is, such a molding mold for foamed resin has a problem that the periphery of the recessed surface formed on the surface of the foamed resin molded product can be damaged after molding of the foamed resin molded product.

This invention makes it a subject to provide the shaping | molding die for foamed resin which can suppress the damage of the hollow surface periphery formed in the surface of a foamed resin molded product in view of said problems. Moreover, this invention makes it a subject to provide the manufacturing method of the foamed resin molded product which shape | molds a foamed resin molded product using this mold for foamed resin.

In order to solve the above-mentioned problems, a foamed resin molding die according to the present invention is attached to at least one of the plurality of molds that form voids for molding the foamed resin molded article in a closed state, and A plate material that forms a recessed surface that is recessed by one step from the periphery on the surface of the foamed resin molded product, and the plurality of molds are opened in the foamed resin molded product that is molded in the gap and formed with the recessed surface. A mold for foamed resin configured to be taken out,
The plate material is arranged so that one surface side forming the recessed surface is in sliding contact with the foamed resin molded product when the mold is opened or when the foamed resin molded product is taken out, and
The plate material is such that the one surface forming the recessed surface is closer to the surface of the mold to which the plate material is attached, as the tip end side in the relative movement direction with the foamed resin molded product in the sliding contact approaches the forefront. In addition, the surface that is closer to the surface of the mold toward the forefront is formed so as to draw an arc in a cross section obtained by cutting the plate material in the thickness direction along the direction of taking out the foamed resin molded product. It is characterized by that.

The foamed resin molding die having the above-described structure is provided with a plurality of molds that form voids for molding the foamed resin molded product in a closed state, and attached to at least one of the plurality of molds on the surface of the foamed resin molded product. And a plate material that forms a recessed surface that is recessed by one step from the surroundings. Therefore, in the foamed resin molding die, the plate material immediately after molding forms a recess on the surface of the foamed resin molded product, and enters the recess.
In the foamed resin molding die having the above-described configuration, the plate member is slidably contacted with the foamed resin molded product at one surface side forming the recessed surface when the mold is opened or when the foamed resin molded product is taken out. It is arranged so that. That is, the plate material moves in a direction along the recessed surface with respect to the foamed resin molded product from the state of entering the recess immediately after molding, when the mold is opened or when the foamed resin molded product is taken out. At this time, the front side of the plate material in the sliding direction relative to the foamed resin molded product is pressed against a part of the wall surface surrounding the recessed surface formed by the plate material, that is, the front side of the wall material in the relative movement direction. .
However, in the foamed resin molding die having the above-described configuration, the plate material is formed so that one surface that forms a depressed surface is closer to the leading end side in the relative movement direction with the foamed resin molded product. It is formed so as to approach the surface of the attached mold. Moreover, due to the plate material as described above, in the foamed resin molded product, the wall surface on the distal side in the relative movement direction of the plate material among the wall surfaces surrounding the recess surface is gradually reduced from the first step surface around the recess surface toward the recess surface. It is formed to increase the thickness.
Therefore, when the mold is opened or the foamed resin molded product is taken out at the front end side relative to the foamed resin molded product in the plate material and the wall surface surrounding the recessed surface of the foamed resin molded product in contact with the front end side. Even if forces that press against each other occur, the forces are not easily transmitted directly to the wall surface. That is, one surface forming a recessed surface in the plate material is formed so as to approach the surface of the mold to which the plate material is attached, and the relative movement of the plate material with the foamed resin molded product of the wall surface surrounding the recessed surface The tip side in the direction is formed so that the depth of the dent gradually increases toward the dent surface, so that the tip side in the relative movement direction of the plate material with the foamed resin molded product slides on the wall surface at the part pressed against each other. You can move on. Therefore, the wall surface is hardly damaged despite the pressing force generated on the wall surface.
Thus, the mold for foamed resin suppresses damage to the wall surface due to the pressing even when the front end side in the relative movement direction of the plate material with the foamed resin molded product is pressed against the wall surface surrounding the recessed surface. Can do. Therefore, damage around the recessed surface formed on the surface of the foamed resin molded product can be suppressed.

