JP6187850B2 - Sheet forming tray and food tray - Google Patents

Description

  The present invention relates to a sheet forming tray and a food containing tray in which food is stored and the stored food is cooked and sterilized.

  In recent years, a food material is filled in a tray-shaped container, a lid material is sealed and sealed in the container, and then the food material is cooked and sterilized by using a microwave. In this case, a check valve is attached to the lid, and the check valve has a structure for releasing air and steam in the container when the pressure in the container becomes high in order to prevent the container from bursting. . When the food material in the container is heated, the check valve is closed and the inside of the container is depressurized.

Japanese Utility Model Publication No. 1-179881 Japanese Utility Model Publication No. 4-42116 JP-A-8-133345 JP 2011-42385 A

  By the way, when the inside of the container is depressurized in this way, the container is deformed inward. However, when a conventionally known container (for example, see Patent Documents 1 to 4) is used as such a container, when the inside of the container is depressurized, the side portion of the container is greatly deformed, and the appearance is improved. May get worse.

  In particular, when a food material containing a large number of grains such as cooked rice is used, a large number of gaps exist between the grains, so that the container is greatly deformed during decompression. When the inside of the container is greatly depressurized in this way, local deformation (smashing) occurs at the periphery of the bottom, and in some cases, the bottom of the container is damaged during transportation.

  The present invention has been made in consideration of such points, and even when the inside is depressurized, the side portion is not deformed, the appearance can be maintained well, and the bottom portion can be maintained. An object of the present invention is to provide a sheet forming tray and a food containing tray capable of preventing local deformation at the periphery.

  The present invention relates to a sheet forming tray that is used when food is stored and the stored food is cooked and sterilized, and includes a side portion, a bottom portion connected to the side portion, and a flange provided around the side portion. The bottom part has a central bottom part and a peripheral bottom part located on the peripheral edge of the central bottom part. The central bottom part is composed of a polygonal panel, and each polygonal panel is arranged between the polygonal panel and the peripheral bottom part. The sheet forming tray is characterized in that a rectangular panel provided corresponding to the side is provided, and an inclined wall is provided along the outer periphery of the peripheral bottom.

  The present invention is the sheet forming tray characterized in that the bottom portion has an elliptical shape.

  The present invention is the sheet forming tray characterized in that the peripheral bottom is thinner than the side.

  The present invention is the sheet forming tray, wherein the polygonal panel is an octagonal panel.

  The present invention is the sheet forming tray, wherein the inclined wall has an elliptical ring shape.

  The present invention is the sheet forming tray characterized in that the center bottom and the peripheral bottom are substantially parallel.

  The present invention is a food containing tray comprising a sheet forming tray, a food stored in the sheet forming tray, and a lid member welded to a flange portion of the sheet forming tray.

  According to the present invention, since the bottom part has a shape that is more easily deformed than the side part, the side part is not deformed when the inside of the sheet forming tray is decompressed, and the appearance can be favorably maintained. .

  Further, according to the present invention, the central bottom portion is formed of a polygonal panel, and a rectangular panel provided corresponding to each side of the polygonal panel is provided between the polygonal panel and the peripheral bottom portion. An inclined wall is provided along the outer periphery. Thus, when the inside of the sheet forming tray is depressurized, it is possible to prevent local deformation from occurring at the periphery of the bottom.

