JP2011110836A - Foaming resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foaming resin product hardly causing separation of a surface cured layer by forming the surface cured layer by a foaming raw material. <P>SOLUTION: The foaming resin container has a foaming layer 36 with the foaming raw material foam-welded, and includes a melting cured layer 34 consisting of the foaming raw material formed on at least two faces of the container external, and an intermediate layer 35 having a foaming ratio smaller than that of a foaming layer intervened between the melting cured layer 34 and the foaming layer 36. The provision of the intermediate layer 35 increases the joint strength of the foaming layer 36 with the melting cured layer 34. The melting cured layer 34 on at least two faces of the container external enhances the waterproofness, thus broadening application of the container. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a foamed resin container.

  In general, a foamed resin product (for example, a foamed polystyrene material or a foamed ethylene material) is molded by foaming and welding a foamable raw material (foamed beads) sufficiently filled in a mold. Foamable resin products are widely used as packaging materials, building materials, and the like because they are lightweight and have excellent shock absorption and heat insulation properties. Moreover, as shown in Patent Document 1 or Patent Document 2, a foamed resin product in which a skin material is attached to the surface has also been proposed. When the skin material is attached to the surface in this way, the surface is glossy or the waterproof property is improved, so that the use of the foamed resin product can be expanded.

  The foamed resin product shown in Patent Document 1 or Patent Document 2 has a drawback that it is easily peeled off because a skin material made of a member different from the foamed layer is attached. Patent Document 3 proposes a molding method for molding a skin material from a foamable raw material. If the skin material can be molded using the foamable raw material, there is an effect that separation at the time of disposal is unnecessary and it is suitable for recycling.

JP-A-6-55650 JP 2001-277399 A JP-A-6-278143

  In the molding method described in Patent Document 3 described above, the mold is closed leaving an interval in the range of 10 to 150 mm larger than a general cracking interval, and the raw material particles are excessively filled. Then, by repeatedly performing forced mold closing using a hydraulic cylinder, the raw material particles are forced to contact the molding surface and melted.

  However, in this method, it is necessary to close the mold leaving a cracking interval having a size corresponding to the thickness of the hardened surface layer to be generated (Patent Document 3, paragraph [0021]), and the scale of the apparatus is not realistic. It will not be the size. Moreover, in this method, since the magnification of the foam layer cannot be appropriately controlled, desired heat insulation characteristics cannot be obtained. So far, no realistic method for producing a foamed resin container having a hardened surface layer made of a foamable raw material has been proposed.

  Therefore, an object of the present invention is to provide a foamed resin product in which a surface hardened layer is generated from a foamable raw material, and the surface hardened layer is hardly peeled off.

  The foamed resin container of the present invention is a foamed resin container having a foamed layer in which a foamable raw material is foam-welded, and a melt-cured layer made of the foamable raw material formed on at least two surfaces inside or outside the container; And an intermediate layer having a foaming rate smaller than that of the foamed layer interposed between the melt-cured layer and the foamed layer. Thus, by having an intermediate | middle layer, the joint strength of a foamed layer and a melt-hardened layer improves. Further, since the melt-hardened layer is provided on at least two surfaces inside or outside the container, the waterproof property can be enhanced, and the use of the container becomes wide.

  In the foamed resin container of the present invention, the at least two surfaces may be in a relationship in which normals are orthogonal to each other. The melt-cured layer may have a uniform film thickness, and the melt-cured layer may have a thickness of 0.2 mm to 3.0 mm.

  Since the foamed resin container of the present invention has an intermediate layer, it can improve the bonding strength between the foamed layer and the melt-cured layer, and has the melt-cured layer on at least two surfaces inside or outside the container. Waterproofness can be improved.

It is a figure which shows the structure of the molding machine of 1st Embodiment. It is a figure which shows the manufacturing method of 1st Embodiment. It is a figure which shows the process of filling the foamable raw material with a low foaming rate. It is a figure which shows the process of closing a metal mold | die. It is a figure which shows the process of producing | generating a melt-hardened layer. It is a figure which shows the process of filling the foamable raw material with a high foaming rate. It is a figure which shows the process of producing | generating a foaming layer. It is a figure which shows the process of taking out a foamed resin container. It is a figure which shows the foamed resin container produced | generated with the manufacturing method of 1st Embodiment. It is a figure which shows the structure of the molding machine of 2nd Embodiment. It is a figure which shows the process of filling the foamable raw material with a low foaming rate. It is a figure which shows the process of closing a metal mold | die. It is a figure which shows the process of producing | generating a melt-hardened layer. It is a figure which shows the process of filling the foamable raw material with a high foaming rate. It is a figure which shows the process of producing | generating a foaming layer. It is a figure which shows the process of taking out a foamed resin container. It is a figure which shows the foamed resin container produced | generated with the manufacturing method of 2nd Embodiment.

