WO2008065807A1

WO2008065807A1 - Tray for frozen food and frozen food package

Info

Publication number: WO2008065807A1
Application number: PCT/JP2007/069656
Authority: WO
Inventors: Yutaka Jumi
Original assignee: Sti Kiyari, Inc.
Priority date: 2006-11-29
Filing date: 2007-10-09
Publication date: 2008-06-05
Also published as: TW200836643A; JP2008131923A

Abstract

Provided are a frozen food tray enabling proper thawing of frozen food such as frozen sushi placed thereon and a frozen food package using the frozen food tray. The frozen food tray (30) has first intermediate surfaces (33A), a second intermediate surface (33B), recesses (32A, 32B) recessed from the intermediate surfaces (33A, 33B), a surrounding wall (34) raised from the peripheral edges of the intermediate surfaces (33A, 33B), and a flange part (35) forming the upper end part of the surrounding wall (34). The number of the recesses (32) is eight that are arranged in a matrix having two rows each having four of the eight with long sides of the recesses arranged in parallel to each other. The four recesses (32A) having low bottom surfaces and located at both ends of the rows are recessed from the first intermediate surfaces (33A). The four recesses (32B) having high bottom surfaces and located at the center of the rows are recessed from the second intermediate surfaces (33B). The bottom surfaces of the high-bottom-surface recesses (32B) are higher in level than the bottom surfaces of the low-bottom-surface recesses (32A). Microwave passes through the gap under the high-bottom-surface recesses (32B) to heat the recesses (32B).

Description

Specification

Frozen food tray and frozen food package

Field of Invention

[0001] The present invention relates to a tray for storing frozen food and a frozen food package using the tray.

Background of the Invention

[0002] Techniques for thawing frozen sushi with microwaves such as microwave ovens are disclosed in JP-A-8-80790, JP-A-998888, JP-A-10-210960, JP-A-11-8058. JP-A-11-251054, JP-A-11-307239, and JP2002-223711.

[0003] All of these known techniques are such that frozen sushi is placed on a flat plate-shaped thawing panel and irradiated with a microwave mouth wave.

[0004] It is desirable that the frozen sushi be thawed so that the shari is warmed to an appropriate temperature and the material is cold.

[0005] In the above prior art, the strength of the microwave is adjusted so that the microwave heats the shari rather than the material. For all the frozen sushi on the thawing panel, the shari is kept at an appropriate temperature. It is not easy to defrost the material so that it gets cold. A tray improved on this point is described in WO2005 / 007532 Patent Document 1: Japanese Patent Laid-Open No. 8-180790

Patent Document 2: JP-A-9 98888

Patent Document 3: Japanese Patent Laid-Open No. 10-210960

Patent Document 4: Japanese Patent Laid-Open No. 11 8058

Patent Document 5: Japanese Patent Laid-Open No. 11 251054

Patent Document 6: Japanese Patent Application Laid-Open No. 11 307239

Patent Document 7: Japanese Patent Laid-Open No. 2002-223711

Patent Document 8: WO2005 / 007532 Summary of the Invention

[0006] An object of the present invention is to provide a frozen food tray in which frozen food such as frozen sushi on the tray is appropriately thawed, and a frozen food package using the frozen food tray.

[0007] The frozen food tray of the first aspect is a frozen food tray having a recess for containing frozen food, the frozen food tray comprising a synthetic resin surface layer and a synthetic resin And a heat generating layer that is interposed between the front surface layer and the back surface layer and absorbs microwaves to generate heat.

[0008] The tray for frozen food according to the second aspect is characterized in that, in the first aspect, the surface layer and the back surface layer are made of polypropylene or polystyrene.

[0009] The tray for frozen food of the third aspect is characterized in that, in the first or second aspect, the heat generating layer contains at least one of carbon black and ferrite.

[0010] The frozen food tray of the fourth aspect includes a plurality of recesses for storing frozen foods, and at least a heating layer provided in the recesses that absorbs microwaves and generates heat. In the frozen food tray, the at least one recess is a high bottom recess whose bottom surface position is higher than the bottom surface position of the other recesses. .

[0011] The tray for frozen food of the fifth aspect is characterized in that, in the fourth aspect, each recess has a longitudinal side wall, a lateral side wall, and a bottom surface.

[0012] The tray for frozen food according to the sixth aspect is the fifth aspect, wherein there are a plurality of recess rows in which a plurality of recesses are arranged at intervals between the longitudinal side walls. The at least one recess row is arranged in parallel, and at least one recess in the row direction of the recess row is the high bottom recess. To do.

[0013] The tray for frozen food according to the seventh aspect is characterized in that, in the sixth aspect, the high bottom recesses are arranged in the middle of the row direction in all rows.

[0014] The frozen food tray of the eighth aspect is characterized in that, in the seventh aspect, in the adjacent rows, the respective high bottom recesses are arranged adjacent to each other.

[0015] In the eighth aspect, the tray for frozen food according to the ninth aspect is provided with two rows of the recesses and four recesses in each of the recess rows. Two recesses on the center side of The high bottom recess is a feature.

[0016] The frozen food tray according to the tenth aspect is the tray according to any of the sixth to ninth aspects, wherein the tray has an intermediate surface disposed in the middle in the vertical direction and a plurality of the recesses recessed from the intermediate surface. And a surrounding wall rising from the peripheral edge of the intermediate surface.

[0017] In the tenth aspect, the frozen food tray of the eleventh aspect has, as the intermediate surface, a first intermediate surface and a second intermediate surface higher than the first intermediate surface, The high bottom recess is arranged on the second intermediate surface.

[0018] The frozen food tray of the twelfth aspect is the eleventh aspect, wherein the first intermediate surface is

The rib portion is provided between the lateral walls of the adjacent recesses.

[0019] The frozen food tray of the thirteenth aspect is characterized in that, in the twelfth aspect, the height of the rib portion is lower than that of the surrounding wall.

