JP5193005B2 - Assembled cushioning insulation - Google Patents

Description

  The present invention relates to a prefabricated cushioning heat insulating material that is detachably mounted inside a hexahedral courier container made of plastic or plastic corrugated cardboard.

There is a refrigerated container for home delivery formed from a plurality of foam sheets made mainly of waste paper powder and a hexahedral cardboard box made of cardboard (see Patent Document 1). In the cooler for home delivery, these foam sheets are disposed inside the cardboard box, and each foam sheet is bonded to the inner surface of the top wall and each side wall of the cardboard box with an adhesive. The foam sheet is made by kneading 60% by weight of waste paper powder and 40% by weight of polypropylene under heating to form a high-temperature mixture, adding water to the high-temperature mixture, and using the vaporization of water to convert the high-temperature mixture to a predetermined magnification. Made from foaming.
JP 2003-63570 A

  The refrigerated container for courier disclosed in Patent Document 1 must dispose of the foam sheet together with the cardboard box as the cardboard box is consumed. The foam sheet is separated from the cardboard box and reused. I can't do it. In addition, since the folding box of the corrugated cardboard box is prevented from being folded by the foam sheet, the cooler container for home delivery cannot be folded and stored in the unused state. Furthermore, since the cold storage container retains the hexahedron shape in the unused state and is bulky, it takes space for the arrangement of the cold storage container in the unused state, and depending on the space of the loading platform of the courier vehicle, it is unused in the loading platform. It may not be possible to load more than one cold storage container.

  An object of the present invention is to provide a prefabricated buffer heat insulating material that can be used repeatedly and does not become bulky when folded when not in use.

  The premise of the present invention for solving the above-mentioned problem is an assembly type buffer heat insulating material that is detachably mounted inside a hexahedral courier container made of plastic or plastic cardboard in a state of being assembled into a hexahedron. .

  The feature of the present invention in the above premise is that the assembly-type cushioning heat insulating material is parallel to the first foam plate material extending in the first direction formed by joining a plurality of rod-shaped foams parallel to the same direction in the same direction. A plurality of stick-shaped foams formed by joining and formed from a pair of second foamed plate members extending in a second direction intersecting the first direction, and the first foamed plate member is formed of a hexahedron and a bottom wall A first side wall that is foldably connected to both side edges in the first direction of the bottom wall, and a top wall that is foldably connected to at least one first direction side edge of the first side walls; 2 foam plate material forms a second side wall of the hexahedron that is foldably connected to both side edges of the bottom wall in the second direction, and the second side wall is the bottom wall when the assembled cushioning insulation is not used. Folded inward in the second direction so that it overlaps the It is folded inward in the first direction together with the top wall connected to the first side walls so as to overlap the both side walls, and the connection points between the bottom wall and the first side walls are overlapped with each other. A folding allowance having substantially the same dimension as the thickness dimension is formed, and the assembled buffer heat insulating material is folded in substantially the same shape as the planar shape of the bottom wall when not used.

  As an example of the present invention, the rod-like foams forming the first foamed plate material are arranged in the first direction on the top bottom wall and the first side walls, and the second foamed plate material is formed on the second side walls. The rod-shaped foams are juxtaposed in the second direction.

  As another example of the present invention, a reinforcing tape is attached to the bent portion of the walls.

  As another example of the present invention, a mixture obtained by kneading and molding plant fiber powder and starch powder in which the first and second foamed plate materials are finely pulverized to 20 to 200 μm through water, and a polyolefin-based thermoplastic synthetic resin The total weight of the mixture is made by adding water to the high-temperature melt obtained by mixing the mixture and synthetic resin under heating, and foaming the melt to a predetermined magnification by vaporizing water in the high-temperature melt. The weight ratio of the paper powder to the weight is in the range of 20 to 55% by weight, and the weight ratio of the starch powder to the total weight of the mixture is in the range of 40 to 75% by weight.

  As another example of the present invention, the weight ratio of the mixture to the total weight of the high temperature melt is in the range of 60 to 80% by weight, and the weight ratio of the thermoplastic synthetic resin to the total weight of the high temperature melt is 20 to 40% by weight. % Range.

  As another example of the present invention, the mixture contains 2 to 5% by weight of shell calcined calcium powder finely pulverized to 10 to 50 μm.

  As another example of the present invention, the mixture includes 2 to 5% by weight of charcoal powder finely pulverized to 10 to 50 μm.

  As another example of the present invention, a polyolefin-based thermoplastic synthetic resin film is bonded to at least the upper surface of the upper and lower surfaces of the first and second foamed plate members.

  According to the assembly-type cushioning heat insulating material according to the present invention, the first foamed plate material forms the top bottom wall and the first both side walls, the second foamed plate material forms the second both side walls, and is assembled into a hexahedron. Because it is used by being mounted inside a hexahedral courier container made of plastic or plastic corrugated cardboard, it exhibits a buffering function for each inner wall of the courier container with low buffering properties and has heat insulation properties Insulates low courier containers and prevents deformation and damage caused by collisions with the inner wall of the package stored inside the courier container. It is possible to keep warm. The assembled shock-absorbing heat insulating material is folded inward in the second direction so that the second side walls overlap the bottom wall when not in use, and the first side walls overlap the second side walls. 1 Folded inward in the first direction along with the top wall connected to both side walls, and the thickness dimension when the walls are overlapped is absorbed in the folding allowance. It is possible to fold it into a flat shape without being bulky when not in use, and after the delivery is finished, take out the buffer insulation from the courier container and store it in a folded state without taking up space. Can do. This assembled buffer heat insulating material can be reassembled and used at the time of home delivery, and can be reused multiple times.

  The rod-shaped foams forming the first foamed plate material in the top bottom wall and the first side walls are arranged in parallel in the first direction, and the rod-shaped foams forming the second foamed plate material in the second side walls in the second direction. Since the assembly type shock-absorbing heat insulating materials arranged in parallel are in the top direction wall and the first both side walls, the extending direction of the rod-like foams is the first direction, so that the first both side walls and the top wall are swung in the first direction. Even if a bending force inward or outward in the first direction acts on these walls, the resistance force of these rod-like foams to the bending force is strong, and the top wall and the first side walls are not bent. In this part, it is not inadvertently bent, and breakage of parts other than the bent part can be prevented. In this assembled cushioning heat insulating material, since the extending direction of the rod-like foams is the second direction on the second side walls, when the second side walls are swung in the second direction, Or even if an outward bending force is applied, the resistance of the rod-like foam to the bending force is strong, and the second side walls are not inadvertently bent at portions other than the bent portion. Breakage of other parts can be prevented.

  Since the assembly type shock-absorbing insulating material in which the reinforcing tape is attached to the folding portion between the walls is prevented from being separated at the bending portion of the wall by the reinforcing tape, the durability of the buffer insulating material is improved, and the assembly and folding are performed. Even if the above is repeated a plurality of times, the walls are not broken at each bent portion, and the number of repeated reuses of the buffer heat insulating material can be increased.

  Water is added to the high-temperature melt in which the first and second foamed plate materials are a mixture of plant fiber powder and starch powder kneaded and molded through water and a polyolefin-based thermoplastic synthetic resin, and the mixture is heated. The assembly-type buffer heat insulating material made from foaming the melt at a predetermined magnification by vaporizing water forms a large number of closed cells inside the first and second foamed plate materials, and these foamed plate materials have excellent buffering properties. Therefore, a buffering function is exerted on each inner wall of the courier container, and damage caused by a collision of the luggage stored inside the courier container with the container inner wall can be reliably prevented. Assembling-type shock-absorbing insulation materials have excellent heat insulation properties, and these foamed plate materials have a heat insulation function for courier containers with low heat insulation properties, and the luggage stored inside the courier containers is a food product. In this case, it is possible to keep it cold or warm. This assembled cushioning insulation is made from plant fiber powder, starch powder and polyolefin-based thermoplastic synthetic resin, so it does not contain environmental hormone substances and does not generate gas components such as formaldehyde. Even if it is used as a buffer heat insulating material for containers, the luggage stored in the courier container is not contaminated by environmental hormone substances or gas components.

