JP2012111547A - Three-dimensionally molded container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container which is flat and is not bulky in storage or distribution and is formed to be three-dimensional by heating when it is used.SOLUTION: The three-dimensionally molded container 101 includes: a mount 10 having a bottom face 11 and a side piece 12 connected with at least one of sides of the bottom face 11 through a folding ruled line 13; and a film part 20 having at least one heat-shrinkable film 21, and is fixed to the side piece 12 while the film part is overlapped with the mount 10 at an upper end of the side piece. Along with shrinkage of the heat-shrinkable film 21, the side piece 12 is raised.

Description

  The present invention relates to a three-dimensional molded container, and more particularly to a three-dimensional molded container that is three-dimensionalized by heating.

  In recent years, packaged foods that are heated or cooked using a microwave oven or the like have been distributed. As a container for these packaged foods, a flat pouch-shaped packaging bag in which the periphery of two front and back films is sealed has been proposed (for example, see Patent Document 1). There has been proposed a paper container made of a laminate of a paperboard and a biaxially stretched polyethylene terephthalate film and boxed with the biaxially stretched polyethylene terephthalate film side inside (see, for example, Patent Document 2). In addition, a plastic molded container that can utilize the packaging container as tableware without transferring the contents from the packaging container to another container after heating has been proposed (see, for example, Patent Document 3).

JP 2006-321519 A Japanese Patent Laid-Open No. 7-277318 JP 2005-35563 A

  The flat pouch-shaped packaging bags including Patent Document 1 can save space during storage and transportation, but have the inconvenience that the contents must be transferred to other containers such as tableware for eating and drinking. Further, since the heated packaging bag is very hot, it is troublesome to take it out of the microwave oven, open the packaging bag, and transfer it to another container. The paper containers including Patent Document 2 have a trouble of making a box at the time of use. Moreover, since there is no sealing property, it is not suitable for containing a liquid. The packaging containers including Patent Document 3 are bulky during storage and distribution and are difficult to handle. Moreover, since a certain amount of rigidity is required, there is a problem of disposal after use.

  An object of the present invention is to provide a container that is flat and not bulky at the time of storage or distribution and disposal, and that is molded into a three-dimensional shape by heating at the time of use.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a heat-shrinkable film can be molded into a three-dimensional shape by utilizing the force that shrinks by heating, and the present invention has been completed. It was. That is, the three-dimensional molded container according to the present invention includes a base having a bottom surface and a side piece connected to at least one side of the bottom surface via a crease, and at least one heat shrink film, and at least the side piece. And a film portion fixed in a state of being superposed on the mount at the upper end of the sheet, and the side piece stands up with the shrinkage of the heat shrink film.

  In the three-dimensional molded container according to the present invention, the side pieces are preferably provided on all sides of the bottom surface. It can be set as a more suitable container by the to-be-packaged thing with fluidity | liquidity.

  In the three-dimensionally molded container according to the present invention, the film portion has a bag shape formed by overlapping a heat-shrinkable film and a non-heat-shrinkable film and welding the periphery, and the non-heat-shrinkable film is on the mount side. It is preferable that they are fixed. The internal volume of the container can be increased and the container can be more suitable as a liquid container.

  In the three-dimensionally molded container according to the present invention, the film part is a bag shape formed by stacking a heat shrink film and a non-heat shrink film and welding the periphery, so that the heat shrink film is on the mount side. It is preferable to be fixed to. Since the inner volume of the container is large and the space between the mount and the film portion is hollow, a heat insulating effect is obtained, and the handleability of the container after heating is improved.

  In the three-dimensionally molded container according to the present invention, it is preferable that the film portion has a bag shape formed by overlapping a heat shrink film and a heat shrink film and welding the periphery. Since the space between the mount and the film portion becomes a cavity, a heat insulating effect is obtained, and the handleability of the container after heating is improved.

  In the three-dimensionally molded container according to the present invention, it is preferable that the film portions are overlapped across the side ends of the side pieces adjacent to each other. The inner volume of the container can be increased.

  In the three-dimensionally molded container according to the present invention, it is preferable that the film part is not fixed at a side end of the side piece. The inner volume of the container can be increased.

In the three-dimensional molded container according to the present invention, the area of the film part after shrinkage calculated from the area (Sb) when the film part is viewed from the front and the area shrinkage rate (Ra) due to heating of the heat shrinkable film is Sa, It is preferable that the area of the container opening formed after the side piece rises is Sp, and the area ratio (Sa / Sp) satisfies Formula 1. It is possible to make the container more excellent in appearance.
(Equation 1) Sa / Sp = Sb × (1-Ra) /Sp=0.50-1.90

  In the three-dimensionally molded container according to the present invention, it is preferable that the surface of the non-heat-shrinkable film on the heat-shrinkable film side has a metal vapor deposition part. Since microwaves can be used to burn the package, it can be made particularly suitable as a food container.

  In the three-dimensional molded container according to the present invention, it is preferable that a microwave heating film in which a metal vapor deposition portion is provided on the surface of the non-heat-shrinkable film is further provided inside the three-dimensional molded container. Since microwaves can be used to burn the package, it can be made particularly suitable as a food container.

  INDUSTRIAL APPLICABILITY The present invention can provide a container that is flat and not bulky during storage or distribution, and that is molded into a three-dimensional shape by heating during use.

