Tray

Abstract

To provide a tray which can appropriately open a lid material.SOLUTION: A tray includes a paper blank, a resin film, and a lid material. The blank has a recess, and a flange part. The flange part annularly overhangs from the upper end of the recess in plan view. The resin film covers the inner wall surface of the recess, and the upper surface of the flange part continuous to the inner wall surface. The lid material blocks the recess, and is on the upper surface with the resin film interposed therebetween. The lid material has a seal part stuck to the resin film. The seal part annularly extends along the flange part in plan view. In plan view, a first outer peripheral edge as the outer peripheral edge of the seal part is inside a second outer peripheral edge as the outer peripheral edge of the flange part. In plan view, a third outer peripheral edge as the outer peripheral edge of the resin film is overlapped with the second outer peripheral edge or is outside the second outer peripheral edge. In plan view, a fourth outer peripheral edge as the outer peripheral edge of the lid material is outside the third outer peripheral edge.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a tray. [Background technology]

[0002] For example, JP 2022-113623 A (Patent Document 1) describes a paper container with a lid material. The paper container with a lid material described in Patent Document 1 has a paper container, a molded film, and a lid material. The paper container has a side, a bottom, and a flange. The bottom is connected to the lower end of the side. The side and the bottom form a recess of the paper container. The flange protrudes in a ring shape from the upper end of the side (upper end of the recess) in a plan view. The molded film covers the inner wall surface of the recess and the upper surface of the flange connected to the inner wall surface. The lid material is disposed on the upper surface of the flange with the molded film interposed therebetween so as to cover the opening of the recess. In a plan view, the outer peripheral edge of the flange, the outer peripheral edge of the molded film, and the outer peripheral edge of the lid material overlap each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-113623 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a risk that the lid cannot be properly opened in the paper container with a lid described in Patent Document 1. More specifically, in the paper container with a lid described in Patent Document 1, it may be difficult to peel off the lid, or the lid may not be properly peeled off from the formed film (resulting in a double lid).

[0005] The present invention has been made in consideration of the above-mentioned problems of the conventional technology. More specifically, the present invention provides a tray whose lid can be appropriately opened. [Means for solving the problem]

[0006] The tray of the present invention comprises a paper blank, a resin film, and a lid. The blank has a recess and a flange. The flange protrudes from the upper end of the recess in a ring shape in a plan view. The resin film covers the inner wall surface of the recess and the upper surface of the flange connected to the inner wall surface. The lid closes the recess and is on the upper surface with the resin film interposed therebetween. The lid has a seal portion attached to the resin film. The seal portion extends in a ring shape along the flange portion in a plan view. In a plan view, a first outer peripheral edge that is the outer peripheral edge of the seal portion is located inside of a second outer peripheral edge that is the outer peripheral edge of the flange portion. In a plan view, a third outer peripheral edge that is the outer peripheral edge of the resin film is located outside of the first outer peripheral edge. In a plan view, a fourth outer peripheral edge that is the outer peripheral edge of the lid is located outside of the third outer peripheral edge. Effect of the Invention

[0007] According to the tray of the present invention, the lid material can be opened properly. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an exploded perspective view of the tray 100. [Diagram 2] FIG. 2 is a plan view of the tray 100. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a plan view of the blank 10 after assembly. [Diagram 5] FIG. 2 is a plan view of the blank 10 before assembly. [Figure 6] 2 is a schematic cross-sectional view of a resin film 20. FIG. [Figure 7] FIG. 2 is a cross-sectional view of the tray 100A. [Figure 8] FIG. 11 is a cross-sectional view of a tray 100B. [Figure 9] FIG. 13 is a cross-sectional view of the tray 100C. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numerals, and redundant description will not be repeated. The tray according to the embodiment is referred to as a tray 100.

[0010] (Configuration of tray 100) The configuration of the tray 100 will be described below.