Hereinafter, a method for producing a foamed resin product and a molding machine according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a molding machine 1 according to the first embodiment. The foamed resin container molding machine 1 has a convex mold 10 and a concave mold 40. The molding machine 1 introduces a foamable raw material into a space formed when the convex mold 10 and the concave mold 40 are closed (this is referred to as “molding space”), and melts and welds the foamed resin container. Is molded. In the present embodiment, the convex mold 10 is fixed, and the concave mold 40 is moved with respect to the convex mold 10 to form a molding space. The concave mold 40 may be fixed and the convex mold 10 may be moved.

  The convex mold 10 has a raw material supply pipe 12 for introducing a foamable raw material. A sealing member 14 is provided in the raw material supply pipe 12. The sealing member 14 is movable in the raw material supply pipe 12. When the sealing member 14 moves to the molding space side, the sealing surface 16 attached to the end of the sealing member 14 seals the raw material supply pipe 12, and a part of the wall surface defining the molding space Configure. Thereby, the backflow of the foamable raw material to the raw material supply pipe 12 is prevented. Further, by moving the sealing member 14 until the sealing surface 16 comes to the position A, the raw material can be introduced into the molding space through the raw material supply pipe 12.

  The convex mold 10 has a sliding mold (hereinafter referred to as “front slide”) 18 on the upper surface of the convex portion (the side where the concave mold 40 is located). The front slide 18 is moved back and forth along the closing direction B of the mold by the air cylinder 20. The convex mold 10 also has a slide mold (hereinafter referred to as “side slide”) 22 on the side surface of the convex portion. The side slide 22 is moved back and forth along the direction perpendicular to the mold closing direction B by the air cylinder 24. The side slide 22 corresponds to the “moving mold” of the present invention.

  The convex mold 10 has a hollow structure. The convex mold 10 includes a steam supply port 28 that supplies steam to the internal space 26, a cooling water supply port 30 that supplies cooling water, and a drain pipe 32 that discharges steam or cooling water from the internal space 26. Have. Innumerable minute vent holes are formed in the front slide 18 and the side slide 22. The steam and cooling water supplied to the inside of the convex mold 10 are supplied to the molding space through the vent hole.

  A heat medium circulation path 41 for circulating the liquid heat medium passes through the concave mold 40. By flowing a liquid heat medium through the heat medium circulation path 41, the concave mold 40 can be heated or cooled. The concave mold 40 corresponds to the “heating mold” of the present invention. In the present embodiment, an example in which the concave mold 40 is heated by flowing a liquid heat medium through the heat medium circulation path 41 has been described. It is also possible to use another heating means.

  The material of the convex mold 10 and the concave mold 40 is, for example, aluminum, brass, or stainless steel. In the present embodiment, when the foamable raw material is melted, it is necessary to close the mold with a higher pressure than when welding. Therefore, a material that can withstand the closing pressure of the mold at the time of melting is selected.

  FIG. 2 is a view showing the manufacturing process of the foamed resin container, and FIGS. 3 to 8 are views showing the movement of the molding machine 1 in each step. Hereinafter, with reference to FIGS. 2-8, the manufacturing method of the foamed resin container of this Embodiment is demonstrated.

  As shown in FIG. 2, first, by circulating a liquid heat medium having a temperature equal to or higher than the melting point of the foamable raw material (for example, 150 ° C.) through the heat medium circulation path 41 of the concave mold 40, the concave mold 40. Is heated (S10). In this state, the front slide 18 of the convex mold 10 is moved toward the concave mold 40 (S10), and in this state, the concave mold 40 is brought close to the convex mold 10. At this stage, as shown in FIG. 3, the convex mold 10 and the concave mold 40 are not completely closed, but a slight gap is opened. This gap is called “cracking interval”. The order of the movement of the front slide 18 and the closing of the mold does not necessarily have to be the order described above. After closing the mold leaving a cracking interval, the front slide 18 is moved in the direction of the concave mold 40. You may let them.

