JP6386771B2 - Thermostatic container - Google Patents

Description

  The present invention includes coffee, coffee beverages, fruit-containing beverages, soft drinks such as green tea, black tea and oolong tea, dairy products such as lactic acid bacteria beverages, milk and milk beverages, cooking and cooked liquid foods such as soup and noodle soup, In addition, the present invention relates to a thermostatic container for storing cooked foods such as curry and stew, and particularly to a thermostatic container used when holding these foods and drinks at an appropriate temperature for a long time.

  The foods and beverages as described above are sold in a state of being heated or cooled by a vending machine (vendor) or a hot warmer such as a retail store. Examples of the container in which the food or drink heated or cooled in this way includes a resin container represented by a plastic bottle, an aluminum can, a steel can, a paper container, or a container made of a composite material of resin and metal. However, they may return to room temperature after a certain period of time since they were sold. In addition, foods and beverages that are sealed by being heated or cooled may gradually approach the normal temperature due to the influence of outside air after opening the container, and may deviate from an appropriate best temperature after a certain period of time.

  In order to keep the temperature of heated or cooled foods and drinks long, generally the outside of the container is wrapped with a highly heat-insulating material such as paper, cloth, nonwoven fabric, etc. Although the method of preventing the contents from coming into contact with the outside air can be given, the effect is temporary and more troublesome.

  Then, the heat insulation container for food-drinks shown to patent documents 1, 2 is proposed. Patent Document 1 discloses a heat insulating container in which a heat insulating heat insulating sheet containing foamed resin is fitted on the outer peripheral surface of a paper container, and Patent Document 2 discloses a heat storage material on the container inner surface that directly contacts the contents. The thermal insulation container by which the thermal storage resin composition containing was apply | coated is disclosed.

JP 2000-271011 A JP 2003-237848 A

  However, since the heat insulation container shown in the above-mentioned Patent Document 1 is only a foam resin incorporated, it is difficult to obtain a sufficient heat insulation effect. For this reason, in this heat insulation container, the content could not be kept at an appropriate temperature for a long time, and there was a problem that sufficient temperature holding performance could not be obtained.

  Moreover, since the heat storage resin composition is exposed on the inner surface of the container, the heat storage container shown in Patent Document 2 has a negative effect on the contents (food and beverages) due to elution of the heat storage material, and the quality of the contents decreases. Is concerned. Furthermore, in this heat insulation container, since the heat storage resin composition in which the heat storage material is dispersed in the base resin (binder) in an emulsion form is applied to the inner surface of the container, the amount of the heat storage material is limited in consideration of adverse effects on the contents. As described above, there is also a problem that sufficient temperature holding performance cannot be obtained.

  The present invention can hold the contents at an appropriate temperature for a long time with respect to the above problems, and has excellent temperature holding performance, can prevent adverse effects on the contents due to a heat storage material, etc., and keeps the contents in high quality. An object of the present invention is to provide a thermostatic container that can be used.

  In order to solve the above problems, the present invention comprises the following means.

[1] An inner container having an opening at the upper end, and an outer container disposed so as to overlap the outer side of the inner container and having an opening at the upper end.
A constant temperature container, wherein a gap between the inner container and the outer container is filled with a cold storage / heat storage material including one of a heat storage material and a cold storage material.

  [2] The thermostatic container according to item 1 above, wherein the cold storage / heat storage material has a temperature holding performance by latent heat.

  [3] The constant temperature container according to item 1 or 2, wherein the cold storage / heat storage material is composed of polyethylene glycol, fats and oils, paraffin, or a mixture in which at least one of a water-absorbing resin or a polysaccharide is added to water.

  [4] The thermostatic container according to any one of items 1 to 3, wherein the heat storage material has a melting point of 15 ° C to 100 ° C.

  [5] The constant temperature container according to any one of items 1 to 3, wherein the regenerator material has a melting point of −10 ° C. to 15 ° C.

  [6] The thermostatic container according to any one of the preceding items 1 to 5, wherein a gap between the inner container and the outer container is set to 0.1 mm to 5 mm.

  [7] The constant temperature container according to any one of items 1 to 6, wherein the inner container is configured by a laminate in which a resin layer is laminated on both surfaces of a metal foil.