[0011] Fig. 1 is an exploded perspective view of a tray 100. Fig. 2 is a plan view of the tray 100. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. As shown in Figs. 1 to 3, the tray 100 has a blank 10, a resin film 20, and a lid material 30.

[0012] The blank 10 has a recess 11 and a flange portion 12. The recess 11 is closed at its lower end and open at its upper end. The flange portion 12 is continuous with the upper end of the recess 11. The flange portion 12 protrudes in an annular shape from the upper end of the recess 11 in a plan view. More specifically, the flange portion 12 protrudes in a rectangular annular shape from the upper end of the recess 11 in a plan view.

[0013] The resin film 20 covers the inner wall surface of the recess 11 and the upper surface of the flange portion 12 connected to the inner wall surface. The lid material 30 is arranged on the upper surface of the flange portion 12 with the resin film 20 interposed therebetween so as to close the opening of the recess 11. The resin film 20 is placed on the blank 10 by placing the resin film 20 softened by heating so as to cover the inner wall surface of the recess 11 and the upper surface of the flange portion 12 and sucking the blank 10 from the outer wall surface side. The lid material 30 has a seal portion 31. The lid material 30 is bonded to the resin film 20 on the upper surface of the flange portion 12 at the seal portion 31. The seal portion 31 is formed by using, for example, a cup sealer. The seal portion 31 extends in a ring shape along the flange portion 12 in a plan view.

[0014] The outer peripheral edge of the seal portion 31 is the first outer peripheral edge. The outer peripheral edge of the flange portion 12 is the second outer peripheral edge. The outer peripheral edge of the resin film 20 is the third outer peripheral edge. The outer peripheral edge of the lid material 30 is the fourth outer peripheral edge. In a plan view, the first outer peripheral edge is located inside the second outer peripheral edge. In a plan view, the third outer peripheral edge is located outside the first outer peripheral edge. In a plan view, the third outer peripheral edge may overlap with the second outer peripheral edge. In a plan view, the third outer peripheral edge may be located outside the second outer peripheral edge. In a plan view, the fourth outer peripheral edge is located outside the third outer peripheral edge.

[0015] The distance between the first outer peripheral edge and the second outer peripheral edge in a plan view is a distance DIS1, and the distance between the second outer peripheral edge and the third outer peripheral edge in a plan view is a distance DIS2. The distance DIS1 is preferably 1 mm or more and 10 mm or less. The distance DIS2 is preferably 3 mm or less.

[0016] Fig. 4 is a plan view of the blank 10 after assembly. As shown in Fig. 4, the recess 11 is composed of a side wall 11a and a bottom wall 11b. The bottom wall 11b is continuous with the lower end of the side wall 11a. The bottom wall 11b closes the lower end of the recess 11. The flange portion 12 is continuous with the upper end of the side wall 11a.

[0017] Fig. 5 is a plan view of the blank 10 before assembly. As shown in Fig. 5, the blank 10 has, for example, a bottom panel 13 and a plurality of side panels 14. In the example shown in Fig. 5, the number of side panels 14 is four. The bottom panel 13 is rectangular (square) in plan view. A direction parallel to the sides of the bottom panel 13 is defined as a first direction, and a direction perpendicular to the first direction is defined as a second direction.

[0018] The side panel 14 has one end and the other end in the second direction. One end of the side panel 14 is connected to a side that forms the outer periphery of the bottom panel 13. The side panel 14 has a first portion 14a and a second portion 14b in the second direction. The first portion 14a is located on the one end side of the side panel 14, and the second portion 14b is located on the other end side of the side panel 14. The first portion 14a and the second portion 14b are connected to each other.