The three-dimensional molded container according to the first embodiment is shown before three-dimensional molding, (a) is a top view, and (b) is an AA broken sectional view of (a). The three-dimensional shaping | molding container which concerns on 1st embodiment is shown after the three-dimensional shaping | molding, (a) is a perspective view, (b) is a BB fracture | rupture sectional view of (a). It is a top view which shows the modification of the three-dimensional molded container which concerns on 1st embodiment. It is a fracture surface figure showing after solid fabrication of a solid molding container concerning a second embodiment. It is a fracture surface figure which shows after the three-dimensional shaping | molding of the three-dimensional shaping | molding container which concerns on 3rd embodiment. The three-dimensional shaping | molding container which concerns on 4th embodiment is shown before the three-dimensional shaping | molding, (a) is a top view, (b) is CC broken sectional drawing of (a). The three-dimensional shaping | molding container which concerns on 4th embodiment is shown after three-dimensional shaping | molding, (a) is a perspective view, (b) is DD fracture | rupture sectional drawing of (a). The solid molded container which concerns on 5th embodiment is shown, (a) is a top view before solid molding, (b) is a perspective view after solid molding. It is a top view before the three-dimensional shaping | molding of the three-dimensional shaping | molding container which concerns on 6th embodiment. The solid molded container which concerns on a 7th form is shown, (a) is a top view before solid molding, (b) is a perspective view after solid molding.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

(First embodiment)
With reference to FIG.1 and FIG.2, the three-dimensional molded container which concerns on 1st embodiment is demonstrated. FIGS. 1A and 1B show a three-dimensional molded container according to the first embodiment before three-dimensional molding, in which FIG. 1A is a top view and FIG. FIG. 2 shows a three-dimensionally molded container according to the first embodiment after three-dimensional molding, in which (a) is a perspective view and (b) is a BB fracture cross-sectional view of (a). The three-dimensionally molded container 101 according to the first embodiment includes a base 10 having a bottom surface 11 and a side piece 12 connected to at least one side of the bottom surface 11 via a crease 13 and at least one heat shrink film 21. And at least the upper end 12 a of the side piece 12 and a film portion 20 that is fixed in a state of being superimposed on the mount 10, and the side piece 12 rises as the heat shrinkable film 21 contracts.

  The mount 10 is a planar plate material before three-dimensional molding (before heating). In the three-dimensional molded container 101 according to the first embodiment, the side piece 12 is connected to the rectangular bottom surface 11 and all sides of the bottom surface 11 via the crease 13. By providing the side pieces 12 on all sides of the bottom surface 11, the side pieces 12 form side walls over the entire circumference, so that the container can be made more suitable for the flowable article 1.

The material of the mount 10 can be selected according to the application, for example, paper, plastic, metal, and wood. Among these, it is preferable to mainly use paper in terms of heat resistance and workability. Preferably the basis weight of the paper is 100 to 600 / ^{m 2,} more preferably 250~470g / ^{m 2.} In the case of using paper as a main component, for example, a single-layer or multi-layer paperboard, a paper material such as corrugated cardboard, or a laminate in which plastic is laminated on one or both sides of the paper material. Laminates are, for example, laminates in which plastic is melt-extruded and laminated to a paper material to form a plastic layer, laminates in which plastic is applied to a paper material to form a plastic layer, or a laminate in which a plastic sheet is bonded to a paper material Is the body. These laminates are sometimes called laminated paper or milk carton paper. Plastics laminated on paper materials are, for example, polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyamide (nylon), polyamideimide, polyvinylidene chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer Polycarbonate. Among these, polyethylene and polypropylene are more preferable in terms of excellent heat sealability and water resistance. Although the thickness of the mount is not particularly limited, for example, when milk carton paper is used as the mount, it is preferably 0.2 to 2.0 mm. More preferably, it is 0.4-0.8 mm.

  The film unit 20 has at least one heat shrink film 21. The heat-shrinkable film 21 is a packaging material that utilizes the property that a film stretched uniaxially or biaxially shrinks by heating, and is sometimes called a shrink film. The material of the heat shrink film 21 is, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl chloride, polyvinylidene chloride, ionomer, polyethylene terephthalate, or polystyrene. The configuration of the heat shrinkable film 21 may be either a single layer or a multilayer, but it is multilayer in that the packaging material design such as imparting functions such as barrier properties and heat resistance, and improving workability such as heat sealability can be facilitated. Preferably there is. Moreover, it is preferable that the outermost layer has heat sealability. In the present embodiment, the material and configuration of the heat shrink film 21 are not particularly limited. Moreover, as the heat-shrinkable film 21, for example, a commercial product such as a trade name Kurehalon MLB-1000 manufactured by Kureha Co., Ltd. can be used.

The heat shrink film 21 is more preferably a biaxially stretched film. Furthermore, the ratio (Rm / Rt) of the thermal contraction rate (Rm) in the vertical direction (MD direction) and the thermal contraction rate (Rt) in the horizontal direction (TD direction) is 0.80 to 1.50. preferable. More preferably, it is 0.90-1.30. Here, the MD direction thermal shrinkage rate (Rm) is the length in the MD direction before shrinkage is Lm0, and the length in the MD direction after shrinkage immersed in hot water at 80 ° C. for 10 seconds is Lm1, It is the thermal shrinkage rate in the MD direction of the film calculated by Equation 2. The thermal contraction rate (Rt) in the TD direction is the contraction rate in the TD direction and can be calculated in the same manner as Rm.
(Formula 2) Rm [%] = Lm1 / Lm0 × 100

  The thickness of the heat shrink film 21 is preferably 10 to 100 μm. More preferably, it is 30-80 micrometers.

  The film part 20 is fixed to the mount 10 at least at the upper end 12 a of the side piece 12. By fixing the film portion 20 at the upper end 12a of the side piece 12, the side piece 12 is raised by the force that the heat shrink film 21 contracts, and the planar mount 10 is made into a three-dimensional box-shaped container. Can do. As shown in FIG. 2, after the three-dimensional molding, the side piece 12 becomes the side wall of the container. The range for fixing the mount 10 and the film part 20 is not particularly limited as long as the side piece 12 can stand up. For example, in the three-dimensional molded container 101 according to the first embodiment, it is fixed over the entire width of the upper end 12a of the side piece 12, but it may be fixed locally. Moreover, a fixed pattern is not specifically limited, For example, it is good also as a dot form other than a line form.

  In the three-dimensionally molded container 101 according to the first embodiment, as shown in FIG. 1B, the film part 20 is a bag shape formed by overlapping a heat shrink film 21 and a non-heat shrink film 22 and welding the periphery. The non-heat-shrinkable film 22 is fixed so as to be on the mount 10 side. As in the three-dimensional container 101 according to the first embodiment, the film part 20 is preferably bag-shaped. By making it into a bag shape, there are advantages such that barrier properties can be easily imparted, the material of the mount 10 can be simplified, or three-dimensional molding can be performed smoothly.