  In the foamed resin molding die of the present invention, it is preferable that the one surface side of the plate material is formed so as to be uneven on the recessed surface.

The method for producing a foamed resin molded product according to the present invention is characterized in that the foamed resin molded product is molded using the foamed resin mold .

  As described above, the mold for foamed resin of the present invention has an effect that it is possible to suppress damage around the recessed surface formed on the surface of the foamed resin molded product.

Sectional drawing which represented typically the cross section which cut | disconnected the shaping | molding die for foamed resins and the foamed resin container main body in the take-out direction of the foamed resin container main body in a mold closed state. The perspective view which looked at the foamed resin container main body shape | molded using the shaping | molding die for foamed resin from diagonally upward. Sectional drawing which represented typically the cross section which cut | disconnected the mold for foamed resin in a mold-closed state and a part of foamed resin container main bodies in the taking-out direction of the foamed resin container main bodies. Sectional drawing which represented typically a part of a mode that the foamed resin container main body after taking out was taken out in a cross section. Sectional drawing which represented typically the cross section which cut | disconnected a part of side wall of the foam resin container main body in which the hollow surface was formed (sectional drawing in the ZZ cross section of FIG. 2). The figure showing the modification of a foamed resin container main body.

  Hereinafter, an embodiment of a molding die for foamed resin according to the present invention will be described with reference to the drawings.

The foamed resin molding die 1 of the present embodiment includes a plurality of molds that form voids for molding the foamed resin molded article 10 in a closed state, and the foamed resin molded article 10 that is attached to at least one of the plurality of molds. And a plate member 4 that forms a recessed surface 12a that is recessed by one step from the periphery, and the foamed resin molded product 10 that is molded in the gap and has the recessed surface 12a is opened by opening the plurality of molds. A mold 1 for foamed resin configured to be taken out,
The plate member 4 is arranged so that one surface side forming the recessed surface 12a is in sliding contact with the foamed resin molded product 10 when the mold is opened or when the foamed resin molded product 10 is taken out, and
The surface of the mold to which the plate material 4 is attached is such that the plate material 4 has one surface forming the depression surface 12a as the tip end side in the relative movement direction with the foamed resin molded product 10 in the sliding contact is toward the forefront. It is formed so that it may approach.

Specifically, as the foamed resin molding die 1 of the present embodiment, for example, as shown in FIG. 1, a box-shaped outer die 2 opened in one direction, and the outer die 2 in a closed state. A plurality of inner molds 3 that at least partially enter the inner space of the outer mold 2 and form gaps with the outer mold 2 as the plurality of molds. And a plate 4 attached to the inner surface of the outer mold 2 to form the outer mold 2.
Moreover, as the foaming resin mold 1 of the present embodiment, for example, as shown in FIG. 2, there is a mold for forming a box-shaped foamed resin container body 10 opened in one direction.

  Hereinafter, the foamed resin molding die 1 for molding the box-shaped foamed resin container body 10 as shown in FIG. 2 will be described in more detail with reference to the drawings.

As shown in FIG. 1, the foamed resin mold 1 is used to mold a foamed resin container body 10 in a gap between the outer mold 2 and the inner mold 3 in a closed state. ,
After forming the foamed resin container body 10, the mold is opened by moving the inner mold 3 relative to the outer mold 2 in the opening direction A of the outer mold 2, and the foamed resin container body 10 is taken out.

When the mold is closed, a gap is formed between the outer mold 2 and the inner mold 3 in the foamed resin mold 1 as shown in FIGS. 1 and 3. And the said mold 1 for foamed resins is comprised so that the foamed resin container main body 10 may be formed in the said space | gap.
In other words, the foamed resin mold 1 is configured so that the raw material of the foamed resin container main body 10 can be sealed in the gap by the outer mold 2 and the inner mold 3 when the mold is closed. And it is comprised so that the foamed resin container main body 10 may be formed by foaming this raw material.