  Next, a foaming raw material having a low foaming rate (for example, 3 to 20 times) is supplied through the raw material supply pipe 12, and the molding space is filled (S12). As the foaming raw material, for example, foamed styrene beads containing 5 to 20% butadiene are used. By blowing air toward the molding space, the foamable raw material is poured into the molding space. The air flowing into the molding space escapes to the outside through the vent hole and the cracking interval.

  After filling the molding space with the foamable raw material, as shown in FIG. 4, the concave mold 40 is pressed against the convex mold 10 to close the mold and close the molding space (S14). Further, the sealing member 14 is moved to the concave mold 40 side, and the outlet of the raw material supply pipe 12 is closed by the sealing surface 16.

  Subsequently, as shown in FIG. 5, the side slide 22 of the convex mold 10 is moved in a direction approaching the side of the concave mold 40 (S <b> 16). The foamable raw material in the molding space is pressed against the side surface of the concave mold 40. Here, high-temperature steam is supplied from the convex mold 10 into the molding space (S18). Specifically, steam at a high temperature of 100 ° C. or higher (for example, 110 ° C.) pressurized by a high pressure boiler is supplied to the inside 26 of the convex mold 10. The steam supplied to the inside of the convex mold 10 is supplied to the molding space through the vent hole. With respect to the mold closing direction B, the foamable raw material is pressed against the bottom surface of the concave mold 40 by the mold closing pressure. The foamable raw material melts on the side surface and the bottom surface of the concave mold 40 heated to the melting point or higher.

  Next, the surface of the concave mold 40 is cooled by circulating a liquid heat medium having a temperature lower than the melting point of the foamable raw material (for example, 80 ° C.) through the heat medium circulation path 41 of the concave mold 40 (S20). ). The foamable raw material melted on the surface of the concave mold 40 is cured when cooled, and a melt-cured layer 34 is formed. Note that, as the distance from the surface of the concave mold 40 increases, the rate at which the foamable raw material melts decreases, so that a foam layer (hereinafter referred to as “intermediate layer”) 35 in which the foamable raw material having a low foaming rate is welded is formed. . The intermediate layer 35 will be described later.

  The process for forming the melt-cured layer 34 has been described above. In addition, you may repeat said process in multiple times. Thereby, the melt-hardened layer 34 can be thickened and further smoothed.

  Following the production of the melt-cured layer 34, a foam layer is produced. As shown in FIG. 2, the front slide 18 and the side slide 22 of the convex mold 10 are moved away from the concave mold 40 (S22). The cracking interval is opened by slightly separating the convex mold 10 and the concave mold 40. Further, the sealing member 14 in the raw material supply pipe 12 is moved so that the sealing surface 16 comes to the position A. Thereby, the molding machine 1 is in the state shown in FIG. In this state, a foamable raw material having a high foaming rate (for example, 10 to 70 times) is filled through the raw material supply pipe 12 (S24). As the foaming raw material, the same raw material as the raw material of the melt-cured layer 34 is used. Here, although the example using the same raw material is demonstrated, it is good also as using the foaming raw material from which a heat-resistant grade, coloring, a self-extinguishing grade, etc. differ, for example.

  After filling the molding space with the foamable raw material, as shown in FIG. 7, the concave mold 40 is pressed against the convex mold 10 to close the mold and close the molding space (S26). Further, the sealing member 14 is moved to the concave mold 40 side, and the outlet of the raw material supply pipe 12 is closed by the sealing surface 16. In this state, high-temperature steam is supplied to the inside 26 of the convex mold 10 (S26). Here, the steam is pressurized by a high pressure boiler and heated to a high temperature of 100 ° C. or higher. In the present embodiment, steam heated to 110 ° C. is supplied to the inside 26 of the convex mold 10. The steam supplied to the inside of the convex mold 10 is supplied to the molding space through the vent hole. In the molding space, the foamable raw material (expandable beads having a high expansion ratio) is welded by the high-temperature steam, and the foam layer 36 having a high expansion ratio is formed. The foam layer 36 is also welded to the melt-cured layer 34 via the intermediate layer.

