JP5494575B2 - Insulated container and molding method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a heat insulating structural member that is required to have heat insulation properties and strength and rigidity, such as household appliances such as refrigerators, housing equipment products such as bathtubs, industrial materials such as cold cars, and living materials such as cooler boxes. It is.

  As for the heat insulating structural member, conventionally, taking a container used for storing or transporting articles as an example, the one described in Patent Document 1 (Japanese Utility Model Publication No. 6-42657) is known, It has a structure in which the side wall can be expanded with respect to the bottom wall. Further, an assembly container in which the bottom wall and the side wall are made of foamed resin so as to be unfoldable is disclosed in Patent Document 2 (Japanese Utility Model Laid-Open No. 63-86023) or Patent Document 3 (Japanese Patent Laid-Open No. 7-69346). Have been described.

Japanese Utility Model Publication No. 6-42657 Japanese Utility Model Publication No. 63-86023 JP 7-69346 A

  By the way, although the container described in patent document 1 is a hollow double wall structure in a bottom wall and a side wall, it cannot expect high enough heat insulation. Moreover, since the container described in patent document 2 or patent document 3 is a thing of the structure where the bottom wall and the side wall are comprised with the foamed resin, and the hinge part is reinforced with the reinforcement film, The strength is low and the heat insulation is not so high as to be expected.

This invention is made | formed in view of the said situation, and it aims at providing the heat insulation container which is excellent in heat insulation, and has high intensity | strength and rigidity, and its shaping | molding method.

  In order to achieve this object, the present invention has the following features.

The insulated container according to the present invention is
A heat insulating member having a density of 50 to 300 kg / m ³ and continuous foaming microbubbles, and a microbubble part of the continuous foam in a vacuum state of 2 to 0.001 torr enclosed in an oxygen barrier sheet in a vacuum state Is a heat- insulating container that is densely filled inside the wall portion made of a thermoplastic resin ,
The insulated container is
Consists of a bottom wall and side walls connected to each side of the bottom wall;
On the inner surface of the side wall of each side, a groove is formed vertically and horizontally to maintain a space for air circulation between the inner surface and the stored item,
In the case where a box-shaped structure in which the side wall of each side is erected and an upper surface is opened is formed, the concave stripes formed laterally on the inner surface of the side wall of each side are connected in a straight line.

The molding method according to the present invention includes:
A molding method for molding the heat insulating container having an oxygen barrier effect,
A sheet-shaped parison made of a pair of thermoplastic resins extruded from an extrusion head is disposed between the divided molds, and the sheet-shaped parison is brought into contact with the periphery of the cavity of the divided mold, so that the sheet-shaped parison and the cavity Forming a closed space, vacuum sucking air in the space from the cavity surface of the split mold, and closely contacting the sheet parison to the cavity surface of the split mold;
A heat insulating member having a density of 50 to 300 kg / m ³ and continuous foaming microbubbles, and a microbubble part of the continuous foam in a vacuum state of 2 to 0.001 torr enclosed in an oxygen barrier sheet in a vacuum state Is placed between the sheet-shaped parisons in close contact with the cavity surface, the split mold is clamped to closely contact the periphery of the cavities, and the heat-insulating member is densely filled inside the sheet-shaped parison Forming the insulated container,
It is characterized by having.

ADVANTAGE OF THE INVENTION According to this invention, it is excellent in heat insulation and can provide a heat insulation container with high intensity | strength and rigidity.

It is a whole perspective view of an assembly heat insulation container using the heat insulation structure member concerning this embodiment. It is a fragmentary sectional view which shows the structure of the structural wall of the assembly heat insulation container using the heat insulation structural member which concerns on this embodiment. It is a whole perspective view which shows the aspect which folded together a pair of side wall and another pair of side wall. It is sectional drawing which shows the structure wall shaping | molding method of the heat insulation container using the heat insulation structure member of this embodiment, and has shown the process which has arrange | positioned the sheet-like parison between division molds. It is sectional drawing which shows the process which vacuum-sucked the sheet-like parison arrange | positioned between division molds to the cavity surface. It is sectional drawing which shows the process of decorating a heat insulation member in the hollow part of a structure wall. It is sectional drawing which clamps a division mold and blow-molds and shows a process. It is a whole perspective view which expands and shows an assembly heat insulation container using a heat insulation structure member concerning this embodiment. It is a perspective view which shows the aspect which assembled the heat insulation container. It is a fragmentary sectional view which shows the structure of a bottom wall and a side wall.