  Specifically, the molding die 1 for foamed resin supplies, for example, raw material beads (preliminary foamed beads) to the gap, expands the raw material beads with, for example, water vapor, and the volume is limited to a predetermined amount. The beads are integrated with each other by fusing the beads to form the foamed resin container body 10.

  The foamed resin mold 1 is configured to open the foamed resin container main body 10 molded in the gap so as to separate the outer mold 2 and the inner mold 3 from each other. .

The foamed resin molding die 1 is formed by, for example, molding a foamed resin container body 10 and then cooling to a predetermined temperature, and the inner die 3 is moved in the opening direction A of the outer die 2 as shown in FIG. It is configured to perform mold opening. That is, the mold 1 for foamed resin is configured to open the mold by extracting the inner mold 3 from the inner space of the outer mold 2 through the opening of the outer mold 2.
As shown in FIG. 4, the foamed resin mold 1 is usually configured to extract the inner mold 3 from the inner space of the fixed outer mold 2 when the mold is opened.

On the other hand, the mold 1 for foamed resin is moved from the inner space of the outer mold 2 by moving the outer mold 2 in the direction opposite to the opening direction A of the outer mold 2 with the inner mold 3 fixed in the mold opening. The inner mold 3 may be extracted. Alternatively, the mold 1 for foamed resin is configured to extract the inner mold 3 from the inner space of the outer mold 2 by moving both the outer mold 2 and the inner mold 3 away from each other when the mold is opened. May be.
In the foamed resin molding die 1 configured as described above, the surface side in contact with the foamed resin container body 10 in the plate material 4 attached to the outer die 2 is foamed as the outer die 2 is moved in the mold opening. It will be in sliding contact with the resin container body 10. The sliding movement direction of the plate material 4 at this time is opposite to the opening direction A of the outer mold 2.

  The foamed resin mold 1 is configured to take out the molded foam resin container body 10 after the mold opening.

Specifically, the foamed resin mold 1 is formed by, for example, extracting the inner mold 3 from the inner space of the fixed outer mold 2 and then placing the foamed resin container body 10 on the outer mold 2 with respect to the outer mold 2. The molded foamed resin container body 10 is taken out by being relatively moved in the opening direction A.
In the foamed resin molding die 1 configured in this way, the foamed resin in the plate material 4 attached to the outer mold 2 is accompanied by moving the foamed resin container body 10 when the foamed resin container body 10 is taken out. The surface side in contact with the container body 10 comes into sliding contact with the foamed resin container body 10. At this time, although the plate material 4 does not move, the plate material 4 moves relative to the foamed resin container body 10 in the direction opposite to the opening direction A of the outer mold 2. The direction opposite to the opening direction A of the outer mold 2 is obtained.

As described above, in the foamed resin mold 1, when the mold opening is performed to extract the inner mold 3 from the inner space of the fixed outer mold 2, the foamed resin container body 10 is further moved to the outer side. By moving the mold 2 in the opening direction A, the foamed resin container body 10 is taken out. In this case, the direction in which the foamed resin container body 10 is taken out is the same direction as the opening direction A of the outer mold 2.
On the other hand, in the mold 1 for foamed resin, when the mold is opened by moving the outer mold 2 in the direction opposite to the opening direction A of the outer mold 2 while the inner mold 3 is fixed, further foaming is performed. By pulling the resin container body 10 away from the inner mold 3 in the direction opposite to the opening direction A of the outer mold 2, the foamed resin container body 10 is taken out. In this case, the direction of taking out the foamed resin container body 10 is opposite to the opening direction A of the outer mold 2.

As shown in FIG. 1, the outer mold 2 is formed in a box shape opened in one direction.
The outer mold 2 is configured to form the outer surface of the foamed resin container body 10 by at least a part of the inner surface. That is, when the mold is closed at the time of molding, the inner surface of the outer mold 2 forming the gap forms the outer surface of the box-shaped foamed resin container body 10.

In the closed state, the outer mold 2 may be arranged so that the opening faces upward as shown in FIG. 1, for example. Further, the outer mold 2 may be arranged so that the opening faces in the lateral direction when the mold is closed.
The outer mold 2 is formed with fine holes penetrating in the thickness direction so as to send water vapor to the raw material beads in the gap when the foamed resin container body 10 is molded.