[8] A first flange portion projecting outward is formed on the periphery of the upper end opening of the outer container,
A second flange portion is formed on the periphery of the upper end opening of the inner container so as to protrude outward and to be superimposed on the upper surface of the first flange portion,
The preceding item 1 in which the cold storage / heat storage material filled between the outer container and the inner container is sealed by welding the overlapping portion of the first flange part and the second flange part by heat sealing. The constant temperature container of any one of -7.

[9] The upper end portion of the peripheral wall of the outer container is expanded outside to form a stacking stepped portion,
A second flange portion is formed on the periphery of the upper end opening of the inner container so as to protrude outward and to be superimposed on the upper surface of the stepped portion for stacking,
The preceding item 1 in which the cold storage / heat storage material filled between the outer container and the inner container is hermetically sealed by welding an overlapping portion of the stepped portion for stacking and the second flange portion by heat sealing. The constant temperature container of any one of -7.

  [10] The thermostatic container according to any one of items 1 to 9, wherein a lid member is attached so as to close the upper end opening of the inner container.

  According to the thermostatic container of the invention [1], since the cold storage / heat storage material is filled in the gap between the outer container and the inner container, the cold storage / heat storage material is not mixed into the contents, and the content of the mixing Deterioration of the quality of the product can be prevented, and the content can be maintained at a high quality. Furthermore, the amount of cold storage / heat storage material can be increased as needed while preventing the cold storage / heat storage material from being mixed into the contents. It can be reliably held and excellent temperature holding performance can be obtained.

  According to the thermostatic container of the invention [2] [3], the temperature holding performance can be further improved.

  According to the thermostatic container of the invention [4], excellent heat retaining performance can be obtained with certainty.

  According to the constant temperature container of the invention [5], excellent cold insulation performance can be obtained with certainty.

  According to the thermostatic container of the invention [6], an appropriate amount of the cold storage / heat storage material can be filled, and the temperature holding performance can be further improved.

  According to the thermostatic container of the invention [7], the thermal conductivity of the inner container can be improved, and the temperature holding effect by the cold storage / heat storage material can be improved more reliably.

  According to the constant temperature container of the invention [8], the cold storage / heat storage material can be reliably sealed.

  According to the constant temperature container of the invention [9], the cold storage / heat storage material can be reliably sealed, and a plurality of constant temperature containers can be stacked in a stable state.

  According to the constant temperature container of the invention [10], the temperature holding performance can be further improved.

FIG. 1 is a cross-sectional view schematically showing a thermostatic container according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a laminate constituting an inner container in the thermostatic container of the first embodiment. FIG. 3 is a cross-sectional view for explaining a lid material applicable to the thermostatic container of the first embodiment. FIG. 4 is a cross-sectional view showing a laminated body constituting a lid member in the thermostatic container of the first embodiment. FIG. 5 is a cross-sectional view schematically showing a thermostatic container according to a second embodiment of the present invention. FIG. 6 is a sectional view schematically showing a thermostatic container according to a third embodiment of the present invention. FIG. 7 is a sectional view schematically showing a thermostatic container according to a fourth embodiment of the present invention.

<First Embodiment>
FIG. 1 is a cross-sectional view schematically showing a thermostatic container according to a first embodiment of the present invention. As shown in the figure, the thermostatic container of the first embodiment is formed in a cup shape, for example, soft drinks such as coffee, coffee drink, fruit juice drinking water, green tea, tea, oolong tea, soup, etc. This is a container suitable for containing liquid foods.

  The thermostatic container of the present embodiment includes a double container disposed so that the inner container 2 is overlapped inside the outer container 1, and the gap 50 between the double containers 1 and 2, that is, the outer container 1 and the inner container. The gap 50 between the two is filled with the cold storage / heat storage material 5.

  The outer container 1 has an opening at the upper end, and a first flange portion 12 protruding in the horizontal direction toward the outside is integrally formed around the entire periphery of the upper end opening. Furthermore, a stepped portion 15 for stacking is formed by expanding the upper end portion (neck circumference portion) of the peripheral wall of the outer container 1 so as to increase the diameter outward.

 The inner container 2 has an opening at the upper end, and a second flange portion 22 that protrudes in the horizontal direction toward the outside at the periphery of the upper end opening is integrally formed over the entire circumference. The inner container 2 is accommodated in a state of being substantially adapted to the inner side of the outer container 1 so that the second flange portion 22 is superimposed on the upper surface of the stacking step 15 of the outer container 1. A gap 50 is formed between the outer container 1 and the inner container 2.