[0020] The tray for frozen food according to the fourteenth aspect is the tray according to any one of the tenth to thirteenth aspects, wherein the tray further has an upright portion rising upward from a portion between the recesses, The upper end of the upright part and the upper end of the surrounding wall are the same height.

[0021] The frozen food tray of the fifteenth aspect is characterized in that, in the fourteenth aspect, a flat surface is provided on each of the upper end of the surrounding wall and the upper end of the upright part!

[0022] The frozen food tray of the sixteenth aspect is the fourth or fifth aspect, wherein the plurality of recesses are

They are arranged in a row, and at least one recess in the longitudinal direction of the row is a high-bottom surface recess.

[0023] The frozen food tray of the seventeenth aspect is any one of the fourth to sixteenth aspects. The frozen food tray comprises a synthetic resin surface layer, a synthetic resin back surface layer, these surface layers and And a heat generating layer that generates heat by absorbing microwaves.

[0024] The tray for frozen food according to the eighteenth aspect is the tray according to any one of the first to seventeenth aspects, wherein the recess communicates with a main recess in which the frozen food is stored, and the main recess. It consists of a sub-recess for inserting at least one of fingers and frozen food taking-out means when taking out. [0025] A frozen food package according to a nineteenth aspect includes a frozen food tray according to any one of the first to eighteenth aspects, a frozen food contained in the recess of the frozen food tray, and the frozen food. A synthetic resin packaging body that degass and wraps the frozen food tray containing the lid, a lid body that is covered on the synthetic resin packaging body on the upper surface side of the frozen food tray, and the lid body And a microwave shield provided on the substrate.

[0026] The frozen food package of the twentieth aspect is characterized in that, in the nineteenth aspect, the package is further encapsulated by shrink packaging.

[0027] The frozen food package of the twenty-first aspect includes a frozen food tray, a frozen food stored in the frozen food tray, and a lid that covers an upper surface of the frozen food tray containing the frozen food. In the frozen food package, the frozen food tray has a recess for containing the frozen food, and at least a heat generating layer provided in the recess to absorb microwaves and generate heat. The frozen food is contained in the recess, and the frozen food tray containing the frozen food is degassed and wrapped by a synthetic resin package, and the synthetic resin is disposed on the upper surface side of the frozen food tray. The lid is covered from above the package body, and the microwave shield is provided on the lid.

[0028] The frozen food package of the twenty-second aspect is characterized in that, in any of the nineteenth to twenty-first aspects, the lid is made of paper, and the micro is covered with a shield. is there.

[0029] The frozen food package of the twenty-third aspect is characterized in that in any of the nineteenth to twenty-second aspects, the microwave shield is an aluminum foil.

[0030] The twenty-fourth frozen food package is the nineteenth! /, And the twenty-third embodiment! /, In any case, the microwave shield is large enough to cover the top surface of the frozen food tray. It is characterized by having.

[0031] In the frozen food tray of the first aspect, the heat generating layer is interposed between the surface layer and the back surface layer made of synthetic resin, and the heat generating layer is not exposed to the outside. For this reason, the exothermic layer is surely prevented from rubbing and peeling off with other objects.

[0032] Further, this frozen food tray can be manufactured by pressing a sheet raw material comprising a laminate of the front surface layer, the back surface layer, and the heat generating layer. This is a synthetic resin tray. Compared with the case where a heat generating layer is formed by hand-coating a heating element, the manufacturing is easier. In addition, when applying a heating element by hand, it is necessary to perform baking after applying the heating element to prevent the heating element from being peeled off, and it takes time and effort, and the heating element layer becomes hard and cracks due to impact. It becomes easy. In contrast, in the frozen food tray of the present invention, since both sides of the heat generating layer are protected by the front surface layer and the back surface layer, there is no fear of peeling of the heat generating layer. For this reason, it is not necessary to bake the heat generating layer, and the production is easy. In addition, the heat generation layer can be hardened by baking.

[0033] When the frozen food tray of the first aspect is placed in a microwave oven and irradiated with microwaves, this heat generating layer absorbs the microwaves and generates heat, and this heat is transmitted to the frozen food, and the frozen food is dissolved. Frozen. The heat generated in the heat generation layer is mainly transmitted through the heat transfer from the contact surface between the tray recess and the frozen food, the radiation from the non-contact surface, or the air layer between the tray recess and the frozen food. It is transmitted to frozen food by all convection heat transfer. By heating in such a way as to be wrapped from the recess, uneven thawing of the frozen food in the recess can be prevented or suppressed.

[0034] In the frozen food tray of the present invention, the front surface layer and the back surface layer are preferably made of polypropylene (PP) or polystyrene (PS). In particular, it is preferably made of polypropylene (PP) mixed with fillers made of inorganic substances (PPF)! PPF is softer than synthetic resins such as PS and PP, so it is difficult to break even when subjected to impact.

[0035] In the frozen food tray of the present invention, the heat generating layer preferably contains at least one of carbon black and ferrite, and particularly preferably contains carbon black.

[0036] In the frozen food tray of the fourth aspect, the microwave reaches the high bottom recess through the space below the high bottom recess. Therefore, it is possible to sufficiently heat the frozen food stored in the high bottom recess. In addition, a frozen food with a small height can be stored in the high bottom recess, and a large bottom and a frozen food can be stored in the other bottom bottom and recess.

[0037] In the frozen food tray of the fourth aspect, it is preferable that the recess comprises a longitudinal side wall, a lateral side wall, and a bottom surface.

[0038] In the frozen food tray of the fourth aspect, a plurality of recesses IJ, in which a plurality of recesses are arranged at intervals between the longitudinal side walls, are provided in a plurality of rows in parallel. Have been In at least one recess row, at least one recess in the row direction of the recess row may be the high bottom recess.

[0039] In all the rows, the high bottom recess may be arranged in the middle of the row direction.

[0040] In adjacent rows, it is preferable that the respective high bottom recesses be arranged adjacent to each other. As a result, microwaves can pass through the lower space of each row of the high bottom recesses, and each of the high bottom recesses and the nearby recesses are sufficiently heated. As a result, the frozen food in the recess arranged on the center side of the tray can be sufficiently heated.