For example, as shown in FIG. 1, the inner die 3 is formed in a box shape that opens in the same direction as the opening direction A of the outer die 2 in a closed state.
The inner mold 3 is formed with fine holes penetrating in the thickness direction so as to send water vapor to the raw material beads in the gap when the foamed resin container body 10 is molded, like the outer mold 2. .

The inner mold 3 is arranged so that at least a part of the inner mold 3 enters the inner space of the outer mold 2 when the mold is closed.
The inner mold 3 is configured to form the inner surface of the foamed resin container body 10 by at least a part of the outer surface. That is, when the mold is closed at the time of foaming resin molding, the outer surface of the inner mold 3 forming the gap forms the inner surface of the box-shaped foamed resin container body 10.

The plate member 4 is attached to, for example, the outer mold 2 so as to form a recessed surface 12a that is recessed by one step from the periphery on the surface of the foamed resin container body 10.
Specifically, for example, as shown in FIGS. 3 to 5, the plate member 4 is formed on the outer surface of the outer mold 2 so as to form a recessed surface 12 a that is recessed by one step from the periphery on the outer surface of the foamed resin container body 10. Attached to the surface.
According to the plate material 4, the recessed surface 12 a that is recessed by one step from the periphery to the inside can be formed on the outer surface of the foamed resin container body 10. The thickness of the plate member 4 is generally equivalent to the depth of the recess surface 12a formed on the outer surface of the foamed resin container body 10.
That is, according to the plate member 4, the outer surface of the foamed resin container body 10 is formed by the recessed surface 12 a that is recessed inward from the periphery on the outer surface of the foamed resin container body 10 and the wall surface 12 b that surrounds the recessed surface 12 a. A depression is formed in which a part of the surface is depressed.

  In the foamed resin mold 1, the plate 4 has a surface on which one side forming a hollow surface (the side in contact with the foamed resin container body 10) is opened or the foamed resin container body 10 is taken out. Sometimes, it moves along the direction of the recessed surface 12a in the foamed resin container body 10 and is arranged so as to be in sliding contact with the foamed resin container body 10.

Specifically, in the foamed resin molding die 1, for example, as shown in FIG. 1, the plate material 4 is outside so that the thickness direction of the plate material 4 and the take-out direction of the foamed resin container body 10 are perpendicular to each other. Attached to the inner surface of the mold 2.
In the foamed resin mold 1, the plate material 4 is attached to the inner surface of the outer mold 2 as described above, so that the plate material 4 is the plate material 4 when the mold is opened or when the foamed resin container body 10 is taken out. One surface side that moves relative to the foamed resin container main body 10 in the direction along the surface and forms a recessed surface in the plate member 4 comes into sliding contact with the foamed resin container main body 10.

The surface of the mold to which the plate member 4 is attached is such that the plate member 4 has one surface forming the recessed surface 12a as the tip end side in the relative movement direction with the foamed resin container main body 10 in the sliding contact approaches the forefront. It is formed to approach.
Specifically, the plate member 4 is disposed such that the other surface is in contact with the inner surface of the outer mold 2, and further, foaming is performed at the front end side in the relative movement direction with the foamed resin container body 10 in sliding contact. One surface on the side in contact with the resin container body 10 is formed so as to be closer to the inner surface of the outer mold 2 as it approaches the forefront in the relative movement direction.

  More specifically, as shown in FIG. 3, for example, the plate member 4 has an opening of the outer mold 2 on the side opposite to the opening direction A of the outer mold 2 on the side in contact with the foamed resin container body 10. It forms so that it may approach the inner surface of the outer side mold | type 2 to which the said board | plate material 4 was attached, so that it went to the opposite direction of the direction A. As shown in FIG.

As described above, the plate member 4 has a taper portion formed on the side opposite to the opening direction A of the outer mold 2 such that the thickness decreases toward the opposite direction, and in the taper portion. The surface on the side in contact with the foamed resin container body 10 is formed so as to approach the inner surface of the outer mold 2.
That is, the plate member 4 is attached to the inner surface of the outer mold 2 such that the tapered portion having a small thickness faces the distal end side in the relative movement direction with respect to the foamed resin container body 10.