  The region where the second flange portion 22 of the inner container 2 and the stacking step portion 15 of the outer container 1 overlap (heat seal portion 41) is fixed by being fused (welded) by heat sealing over the entire circumference. The gap 50 between the outer container 1 and the inner container 2 is sealed by the heat seal portion 41.

  As described above, the cold storage / heat storage material 5 is filled in the gap 50 between the double containers 1 and 2. The cold storage / heat storage material 5 is configured by either one of a heat storage material having a heat retention function that suppresses temperature drop (temperature decrease) of the contents, or a cold storage material having a cold insulation function that suppresses temperature rise (temperature increase). .

  The constant temperature container of the present invention can be used as a one-way container (single-use container) or a reuse container (a container that can be used repeatedly).

  In the present embodiment, the material of the outer container 1 is not particularly limited, but a plastic material (resin material) that can be easily molded by injection molding, vacuum molding, pressure molding, vacuum pressure molding or the like is used. It is preferable to use it. Specifically, a general-purpose resin such as polyethylene, polypropylene, or polystyrene can be suitably used as the material of the outer container 1. Further, the outer container 1 is not limited to a single layer structure of resin, and an intermediate layer such as an ethylene vinyl acetate copolymer or the like for imparting barrier properties to the middle of the resin layer, or for imparting impact resistance. Further, a multilayer structure in which an intermediate layer such as an ionomer layer obtained by ion-crosslinking ethylene methacrylic acid with a metal may be used.

  In the present embodiment, the thickness of the outer container 1 is preferably set to 0.1 mm to 2 mm in consideration of strength, processing efficiency, and cost.

  In the present embodiment, the material of the inner container 2 is not particularly defined, but the same material as that of the outer container 1 can be used, and the latent heat effect by the cold storage / heat storage material 5 can be increased by further increasing the thermal conductivity. In order to efficiently transmit the content to the contents, it is preferable to form a laminated structure including a metal layer. That is, as shown in FIG. 2, as the inner container 2, a resin layer 27 such as a heat-fusible film is bonded to one surface (outer surface) of a metal foil 25 such as an aluminum foil via an adhesive 252, and the opposite surface ( It is preferable to use a laminate in which a resin layer 26 such as a heat-fusible film is bonded to the inner surface) via an adhesive 251.

  In the present embodiment, the thickness of the metal foil 25 is preferably 20 μm to 150 μm in consideration of ease of processing and cost. The material of the metal foil 25 is not particularly limited, but it is preferable to use an aluminum foil in consideration of ease of processing and cost.

  As a heat-fusible film used as the resin layers 26 and 27 in the laminate, the same material as that of the outer container 1 is used, or a film that can be heat-sealed to the outer container 1 and the lid 3. Good to use.

  About the resin layer 26, it may replace with the said heat-fusible film and may use a heat resistant stretched film. Further, those not bonded with the resin layer 26 and those coated with a thermoplastic or thermosetting paint can be suitably used.

  In addition, the thickness of the resin layers 26 and 27 such as a resin film may be set to 10 μm to 100 μm in consideration of thermal conductivity at the time of heat sealing with respect to the outer container 1 and the lid material 3 and sealing strength after heat sealing. preferable.

  In the present embodiment, the gap 50 between the outer container 1 and the inner container 2 is 0 at the bottom so that the cold storage / heat storage material 5 filled in the gap 50 between the double containers 1 and 2 spreads over the entire gap. It is preferable to set the shape, dimensions, etc. of the inner container 2 so that it is 1 mm to 5 mm and 0.1 mm to 3 mm at the peripheral side.

  In the present embodiment, the method for producing the inner container 2 is not particularly limited. For example, the laminate (see FIG. 2) is used as a material, and the inner container 2 is made one turn from the outer container 1 by deep drawing or bulging. For example, a method of forming the inner container 2 by forming a small cup-shaped molded product and appropriately cutting off the flange portion of the molded product can be employed.

  In the present embodiment, it is preferable to use a material having a high safety and a latent heat function as the cold storage / heat storage material 5 filled and enclosed in the gap 50 between the double containers 1 and 2.

