JP2017178409A - Heat insulation container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation container in which a synthetic resin plate enabling further improvement of strengh, adiabaticity, and productivity than conventional heat insulation materials is used as a heat insulation material.SOLUTION: A heat insulation container includes: a bottom plate; side plates erected on a periphery part of the bottom plate; a lid which closes an opening formed by the slide plates; and a heat insulation material disposed at the inner sides of the lid, the bottom plate, and the side plate. The heat insulation material includes: a synthetic resin plate 9; and a heat shielding sheet covering the synthetic resin plate 9. The synthetic resin plate 9 includes: foam layers 9a; a non-foam intermediate layer 9b formed between the foam layers 9a; and a non-foam surface layer 9c formed on an outer surface of the foam layer 9a. The non-foam intermediate layer 9b is thinner than the foam layer 9a.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an insulated container.

  2. Description of the Related Art Conventionally, a cold and warm container that is used when delivering a product that needs to be cold and warm, such as food and medicine, is known (see Patent Document 1 below). The cold insulation container described in Patent Document 1 can be stacked two or more, and includes a bottom plate, a side plate standing on its periphery, and a lid that closes an opening formed by these side plates (the same document). , See claim 1).

  The bottom plate and the side plate are formed of a synthetic resin plate, and a heat shield sheet having a reflective film layer is provided on the surface of the side plate. A plurality of individual heat insulating materials in which a foamed resin plate is covered with a heat insulating sheet are detachably attached to the inner surfaces of the bottom plate and the side plate and the lid. In addition, when the lid closes the opening, the side plate is formed such that the upper end thereof is disposed at substantially the same height as the upper surface of the lid.

  Furthermore, a stopper is provided at the upper end corner of the side plate so that the periphery of the bottom plate of the upper cold insulation container is fitted. The said stopper is formed so that the bottom plate of the cold insulation container accumulated on the upper side may be fitted in the position above the upper surface of the lid. And the outer surface of the said baseplate and the lower part of a side plate are covered with the reinforcement sheet | seat with higher abrasion resistance than the said heat insulation sheet.

Japanese Patent No. 4651919

  The cold insulated container described in Patent Document 1 has excellent strength, good heat insulation performance, easy stacking, low manufacturing costs, and can extend the life of the container. (See the same document, paragraph 0022, etc.). However, there is room for further improvement from the viewpoints of improving the strength of the resin plate used as a heat insulating material, improving heat insulating properties, and improving productivity.

  This invention is made | formed in view of the said subject, and it aims at providing the heat insulation container using the synthetic resin board which can improve an intensity | strength, heat insulation, and productivity as compared with the past as a heat insulating material. .

  In order to achieve the above object, the heat insulating container of the present invention includes a bottom plate, a side plate standing on the peripheral edge of the bottom plate, a lid for closing an opening formed by the side plate, the lid, the bottom plate, and the side plate. A heat insulating container disposed inside the heat insulating material, wherein the heat insulating material includes a synthetic resin plate and a heat insulating sheet covering the synthetic resin plate, and the synthetic resin plate is a foam layer. And a non-foamed intermediate layer formed between the foamed layers and a non-foamed surface layer formed on the outer surface of the foamed layer, the non-foamed intermediate layer being thinner than the foamed layer It is characterized by.

  The heat-insulated container of the present invention is a container used, for example, when delivering a product that needs to be kept warm, such as food and medicine. The bottom plate and the side plate of the heat insulating container can be formed of a synthetic resin plate such as plastic cardboard. Moreover, from a viewpoint of improving the heat insulation of a heat insulation container, a side plate and a lid | cover may each have a heat shield sheet on the surface.

  The heat insulating material can be detachably attached to the bottom plate, the side plate, and the lid. Although the heat insulating material arranged inside the bottom plate and the side plate may be provided integrally, a plurality of heat insulating materials may be arranged inside the bottom plate, the side plate, and the lid, respectively. Each heat insulating material can be detachably disposed inside the bottom plate, the side plate, and the lid, respectively.

  From the viewpoint of improving heat insulating properties, antifouling properties, moisture proof properties, and weather resistance, the heat insulating sheets that cover the surfaces of the heat insulating sheets constituting the heat insulating materials and the side plates and the lids are, for example, resin sheets and the resin sheets. And a reflective film layer formed on the surface of the film.