As shown in FIG. 3, the plate material 4 forms a recess in the outer surface of the foamed resin container body 10 immediately after the foamed resin container body 10 is molded, and enters the recess. Further, the plate material 4 moves from the state in which the plate material has entered into the direction perpendicular to the thickness direction of the plate material 4 when the mold is opened or when the foamed resin container body 10 is taken out. That is, the plate material 4 moves in a direction along the recessed surface 12a of the foamed resin container body 10.
At this time, the end portion (the tapered portion described above) on the opposite side to the opening direction A of the outer mold 2 in the plate material 4 is the front end side in the relative movement direction of the foamed resin container body 10 with the foamed resin container body 10 ( It is pressed against the opening direction A of the outer mold 2 on the wall surface 12b.
However, the plate 4 is closer to the inner surface of the outer mold 2 to which the plate 4 is attached, as one surface forming the recessed surface 12a is directed in the direction opposite to the opening direction A of the outer mold 2 as described above. Is formed. Moreover, in the foamed resin container body 10, the wall surface 12 b on the opposite side to the opening direction A of the outer mold 2 in the foamed resin container body 10 is one step higher around the recess surface 12 a. Is formed so as to gradually increase the depth of the recess toward the recess surface 12a.
Therefore, an end portion of the plate 4 opposite to the opening direction A of the outer mold 2 (the tapered portion described above), and a wall surface 12b surrounding the recessed surface 12a of the foamed resin container body 10 in contact with the end portion. In this case, even when forces are pressed against each other when the mold is opened or when the foamed resin container body 10 is taken out, the forces are not easily transmitted directly to the wall surface 12b. That is, in the portions pressed against each other, the end portion (the tapered portion described above) of the plate member 4 on the opposite side to the opening direction A of the outer mold 2 can move so as to slide on the wall surface 12b. Therefore, even if a pressing force is generated on the wall surface 12b on the opposite side of the opening direction A of the outer mold 2 in the wall surface 12b surrounding the recessed surface 12a, the damage to the wall surface 12b due to the force is suppressed.
Thus, according to the foamed resin molding die 1 provided with the plate material 4 as described above, after molding of the foamed resin container body 10, the periphery of the recessed surface 12a formed on the outer surface of the foamed resin container body 10 Can be prevented from being damaged.

The plate member 4 is preferably formed so that one surface side forming the recessed surface 12a is uneven on the recessed surface 12a.
As for the said board | plate material 4, the unevenness | corrugation is formed in one surface side so that a character, a symbol, or a figure may be transcribe | transferred to the said hollow surface 12a, for example. By forming the plate member 4 in this way, characters, symbols, or figures are transferred to the recessed surface 12 a on the outer surface of the foamed resin container body 10. Such a plate material 4 is generally called a name plate.
As described above, in order to transfer characters, symbols, figures, or the like to the recessed surface 12a, one surface side of the plate member 4 is formed so as to be uneven on the recessed surface 12a. Information regarding the material, the contents of the container body 10 made of foamed resin, and the like can be shown on the recessed surface 12a on the outer surface of the container body 10 made of foamed resin.

  The maximum thickness of the plate member 4 is usually 2 to 7 mm.

The plate member 4 is a mold to which the plate member 4 is attached so that one surface forming a hollow surface is closer to the forefront in the relative movement direction at the distal end side in the relative movement direction with the foamed resin container body 10 in sliding contact. It is formed so as to approach the surface.
That is, the side opposite to the opening direction A of the outer mold 2 in the plate material 4 (the tapered portion described above) is a cross section cut in the thickness direction along the take-out direction of the foamed resin container body 10, for example, as shown in FIG. Thus, the surface in contact with the container body 10 may be formed so as to draw an arc. Moreover, in the cross section cut | disconnected similarly, the surface which touches the container main body 10 may be formed so that a straight line may be drawn, for example.