  Among the cold storage / thermal storage materials 5, the thermal storage material having a heat retaining function includes polyethylene glycols, petroleum waxes such as paraffin wax, refined paraffin wax, microcrystalline wax, polyethylene wax, polypropylene wax, atactic polypropylene wax, and the like. In addition to synthetic waxes, natural waxes such as tree wax, carnauba wax and beeswax, and vegetable oils such as coconut oil and palm oil, lard, animal oils such as beef tallow, gelatin, agar, carrageenan, etc. An aqueous solution can be suitably used. In particular, in the present embodiment, as the heat storage material, it is more preferable to employ a substance having a melting point of 15 ° C. to 100 ° C. in order to keep the contents at an appropriate temperature.

  The heat storage material in this embodiment exhibits heat retention performance in addition to exhibiting heat retention performance due to the latent heat effect of generating heat by phase change from liquid to solid when the temperature of contents such as food and drink is lowered due to the influence of outside air temperature, etc. Since the rate is low, the heat of the heat-retained contents can be prevented from being released to the outside of the container, and the heat retention performance can be further improved.

  Of the cold storage / heat storage material 5, as the cold storage material having a cold storage function, for example, a cold storage material using a mixture of water-absorbing resin such as sodium polyacrylate or polyvinyl alcohol or polysaccharide such as starch added to water is used. Is preferred. In particular, in the present embodiment, it is even more preferable to employ a material having a gel or liquid state at room temperature and a melting temperature of −10 ° C. to + 15 ° C. in order to keep the contents at an appropriate temperature.

  The cold storage material in the present embodiment exhibits cold insulation performance due to a latent heat (melting heat) effect that absorbs heat by changing phase from gel or solid to liquid when the temperature of contents such as food and drink rises due to the influence of outside air temperature and the like. To do.

  The method for enclosing the cold storage / heat storage material 5 in the thermostatic container is not particularly limited. For example, the cold storage / heat storage material 5 is injected into the outer container 1, and the inner container 2 is placed inside the outer container 1. The cold storage / heat storage material 5 is spread evenly around the entire circumference of the container by the pressure at the time of the insertion, and then the inner container 2 is welded and integrated with the outer container 1 as described above. It can be illustrated.

  In the thermostatic container of the present embodiment, the lid member 3 may be attached to seal the contents such as food and drink contained in the inner container 2.

  For example, as shown in FIG. 3A, the entire upper surface of the outer container 1 may be covered with a lid material 3. The lid member 3 has a shape corresponding to the upper surface shape (planar shape) of the outer container 1 including the first flange portion 12. Then, in a state where the outer peripheral edge portion of the lid member 3 is disposed on the upper surface of the first flange portion 12, the region where the outer peripheral edge portion of the lid member 3 and the first flange portion 12 of the outer container 1 overlap (heat seal portion 42). ) And heat-sealed (fused).

  Furthermore, the lid member 3 shown in FIG. 3B covers only the upper surface portion of the inner container 2. The lid member 3 is smaller than the upper end opening of the outer container 1 and has a shape corresponding to the upper surface shape (planar shape) of the inner container 2 including the second flange portion 22. And the area | region (heat seal part) with which the outer peripheral edge part of the cover material 3 and the 2nd flange part 22 of the inner side container 2 overlap in the state which the outer peripheral edge part of this cover material 3 has been arrange | positioned on the upper surface of the 2nd flange part 22 43) is heat-sealed and fused (welded).

  3C covers the entire upper surface of the outer container 1 so as to fit the stacking step 15 of the outer container 1. That is, the lid member 3 is formed with a recessed portion 30 that can be fitted to a portion surrounded by the step portion 15 of the outer container 1 at an intermediate portion excluding the outer peripheral edge portion. The recessed portion 30 of the lid member 3 is adapted to a portion surrounded by the stacking step 15 of the outer container 1 in the thermostatic container, and the outer peripheral edge of the lower surface of the recessed portion 30 of the lid member 3 is the second of the inner container 2. While being installed on the upper surface of the flange portion 22, the outer peripheral edge portion of the lid member 3 is disposed on the upper surface of the first flange portion 12 of the outer container 1. And the area | region (heat seal part 43) where the outer peripheral part of the recessed part 30 of the cover material 3 and the 2nd flange part 22 of the inner side container 2 overlap, the outer peripheral part of the cover material 3, and the 1st flange part of the outer side container 1 At least one of the two heat seal portions 42 and 43 with the region (heat seal portion 42) overlapping with the heat seal portion 42 is heat sealed and welded (fused).