[0041] It should be noted that even if at least one of the plurality of recess rows is a high and low recess, the microwave passes through the space below the row of the high bottom recesses, The recess located on the center side can also be heated sufficiently.

[0042] The tray for frozen food according to the fourth aspect has an intermediate surface disposed in the middle of the vertical direction, a plurality of the recesses recessed from the intermediate surface, and a surrounding wall rising from the periphery of the intermediate surface. Is preferred. As a result, when frozen sushi is stored as frozen food in the frozen food tray, the sushi ball portion of the frozen sushi is placed in the recess of the tray so that the material is placed higher than the recess. Can do. Shari is heated to an appropriate temperature by heat transfer from the heat generation layer in the recess. On the other hand, because the material is higher than the recess, the material is thawed so that it gets cold.

[0043] The intermediate surface has a first intermediate surface and a second intermediate surface higher than the first intermediate surface, and the high bottom recess is disposed on the second intermediate surface. It is preferable. As a result, a space can be provided between the bottom of the bottom of the high bottom recess and the tray installation surface, and the depth of the high bottom recess (from the second intermediate surface to the bottom of the high bottom recess). The distance) can be adjusted to the depth of the other recess (distance from the first intermediate surface to the bottom surface of the recess). For this reason, for example, even if frozen sushi of the same shape is stored in either the high bottom recess or other recesses, the sharp ball part is placed in the recess and the material is higher than the recess. The ability to be placed is S. In addition to storing nigiri sushi in a high bottom recess, tall frozen foods such as cut rolls and California rolls can be stored in recesses other than the high bottom recess. [0044] On the first intermediate surface, a rib portion may be provided between the side walls in the short direction of the adjacent recesses. As a result, even when tall frozen foods such as thick rolls are stored in the recesses other than the high bottom recess, the frozen food is prevented from moving the recess force during transportation. .

[0045] The height of the rib portion is preferably lower than that of the surrounding wall. As a result, when the cover is placed on the top surface of the frozen food tray, the back surface of the cover can be brought into contact with the upper end of the surrounding wall without being obstructed by the rib portion.

[0046] The tray for frozen food according to the fourth aspect further has a raised portion that rises upward from a portion between the recesses, and the upper end of the raised portion is the same as the upper end of the surrounding wall. It is preferable that the height is high. Thereby, it becomes possible to support a cover body by this standing upper part. As a result, even if the lid is pressed, the force S is used to prevent the frozen food from being torn or pressed by the lid.

[0047] By providing a flat surface at the upper end of the surrounding walls and the upper end of the upright portion, the support S is appropriately supported by the force S.

[0048] When the plurality of recess rows are provided in two rows and each recess row has four recesses, two rows in the row direction of the recess rows are provided. The recess may be a high bottom recess.

[0049] When a total of eight recesses are arranged in this way, the four recesses on the central side are less likely to be irradiated with microwaves than the four recesses on the outer side. For this reason, it is preferable that these four recesses on the central side are high bottom recesses. As a result, even in the four high bottom recesses on the center side, microwaves are irradiated through the space below the high bottom recess, and the same as the four recesses on the outside. Can be heated to an extent.

[0050] The tray for frozen food according to the fourth aspect may be arranged in a recess force row, and at least one recess in the longitudinal direction of the row may be a high bottom recess. As a result, the high bottom recesses can be heated strongly and can be heated to the same extent as the recesses arranged at both ends of the row.

[0051] In the first and fourth embodiments, these recesses include a main recess in which the frozen food is accommodated, and at least the finger and the frozen food take-out means when communicating with the main recess to take out the frozen food. one It may consist of a sub-recess for insertion. Thereby, frozen food can be easily taken out from the recess.

[0052] In the frozen food package of the nineteenth aspect, the frozen food tray of the first or second invention and the frozen food contained in the recess are deaerated and packaged in a synthetic resin package. As a result, the frozen food in the recess is pressed by the synthetic resin package. For this reason, it is possible to prevent the frozen food from jumping out of the recess even if an impact is applied to the frozen food package during transportation or the package is turned over. In addition, for example, when the frozen food is frozen sushi, it is possible to prevent the material from being peeled off from the sharp balls. Furthermore, the frozen food is prevented from coming into contact with the lower surface of the lid. In particular, even when a metal microwave shield is provided on the lower surface of the lid, the frozen food is reliably prevented from coming into direct contact with the metal microwave shield.

[0053] In the nineteenth aspect, since the lid body has the microwave shield, the microwave irradiated from above the frozen food package is shielded by the microwave shield. As a result, the heating of the material is suppressed, and it is possible to defrost the material so that the material becomes cool and the material cools.

[0054] The frozen food package of the nineteenth aspect is preferably further shrink-wrapped. This reliably prevents the lid from coming off.

[0055] Even in the frozen food package of the twenty-first aspect, the frozen food tray and the frozen food stored in the recess are deaerated and packaged with a synthetic resin package. As a result, the frozen food in the recess is pressed down by the synthetic resin package. For this reason, even if an impact is applied to the frozen food package during transportation or the package is turned over, the frozen food is prevented from jumping out of the recess. Further, for example, when the frozen food is a frozen sushi, it is possible to prevent the material from being peeled off from the sharp balls. Furthermore, the frozen food is prevented from coming into contact with the microwave shield disposed on the lower surface of the lid.

[0056] In the twenty-first aspect, since the lid body has the microwave shield, the microwave irradiated from above the frozen food package is shielded by the microwave shield. As a result, the heating of the material is suppressed, and it is possible to defrost the material so that the material becomes cool and the material cools.

[0057] This lid may be made of paper. The microwave shield may be an aluminum foil. The microwave shield is preferably provided so as to cover the frozen food tray. Brief Description of Drawings

FIG. 1 is a perspective view of a frozen food tray 30 according to an embodiment.

FIG. 2 is a plan view of the frozen food tray 30 of FIG. 1.