  The package 1 is sealed in a bag formed of a heat shrink film 21 and a non-heat shrink film 22. The package 1 is, for example, fresh food, cooked or semi-cooked food. The food is, for example, corn, green soybeans, potatoes, dumplings, curry, stew, cooked rice, noodles, meat, fish, eggs. In this embodiment, it is not limited to the kind of the to-be-packaged object 1, The to-be-packaged object 1 is a screw, a volt | bolt, a nut, a button, and a bead other than foodstuffs, for example.

  The non-heat-shrinkable film 22 is a single layer plastic film (hereinafter referred to as a single layer film) or a laminated plastic film (hereinafter referred to as a laminated film). A laminated film is more preferable from the viewpoint of easy packaging design such as imparting functions such as barrier properties and heat resistance and improving workability such as heat sealability. When the non-heat-shrinkable film 22 is a single layer film, it is preferable to have heat sealability. Examples of the single-layer film having heat sealability include a polyethylene film, a polypropylene film, a polyethylene terephthalate film, a polyamide film, an ethylene-vinyl acetate copolymer film, and a polycarbonate film. When the non-heat-shrinkable film 22 is a laminated film, it is preferable that the outermost layer has heat sealability. The composition of the laminated film is, for example, a film of two or more layers comprising a sealant film and other films. Examples of the sealant film include a polyethylene film, a polypropylene film, an ethylene-vinyl acetate copolymer film, a polycarbonate film, and a polyethylene film. A terephthalate film or a polyamide film. As other films, for example, polyethylene film, polypropylene film, polyamide film, polyethylene terephthalate film, ethylene-vinyl alcohol copolymer, film deposited with silica, alumina or aluminum, organic coat film, polyglycolic acid film (PGA) ), A polylactic acid film (PLA), a film coated with polyvinylidene chloride, an aluminum foil, paper, and a nonwoven fabric. Although the thickness of the non-heat-shrink film 22 is not particularly limited, for example, the total thickness is 10 to 300 μm.

  When the three-dimensionally shaped container 101 according to the first embodiment is heated and three-dimensionally formed, the heat shrink film 21 is shrunk and the side pieces 12 are erected to form a rectangular box-shaped container as shown in FIG. The heat-shrinkable film 21 becomes a cuboid top surface, and the non-heat-shrinkable film 22 forms a recess along the bottom surface 11 and the side piece 12 of the mount 10. Since the article to be packaged 1 is accommodated in a recess formed by the non-heat-shrinkable film 22, the three-dimensionally molded container 101 according to the first embodiment is a substance in which the object to be packaged 1 has fluidity such as a liquid or a viscous body. It is particularly suitable for

  In the three-dimensional molded container 101 according to the first embodiment, the non-heat-shrinkable film 22 is preferably fixed to the bottom surface 11. By fixing the non-heat-shrinkable film 22 to the bottom surface 11, the non-heat-shrinkable film 22 more reliably forms a recess along the bottom surface 11 and the side piece 12 of the mount 10. It is possible to avoid unintentional cutting and to easily perform opening. Moreover, it can prevent that the package 1 after opening is spilled. Although the range which fixes the non-heat-shrink film 22 and the bottom face 11 is not specifically limited, For example, as shown by the code | symbol P of Fig.1 (a), fixing along the periphery of the bottom face 11 is possible. preferable.

  The film part 20 is preferably provided with an opening means. Opening means is, for example, a method of providing a cut (notch) in the welded part of the film part so that it can be opened by hand, when a cut derivative such as a tearing thread or a cut tape is fixed inside the film part and the cut derivative is drawn. In this method, the film is cut by the shearing force of the film. Furthermore, when the film part is composed of a laminated film, there is a method in which perforations, fine holes, scratches, etc. are applied to a part or the whole of the base film.

  The three-dimensionally molded container 101 according to the first embodiment includes a form in which the non-heat-shrinkable film 22 is a plastic film layer laminated on the entire surface of the mount 10 on the side on which the film unit 20 is fixed.

  The film part 20 preferably has a vapor passage means (not shown) when the internal pressure in the container is increased by heating, such as the expansion of air and the generation of water vapor from the package 1. The steaming means is not particularly limited. For example, a method of providing a vent hole for degassing in the film part 20, a method of performing a half cut on a part of the film part 20, and a part easily peeled off at a part of the welded part. It is a method of providing.

The area shrinkage ratio (Ra) of the heat-shrinkable film can be appropriately selected according to the dimensions of the container, the height of the side wall formed by the side piece 12 after the three-dimensional molding, the material of the mount 10, and the like. In the three-dimensionally molded container 101 according to the first embodiment, from the area (Sb) when the film part 20 before the three-dimensional molding shown in FIG. 1A is viewed from the front and the area shrinkage rate (Ra) due to heating of the heat shrinkable film 21. The area of the film portion after shrinkage calculated is Sa, the area of the container opening 15 formed after the side piece 12 shown in FIG. 2A stands is Sp, and the area ratio (Sa / Sp) is It is preferable to satisfy. By setting the area ratio (Sa / Sp) within this range, the container can be made more excellent in appearance.
(Equation 1) Sa / Sp = Sb × (1-Ra) /Sp=0.50-1.90

  The area ratio (Sa / Sp) is more preferably 0.60 to 1.78, and particularly preferably 0.95 to 1.00.