  The synthetic resin plate constituting the heat insulating material has a foam layer, a non-foamed intermediate layer formed between the foam layers, and a non-foam surface layer formed on the outer surface of the foam layer, It is covered with a heat shield sheet. This synthetic resin board has a non-foamed surface layer on the front and back, a foamed layer between the non-foamed surface layers, and a non-foamed intermediate layer between the foamed layers. In other words, the synthetic resin plate constituting the heat insulating material is a laminated body having non-foamed resin layers and foamed resin layers laminated alternately.

  By having a laminated structure of such a non-foamed resin layer and a foamed resin layer, the synthetic resin plate constituting the heat insulating material is suppressed from radiant heat transfer than a synthetic resin plate made of only non-foamed resin, Not only has high heat insulating properties, but also has higher strength than a synthetic resin plate made only of foamed resin. Moreover, by covering the synthetic resin plate with the heat insulating sheet, not only the heat insulating sheet and the synthetic resin plate, but also the air layer formed between them, the heat insulating property of the heat insulating material is further improved, and the heat insulating container is insulated. Can be improved.

  Moreover, the synthetic resin board which comprises the said heat insulating material WHEREIN: The thickness of the said non-foaming intermediate | middle layer is thinner than the said foaming layer. As the synthetic resin plate having such a configuration, for example, an extruded polystyrene foam heat insulating material can be used. This makes it easy to produce a synthetic resin plate having a foam layer between the front and back non-foam surface layers, and a non-foam intermediate layer thinner than the foam layer between the foam layers. Productivity can be improved.

  Moreover, the said heat insulating material can be equipped with the several said synthetic resin board laminated | stacked. As described above, by using the synthetic resin plate as a laminate, the strength can be significantly improved as compared with the case where the synthetic resin plate is used alone. Furthermore, not only the total thickness of the foamed layer is increased and the heat insulation is improved, but also the heat insulation of the heat insulating material can be further improved by forming an air layer between the synthetic resin plates. it can.

  Moreover, the some synthetic resin board which comprises the said heat insulating material may be connected by the said non-foamed surface layer. As a result, in the process of forming, cutting, and laminating the synthetic resin plate, it is possible to handle a plurality of synthetic resin plates integrally, and compared with the case where each synthetic resin plate is separated, the synthetic resin plate The laminate can be easily manufactured. Therefore, productivity of a heat insulating material can be improved and productivity of a heat insulation container can be improved.

  Moreover, it is preferable that the synthetic resin board which comprises the said heat insulating material has a moisture permeability coefficient of 100 or less. As a result, the synthetic resin plate is prevented from containing moisture, generation of mold, propagation of germs, and the like can be prevented, which is hygienic.

  As can be understood from the above description, according to the present invention, it is possible to provide a heat insulating container using as a heat insulating material a synthetic resin plate capable of improving strength, heat insulating properties, and productivity as compared with the prior art.

The perspective view which shows the state which opened the cover of the heat insulation container which concerns on one Embodiment of this invention. The perspective view which shows the state which closed the lid | cover of the heat insulation container shown in FIG. Sectional drawing which follows the transversal direction of the heat insulation container shown in FIG. The expanded sectional view of the synthetic resin board which comprises the heat insulating material of the heat insulation container shown in FIG. The expanded sectional view which shows the modification of the synthetic resin board shown in FIG. The top view and sectional drawing which show the state which expand | deployed the synthetic resin board shown in FIG.

  Hereinafter, an embodiment of the heat insulating container of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a state in which a lid 4 of a heat insulating container 1 according to an embodiment of the present invention is opened. FIG. 2 is a perspective view showing a state in which the lid 4 of the heat insulating container 1 shown in FIG. 1 is closed. FIG. 3 is a cross-sectional view of the heat insulating container 1 shown in FIG. 2 along the short direction.

  The heat insulating container 1 of the present embodiment includes a bottom plate 2 having a rectangular shape in plan view, a side plate 3 standing on the peripheral edge of the bottom plate 2, a lid 4 for closing an opening 3 a formed by the side plate 3, and the lid 4, a bottom plate 2, and a heat insulating material 8 disposed inside the side plate 3. In the heat insulating container 1 according to the present embodiment, the portions excluding the lower portion of the side plate 3, the lid 4, and the surface of the heat insulating material 8 are covered with the heat shield sheet 5, and the lower portion of the side plate 3 and the surface of the bottom plate 2 are the reinforcing sheet 7. Covered by. In the illustrated example, the lower end of the heat shield sheet 5 that covers the portion excluding the lower portion of the side plate 3 and the upper end of the reinforcing sheet 7 that covers the lower portion of the side plate 3 and the bottom plate 2 are connected by being attached.