FIG. 3 is a sectional view taken along line III-III in FIG. 2.

[FIG. 4] FIG. 4a is a sectional view taken along line IVa-IVa in FIG. 2, and FIG. 4b is an enlarged sectional view of the IVB portion in FIG. 4a.

FIG. 5 is a sectional view taken along line V—V in FIG. 2.

FIG. 6 is a sectional view taken along line VI—VI in FIG.

FIG. 7 is a perspective view of the frozen food tray 30 and the lid 60 of FIG. 1.

FIG. 8 is a rear view of the lid 60 in FIG. 7.

FIG. 9 is a cross-sectional view of a frozen food package 70 according to an embodiment.

FIG. 10 is a cross-sectional view of a frozen food package 70 according to an embodiment.

FIG. 11 is a perspective view of a frozen food tray 1 according to another embodiment.

[FIG. 12] FIG. 12a is a longitudinal sectional view illustrating a state in the middle of manufacturing a frozen food package using the tray 1 of FIG. 11, and FIG. 12b is an enlarged view of the ridge portion of FIG. 12a.

[FIG. 13] FIG. 13a is a diagram for explaining the arrangement of frozen sushi in the embodiment, and FIG.

Detailed description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a frozen food tray 30 according to an embodiment, and FIG. 2 is a plan view of the frozen food tray 30 of FIG. 1, FIG. 3, FIG. 4a, FIG. Figures 6 and 6 are cross-sectional views taken along lines III-III, IVa-IVa, V-V, and VI-VI in Fig. 2, respectively. FIG. 4b is an enlarged cross-sectional view of the IVB portion of FIG. 4a. FIG. 7 is a perspective view of the frozen food tray 30 and the lid 60 of FIG. 1, and FIG. 8 is a back view of the lid 60 of FIG. 9 and 10 are sectional views of the frozen food package 70 according to the embodiment.

[0061] The tray for frozen food (hereinafter sometimes simply referred to as a tray) 30 includes a first intermediate surface 33A and a second intermediate surface 33B, and recesses 32A and 32B recessed from the intermediate surfaces 33A and 33B. The surrounding wall 34 is erected from the peripheral edge of the intermediate surfaces 33A and 33B, and the upper end of the surrounding wall 34 is configured. It is erected from the flange portion 35, the hanging portion 36 that hangs down from the outer peripheral edge of the flange portion 35, the overhang portion 37 that projects outward from the lower edge of the hanging portion 36, and the intermediate surfaces 33A and 33B. With uprights 39.

As shown in FIG. 2, the surrounding wall 34 has a substantially square frame shape, but the four corner portions are curved in an arc shape.

[0063] The first intermediate surfaces 33A, 33A are arranged so as to be continuous with both sides of the second intermediate surface 33B.

The second intermediate surface 33B is higher than the first intermediate surfaces 33A, 33A, and the boundary between the second intermediate surface 33B and the first intermediate surface 33A becomes a stepped portion! Figure).

[0064] Hereinafter, the recesses 32A and 32B may be collectively referred to as the recess 32.

[0065] As shown in FIGS. 2 and 5, the recesses 32 are provided in two rows of four, a total of eight, vertically and horizontally. The two recesses 32B on the center side of each row are recessed from the second intermediate surface 33B, and the two recesses 32A on both ends of the row are recessed from the first intermediate surface 33A.

[0066] The recess 32 communicates with the main recess 32s in which the frozen food is accommodated, and inserts frozen food take-out means such as fingers and chopsticks when the frozen food is taken out. It consists of a secondary recess 32f (Fig. 2).

[0067] The main recess 32s has a substantially rectangular shape in plan view, and has longitudinal side walls 32a and 32a, lateral side walls 32b and 32b, and a bottom surface 32c (FIG. 2). The corners where the side walls 32a and 32b of the recess 32 intersect are both smoothly curved.

[0068] The sub-recess 32f communicates with the side wall 32b on the side of the surrounding wall 34 of the main recess 32s.

[0069] The sub-recess 32f has a shape in which a part of the lateral side wall 32b is bulged away from the main recess 32s.

[0070] In the row of four recesses 32A, 32B, 32B, 32A, the short side walls 32b of the recesses 32A, 32B, 32B, 32A are oriented in the column direction. The short side walls 32b of the recesses 32A, 32B, 32B, 32A constituting one row are arranged in a straight line.

[0071] Further, the longitudinal side walls 32a of the recesses 32A, 32B, 32B, 32A extend in a direction substantially orthogonal to the column direction. The longitudinal side walls 32a and 32a of the recesses 32A and 32A in adjacent rows are arranged on a straight line, and the longitudinal side walls 32a and 32a of the recesses 32B and 32B are also arranged on a straight line. [0072] The direction of the row of the four recesses 32A, 32B, 32B, 32A is parallel to one side of the surrounding wall 34.

[0073] The low bottom recess 32A and the high bottom recess 32B have the same dimensions, and are sized to accommodate the sushi balls of frozen sushi.

[0074] As shown in Figs. 3 and 4a, the bottom surface 32c of the high bottom recess 32B is higher than the bottom surface 32c of the low bottom recess 32A!

[0075] The tray 30 is preferably sized to be placed in a commercial or home microwave oven.

The flange portion 35 constitutes the upper end surface of the surrounding wall 34, and is provided over the entire circumference of the surrounding wall 34 so as to expand outward. The flange portion 35 is a flat surface and supports a lid 60 described later.

The outer peripheral force of the flange portion 35, and the drooping portion 36 that hangs down, circulates the entire circumference of the flange portion 35. The force by which the overhanging portion 37 projects outward from the lower end of the hanging portion 36. The overhanging length of the overhanging portion 37 is extremely small. By providing the drooping portion 36 and the overhanging portion 37, the rigidity of the tray 30 is increased, and a fingertip can be hung when the tray 30 is held.