The shape of the plate material 4 is not particularly limited as long as it is a plate shape. For example, the plate material 4 is formed in a polygonal shape such as a rectangular shape or a circular shape when viewed from one side. Or those formed in an elliptical shape.
Specifically, the plate member 4 is formed in a rectangular shape when viewed from one side, for example, and the tapered portion described above is formed along one side of the rectangle as shown in FIGS. And the like.

  The plate member 4 is attached to the mold by general means. For example, the plate member 4 is attached to the inner surface of the outer mold 2 with screws or the like.

  The number of the plate members 4 is not particularly limited, and may be one or plural. Specifically, for example, as shown in FIG. 1, the two plate materials may be provided in the foamed resin mold 1 so that the respective one surfaces face each other.

  The material of the outer mold 2, the inner mold 3, and the plate material 4 is not particularly limited, but is usually a metal.

  Next, the foamed resin molded product of this embodiment will be described with reference to the drawings.

  The foamed resin molded product 10 of this embodiment is formed by the foamed resin mold 1.

The shape and material of the foamed resin molded product 10 are not particularly limited as long as the foamed resin molded product 10 is molded from the foamed resin by using the foamed resin mold 1.
Examples of the foamed resin molded product 10 include a box-shaped foamed resin container body 10 opened in one direction as described above, for example, as shown in FIG.

As shown in FIG. 2, the foamed resin container body 10 has a plate-like bottom wall 11 formed in a rectangular shape and a side wall 12 extending upward from the peripheral edge of the bottom wall 11 and facing upward. It is open.
That is, the foamed resin container body 10 has a rectangular shape in plan view. In the foamed resin container body 10, the opening is formed in a rectangular shape (rectangular shape) by the inner upper end portion of the side wall 12.

  When the foamed resin container body 10 is molded, as described above, the outer mold 2 is disposed outside the container body 10, and the inner mold 3 is disposed inside the container body 10. The opening direction of the container body 10 and the opening direction A of the outer mold 2 are the same direction.

In the foamed resin container body 10, the recessed surface 12 a is formed on the outer surface of the side wall 12. The recessed surface 12a is formed in the outer surface of the foamed resin container body 10 so as to be recessed by one step from the surroundings. In the periphery of the recessed surface 12a, a wall surface 12b surrounding the recessed surface 12a is formed by the plate material 4 described above.
That is, the foamed resin container main body 10 includes a foamed resin container main body 10 including a hollow surface 12a that is recessed inwardly from the periphery on the outer surface of the foamed resin container main body 10 and a wall surface 12b that surrounds the hollow surface 12a. A hollow portion in which a part of the outer surface 10 is depressed is formed.

The recessed surface 12a is usually formed to be recessed by the thickness of the plate member 4 on the outer surface of the foamed resin container body 10. That is, a wall surface 12b having a height corresponding to the thickness of the plate member 4 is usually formed around the recessed surface 12a.
Further, the wall surface 12b on the bottom wall 11 side of the foamed resin container main body 10 is formed so as to gradually increase the depth of the recess from the stepped outer surface around the recess surface 12a toward the recess surface 12a.

  It is preferable that the depression surface 12a has irregularities formed by the plate material 4 described above. For example, as shown in FIG. 2, it is more preferable that characters, symbols, or figures are transferred by the plate material 4 described above. preferable.

The side wall 12 has a rectangular shape in plan view, and is formed in a flat rectangular tube shape. Moreover, it has a pair of short side part which forms the rectangular short side, and a pair of long side part which forms a long side.
Although the thickness of the said side wall 12 is not specifically limited, Usually, it is 8 mm-30 mm.

The bottom wall 11 is formed to have a rectangular shape when viewed from below.
The thickness of the bottom wall 11 is not particularly limited, but is usually 8 mm to 30 mm.

  The foamed resin container body 10 is formed by, for example, a bead foaming method using the foamed resin mold 1 described above. In the foamed resin container body 10, the expanded beads expanded by the bead foaming method are fixed to each other. That is, the foamed resin container body 10 includes expanded beads in which raw material beads (preliminarily expanded beads) are expanded, and is configured by expanded beads fixed to each other.

