JP6878667B1 - Insulation material, packing container, and packing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material, a packing container and a packing body which are excellent in heat insulating performance, easy to recycle and can effectively utilize resources. SOLUTION: A heat insulating material 10A includes a storage body 11A in which a defibrated product 20 containing cellulose fibers is stored. The defibrated product 20 is obtained by defibrating used paper. The defibrated product 20 is stored in a closed space formed in the storage body 11A. The packing container includes a storage portion for accommodating an object to be packed and a heat insulating material 10A. The packing body includes a packing container, a packaged object housed in the housing unit, a coolant for cooling the packaged object, and a resin film for sealing the cold air of the coolant. [Selection diagram] Fig. 2

Description

The present disclosure relates to heat insulating materials, packing containers, and packing bodies.

In order to make effective use of resources, various methods for recycling used paper are being studied. When reusing used paper, there is known a technique for loosening the used paper with a defibrator to make it into a fibrous form. For example, Patent Document 1 proposes a technique for producing a defibrated waste paper by dry-defibrating used paper and then removing a piece of paper with a sieving machine provided with a screen. Patent Document 2 proposes a technique for obtaining a defibrated product by defibrating the used paper when producing new paper from the used paper.

Japanese Unexamined Patent Publication No. 2013-147772 Japanese Unexamined Patent Publication No. 2020-84393

The defibrated product obtained by defibrating paper is considered to be used as a raw material for recycled paper, paper boxes, corrugated cardboard boxes, etc., and as a building material. Such paper boxes, corrugated cardboard boxes, and the like are used as packing materials for various items to be packed. On the other hand, styrofoam boxes are often used for packing fresh foods, frozen desserts such as ice cream, and frozen foods, instead of paper boxes and cardboard boxes. It is considered that this is because Styrofoam is lightweight and has a better heat insulating effect than paper boxes and cardboard boxes.

On the other hand, it is difficult to recycle and recycle used Styrofoam. Therefore, from the viewpoint of effective use of resources, it is required to establish a technology that has excellent heat insulating properties and can be easily recycled. Therefore, the present disclosure provides a heat insulating material which is excellent in heat insulating performance, is easy to recycle, and can effectively utilize resources. The present disclosure also provides a packaging container and a packaging body which are excellent in heat insulating performance, are easy to recycle, and can effectively utilize resources.

The present disclosure provides a heat insulating material comprising a storage body containing a defibrated product containing a cellulose fiber. This heat insulating material uses a storage body in which a defibrated product containing cellulose fibers is stored. The defibrated product containing cellulose fibers is superior in heat insulating performance and easy to recycle as compared with conventional heat insulating materials such as Styrofoam. Therefore, the heat insulating material is excellent in heat insulating performance, is easy to recycle, and can effectively utilize resources. Such a heat insulating material is useful for a packaging body because it is lightweight.

The defibrated product is preferably obtained by defibrating used paper. This makes it possible to further promote the effective use of resources. In addition, the manufacturing cost of the heat insulating material can be sufficiently reduced.

The defibrated product is preferably stored in a closed space formed in the storage body. As a result, it is possible to prevent the defibrated product from leaking from the storage body. The packing density of the defibrated product in this closed space ^{is preferably 0.02 g / cm 3} or more. Thereby, the heat insulating performance can be sufficiently high. This packing density is calculated by dividing the mass of the defibrated product by the volume of the enclosed space. It is preferable that the closed space is divided into a plurality of sections. As a result, the volume of one closed space is reduced, so that the local bias of the defibrated material stored in the closed space is reduced, and the heat insulating performance can be further improved.

The storage body is preferably arranged in a packaging container in which frozen foods or frozen desserts are stored. As a result, the quality of frozen foods or frozen desserts can be maintained for a long period of time.

The storage body is preferably made of paper. This reduces the sorting work when disposing of the heat insulating material and the packaging container containing the heat insulating material, promotes recycling, and makes more effective use of resources.

It is preferable that the housing body is provided with a resin film on at least one side. Thereby, the flow of gas can be suppressed, and the cold insulation effect or the heat insulation effect can be further improved.