[0078] Three rising portions 39 are provided at intervals on the second intermediate surface 33B. The self IJ direction of the upright portions 39, 39, 39 is the same as the lj direction of the four recesses 32A, 32B, 32B, 32A. The middle of the three uprights 39 is located in the center of tray 1. The remaining two upstanding portions 39 are positioned in the vicinity of the step between the first intermediate surface 33A and the second intermediate surface 33B, respectively. The upper end surface of the upright portion 39 is a flat surface having the same height as the upper surface of the flange portion 35, and the lid body 60 can be supported by the top surface of the upright portion 39. The upright portion 39 is provided in a substantially conical shape so as to have a skirt in four directions.

[0079] In the first intermediate surface 33A, a rib portion 39A is raised from a portion between the recesses 32A and 32A. Each rib portion 39A extends so as to connect the surrounding wall 34 and the upright portion 39 of the stepped portion. The flat first intermediate surface 33A exists on both sides of the rib portion 39A, where the width of the rib portion 39A is smaller than the interval between the recesses 32A and 32A in the first intermediate surface 33A. By providing the rib 39A, if frozen nigiri sushi is stored in this recess 32, Movement in the longitudinal direction of the recess 32 is prevented. By providing the upright portion 39 and the rib portion 39A, the rigidity of the tray 30 is also improved.

[0080] As shown in Fig. 4b, the tray 30 is composed of a laminate 31 composed of a surface layer 31a and a back layer 31c made of synthetic resin, and a heat generating layer 31b interposed therebetween.

[0081] The synthetic resin constituting the surface layer 31a and the back layer 31c is preferably made of PS (polystyrene) or PP (polypropylene). In particular, a filler made of an inorganic substance or the like is mixed with polypropylene (PP). Especially preferred to be made of things (PPF)!

[0082] The thicknesses of the front surface layer 31a and the back surface layer 31c are preferably 5 to 100 m, more preferably 10 to 80 m, and particularly preferably about 20 to 70 m.

[0083] The heat generating material of 3 lb of the heat generating layer is not limited to force S, which is preferably carbon black or the like.

[0084] In order to produce this laminate 31, for example, carbon black is dispersed in an organic solvent made of toluene, ethyl alcohole, isopropylenorenoorenole, methinorenoleketone, propylene glycolenole, monomethyl ether, or the like. Prepare carbon ink. The carbon ink is attached to the outer surface of the surface layer 31a by a technique such as spraying, brushing, or dating, and dried to form the heat generating layer 31b. In addition, it is preferable to degrease the outer surface of the surface layer 31a before forming the heat generating layer 31b. Next, the laminated body 31 is formed by forming the back surface layer 31c on the heat generating layer 31b. Note that the tray 30 is formed by press-molding the laminate 31 with a mold or the like.

The thickness of the heat generating layer 31b is preferably 10 to 100 μm, particularly 10 to 80 μm, particularly 30 to 60 μm.

[0086] When the frozen food tray 30 is used as a frozen sushi tray, the height difference between the first intermediate surface 33A and the second intermediate surface 33B is preferably 5 to 25 mm, particularly 10 to 15 mm. is there. The height difference between the recess 32A and the recess 32B is preferably 5 to 25 mm, particularly 10 to 15 mm.

[0087] In order to construct a frozen sushi package using the tray 30 configured as described above, frozen sushi 40 is stored in each recess 32 (32A, 32B). Is deaerated and packaged by the synthetic resin package 50. Next, on the top of this tray 30 On the other hand, the frozen food package 70 is configured by covering the cover 60 from above the synthetic resin package 50. The frozen food package 70 may be further shrink-wrapped. When shrink wrapping is not applied, the lid 60 is fixed by wrapping it or putting it in an outer box.

[0088] The synthetic resin package 50 is preferably a thermoplastic synthetic resin bag such as nylon or polyethylene, but is not limited thereto as long as it has resistance to microwave irradiation.

[0089] The lid 60 is preferably made of paper. The lid 60 is not limited to this as long as it has resistance to microwave irradiation!

[0090] As shown in Figs. 7 and 8, the lid 60 has a substantially square lid body 61, a first extension 62 extending outward from its four sides, and the first extension. The second extending portion 63 extends outward from the outer end of 62. The lid 60 can be bent along a boundary line 64 between the lid body 61 and the first extension 62, and the boundary between the first extension 62 and the second extension 63. It can be folded along line 65. An aluminum foil 66 as a microwave shield is adhered to the back surface of the lid 60.

[0091] When the thickness of the aluminum foil 66 is small, the aluminum foil itself generates heat and excessively raises the temperature of the material. Therefore, the aluminum foil 66 is desirably 10 m or more, particularly 12 m or more. Aluminum foil 66 should be 100 μm or less, especially 50 Hm or less, especially 20 μm or less for cost reduction! / ヽ. The aluminum foil preferably has a size that covers the entire open upper surface of the tray 30.

As shown in FIG. 9, when the lid 60 is placed on the tray 30, the peripheral portion of the lid body 61 faces the flange portion 35 of the tray 30 via the synthetic resin package 50. Further, the first extending portion 62 is folded downward from the boundary line 64 and the second extending portion 63 is folded inward from the boundary line 65.

[0093] When this sushi 40 is a nigiri sushi, it has a shari ball 41 and a material 42 on the shari ball 41. If necessary, rust rust is interposed between the ball 41 and the material 42. The material 42 is not limited to force S exemplified by seafood such as salmon, toro, squid, octopus, shellfish, shrimp and conger, its cooked products, and egg-bake.

[0094] As shown in Fig. 9, the frozen sushi 40 has the whole or most of the shari balls 41 in the recesses 32. The entire material 42 is arranged above the level of the intermediate surfaces 33A and 33B. Note that a very small part of the material 32 may exist in the recess 32. It is desirable that 90% or more, especially 95% or more, of the ball 31 is disposed in the recess 32 (that is, it exists below the intermediate surfaces 33A and 33B).

[0095] Normally, it is preferable that the size of the sushi balls of frozen sushi be 10 to 50 g, especially 15 to 40 g, especially 18 to 25 g! The material is 3-40g, especially 5-30g, especially 6-20g.