The area shrinkage rate (Ra) is obtained by Equation 3 when the reference area before shrinkage is S0 and the area after shrinkage immersed in hot water at 80 ° C. for 10 seconds is S1.
(Expression 3) Ra = (S0-S1) / S0

  As in the three-dimensional molded container 101 according to the first embodiment, the film part 20 is preferably overlapped across the side ends 12b of the adjacent side pieces 12. The portion straddling between the side ends 12b of the adjacent side pieces 12 is a portion indicated by reference numeral 8 in FIG. FIG. 3 is a top view showing a modification of the three-dimensionally molded container according to the first embodiment. In the three-dimensional molded container 101a of the modified example shown in FIG. 3, the mount 10 and the film part 20a have the same contour shape and are completely overlapped, and the film part 20a is between the side edges 12b of the adjacent side pieces 12. Not across. Similar to the three-dimensionally molded container 101 according to the first embodiment, the three-dimensionally molded container 101a of the modified example forms a rectangular parallelepiped box-shaped container as shown in FIG. However, when the three-dimensional molded container 101 according to the first embodiment is compared with the three-dimensional molded container 101a of the modified example, the film portion 20 is overlapped across the side ends 12b of the adjacent side pieces 12. It can be seen that the film part 20 of the three-dimensional molded container 101 according to the embodiment has a larger internal volume than the film part 20a of the three-dimensional molded container 101a of the modified example. Therefore, the internal volume can be further increased by overlapping the film portions 20 across the side ends 12b of the adjacent side pieces 12.

(Second embodiment)
FIG. 4 is a broken cross-sectional view showing the three-dimensional molded container according to the second embodiment after three-dimensional molding. In the three-dimensionally molded container 102 according to the second embodiment, the film portion 20b has a bag shape formed by overlapping the heat shrink film 21 and the non-heat shrink film 22 and welding the periphery, and the heat shrink film 21 is a mount. It is fixed so as to be on the 10 side. The three-dimensional molded container 102 according to the second embodiment has the same configuration as the three-dimensional molded container 101 according to the first embodiment except that the heat-shrinkable film 21 is fixed so as to be on the mount 10 side.

  When the three-dimensionally molded container 102 according to the second embodiment is heated and three-dimensionally formed, the heat-shrinkable film 21 contracts and the side piece 12 stands. As shown in FIG. 4, the film portion 20 b is stretched in a substantially horizontal state with the bottom surface 11 with the upper end 12 a of the standing side piece 12 as a fulcrum. The package 1 is sealed in a bag formed of a heat shrink film 21 and a non-heat shrink film 22. A space 16 is formed between the mount 10 and the heat shrink film 21. The space 16 makes it difficult for the heat of the article 1 to be transmitted to the mount 10 and facilitates handling of the container after heating. The three-dimensionally molded container 102 according to the second embodiment is particularly suitable when the packaged object 1 is a substance with low fluidity such as a solid substance and when it is a substance that tends to become high temperature by heating.

(Third embodiment)
FIG. 5 is a broken cross-sectional view showing the three-dimensional molded container according to the third embodiment after three-dimensional molding. As shown in FIG. 5, in the three-dimensionally molded container 103 according to the third embodiment, the film part 20c has a bag shape formed by overlapping the heat shrink film 21a and the heat shrink film 21b and welding the periphery. The three-dimensionally molded container 103 according to the third embodiment has a bag shape in which the film portion 20c is formed by the heat shrink film 21a and the heat shrink film 21b, and the heat shrink film 21b and the mount 10 are fixed. The configuration is the same as that of the three-dimensional molded container 101 according to the first embodiment. From here, for convenience, the heat shrink film 21b fixed to the mount 10 is referred to as a lower heat shrink film, and the other heat shrink film 21a is referred to as an upper heat shrink film. It does not matter whether the upper heat shrink film 21a and the lower heat shrink film 21b are made of the same material or different materials. The film portion 20c can be formed by folding a single heat-shrink film (not shown) at the center and welding the periphery.

  When the three-dimensionally molded container 103 according to the third embodiment is heated and three-dimensionally formed, the upper heat shrink film 21a and the lower heat shrink film 21b shrink, and the side piece 12 stands. As shown in FIG. 5, the film portion 20 c is stretched in a substantially horizontal state with the bottom surface 11 with the upper end 12 a of the standing side piece 12 as a fulcrum. The package 1 is disposed between the upper heat shrink film 21a and the lower heat shrink film 21b. A space 16 is formed between the mount 10 and the lower heat-shrink film 21b, and heat of the package 1 is not easily transmitted to the mount 10, so that the container after heating becomes easy to handle. The three-dimensionally molded container 103 according to the third embodiment is particularly suitable when the packaged object 1 is a substance with low fluidity such as a solid substance or when it is a substance that easily becomes high temperature by heating. Further, in the three-dimensionally molded container 103 according to the third embodiment, the two heat shrink films of the upper heat shrink film 21a and the lower heat shrink film 21b are shrunk and the side piece 12 is erected, which relates to the first embodiment. The material of the mount 10 is made harder than the 3D molded container 101 and the 3D molded container 102 according to the second embodiment, the thickness of the mount 10 is increased, or the height of the side piece 12 after rising is increased. Can be. Moreover, the upper heat shrink film 21a and the lower heat shrink film 21b can be brought into close contact with the article 1 by providing the vapor passage means (not shown) in the film portion 20c.

(Fourth embodiment)
6A and 6B show a three-dimensional molded container according to the fourth embodiment before three-dimensional molding, in which FIG. 6A is a top view and FIG. 6B is a CC broken cross-sectional view of FIG. FIGS. 7A and 7B show a three-dimensional molded container according to the fourth embodiment after three-dimensional molding, in which FIG. 7A is a perspective view and FIG. 7B is a DD broken sectional view of FIG. The three-dimensionally molded container 104 according to the fourth embodiment has the same configuration as the three-dimensionally molded container 101 according to the first embodiment, except that the film portion 20d is composed of one heat-shrinkable film 21.

  In the three-dimensional molded container 104 according to the fourth embodiment, it is preferable to have the connecting piece 4 connected via the folding line 14 between the side ends 12b of the side pieces 12 that are adjacent to each other. A crease 14 or a perforation (not shown) is formed at the center of the connecting piece 4 so that the connecting piece 4 can be folded in two. After the three-dimensional molding, as shown in FIG. 7A, the connecting piece 4 can be folded inside the container to seal the article to be packaged 1 in the container and hold it more reliably.

