JP6661956B2 - Storage container - Google Patents

Description

  The present invention relates to a storage container made of a resin sheet having an oxygen absorbing layer.

  A conventional storage container is disclosed in Patent Document 1. This storage container is formed from a resin sheet in which a base material layer is laminated on both sides of an oxygen absorbing layer containing iron powder, and the resin sheet includes a base material layer, an oxygen absorbing layer, an adhesive layer, a barrier layer, an adhesive layer, and a base material. The layers are sequentially stacked from the inside to the outside of the storage container. The storage container is provided with a storage portion that has an opening on the upper surface to store the contents and an annular flange portion that protrudes outward from the periphery of the opening. A thin portion, which is thinner than the inner peripheral portion, is formed at the outer peripheral end of the flange portion by pressing the resin sheet.

  After the contents are stored in the storage section through the opening, the opening is sealed with a film having gas barrier properties. Oxygen remaining in the storage portion at the time of storing the contents and oxygen transmitted from the outside through the base material layer on the outer surface of the resin sheet are absorbed by the oxygen absorbing layer. As a result, quality deterioration of the contents due to oxygen can be prevented. In addition, the thin portion makes it difficult for the iron powder to be visually recognized on the end face on the outer peripheral side of the flange portion, so that the appearance of the storage container can be improved.

Japanese Patent No. 3838289 (page 4, page 5, FIG. 2, FIG. 4)

  However, according to the conventional container described above, there is a case where the adhesive strength cannot be obtained because the adhesive layer of the thin portion is thin. For this reason, delamination occurs between the barrier layer and the oxygen absorbing layer, and the yield of the storage container is reduced.

  An object of the present invention is to provide a storage container that can improve the yield.

In order to achieve the above object, the present invention provides a resin sheet having a metal-containing oxygen-absorbing layer, an opening on the upper surface for storing contents, and a peripheral edge of the opening. A storage container having an annular flange portion protruding from
A first thin portion having a thickness equal to or less than a thickness of an inner peripheral portion and a second thin portion which is thinner than the first thin portion are provided alternately in a circumferential direction at an end on the outer peripheral side of the flange portion. I have.

  According to this configuration, the content is stored in the storage section through the opening, and the opening is sealed with, for example, a seal member. Oxygen remaining in the storage portion at the time of storing the contents or oxygen transmitted from the outside through the base material layer on the outer surface of the resin sheet or the like is absorbed by the oxygen absorbing layer.

  Further, according to the present invention, in the storage container having the above configuration, it is preferable that the second thin portion is disposed at a lower end portion of the flange portion.

  Further, according to the present invention, in the storage container having the above-described configuration, the first thin portion protrudes below the lower surface of the inner peripheral portion, and the lower portion of the first thin portion is located closer to a boundary between the inner peripheral portion and the second thin portion. It is preferable to extend on the inner peripheral side.

  Further, according to the present invention, in the storage container having the above configuration, it is preferable that the thickness of the second thin portion is 20% or less of the thickness of the inner peripheral portion.

  Further, according to the present invention, in the storage container having the above configuration, it is preferable that the circumferential width of the second thin portion is smaller than 2 mm.

  Further, according to the present invention, in the storage container having the above configuration, it is preferable that a circumferential width of the first thin portion is not less than ４ and not more than の of a cycle of the first thin portion.

  Further, according to the present invention, in the storage container having the above configuration, it is preferable that a main component of a front surface portion and a back surface portion of the resin sheet is polypropylene.

  According to the present invention, the first thin portion having a thickness equal to or less than the thickness of the inner peripheral portion at the outer peripheral end of the flange portion formed by the resin sheet having the oxygen absorbing layer and the first thin portion having a thickness smaller than the first thin portion are provided. Two thin portions are provided alternately in the circumferential direction. Thereby, delamination of the resin sheet can be prevented. Therefore, the yield of the storage container can be improved.