  The assembling-type buffer heat insulating material in which the weight ratio of the thermoplastic synthetic resin to the total weight of the high-temperature melt is in the range of 20 to 40% by weight is a mixture in which the proportion of the thermoplastic synthetic resin is kneaded and molded from plant fiber powder and starch powder. Therefore, the combustion calories in the buffer heat insulating material can be lowered, and the buffer heat insulating material can be incinerated at a low incineration temperature. This assembled buffer heat insulating material does not generate smoke during the incineration process, and does not adversely affect the environment.

  The assembling-type buffer heat insulating material containing 2 to 5% by weight of the shell-fired calcium powder finely pulverized to 10 to 50 μm includes the shell-fired calcium powder having an excellent bactericidal action. Occurrence and propagation of various bacteria can be prevented, and the hygienic state of the buffer heat insulating material can be maintained. This assembled buffer heat insulating material can prevent bacteria and mold from adhering to the luggage stored in the courier container.

  The assembling-type buffer heat insulating material containing 2-5% by weight of charcoal powder finely pulverized to 10-50 μm contains charcoal powder having excellent deodorizing action, so that the odor in the courier container can be reduced. It can be removed, and an unpleasant odor can be prevented from adhering to the luggage accommodated inside the courier container.

  The assembling-type buffer heat insulating material in which a polyolefin-based thermoplastic synthetic resin film is bonded to at least the upper surface of the first and second foamed plate materials has a function of reinforcing the surface of the foamed plate material, Since inadvertent breakage of the foamed plate material is prevented, the durability of the buffer heat insulating material is improved, and the number of repeated reuses of the buffer heat insulating material can be increased. Since the assembly-type buffer heat insulating material prevents moisture from entering into the buffer heat insulating material by the synthetic resin film, the buffer heat insulating material can be prevented from becoming weak due to water entering the buffer heat insulating material. This assembled buffer heat insulating material is improved in heat insulation by the synthetic resin film, and exhibits a further excellent heat insulating function for a courier container having low heat insulation.

  The details of the assembly-type shock-absorbing heat insulating material according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a developed view of an assembled buffer heat insulating material 10A shown as an example, and FIG. 2 is a side view of the buffer heat insulating material 10A shown in a folded state. FIG. 3 is a partially enlarged view of the foamed plate materials 17 and 18, and FIG. 4 is a diagram for explaining the mounting of the assembled buffer heat insulating material 10 </ b> A to the courier container 42. 5 is an end view taken along line 5-5 of FIG. 4, and FIG. 6 is an end view taken along line 6-6 of FIG. In addition, illustration of the film 22 is abbreviate | omitted in drawings other than FIG. 1 and 2, the first direction is indicated by an arrow A, the second direction intersecting the first direction is indicated by an arrow B (only in FIG. 1), and the thickness direction is indicated by an arrow C (only in FIG. 2).

  The assembled buffer heat insulating material 10 </ b> A is a first wall formed of a bottom wall 11, front and rear side walls 12, 13 (first side walls), left and right side walls 14, 15 (second side walls), and a top wall 16 when used. It is assembled into a rectangular parallelepiped (hexahedron) box shape that is long in the direction, and is detachably mounted inside a rectangular parallelepiped (hexahedron) courier container 42 described later. The assembly-type buffer heat insulating material 10A has a plate-like first foamed plate member 17 having a predetermined thickness dimension and extending in the first direction, and a plate-like second foaming member having a predetermined thickness dimension and extending in the second direction. It is formed from the plate material 18. Although there is no limitation in particular in the thickness dimension of these foam board materials 17 and 18, it is preferable to exist in the range of 5-35 mm.

  As shown in FIG. 3, the first and second foamed plate members 17 and 18 are made by joining a plurality of rod-shaped foams 19 extending in parallel in the same direction. A large number of independent bubbles (not shown) are formed inside the rod-shaped foams 19. Bubbles are not uniform in shape and size, and extend discontinuously and irregularly in all directions. These rod-shaped foams 19 have a closed cell ratio of 40% or more and an average cell diameter of 2.0 mm or less. The closed cell ratio is preferably 50% or more, and the average cell diameter is preferably 1.5 mm or less.

  The first foamed plate member 17 forms the bottom wall 11, the front and rear side walls 12, 13, and the top wall 16 among the walls 11 to 16 that define a rectangular parallelepiped. In these walls 11, 12, 13, and 16, the rod-like foams 29 forming the first foamed plate material 17 extend in parallel in the first direction. As shown in FIG. 3, a polyolefin-based thermoplastic synthetic resin film 22 is bonded to the upper and lower surfaces 20 and 21 of the first foamed plate material 17. Although there is no limitation in particular in the thickness dimension of the film 22, it is preferable that it exists in the range of 0.2-2.0 mm, More preferably, it is 0.3-1.0 mm. The film 22 may be bonded to one of the upper and lower surfaces 20 and 21 of the first foamed plate material 17, and the film 22 may not be bonded to the foamed plate material 17. As the polyolefin-based thermoplastic synthetic resin film 22, any one of a polyethylene film, a polypropylene film, a polystyrene film, a polyvinyl chloride film, and a polyvinyl alcohol film can be used.

  The bottom wall 11 is formed into a rectangle whose planar shape is long in the first direction. The front side wall 12 is formed into a rectangle whose planar shape is long in the second direction, and is connected to one of the side edges 23 in the first direction of the bottom wall 11. Between the bottom wall 11 and the front side wall 12, the 1st bending line 24 (cutting line toward the upper surface 20 from the lower surface 21 of the board | plate material 17) extended in a 2nd direction is formed. The first fold line 24 becomes the first direction side edge 23. A second fold line 25 (a cut line from the lower surface 21 to the upper surface 20 of the plate material 17) extending in the second direction is formed on the front side wall 12, and a third fold line 26 (the plate material 17 A cut line from the upper surface 20 toward the lower surface 21 is formed. The front side wall 12 can be bent via the fold lines 24, 25, and 26, and can be turned in the first direction by the fold lines 24, 25, and 26.

  A folding margin 27 is formed between the first folding line 24 and the second folding line 25. The dimension in the first direction of the folding allowance 27 is substantially the same as the thickness dimension of the left side wall 14 or the right side wall 15 that overlap when the assembled buffer heat insulating material 10A is folded. Adhesive tape extending in the second direction covering the folding lines 24 and 25 is provided at a connecting portion (the upper surface 20 of the plate member 17) between the bottom wall 11 and the front side wall 12 with the first and second folding lines 24 and 25 as the center. 28 is fixed. The adhesive tape 28 is made of a plastic film having an adhesive material coated on one side. An adhesive tape 29 extending in the second direction covering the third folding line 26 is fixed to the central portion of the front wall 12 (the lower surface 21 of the plate member 17).

  The rear side wall 13 is shaped into a rectangle whose planar shape is long in the second direction, and is connected to the other side edge 23 of the bottom wall 11 in the first direction. Between the bottom wall 11 and the rear side wall 13, the 4th bending line 29 (cutting line toward the upper surface 20 from the lower surface 21 of the board | plate material 17) extended in a 2nd direction is formed. The fourth fold line 29 becomes the first direction side edge 23. A fifth fold line 39 (a cut line from the lower surface 21 of the plate member 17 toward the upper surface 20) extending in the second direction is formed on the rear side wall 13, and a sixth fold line 31 (of the plate member 17) is formed at a substantially central portion thereof. A cut line from the upper surface 20 toward the lower surface 21 is formed. The rear side wall 13 can be bent via the folding lines 29, 30, and 31, and can be turned in the first direction by the folding lines 29, 30, and 31.