  The bottom plate 2 and the side plate 3 can be formed of, for example, a synthetic resin plate. As the synthetic resin plate, for example, a flat plate made of a synthetic resin such as polyethylene, polypropylene, vinyl chloride, polyethylene terephthalate, ABS resin, a reinforced synthetic resin plate having a rib or corrugated structure, plastic corrugated board (honeycomb plate, hollow structure plate, 1 type selected from the group consisting of a low-foamed resin-molded plate is preferable. Among these, a plastic cardboard made of polyethylene or polypropylene which is lightweight and excellent in mechanical strength is preferable. This synthetic resin plate may be transparent, translucent or opaque, and can be colored as desired.

  The lid 4 can be constituted by, for example, a heat insulating sheet 5 fixed to the side plate 3 in a flap shape, and a heat insulating material 8 fixed to the inside of the heat insulating sheet 5. More specifically, for example, among the pair of side plates 3 along the long side portion of the rectangular opening 3 a of the heat insulating container 1, a generally rectangular heat shielding sheet 5 constituting the lid 4 at the upper end portion of one side plate 3. One of the pair of long side portions can be fixed via the connecting portion 10.

  Thereby, as shown in FIG.1 and FIG.2, the lid | cover 4 is attached to the upper end part of the side plate 3 via the connection part 10 so that opening 3a can be opened and closed. Moreover, as shown in FIG. 2, the closure band 4a is provided in the center part of the long side part on the opposite side to the connection part 10 of the lid | cover 4. As shown in FIG. The closure band 4a is detachably engaged with the center of the upper end of the outer surface of the side plate 3 through, for example, a hook-and-loop fastener to maintain the lid 4 closed and prevent the lid 4 from opening unintentionally. To do.

  As shown in FIG. 1, the heat insulating material 8 has a rectangular plate shape, one on the inner side of the bottom plate 2, four on the inner side of the side plate 3, and one on the inner side of the lid 4. In the heat insulating container 1 of the present embodiment, one heat insulating material 8 arranged on the inner side of the bottom plate 2 and four heat insulating materials 8 arranged on the inner side of the side plate 3 are separated and removed in a cross-beam shape. They are combined and arranged so as to surround the accommodating portion for accommodating the article. The heat insulating material 8 inside the bottom plate 2 and the heat insulating material 8 inside the side plate 3 may be provided integrally, or may be fixed to the bottom plate 2 or the side plate 3.

  As for the heat insulating material 8 arrange | positioned inside the lid | cover 4, the upper surface part is fixed to the thermal insulation sheet | seat 5 of the outer side of the lid | cover 4 via a surface fastener, for example, and a peripheral part is attached to the thermal insulation sheet | seat 5 outside the lid | cover 4. Is fixed. When the lid 4 is closed, the heat insulating material 8 disposed inside the lid 4 fits snugly inside the opening 3a of the heat insulating container 1 with almost no gap, and the lower end surface is disposed inside the side plate 3. It is in contact with the upper end surface of the material 8 so as to surround the accommodating portion together with the other heat insulating material 8. As shown in FIG. 3, each heat insulating material 8 includes a synthetic resin plate 9 and a heat shield sheet 5 that covers the synthetic resin plate 9. In addition, the heat insulating material 8 arrange | positioned inside the lid | cover 4 may be attached to the heat shield sheet 5 of the outer side of the lid | cover 4 so that removal is possible, for example via a hook-and-loop fastener.

  4 is an enlarged cross-sectional view of a synthetic resin plate 9 constituting the heat insulating material 8 of the heat insulating container 1 shown in FIG.

  In the heat insulating container 1 of this embodiment, the heat insulating material 8 includes a plurality of laminated synthetic resin plates 9. Each synthetic resin plate 9 includes a foamed layer 9a, a non-foamed intermediate layer 9b formed between the foamed layers 9a, and a non-foamed surface layer 9c formed on the outer surface of the foamed layer 9a. . That is, the synthetic resin plate 9 is a laminate having non-foamed resin layers and foamed resin layers that are alternately laminated.