[0096] In general, in the case where the recesses are provided in parallel in the long side direction, each having two recesses of 2 mm IJ, a total of eight, vertically and horizontally, as in the tray 30 of the present embodiment, The four recesses located on the center side of the tray are less accessible to microwaves than the four recesses located outside the tray.

However, in the tray 30 according to the present embodiment, the position of the bottom surface 32c of the high bottom recess 32B is higher than the position of the bottom surface 32c of the low bottom recess 32A and is accommodated in the microwave oven. In the state, there is a gap below the high bottom recess 32B. Therefore, the microwave force S reaches the high and low surface recess 32B through this gap, and the high bottom recess 32B is heated. As a result, the frozen sushi 40 in the high bottom recess 32B can be heated to the same extent as the frozen sushi 40 in the low bottom recess 32A.

[0098] In FIG. 9, frozen sushi 40 made of nigiri sushi is stored in both the low bottom recess 32A and the high bottom recess 32B. However, as shown in FIG. Large rolls or California rolls 40A such as California rolls may be stored. As shown in Fig. 10, the distance from the bottom 23c of the bottom recess 32A to the upper end (flange 30) of the tray 30 is large! Can do.

[0099] In the frozen food package 70 of the present embodiment, the frozen sushi 40 contained in the frozen food tray 30 and the recess 32 (32A, 32B) is replaced with the synthetic resin package 50. Deaerated packaging. This prevents the frozen sushi 40 from popping out of the recess 32 even when an impact is applied to the frozen food package 70 during transportation or the package 70 is turned over. In addition, it is possible to prevent the material from peeling off from the sharp balls. Further, the frozen sushi 40 is prevented from coming into contact with the lid 60 and the aluminum foil 66. In addition, since the aluminum foil 66 is disposed on the lower surface of the lid 60, the top of the frozen food package 70 is provided. The microwave irradiated from one side is shielded by the aluminum foil 66. As a result, heating of the material is suppressed, and it is possible to defrost the material so that the material becomes cool and the material cools.

[0100] In the above explanation, frozen food is frozen sushi, but by changing the size and number of recesses 32, it can also be applied to various confectionery and ingredients such as frozen cakes, frozen rice cakes, and frozen curry rice. it can.

[0101] Further, the number and arrangement of the recesses and the high bottom recesses are not limited to this and may be selected according to the size of the tray. For example, three or five or more recesses 32 may be provided in one row. When five or more recesses 32 are provided in one row, the number of the recesses 32 arranged on the first intermediate surface 33A may be one or two or more. Further, in the above-described embodiment, a force of 3 歹 IJ or more that provides 2 歹 IJ for the recesses 32A, 32B, 32B, 32A may be provided.

[0102] Further, in the present invention, only one column may be provided.

[0103] Fig. 11 is a perspective view of a frozen food tray 1 according to another embodiment, Fig. 12a is a longitudinal sectional view explaining a state in the middle of manufacturing a frozen food package using this tray 1, Fig. 12b is an enlarged view of the heel portion of Fig. 12a.

[0104] This frozen food tray (hereinafter sometimes simply referred to as a tray) 1 is erected from a main bottom surface 3, a recess 2 recessed from the main bottom surface 3, and a peripheral edge of the main bottom surface 3. A surrounding wall 4, a flange part 5 constituting the upper end of the surrounding wall 4, a hanging part 6 hanging from the outer peripheral edge of the flange part 5, and an overhang projecting outward from the lower edge of the hanging part 6 A portion 7, a rib 8 provided at a corner of the main bottom surface 3 and the surrounding wall 4, and an upright portion 9 erected from the main bottom surface 3.

[0105] The recess 2 has a substantially rectangular shape in plan view, and has a side wall 2a in the longitudinal direction, a side wall 2b in the lateral direction, and a bottom surface 2c. Concavities 2 are provided vertically and horizontally, with 2 long IJs, 4 in total, with the long side direction parallel.

[0106] This recess 2 is sized to accommodate a sushi ball of frozen sushi. Note that the corners where the side walls 2a and 2b of the recess 2 intersect are both smoothly curved.

[0107] The main bottom surface 3 has a substantially square outer edge shape, but the four corner portions along the surrounding wall 4 are curved in an arc shape.

The main bottom surface 3 between the side walls 2a, 2a in the longitudinal direction of the adjacent recesses 2, 2 is a strip-like portion 3a extending along these side walls 2a, 2a. [0109] The main bottom surface 3 between the side walls 2b, 2b in the lateral direction of the adjacent recesses 2, 2 extends along the side walls 2b, 2b.

[0110] The surrounding wall 4 is provided so as to go around the entire periphery of the main bottom surface 3. Enclosure 4 is a recess

2 has a wall 4a parallel to the side wall 2a in the longitudinal direction and a wall 4b parallel to the side wall 2b in the short direction. The rib 8 is provided at the intersection corner between the wall 4 b of the surrounding wall 4 and the main bottom surface 3.

[0111] The flange portion 5 constitutes the upper end surface of the surrounding wall 4, and is provided over the entire circumference of the surrounding wall 4 so as to expand outward. This flange 5 becomes a flat surface!

The drooping portion 6 that hangs down from the outer peripheral edge of the flange portion 5 circulates the entire circumference of the flange portion 5. The force that the overhanging portion 7 projects outward from the lower end of the hanging portion 6 The overhanging length of the overhanging portion 7 is extremely small. By providing the hanging portion 6 and the overhanging portion 7, the rigidity of the tray 1 is increased, and a fingertip can be hung when the tray 1 is held.

[0113] The upright portion 9 is located at the intersection of the belt-like portions 3a and 3b. The upper end surface of the upright portion 9 is a flat surface having the same height as the upper surface of the flange portion 5. The upright portion 9 is provided in a substantially conical shape so as to have a tail in four directions, that is, in the directions of the belt-like portions 3a, 3a, 3b, 3b.