[0019] The width of the first portion 14a in the first direction increases with increasing distance from the side that forms the outer periphery of the bottom panel 13 along the second direction. That is, the first portion 14a is trapezoidal in plan view. The width of the second portion 14b in the first direction increases with increasing distance from the first portion 14a along the second direction. That is, the second portion 14b is trapezoidal in plan view. When the blank 10 is assembled, the bottom panel 13 forms the bottom wall 11b, the first portions 14a of the side panels 14 form the side walls 11a, and the second portions 14b of the side panels 14 form the flange portions 12. The blank 10 is assembled by sandwiching the blank 10 before assembly between male and female molds that conform to the shape of the blank 10 after assembly.

[0020] The blank 10 is made of paper. The paper constituting the blank 10 has a surface 10a and a surface 10b (see FIG. 3). Surface 10b is the opposite surface to surface 10a. Surfaces 10a and 10b are end surfaces in the thickness direction of the paper constituting the blank 10. Surface 10a forms, for example, the inner wall surface of the recess 11 and the upper surface of the flange portion 12. At least one of surfaces 10a and 10b is coated with clay.

[0021] The basis weight of the paper constituting the blank 10 is 100 g / m 2 More than 500g / m 2 The basis weight of the paper constituting the blank 10 is preferably 190 g / m 2 More than 400g / m 2It is more preferable that the number of layers of the paper constituting the blank 10 is 5 or more. It is preferable that the paper constituting the blank 10 contains a starch type as an interlayer strength agent.

[0022] Fig. 6 is a schematic cross-sectional view of the resin film 20. As shown in Fig. 6, the resin film 20 has a surface 20a and a surface 20b. The surface 20b is the surface opposite to the surface 20a. The surfaces 20a and 20b are end surfaces in the thickness direction of the resin film 20. The surface 20a is the surface that faces the blank 10 when the resin film 20 is attached to the blank 10.

[0023] The resin film 20 has an adhesive layer 21, a base layer 22, and a barrier layer 23. The adhesive layer 21 and the base layer 22 form a surface 20a and a surface 20b, respectively. The barrier layer 23 is disposed between the adhesive layer 21 and the base layer 22. An adhesive layer 24 is interposed between the adhesive layer 21 and the barrier layer 23 and between the base layer 22 and the barrier layer 23. The material of the adhesive layer 21 is, for example, any one of polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, and polyethylene terephthalate. The material of the base layer 22 is, for example, any one of polyethylene, polypropylene, and polyethylene terephthalate. The material of the barrier layer 23 is, for example, any one of ethylene-vinyl alcohol copolymer resin and barrier nylon resin.

[0024] The peel strength between the seal portion 31 and the resin film 20 is preferably 2.0 N / 15 mm or more and 8.0 N / 15 mm or less. The peel strength between the seal portion 31 and the resin film 20 is preferably 3.0 N / 15 mm or more and 6.0 N / 15 mm or less. The peel strength between the seal portion 31 and the resin film 20 is measured by the following method. First, a sample having a width of 15 mm is taken at the adhesive portion between the seal portion 31 and the resin film 20. Second, the peel strength of the sample taken as described above is measured using a Tensilon manufactured by A&D Co., Ltd.

[0025] When the resin film 20 is peeled off from the blank 10, it is preferable that the paper constituting the blank 10 be attached in an annular shape to the portion of the resin film 20 that was between the seal portion 31 and the flange portion 12.

[0026] When the resin film 20 is peeled off from the blank 10, the mass change rate (first change rate) of the portion of the resin film 20 that was between the seal portion 31 and the flange portion 12 before and after the peeling is preferably greater than the mass change rate (second change rate) of the portion of the resin film 20 that was not between the seal portion 31 and the flange portion 12 before and after the peeling. The first and second change rates are preferably equal to or greater than 1 percent and less than 1 percent, respectively. The first and second change rates are measured by the following method.

[0027] First, before being attached to the blank 10, the mass of the resin film 20 having the same dimensions as a test piece described later is measured in advance. Second, the resin film 20 is peeled off from the blank 10, and test pieces are cut out from the portion between the seal portion 31 and the flange portion 12 and the portion other than between the seal portion 31 and the flange portion 12. Third, the weight of the test piece is measured, and the first rate of change and the second rate of change are calculated based on the formula 100×(g−g0) / g0. Here, g0 is the mass of the resin film 20 having the same size as the test piece measured in advance, and g is the mass of the test piece.