  In the present embodiment, a laminate can be suitably used as the material of the lid member 3. For example, as shown in FIG. 4, a resin layer 36 such as a heat-resistant film is bonded to one surface (upper surface) of a metal foil 35 such as an aluminum foil via an adhesive 351, and an adhesive 352 is bonded to the opposite surface (lower surface). Thus, a laminate in which a resin layer 37 such as a heat-sealing film is bonded can be suitably used.

  Further, in the present invention, the structure of the lid member 3 is not particularly limited. As the metal foil 35, an aluminum-deposited film or a composite material in which paper and a plastic film are combined is used as the lid member 3. You may do it.

  When using a molded product with a recessed portion as shown in FIG. 3 (c) as the lid member 3, a material for the lid member (a laminated structure film or the like) is formed by a deep drawing molding or a stretch molding. What is necessary is just to make it shape in a shape.

  When the lid 3 is heat-sealed to the thermostatic container, the heat-sealable film as the resin layer 37 of the lid 3 is used for the first flange portion 12 of the outer container 1, the stacking step 15, or the inner container 2. The seal width is set to be the same as or smaller than the width of the flange portions 12 and 22 and the width of the stacking stepped portion 15, while being in contact with the second flange portion 22. Specifically, the seal width is set to 0.5 mm to 10 mm, but it is preferable to set the seal width to 0.5 mm to 5 mm in consideration of hermeticity, openability, and economical size of the container. .

  As described above, according to the constant temperature container of the first embodiment, the cold storage / heat storage material 5 is enclosed in the gap 50 between the double container formed by the outer container 1 and the inner container 2, and therefore, the cold storage / heat storage material 5 Can be prevented from eluting into the inside of the inner container 2. For this reason, it can prevent that the cool storage / heat storage material 5 is mixed in contents, such as food-drinks, can prevent that the quality of contents falls by the mixing, and can maintain a content in high quality. .

  Furthermore, by enlarging the size of the gap 50 between the double containers, the amount of the cold storage / heat storage material 5 can be appropriately increased as necessary. For this reason, for example, by expanding the gap 50 and increasing the amount of the cold storage / heat storage material 5, the contents can be reliably held at an appropriate temperature for a long time, and excellent temperature holding performance can be obtained. Can be further improved.

Second Embodiment
FIG. 5 is a sectional view showing a thermostatic container according to a second embodiment of the present invention. As shown in the figure, the thermostatic container of the second embodiment is formed in a tray shape, and is a container suitable for containing cooked foods such as curry and stew as contents.

  The constant temperature container of the second embodiment is formed to have a wider and shallower portion for storing the contents than the constant temperature container of the first embodiment.

  In this 2nd Embodiment, since the other structure is substantially the same as the thermostat container of the said 1st Embodiment, the same code | symbol is attached | subjected to the same or an equivalent part, and duplication description is abbreviate | omitted.

  Also in the thermostatic container of the second embodiment, the lid member 3 may be attached in the same manner as shown in FIGS. 3A to 3C as in the first embodiment.

  In the constant temperature container according to the second embodiment, similar effects can be obtained as described above.

<Other embodiments>
FIG. 6 is a cross-sectional view showing a constant temperature container according to a third embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a constant temperature container according to a fourth embodiment. As shown in both drawings, the thermostatic containers of the third and fourth embodiments are the first and second embodiments shown in FIGS. 1 and 5 in that the outer container 1 is not formed with the stepped portion 15 for stacking. This is greatly different from the thermostatic container of the embodiment.

  That is, in the thermostatic containers of the third and fourth embodiments, the peripheral wall of the outer container 1 is formed in a cylindrical shape without a step. Furthermore, the 2nd flange part 22 of the inner side container 2 fitted inside the outer side container 1 is arrange | positioned so that it may overlap with the upper surface of the 1st flange part 12 of the outer side container 1. FIG. And the area | region (heat seal part 41) where the 2nd flange part 22 of the inner side container 2 and the 1st flange part of the outer side container 1 overlap is welded (fusion | fused) by heat seal over the perimeter, and a double container is made. The cold storage / heat storage material 5 filled in the gap 50 is enclosed.