  A folding margin 32 is formed between the fourth folding line 29 and the fifth folding line 30. The dimension of the folding margin 32 in the first direction is substantially the same as the thickness dimension of the left side wall 14 or the right side wall 15 that overlap when the assembled buffer heat insulating material 10A is folded. Adhesive tape extending in the second direction covering the folding lines 29 and 30 is provided at the connecting portion (the upper surface 20 of the plate member 17) of the bottom wall 11 and the rear side wall 13 with the fourth and fifth folding lines 29 and 30 as the center. 28 is fixed. An adhesive tape 28 extending in the second direction covering the sixth fold line 31 is fixed to the central portion of the rear wall 13 (the lower surface 21 of the plate member 17).

  The top wall 16 is formed in a rectangular shape whose planar shape is long in the first direction, and is connected to the first direction side edge 33 of the front side wall 12. Between the front wall 12 and the top wall 16, a seventh fold line 34 (a cut line from the lower surface 21 to the upper surface 20 of the plate member 17) extending in the second direction is formed. The seventh fold line 34 becomes the first direction side edge 33. The top wall 16 can be bent via a seventh fold line 34, and can be turned in the first direction by the fold line 34. An adhesive tape 28 formed of a plastic film extending in the second direction is fixed to a connecting portion (the upper surface 20 of the plate member 17) between the front side wall 12 and the top wall 16 around the seventh fold line 34.

  The second foamed plate material 18 forms left and right side walls 14 and 15 among the walls 11 to 16 that define a rectangular parallelepiped. In the left and right side walls 14 and 15, the rod-like foams 19 forming the second foamed plate material 18 extend in parallel in the second direction. A polyolefin-based thermoplastic synthetic resin film 22 is joined to the upper and lower surfaces 35 and 36 of the second foamed plate material 17. The film 22 may be bonded to one of the upper and lower surfaces 35 and 36 of the second foamed plate material 18, and the film 22 may not be bonded to the foamed plate material 18.

  The left side wall 14 is shaped into a rectangle whose planar shape is long in the first direction, and is connected to one of both side edges 37 in the second direction of the bottom wall 11. Between the bottom wall 11 and the left side wall 14, an eighth fold line 38 (a cut line from the lower surface 21 to the upper surface 20 of the plate member 18) extending in the first direction is formed. The eighth fold line 38 becomes the second direction side edge 37. A ninth fold line 39 (a cut line from the upper surface 20 to the lower surface 21 of the plate member 18) extending in the first direction is formed at a substantially central portion of the left side wall 14. The left side wall 14 can be bent via the eighth and ninth fold lines 38 and 39, and can be turned in the second direction by the fold lines 38 and 39. An adhesive tape 28 extending in the second direction covering the eighth fold line 38 is fixed to a connecting portion (the upper surface 35 of the plate member 18) between the bottom wall 11 and the left side wall 14 around the eighth fold line 38. . An adhesive tape 28 extending in the second direction covering the ninth fold line 39 is fixed to the central portion of the left side wall 14 (the lower surface 36 of the plate member 18).

  The right side wall 15 is formed in a rectangular shape whose plan shape is long in the first direction, and is connected to the other side edge 37 in the second direction of the bottom wall 11. Between the bottom wall 11 and the right side wall 15, a tenth fold line 40 (a cut line from the lower surface 36 to the upper surface 35 of the plate member 18) extending in the first direction is formed. Note that the tenth fold line 40 becomes the second direction side edge 37. An eleventh fold line 41 (a cut line from the upper surface 35 to the lower surface 36 of the plate member 18) extending in the first direction is formed at a substantially central portion of the right wall 15. The right side wall 15 can be bent via the tenth and eleventh fold lines 40 and 41, and can be turned in the second direction by the fold lines 40 and 41. An adhesive tape 28 extending in the second direction covering the tenth fold line 40 is fixed to a connecting portion (the upper surface 35 of the plate member 18) between the bottom wall 11 and the right side wall 15 around the tenth fold line 40. . An adhesive tape 28 extending in the second direction covering the eleventh fold line 41 is fixed to the central portion of the right side wall 15 (the lower surface 36 of the plate member 18).

  A procedure for folding the assembled buffer heat insulating material 10A from the developed state of FIG. 1 to the state of FIG. 2 will be described as follows. The left side wall 14 is pivoted inward in the second direction via the eighth and ninth fold lines 38 and 39, the left side wall 14 is folded at the fold lines 38 and 39, and the left side wall 14 is overlaid on the bottom wall 11. Match. The left side wall 14 is folded into two layers by a ninth fold line 39. The right side wall 15 is pivoted inward in the second direction via the tenth and eleventh fold lines 40, 41, the right side wall 15 is folded at the fold lines 40, 41, and the right side wall 15 is overlaid on the bottom wall 11. Match. The right side wall 15 is folded in two by an eleventh fold line 41.

  The rear side wall 13 is pivoted inward in the first direction via the fourth to sixth fold lines 29, 30, 31, the rear side wall 13 is folded by the fold lines 29, 30, 31, and the rear side wall 13 is left and right side walls 14. , 15. The rear side wall 13 is folded in two layers by a sixth fold line 31. Since the thickness of the overlapping left side wall 14 or right side wall 15 is absorbed by the folding margin 32 between the fourth fold line 29 and the fifth fold line 30, the left and right side walls 14, 15 and the rear side wall 13 are substantially parallel. overlap.

  Next, the front side wall 12 and the top wall 16 are turned inward in the first direction via the first to third fold lines 24, 25, 26 and the seventh fold line 34, and the walls 12, 16 are bent. Folded by lines 24, 25, 26, 34, the front side wall 12 is superimposed on the left and right side walls 14, 15, and the top wall 16 is superimposed on the front and rear walls 12, 13. The front side wall 12 is folded into two layers by a third fold line 26. Since the thickness of the overlapping left side wall 14 or right side wall 15 is absorbed by the folding margin 27 between the first fold line 24 and the second fold line 25, the left and right side walls 14, 15 and the front side wall 12 are substantially parallel. overlap. As shown in FIG. 2, the assembled buffer heat insulating material 10 </ b> A is folded into a substantially flat shape substantially the same shape as the planar shape of the bottom wall 11.

  The assembly procedure of the assembly-type buffer heat insulating material 10A and the mounting to the courier container 42 will be described with reference to FIG. In addition, although the assembly-type orange box type | mold made from plastic or a plastic corrugated cardboard is illustrated as the container 42 for courier service, the container 42 is not limited to an orange box type. As the courier container 42, it is also possible to use an assembled type such as an assembled bottom type or a folding container type made of plastic or plastic cardboard, and a main body / lid type or molded type made of plastic or plastic cardboard. A non-assembled type such as a container type can also be used. These courier containers 42 are made of plastic or plastic corrugated cardboard, so that they are strong and excellent in durability, but their buffering performance is lower than that of a courier box made of corrugated cardboard. Therefore, the luggage stored in the container 42 may collide with the inner wall of the container 42 to be deformed or damaged. Further, these courier containers 42 have low heat insulation properties, and when the luggage stored in the container 42 is food, it is unsuitable for keeping it cold or warm.

  The front side wall 12 is turned inward in the first direction via the first fold line 24, the front side wall 12 is bent at a substantially right angle with respect to the bottom wall 11, and the rear side wall 13 is first changed via the fourth fold line 29. The rear side wall 13 is bent at a substantially right angle with respect to the bottom wall 11. The left side wall 14 is turned inward in the second direction via the eighth fold line 38, the left side wall 14 is bent at a substantially right angle with respect to the bottom wall 11, and the right side wall 15 is bent through the tenth fold line 40. The right side wall 15 is bent at a substantially right angle with respect to the bottom wall 11. Next, the top wall 16 is turned in the first direction via the seventh fold line 34, and the top wall 16 is bent at a substantially right angle with respect to the front and rear side walls 12 and 13.

