WO2015170429A1

WO2015170429A1 - Sheet-formed container and food container

Info

Publication number: WO2015170429A1
Application number: PCT/JP2014/082434
Authority: WO
Inventors: 恒相澤; 一成清水; 浩子堀
Original assignee: 大日本印刷株式会社
Priority date: 2014-05-09
Filing date: 2014-12-08
Publication date: 2015-11-12
Also published as: KR102115824B1; KR20170005749A; JP6388194B2; SG11201609279WA; JP2015214354A

Abstract

A sheet-formed container (10) comprises a side section (11), a bottom section (20) connected to the side section (11), and a flange section (30) provided on the periphery of the side section (11). The bottom section (20) has a bottom section deformation facilitating means (25) that facilitates deformation of the bottom section (20) when pressure decreases inside the sheet-formed container (10). The side section (11) has a side section deformation preventing means (12) that prevents deformation of the side section (11) when pressure decreases inside the sheet-formed container (10).

Description

Sheet forming tray and food tray

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.

Recently, after filling a tray-shaped container with a food material and sealing the container with a lid, the food material is cooked and sterilized by using microwaves. 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 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 part of the container is greatly deformed, so that the appearance is improved. May get worse.

In particular, in the above container, when the thickness of the container is reduced in order to reduce the material of the container, there arises a problem that the deformation of the side portion becomes more remarkable.

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 provides a sheet forming tray for storing food and used when the stored food is cooked and sterilized, and is provided around a side part, a bottom part connected to the side part, and the side part. The bottom portion includes bottom portion deformation promoting means for accelerating deformation of the bottom portion when the inside of the sheet forming tray is decompressed, and the side portion is decompressed inside the sheet forming tray. A sheet forming tray having side part deformation preventing means for preventing the side part from being deformed.

The present invention is the sheet forming tray, wherein the side deformation preventing means includes a reinforcing rib.

The present invention is the sheet forming tray, wherein the reinforcing rib is provided in parallel to a plane on which the sheet forming tray is placed.

The present invention is the sheet forming tray, wherein the reinforcing rib is provided over the entire circumference of the side portion.

The present invention is the sheet forming tray characterized in that the thickness of the side portion is 0.35 mm to 0.40 mm.

In the present invention, the bottom portion deformation promoting means of the bottom portion has a central bottom portion and a peripheral bottom portion located on the peripheral edge of the central bottom portion, and the central bottom portion includes a polygon panel, and the polygon panel and the peripheral bottom portion A rectangular panel provided corresponding to each side of the polygon panel, and an inclined wall is provided along the outer periphery of the peripheral bottom portion. .

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

According to the present invention, the bottom portion has a bottom portion deformation promoting means for promoting the deformation of the bottom portion, and the side portion has a side portion deformation preventing means for preventing the side portion from being deformed. As a result, the bottom part is more easily deformed than the side part, so even if the sheet forming tray is thinned, the side part will not be deformed when the inside of the sheet forming tray is decompressed. The appearance can be maintained well.

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 an 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 (a 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 showing a process of cooking a food containing tray. FIG. 9 is a plan view showing a sheet forming tray according to a modification. FIG. 10 is a plan view showing a sheet forming tray according to a modification. FIG. 11 is a plan view showing a sheet forming tray according to a modification.

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 as will be described later, and the stored food 16 is sterilized by cooking. 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.

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

The side part 11 has side part deformation preventing means 12 for preventing the side part 11 from being deformed when the inside of the sheet forming tray 10 is depressurized. In this case, the side portion deformation preventing means 12 includes a plurality (five) of convex reinforcing ribs 13 protruding from the inside of the sheet forming tray 10 toward the side. Valleys 14 are formed between the reinforcing ribs 13, respectively.

The side portion 11 has a shape in which reinforcing ribs 13 and valley portions 14 are alternately arranged over the entire vertical direction. Thereby, intensity | strength is raised over the up-down direction whole region of the side part 11, and it becomes easy to prevent the side part 11 from deform | transforming.

3 and 4, each reinforcing rib 13 has a curved shape such as an arc shape or an elliptical arc shape in a vertical section. The radius of curvature of each reinforcing rib 13 may be, for example, 10 mm to 15 mm. In this case, the cross-sectional shapes of the five reinforcing ribs 13 are substantially the same as each other, but the present invention is not limited to this, and the five reinforcing ribs 13 may have different cross-sectional shapes.

In the present embodiment, the heights h (see FIG. 3) of the five reinforcing ribs 13 are substantially the same, but not limited to this, even if the reinforcing ribs 13 have different heights h. good. The reinforcing ribs 13 are provided in parallel to a plane (a center bottom portion 21 described later) on which the sheet forming tray 10 is placed. However, the present invention is not limited to this, and the reinforcing ribs 13 may extend in the vertical direction, or may extend obliquely with respect to the plane.