[0028] When the resin film 20 is peeled off from the blank 10 without microwave heating, the visible light transmittance (first transmittance) of the portion of the resin film 20 between the seal portion 31 and the flange portion 12 before and after the peeling off by microwave heating is preferably 50% or more and 90% or less. When the resin film 20 is peeled off from the blank 10 after microwave heating, the visible light transmittance (second transmittance) of the portion of the resin film 20 between the seal portion 31 and the flange portion 12 before and after the peeling off by microwave heating is preferably 30% or more and 85% or less. The first transmittance and the second transmittance are measured using a U-3900 spectrophotometer manufactured by Hitachi, Ltd. At this time, scanning is performed at a scan speed of 300 nm / min in the wavelength range of 360 nm to 800 nm, and the first transmittance and the second transmittance are measured by calculating the area of ​​the spectrum. The microwave heating is performed under the condition of 600 W for 2 minutes.

[0029] (Effect of Tray 100) The effects of the tray 100 will be described below in comparison with a tray according to a comparative example.

[0030] The tray according to Comparative Example 1, the tray according to Comparative Example 2, and the tray according to Comparative Example 3 are designated as tray 100A, tray 100B, and tray 100C, respectively. Condition X is that the first outer peripheral edge is located more inward than the second outer peripheral edge in a plan view. Condition Y is that the third outer peripheral edge is located more outward than the first outer peripheral edge in a plan view. Condition Z is that the fourth outer peripheral edge is located more outward than the third outer peripheral edge in a plan view.

[0031] FIG. 7 is a cross-sectional view of the tray 100A. As shown in FIG. 7, in the tray 100A, the first outer peripheral edge overlaps with the second outer peripheral edge in a plan view, so that condition X is not satisfied. Except for this, the configuration of the tray 100A is common to the configuration of the tray 100. FIG. 8 is a cross-sectional view of the tray 100B. As shown in FIG. 8, in the tray 100B, the third outer peripheral edge is inside the first outer peripheral edge in a plan view, so that condition Y is not satisfied. Except for this, the configuration of the tray 100B is common to the configuration of the tray 100. FIG. 9 is a cross-sectional view of the tray 100C. As shown in FIG. 9, in the tray 100C, the fourth outer peripheral edge is inside the third outer peripheral edge (second outer peripheral edge), so that condition Z is not satisfied. Except for this, the configuration of the tray 100C is common to the configuration of the tray 100.

[0032] If condition X and condition Y are not met, the lid material 30 and the resin film 20 will be integrated due to the flow of the softened lid material 30 when forming the seal portion 31. Therefore, if condition X and condition Y are not met, when an attempt is made to peel off the lid material 30, the resin film 20 will also be peeled off together, which may result in a double lid. In addition, if condition Z is not met, it is difficult to pick up the lid material 30 by hand for peeling, which may cause problems in peeling off the lid material 30.

[0033] On the other hand, the tray 100 satisfies all of the conditions X, Y, and Z. Therefore, the tray 100 can prevent double lids from occurring due to the softened lid material 30 flowing in and can prevent problems with peeling the lid material 30 due to the difficulty in picking up the lid material 30 by hand, making it possible to properly open the lid material 30.

[0034] When the distance DIS1 is 1 mm or more and 10 mm or less, it is possible to more reliably prevent double closure caused by the flow of the softened lid material 30. Even if the fourth outer peripheral edge is located outside the third outer peripheral edge in a plan view, if the distance DIS2 is too large, the overlap between the lid material 30 and the resin film 20 is large, and even if an attempt is made to pinch only the lid material 30, the resin film 20 may also be pinched by mistake, resulting in double closure. Therefore, when the distance DIS2 is 3 mm or less, it is possible to prevent the resin film 20 from being pinched by mistake when opening the package.