  In the three-dimensionally molded container 104 according to the fourth embodiment, since the package 1 is in contact with the mount 10d, the mount 10d is a laminated body such as laminated paper in which plastic is laminated on one side or both sides of a paper material, or milk carton paper. Preferably there is. As the laminate, the laminate exemplified in the first embodiment can be used. However, when the package is a food, the laminate of the paper layer and the plastic layer made of polyethylene is used from the viewpoint of heat sealability and hygiene. More preferably, it is a body. Moreover, by using a laminated body for the mount 10 and further providing the connecting piece 4, the package 1 can be made suitable as a container for a fluid substance such as a liquid.

(Fifth embodiment)
It is preferable that the film part 20 is not fixed at the side end 12b of the side piece 12. FIG. 8 shows a three-dimensionally molded container according to the fifth embodiment, wherein (a) is a top view before three-dimensional molding, and (b) is a perspective view after three-dimensional molding. The three-dimensional molded container 105 according to the fifth embodiment shown in FIG. 8 is the three-dimensional molded container 101 according to the first embodiment shown in FIG. 1 except that the film portion 20 is fixed at the side end 12b of the side piece 12. It has the same configuration as. When the film part 20 is fixed at the side end 12 b of the side piece 12, the three-dimensionally formed container is formed as a three-dimensionally formed container. However, the space that can accommodate the article 1 to be packaged is substantially the bottom surface 11 of the film part 20. Therefore, the internal volume is reduced. When the internal volume becomes small, the internal pressure inside the container becomes too high, and there is a possibility of expanding into a dome shape as shown in FIG. Moreover, the heat shrink of the part which overlaps with the side piece 12 among the heat shrink films 21 is controlled, and the side piece 12 cannot be raised in a desired state, and the shape of the container may be distorted. Further, since heat is hardly transmitted to the portion 8 of the film portion 20 that is overlapped between the side edges 12b of the adjacent side pieces 12, the sign of FIG. Like 21c, it may protrude from a container and an external appearance may worsen.

(Sixth embodiment)
FIG. 9 is a top view of the three-dimensional molded container according to the sixth embodiment before three-dimensional molding. The three-dimensional molded container 106 according to the sixth embodiment shown in FIG. 9 is the same as the three-dimensional molded container according to the first embodiment shown in FIG. 3 except that the film portion 20a is fixed at the side end 12b of the side piece 12. The configuration is the same as that of the modification 101a. Similarly to the three-dimensional molded container 105 according to the fifth embodiment, the three-dimensional molded container 106 according to the sixth embodiment is formed as a three-dimensional molded container after the three-dimensional molding. There is substantially only a portion overlapping the bottom surface 11 of the film portion 20a, and the internal volume becomes small, so that the internal pressure inside the container becomes too high, and there is a risk of expanding into a dome shape as shown in FIG. 8B. There is. Moreover, the heat shrink of the part which overlaps the side piece 12 among heat shrink films is controlled, the side piece 12 cannot be stood up in a desired state, and the shape of a container may become distorted.

(Seventh embodiment)
FIG. 10 shows a three-dimensionally molded container according to the seventh embodiment, (a) is a top view before three-dimensional molding, and (b) is a perspective view after three-dimensional molding. As in the first to sixth embodiments, it is more preferable that the side piece 12 is connected to all sides of the bottom surface 11 via the crease 13, but the present invention is not limited to this. For example, the form which has the side which the bottom face 11 has not connected the side piece 12 like the three-dimensional molded container 107 which concerns on 7th embodiment shown in FIG. In addition, in 1st embodiment to 7th embodiment, although the shape of the bottom face 11 was made into the rectangle, as long as there exists an effect of this invention, it is not limited to this. Examples of the shape of the shape of the bottom surface 11 are, for example, a rectangle, a triangle, a pentagon, and a hexagon.

(Eighth embodiment)
In the three-dimensional molded container according to the eighth embodiment, it is preferable that a microwave heating film in which a metal vapor deposition portion is provided on the surface of the non-heat-shrinkable film is further provided inside the three-dimensional molded container. The film for microwave heat generation has the function of burning, scorching, or crispy the surface of the packaged object by utilizing the fact that the metal in the metal vapor deposition part absorbs microwaves and induces heat generation ( Hereinafter, in the present specification, such a function is sometimes referred to as a “susceptor function”. Induction heat generation means that when an electric field passes through a metal vapor deposition layer, current is generated in the metal vapor deposition layer to generate heat.

  As the non-heat-shrinkable film constituting the microwave heating film, those exemplified above as the non-heat-shrinkable film 22 constituting the film part 20 of the three-dimensionally molded container 101 according to the first embodiment can be used. In addition, it is not ask | required whether a non-heat-shrink film is a single layer film or a laminated film.

  The metal vapor deposition part is formed by forming a metal thin film (hereinafter referred to as a metal vapor deposition layer) on the surface of the non-heat-shrinkable film. Examples of the metal include aluminum, tin, chromium, zinc, gold, silver, copper, platinum, nickel, stainless steel, and indium oxide. Among these, when used as a food container, aluminum is particularly preferable. The metal vapor deposition layer can be formed by a generally known vapor deposition method. Commonly known vapor deposition methods are, for example, vacuum vapor deposition, ion plating, sputtering, and ion beam.

  The metal vapor deposition section is preferably half vapor deposition. Half vapor deposition refers to a vapor deposition mode in which the thickness of a metal vapor deposition layer is thinner than the average thickness of a general metal vapor deposition layer in a packaging material and has the property of transmitting visible light. That is, although the average thickness of the metal vapor deposition layer of the metal vapor deposition film used as a packaging material is generally 20 to 50 nm, in this embodiment, the average thickness of the metal vapor deposition layer is 0.01 to 25 nm. It is preferable that More preferably, it is 0.1-10 nm, Most preferably, it is 1-5 nm. By setting it as this range, generation | occurrence | production of the spark (spark) by microwave irradiation can be prevented. Moreover, the calorific value by induction heat generation can be adjusted moderately, and excessive heating can be prevented. Further, since the light can be transmitted, the user can visually confirm the packaged object even in the form in which the microwave heating film covers the packaged object 1.