The present disclosure provides a packaging container comprising a storage unit for accommodating an object to be packed and any of the above-mentioned heat insulating materials. Since this packaging container is provided with any of the above-mentioned heat insulating materials, it is excellent in heat insulating performance. Therefore, the packaged object is excellent in cold insulation and heat retention. In addition, since it is easy to recycle, it is possible to make effective use of resources.

It is preferable that the packing container is provided with the heat insulating material between the housing portion and the box body forming the exterior. As a result, the storage space for the packaged object can be sufficiently increased while maintaining the strength of the packaging container sufficiently.

The box body preferably includes a laminated layer made of resin. Thereby, the flow of gas can be suppressed, and the cold insulation effect or the heat insulation effect can be further improved. In addition, when the storage unit is lower than room temperature, or when the packaging container stored in the refrigerator or freezer is returned to room temperature, the strength of the paper box is reduced or deformed due to the adhesion of dew. It may happen. However, by having the laminated layer on the surface of the paper, the strength of the box body can be maintained even if dew adheres. As a result, it is possible to sufficiently suppress the decrease in strength and deformation due to the adhesion of dew.

The present disclosure includes a packaging body including the packaging container, an object to be packed contained in the storage portion, a coolant for cooling the packaged object, and a resin film layer for sealing the cold air of the coolant. provide. Since this packing body includes any of the above-mentioned packing materials, it is excellent in heat insulating performance. Further, since the resin film layer for sealing the cold air of the coolant is provided, the flow of gas can be suppressed and the cold insulation effect or the heat insulation effect can be sufficiently enhanced. Since such a package is easy to recycle, it is possible to effectively use resources.

It is possible to provide a heat insulating material which is excellent in heat insulating performance, is easy to recycle, and can effectively utilize resources. Further, it is possible to provide a packaging container and a packaging body which are excellent in heat insulating performance, are easy to recycle, and can effectively utilize resources.

It is a perspective view of the heat insulating material which concerns on one Embodiment. It is a perspective view which shows the modification of the heat insulating material of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a perspective view of the packing container (packing body) which concerns on one Embodiment. (A) is a perspective view of a lid portion constituting a packing container. (B) is a perspective view of a box body forming the exterior of the main body portion constituting the packaging container. It is a perspective view which shows the inside of the packing body which concerns on one Embodiment. It is sectional drawing of the packing body at the time of cutting along the line VII-VII of FIG. It is sectional drawing of the packing body (packing container) when it cut along the line VIII-VIII of FIG. It is a photograph of the corrugated cardboard defibrated product used in each example. It is a photograph which shows the example of the produced storage body. (A) is a photograph when the inner surface of the main body of the prepared packing container is covered with a resin film, and (B) is a photograph showing the inside of the prepared lid. (A) is a photograph when the ice cream and dry ice contained in the container are housed in the main body of the packaging container produced in Example 1. (B) is a photograph of the packaging body produced in Example 1 wrapped in a resin bag. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of Example 1. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of Example 2. It is a photograph when the ice cream and dry ice contained in the container are housed in the main body of the packing container produced in Example 3. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of Example 3. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of Example 4. (A) is a photograph showing the inside of the styrofoam packaging container used in Comparative Example 1. (B) is a photograph showing the appearance of the package of Comparative Example 1. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of the comparative example 1. (A) is a photograph showing the corrugated cardboard box used in Comparative Example 2. (B) is a photograph when the ice cream and dry ice contained in the container are housed in the packing container produced in Comparative Example 2. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of the comparative example 2. It is a graph which shows the evaluation result (the time-dependent change of temperature) of the heat insulation performance of the comparative example 3.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings as the case may be. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and duplicate description may be omitted in some cases. In addition, the positional relationship such as up, down, left, and right shall be based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratio of each element is not limited to the ratio shown in the figure.