  In the thermostatic container of the third and fourth embodiments, when a lid member is attached, the outer peripheral edge portion of the lid member is welded and integrated with the second flange portion 22 of the inner container 2 by heat sealing. Therefore, the inside of the inner container 2 may be sealed.

  In the third and fourth embodiments, the other configurations are substantially the same as those in the first and second embodiments, and therefore, the same reference numerals are given to the same parts or the corresponding parts, and the duplicate description is omitted.

  Also in the third and fourth embodiments, similar effects can be obtained as in the first and second embodiments.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
The constant temperature container (container sample) of Example 1 corresponds to a cup-shaped container as shown in FIG.

  First, the outer container was prepared by the following procedure. That is, as shown in Table 1, a polypropylene chilled cup container having a capacity of 200 ml in which stacking step portions are formed in consideration of stackability when empty containers are stacked on the upper end (neck) of the peripheral wall. The container was prepared by injection molding, and the container was prepared as an outer container (see FIG. 1).

The inner container was prepared by the following procedure. That is, a polypropylene film having a thickness of 30 μm via a two-part curable polyester polyurethane adhesive having a coating amount of 3 g / m ^{2 on} both surfaces of an annealed aluminum alloy foil according to A8079 classified by JIS H4000 having a thickness of 100 μm. Was laminated to prepare a laminate (see FIG. 2), and the laminate was cured at 40 ° C. for 3 days. Thereafter, the laminated body was used as a molding material, and deep-drawn with a die composed of a male mold and a female mold having a capacity of 190 ml, which was slightly smaller than the shape of the outer container, to produce an inner container.

  In addition, the flange part (2nd flange part) of this inner side container was set to 1 mm width over the perimeter together with the width | variety of the step part for stacking of an outer side container.

  A heat storage material as a filler to be filled in the gap between the outer container and the inner container was prepared by the following procedure. That is, 25% by weight of polyethylene glycol having an average molecular weight of 600 (melting point: 15 ° C. to 25 ° C.) and 75% by weight of polyethylene glycol having an average molecular weight of 3000 (melting point: 55 ° C.) are mixed, and the mixture is heated and dissolved at 80 ° C. It was liquefied and prepared as a heat storage material (filler).

  After injecting 10 ml of the liquid heat storage material into the outer container, the inner container is gently inserted immediately from above, and the flange portion (second flange portion) of the inner container is hooked on the stacking step portion of the outer container. It was installed to do. Thereafter, the heat plate heated to 180 ° C. is heat-sealed from the inner container side (upper side) to the flange part of the inner container at a pressure of 0.3 MPa for 2 seconds, and the stacking step part of the outer container and the inner container The heat storage material filled in the gap between the double containers was sealed. Then, it cooled to normal temperature, the heat storage material was solidified, and the container for heat insulation of Example 1 of a double container structure was produced.

<Example 2>
As shown in Table 1, a cup shape having an outer dimension similar to the outer dimension of the inner container in the thermostatic container of Example 1 using a polypropylene sheet having a thickness of 200 μm as a molding material and using a vacuum / pressure air mold. A heat insulation container of Example 2 was produced in the same manner as in Example 1 except that the molded article was molded and the molded article was used as an inner container.

<Example 3>
As shown in Table 1, examples were carried out in the same manner as in Example 1 except that a heat storage material composed of lard (melting point: 30 ° C. to 40 ° C.) heated to 80 ° C. was used instead of polyethylene glycol. 3 heat insulation containers were produced.

<Example 4>
As shown in Table 1, a cold insulation container of Example 4 was produced in the same manner as in Example 1 except that 10 ml of a cold storage material composed of a 1% sodium polyacrylate aqueous solution was used as the filler.

<Comparative Example 1>
As shown in Table 1, a polypropylene chilled cup having a capacity of 200 ml used as an outer container in Example 1 was prepared as a heat / cold container for Comparative Example 1. The container of Comparative Example 1 is not a double container structure but a single container structure, and no cold storage / heat storage material such as a heat storage material is provided.

<Comparative Example 2>
As shown in Table 1, a heat insulation / cold insulation container of Comparative Example 2 was produced in the same manner as in Example 1 except that the gap between the outer container and the inner container was not filled with any filler or the like. .