  A three-dimensionally molded container with a susceptor function is provided by arranging the microwave heating film inside the three-dimensionally molded containers 101, 101a, 102, 103, 104, 105, 106, 107 according to the first to seventh embodiments. can do. Three-dimensional molded container The interior of the three-dimensional molded containers 101, 101a, 102, 103, 104, 105, 106, 107 is a space in which the article to be packaged 1 is accommodated, and is a position in direct contact with the article to be packaged 1. is there. Specifically, for example, when described using the three-dimensional molded container 101 according to the first embodiment shown in FIG. 1, the inside of the bag formed by the heat shrink film 21 and the non-heat shrink film 22 as the film part 20. . Moreover, if it demonstrates using the three-dimensional molded container 104 which concerns on 4th embodiment shown in FIG. 6, it is between the heat-shrink film 21 and the mount 10 as the film part 20. FIG. The microwave heat generating film is preferably fixed to the non-heat-shrinkable film 22 or the mount 10.

  The film for microwave heat generation is disposed by bringing the metal vapor deposition portion into contact with an object to be packaged. If it demonstrates using FIG. 1, it is preferable to provide a metal vapor deposition part in the position corresponding to the bottom face 11 of the mount 10 at least. Moreover, in this embodiment, the film for microwave heat_generation | fever can be arrange | positioned 1 sheet, or 2 or more sheets. In the case of arranging two or more sheets, charred marks can be formed on both sides of the packaged object by arranging them on the top and bottom of the packaged object (on the bottom surface 11 side and the container opening 15 side of the mount 10 in FIG. 2). .

  The non-heat-shrinkable film 22 as the film portion 20 as in the three-dimensional molded containers 101, 101a, 102, 103, 105, 106, 107 according to the first embodiment to the third embodiment and the fifth embodiment to the seventh embodiment. In a three-dimensionally molded container having a structure, a non-heat-shrinkable film 22 constituting the film part 20 is also used as a non-heat-shrinkable film for a microwave heat generating film, so that a three-dimensionally molded container with a susceptor function having a simpler structure is obtained Can do. That is, when it demonstrates using FIG.1 and FIG.2, in the three-dimensional molded container which concerns on the modification of 8th embodiment, the surface by the side of the heat shrink film 21 of the non-heat shrink film 22 has a metal vapor deposition part (not shown). It is preferable to have. The surface of the non-heat-shrinkable film 22 on the heat-shrinkable film 21 side is a surface that directly contacts the package 1.

  The three-dimensionally molded container with a susceptor function according to the eighth embodiment and its modification is particularly suitable when the packaged item is food. Among foods, it is suitable for foods that are appetizing by being burnt or foods that have a crunchy texture. Examples of such foods include various fried foods such as pizza, french fries, dumplings, fish, croquettes, fried shrimps, French toast, bread, and hot cakes.

  Next, an example of a method for producing the three-dimensional molded container according to the first embodiment will be described. In addition, this invention is not restrict | limited to a manufacturing method, as long as there exists an effect of this invention.

(Mounting process)
The manufacturing process of the mount 10 includes a crease processing process for processing a crease on a plate material (base paper) to be the mount 10 and a punching process for cutting the base paper into a predetermined shape for each container. The order in which the crease forming process and the punching process are performed is not limited. For example, the crease forming process can be performed before the punching process, the punching process can be performed before the crease forming process, or the crease forming process and the punching process can be performed simultaneously. Moreover, the process of printing on a base paper can be performed as needed.

(Blank sheet manufacturing process)
The blank sheet manufacturing process is a process of obtaining a blank sheet in a state where the film part 20 is fixed to the mount 10 obtained in the mount manufacturing process at least at the upper end of the side piece 12 so that the article 1 can be filled. is there. In the three-dimensional molded container according to the first embodiment, the non-heat-shrinkable film 22 and the heat-shrinkable film 21 are overlapped and the periphery is welded to form a bag. Next, the non-heat-shrinkable film 22 of the bag is placed on the mount 10 side and fixed at the upper end 12a of the side piece 12 to obtain a blank sheet. Alternatively, the non-heat-shrinkable film 22 is fixed to the mount 10 at the upper end 12 a of the side piece 12, and then the non-heat-shrinkable film 22 and the heat-shrinkable film 21 are overlapped to leave the opening side and the periphery is welded. To obtain a blank sheet. In the three-dimensional molded container 101 according to the first embodiment, it is preferable to further fix the non-heat-shrinkable film 22 to the bottom surface 11.

  Examples of the method for fixing the mount 10 and the film unit 20 include a method of fixing by welding such as ultrasonic welding, high-frequency welding, and thermal welding, and a method of fixing using auxiliary materials such as an adhesive and an adhesive tape. In the three-dimensionally molded container 101 according to the first embodiment, it is fixed over the entire width of the upper end 12a of the side piece 12, but it may be fixed locally. Moreover, a fixed pattern is not specifically limited, For example, it is good also as a dot form other than a line form. Further, a laminate of a paper material and a heat-sealable plastic is used as the mount 10, and the outermost layer on the side fixed to the mount 10 of the film unit 20 is made of the same material as the plastic of the laminate of the mount 10. It is preferable in that it can be easily welded and fixed. A laminate of a paper material and a heat-sealable plastic is, for example, milk carton paper.

(Filling process)
From the open side of the blank sheet, the article 1 can be filled and sealed to obtain a planar three-dimensionally molded container 101. The sealing is preferably performed in a vacuum state or a deaerated state. The expansion or rupture of the container due to the increase of the internal pressure in the container due to heating can be prevented. Moreover, the deterioration by the oxidation of the to-be-packaged object 1 can be prevented.