  When these walls 11 to 16 are bent through the folding lines 24, 29, 34, 38, and 40, a rectangular parallelepiped (box-shaped) buffer heat insulating material 10A is assembled in the first direction, and the buffer heat insulating material 10A is delivered to the home. It is mounted inside the stool container 42. The size of the assembled buffer heat insulating material 10A is slightly smaller than that of the courier container 42, and the buffer heat insulating material 10A can be mounted inside the courier container 42 as shown in FIG. .

  When the assembled buffer heat insulating material 10A is attached to the inside of the courier container 42, the bottom wall 11 contacts the inner surface of the bottom wall of the container 42, and the front and rear side walls 12 and 13 contact the inner surfaces of the front and rear side walls of the container 42. At the same time, the left and right side walls 14 and 15 come into contact with the inner surfaces of the left and right side walls of the container 42. In this state, the luggage is stored inside the buffer heat insulating material 10A, and the top wall of the courier container 42 is closed. When the top wall of the container 42 is closed, the top wall 16 contacts the inner surface of the top wall of the container 42. After the delivery is completed, the buffer heat insulating material 10A is taken out from the inside of the courier container 42, and the buffer heat insulating material 10A is folded by the above procedure.

  Since the assembled buffer heat insulating material 10A is used by being mounted inside a hexahedral courier container 42 made of plastic or plastic corrugated cardboard in a state of being assembled into a hexahedron, the courier container 42 having a low cushioning property is used. An excellent buffering function is exerted on each of the inner walls, and deformation and damage due to collision of the luggage stored inside the courier container 42 with the container inner wall can be prevented. The assembly-type buffer heat insulating material 10A exhibits a heat insulating function for the courier container 42 with low heat insulation, and can cool and keep the baggage stored in the courier container 42 when it is food. It is.

  The assembled cushioning heat insulating material 10A is folded inward in the second direction so that the left and right side walls 14 and 15 overlap the bottom wall 11 when not in use, and the front and rear side walls 12 and 13 are above the left and right side walls 14 and 15. Folded in the second direction together with the top wall 16 connected to the side wall 12 so as to overlap with each other, and the thickness dimension when the walls 12 to 16 are folded is absorbed by the folding margins 27 and 32. Sometimes, it can be folded into a substantially flat shape substantially the same shape as the planar shape of the bottom wall 111, and is not bulky when not in use, and can be stored without taking up space when not in use. This assembled buffer heat insulating material 10A can be reassembled and used during home delivery, and can be reused multiple times.

  In the assembled buffer heat insulating material 10A, since the reinforcing adhesive tape 28 is fixed to the bent portions of the walls 11 to 16, separation at the bent portions of the walls 11 to 16 is prevented by the adhesive tape. The durability of the material 10A is improved. Even if the assembly-type buffer heat insulating material 10A is repeatedly assembled and folded a plurality of times, the walls 11 to 16 are not broken at each folding position, and the number of repeated reuses of the buffer heat insulating material 10A can be increased. it can.

  FIG. 7 is a development view of the assembled buffer heat insulating material 10B shown as another example, and FIG. 8 is a side view of the buffer heat insulating material 10B in a folded state. FIG. 9 is a diagram for explaining the mounting of the assembled buffer heat insulating material 10 </ b> B to the courier container 42. 10 is an end view taken along line 10-10 of FIG. 9, and FIG. 11 is an end view taken along line 11-11 of FIG. In addition, illustration of the film 22 is abbreviate | omitted in FIGS. 7 and 8, the first direction is indicated by an arrow A, the second direction intersecting the first direction is indicated by an arrow B (only in FIG. 7), and the thickness direction is indicated by an arrow C (only in FIG. 8).

  The assembled buffer heat insulating material 10B has a bottom wall 11, front and rear side walls 12, 13 (first side walls), left and right side walls 14, 15 (second side walls), left and right side walls 14, 15 and a rectangular parallelepiped (hexahedron) box shape formed in the first direction formed by the top wall 16 and detachably mounted inside the courier container 42. The assembly-type buffer heat insulating material 10B has a plate-shaped first foamed plate material 17 having a predetermined thickness dimension and extending in the first direction, and a plate-shaped second foam having a predetermined thickness dimension and extending in the second direction. It is formed from the plate material 18.

  The first and second foamed plate members 17 and 18 are made by joining a plurality of rod-shaped foams 19 extending in parallel in the same direction (see FIG. 3). A large number of independent bubbles (not shown) are formed inside the rod-shaped foams 19. Bubbles are not uniform in shape and size, and extend discontinuously and irregularly in all directions. The thickness dimensions of the foam plate members 17, 18 and the closed cell ratio and the average cell diameter of the rod-shaped foam 19 are the same as those of the buffer heat insulating material 10A in FIG.

  The first foamed plate member 11 forms a bottom wall 11, front and rear side walls 12, 13, and a top wall 16 among the walls 11 to 16 that define a rectangular parallelepiped. In these walls 11, 12, 13, and 16, the rod-like foams 29 forming the first foamed plate material 17 extend in parallel in the first direction. A polyolefin-based thermoplastic synthetic resin film 22 is joined to the upper and lower surfaces 20, 21 of the first foamed plate member 17 (see FIG. 3). The thickness dimension of the film 22 is the same as that of the buffer heat insulating material 10A of FIG. The film 22 may be bonded to one of the upper and lower surfaces 20 and 21 of the first foamed plate material 17, and the film 22 may not be bonded to the foamed plate material 17. As the polyolefin-based thermoplastic synthetic resin film 22, the same film as illustrated in the buffer heat insulating material 10A of FIG. 1 is used.

  The bottom wall 11 is formed into a rectangle whose planar shape is long in the first direction. The length of the bottom wall 11 in the second direction is shorter than that of the front and rear side walls 12 and 13 in the second direction. The front side wall 12 is formed into a rectangle whose planar shape is long in the second direction, and is connected to one of the side edges 23 in the first direction of the bottom wall 11. Between the bottom wall 11 and the front side wall 12, the 1st bending line 43 (cutting line toward the upper surface 20 from the lower surface 21 of the board | plate material 17) extended in a 2nd direction is formed. The first fold line 43 becomes the first direction side edge 23. A second fold line 44 (a cut line from the lower surface 21 to the upper surface 20 of the plate member 17) extending in the second direction is formed on the front side wall 12. The front side wall 12 can be bent via the folding lines 43 and 44, and can be turned in the first direction by the folding lines 43 and 44.

  A folding margin 45 is formed between the first folding line 43 and the second folding line 44. The dimension in the first direction of the folding allowance 45 is substantially the same as the total thickness dimension of the rear side wall 13 and the left side wall 14 or the right side wall 15 that overlap when the assembly-type cushioning heat insulating material 10B is folded. An adhesive tape extending in the second direction covering the fold lines 43 and 44 is provided at a connection portion (the upper surface 20 of the plate member 17) between the bottom wall 11 and the front side wall 12 with the first and second fold lines 43 and 44 as the center. 28 is fixed.

  The rear side wall 13 is shaped into a rectangle whose planar shape is long in the second direction, and is connected to the other side edge 23 of the bottom wall 11 in the first direction. Between the bottom wall 11 and the rear side wall 13, the 3rd bending line 46 (cutting line toward the upper surface 20 from the lower surface 21 of the board | plate material 17) extended in a 2nd direction is formed. The third fold line 46 becomes the first direction side edge 23. A fourth fold line 47 (a cut line from the lower surface 21 of the plate member 17 toward the upper surface 20) extending in the second direction is formed on the rear side wall 13. The rear side wall 13 can be bent via the folding lines 46 and 47 and can be turned in the first direction by the folding lines 46 and 47.

  A folding allowance 48 is formed between the third fold line 46 and the fourth fold line 47. The dimension in the first direction of the folding allowance 48 is substantially the same as the thickness dimension of the left side wall 14 or the right side wall 15 that overlap when the assembled buffer heat insulating material 10B is folded. Adhesive tape extending in the second direction covering the fold lines 46 and 47 is provided at a connecting portion (the upper surface 20 of the plate member 17) between the bottom wall 11 and the rear side wall 13 with the third and fourth fold lines 46 and 47 as the center. 28 is fixed.