FIG. 1 is a perspective view of a heat insulating material according to an embodiment. The heat insulating material 10 is composed of a storage body 11 having a box-shaped outer shape. The storage body 11 is configured by stacking a plate body 13, a frame body 12, and a lid body 14 in this order. A defibrated product, which will be described later, is housed inside the storage body 11. The board 13 and the frame 12 may be made of, for example, corrugated cardboard and / or paperboard for paper containers such as coated balls. For example, the corrugated cardboard may be cut out to produce the plate body 13 and the frame body 12 in order to reduce the manufacturing cost.

The frame body 12 has a two-layer structure of the first frame body 12a and the second frame body 12b. By forming the frame body 12 into a plurality of layers in this way, it is possible to increase the size of the storage portion of the defibrated product containing the cellulose fibers. The frame body 12 is not limited to the two-layer structure, and may have a one-layer structure or a three-layer or more structure. The lid 14 may be made of paper such as Japanese paper, corrugated cardboard, paperboard for paper containers, non-woven fabric, or a resin film such as polyethylene, polypropylene, or PET. Since the lid 14 is a resin film, the storage body 11 is provided with a resin film on one side. As a result, the storage body 11 can suppress the flow of gas and further improve the heat insulating performance. The storage body 11 may be provided with a resin film on both main surfaces. The resin film may be attached to the frame body 12 and the plate body 13 with an adhesive or tape.

The storage body 11 (plate body 13, frame body 12 and lid body 14) may be made of paper. As a result, it is possible to reduce the sorting work when disposing of the heat insulating material. In addition, recycling can be promoted to make more effective use of resources.

The term "paper" as used in the present disclosure means that it is produced by adhering plant fibers and other fibers, and includes those that have been surface-treated. Specific examples thereof include corrugated cardboard, paperboard for paper containers including coated balls having a surface coat containing resin, printing paper, and hybrid paper.

FIG. 2 is a perspective view showing a modified example of the heat insulating material of FIG. The heat insulating material 10A of FIG. 2 is composed of a storage body 11A. The heat insulating material 10A is different from the heat insulating material 10 of FIG. 1 in that it does not have a lid. That is, when the lid 14 is attached to the heat insulating material 10A, the heat insulating material 10 in FIG. 1 is obtained. As shown in FIG. 2, the frame body 12 has, for example, a through hole formed by cutting out a central portion of flat paper. This through hole forms a side wall of the storage portion 15 formed in the storage body 11A. The storage portion 15 is divided into two by a band portion 16 that vertically traverses the frame body 12. That is, the heat insulating material 10A has two storage portions 15A and 15B. It is not essential to divide the storage unit 15 into a plurality of units, and the storage unit 15 may be divided into one or three or more.

The defibrated product 20 containing cellulose fibers is stored in the storage portion 15 (15A, 15B). Examples of the defibrated product 20 include those obtained by defibrating paper. The paper used as a raw material may be, for example, used paper such as newspapers, books, magazines, catalogs, woodfree paper, packaging boxes, corrugated cardboard boxes, pulp molds, and paper cushioning materials. As a facility for obtaining the defibrated product 20 from such a raw material, a commercially available dry defibrating device (defibrating machine), a wet defibrating machine, or the like can be appropriately used. In addition, the defibrated product 20 may be obtained using a mill used for cooking at home. In addition to the unraveled cellulose fibers, the defibrated product 20 may contain color materials such as ink and toner adhering to paper powder and used paper, and additives such as an bleeding preventive agent. The defibrated cellulose fibers may be intertwined with each other.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. The two storage portions 15A and 15B composed of the frame body 12, the lid body 14, and the plate body 13 are closed spaces, respectively. Therefore, it is possible to prevent the defibrated product 20 from leaking from the storage portion 15 (15A, 15B) to the outside of the storage body 11. It is not necessary to shut off the gas flow in the closed space, and it is sufficient that the closed space has a degree of airtightness to the extent that solid content does not leak out. The closed space of the storage body 11 is divided into two by the band portion 16 of the frame body 12. Thereby, for example, it is possible to reduce the local bias in the closed space of the defibrated product 20 which may be caused by vibration or the like accompanying transportation. Therefore, the heat insulating material 10 can maintain a sufficiently high heat insulating performance, for example, when it is used for a packaging container to be transported.