  Next, cooling water is supplied into the convex mold 10 (S28). Moreover, the inside of the convex mold 10 is decompressed using a vacuum device (not shown) to evaporate the cooling water. The foamed resin container molded in the molding space is cooled using the latent heat of vaporization at this time. Moreover, the cooling water adhering to the foamable resin is volatilized. Next, as shown in FIG. 8, the convex mold 10 and the concave mold 40 are opened, and the molded foamed resin container 38 is taken out (S30).

  FIG. 9 is a view showing a configuration of the molded foamed resin container 38. The foamed resin container 38 has a melt-cured layer 34 on its outer bottom surface and outer surface. The inside of the container is constituted by a foam layer 36 having a high foaming rate. An intermediate layer 35 having a lower magnification than the foamed layer 36 is interposed between the melt-cured layer 34 and the foamed layer 36. In the figure, for convenience of explanation, the boundary between the melt-cured layer 34 and the intermediate layer 35 is clearly described, but the melt-cured layer 34 and the intermediate layer 35 are generated by the same process, and the foaming rate gradually changes. In fact, the boundaries are not clear. Between the melt-hardened layer 34 and the foamed layer 36, there is an intermediate layer 35 having a foaming rate close to that of the foamed layer 36, so that the melt-hardened layer 34 is difficult to peel off.

  The foamed resin container 38 is a foamed resin container having a foamed layer 36 in which a foamable raw material is foamed and welded. An intermediate layer 35 having a foaming rate smaller than that of the foamed layer 36 interposed between the foamed layer 36, and the intermediate layer 35 is thicker at the connecting portion between the bottom surface and the side surface than the other parts. have. With this configuration, the strength of the foamed resin container 38 can be increased by reinforcing the connection portion where stress is likely to be concentrated by the intermediate layer 35 having a low foaming rate.

  Further, an intermediate layer may be formed near the upper edge of the foamed resin container 38 to increase the strength of the upper edge. Furthermore, the upper edge portion may be heated to form a melt-cured layer.

  In the manufacturing method of the foamed resin product according to the first embodiment, the foamable raw material is pressed against the bottom surface of the concave mold 40 by the mold closing pressure, so that the melt-cured layer 34 can be appropriately generated. Further, since the side slide 22 is moved in the direction approaching the side surface of the concave mold 40 and the foamable raw material is pressed against the side surface, the melt-cured layer 34 can be appropriately generated also on the side surface of the concave mold 40, and the foamed resin container 38. A uniform melt-hardened layer 34 can be generated on the outer bottom surface and the outer surface of the substrate. The thickness of the melt-cured layer 34 is 0.2 to 3.0 mm. Here, the thickness of the melt-cured layer 34 means the thickness of the solid portion of the melt-cured layer 34. Having the melt-cured layer 34 having such a thickness can increase the strength of the foamed resin container.

  In the present specification, “uniform” means a state in which the variation in film thickness of the melt-cured layer 34 is within a range of ± 10% of the center value. By making the melt-cured layer 34 uniform, the strength of the melt-cured layer 34 can be made constant.

  In the manufacturing method of the foamed resin product according to the first embodiment, when the melt-cured layer 34 is generated, the front slide 18 is moved in the direction approaching the concave mold 40 to generate the foamed layer 36. First, it moves in a direction away from the concave mold 40. As a result, molding spaces having different sizes can be formed using one convex mold 10.

  In the manufacturing method of the foamed resin product according to the first embodiment, since the concave mold 40 is heated and cooled using the liquid heat medium, the temperature control of the concave mold 40 can be performed quickly. Conventionally, welding was performed by supplying high-temperature steam to the molding space. However, if steam is to be heated above the melting point of the foamable raw material using this configuration, higher-pressure steam is required. become. For example, the vapor pressure at 110 ° C. is about 0.15 MPa, whereas at 150 ° C., about 0.5 MPa is required. For this reason, it is necessary to arrange a large boiler and to make the piping compatible with high pressure. On the other hand, in the present embodiment using a liquid heat medium, it is not necessary to cope with high pressure.

  In the manufacturing method of the foamed resin product according to the first embodiment, after the melt-cured layer 34 is generated, the foamed layer 36 is generated using a foamable raw material having a high foaming rate. Can be controlled. In the method described in Patent Document 3, the heat insulation during the generation of the surface hardened layer results in controlling the magnification of the foamed layer, so that it is not possible to obtain desired heat insulation characteristics.