  One of the top walls 16 is formed in a rectangular shape whose plan shape is long in the second direction, and is connected to the first direction side edge 33 of the front side wall 12. The other of the top walls 16 is formed into a rectangle whose planar shape is long in the second direction, and is connected to the first direction side edge 33 of the rear side wall 13. Between the front and rear side walls 12 and 13 and the top wall 16, a fifth fold line 49 (a cut line from the lower surface 21 of the plate member 17 toward the upper surface 20) extending in the second direction is formed. The fifth fold line 49 becomes the first direction side edge 33. The top wall 16 can be bent via a fifth fold line 49 and can be turned in the first direction by the fold line 49. An adhesive tape 28 extending in the second direction covering the fifth fold line is fixed to a connecting portion between the front and rear side walls 12 and 13 and the top wall 16.

  The second foamed plate material 18 forms left and right side walls 14 and 15 among the walls 11 to 16 that define a rectangular parallelepiped. On the left and right side walls 14, 15, the rod-like foams 19 forming the second foamed plate material 18 extend in parallel in the first direction. A polyolefin-based thermoplastic synthetic resin film 22 is joined to the upper and lower surfaces 35 and 36 of the second foamed plate material 17. The film 22 may be bonded to one of the upper and lower surfaces 35 and 36 of the second foamed plate material 18, and the film 22 may not be bonded to the foamed plate material 18.

  The left side wall 14 is formed into a rectangle whose planar shape is long in the first direction, and is connected (fixed with an adhesive) to one of both side edges 37 in the second direction of the bottom wall 11. A sixth fold line 50 (a cut line from the lower surface 21 of the plate member 18 toward the upper surface 20) extending in the first direction is formed on the left side wall 14, and a seventh fold line 51 (plate member) is formed at the center of the left side wall 14. 18, a cut line from the upper surface 20 toward the lower surface 21. The left side wall 14 can be bent via the sixth and seventh fold lines 50 and 51, and can be turned in the second direction by the fold lines 50 and 51. An adhesive tape 28 extending in the second direction covering the sixth fold line 50 is fixed to the left side wall 14 (the upper surface 35 of the plate 18). An adhesive tape 28 extending in the second direction covering the seventh fold line 51 is fixed to the central portion of the left side wall 14 (the lower surface 36 of the plate member 18).

  The right side wall 15 is formed in a rectangular shape whose plan shape is long in the first direction, and is connected to the other side edge 37 in the second direction of the bottom wall 11. An eighth fold line 52 (a cut line from the lower surface 21 to the upper surface 20 of the plate material 18) extending in the first direction is formed on the right side wall 15, and a ninth fold line 53 (plate material) is formed at the center of the right side wall 15. 18, a cut line from the upper surface 20 toward the lower surface 21. The right side wall 15 can be bent via the eighth and ninth fold lines 52 and 53, and can be turned in the second direction by the fold lines 52 and 53. An adhesive tape 28 extending in the second direction covering the eighth fold line 52 is fixed to the right side wall 15 (the upper surface 35 of the plate 18). An adhesive tape 28 extending in the second direction covering the ninth fold line 53 is fixed to the central portion of the right side wall 15 (the lower surface 36 of the plate member 18).

  A procedure for folding the assembled buffer heat insulating material 10B from the developed state of FIG. 7 to the state of FIG. 8 will be described as follows. The left side wall 14 is pivoted inward in the second direction via the sixth and seventh fold lines 50, 51, the left side wall 14 is folded at the fold lines 50, 51, and the left side wall 14 is overlaid on the bottom wall 11. Match. The left side wall 14 is folded into two layers by a seventh fold line 51. The right side wall 15 is pivoted inward in the second direction via the eighth and ninth fold lines 52 and 53, the right side wall 15 is folded along the fold lines 52 and 53, and the right side wall 15 is overlaid on the bottom wall 11. Match. The right side wall 15 is folded in two by a ninth fold line 53.

  The rear side wall 15 (including the top wall 16) is pivoted inward in the first direction via the third and fourth fold lines 46, 47, and the rear side wall 15 is folded at the fold lines 46, 47. 15 on top. Since the thickness of the overlapping left side wall 14 or right side wall 15 is absorbed by the folding margin 48 between the third fold line 46 and the fourth fold line 47, the left and right side walls 14, 15 and the rear side wall 13 are substantially parallel. overlap.

  The front side wall 12 (including the top wall 16) is pivoted inward in the first direction via the first and second fold lines 43, 44, the front side wall 14 is folded at the fold lines 43, 44, and the front side wall 14 is Overlay on the left and right side walls 14,15. Since the thicknesses of the overlapping rear side wall 13 and the left side wall 14 or the right side wall 15 are absorbed by the folding margin 45 between the first fold line 43 and the second fold line 44, the rear side wall 13 and the front side wall 12 are substantially the same. Overlapping in parallel. As shown in FIG. 8, the assembled buffer heat insulating material 10 </ b> B is folded into a substantially flat shape that is substantially the same shape as the planar shape of the bottom wall 11.

  The assembly procedure of the assembly-type buffer heat insulating material 10B and the attachment to the courier container 42 will be described with reference to FIG. 9 as follows. The front side wall 12 is turned inward in the first direction via the first fold line 43, the front side wall 12 is bent at a substantially right angle with respect to the bottom wall 11, and the rear side wall 13 is first changed via the third fold line 46. The rear side wall 13 is bent at a substantially right angle with respect to the bottom wall 11. The left side wall 14 is pivoted inward in the second direction via the sixth fold line 50, the left side wall 14 is bent at a substantially right angle with respect to the bottom wall 11, and the right side wall 15 is bent second through the eighth fold line 52. The right side wall 15 is bent at a substantially right angle with respect to the bottom wall 11. Next, the top wall 16 is turned in the first direction via the fifth fold line 49, and the top wall 16 is bent at a substantially right angle with respect to the front and rear side walls 12 and 13.

  When these walls 11 to 16 are bent via the folding lines 43, 46, 49, 50, and 52, a rectangular parallelepiped (box shape) buffer heat insulating material 10B is assembled in the first direction, and the buffer heat insulating material 10B is delivered to the home. It is mounted inside the stool container 42. The size of the assembled buffer heat insulating material 10B is slightly smaller than that of the courier container 42, and the buffer heat insulating material 10B can be mounted inside the courier container 42 as shown in FIG. .

  When the assembled buffer heat insulating material 10B is mounted inside the courier container 42, the bottom wall 11 comes into contact with the inner surface of the bottom wall of the container 42, and the front and rear side walls 12 and 13 come into contact with the inner surfaces of the front and rear side walls of the container 42. At the same time, the left and right side walls 14 and 15 come into contact with the inner surfaces of the left and right side walls of the container 42. In this state, the luggage is stored inside the buffer heat insulating material 10B, and the top wall of the courier container 42 is closed. When the top wall of the container 42 is closed, the top wall 16 contacts the inner surface of the top wall of the container 42. After the delivery is finished, the buffer heat insulating material 10B is taken out from the inside of the courier container 42, and the buffer heat insulating material 10B is folded by the above procedure.

  Since the assembled buffer heat insulating material 10B is used by being mounted inside the hexahedral courier container 42 made of plastic or plastic corrugated cardboard in a state of being assembled into a hexahedron, the courier container 42 having a low cushioning property is used. An excellent buffering function is exerted on each of the inner walls, and deformation and damage due to collision of the luggage stored inside the courier container 42 with the container inner wall can be prevented. The assembled buffer heat insulating material 10B exhibits a heat insulating function with respect to the courier container 42 with low thermal insulation, and can cool or keep warm when the luggage stored in the courier container 42 is food. It is.