  As another form of the method for producing the three-dimensionally molded container according to the first embodiment, a filling and packaging machine is used to supply the heat-shrinkable film 21 and the non-heat-shrinkable film 22 and heat-seal the periphery to be wrapped. There is a method of filling the product 1 to form the film part 20 and then fixing the film part 20 to the mount 10 to obtain the three-dimensionally molded container 101.

  Next, an example of a method for using the three-dimensional molded container according to the present invention will be described.

  A user heats a planar solid molded container. Then, with the shrinkage of the heat shrink film, the side piece rises and becomes a three-dimensional shape. The heating means only needs to be able to shrink the heat-shrinkable film, and examples thereof include hot air, infrared rays, hot water immersion, hot water shower, and water vapor. Or when the to-be packaged object 1 is a substance containing water, such as a foodstuff, it is preferable that it is the heating by a microwave oven. Moreover, when the to-be packaged object 1 is a foodstuff, heating or cooking and three-dimensional shaping can be performed at the same time, which is efficient. The heating temperature varies depending on the shrinkage temperature of the heat-shrinkable film, but is preferably 60 to 130 ° C. More preferably, it is 80-120 degreeC.

  In the three-dimensionally molded container according to the eighth embodiment and its modification, the susceptor function can be further validated by heating using a microwave oven. When heated in a microwave oven, first, the metal vapor deposition part absorbs microwaves and generates induction heat. Then, the temperature of the metal vapor deposition part becomes higher (about 200 ° C.) than when the metal vapor deposition part is not provided, and the surface of the packaged object in contact with the metal vapor deposition part may be burnt, burnt, or crisp. it can.

  After the three-dimensional molding, the user opens the film part. The method of opening a film part is not specifically limited, For example, the method of using cutting means, such as a cutter, and the method of opening by providing the said opening means in a film part. When the film part including 1st embodiment is a bag shape, it is preferable to cut | disconnect and open only the film which forms the top | upper surface of a three-dimensional molded container. The cutting position is not particularly limited, and is, for example, an I shape, an X shape, or the entire circumference along the periphery of the top surface.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not construed as being limited to the examples.

Example 1
A three-dimensional molded container 101 according to the first embodiment shown in FIG. 1 was produced. Here, a milk carton paper having a thickness of 0.5 mm in which low density polyethylene (LDPE) was melt-extruded and laminated on both sides of a paper board having a basis weight of about 375 g / m ² was used as the mount 10. The size of the bottom surface 11 was 7 cm × 10 cm. The distance from the crease 13 of the side piece 12 to the upper end side of the side piece 12 was 3 cm. Furthermore, as the heat shrink film 21, a 3 μm ultra-low density polyethylene layer (VLDPE), a 22 μm ethylene-vinyl acetate copolymer layer (EVA1), a 7 μm vinylidene chloride layer (PVDC), and a 12 μm ethylene-acetic acid layer. A multilayer film (trade name: MLB-1000, manufactured by Kureha Co., Ltd.) obtained by co-extruding a vinyl copolymer layer (EVA2) and a 10 μm ionomer layer (IO) was used. Further, as the non-heat-shrinkable film 22, a 31 μm polyethylene single layer film (PE) was used. Here, the area (Sb) when the film part 20 is viewed from the front is 172 cm ² , the area heat shrinkage rate (Ra) of the heat shrink film 21 is 0.75, and the area Sp of the container opening 15 is 70 cm ² . Sa / Sp = 0.61.

  The IO of the heat-shrinkable film 21 and the PE of the non-heat-shrinkable film 22 were faced and overlapped, and the periphery was heat-sealed leaving an open side to form a bag. The bag was fixed by heat sealing at the upper end 12a of the side piece 12 in a state where the non-heat-shrinkable film 22 was placed on the mount side to obtain a blank sheet. As an article to be packaged 1 from the opening side of the blank sheet, 20 g of a cone was filled and sealed to obtain a flat three-dimensional molded container.

(Example 2)
A planar solid molded container was obtained in the same manner as in Example 1 except that the modification 101a of the solid molded container according to the first embodiment shown in FIG.

(Example 3)
A flat three-dimensional molded container was obtained in the same manner as in Example 1 except that the modified example 106 of the three-dimensional molded container according to the sixth embodiment shown in FIG. 9 was used.

Example 4
A planar three-dimensionally molded container was obtained in the same manner as in Example 1, except that the modified example 105 of the three-dimensionally molded container according to the fifth embodiment shown in FIG.

  Three-dimensional molded containers 101, 101a, 106, and 105 of Examples 1 to 4 are heated at 500 W for 30 seconds using a microwave oven (manufactured by Toshiba Corporation, microwave oven ER-AS7 (W)), and are being heated. And the state after three-dimensional molding was confirmed. Further, as a further evaluation, the three-dimensional molded container 101 of Example 1 was used and heated at 500 W for 60 seconds, and the state after the three-dimensional molding when the heating time was exceeded was confirmed.

  In the three-dimensional molded containers 101, 101a, 106, and 105 of Examples 1 to 4, the side pieces stood up and became three-dimensional by heating. Since the three-dimensionally molded containers 106 and 105 of Example 3 and Example 4 fixed the film part 20 at the side end 12b of the side piece 12, the side pieces are three-dimensionalized while standing apart from each other by heating. As shown in FIG. 8 (b), it expanded into a dome shape. The state of the three-dimensional molded containers 106 and 105 after the three-dimensional molding was more distorted than the three-dimensional molded container 101 of Example 1. Further, the three-dimensional molded containers 106 and 105 after the three-dimensional molding had a smaller internal volume than the three-dimensional molded container 101 of Example 1. Furthermore, in Example 4, as indicated by reference numeral 8 in FIG. 8B, the unshrinked film portion protruded from the mount, and the appearance was poor. The three-dimensional molded containers 101 and 101a of Example 1 and Example 2 were three-dimensionalized while all the side pieces 12 stood up simultaneously by heating. The state of the three-dimensional molded containers 101 and 101a after the three-dimensional molding was a well-balanced rectangular parallelepiped. When Example 1 was compared with Example 2, Example 1 had a larger internal volume. Moreover, the three-dimensionally molded container 101 of Example 1 after heating at 500 W for 60 seconds held a well-balanced rectangular parallelepiped.