The thickness of the housing 11 (11A) may be 1 to 100 mm, 5 to 80 mm, or 10 to 60 mm. The filling density of the defibrated product 20 in the closed space (storage portion 15) formed in the storage body 11 is preferably 0.02 g / cm ³ or more, more preferably 0.05 g, from the viewpoint of improving the heat insulating performance. It is / cm ³ or more, more preferably 0.07 g / cm ³ or more, and particularly preferably 0.08 g / cm ³ or more. The upper limit of the filling density may be, for example, 0.2 g / cm ³ or less, or 0.1 g / cm ³ or less, from the viewpoint of suppressing the swelling of the storage portion.

FIG. 4 is a perspective view of the packing container 100 (packing body 110) according to the embodiment. The packing container 100 has a main body 40 having an accommodating portion for accommodating an object to be packed, and a lid 60 that covers the opening at the upper part of the main body 40 and makes the accommodating portion a closed space. By combining the main body portion 40 and the lid portion 60, the packing container 100 can be obtained. The lid portion 60 has a top plate portion 62 facing the bottom portion of the main body portion 40, and a standing portion 64 that stands on the outer edge of the top plate portion 62 and surrounds the upper portion of the outer surface of the main body portion 40. A package is obtained by accommodating the object to be packed inside the packing container 100.

FIG. 5A is a perspective view showing the lid portion 60 constituting the packing container 100 with the side covering the main body portion 40 facing upward. A heat insulating material 18 is arranged on the back side of the top plate portion of the lid portion 60. The heat insulating material 18 includes, for example, a box-shaped storage body 19 and a defibrated product containing cellulose fibers stored inside (closed space) thereof. The storage body 19 may be made of paper, or may have a laminated layer made of resin on the surface thereof. The defibrated material stored in the storage body 19 may be the same as that stored in the storage bodies 11 and 11A, and may be different. By arranging the heat insulating material 18 on the lid portion 60 in this way, the inflow and outflow of heat from the lid portion 60 can be suppressed. The storage body 19 may have the same structure as the storage body 11 (11A) shown in FIGS. 1 to 3.

FIG. 5B is a perspective view of the box body 42 forming the exterior of the main body 40 shown in FIG. The box body 42 may be made of only paper. Specifically, it is preferably composed of corrugated cardboard and / or paperboard for paper containers. The paperboard for a paper container may be a coated ball having a surface coat containing a resin. The box body 42 and the lid portion 60 preferably have a laminated layer made of resin on at least one of the outer surface and the inner surface. That is, it is preferable to have a laminated structure of paper and a laminated layer. As a result, it is possible to suppress the outflow of cold air from the inside of the box body 42 while being lightweight, and further improve the cold insulation effect. In addition, the strength can be maintained even if moisture due to dew or the like adheres. The laminate layer may be provided by laminating a resin film on paperboard or the like. The resin film to be laminated may be a general-purpose resin film, and examples thereof include polyethylene (high density and low density), polypropylene, and polyethylene terephthalate.

FIG. 6 is a perspective view showing the inside of the packing body 110 with the lid portion 60 removed in the packing body 110 in which the packed object 70 is housed in the packing container 100. FIG. 7 is a cross-sectional view of the main body 40 when the package 110 of FIG. 4 is cut along the line VII-VII. That is, FIG. 7 shows a cross section of the package 110 when it is cut along the horizontal direction. The packing body 110 includes a packing container 100 and an object to be packed 70 housed in a storage portion 72 of the packing container 100. The main body 40 of the packaging container 100 has a box body 42 forming an exterior, a heat insulating material 10, and an inner box 45 in this order from the outside to the inside. The inner box may also be made of paper. Specifically, from the viewpoint of improving the strength and the heat insulating effect, it is preferably composed of corrugated cardboard and / or paperboard for paper containers. The inner box 45 may also have a laminate layer on at least one of the inner surface and the outer surface. Thereby, for example, when the coolant for cooling the packaged object 70 is accommodated in the accommodating portion 72, the cold air can be sealed in the accommodating portion 72.