FIG. 1 is a perspective view showing a sheet forming tray and a lid according to an embodiment of the present invention. FIG. 2 is a plan view showing a sheet forming tray according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional view showing a sheet forming tray according to one embodiment of the present invention (cross-sectional view taken along section line III-III in FIG. 2). FIG. 4 is a partial cross-sectional view showing a sheet forming tray according to an embodiment of the present invention (cross-sectional view taken along section line IV-IV in FIG. 2). FIG. 5 is a bottom view showing a sheet forming tray according to an embodiment of the present invention. FIG. 6 is a schematic view showing a process for producing a food-containing tray using a sheet forming tray. FIG. 7 is a perspective view seen from the bottom side showing a sheet forming tray according to an embodiment of the present invention when the inside is decompressed. FIGS. 8A to 8D are schematic views illustrating a process of cooking a food containing tray. FIG. 9 is a plan view showing a sheet forming tray according to a comparative example. FIG. 10 is a partial cross-sectional view showing a sheet forming tray according to a comparative example (cross-sectional view taken along a cutting line XX in FIG. 9). FIG. 11 is a perspective view of a sheet forming tray according to a comparative example viewed from the bottom when the inside is depressurized.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 are views showing an embodiment of the present invention.

  First, an outline of a sheet forming tray according to the present embodiment will be described with reference to FIGS.

  The sheet forming tray 10 shown in FIGS. 1 to 5 is used when the food 16 is stored and the stored food 16 is cooked and sterilized as will be described later. Such a sheet forming tray 10 includes a side portion 11, a bottom portion 20 connected to the lower side of the side portion 11, and a flange portion 30 provided around the upper side of the side portion 11.

  Among these, the side part 11 has a substantially elliptical horizontal cross section, and its area gradually decreases from the flange part 30 side (upper side) toward the bottom part 20 side (lower side).

  The flange portion 30 includes a flange peripheral portion 31 located at the periphery of the side portion 11 and two grip portions 32 that extend horizontally from the side portion 11 toward the container outer side and are gripped by the user during eating. Yes. Of these, the grip portion 32 is formed with a concave portion 33 having a substantially planar arc shape. The recess 33 is provided to make it difficult for the heat to be transmitted to the finger when the user carries the cooked sheet forming tray 10.

  Moreover, the bottom part 20 has a plane substantially elliptical shape (long elliptical shape). The bottom portion 20 has a shape that can be easily deformed from the side portion 11, and has a central bottom portion 21 located at the center and a peripheral bottom portion 22 located at the periphery of the central bottom portion 21.

  Among these, the center bottom part 21 consists of the polygon panel 21a, and consists of a substantially flat surface. Further, the peripheral bottom portion 22 is formed of a substantially flat surface and is disposed substantially parallel to the central bottom portion 21. Further, a plurality of rectangular panels 23 provided corresponding to the respective sides 21b of the polygon panel 21a are provided between the polygon panel 21a and the peripheral bottom portion 22. Thus, by providing the rectangular panel 23 corresponding to each side 21b of the polygon panel 21a, the bottom 20 can be easily deformed and the deformation of the bottom 20 can be made inconspicuous. .

  The polygonal panel 21a has a horizontally long octagonal shape, and is composed of an octagonal panel that is line symmetric with respect to the vertical and horizontal central axes. On the other hand, each square panel 23 has a substantially trapezoidal shape, and its bottom side 23a is connected to each side 21b of the octagonal panel. Eight rectangular panels 23 are provided corresponding to the sides 21b of the polygon panel 21a.

  At least before the sheet forming tray 10 is deformed, the quadrangular panel 23 is inclined with respect to the central bottom portion 21 (polygonal panel 21a), and the peripheral bottom portion 22 is inclined with respect to the quadrangular panel 23. Is provided. As shown in FIG. 3, in the vertical cross section along the longitudinal direction of the sheet forming tray 10, the angle α <b> 1 formed by the center bottom portion 21 (polygonal panel 21 a) and the square panel 23 can be 20 ° to 30 °. .

  The polygonal panel 21a is not limited to an octagonal panel, but is most preferably an octagonal panel. When the polygonal panel 21a is an octagonal panel, the effect of preventing local deformation in the periphery of the bottom 20 can be most reliably obtained. Further, the apexes of the polygonal panel 21a and the quadrangular panel 23 may be sharp, but if they are slightly rounded, the conveyance strength and the drop strength of the sheet forming tray 10 increase.