<Comparative Example 3>
As shown in Table 1, a heat / cold container for Comparative Example 3 was produced in the same manner as in Example 1 except that 10 ml of tap water was used as the filler.

  <Method for evaluating thermal insulation effect>

  A 12 μm thick polyethylene terephthalate (PET) film is laminated on the upper surface of a 12 μm thick aluminum foil via an adhesive, and a 30 μm hot unstretched polypropylene (CPP) is laminated on the lower surface via an adhesive. A lid made of a laminated body (PET12 / adhesive / AL12 / adhesive / CPP30) was prepared. In addition, as the adhesive in the laminate for the lid material, a polyester two-component curable adhesive was used.

  On the other hand, the lid material was placed on the container sample of Example 1 in which 200 ml of room temperature tap water was poured into the inner container, and heat sealed for 2 seconds at a pressure of 0.3 MPa with a hot plate heated to 200 ° C. from the lid material side. The container sample of Example 1 was sealed by fusing and integrating the flange portion (first flange portion) of the outer container of the container sample and the outer peripheral edge of the lid material.

  Three container samples of Example 1 sealed in this way were prepared, and all three container samples were left to stand in a thermostat set at 80 ° C. for 1 hour, respectively, and then taken out of the thermostatic layer and controlled at 24 ° C. Left alone.

  Then, as shown in Table 2, the first container sample was opened immediately after being taken out of the thermostatic chamber into a room controlled at 24 ° C. 10 minutes after the opening and 30 minutes after the opening, the temperature of the water inside the inner container was measured by a temperature sensor to investigate the temperature change in the container sample.

  Further, the second container sample of Example 1 was taken out from the thermostatic chamber to a room controlled at 24 ° C., then left as it is for 10 minutes, the lid was opened, and the container sample was left in its environment immediately after opening. The water temperature in the container sample was measured in the same manner at each time point 10 minutes after opening and 30 minutes after opening.

  Further, the third container sample of Example 1 was taken out of the thermostatic chamber into a room controlled at 24 ° C., then left as it was for 30 minutes, the lid was opened, and the container sample was left in the same environment as above. The water temperature in the container sample was measured at each time point immediately after opening, 10 minutes after opening, and 30 minutes after opening. These results are shown in Table 2.

  The container samples of Examples 2 and 3 and Comparative Examples 1 to 3 were evaluated for the heat retaining effect in the same manner as the container sample of Example 1. These results are shown in Table 2.

  As shown in Table 2, the change in water temperature in each container sample whose lid was opened immediately after taking out from a constant temperature bath of 80 ° C. into a room controlled at 24 ° C. is the case of Examples 1 to 3 related to the present invention. The results were less than those of Comparative Examples 1 to 3 that departed from the gist of the present invention, and it was found that the temperature-retaining effect of the thermostatic container of the present invention is high.

  Moreover, the water temperature in the container sample which opened the lid | cover after 10 minutes and 30 minutes after taking out to the room | chamber interior managed at 24 degreeC is the container sample of Examples 1-3 from the container sample of Comparative Examples 1-3. Since the high temperature was maintained, the heat retention effect (temperature retention performance) was found to be high even in a sealed state.

  <Evaluation method of cooling effect>

  Into the container sample of Example 4, 200 ml of tap water was injected and sealed in the same manner using the same lid material as described above.

  Three container samples of Example 4 sealed in this way were prepared, and all three container samples were left in a refrigerator set at 5 ° C. for 3 hours, and then taken out into a room controlled at 24 ° C., respectively.

  And as shown in Table 3, the first container sample was opened immediately after being taken out of the refrigerator in a room controlled at 24 ° C. At each time point 10 minutes later and 30 minutes after opening, the temperature of the inner container central portion was measured by a temperature sensor to investigate the temperature change in the container sample.

  Furthermore, after removing the container sample of the second example 4 from the refrigerator, the lid is opened in a room controlled at 24 ° C., and the container sample is left in the environment, and immediately after opening and 10 minutes after opening. And the water temperature in a container sample was similarly measured in each time of 30 minutes after opening.

  Furthermore, after taking out the container sample of the third Example 4 from the refrigerator, the lid is opened in a room controlled at 24 ° C., and in the same manner as above, immediately after opening in the state of standing in the environment, The water temperature in the container sample was measured at each time point 10 minutes after opening and 30 minutes after opening. These results are shown in Table 3.