[0035] The larger the first rate of change, the more firmly the resin film 20 is attached to the flange portion 12, making it easier to properly open the lid material 30 (less likely to form a double lid). On the other hand, if the second rate of change is too large, it becomes difficult to peel the resin film 20 from other than the flange portion 12, making it difficult to separate the blank 10 and the resin film 20 from other than the flange portion 12. Therefore, when the first rate of change is 1 percent or more and the second rate of change is less than 1 percent, it becomes possible to properly open the lid material 30 while ensuring the separability of the resin film 20 from the blank 10.

[0036] The greater the peel strength between the seal portion 31 and the resin film 20, the more secure the seal between the lid material 30 and the resin film 20. In other words, the lid material 30 is less likely to peel off from the resin film 20 during transportation. On the other hand, if the peel strength between the seal portion 31 and the resin film 20 is too large, when the lid material 30 is peeled off to open it, peeling may occur between the resin film 20 and the blank 10, resulting in a double lid. Therefore, when the peel strength between the seal portion 31 and the resin film 20 is 2.0 N / 15 mm or more and 8.0 N / 15 mm or less, it is possible to suppress the occurrence of a double lid while ensuring the sealing property between the lid material 30 and the resin film 20.

[0037] The larger the first transmittance (second transmittance), the more firmly the resin film 20 is attached to the flange portion 12, and the easier it is to properly open the lid material 30 (the less likely double lid will occur). On the other hand, if the first transmittance (second transmittance) is too large, a large amount of the paper component of the blank 10 remains in the resin film 20, making it difficult to wash and recycle the resin film 20 thereafter. When the first transmittance is 50 percent or more and 90 percent or less (the second transmittance is 30 percent or more and 85 percent or less), the recyclability of the resin film 20 is ensured and the lid material 30 can be properly opened.

[0038] (First test) Samples 1 to 24 were prepared to investigate the relationship between the satisfaction of Condition X, Condition Y, and Condition Z and the proper opening of the lid material 30. Details of Samples 1 to 24 are shown in Table 1. "A" in Table 1 is the distance between the first outer peripheral edge and the second outer peripheral edge. When the value of A is positive, the first outer peripheral edge is inside the second outer peripheral edge. When the value of A is 0, the first outer peripheral edge and the second outer peripheral edge overlap. "B" in Table 1 indicates the distance between the first outer peripheral edge and the third outer peripheral edge. When the value of B is positive, the third outer peripheral edge is outside the first outer peripheral edge, and when the value of B is 0, the first outer peripheral edge and the third outer peripheral edge overlap. When the value of B is negative, the third outer peripheral edge is inside the first outer peripheral edge. "C" in Table 1 is the distance between the fourth outer peripheral edge and the third outer peripheral edge. When the value of C is positive, the fourth outer peripheral edge is outside the third outer peripheral edge. When the value of C is 0, the third outer periphery and the fourth outer periphery overlap, and when the value of C is negative, the third outer periphery is located inside the fourth outer periphery.

[0039] An evaluation of openability was carried out for Samples 1 to 24. Samples that had no problems with openability are indicated as "OK" in the openability column in Table 1. On the other hand, samples that had problems with openability are indicated in the openability column with the cause of the openability problem (double lid, unopenable).

[0040] [Table 1]

[0041] As shown in Table 1, Samples 1 to 18 met all of Conditions X to Z. On the other hand, Samples 19 to 24 did not meet at least one of Conditions X to Z. Samples 1 to 18 had no problems with openability. Samples 19 to 24 had problems with being unable to open or being able to open. From these comparisons, it was experimentally shown that the lid material 30 can be properly opened by meeting all of Conditions X to Z.

[0042] (Second Exam) Samples 25 to 52 were prepared in order to investigate the relationship between the first transmittance and the second transmittance and the separability and cleanability of the resin film 20. In Samples 25 to 52, the first transmittance and the second transmittance were changed as shown in Table 2.