  An inclined wall 24 is provided along the outer periphery of the peripheral bottom portion 22. The inclined wall 24 is connected to the lower end portion 11 a of the side portion 11 and extends in the entire circumferential direction along the outer periphery of the peripheral bottom portion 22. The inclined wall 24 has a substantially elliptical ring shape, and its width is substantially constant over the entire circumference.

  At least before the sheet forming tray 10 is deformed, the inclined wall 24 is inclined with respect to both the side portion 11 and the peripheral bottom portion 22 in the vertical cross section (see FIGS. 3 and 4). Specifically, the angle α2 (see FIG. 3) formed by the inclined wall 24 and the horizontal plane (the center bottom portion 21 and the peripheral bottom portion 22) can be set to 30 ° to 60 °.

  Such a sheet forming tray 10 has a single layer sheet such as a thermoplastic resin such as PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) or a barrier layer such as EVOH or nylon. It is produced by molding (sheet molding) a multilayer sheet including the same.

  The peripheral bottom portion 22 of the sheet forming tray 10 is thinner than the side portion 11. In particular, when the thickness of the side portion 11 is t1, and the thickness of the peripheral bottom portion 22 is t2 (see FIG. 3), it is preferable that 0.05 mm <t1-t2 <0.3 mm. Thus, by making the peripheral bottom portion 22 of the sheet forming tray 10 thinner than the side portion 11, the bottom portion 20 is more easily deformed than the side portion 11, and the side portion is reduced when the inside of the sheet forming tray 10 is decompressed. 11 can be reliably prevented from being deformed.

  By the way, the foodstuff 16 (refer FIG. 6) is accommodated in the sheet forming tray 10, and after that, the cover material (cover film) 40 (refer FIG. 1) is welded to the flange part 30, and the sheet forming tray 10 is sealed. Such a lid member 40 is made of, for example, PE (polyethylene) or PP (polypropylene), and a check valve means 41 is provided, for example, in a substantially central portion. When the inside of the sheet forming tray 10 is pressurized, the check valve means 41 can escape air and steam inside the sheet forming tray 10 but does not allow external air to flow into the sheet forming tray 10. . In addition, since a conventionally well-known thing can be used as the check valve means 41, detailed description is abbreviate | omitted here.

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS.

  FIG. 6 shows a process of producing the food containing tray 15 using the sheet forming tray 10. In FIG. 6, the code | symbol 50 has shown the food containing tray manufacturing apparatus which produces the food containing tray 15. FIG. The food containing tray manufacturing apparatus 50 includes a tray supply device 51, a filling device 53, a check valve supply device 54, a heating device 55, and a cooling device 56 in order from the upstream side. Further, the food containing tray manufacturing apparatus 50 has a transport device 52 formed of a conveyor or the like, and the sheet forming tray 10 is transported by the transport device 52.

  In FIG. 6, first, the empty sheet forming tray 10 is supplied from the tray supply device 51 to the transport device 52.

  Subsequently, the food product 16 is filled into the sheet forming tray 10 by a filling device 53 provided on the downstream side of the tray supply device 51. At this time, the food 16 is filled with a raw material, a semi-cooked material, or a blended material. Note that the filling device 53 may sequentially fill a plurality of types of materials.

  On the other hand, a check valve supply device 54 is provided in the vicinity of the conveying device 52, and the check valve means 41 is attached to the lid member 40 in the check valve supply device 54.

  Thereafter, the lid member 40 to which the check valve means 41 is attached is welded to the sheet forming tray 10 that has flowed on the conveying device 52 by, for example, heat sealing, and the sheet forming tray 10 filled with the food 16 is formed. Sealed.

  Subsequently, the sheet forming tray 10 sealed by the lid member 40 is conveyed into a heating device 55 provided on the downstream side of the filling device 53. The heating device 55 is composed of, for example, a microwave heating device, and plays the role of cooking the food 16 in the sheet forming tray 10 and sterilizing the food 16.