  The synthetic resin plate 9 can be manufactured by, for example, a material appropriately selected from resin materials conventionally used for manufacturing foamed resin molded products. Examples of the resin material include polystyrene resins such as polystyrene, high impact polystyrene, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, and polyolefin resins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. And polyester resins such as polyethylene terephthalate. As a material of the synthetic resin plate 9, polystyrene resin is particularly preferable because of its strength and good moldability.

  In each synthetic resin plate 9, the non-foamed intermediate layer 9b is thinner than the foamed layer 9a. As the synthetic resin plate 9 having such a configuration, for example, an extrusion-molded body can be used, and for example, an extruded polystyrene foam heat insulating material conforming to JIS A 9511 can be used.

  More specifically, two molded bodies having thin non-foamed resin layers on the front and back sides of the foamed resin layer are extruded and integrated by extrusion so that these non-foamed resin layers overlap in a molten state. Thereby, the synthetic resin board 9 of the 5 layer structure which has the non-foaming intermediate | middle layer 9b between the foaming layers 9a and has the non-foaming surface layer 9c on the front and back can be manufactured easily, and productivity is improved. Can do.

  The thickness of the synthetic resin plate 9 is, for example, 1 mm or more and 20 mm or less, the total thickness of the foamed layer 9a is, for example, 0.5 mm or more and 19.5 mm or less, and the thickness of the non-foamed intermediate layer 9b is For example, it is 0.02 mm or more and 0.2 mm or less, and the thickness of the non-foamed surface layer 9c is, for example, 0.02 mm or more and 0.2 mm or less.

The density of the non-foamed intermediate layer 9b and the non-foamed surface layer 9c is higher than the density of the foamed layer 9a. More specifically, the density of the non-foamed surface layer 9c is, for example, approximately 0.08 g / cm ³ or more and 0.3 g / cm ³ or less, and the density of the foam layer 9a is, for example, approximately 0.02 g / cm ^3. cm ³ or more and 0.11 g / cm ³ or less. Further, the density of the non-foamed intermediate layer 9b is lower than the density of the non-foamed surface layer 9c, and is generally 0.01 g / cm ³ or more and 0.06 g / cm ³ or less. Furthermore, the mechanical strength of the non-foamed intermediate layer 9b and the non-foamed surface layer 9c is higher than the mechanical strength of the foamed layer 9a. The thermal conductivity of the synthetic resin plate 9 is 0.020 W / (m · K) or more and 0.030 W / (m · K) or less.

The synthetic resin plate 9 has a moisture permeability coefficient [ng / (m ² · s · Pa)] of, for example, preferably 100 or less, more preferably 80 or less, and further preferably 60 or less. In the heat insulating container 1 of the present embodiment, the moisture permeability coefficient of the synthetic resin plate 9 used for the heat insulating material 8 can be set to 55 or less, for example. As the moisture permeability coefficient is lower, the amount of water absorption of the synthetic resin plate 9 can be reduced, and the effect of preventing the generation of mold and the propagation of germs can be improved.

  The moisture permeability coefficient is measured by, for example, the cup method of JIS K 7225 or JIS A 1324. However, the test conditions were a temperature of 23 ° C. ± 1 ° C., a relative humidity gradient of 0% + 2.0% on the low humidity side, 50% ± 2% on the high humidity side, and the thickness of the test piece was 25 mm ± 3 mm. However, the synthetic resin plate 9 having the non-foamed surface layer 9c as the skin surface is directly used as a test piece in the state having the non-foamed surface layer 9c. In addition, a sample having a small moisture absorption coefficient or a sample having a hygroscopic property is prepared by preparing a blank test specimen in which a hygroscopic agent is not put in a test container and testing it together with the test specimen. Adjust the mass by adjusting to the mass.

  An air layer 11 is formed between the laminated synthetic resin plates 9. As shown in FIG. 3, the plurality of synthetic resin plates 9 are covered with the heat shield sheet 5, so that an air layer is also formed between the heat shield sheet 5 and the synthetic resin plate 9. The heat insulating material 8 is not necessarily provided with a plurality of laminated synthetic resin plates 9 depending on the thickness of the synthetic resin plate 9, and is constituted by a single synthetic resin plate 9 and a heat shield sheet 5 covering the synthetic resin plate 9. It is also possible to do.