[0043] [Table 2]

[0044] In Samples 25 to 48, the first transmittance was within the range of 50% to 90% and the second transmittance was within the range of 30% to 85%. On the other hand, in Samples 49 to 52, either the first transmittance being within the range of 50% to 90% or the second transmittance being within the range of 30% to 85% was not satisfied. In Samples 25 to 48, there was no problem with separation or cleaning of the resin film 20 (represented as "OK" in Table 2). On the other hand, in Samples 49 to 52, too much of the paper constituting the blank 10 remained on the peeled resin film 20, causing problems with separation or cleaning of the resin film 20 (represented as "NG" in Table 2).

[0045] From this comparison, it was experimentally shown that by setting the first transmittance within the range of 50 percent or more and 90 percent or less and the second transmittance within the range of 30 percent or more and 85 percent or less, the separability and washability of the resin film 20 are ensured, and as a result, the recyclability of the resin film 20 is ensured.

[0046] (Third Test) Samples 53 to 80 were prepared to investigate the relationship between the peel strength between the seal portion 31 and the resin film 20 and the openability and transport suitability of the lid material 30. As shown in Table 3, the peel strength between the seal portion 31 and the resin film 20 was changed in Samples 53 to 80. Note that, with reference to JIS Z 2020, the transport suitability was evaluated by placing 200 g of water in the recess 11 to which the resin film 20 was attached, sealing the lid material 30, and then conducting a drop and vibration test to check for leakage of the water content.

[0047] [Table 3]

[0048] In samples 53 to 78, the peel strength between the seal portion 31 and the resin film 20 was within the range of 2.0 N / 15 mm or more and 8.0 N / 15 mm or less. In samples 79 and 80, the peel strength between the seal portion 31 and the resin film 20 was not within the range of 2.0 N / 15 mm or more and 8.0 N / 15 mm or less. In samples 53 to 78, there was no problem with the openability (marked as "OK" in Table 3) and no problem with the transport suitability (there was no leakage of the water content). On the other hand, in sample 79, there was no problem with the transport suitability, but there was a problem with the double lid. Also, in sample 80, there was no problem with the openability, but there was a problem with the transport suitability (leakage of the contents was confirmed).

[0049] From this comparison, it was experimentally shown that by setting the peel strength between the sealing portion 31 and the resin film 20 within the range of 2.0 N / 15 mm or more and 8.0 N / 15 mm or less, it is possible to prevent the occurrence of double lids while ensuring the sealing property between the lid material 30 and the resin film 20 (while ensuring suitability for transportation).

[0050] (4th test) In order to investigate the relationship between the first rate of change and the second rate of change and the peelability of the resin film 20 from the blank 10, samples 83 to 110 were prepared. In samples 81 to 108, the first rate of change and the second rate of change were changed as shown in Table 4. In the fourth test, the peeling state in the flange portion 12 and the peeling state other than the flange portion 12 were evaluated. If cohesive peeling of paper or peeling of paper occurred in the flange portion 12, the peeling state in the flange portion 12 was evaluated as "OK", and if not, the peeling state in the flange portion 12 was evaluated as "NG". If cohesive peeling of paper or peeling of paper occurred in the portion other than the flange portion 12, the peeling state in the portion other than the flange portion 12 was evaluated as "NG", and otherwise the peeling state in the portion other than the flange portion was evaluated as "OK".

[0051] [Table 4]

[0052] In Samples 81 to 106, the first rate of change was 1 percent or more and the second rate of change was less than 1 percent. In Sample 107, the first rate of change was less than 1 percent, and in Sample 108, the second rate of change was 1 percent or more. In Samples 81 to 106, there was no problem with the peeling state at the flange portion 12 and the peeling state other than the flange portion 12. On the other hand, in Sample 107, there was a problem with the peeling state at the flange portion 12, and in Sample 108, there was a problem with the peeling state other than the flange portion 12. From this comparison, it was experimentally shown that when the first rate of change is 1 percent or more and the second rate of change is less than 1 percent, it is possible to ensure the separability of the resin film 20 from the blank 10 while allowing the lid material 30 to be properly opened.