  FIG. 1 is an overall perspective view of an assembled heat insulating container according to an embodiment of the heat insulating structural member of the present invention, FIG. 2 is a partial cross-sectional view showing the structure of its constituent walls, and FIG. It is a whole perspective view which shows the aspect which folded a pair of side wall together.

  4 to 7 show a method for forming a constituent wall of a heat insulating structural member according to the present invention, FIG. 4 is a cross-sectional view showing a process of arranging a sheet parison between divided molds, and FIG. 5 is a divided mold. FIG. 6 is a cross-sectional view showing a step of vacuum-adsorbing a sheet-like parison disposed between the cavity surfaces, FIG. 6 is a cross-sectional view showing a step of installing a heat insulating member in the hollow portion of the constituent wall, and FIG. It is sectional drawing which shows a process by blow molding.

  FIG. 8 is an overall perspective view showing an assembled and insulated container according to another embodiment of the present invention, FIG. 9 is a perspective view showing an assembled state of the insulated container, and FIG. 10 is a view of the bottom wall and side walls. It is a fragmentary sectional view showing composition.

  The assembly heat insulation container shown in FIGS. 1 to 3 includes a bottom wall 1 and four side walls connected to the four sides of the bottom wall 1 by a pivoting structure, that is, a pair of opposing side walls 2a and 2b and other opposing side walls. It consists of a pair of side walls 2c and 2d. On the inner surfaces of the pair of side walls 2a, 2b and the other pair of side walls 2c, 2d, recesses 2e are formed vertically and horizontally. The concave strip 2e is used to maintain a space for air circulation between the inner surface of the assembled heat insulating container and the stored item, and is used to improve the convection of cold air and warm air inside.

  In this heat insulating assembly container, the bottom wall 1 and the four side walls 2a to 2d have a hollow double wall structure formed by blow molding a thermoplastic synthetic resin (for example, high density polyethylene, polypropylene, engineering plastic).

  In the heat insulating assembly container, a pair of opposing side walls 2a and 2b among the side walls 2a to 2d connected to each side of the bottom wall 1 is fixed to the bottom wall 1 side so as to be folded in contact with the upper surface of the bottom wall 1. The other pair of opposing side walls 2c and 2d are fixed to the bottom wall 1 side so as to be folded in contact with the top surfaces of the pair of side walls 2a and 2b folded in contact with the top surface of the bottom wall 1. .

  That is, the shaft stoppers 3 are formed to rise from the upper surface of the bottom wall 1 at the four corners of the bottom wall 1, and the pair of side walls 2 a and 2 b are the upper surfaces of the bottom wall 1. The other side walls 2c and 2d are fixed so that they can be folded in contact with the top surfaces of the pair of side walls 2a and 2b folded in contact with the top surface of the bottom wall 1. Reference numeral 4 denotes a stop shaft, and each of the stop shafts 4 is fitted into a hole provided in the shaft stop portion 3 of the bottom wall 1 to be fixed.

  Locking protrusions 5 are respectively formed on the shaft-stop side edges of the pair of side walls 2a, 2b and the other pair of side walls 2c, 2d, and the corresponding portions of the bottom wall 1 have locking grooves. 6 is formed, and each of the locking projections 5 and the locking groove 6 forms an upright locking structure of each side wall 2a, 2b, 2c, 2d. Since the fitting state between the protrusion 5 and the locking groove 6 is maintained, the side walls 2a, 2b, 2c, and 2d are securely held upright.