[0114] A rib portion 9A is raised from the belt-like portion 3b. The rib portion 9A extends between the upright portions 9 and 9 so as to connect the upright portions 9 and 9. The rib portion 9A also extends so as to connect the upright portion 9 and the wall 4a of the surrounding wall 4. The width of the rib 9A is smaller than the width of the band 3b, and the band 3b is present on both sides of the rib 9A. Providing the rib portion 9A prevents the material from moving in the longitudinal direction of the recess 2. By providing the upright portion 9 and the rib portion 9A, the rigidity of the tray 1 is also improved.

[0115] As shown in Fig. 12b, the tray 1 is composed of a synthetic resin main body la and a heat generating layer lb formed on the outer surface of the main body la. The synthetic resin constituting the tray body la is not limited to force S exemplified by polypropylene and the like. The thickness of the tray body la is 100 – 1500 a m, especially 300 to 800 μm, especially 500 to 800 μm!

[0116] In this embodiment, the heat generating layer lb is formed on the entire outer surface of the tray 1, that is, the outer surface of the bottom surface 2c of the recess 2, the outer surface of the side walls 2a and 2b, the lower surface of the main bottom surface 3, the outer surface of the surrounding wall 4, and its flange portion 5 The bottom surface of the hanging portion 6, the surface facing the surrounding wall 4, the bottom surface of the overhang 7, the bottom surface (back surface) of the rib 8, It is formed on the lower surface (back surface)!

[0117] However, the heat generating layer lb may not be provided partially. For example, the heat generating layer lb may not be provided in the flange portion 5, the hanging portion 6, and the overhang portion 7. The thickness of the heating layer lb may be uniform as a whole or may be thick. For example, the heat generation layer lb on the bottom surface or side surface of the recess 2 may be thicker than other portions.

[0118] The heat generating layer lb is obtained by adhering a paint in which the resin for forming a coating film is dissolved and the powder of the heat generating element is dispersed to the outer surface of the tray main body la by a method such as spraying, brushing, or dating. Then, the one formed by baking is preferable. As the heating element, ferrite, carbon black or the like is used, and carbon black is preferable. The thickness of the heat generating layer lb is 10 to 10; lOO ^ m, especially 10 to 80 mm 111, especially 30 to 60 mm 111 is suitable. Prior to the formation of the coating film, the outer surface of the tray body la is preferably degreased.

[0119] In the recess 2 of the tray 1 configured as described above, the frozen sushi 40 is accommodated in the same manner as in the above embodiment. Degassed and packaged by the package 50. Next, the upper surface of the tray 30 and the frozen sushi 40 is covered with the lid 60 from above the synthetic resin package 50, whereby the frozen food package 70 is configured.

[0120] Even in the frozen food package of the present embodiment, the frozen food tray 1 and the frozen food 10 accommodated in the recess 2 are deaerated and packaged by the synthetic resin package 50. This prevents the frozen food 10 from jumping out of the recess 32 even when an impact is applied to the frozen food package or the package is turned over during transportation. In addition, the material is prevented from peeling off from the sharp balls. Further, the frozen food 10 is prevented from coming into contact with the lid 60 or the aluminum foil 66. Further, since the aluminum foil 66 is disposed on the lower surface of the lid 60, the microwave irradiated from above the frozen food package 70 is shielded by the aluminum foil 66. As a result, heating of the material is suppressed, the shear is adjusted to an appropriate temperature, and the force S is used to quickly freeze the material so that the material gets cold.

Example

[0121] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[0122] In the embodiment, in the frozen food package 70, the height position of the first intermediate surface 33A And the second intermediate surface 33B having different height positions were used. Further, in Comparative Example 1, in the frozen food package 70, the height position of the first intermediate surface 33A and the height position of the second intermediate surface 33B were matched. The frozen food package 70 is described below.

[0123] In the laminate 31 constituting the tray 30, the surface layer 31a is a 65 m thick PPF, the back layer 31b is a 25 am thick PPF, and the heat generating layer 31b is a 40 μm thick carbon black. Layered. The carbon black content in the composite layer is about 34% by weight.

[0124] The dimensions of each part of the tray 1 are as follows.

Tray 1 side length: 210mm

Depth 32A, 32B depth: 20mm

Size of recess 32A, 32B, upper part: 62 X 32mm

Bottom: 57 X 27mm

Difference in height between the height position of the first intermediate surface 33A and the height position of the second intermediate surface 33B

: Same height (Comparative example 1)

: 5mm (Example 1)

: 10mm (Example 2)

: 15mm (Example 3)

Height from first intermediate surface 33A to upper end of flange 34 (flange 35): 22mm

[0125] Frozen sushi (stuff: tuna) is stored in a total of 8 recesses 32 in this tray 1 and most of the shari balls 41 are placed in the recesses 32 as shown in Fig. 9. 1 Intermediate surface 33A, 2nd intermediate surface 3 3B and higher. Shari ball 41 is 22g, and material 42 is 10g on average.

[0126] As the synthetic resin package 50, a nylon bag having a thickness of 85 m was used. Using this nylon bag, the tray 30 containing the frozen sushi 40 was deaerated and packaged.

[0127] In the lid 60, the lid body 61 was made of paper with a thickness of 0.6 mm, and the anoremi foil 66 was 15 m thick.

[Examples and Comparative Examples]

Each of the frozen food packages 70 (refrigeration temperature: —20 ° C) of the above-mentioned comparative example 1 and example;! ~ 3 stored frozen was transferred to a microwave oven “NE—S22F” (Microwave output: 60 OW), heated for 2 minutes and 20 seconds, and then allowed to thaw for 5 minutes. 10 tests

The temperature (° C) of each ball and material was measured. The results are shown in Tables !!-4.

[0129] Frozen sushi placed in each recess was named as shown in Fig. 13a. As shown in Fig. 13b, the temperature measurement position Ds of the sharp ball is the center of the sharp ball, and the temperature measurement position D n of the material is the center of the top surface of the material.

[0130] [Table 1]

Comparative Example 1 (No height difference) Unit: ° c

The sushi boiled with the material is indicated by ().