In the packing container 100, a total of four heat insulating materials 10 are arranged along the inner side surface of the box body 42 so as to face each side surface. The inner box 45 is arranged inside the heat insulating material 10 so that the side surface of the inner box 45 faces the heat insulating material 10. When the lid portion 60 is put on the main body portion 40, the storage body 19 is placed on the inner box 45 while the outer surface of the storage body 19 constituting the heat insulating material 18 provided on the lid portion 60 is in contact with the inner side surface of the inner box 45. Fits on top. As a result, the accommodating portion 72 is shielded from the outside air, and the packaged object 70 can be sufficiently cooled and kept warm.

FIG. 8 is a cross-sectional view of the package 110 of FIG. 4 when cut along the line VIII-VIII. That is, FIG. 8 shows a cross section when the package 110 is cut along the vertical direction. As shown in FIG. 8, the heat insulating material 10 is also arranged at the bottom of the main body 40. That is, the heat insulating material 10 is arranged so as to surround the accommodating portion 72. The accommodating portion 72 is divided into two vertically by a partition plate 75. As the partition board 75, corrugated cardboard or paperboard for paper containers can be used from the viewpoint of effective use of resources. In the modified example, the accommodating portion 72 may be partitioned by the heat insulating material 10 (10A) from the viewpoint of obtaining a higher heat insulating effect.

Six packages 70 are housed in each of the upper storage part 72A and the lower storage part 72B. The gap between the adjacent packed objects 70 and the gap between the packed object 70 and the inner box 45 may be filled with a filler such as paper, and the shape of the packed object 70 is adjusted so that no gap is generated. You may. Further, a coolant for cooling the packaged object 70 may be arranged.

Examples of the packaged item 70 include frozen foods and frozen desserts. When such a packaged object 70 is accommodated, the accommodating portion 72 may accommodate a coolant for cooling the packaged object 70. Examples of the coolant include ice and dry ice.

In the modified example, the packing body may include a bag made of resin (for example, made of high-density polyethylene) for packaging (accommodating) the packing container 100. As a result, the flow of gas can be blocked, and the cold insulation effect or the heat insulation effect can be further enhanced. Further, the resin film may be arranged along the inner surface of the inner box 45, or the resin film is sandwiched between the heat insulating material 10 and the inner box 45 and / or between the heat insulating material 10 and the box body 42. But it may be. The resin film may be a general-purpose resin film, and examples thereof include polyethylene (high density and low density), polypropylene, and polyethylene terephthalate. By providing such a resin film for sealing, cold air can be sealed in the accommodating portion 72, and the heat insulating performance can be further improved. From the viewpoint of improving the heat insulating performance, the thickness of the sealing resin film is preferably 5 μm or more, more preferably 9 μm or more. From the viewpoint of improving handleability, the thickness of the sealing resin film may be 50 μm or less, and may be 30 μm or less.

The packaged object 70 is not limited to frozen foods and frozen desserts, and may be a heated food or beverage. The packing container 100 may be entirely made of paper. The paper in this case may be provided with a laminate layer made of resin on the surface. In addition to being lightweight, such packaging is easy to recycle and recycle after use. Therefore, recycling can be promoted and resources can be used more effectively.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. For example, the heat insulating materials 10, 10A, and 18 are composed of the housing bodies 11, 11A, and 19 having a rectangular parallelepiped shape, but the heat insulating materials 10, 10A, and 18 are not limited to such a shape. For example, it may be composed of a storage body having chamfered corners, or may be composed of a cylindrical storage body. Further, the storage body may be, for example, a paper bag or a resin bag. The heat insulating material does not have to be provided on all of the upper surface, lower surface (bottom surface), and side surface of the packaging container and the packaging body, and may be provided on only a part of the surfaces. Further, a plurality of heat insulating materials may be laminated to obtain a larger heat insulating effect. The packing container 100 and the packing body 110 have a square pillar shape, but are not limited to such a shape, and may be, for example, a cylindrical shape. The packing container may be formed by combining corrugated cardboard and paperboard for paper containers. The accommodating portion in the packing container may not be divided into two, and may be divided into three or more.