  The assembled buffer heat insulating material 10B is folded inward in the second direction so that the left and right side walls 14 and 15 overlap the bottom wall 11 when not in use, and the front and rear side walls 12 and 13 are above the left and right side walls 14 and 15. Folded in the second direction together with the top wall 16 connected to the side walls 12 and 13 so as to overlap with each other, and the thickness dimension when the walls 12 to 16 are folded is absorbed by the folding margins 45 and 48. When not in use, it can be folded into a substantially flat shape that is substantially the same as the planar shape of the bottom wall 111, so that it does not become bulky when not in use, and a plurality of them can be stored without taking up space when not in use. This assembled buffer heat insulating material 10B can be reassembled and used during home delivery, and can be reused a plurality of times.

  In the assembly-type buffer heat insulating material 10B, the reinforcing adhesive tape 28 is fixed to the bent portions of the walls 11 to 16, so that separation at the bent portions of the walls 11 to 16 is prevented by the adhesive tape. The durability of the material 10B is improved. Even if the assembly-type shock-absorbing material 10B is repeatedly assembled and folded a plurality of times, the walls 11 to 16 are not broken at each folding position, and the number of repeated reuses of the buffer-insulating material 10B can be increased. it can.

  In the assembly-type shock-absorbing heat insulating material 10B, the extending direction of the rod-shaped foams 19 is the first direction between the top and bottom walls 11 and 16 and the front and rear side walls 12 and 13, so Even if a bending force acting inward or outward in the first direction acts on the walls 12, 13, 16 when swung in the direction, the resistance force of the rod-shaped foams 19 to the bending force is strong, and the top bottom The walls 11 and 16 and the front and rear side walls 12 and 13 are not inadvertently bent at portions other than the bent portion, and breakage of portions other than the bent portion can be prevented. In this assembled shock-absorbing heat insulating material 10B, the extending direction of the rod-shaped foams 19 in the left and right side walls 14 and 15 is the second direction. Therefore, when the left and right side walls 14 and 15 are swung in the second direction, 15, even if a bending force inward or outward in the second direction is applied, the resistance of the rod-shaped foam 19 to the bending force is strong, and the left and right side walls 14 and 15 are careless in portions other than the bent portion. It will not be bent, and breakage of parts other than the bent part can be prevented.

  FIG. 12 is a schematic view showing an example of a method for producing the first and second foamed plate members 17 and 18. These foamed plate materials 17 and 18 are manufactured by using an extruder 62 using a mixed pellet 60 (mixture) and a polyolefin-based thermoplastic synthetic resin 61 as raw materials. The mixed pellet 60 is made of paper powder (plant fiber powder), starch powder, shell calcined calcium powder, and charcoal powder, and is manufactured using a kneader or semi-dry / low moisture granulator, although not shown. Is done.

  As the polyolefin-based thermoplastic synthetic resin 61, either polypropylene or polyethylene or a resin obtained by mixing them at a predetermined ratio is used. As the polypropylene, at least one selected from block polymerized polypropylene, random polymerized polypropylene, homopolymerized polypropylene, and metallocene-polypropylene can be used. As the polyethylene, at least one selected from low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, metallocene catalyst polyethylene, modified polyethylene, and ethylene vinyl acetate (EVA) can be used. As the polypropylene, modified polypropylene obtained by reacting linear polypropylene, isoprene and a radical polymerization initiator can also be used. As the linear polypropylene, at least one of a propylene homopolymer, copolymer, block copolymer, and random copolymer can be used. As the radical polymerization initiator, a peroxide or an azo compound can be used.

  A modifying substance can be mixed in the synthetic resin 61. The modifying material preferably has a weight ratio with respect to the total weight of the synthetic resin 61 in the range of 0.1 wt% or more and 10 wt% or less. The modifying substance is a resin having an affinity for the synthetic resin 61, and its melt flow index is in the range of 0.1 to 15 g / 10 minutes, so that the fluidity of the synthetic resin 61 can be improved. Further, the modifying substance functions as a binder for bonding paper powder, starch powder, shell calcined calcium powder, and charcoal powder to the synthetic resin 51. The modifying material may be at least one of ethylene-propylene elastomer, hydrogenated styrene-butadiene rubber, and styrene-ethylenebutylene / olefin crystal block polymer. Hydrogenated styrene-butadiene rubber or styrene-ethylene butylene / olefin crystal block copolymer is a highly random copolymer formed from ethylene and butene-1, having no double bonds in the polymer molecule, and It is a highly transparent synthetic resin with low crystallinity and flexibility.

  Paper powder can be made by pulverizing paper (virgin paper) using a pulverizer. The paper powder can be made by finely pulverizing broken paper and broken paper generated during the production of paper, and can also be made by finely pulverizing waste paper. In addition to paper powder, vegetable fiber powder produced by pulverizing at least one of hardwood pulp and softwood pulp can also be used. Virgin paper, broken paper, broken paper, and pulp are free of fluorescent materials, heavy metals, and ink components.

  As the pulp, any one of mechanical pulp, chemical mechanical pulp, semi-chemical pulp, chemical pulp, or pulp obtained by mixing them in a predetermined ratio can be used. As the pulp, wood pulp is preferably used, but pulp obtained by mixing wood pulp with at least one of rag pulp, stalk cane pulp, and bast pulp can also be used. Used paper can be used as newspaper waste, magazine waste, printed waste paper, packaging waste paper, cardboard waste paper, and OA waste paper.

  As the starch powder, at least one of raw material starch and processed starch can be used. As the raw material starch, at least one of corn starch (corn starch), potato starch, wheat starch, rice starch and tapioca starch can be used. As the modified starch, at least one of a starch derivative, a starch degradation product, and a pregelatinized starch can be used. As the starch derivative, at least one of etherified starch, esterified starch and crosslinked starch can be used. As the starch degradation product, at least one of roasted dextrin and British gum, oxygen-modified dextrin, acid-decomposed starch, and oxidized starch can be used.

  In addition, it can replace with starch and can use potato pulp (dry starch grounds) or carboxymethylcellulose, and can also use the composite which mixed starch and carboxymethylcellulose by the predetermined ratio. A composite in which potato pulp and carboxymethyl cellulose are mixed at a predetermined ratio can also be used. Potato pulp is a powder and contains a large amount of starch.

  Shell-calcined calcium powder is a natural material and is not subjected to chemical treatment or chemical treatment. The shell is baked (baked) at a high temperature of 1200 to 1300 ° C. for a long time, and the baked shell is pulverized using a pulverizer. It is made by that. Charcoal powder is made by pulverizing charcoal using a pulverizer. In addition, the mixed pellet 60 may use paper powder (plant fiber powder) and starch powder as raw materials, and may use paper powder (plant fiber powder), starch powder, and shell calcined calcium powder as raw materials. Further, paper powder (plant fiber powder), starch powder and charcoal powder may be used as raw materials. The mixed pellet 60 may contain a powdery inorganic compound. As the inorganic compound, at least one of titanium oxide, talc, calcium carbonate, calcium sulfate, barium sulfate, kaolin, mica, and clay is used. The inorganic compound becomes a foam nucleating agent that adjusts the average cell diameter of the foamed plate materials 11 and 12.

  An example of a method for producing the mixed pellet 60 will be described as follows. Paper powder (plant fiber powder), starch powder, shell calcined calcium powder, charcoal powder and water are put into a kneader. These raw materials are kneaded by a kneader to produce a kneaded product containing a predetermined amount of moisture. The kneaded material produced by the kneader is conveyed to a granulator. The granulator is provided with a quantitative charging machine for charging a predetermined amount of the kneaded material. The granulator is equipped with a conical roller, a die and a cutter. The kneaded material conveyed from the kneader is put into the fixed amount feeder. The fixed amount feeder is used to put a predetermined amount of the kneaded material into the granulator while measuring the kneaded material. The kneaded material put into the granulator is pressed into a die by a conical roller while being re-kneaded inside the granulator, granulated into a cylindrical shape by the die, and then cut into a predetermined length by a cutter. , Processed into a plurality of mixed pellets 60.