  The heat shield sheet 5 is, for example, a laminated sheet including a synthetic resin film and a reflective film layer that covers the surface of the synthetic resin. As the synthetic resin film, for example, polyester such as polyethylene terephthalate, polyethylene, or the like can be used. As the reflective film layer, for example, a reflective film layer on which aluminum or other metal is vapor-deposited, or a reflective film layer in which aluminum or other metal foils are laminated can be used. Since the heat shield sheet 5 has a reflective film layer, it can prevent the release and intrusion of radiant heat and improve the heat insulation performance of the side plate 3, the lid 4 and the heat insulating material 8, and also the side plate 3, the lid 4. Moreover, high antifouling property, moisture resistance, and weather resistance can be imparted to the heat insulating material 8.

  As the reinforcing sheet 7, a synthetic resin sheet having better scratch resistance than the heat shield sheet 5 is used. Good scratch resistance means that the reinforcing sheet has a surface hardness that makes it difficult to be scratched, or that the reinforcing sheet has moderate flexibility, so that scratch marks are not easily formed. As the reinforcing sheet, an olefin resin sheet such as polypropylene, a vinyl chloride sheet, a synthetic resin laminated sheet, a nonwoven fabric, or the like is used.

  Moreover, the heat insulation container 1 of this embodiment has the stopper 6 in each corner | angular part of the upper end of the side plate 3, as shown in FIGS. The stopper 6 is made of a synthetic resin such as polypropylene or polyethylene and has an L shape in plan view. A recess for fitting the upper end corner of the side plate 3 is provided at the lower portion of the stopper 6. Further, when another heat insulating container 1 having the same configuration as that of the illustrated heat insulating container 1 is stacked on the upper surface of the stopper 6, the corner portion of the bottom plate 2 of the upper heat insulating container 1 is stacked. The plate-shaped convex part which contact | connects the periphery of this is provided, and the corner | angular part of the bottom plate 2 of the upper heat insulation container 1 is fitted.

  Moreover, the heat insulation container 1 of this embodiment has a synthetic resin handle 12 attached to the outer surfaces of both side plates 3 on the short side. The shape, structure, and size of the handle 12 are not particularly limited, and can be appropriately changed according to the use state, design, and the like of the heat insulating container 1. Further, instead of the handle 12, a cloth handle may be attached.

  Hereinafter, the effect | action of the heat insulation container 1 of this embodiment is demonstrated.

  The heat insulating container 1 of the present embodiment is used when, for example, an article that needs to be kept cold or kept warm, such as food or medicine, is stored in a container together with a cooling agent and a heat keeping agent and transported. For example, when transporting frozen foods, block or loose frozen foods are placed in a heat insulating container 1 together with a cooling agent such as dry ice, the lid 4 is closed to insulate, and this is loaded into a vehicle for transportation. To do.

  Here, the heat insulating container 1 of the present embodiment includes a bottom plate 2, a side plate 3 erected on the peripheral edge of the bottom plate 2, a lid 4 that closes an opening 3 a formed by the side plate 3, And a heat insulating material 8 disposed inside the bottom plate 2 and the side plate 3. Thereby, the accommodating part in which the articles | goods inside the heat insulation container 1 are accommodated can be enclosed by the heat insulating material 8 arrange | positioned at the height direction both sides, the width direction both sides, and the depth direction both sides, and heat insulation which has high heat insulation. The container 1 can be obtained. Moreover, the assembly and disassembly of the heat insulation container 1 can be facilitated by disposing the heat insulating materials 8 separately and detachably.

  The heat insulating material 8 includes a synthetic resin plate 9 and a heat shield sheet 5 that covers the synthetic resin plate 9. Thereby, in addition to the heat insulation of the synthetic resin board 9, the heat insulation by the thermal insulation sheet 5 is obtained, and the heat insulating material 8 which has high heat insulation can be obtained. Furthermore, a higher heat insulation effect can be obtained by forming an air layer between the heat shield sheet 5 and the synthetic resin plate 9. Further, when the heat shield sheet 5 has a reflective film layer, the reflective film layer can not only prevent the release and intrusion of radiant heat, but also give the heat insulating material 8 high antifouling properties, moisture resistance, and weather resistance. And the inside of the heat insulating container 1 can be kept clean.

  Moreover, in the heat insulation container 1 of this embodiment, the moisture permeability coefficient of the synthetic resin board 9 is 100 or less. Thereby, the amount of water absorption of the synthetic resin board 9 can be reduced, and generation | occurrence | production of mold | fungi and propagation of various germs can be prevented. In addition, when the moisture permeability coefficient of the synthetic resin plate 9 is 80 or less, the amount of water supply can be further reduced, and when it is 60 or less, the amount of water supply can be further reduced to obtain a higher effect. Can do.