  In the above-described embodiment, a fine pattern may be formed in the concave mold 40. Thereby, a fine shape (texture) can be formed on the surface of the melt-cured layer 34.

(Second Embodiment)
FIG. 10 is a cross-sectional view showing the molding machine 2 according to the second embodiment. In the first embodiment, the melt-cured layer is generated on the outer bottom surface and the outer surface of the container. In the second embodiment, the molding machine 2 that generates the melt-cured layer on the inner bottom surface and the inner surface of the container. An example will be described.

  The molding machine of the second embodiment has a convex mold 10a and a concave mold 40a. In the first embodiment, the convex mold 10 includes the raw material supply pipe 16, the front slide 18, and the side slide 22. However, in the second embodiment, the concave mold 40a includes these configurations. ing. In the first embodiment, the concave mold 40 includes the heat medium circulation path 41. However, in the second embodiment, the convex mold 10 a includes the heat medium circulation path 33. That is, the convex mold 10a and the concave mold 40a of the molding machine 2 of the second embodiment are opposite to the convex mold 10 and the concave mold 40 of the molding machine 1 of the first embodiment. Have

  The manufacturing method of the foamed resin container by the molding machine 2 of the second embodiment is basically the same as that of the first embodiment (see FIG. 2). Hereinafter, the operation of the molding machine 2 according to the second embodiment in each processing step will be described with reference to the drawings.

  As shown in FIG. 11, first, a liquid heat medium having a temperature equal to or higher than the melting point of the foamable raw material (for example, 150 ° C.) is circulated in the heat medium circulation path 33 of the convex mold 10 a to thereby project the convex mold. The surface of the mold 10a is heated. The front slide of the concave mold 40a is moved in the direction of the convex mold 10a, and the mold is closed leaving a cracking interval. Next, a foamable raw material having a low foaming rate (for example, 3 to 20 times) is supplied through the raw material supply pipe 42.

  After the foaming raw material is filled into the molding space, as shown in FIG. 12, the convex mold 10a is pressed against the concave mold 40a to close the mold, thereby closing the molding space and the sealing member 44. To close the outlet of the raw material supply pipe 42.

  Subsequently, as shown in FIG. 13, the side surface slide 52 of the concave mold 40a is moved in the direction of the side surface of the convex mold 10a, and foaming is performed on the side surface and the top surface of the convex mold 10a heated to the melting point or higher. Melt the raw material. At this time, high-temperature steam (for example, 110 ° C.) is supplied from the concave mold 40a into the molding space. Next, the surface of the convex mold 10a is cooled by circulating a liquid heat medium having a temperature lower than the melting point of the foamable raw material (for example, 80 ° C.) through the heat medium circulation path 33 of the convex mold 10a. . The foamable raw material melted on the surface of the convex mold 10 a is cured by being cooled to form a melt-cured layer 64.

  The melt-hardened layer 64 is formed by the above process. In addition, you may repeat said process in multiple times. Thereby, the melt-cured layer 64 can be thickened, and the surface of the melt-cured layer 64 can be further smoothed.

  Following the production of the melt-cured layer 64, a foam layer 66 is produced. As shown in FIG. 14, the front slide 48 and the side slide 52 of the concave mold 40a are moved away from the convex mold 10a. The cracking interval is opened by slightly separating the convex mold 10a and the concave mold 40a. Further, the sealing member 44 in the raw material supply pipe 42 is moved until the sealing surface 46 comes to the position A. In this state, a foamable raw material having a high foaming rate (for example, 10 to 70 times) is filled through the raw material supply pipe 42. As the foamable material, the same material as the material of the melt-cured layer 64 is used.

  After the foaming raw material is filled into the molding space, as shown in FIG. 15, the convex mold 10a is pressed against the concave mold 40a to close the mold and close the molding space. Further, the sealing member 44 is moved until the sealing surface 46 is at the same position as the upper surface of the front slide 48, and the outlet of the raw material supply pipe 42 is closed. In this state, high-temperature (for example, 110 ° C.) steam is supplied into the concave mold 40a to form a foam layer 66 having a high foaming rate in the molding space.