  The container samples of Comparative Examples 1 to 3 were evaluated for the cold insulation effect in the same manner as the container sample of Example 4. These results are shown in Table 3.

  As shown in Table 3, the water temperature change in each container sample whose lid was opened immediately after being taken out from a refrigerator at 5 ° C. into a room controlled at 24 ° C. is the same as that in Example 4 related to the present invention. The results were less than those of Comparative Examples 1 to 3 that deviated from the gist of the above, and it was found that the constant temperature container of the present invention has a high cooling effect.

  Further, 10 minutes after taking out into a room controlled at 24 ° C., the water temperature in the container sample whose lid was opened after 30 minutes was also lower in the container sample of Example 4 than in the container samples of Comparative Examples 1-3. Since the temperature was maintained, it was found that the cooling effect (temperature maintaining performance) was similarly high even in a sealed state.

  The thermostatic container of this invention can be used as a heat / cold container that can hold contents such as food and drink at an appropriate temperature for a long time.

1: Outer container 12: First flange portion 15: Stepped portion for stacking 2: Inner container 22: Second flange portion 25: Metal foil 26: Resin layer (inner container)
27: Resin layer (outside of container)
3: Lid material 30: Recessed part 41: Heat seal part 5: Cold storage / heat storage material 50: Crevice

Claims (7)

An inner container having an opening at the upper end, and an outer container arranged to overlap the outer side of the inner container and having an opening at the upper end,
The gap between the inner container and the outer container is filled with a cold storage / heat storage material containing either one of a heat storage material or a cold storage material,
The inner container is constituted by a laminate in which a heat-fusible resin layer is laminated on both surfaces of a metal foil,
The outer container is made of plastic material;
A first flange projecting outward is formed on the periphery of the upper end opening of the outer container,
A second flange portion is formed on the periphery of the upper end opening of the inner container so as to protrude outward and to be superimposed on the upper surface of the first flange portion,
When the overlapping portion of the first flange portion and the second flange portion is welded by heat sealing, the cold storage / heat storage material filled between the outer container and the inner container is sealed,
The heat-fusible resin layer provided on the lower surface of the lid material is welded to the second flange portion by heat sealing, so that the lid material is attached so as to close the upper end opening of the inner container ,
A thermostatic container , wherein a heat seal portion between the lid member and the second flange portion is disposed on a heat seal portion between the first flange portion and the second flange portion . An inner container having an opening at the upper end, and an outer container arranged to overlap the outer side of the inner container and having an opening at the upper end,
The gap between the inner container and the outer container is filled with a cold storage / heat storage material containing either one of a heat storage material or a cold storage material,
The inner container is constituted by a laminate in which a heat-fusible resin layer is laminated on both surfaces of a metal foil,
The outer container is made of plastic material;
While the upper end portion of the peripheral wall of the outer container is expanded outwardly, a stepped portion for stacking is formed,
A second flange portion is formed on the periphery of the upper end opening of the inner container so as to protrude outward and to be superimposed on the upper surface of the stepped portion for stacking,
The overlapping portion of the stepped portion for stacking and the second flange portion is welded by heat sealing, so that the cold storage / heat storage material filled between the outer container and the inner container is sealed,
The heat-fusible resin layer provided on the lower surface of the lid material is welded to the second flange portion by heat sealing, so that the lid material is attached so as to close the upper end opening of the inner container ,
A thermostatic container , wherein a heat seal part between the lid member and the second flange part is disposed on a heat seal part between the stacking step part and the second flange part .   The constant temperature container according to claim 1 or 2, wherein the cold storage / heat storage material has a temperature holding performance by latent heat.   The constant temperature according to any one of claims 1 to 3, wherein the cold storage / heat storage material is constituted by polyethylene glycol, fats and oils, paraffin, or a mixture in which at least one of a water absorbent resin or a polysaccharide is added to water. container.   The constant temperature container according to any one of claims 1 to 4, wherein the heat storage material has a melting point of 15C to 100C. The constant temperature container according to any one of claims 1 to 4, wherein the regenerator material has a melting point of -10C to 15C.   The constant temperature container according to any one of claims 1 to 6, wherein a gap between the inner container and the outer container is set to 0.1 mm to 5 mm.

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