[0053] (Additional Note) The above embodiment includes the following configurations.

[0054] <Appendix 1> Paper blanks and A resin film; and a lid material. The blank has a recess and a flange portion, The flange portion protrudes in an annular shape in a plan view from an upper end of the recess, the resin film covers an inner wall surface of the recess and an upper surface of the flange portion connected to the inner wall surface, the lid member closes the recess and is on the upper surface with the resin film interposed therebetween; The lid member has a seal portion attached to the resin film, The seal portion extends annularly along the flange portion in a plan view, In a plan view, a first outer circumferential edge that is an outer circumferential edge of the seal portion is located inside a second outer circumferential edge that is an outer circumferential edge of the flange portion, In a plan view, a third outer peripheral edge which is an outer peripheral edge of the resin film is located outside the first outer peripheral edge, A tray, wherein in a plan view, a fourth outer peripheral edge which is the outer peripheral edge of the lid material is located outside the third outer peripheral edge.

[0055] <Appendix 2> A distance between the first outer peripheral edge and the second outer peripheral edge in a plan view is 1 mm or more and 10 mm or less; The tray of claim 1, wherein the distance between the second outer peripheral edge and the third outer peripheral edge in a planar view is 3 mm or less.

[0056] <Appendix 3> 3. The tray according to claim 1, wherein the peel strength between the seal portion and the resin film is 2.0 N / 15 mm or more and 8.0 N / 15 mm or less.

[0057] <Appendix 4> 4. The tray according to any one of claims 1 to 3, wherein the peel strength between the seal portion and the resin film is 3.0 N / 15 mm or more and 6.0 N / 15 mm or less.

[0058] <Appendix 5> The basis weight of the paper is 100 g / m 2 More than 500g / m 2 5. A tray according to any one of claims 1 to 4, wherein:

[0059] <Appendix 6> The basis weight of the paper is 190 g / m 2 More than 400g / m 2 6. The tray of claim 1, wherein:

[0060] <Appendix 7> the paper has a first surface and a second surface opposite the first surface; 7. The tray of any one of claims 1 to 6, wherein at least one of the first surface and the second surface is coated with clay.

[0061] <Appendix 8> The resin film has a third surface facing the blank and a fourth surface opposite the third surface, 8. The tray of claim 1, wherein the resin film has an adhesive layer forming the third surface, a base layer forming the fourth surface, and a barrier layer between the adhesive layer and the base layer.

[0062] <Appendix 9> The adhesive layer is made of any one of polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, and polyethylene terephthalate. The base layer is made of any one of polyethylene, polypropylene, and polyethylene terephthalate. The tray according to claim 8, wherein the material constituting the barrier layer is either an ethylene-vinyl alcohol copolymer resin or a barrier nylon resin.

[0063] <Appendix 10> when the resin film is peeled off from the blank, a first rate of change which is a rate of mass change in a portion of the resin film between the seal portion and the flange portion before and after peeling is greater than a second rate of change which is a rate of mass change in a portion of the resin film other than between the seal portion and the flange portion before and after peeling, 10. The tray of any one of claims 1 to 9, wherein the first rate of change and the second rate of change are greater than or equal to 1 percent and less than 1 percent, respectively.

[0064] <Appendix 11> When the resin film is peeled off from the blank without being heated in a microwave oven, the visible light transmittance of the portion of the resin film between the seal portion and the flange portion is 50% or more and 90% or less; A tray as described in any one of Appendix 1 to Appendix 10, wherein when the resin film is peeled off from the blank after heating in a microwave oven, the visible light transmittance of the portion of the resin film between the seal portion and the flange portion is 30 percent or more and 85 percent or less.