Starch powder, its bulk density is in the 0.13 g / cm ³ or more and 0.17 g / cm ³ or less. If the bulk specific gravity of the starch powder is less than 0.13 g / cm ³ , the solidification action of the starch powder is weak, the form retention of the mixed pellet 60 is lowered, and the pellet form may not be maintained. If the bulk specific gravity of the starch powder exceeds 0.17 g / cm ³ , the specific gravity of the starch powder is significantly different from that of the paper powder, and the paper powder cannot be uniformly dispersed in the starch powder. Since the mixed pellet 60 has the bulk specific gravity of the starch powder in the above range, it can maintain the pellet form, and further, the paper powder can be uniformly dispersed in the starch powder.

  The mixing ratio of water with respect to the total weight of the kneaded product (the ratio of water injected into the kneading machine) is in the range of 20 wt% or more and 30 wt% or less. If the mixing ratio of water is less than 20% by weight, paper powder, starch powder, calcined shell calcium powder, and charcoal powder cannot be sufficiently kneaded. It cannot be uniformly dispersed. In addition, the kneaded material is remarkably increased in viscosity by kneading with a granulator, and a kneaded material having almost no fluidity is produced. Therefore, in the granulator, the kneaded material is crushed so that the mixed pellet 60 cannot be produced. is there.

  If the mixing ratio of water exceeds 30% by weight, the kneaded product cannot be imparted with an appropriate viscosity by kneading with the granulator, and the viscosity of the kneaded product is remarkably lowered, so that the mixed pellet 60 is formed in the granulator. It may not be possible. In the production of the mixed pellet 60, since the mixing ratio of water with respect to the total weight of the kneaded material is in the above range, a kneaded material having an appropriate viscosity and an appropriate fluidity can be produced in a granulator, and paper. A mixed pellet 60 in which powder, shell calcined calcium powder, and charcoal powder are almost uniformly mixed in the starch powder can be produced.

  The mixed pellet 60 retains the pellet shape because the starch powder is not gelatinized, contains a predetermined amount of water, and paper powder, starch powder, calcined shell calcium powder, and charcoal powder are joined together by hydrogen bonding. However, it easily collapses at a pressure of 100 to 490 N (collapse pressure). The starch powder contained in the pellet 60 is dissolved at a temperature of 110 ° C. or higher. Moreover, the moisture content of the pellet 50 is in the range of 12.0% or more and 20.0% or less. The mixed pellet 60 has a diameter of 1.0 mm to 5.0 mm and a length of 0.5 mm to 10.0 mm.

  The weight ratio of the paper powder (when the mixed pellet 60 is 100%) to the total weight of the mixed pellet 60 (mixture) is in the range of 20.0 wt% or more and 55.0 wt% or less. The weight ratio of the starch powder to the total weight of is in the range of 40 wt% or more and 75 wt% or less. The weight ratio of the shell calcined calcium powder to the total weight of the mixed pellet 60 is in the range of 2 wt% to 5 wt%, and the weight ratio of the charcoal powder to the total weight of the mixed pellet 60 is 2 wt% to 5 wt%. It is in the range of weight percent or less.

  When the weight ratio of the starch powder exceeds 75.0% by weight, a part of the starch powder may be gelatinized by frictional heat when kneading the paper powder, starch powder, shell calcined calcium powder or charcoal powder, and the pellet 60 May increase more than necessary, and the pellet 60 may not collapse at the collapse pressure. If the weight ratio of the paper powder exceeds 55.0% by weight, the ratio of the non-self-adhesive paper powder to the pellets 60 increases more than necessary, and a predetermined viscosity is imparted to the kneaded material by kneading with a granulator. The viscosity of the kneaded product is lowered, and the pellet 60 having a predetermined shape cannot be made. When the weight ratio of the shell-fired calcium powder is less than 2.0% by weight, the bactericidal action of the shell-fired calcium powder cannot be fully utilized. If the weight ratio of the charcoal powder is less than 2.0% by weight, the deodorizing action of the charcoal powder cannot be fully utilized.

  An example of a method for producing the foamed plate materials 17 and 18 will be described as follows. As shown in FIG. 12, the mixed pellet 60 and the synthetic resin 61 are put into a hopper 63 of an extruder 62, and water 64 is injected from the middle stage of the extruder 62 into the extruder 62. Inside the extruder 62, the mixed pellet 60 and the synthetic resin 61 are kneaded through the screw, and are heated to 120 to 190 ° C. by the heater of the extruder 62. The heater temperature can be set appropriately depending on the melting temperature of the synthetic resin 60.

  Inside the extruder 62, the synthetic resin 60 and starch powder are dissolved, and the high-temperature melt is formed by kneading the synthetic resin 60 and starch powder in which paper powder, shell calcined calcium powder, and charcoal powder are melted. Made. The high-temperature melt gradually moves toward the tip of the extruder 62 while being kneaded by the screw. The water 64 injected from the middle stage of the extruder 62 is mixed into the high-temperature melt through a screw. When the water 64 is mixed into the melt, the water 64 is instantly vaporized depending on the temperature of the melt. When the water 64 is vaporized, a large number of bubbles are formed inside the melt. A die (not shown) is attached to the tip of the extruder 62. A large number of circular holes are formed in the die. A peripheral wall extending from the peripheral edge in the extrusion direction of the melt is formed on the peripheral edge of the die.

  When the melt is extruded from a die attached to the extruder 62, the melt instantaneously expands at a predetermined magnification as the bubbles expand, and is discharged from the die as a plurality of rod-shaped foams 19. These rod-like foams 19 are prevented from diffusing outward in the circumferential direction by the peripheral wall, and gradually cool in a state of being in close contact with each other. Therefore, the rod-shaped foams 19 are heat-sealed by the heat of the rod-shaped foams 19, and the plate-shaped foamed plate members 17 and 18 are produced. The foamed plate materials 17 and 18 extruded from the die are solidified as the temperature decreases.

  A pair of rolls that press the upper and lower surfaces of the foam plate members 17 and 18 with a predetermined pressure are installed on the immediate upstream side of the die. A polyolefin-based thermoplastic synthetic resin film 22 in a tension state enters the peripheral surfaces of these rolls from the direction of the arrow. The conveyance speed of the film 22 is the same as the extrusion speed of the foamed plate materials 17 and 18. The film 22 is pressed against the upper and lower surfaces of the foam plate members 17 and 18 by rolls, and is heat-sealed to the upper and lower surfaces of the foam plate members 17 and 18 by the heat of the foam plate members 17 and 18.

  The temperature of the high-temperature melt before mixing of water 64 in the extruder 62 is in the range of 120 ° C. or higher and 190 ° C. or lower. If the temperature of the melt is less than 120 ° C., depending on the amount of mixed water 64, the water 64 does not instantly evaporate inside the melt, and foaming inside the melt becomes insufficient, and the foam plate 17 , 18 cannot create many bubbles. When the temperature of the melt exceeds 190 ° C, the properties of the synthetic resin 60, paper powder, and starch change depending on the temperature. In particular, the foamed plate materials 17 and 18 themselves are discolored when the paper powder becomes yellowed or darkened. End up. The expansion ratio per unit volume of the foamed plate materials 17 and 18 is 5 to 60 times, preferably 5 to 40 times. When the expansion ratio is less than 5 times, sufficient bubbles are not formed in the foamed plate materials 17 and 18, and the hardness of the foamed plate materials 17 and 18 increases more than necessary and the buffering property is lowered. When the expansion ratio exceeds 60 times, the strength of the foamed plate materials 17 and 18 is remarkably lowered, and the foamed plate materials 17 and 18 are collapsed by a slight impact.