  The synthetic resin plate 9 has a foam layer 9a, a non-foamed intermediate layer 9b formed between the foam layers 9a, and a non-foam surface layer 9c formed on the outer surface of the foam layer 9a. Yes. Thus, by using the synthetic resin plate 9 having a non-foamed resin layer on the surface and having a laminated structure in which the non-foamed resin layer and the foamed resin layer are alternately laminated, the radiant heat transfer is suppressed and the synthetic resin is suppressed. The heat conduction through the plate 9 is reduced. Thereby, the heat insulation performance of the heat insulating material 8 can be improved, and the heat insulation performance of the heat insulation container 1 can be improved. Moreover, the synthetic resin board 9 can be manufactured by an extrusion method, and the productivity of the synthetic resin board 9 can be improved.

  The non-foaming intermediate layer 9b is thinner than the foaming layer 9a. The non-foamed surface layer 9c has a higher density and hardness than the foamed layer 9a, and is superior in strength compared to the foamed layer 9a. Further, the non-foamed intermediate layer 9b between the foamed layers 9a has a lower density and a higher strength than the non-foamed surface layer 9c. Therefore, compared with the conventional synthetic resin board which does not have the non-foaming intermediate | middle layer 9b and the non-foaming surface layer 9c, the intensity | strength of the synthetic resin board 9 is improved, durability improvement of the heat insulating material 8, weight reduction, and thickness reduction Can contribute.

  Moreover, in the heat insulation container 1 of this embodiment, the heat insulating material 8 is provided with the several synthetic resin board 9 laminated | stacked. In this way, by using the synthetic resin plate 9 as a laminate, the strength of the heat insulating material 8 can be significantly improved as compared with the case where the synthetic resin plate 9 is used alone. Furthermore, not only the total thickness of the foamed layer 9a is increased and the heat insulating property is improved, but the heat insulating property of the heat insulating material 8 is further enhanced by the formation of the air layer 11 between the synthetic resin plates 9. Can be improved.

  FIG. 5 is an enlarged sectional view showing a modification of the synthetic resin plate 9 shown in FIG. FIGS. 6A and 6B are diagrams illustrating a state in which the synthetic resin plate 9 illustrated in FIG. 5 is developed, in which FIG. 6A is a plan view and FIG. 6B is a cross-sectional view.

  The plurality of synthetic resin plates 9 may be connected by a non-foamed surface layer 9c as shown in FIG. In the example shown in FIG. 5, the non-foamed surface layers 9 c of the first-layer synthetic resin plate 9 and the second-layer synthetic resin plate 9 facing each other are connected at one end of the second-layer synthetic resin plate 9. Further, the non-foamed surface layers 9c of the second-layer synthetic resin plate 9 and the third-layer synthetic resin plate 9 facing each other are connected at the other end of the second-layer synthetic resin plate 9.

  Similarly, the non-foamed surface layers 9c of the third-layer synthetic resin plate 9 and the fourth-layer synthetic resin plate 9 facing each other are connected at one end of the fourth-layer synthetic resin plate 9. Furthermore, the non-foamed surface layer 9c of the fourth synthetic resin plate 9 and the fifth synthetic resin plate 9 facing each other is connected to the other end of the fourth synthetic resin plate 9. In this way, in the plurality of laminated synthetic resin plates 9, the non-foamed surface layers 9 c of the synthetic resin plates 9 facing each other are alternately connected in a bellows shape at one end and the other end of the synthetic resin plate 9.

  For example, as shown in FIG. 6A, when a plurality of synthetic resin plates 9 are cut out from a large synthetic resin plate 90 that is a base material of the synthetic resin plate 9, the plurality of synthetic resin plates 9 are connected. Can be cut out. More specifically, as shown in the illustrated example, the slits 91 and 92 extending in the short direction of the rectangular large-sized synthetic resin plate 90 are spaced apart in the longitudinal direction of the large-sized synthetic resin plate 90 so that the large-sized synthetic resin plate It can be formed alternately on the front and back of 90.