  In the heating device 55, the food 16 in the sheet forming tray 10 is cooked and sterilized. At this time, the pressure in the sheet forming tray 10 is increased, and the lid member 40 swells upward. When the inside of the sheet forming tray 10 reaches a predetermined pressure, water vapor and air generated from the food 16 are discharged from the check valve means 41 to the outside. After the water vapor and air are released, the pressure in the sheet forming tray 10 decreases, the check valve means 41 is closed, and the lid member 40 is returned downward.

  After the food 16 has been heated and sterilized in this way, the sheet forming tray 10 leaves the heating device 55 and is conveyed to the cooling device 56. During this conveyance, the inside of the sheet forming tray 10 is depressurized. In the cooling device 56, the sheet forming tray 10 containing the food 16 is cooled to 0 to 10 ° C.

  After being cooled in the cooling device 56, the sheet forming tray 10 is unloaded from the cooling device 56. In this way, the food containing tray 15 including the sheet forming tray 10, the food 16 stored in the sheet forming tray 10, and the lid member 40 welded to the flange portion 30 of the sheet forming tray 10 is obtained. .

  By the way, in this Embodiment, as mentioned above, the bottom part 20 of the sheet forming tray 10 has the center bottom part 21 and the periphery bottom part 22 located in the center bottom part 21 periphery. Moreover, the center bottom part 21 consists of the polygon panel 21a, and the rectangular panel 23 provided corresponding to each edge | side 21b of the polygon panel 21a between the polygon panel 21a and the peripheral bottom part 22 is provided. Further, a substantially elliptical inclined wall 24 is provided along the outer periphery of the peripheral bottom portion 22.

  As a result, when the inside of the sheet forming tray 10 is depressurized, the bottom 20 is recessed toward the inside of the sheet forming tray 10 and the center bottom 21 is inverted into the sheet forming tray 10 (FIG. 3). Imaginary line and FIG. 7). On the other hand, since the side part 11 does not deform | transform, deformation | transformation of the bottom part 20 does not stand out seeing from the outside. Further, at this time, the inclined wall 24 is deformed in a direction substantially parallel to the ground plane, but is deformed uniformly in the circumferential direction, so that no local deformation occurs in the peripheral edge of the bottom portion 20. Further, when the central bottom 21 is inverted into the sheet forming tray 10, the inclined wall 24 becomes a grounding portion, so that the sheet forming tray 10 is not unstable and can be stably grounded.

  Further, since the peripheral bottom portion 22 of the sheet forming tray 10 is thinner than the side portion 11, the bottom portion 20 can be reliably recessed inward of the sheet forming tray 10 without deforming the side portion 11.

  Next, the action when the user cooks the food containing tray 15 thus prepared at the time of eating will be described. 8A to 8D show a process of cooking the food containing tray 15.

  As shown in FIG. 8A, the food containing tray 15 is placed in a cooking device 60 such as a microwave oven and heated. At this time, the pressure in the sheet forming tray 10 is increased, the lid member 40 expands upward, and water vapor and air are released from the check valve means 41 (FIG. 8B). At this time, a sound may be generated from the check valve means 41.

  After the heating is completed, the food containing tray 15 is taken out from the cooking device 60. Subsequently, the food containing tray 15 is naturally cooled, the pressure inside the sheet forming tray 10 is reduced again, and the lid 40 is recessed downward (FIG. 8C). Then, the foodstuff 16 in the sheet | seat molding tray 10 can be eaten by peeling the cover material 40 from the flange part 30 (FIG.8 (d)).

  As described above, according to the present embodiment, since the bottom portion 20 has a shape that is more easily deformed than the side portion 11, when the pressure inside the sheet forming tray 10 is reduced, the bottom portion 20 is inward of the sheet forming tray 10. The side portion 11 is not deformed. Thus, the appearance of the food containing tray 15 can be maintained satisfactorily.