As shown in detail in FIG. 2, a heat insulating member 7 is filled in the hollow portion of the bottom wall 1 that forms a hollow double wall structure. This heat insulating member 7 is formed by tightly encapsulating a rigid polyurethane foam 8 with an oxygen barrier sheet 9. The rigid polyurethane foam 8 of the heat insulating member 7 has a density of 50 to 300 Kg / m ³ and continuous foaming fine bubbles 10, and the fine bubble portion is in a vacuum state of 2 to 0.001 torr. is there. A similar heat insulating member 7 is filled in the hollow portions of the pair of side walls 2a and 2b and the other pair of side walls 2c and 2d. In addition, the foam member which comprises the heat insulation member 7 should just be a continuous foam, For example, foams, such as a polystyrene foam other than the rigid polyurethane foam of the said Example, can be used.

  As shown in FIGS. 4 to 7, the constituent walls of the assembled heat insulating container according to the above embodiment, that is, the bottom wall 1, the pair of side walls 2a, 2b, and the other pair of side walls 2c, 2d are blow-molded. It is.

  As shown in FIG. 4, a pair of sheet parisons 11, 11 are arranged between the divided molds 12, 12. In this step, the sliding portions 14 and 14 provided so as to be able to protrude from the cavities 13 and 13 are protruded around the cavities 13 and 13 of the divided molds 12 and 12, and the end surfaces of the sliding portions 14 and 14 are projected. To form a closed space between the sheet parisons 11 and 11 and the cavities 13 and 13 of the split molds 12 and 12.

  Then, as shown in FIG. 5, the space is formed from the surfaces of the cavities 13 and 13 of the split molds 12 and 12 through a slit 15a connected to a vacuum chamber 15 connected to a vacuum pump and a vacuum tank (both not shown). The air inside is vacuum-sucked so that the sheet parisons 11 and 11 are brought into close contact with the surfaces of the cavities 13 and 13 of the split molds 12 and 12. Next, as shown in FIG. 6, the above-described heat insulating member 7 is arranged between the pair of sheet parisons 11, 11 between the divided molds 12, 12, and as shown in FIG. 12 is clamped, and the periphery of the cavities 13 and 13 is brought into close contact with each other to form a pinch-off, and the blow pin 16 is inserted into one sheet-like parison 11 and a pressurized fluid is introduced thereinto to form a hollow double-wall structure. Form the building wall. The blow pin 16 can be completely inserted by forming a vacuum suction portion at the tip thereof and holding the sheet-like parison 11 once at the tip of the blow pin 16. The blow hole formed by the blow pin 16 is sealed by welding after the molded product is sufficiently cooled.

  In other embodiments of the present invention shown in FIGS. 8 to 10, the assembly heat insulating container is composed of a bottom wall 1, a pair of side walls 2 a and 2 b and a pair of other side walls 2 c and 2 d on each side. Are connected by a thin-walled integrated hinge 17, and the bottom wall 1, the pair of side walls 2a, 2b and the other pair of side walls 2c, 2d have a hollow double wall structure. The bottom wall 1, the pair of side walls 2a, 2b, and the other pair of side walls 2c, 2d are filled with a heat insulating member 7 similar to that of the embodiment shown in FIGS. Reference numeral 18 denotes a handle portion, 19 denotes a latch receiver, and 20 denotes a latch.

  In this embodiment, blow-molding is performed in the developed form shown in FIG. 8, and the heat insulating member 7 is filled in the hollow portion of the constituent wall in the blow molding process. The thin-walled hinge 17 is formed by compressing the parison in the blow molding process.

  In the above embodiment, the pressure fluid is finally introduced into the blow molding, but in the molding of the present invention, the introduction of the pressure fluid is not necessarily required, and the periphery of the sheet parison is simply brought into close contact with each other. A pinch-off portion can be formed to complete a resin hollow molded product.

  The heat insulating component according to the present invention includes household appliances such as refrigerators, rice cookers, jar pots, trouser presses, housing equipment products such as unit baths, bathtubs and toilet seats, cold storage cars, cold storage tanks, freezers, refrigerators, etc. Materials, building materials such as insulation panels, living materials such as cooler boxes, pizza delivery boxes, and lunch boxes.