The contents of the present disclosure will be described in more detail with reference to Examples and Comparative Examples, but the present disclosure is not limited to the following examples.

(Example 1)
<Making the storage body>
Corrugated cardboard, which is generally distributed, was defibrated using a household mixer to obtain a defibrated product containing cellulose fibers. FIG. 9 is a photograph of the obtained defibrated product. Further, another corrugated cardboard (thickness: about 5 mm) that is generally distributed was cut into a predetermined size and processed to produce a frame body 12 and a plate body 13 as shown in FIG. A frame body 12 formed by stacking two or four pieces of corrugated cardboard was laminated on a plate body 13 made of one piece of corrugated cardboard. Then, the storage portion 15 was filled with the defibrated product of FIG. In this way, a storage body as shown in FIGS. 2 and 3 was produced. Then, the lid body 14 was attached to the upper surface of the frame body 12 to prepare a storage body as shown in FIG.

FIG. 10 is a photograph showing an example of the produced storage body. The storage body on the right side of FIG. 10 is formed by laminating a resin film on the frame body 12 as a lid body 14 to form a closed space. The storage body on the left side of FIG. 10 is made by laminating Western paper as a lid body 14 on the frame body 12 to form a closed space. Five storage bodies as shown on the left side of FIG. 10 were produced, and these were used for producing the following packaging containers.

The thickness of the storage body arranged on the side wall and the bottom of the main body of the packing container, the thickness of the closed space (storage part), the mass of the filled defibrated material, and the filling of the defibrated material in the closed space (storage part). The density (mass of defibrated product / volume of closed space) was as shown in Table 1.

<Manufacturing of packing container and packing body>
A polypropylene film (thickness 20 μm) was laminated on a commercially available coated ball (310 g / m ^{2) to obtain an exterior material.} This exterior material was cut into a predetermined shape to produce a lid portion 60 as shown in FIG. 5 (A) and a box body 42 as shown in FIG. 5 (B). The heat insulating material 18 in the lid 60 was made by using a box made of corrugated cardboard as a storage body (heat insulating material) and filling it with the above-mentioned defibrated product. Thickness of storage body in lid 60, thickness of closed space (storage part), mass of filled defibrated material, filling density of defibrated material in closed space (storage part) (mass of defibrated product / volume of closed space) ) Are as shown in Table 1.

The storage body prepared as described above was arranged as a heat insulating material on the bottom surface of the box body 42 and inside the four side surfaces. Since the size of the side wall of the box body 42 was adjusted in advance so as to be higher than the height of the heat insulating material, after arranging the heat insulating material, the upper end of the side wall was folded inside to form the upper end portion and the inside of the heat insulating material 10. The upper end of the side wall was folded inward so as to cover the upper part of the side surface, and fixed with an adhesive. Then, an inner box made of a commercially available coated ball was housed inside the box body 42. In this way, the main body of the storage container was produced. Then, a high-density polyethylene film (thickness: 12 μm) was placed in the inner box as an interior material. A high-density polyethylene film (thickness: 12 μm) was also attached to the inside of the lid as an interior material with an adhesive.

FIG. 11 (A) is a photograph when a high-density polyethylene film is placed on the inner surface of the main body of the prepared packaging container, and FIG. 11 (B) is a photograph showing the inside of the prepared lid. is there. As shown in FIG. 12 (A), the ice cream contained in the container is divided into an upper stage and a lower stage in the storage portion of the main body of the packaging container produced in this manner, and four ice creams are placed in each stage (a total of eight ice creams). Contained. One of the four ice cream containers in each stage was selected, and the sensor of the thermometer (TR-71nw manufactured by T & D, trade name) was fixed inside the selected ice cream container. After placing 1 kg of dry ice on the upper ice cream container as shown in FIG. 12 (A), the lid portion was put on the main body portion and the accommodating portion was sealed to obtain a package. The prepared package was packaged in a high-density polyethylene bag (thickness: 30 μm) as shown in FIG. 12 (B), and the heat insulating performance was evaluated.