  Next, cooling water is supplied to the inside of the concave mold 40a. Moreover, the inside of the concave mold 40a is decompressed using a vacuum device (not shown) to evaporate the cooling water. The foaming resin molded in the molding space is cooled using the latent heat of vaporization at this time. Moreover, the cooling water adhering to the foamable resin is volatilized. Next, as shown in FIG. 16, the convex mold 10a and the concave mold 40a are opened, and the molded foamed resin container 68 is taken out.

  FIG. 17 is a view showing the configuration of the molded foamed resin container 68. As shown in FIG. The foamed resin container 68 has a melt-cured layer 64 on its inner bottom surface and inner surface. The outside of the foamed resin container 68 is constituted by a foamed layer 66 having a high foaming rate. An intermediate layer 65 having a lower magnification than the foamed layer 66 is interposed between the melt-cured layer 64 and the foamed layer 66. Since the intermediate layer 65 is interposed between the melt-cured layer 64 and the foamed layer 66, the melt-cured layer 64 is difficult to peel off.

  The foamed resin container 68 is a foamed resin container having a foamed layer 66 in which a foamable raw material is foam-welded. An intermediate layer 65 having a foaming rate smaller than that of the foamed layer 66 interposed between the foamed layer 66, and the intermediate layer 65 is thicker at the connecting portion between the bottom surface and the side surface than the other parts. have. With this configuration, the strength of the foamed resin container 68 can be increased by reinforcing the connection portion where stress is likely to be concentrated by the intermediate layer 65 having a low foaming rate.

  Moreover, since the intermediate | middle layer 65 is formed in the upper end edge part of the foamed resin container 68, the intensity | strength of an upper end edge part can be raised. Note that the upper edge portion may be heated to form a melt-cured layer.

  In the method for manufacturing a foamed resin product according to the second embodiment, the foamable raw material is pressed against the upper surface of the convex portion of the convex mold 10a by the mold closing pressure, so that the melt-cured layer 64 can be appropriately generated. . In addition, since the side slide 52 is moved in the direction approaching the side surface of the convex mold 10a and the foamable raw material is pressed against the side surface, the melt-hardened layer 64 can be appropriately generated also on the side surface of the convex mold 10a. A uniform melt-hardened layer 64 can be generated on the inner bottom surface and inner side surface of the container 68.

  As in the first embodiment, the method for producing a foamed resin product according to the second embodiment can form molding spaces having different sizes using a single concave mold 40a, and a convex mold. The temperature of the mold 10a can be quickly controlled. Further, the expansion ratio of the foam layer 66 can be appropriately controlled.

  In the above-described embodiment, a fine pattern may be formed on the convex mold 10a. Thereby, a fine shape (texture) can be formed on the surface of the melt-cured layer 64.

  The foamed resin container of the present invention has been described in detail with reference to the embodiment. However, the foamed resin container of the present invention is a container manufactured by the manufacturing method and the molding machine described in the above embodiment. It is not limited.

  As described above, the present invention has the effect that the foamed resin container can improve the bonding strength between the foamed layer and the melt-cured layer by having the intermediate layer. It is useful as a foamed resin container for drain pans, cooler boxes, planters and the like. The foamed resin container of the present invention is not limited to the above-described example, and has heat retention, heat insulation, and buffer performance, and is useful as a container that requires these performances.

DESCRIPTION OF SYMBOLS 1, 2 Molding machine 10 Convex mold 12 Raw material supply pipe 14 Sealing member 16 Sealing surface 18 Front slide 20 Air cylinder 22 Side slide 24 Air cylinder 26 Internal space 28 Steam supply port 30 Cooling water supply port 32 Drain tube 34 melt-cured layer 35 intermediate layer 36 foamed layer

Claims (4)

A foamed resin container having a foamed layer in which a foamable raw material is foam-welded,
A melt-cured layer made of the foamable raw material formed on at least two surfaces inside or outside the container;
An intermediate layer having an expansion ratio smaller than the expansion ratio of the foam layer interposed between the melt-cured layer and the foam layer;
A foamed resin container.   The foamed resin container according to claim 1, wherein the at least two surfaces are in a relationship in which normals are orthogonal to each other.   The foamed resin container according to claim 1, wherein the melt-cured layer has a uniform film thickness.   The thickness of the said melt-hardened layer is 0.2 mm-3.0 mm, The foamed resin container in any one of Claims 1-3.