The heat insulating structural member according to the present invention is continuously foamed at a density of 50 to 300 Kg / m ³ in the hollow portions of the bottom wall 1, the pair of side walls 2 a and 2 b and the other pair of side walls 2 c and 2 d, which are constituent walls. The heat insulating member 7 which has fine bubbles and the fine bubble portion is in a vacuum state of 2 to 0.001 torr enclosed with an oxygen barrier sheet is filled, but most of the heat insulating members 7 are in a vacuum state. Therefore, the heat insulation effect is extremely large. In addition, since the inner wall of the assembly heat insulating container is filled with the heat insulating member 7 having a large number of bubbles in a vacuum state, the load resistance from the outside is high and the overall weight is light. The strength and rigidity are extremely large. In addition, since the heat insulating member 7 filled in the constituent walls is tightly enclosed by the oxygen barrier sheet 9, the assembled heat insulating container is excellent in the oxygen blocking effect.

According to the present invention, in the heat insulation structure member having a heat insulation structure, the wall portion forming the heat insulation structure member has a hollow double wall structure, and has a density of 50 to 300 Kg / m ³ and continuous foaming fine bubbles. It is possible to provide a heat insulating structural member with excellent heat insulation and high strength and rigidity by filling a heat insulating member in which a foam with a fine bubble portion of 2 to 0.001 torr is tightly enclosed with an oxygen barrier sheet. In addition, a method for forming the constituent wall can be provided.

DESCRIPTION OF SYMBOLS 1 Bottom wall 2a, 2b A pair of side wall 2c, 2d Another pair of side wall 2e Groove 3 Axle stop part 4 Stop axis | shaft 5 Locking protrusion part 6 Locking groove 7 Heat insulation member 8 Hard polyurethane foam 9 Oxygen barrier sheet 10 Continuous foaming Microbubbles 11, 11 Sheet-shaped parison 12, 12 Split mold 13, 13 Cavity 14, 14 Sliding part 15 Vacuum chamber 15a Slit 16 Blow pin 17 Thin hinge 18 Handle part 19 Latch receiver 20 Latch

Claims (3)

A heat insulating member having a density of 50 to 300 kg / m ³ and continuous foaming microbubbles, and a microbubble part of the continuous foam in a vacuum state of 2 to 0.001 torr enclosed in an oxygen barrier sheet in a vacuum state Is a heat- insulating container that is densely filled inside the wall portion made of a thermoplastic resin ,
The insulated container is
Consists of a bottom wall and side walls connected to each side of the bottom wall;
On the inner surface of the side wall of each side, a groove is formed vertically and horizontally to maintain a space for air circulation between the inner surface and the stored item,
When the side wall of each side is erected to form a box-shaped structure having an open upper surface, the heat sink characterized in that the concave stripes formed laterally on the inner surface of the side wall of each side are connected in a straight line. container. A molding method for molding a heat-insulating container according to claim 1 having an oxygen barrier effect,
A sheet-shaped parison made of a pair of thermoplastic resins extruded from an extrusion head is disposed between the divided molds, and the sheet-shaped parison is brought into contact with the periphery of the cavity of the divided mold, so that the sheet-shaped parison and the cavity Forming a closed space, vacuum sucking air in the space from the cavity surface of the split mold, and closely contacting the sheet parison to the cavity surface of the split mold;
A heat insulating member having a density of 50 to 300 kg / m ³ and continuous foaming microbubbles, and a microbubble part of the continuous foam in a vacuum state of 2 to 0.001 torr enclosed in an oxygen barrier sheet in a vacuum state Is placed between the sheet-shaped parisons in close contact with the cavity surface, the split mold is clamped to closely contact the periphery of the cavities, and the heat-insulating member is densely filled inside the sheet-shaped parison Forming the insulated container,
A method for forming a heat-insulating container, comprising: The method for forming a heat insulating container according to claim 2, further comprising a step of compressing the sheet-like parison to form a thin hinge in the heat insulating container.

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