1 Difference: 5mm

The sushi boiled with the material is indicated by ().

Example 2 (Elevation difference 10mm

The sushi boiled with the material is indicated by ().

As is clear from the comparison between Comparative Example 1 and Examples;! To 3, the central four recesses are made into high bottom recesses, and the frozen sushi inside these four recesses and the outside In the frozen sushi in the four recesses, the temperature difference between the shari-tama and the material decreased. [0135] In particular, in the frozen sushi of Examples 2 and 3, the temperature difference of the shari balls and the temperature difference of the material were improved within a range of 5 to 10 ° C. The reason for this is that, by providing the high bottom recess, a space is generated between the bottom of the high and low recess and the bottom of the microwave oven when the package is accommodated in the microwave oven. This is thought to be because the microwave was sufficiently irradiated to the high bottom recess on the center side.

[0136] From the above, it was found that the height difference between the four elevation recesses on the central side and the four lower recesses on the outer side is preferably 10 mm or more. In order not to be bulky, the height difference is more preferably 10 mm.

[0137] Although the invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.

This application is based on a Japanese patent application (Japanese Patent Application No. 2006-322348) filed on November 29, 2006, which is incorporated by reference in its entirety.

Claims

The scope of the claims

[1] In a frozen food tray with a recess for containing frozen food,

The frozen food tray includes a synthetic resin surface layer, a synthetic resin back surface layer, and a heat generation layer that is interposed between the surface layer and the back surface layer and generates heat by absorbing microwaves. A tray for frozen foods.

[2] The tray for frozen food according to claim 1, wherein the front surface layer and the back surface layer are made of polypropylene or polystyrene.

[3] The tray for frozen food according to claim 1, wherein the heat generating layer contains at least one of carbon black and ferrite.

[4] In a frozen food tray having a plurality of recesses for storing frozen foods, and at least a heating layer provided in the recesses that absorbs microwaves and generates heat.

The tray for frozen food, wherein the at least one recess is a high bottom recess whose bottom surface position is higher than the bottom surface position of the other recesses.

[5] The tray for frozen food according to claim 4, wherein each recess has a side wall in the longitudinal direction, a side wall in the lateral direction, and a bottom surface.

[6] In Claim 5, a plurality of recesses IJ formed by arranging a plurality of recesses at intervals between the longitudinal side walls are provided in a plurality of rows in parallel.

A tray for frozen food, wherein in at least one recess row, at least one recess in the row direction of the recess row is the high bottom recess.

[7] The tray for frozen food according to claim 6, wherein in all the rows, the high bottom recess is arranged in the middle of the row direction.

8. The frozen food tray according to claim 7, wherein in the adjacent rows, the respective high bottom recesses are arranged adjacent to each other.

[9] In Claim 8, two rows of the recesses are provided, and four recesses are provided in each recess row, and two recesses on the center side of each recess row are provided. A tray for frozen food, wherein the high bottom recess is provided.

[10] The tray according to claim 6, wherein the tray has an intermediate surface disposed in the middle of the vertical direction, the intermediate surface force, a plurality of the recesses recessed from the intermediate surface, and a surrounding wall rising from a peripheral edge of the intermediate surface. thing A tray for frozen foods.

[11] In Claim 10, the intermediate surface includes a first intermediate surface and a second intermediate surface higher than the first intermediate surface,

A tray for frozen foods, wherein the high bottom recess is disposed on the second intermediate surface.

[12] The tray for frozen food according to claim 11, wherein a rib portion is provided between the lateral walls of the adjacent recesses on the first intermediate surface.

[13] The tray for frozen food according to claim 12, wherein the height of the rib portion is lower than that of the surrounding wall.

[14] In Claim 10, the tray further has a raised portion that rises upward from a portion between the recesses, and the upper end of the raised portion and the upper end of the surrounding wall have the same height. A tray for frozen foods, characterized in that

[15] The tray for frozen food according to claim 14, wherein a flat surface is provided at each of an upper end of the surrounding wall and an upper end of the upright portion.

[16] In Claim 4, the plurality of recesses are arranged in a row,

A tray for frozen food, wherein at least one recess in the longitudinal direction of the row is a high bottom recess.

[17] The frozen food tray according to claim 4, wherein the tray for a frozen food is interposed between a surface layer made of a synthetic resin, a back layer made of a synthetic resin, and the surface layer and the back layer, and absorbs microwaves to generate heat. A tray for frozen food, comprising a heat generating layer.

[18] In Claim 1, the recess communicates with the main recess in which the frozen food is stored, and inserts at least one of the finger and the frozen food take-out means when the frozen food is taken out. A tray for frozen food, characterized by comprising a sub-recess for storage.

[19] A frozen food tray according to claim 1,

Frozen food contained in the recess of the frozen food tray;

A synthetic resin packaging body for degassing and packaging the tray for frozen food containing the frozen food;

Covered from above the synthetic resin package on the upper surface side of the frozen food tray A lid,

A microwave shield provided on the lid;

A frozen food package characterized by comprising:

20. The frozen food package according to claim 19, wherein the package is further encapsulated by shrink wrapping.

[21] In a frozen food package comprising a frozen food tray, a frozen food stored in the frozen food tray, and a lid that covers the top surface of the frozen food tray containing the frozen food.

The tray for frozen food has a recess for containing frozen food, and at least a heat generating layer that is provided in the recess and absorbs microwaves to generate heat.

The frozen food is contained in the recess;

The frozen food tray containing the frozen food is degassed and wrapped by a synthetic resin package;

The lid is covered on the synthetic resin packaging body on the upper surface side of the frozen food tray;

A frozen food package comprising a microwave shield on the lid

22. The frozen food package according to any one of claims 19 to 21, wherein the lid is made of paper and the microphone mouth wave shield is attached.

[23] The frozen food package according to any one of claims 19 to 21, wherein the microwave shield is an aluminum foil.

24. The frozen food package according to claim 19, wherein the microwave shield has a size that covers an upper surface of the frozen food tray.