  The weight ratio of the mixed pellets 50 (when the high temperature melt is 100% by weight) with respect to the total weight of the high temperature melt is in the range of 60% by weight or more and 80% by weight or less. The weight ratio of the polyolefin-based thermoplastic synthetic resin 61 with respect to the total weight of the high-temperature melt is in the range of 20 wt% or more and 40 wt% or less. When the weight ratio of the synthetic resin 61 is less than 20% by weight and the weight ratio of the mixed pellet 60 exceeds 80% by weight, foaming inside the high-temperature melt is insufficient, and only a few bubbles are present in the foamed plate materials 17 and 18. Is not formed, the heat insulation performance is lowered, and the hardness of the foamed plate materials 17 and 18 is increased more than necessary, so that the cushioning property and the shock absorbing property are lowered. When the weight ratio of the mixed pellets 60 is less than 60% by weight and the weight ratio of the polyolefin-based synthetic resin exceeds 40% by weight, the proportion of the synthetic resin having higher combustion calories than paper powder and starch increases, 18 burning calories increase.

  The paper powder has an average particle size in the range of 20 μm to 200 μm. The shell-baked calcium powder has an average particle size in the range of 10 μm to 50 μm. The charcoal powder has an average particle size in the range of 10 μm to 50 μm. If the average particle size of the paper powder is less than 20 μm, a plurality of crushing steps are required to process the paper powder into a particle size of less than 20 μm, and the production cost of the pellets 60 is increased. Production costs increase.

  If the average particle size of the paper powder exceeds 200 μm, the average particle size of the calcined shell calcium powder exceeds 50 μm, and the average particle size of the charcoal powder exceeds 50 μm, the paper powder or shell calcined calcium that does not exhibit fluidity The powder and charcoal powder cause poor dispersion inside the extruder, and the paper powder, the shell calcined calcium powder and the charcoal powder cannot be dispersed substantially uniformly in the foamed plate materials 17 and 18.

  The starch powder has an average particle size of 10 μm or more and 200 μm or less. If the average particle size of the starch powder is less than 10 μm, a plurality of steps are required to process the starch into a particle size of less than 10 μm, which increases the production cost of the starch powder. Production costs increase. When the average particle size of the starch exceeds 200 μm, it becomes difficult for the starch to dissolve, the starch causes poor dispersion in the synthetic resin 60, and the starch may form a bulky powder in the synthetic resin 60, There is a case where a lump of starch is formed inside the foamed plate members 17 and 18.

  Since the foamed plate materials 17 and 18 include paper powder, starch powder, shell calcined calcium powder, and charcoal powder, the calorie calorie thereof is lower than that in the case where the foamed plate material 17 and 18 are made only from the synthetic resin 61. In addition, the combustion calories of the foam board materials 17 and 18 are in the range of 4500 to 6000 Kcal / kg. By changing the mixing ratio of the synthetic resin, paper powder, starch powder, shell calcined calcium powder, and charcoal powder, the foamed plate materials 17 and 18 can adjust the burned calories within the above range. Since the foamed plate members 17 and 18 have a large number of bubbles formed therein, the foamed plate members 17 and 18 have high heat insulation properties and excellent cushioning properties and excellent shock absorption properties. The foamed plate materials 17 and 18 use a polyolefin-based thermoplastic synthetic resin 61 having no benzene ring, and since it contains paper powder and starch, only carbon dioxide is generated at the time of incineration, and soot is generated. Can be suppressed.

The expanded view of the assembly-type buffer heat insulating material shown as an example. The side view of the assembly-type buffer heat insulating material shown in the folded state. The elements on larger scale of a foam board material. The figure explaining mounting | wearing to the container for parcel delivery service of the assembled buffer heat insulating material. FIG. 5 is an end view taken along line 5-5 of FIG. FIG. 6 is an end view taken along line 6-6 of FIG. The expanded view of the assembly-type buffer heat insulating material shown as another example. The side view of the buffer heat insulating material in the folded state. The figure explaining mounting | wearing to the container for parcel delivery service of the assembled buffer heat insulating material. FIG. 10 is an end view taken along line 10-10 in FIG. 9; FIG. 11 is an end view taken along line 11-11 in FIG. 9; Schematic which shows an example of the manufacturing method of a 1st and 2nd foamed board | plate material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10A Assembling type | mold buffer heat insulating material 10B Assembling type | mold buffer heat insulating material 11 Bottom wall 12 Front side wall (1st side wall)
13 Rear side wall (first side wall)
14 Left side wall (second side wall)
15 Right side wall (second side wall)
16 Top Wall 17 First Foamed Plate Material 18 Second Foamed Plate Material 19 Rod-shaped Foam 20 Upper Surface 21 Lower Surface 22 Polyolefin Thermoplastic Synthetic Resin Film 24 First Folding Line 25 Second Folding Line 26 Third Folding Line 27 Folding Allowance 28 Adhesive Tape (Reinforcing tape)
29 4th fold line 30 5th fold line 31 6th fold line 32 fold allowance 34 7th fold line 35 upper surface 36 lower surface 38 8th fold line 39 9th fold line 40 10th fold line 41 11th fold line 42 courier Container 43 first fold line 44 second fold line 45 fold allowance 46 third fold line 47 fourth fold line 48 fold allowance 49 fifth fold line 50 sixth fold line 51 seventh fold line 52 eighth fold line 53 8th fold line 53 9 folding lines

Claims (8)

In the assembled cushioning insulation that is detachably mounted inside the hexahedral courier container made of plastic or plastic corrugated cardboard in a hexahedron state,
The assembled buffer heat insulating material includes a first foam plate extending in a first direction formed by joining a plurality of rod-shaped foams juxtaposed in the same direction, and a plurality of rod-shaped foams juxtaposed in the same direction. A pair of second foamed plate members made by joining and extending in a second direction intersecting the first direction, wherein the first foamed plate member comprises a bottom wall of the hexahedron, and the bottom wall Forming a first side wall that is foldably connected to both side edges in the first direction, and a top wall that is foldably connected to a first direction side edge of at least one of the first side walls; The plate material forms second side walls that are foldably connected to both side edges in the second direction of the bottom wall of the hexahedron,
When not in use, the second side walls are folded inward in the second direction so as to overlap the bottom wall, and the first side walls overlap the second side walls. Folded inward in the first direction together with the top wall connected to one side wall, and approximately the same dimension as the thickness when the bottom wall and the first side wall are overlapped with each other. An assembly-type shock-absorbing heat-insulating material that is folded into substantially the same shape as the planar shape of the bottom wall when not used.   In the top bottom wall and the first side walls, the rod-like foams forming the first foamed plate material are arranged in parallel in the first direction, and in the second side walls, the rod-like foams forming the second foamed plate material. The assembly-type buffer heat insulating material according to claim 1, wherein the foams are juxtaposed in the second direction.   The assembly type | mold buffer heat insulating material of Claim 1 or Claim 2 with which the reinforcement tape is attached to the bending location of those walls.   The first and second foamed plate materials are made from a mixture of plant fiber powder and starch powder finely pulverized to 20 to 200 μm via water and a polyolefin-based thermoplastic synthetic resin, and the mixture. The paper is made by adding water to a high-temperature melt obtained by mixing the synthetic resin with heating and foaming the melt at a predetermined magnification by vaporizing water in the high-temperature melt. The weight ratio of the powder is in the range of 20 to 55% by weight, and the weight ratio of the starch powder to the total weight of the mixture is in the range of 40 to 75% by weight. Assembling type buffer insulation.   The weight ratio of the mixture to the total weight of the high temperature melt is in the range of 60 to 80% by weight, and the weight ratio of the thermoplastic synthetic resin to the total weight of the high temperature melt is in the range of 20 to 40% by weight. The assembly-type buffer heat insulating material according to claim 4.   The assembled buffer heat insulating material according to claim 4 or 5, wherein the mixture contains 2 to 5% by weight of shell calcined calcium powder finely pulverized to 10 to 50 µm.   The assembly type | mold buffer heat insulating material in any one of Claims 4 thru | or 6 in which the said mixture contains 2-5 weight% charcoal powder finely ground to 10-50 micrometers.   The assembled buffer heat insulating material according to any one of claims 3 to 7, wherein a polyolefin-based thermoplastic synthetic resin film is bonded to at least the upper surface of the upper and lower surfaces of the first and second foamed plate members.

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