[0065] Although the embodiment of the present invention has been described above, the above embodiment can be modified in various ways. The scope of the present invention is not limited to the above embodiment. The scope of the present invention is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0066] 10 blank, 10a, 10b surface, 11 recess, 11a side wall, 11b bottom wall, 12 flange portion, 13 bottom panel, 14 side panel, 14a first portion, 14b second portion, 20 resin film, 20a, 20b surface, 21 adhesive layer, 22 base layer, 23 barrier layer, 24 adhesive layer, 30 lid material, 31 seal portion, 100, 100A, 100B, 100C tray, DIS1, DIS2 distance.

Claims

1. Paper blanks and A resin film; and a lid material. The blank has a recess and a flange portion, The flange portion protrudes in an annular shape in a plan view from an upper end of the recess, the resin film covers an inner wall surface of the recess and an upper surface of the flange portion connected to the inner wall surface, the lid member closes the recess and is on the upper surface with the resin film interposed therebetween; The lid member has a seal portion attached to the resin film, The seal portion extends annularly along the flange portion in a plan view, In a plan view, a first outer circumferential edge that is an outer circumferential edge of the seal portion is located inside a second outer circumferential edge that is an outer circumferential edge of the flange portion, In a plan view, a third outer peripheral edge that is an outer peripheral edge of the resin film is located outside the first outer peripheral edge, A tray, wherein in a plan view, a fourth outer peripheral edge which is the outer peripheral edge of the lid material is located outside the third outer peripheral edge.

2. a distance between the first outer circumferential edge and the second outer circumferential edge in a plan view is 1 mm or more and 10 mm or less; The tray according to claim 1 , wherein a distance between the second outer peripheral edge and the third outer peripheral edge in a plan view is 3 mm or less.

3. The tray according to claim 1 , wherein a peel strength between the seal portion and the resin film is 2.0 N / 15 mm or more and 8.0 N / 15 mm or less.

4. The tray according to claim 1 , wherein a peel strength between the seal portion and the resin film is 3.0 N / 15 mm or more and 6.0 N / 15 mm or less.

5. The basis weight of the paper is 100 g / m ２ More than 500g / m ２ 2. The tray of claim 1, wherein:

6. The basis weight of the paper is 190 g / m ２ More than 400g / m ２ 2. The tray of claim 1, wherein:

7. the paper has a first surface and a second surface opposite the first surface; 2. The tray of claim 1, wherein at least one of the first surface and the second surface is coated with a clay coating.

8. The resin film has a third surface facing the blank and a fourth surface opposite the third surface, 2. The tray of claim 1, wherein the resin film has an adhesive layer on the third surface, a base layer on the fourth surface, and a barrier layer between the adhesive layer and the base layer.

9. The adhesive layer is made of any one of polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, and polyethylene terephthalate. The base layer is made of any one of polyethylene, polypropylene, and polyethylene terephthalate.

9. The tray according to claim 8, wherein the material constituting the barrier layer is either an ethylene-vinyl alcohol copolymer resin or a barrier nylon resin.

10. when the resin film is peeled off from the blank, a first rate of change which is a rate of mass change in a portion of the resin film between the seal portion and the flange portion before and after peeling is greater than a second rate of change which is a rate of mass change in a portion of the resin film other than between the seal portion and the flange portion before and after peeling, 2. The tray of claim 1, wherein the first rate of change and the second rate of change are greater than or equal to 1 percent and less than 1 percent, respectively.

11. When the resin film is peeled off from the blank without being heated in a microwave oven, the visible light transmittance of the portion of the resin film between the seal portion and the flange portion is 50% or more and 90% or less; A tray as described in any one of claims 1 to 10, wherein when the resin film is peeled off from the blank after heating in a microwave oven, the visible light transmittance of the portion of the resin film between the seal portion and the flange portion is 30 percent or more and 85 percent or less.

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