<Evaluation of heat insulation performance>
After sealing, the change over time in the temperature inside the upper and lower ice cream containers housed in the container was measured. The outside air temperature was adjusted to be constant at 16 ° C. The measurement was continued for 24 hours.

FIG. 13 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. Immediately after the start of the measurement, the temperature decreased due to the cooling effect of dry ice, and reached the minimum temperature after 7 to 11 hours had passed. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1.

(Example 2)
As the interior material, the storage body, the packing container and the packing container and the packaging container and the same as in Example 1 except that the high-density polyethylene film (thickness: 12 μm) was used instead of the high-density polyethylene film (thickness: 8 μm). A package was prepared and the heat insulation performance was evaluated. The thickness of the storage body placed on the side wall, bottom, and lid of the main body of the packing container, the thickness of the closed space (storage part), the mass of the filled defibrated product, and the defibrated product in the closed space (storage part). The packing density (mass of defibrated product / volume of closed space) was as shown in Table 1.

FIG. 14 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. Immediately after the start of the measurement, the temperature decreased due to the cooling effect of dry ice, and reached the minimum temperature after 6 to 9 hours had passed. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. Although the minimum temperature and the temperature after one day were higher than those of the packing container of Example 1, the packing container of Example 2 also had sufficient heat insulating performance.

(Example 3)
A storage body, a packing container, and a packing body were prepared in the same manner as in Example 1 except that a high-density polyethylene film (thickness: 12 μm) was not used as the interior material, and the heat insulating performance was evaluated. FIG. 15 is a photograph of ice cream contained in a container divided into upper and lower tiers, four of which are stored in each tier (a total of eight), and dry ice is placed on the tier. The thickness of the storage body placed on the side wall, bottom, and lid of the main body of the packing container, the thickness of the closed space (storage part), the mass of the filled defibrated product, and the defibrated product in the closed space (storage part). The packing density (mass of defibrated product / volume of closed space) was as shown in Table 1.

FIG. 16 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. Immediately after the start of the measurement, the temperature decreased due to the cooling effect of dry ice, and reached the minimum temperature after 5 to 7 hours had passed. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. Although the temperature after one day was higher than that of the packaging container of Example 1, the packaging container of Example 3 also had sufficient heat insulating performance. The amount of dry ice remaining after the lapse of one day was less than that in Example 1. It is considered that this is because the HDPE film was not provided as the interior material in Example 3, and thus the sealing property of _{the cold air (CO 2 gas) was lowered.}

(Example 4)
The storage body, the packing container, and the packing body were prepared in the same manner as in Example 1 except that the sizes of the storage bodies arranged on the side wall portion, the bottom portion, and the lid portion of the packing container were changed as shown in Table 1. The heat insulation performance was evaluated. The thickness of the storage body placed on the side wall, bottom, and lid of the main body of the packing container, the thickness of the closed space (storage part), the mass of the filled defibrated product, and the defibrated product in the closed space (storage part). The packing density (mass of defibrated product / volume of closed space) was as shown in Table 1.

FIG. 17 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. Immediately after the start of the measurement, the temperature decreased due to the cooling effect of dry ice, and reached the minimum temperature after 6 to 7 hours had passed. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. Since the amount of defibrated material stored in the storage body used as the heat insulating material was smaller than that in Example 1, the minimum temperature and the temperature after one day had passed were higher than those in the packaging container of Example 1. However, the packaging container of Example 4 also had sufficient heat insulating performance.

(Comparative Example 1)
A packaging container made of Styrofoam as shown in FIG. 18 (A) was prepared. The thicknesses of the side wall, bottom and lid of the packaging container are as shown in Table 1. The ice cream contained in the container was contained in this foam and packed as shown in the photograph of FIG. 18 (B), and the heat insulating performance was evaluated in the same manner as in Example 1.

FIG. 19 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. It was confirmed that the heat insulating performance was lower than that of Example 4, in which the thicknesses of the side wall portion and the lid portion of the packaging container were almost the same.