  Further, since the inclined wall 24 is provided along the outer periphery of the peripheral bottom portion 22, no local force is applied to the peripheral edge of the bottom portion 20 when the inside of the sheet forming tray 10 is decompressed, and the bottom portion 20. It is possible to prevent local deformation from occurring at the periphery of the. In particular, in the present embodiment, since the bottom portion 20 has an elliptical shape, no stress is evenly applied to the periphery of the bottom portion 20. Even in this case, since the inclined wall 24 is provided, local deformation does not occur in the periphery of the bottom portion 20.

  The food 16 stored in the sheet forming tray 10 is not limited to this, and examples thereof include lasagna, penne, paella, and pasta. In particular, when the food 16 includes a lot of grains (rice cooked rice) such as jambalaya, the inside of the sheet forming tray 10 is greatly decompressed due to the presence of voids between the grains. Even in this case, the above configuration can surely prevent local deformation from occurring at the periphery of the bottom portion 20.

Comparative Example Next, a comparative example of the present invention will be described with reference to FIGS.

  A sheet forming tray 100 (comparative example) shown in FIGS. 9 and 10 includes a side portion 101, a bottom portion 102, and a flange portion 103. Among these, the bottom part 102 has an elliptical central bottom part 104 and an elliptical inclined part 105 located on the periphery of the central bottom part 104. The inclined portion 105 is directly connected to the lower end of the side portion 101.

  When the inside of such a sheet forming tray 100 (comparative example) is depressurized, for example, through the above-described process (see FIG. 6), the bottom 102 is reversed toward the inside of the sheet forming tray 10. FIG. 11 shows the state of the sheet forming tray 100 at this time. In this case, since the elliptical central bottom portion 104 and the inclined portion 105 are not uniformly deformed in the circumferential direction, the bottom portion 102 is deformed so as to wave, and a local deformation occurs in the peripheral edge 106 of the bottom portion 102.

  On the other hand, in the present embodiment, as described above, the central bottom portion 21 is composed of the polygon panel 21a, the rectangular panel 23 is provided between the polygon panel 21a and the peripheral bottom portion 22, and the peripheral bottom portion 22 An inclined wall 24 is provided along the outer periphery. Thereby, it can prevent that a local deformation | transformation arises in the periphery of the bottom part 20 (refer FIG. 7).

DESCRIPTION OF SYMBOLS 10 Sheet forming tray 11 Side part 15 Food tray 16 Food 20 Bottom part 21 Center bottom part 21a Polygon panel 22 Periphery bottom part 23 Square panel 24 Inclined wall 30 Flange part 31 Flange peripheral part 32 Gripping part 33 Concave part 40 Cover material 41 Check valve means

Claims (6)

In the sheet molding tray used when food is stored and the stored food is cooked and sterilized,
Side,
A bottom connected to the side,
A flange portion provided around the side portion,
The bottom has a central bottom and a peripheral bottom located on the peripheral edge of the central bottom,
The center bottom is formed of a polygon panel, and a rectangular panel provided corresponding to each side of the polygon panel is provided between the polygon panel and the peripheral bottom.
An inclined wall is provided along the outer periphery of the peripheral bottom , and the inclined wall has an elliptical ring shape .   The sheet forming tray according to claim 1, wherein the bottom portion has an elliptical shape.   The sheet forming tray according to claim 1 or 2, wherein the peripheral bottom portion is thinner than the side portion.   The sheet forming tray according to any one of claims 1 to 3, wherein the polygonal panel comprises an octagonal panel. The sheet forming tray according to any one of claims 1 to 4 , wherein the center bottom portion and the peripheral bottom portion are substantially parallel to each other. A sheet forming tray according to any one of claims 1 to 5 ,
Food stored in a sheet forming tray;
A food containing tray comprising a lid member welded to a flange portion of a sheet forming tray.

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