Furthermore, in this embodiment, each reinforcing rib 13 is provided over the entire circumference of the side portion 11. Thereby, a force does not concentrate on the specific part of the side part 11, but the intensity | strength is raised over the circumferential direction whole region of the side part 11, and it can make it easy to prevent a deformation | transformation. However, the present invention is not limited thereto, and there may be a region where the reinforcing ribs 13 are not formed in a part of the circumferential direction.

Further, the thickness t1 of the side portion 11 (thickness in the reinforcing rib 13) (see FIG. 3) is preferably 0.35 mm to 0.40 mm. Thus, by reducing the thickness t1 of the side part 11, the material of the sheet forming tray 10 can be reduced, and the manufacturing cost of the sheet forming tray 10 can be reduced. Even in this case, since the reinforcing ribs 13 are formed on the side portions 11, it is possible to prevent the side portions 11 from being deformed when the inside of the sheet forming tray 10 is decompressed.

In FIG. 1 to FIG. 5, the flange portion 30 includes a flange peripheral portion 31 located at the peripheral edge of the side portion 11, and extends horizontally from the side portion 11 toward the outer side of the container and is gripped by the user during eating. The grip part 32 is included. 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.

Further, the bottom portion 20 has a plane substantially elliptical shape (long elliptical shape). The bottom portion 20 includes bottom portion deformation promoting means 25 that promotes deformation of the bottom portion 20 when the inside of the sheet forming tray 10 is depressurized. Thereby, the bottom part 20 can be more easily deformed than the side part 11 having the side part preventing means 12. The bottom portion deformation promoting means 25 of the bottom portion 20 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 longitudinal and lateral 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 α1 formed by the center bottom portion 21 (polygonal panel 21a) 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.

Further, 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.

In addition, 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, an angle α2 (see FIG. 3) formed by the inclined wall 24 and the horizontal plane (the central bottom portion 21 and the peripheral bottom portion 22) can be set to 30 ° to 60 °.

Such a sheet molding tray 10 is a single layer sheet such as a thermoplastic resin such as PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), EVOH, nylon (registered trademark), or the like. This is produced by molding (sheet molding) a multilayer sheet including the barrier layer. For example, when the sheet forming tray 10 is produced, a heated plate-like multilayer sheet is placed on a female mold, the multilayer sheet is pushed into the female mold to a certain extent using a plug, and then vacuumed. It may be molded.

Further, the thickness t2 of the central bottom portion 21 is, for example, 0.35 to 0.50 mm, and the thickness t3 of the flange portion 30 is, for example, 0.5 mm to 1.0 mm (see FIG. 3).

Incidentally, the food molding 16 (see FIG. 6) is stored in the sheet molding tray 10, and then the lid member (lid film) 40 (see FIG. 1) is welded to the flange portion 30 to seal the sheet molding tray 10. 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.

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

Subsequently, the sheet forming tray 10 is filled with the food 16 by the 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 exits 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 above-mentioned, the side part 11 of the sheet forming tray 10 has the side part deformation | transformation prevention means 12, and this side part deformation | transformation prevention means 12 contains the some reinforcement rib 13. FIG. Yes. Thereby, since the strength of the side portion 11 is sufficiently maintained, the side portion 11 is not recessed toward the inside of the sheet forming tray 10 when the inside of the sheet forming tray 10 is depressurized.

In the present embodiment, as described above, the bottom portion 20 of the sheet forming tray 10 includes the bottom portion deformation promoting means 25, and the bottom portion deformation promoting means 25 is located at the center bottom portion 21 and the periphery of the center bottom portion 21. And a peripheral bottom portion 22. 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, as described above, since the side portion 11 does not deform, the deformation of the bottom portion 20 does not stand out when viewed 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. FIGS. 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 cooker 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, the bottom portion 20 includes the bottom portion deformation promoting means 25 that promotes the deformation of the bottom portion 20 when the pressure inside the sheet forming tray 10 is reduced. Side deformation preventing means 12 is provided for preventing deformation of the side portion 11 when the pressure inside the molding tray 10 decreases. Thus, since the bottom portion 20 has a shape that is more easily deformed than the side portion 11, when the inside of the sheet forming tray 10 is decompressed, the bottom portion 20 is recessed toward the inside of the sheet forming tray 10, The part 11 is not deformed. Thus, the appearance of the food containing tray 15 can be maintained satisfactorily.

Moreover, the side part deformation | transformation prevention means 12 of the side part 11 contains the some reinforcement rib 13, and the intensity | strength of the side part 11 is raised. Therefore, in particular, even when the thickness of the side portion 11 is reduced to, for example, about 0.35 mm to 0.40 mm, it is possible to prevent a problem that the side portion 11 is deformed.

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.