  Next, the three-dimensional molded container provided with the susceptor function was evaluated for verifying the susceptor function.

(Example 5)
A three-dimensional molded container according to the eighth embodiment was produced. The shape of the three-dimensional molded container is the same as that of the three-dimensional molded container 101 according to the first embodiment shown in FIG. As the mount 10, a mount similar to the mount used in Example 1 was used. First, a 31 μm PE single layer film was fixed to the mount 10 as the non-heat-shrinkable film 22. Next, on the surface of the non-heat-shrinkable film 22 on the heat-shrinkable film 21 side and at a position corresponding to the bottom surface 11, aluminum is formed on one side of a 12 μm-thick polyethylene terephthalate (PET) film as a microwave heating film. Using an aluminum-deposited PET film (size 7 cm x 12 cm) deposited by vacuum deposition method with a double-sided tape (trade name: Recycled Paper Double-sided Tape Nystack, manufactured by Nichiban Co., Ltd.) with the PET side facing the non-heat-shrinkable film 22 Fixed. Then, 2 μm copolymer polyethylene terephthalate (COPET), 10 μm 6-66 nylon (6-66Ny), 4.6 μm ethylene-vinyl alcohol copolymer (EVOH), and 19. LLDPE of a multilayer film (trade name VS-20, manufactured by Kureha Co.) coextruded with 1 μm linear low density polyethylene (LLDPE) is laminated with the non-heat-shrinkable film 22 facing each other, leaving an open side and surroundings Was heat sealed to obtain a blank sheet. From the opening side of the blank sheet, the package 1 is filled with (A) French toast (a mixture of egg and sugar mixed in bread), (B) bread with butter or (C) hot cake, respectively. Then, the flat three-dimensional molded container of Example 5A to Example 5C was obtained.

  The three-dimensionally molded containers of Examples 5A to 5C were three-dimensionally molded by heating at 500 W for 1 minute using a microwave oven (manufactured by Toshiba Corporation, microwave oven ER-AS7 (W)). At this time, the state during heating and the state of the package 1 after heating were confirmed. Further, as a control group, a blank sheet was prepared in Example 5 without providing a microwave heating film, and the three-dimensionally molded containers filled and sealed with the ingredients (A) to (C) were similarly tested.

  In each of the three-dimensionally molded containers of Examples 5A to 5C, the side piece stood up without any occurrence of sparks during heating and became a uniform rectangular parallelepiped. And as for the to-be-packaged object 1 heated in the three-dimensional molded container of Examples 5A-5C, the burnt eyes were formed in the part which was contacting the metal vapor deposition part. On the other hand, no burns were formed on the package 1 in the control group. From the above, it was confirmed that it has a susceptor function.

  The three-dimensional molded container according to the present invention is suitable as a container for fresh food, cooked or semi-cooked food, screws, bolts, nuts, buttons, beads, and the like.

DESCRIPTION OF SYMBOLS 1 Packaged object 4 Connection piece 10, 10d Mount 11 Bottom face 12 Side piece 12a Side piece upper end 12b Side piece side end 13 Folding line 14 Folding line 15 Container opening part 16 Space 20, 20a, 20b, 20c, 20d Film part 21 heat-shrinkable film 21a upper heat-shrinkable film 21b lower heat-shrinkable film 22 non-heat-shrinkable film 101 three-dimensional molded container 101a according to the first embodiment three-dimensional molded container 102 according to the first embodiment, three-dimensional according to the second embodiment Molded Container 103 Solid Molded Container 104 According to Third Embodiment Solid Molded Container 105 According to Fourth Embodiment Solid Molded Container 106 according to Fifth Embodiment Solid Molded Container 107 According to Sixth Embodiment Solid according to Seventh Embodiment Molded container

Claims (10)

A mount having a bottom surface and side pieces connected to at least one side of the bottom surface via a crease;
Having at least one heat-shrink film, and at least an upper end of the side piece, and a film portion fixed in a state of being superimposed on the mount,
The three-dimensionally molded container is characterized in that the side piece rises as the heat-shrinkable film shrinks.   The said side piece is provided in all the sides of the said bottom face, The three-dimensional molded container of Claim 1 characterized by the above-mentioned. The film part is a bag shape formed by stacking a heat shrink film and a non-heat shrink film, and welding the periphery.
The three-dimensionally molded container according to claim 1 or 2, wherein the non-heat-shrinkable film is fixed so as to be on the mount side. The film part is a bag shape formed by stacking a heat shrink film and a non-heat shrink film, and welding the periphery.
The three-dimensional molded container according to claim 1 or 2, wherein the heat shrink film is fixed so as to be on the mount side.   The three-dimensional molded container according to claim 1 or 2, wherein the film part is a bag shape formed by overlapping a heat shrink film and a heat shrink film and welding the periphery.   The three-dimensional molded container according to any one of claims 3 to 5, wherein the film portions are overlapped across the side edges of the side pieces adjacent to each other.   The three-dimensionally molded container according to any one of claims 1 to 6, wherein the film portion is not fixed at a side end of the side piece. A container formed after the side piece stands up with Sa being the area of the film part after shrinkage calculated from the area (Sb) when the film part is viewed from the front and the area shrinkage rate (Ra) due to heating of the heat shrinkable film The three-dimensional molded container according to any one of claims 1 to 7, wherein the area of the opening is Sp, and the area ratio (Sa / Sp) satisfies Formula 1.
(Equation 1) Sa / Sp = Sb × (1-Ra) /Sp=0.50-1.90   5. The three-dimensionally molded container according to claim 3, wherein a surface of the non-heat-shrinkable film on the heat-shrinkable film side has a metal vapor deposition portion.   The three-dimensionally molded container according to claim 1, further comprising a microwave heating film having a metal vapor deposition portion provided on the surface of the non-heat-shrinkable film, inside the three-dimensionally molded container.

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