(Comparative Example 2)
Two cardboard boxes of different sizes (A flute, thickness: 5 mm) were prepared. As shown in FIG. 20 (A), the inner box was housed in the outer box with one as the outer box and the other as the inner box. As shown in FIG. 20 (B), the ice cream contained in the container is divided into upper and lower tiers in the inner box, and 4 pieces (8 pieces in total) are stored in each tier, and dry ice is placed on the tier. It was placed. One of the four ice cream containers in each stage was selected, and the thermometer sensor was fixed inside the selected ice cream container. Then, the inner box and the outer box were sealed with a gum tape to prepare a package. Then, the heat insulating performance was evaluated in the same manner as in Example 1.

FIG. 21 is a graph showing the measurement results. The lower curve shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. It was confirmed that the temperature of the packaged items tended to rise with the passage of time. It is probable that all the dry ice had sublimated after 15 hours. From these results, it was confirmed that the heat insulation performance was clearly low.

(Comparative Example 3)
One cardboard (A flute, thickness: 5 mm) was sandwiched between the inner box and the outer box (only the side wall and bottom) used in Comparative Example 2, and the packaged material and dry ice were densely packed. A package was prepared in the same manner as in Comparative Example 2 except that it was placed in a polyethylene bag (thickness: 12 μm) and placed in an inner box, and the heat insulating performance was evaluated.

FIG. 22 is a graph showing the measurement results. The lower curve after 1 to 18 hours shows the temperature inside the upper ice cream container, and the upper curve shows the temperature inside the lower ice cream container. The minimum temperatures in the upper ice cream container and the lower ice cream container, and the temperatures after one day (24 hours) have elapsed are as shown in Table 1. In Comparative Example 3, it was confirmed that the temperature of the packaged object tended to rise with the passage of time. Dry ice remained even after one day had passed. It is considered that this is because the sealing property was improved by using the bag made of high-density polyethylene. However, the heat insulation performance was low.

10, 10A, 18 ... Insulation material, 11, 11A ... Storage body, 12 ... Frame body, 12a ... First frame body, 12b ... Second frame body, 13 ... Plate body, 14 ... Lid body, 15, 15A, 15B ... storage part, 16 ... band part, 18 ... heat insulating material, 19 ... storage body, 20 ... defibrated material, 40 ... main body part, 42 ... box body, 45 ... inner box, 60 ... lid part, 62 ... top plate part , 64 ... Standing part, 70 ... Packaged object, 72, 72A, 72B ... Storage part, 75 ... Section plate, 100 ... Packing container, 110 ... Packing body.

Claims (10)

A heat insulating material placed in a packaging container containing frozen foods or frozen desserts.
Includes a housing body defibrated material containing cellulose fibers is accommodated,
The defibrated product is stored in a closed space formed in the storage body.
A heat insulating material having a packing density of the defibrated product in the closed space of 0.05 g / cm ^{3 or more.} The heat insulating material according to claim 1, wherein the defibrated product is obtained by defibrating used paper. The heat insulating material according to claim 1 or 2, wherein the packing density of the defibrated product in the closed space is 0.07 to 0.2 g / cm ^3. The heat insulating material according to any one of claims 1 to 3, wherein the closed space is divided into a plurality of sections. The heat insulating material according to any one of claims 1 to 4 , wherein the storage body is made of paper. The heat insulating material according to any one of claims 1 to 5 , wherein the housing body includes a resin film on at least one surface. A packaging container including a storage unit for accommodating an object to be packed and the heat insulating material according to any one of claims 1 to 6. The packaging container according to claim 7 , wherein the heat insulating material is provided between the accommodating portion and the box body forming the exterior. The packaging container according to claim 8 , wherein the box body includes a laminated layer made of resin. The packing container according to any one of claims 7 to 9, the packed object housed in the accommodating portion, a coolant for cooling the packed object, and a resin for sealing the cold air of the coolant. With film ,
The packaged object is a packaged body which is the frozen food or the frozen dessert.

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