Next, a modification of the present embodiment will be described. 9 to 11 are plan views showing sheet forming trays according to modifications. Each of the modified examples shown in FIGS. 9 to 11 is different in the configuration of the bottom portion deformation promoting means 25 of the bottom portion 20, and the other configurations are substantially the same as those in the above-described embodiment. 9 to 11, the same parts as those of the embodiment shown in FIGS. 1 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the sheet forming tray 10A shown in FIG. 9, the bottom portion deformation promoting means 25 of the bottom portion 20 has a central bottom portion 21 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 the triangular panel 72 provided corresponding to each edge | side 21b of the polygon panel 21a is provided between the polygon panel 21a and the peripheral bottom part 22. FIG. . In this case, the polygon panel 21a is a substantially regular hexagonal hexagonal panel. On the other hand, the triangular panel 72 is formed of an isosceles triangle, and a long side 72a (base) thereof is arranged so as to be connected to each side 21b of the polygon panel 21a. Six triangular panels 72 are provided corresponding to each side 21b of the polygon panel 21a, and these six triangular panels 72 have the same shape. In a state before the sheet forming tray 10A is deformed, the triangular panel 72 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 triangular panel 72. Is provided. In the vertical cross section, the angle formed by the central bottom 21 (polygonal panel 21a) and the triangular panel 72 can be set to 15 ° to 20 °.

In the sheet forming tray 10B shown in FIG. 10, the bottom portion deformation promoting means 25 of the bottom portion 20 has a central bottom portion 81 located at the center and a peripheral bottom portion 82 located at the periphery of the central bottom portion 81. Among these, the center bottom part 81 consists of a substantially flat surface, and has an elliptical shape. The peripheral bottom portion 82 has an elliptical shape. Furthermore, an elliptical circumferential step portion 83 is provided between the center bottom portion 81 and the peripheral bottom portion 82. In a state before the sheet forming tray 10B is deformed, the circumferential step portion 83 is provided inclined with respect to the central bottom portion 81, and the peripheral bottom portion 82 is provided inclined with respect to the circumferential step portion 83. ing. In the vertical cross section, the angle formed by the center bottom portion 81 and the circumferential step portion 83 can be 20 ° to 25 °, and the angle formed by the center bottom portion 81 and the peripheral bottom portion 82 is 40 ° to 50 °. It can be.

In the sheet forming tray 10 </ b> C shown in FIG. 11, the bottom portion deformation promoting means 25 of the bottom portion 20 has a central bottom portion 91 located at the center and a peripheral bottom portion 92 located at the periphery of the central bottom portion 91. Among these, the center bottom part 91 consists of a substantially flat surface, and the outer periphery of the center bottom part 91 has the 1st ellipse shape 91a. On the other hand, the outer periphery of the peripheral bottom 92 has a second elliptical shape 92a. The second elliptical shape 92a constituting the peripheral bottom portion 92 is larger than the first elliptical shape 91a constituting the central bottom portion 91, and the entire first elliptical shape 91a is arranged inside the second elliptical shape 92a. In this case, the major axis of the second elliptical shape 92a is shifted by 90 ° from the major axis of the first elliptical shape 91a. In a state before the sheet forming tray 10C is deformed, the peripheral bottom 92 is inclined with respect to the central bottom 91, and the peripheral bottom 92 and the central bottom in the vertical cross section along the major axis of the second elliptical shape 92a. The angle formed by 91 may be 15 ° to 20 °, and the angle formed by the peripheral bottom 92 and the center bottom 91 in the vertical cross section along the minor axis of the second elliptical shape 92a is 35 ° -40 °. It can be.

Claims

While storing food, in the sheet forming tray used when the stored food is cooked and sterilized,
Side,
A bottom connected to the side,
A flange portion provided around the side portion,
The bottom portion includes bottom portion deformation promoting means for accelerating deformation of the bottom portion when the inside of the sheet forming tray is depressurized.
The said side part has a side part deformation | transformation prevention means which prevents a deformation | transformation of the said side part, when the inside of the said sheet forming tray is pressure-reduced, The sheet | seat forming tray characterized by the above-mentioned.
2. The sheet molding tray according to claim 1, wherein the side deformation preventing means includes a reinforcing rib.
3. The sheet forming tray according to claim 2, wherein the reinforcing rib is provided in parallel to a plane on which the sheet forming tray is placed.
3. The sheet forming tray according to claim 2, wherein the reinforcing rib is provided over the entire circumference of the side portion.
2. The sheet forming tray according to claim 1, wherein a thickness of the side portion is 0.35 mm to 0.40 mm.
The bottom part deformation promoting means of the bottom part has a center bottom part and a peripheral bottom part located at a peripheral edge of the central bottom part, and the central bottom part is composed of a polygonal panel, between the polygonal panel and the peripheral bottom part. 2. The sheet forming tray according to claim 1, wherein a rectangular panel provided corresponding to each side of the polygonal panel is provided, and an inclined wall is provided along the outer periphery of the peripheral bottom.
A sheet forming tray according to claim 1;
Food stored in the sheet forming tray;
A food containing tray comprising: a lid member welded to the flange portion of the sheet forming tray.