  As shown in FIG. 6B, the slit 91 cuts the non-foamed surface layer 9c, the foamed layer 9a and the non-foamed intermediate layer 9b on the surface of the large synthetic resin plate 90, leaving the non-foamed surface layer 9c on the back surface. Thus, it can be formed on the surface of the large synthetic resin plate 90. The slit 92 cuts the non-foamed surface layer 9c, the foamed layer 9a, and the non-foamed intermediate layer 9b on the back surface of the large-sized synthetic resin plate 90, and leaves the non-foamed surface layer 9c on the surface to leave the back surface of the large-sized synthetic resin plate 90. Can be formed.

  Moreover, in the example shown to Fig.6 (a), the large sized synthetic resin board 90 can be cut | disconnected in three along a longitudinal direction. The number of cut portions of the large synthetic resin plate 90 and the number of slits 91 and 92 can be appropriately changed according to the size of the large synthetic resin plate 90, the size of the synthetic resin plate 9, and the number of laminated layers. is there. Thereafter, the plurality of synthetic resin plates 9 connected via the non-foamed surface layer 9c are alternately folded in a bellows shape so that the non-foamed surface layers 9c of the adjacent synthetic resin plates 9 are opposed to each other. Thereby, as shown in FIG. 5, the several synthetic resin board 9 connected and laminated | stacked through the non-foaming surface layer 9c can be obtained.

  In this way, in the process in which the plurality of synthetic resin plates 9 constituting the heat insulating material 8 are connected by the non-foamed surface layer 9c, the large synthetic resin plate 90 is formed, and the synthetic resin plate 9 is cut out and laminated. A plurality of synthetic resin plates 9 can be handled integrally. Thereby, compared with the case where each synthetic resin board 9 is isolate | separated, the laminated body of the synthetic resin board 9 can be manufactured easily. Therefore, the productivity of the heat insulating material 8 can be improved and the productivity of the heat insulating container 1 can be improved. Of course, a laminated body of the synthetic resin plates 9 to be folded and stacked may be manufactured by providing slits only on the back surface or the front surface of the large synthetic resin plate 90.

  As described above, according to the present embodiment, it is possible to provide the heat insulating container 1 using the synthetic resin plate 9 capable of improving the strength, heat insulating properties, and productivity as compared with the conventional heat insulating material 8.

  Further, in the heat insulating container 1 of the present embodiment, the bottom plate 2 and the side plate 3 are made of a rigid synthetic resin plate, and a stopper 6 is provided at each corner of the upper end of the side plate 3. Therefore, when stacking a plurality of heat insulating containers 1 up and down, the corners of the bottom plate 2 of the upper heat insulating container 1 are fitted to the stoppers 6 of the lower heat insulating container 1 to prevent displacement and collapse. Can do. Moreover, when loading and unloading the upper heat insulation container 1, the upper heat insulation container 1 can be lifted, the bottom plate 2 can be removed from the stopper 6 of the lower heat insulation container 1, and can be dropped easily.

  Further, in the heat insulating container 1, the outer surface of the bottom plate 2 and the lower portion of the side plate 3 that are easily damaged by being rubbed by the stopper 6 or the like are covered with the reinforcing sheet 7 that is hardly damaged and is not easily torn. Thereby, durability of the outer surface of the bottom plate 2 of the heat insulation container 1 and the lower part of the side plate 3 can be improved, and the lifetime of the heat insulation container 1 can be extended.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Thermal insulation container 2 Bottom plate 3 Side plate 3a Opening 4 Lid 5 Thermal insulation sheet 8 Thermal insulation material 9 Synthetic resin board 9a Foam layer 9b Non-foaming intermediate layer 9c Non-foam surface layer

Claims (4)

A heat insulating device comprising: a bottom plate; a side plate standing on a peripheral edge of the bottom plate; a lid that closes an opening formed by the side plate; and a heat insulating material disposed inside the lid, the bottom plate, and the side plate. A container,
The heat insulating material includes a synthetic resin plate and a heat shield sheet covering the synthetic resin plate,
The synthetic resin plate has a foam layer, a non-foamed intermediate layer formed between the foam layers, and a non-foam surface layer formed on the outer surface of the foam layer,
The heat insulating container, wherein the non-foamed intermediate layer is thinner than the foamed layer.   The heat insulating container according to claim 1, wherein the heat insulating material includes a plurality of laminated synthetic resin plates.   The heat insulation container according to claim 2, wherein the plurality of synthetic resin plates are connected by the non-foamed surface layer.   The heat insulation container according to any one of claims 1 to 3, wherein the synthetic resin plate has a moisture permeability coefficient of 100 or less.

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