  Examples of the material of the foam beads include styrene resins such as polystyrene and olefin resins such as polyethylene and polypropylene. As the material of the beads, a styrene resin is preferable in that it is more excellent in moldability.

The polystyrene resin is obtained by polymerizing a styrene monomer. Examples of the polystyrene resin include general-purpose polystyrene resins such as styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, paramethylstyrene, chlorostyrene, bromostyrene, vinyltoluene, and vinylxylene. One type of monomer homopolymer or a copolymer of a plurality of these styrenic monomers can be mentioned. Moreover, a styrene-butadiene copolymer etc. are illustrated.
As the raw material beads, commercially available beads can be used. Examples of the material of the raw material beads include those described above as the material of the foam beads.

  In addition, the said foamed resin container main body 10 may be formed by the foam injection molding method using the molding die 1 for foamed resin mentioned above, for example. Specifically, the foamed resin container body 10 uses, for example, a foamed resin raw material in which a polyol compound, a polyisocyanate compound, a foaming agent, and a reaction catalyst are mixed. You may form by inject | pouring into the space | gap of the shaping | molding die 1, and making it foam.

  The foamed resin container body 10 is formed so as to accommodate the contents therein. Moreover, it is formed so that the contents can be taken in and out through the opening.

  The contents accommodated in the foamed resin container body 10 are not particularly limited, and examples thereof include food such as seafood and vegetables, or industrial products.

The foamed resin mold and foamed resin molded product of the present embodiment are as illustrated above, but the present invention is not limited to the foamed resin mold and foamed resin molded product illustrated above.
Moreover, the various aspects used in the general mold for foamed resin and the foamed resin molded product can be adopted within a range not impairing the effect of the present invention.

For example, the foamed resin container body 10 as the foamed resin molded product described above has a hollow rectangular parallelepiped shape opened in one direction as shown in FIG. The container is not limited to such a shape. The foamed resin container main body 10 as the foamed resin molded product of the present invention may be a hollow cylindrical shape opened in one direction as shown in FIG. 6, for example.
The plate material in the foamed resin molding die for molding such a foamed resin container body 10 has, for example, a curved shape so that the surface in contact with the container at the time of molding corresponds to the shape of the outer surface of the side wall of the container. Is formed.

  Moreover, the molding die for foamed resin of the present invention is not limited to the one for molding a container, and may be for molding a rectangular parallelepiped, for example. Similarly, the foamed resin molded product of the present invention is not limited to a container, and may be, for example, a cylindrical shape or a rectangular parallelepiped shape.

1: Mold for foamed resin,
2: outer mold, 3: inner mold, 4: plate material,
10: Foamed resin container body (foamed resin molded product),
11: Bottom wall, 12: Side wall, 12a: Recessed surface, 12b: Wall surface
A: Opening direction of the outer mold.

Claims (3)

A plurality of molds that form voids for molding the foamed resin molded product in a mold-closed state, and a plate material that is attached to at least one of the plurality of molds and forms a recessed surface that is recessed by one step from the periphery on the surface of the foamed resin molded product A foamed resin mold configured to open the plurality of molds and take out the foamed resin molded article formed in the gap and formed with the recessed surface,
The plate material is arranged so that one surface side forming the recessed surface is in sliding contact with the foamed resin molded product when the mold is opened or when the foamed resin molded product is taken out, and
The plate material is such that the one surface forming the recessed surface is closer to the surface of the mold to which the plate material is attached, as the tip end side in the relative movement direction with the foamed resin molded product in the sliding contact approaches the forefront. In addition, the surface that is closer to the surface of the mold toward the forefront is formed so as to draw an arc in a cross section obtained by cutting the plate material in the thickness direction along the direction of taking out the foamed resin molded product. Mold for resin foam.   The mold for foamed resin according to claim 1, wherein the one surface side of the plate material is formed so as to be uneven on the recessed surface. Using foamed resin mold according to claim 1 or 2 for molding a resin foam product, method for manufacturing the resin foam product.

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