1 is a perspective view of a storage container according to a first embodiment of the present invention. Partial sectional view of the front of the storage container according to the first embodiment of the present invention. The bottom view of the storage container of the first embodiment of the present invention Sectional drawing along the circumferential direction of the outer peripheral side end of the flange portion of the storage container according to the first embodiment of the present invention. Sectional drawing along the radial direction of the flange part of the 1st thin part of the storage container of 1st Embodiment of this invention Sectional drawing along the radial direction of the flange part of the 2nd thin part of the storage container of 1st Embodiment of this invention Sectional drawing of the resin sheet used for the storage container of 1st Embodiment of this invention The figure which shows the manufacturing process of the storage container of 1st Embodiment of this invention. The side view which shows the manufacturing process of the storage container of 1st Embodiment of this invention. Side sectional view of a first mold, a second mold, and a third mold used in the manufacturing process of the storage container according to the first embodiment of the present invention. The bottom view of the 1st metal mold used in the manufacturing process of the storage container of a 1st embodiment of the present invention. Sectional side view which shows the groove part formation process of the storage container of 1st Embodiment of this invention. Sectional side view which shows the storage part formation process of the storage container of 1st Embodiment of this invention. Partial sectional view of the front of a storage container according to a second embodiment of the present invention. Sectional drawing along the circumferential direction of the outer peripheral end of the flange portion of the storage container according to the second embodiment of the present invention. Sectional drawing along the radial direction of the flange part of the 1st thin part of the storage container of 2nd Embodiment of this invention Sectional drawing along the radial direction of the flange part of the 2nd thin part of the storage container of 2nd Embodiment of this invention

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a storage container 1 according to one embodiment of the present invention. The storage container 1 is formed of a resin sheet 100 (see FIG. 7), and has a storage portion 2 and a flange portion 3. The horizontal cross-sectional shape of the storage container 1 is circular, and the diameter of the upper surface of the storage container 1 is formed to be about 83 mm. Note that the horizontal cross-sectional shape of the storage container 1 is not limited to a circle, and may be, for example, an elliptical shape or a substantially polygonal shape.

  The storage unit 2 has an opening 4 on the upper surface, and stores contents (not shown) therein. The diameter of the opening 4 is formed to be about 72 mm. The contents are not particularly limited, and include, for example, foods, beverages, and pharmaceuticals.

  The flange portion 3 is formed in an annular shape protruding outward from the peripheral edge of the opening 4 and surrounds the opening 4. The shape of the ring is not limited to a circle, but may be an ellipse, a substantially polygon, or the like. A step portion 31 disposed below the upper surface of the inner peripheral portion 32 is provided at an outer peripheral end of the flange portion 3. The step portion 31 is formed to be thinner than the inner peripheral portion 32 by the first thin portion 31a (see FIG. 2) and the second thin portion 31b (see FIG. 2).

  After storing the contents in the storage portion 2, the storage container 1 is hermetically sealed by thermally bonding the peripheral portion of the lid portion 20 to the upper surface of the inner peripheral portion 32 of the flange portion 3. Thereafter, the storage container 1 may be subjected to boil sterilization or retort sterilization. The oxygen remaining in the storage section 2 when the contents are stored is absorbed by the oxygen absorbing layer 12 (see FIG. 7). Oxygen that has passed through the base material layer 16 (see FIG. 7) from the outside of the storage section 2 is blocked from entering the inside of the storage section 2 by the barrier layer 14 (see FIG. 7). Thereby, the oxidation of the contents by oxygen is suppressed, and the quality deterioration of the contents is prevented.

  The lid portion 20 is formed of a resin sheet in which a base material layer, a printing layer, a barrier layer, and an adhesive layer are sequentially laminated from the front side. The substrate layer is not particularly limited as long as it can be printed. For example, polyethylene terephthalate, polypropylene, or nylon is used. As the barrier layer, for example, a polyethylene terephthalate film, a nylon film, or an aluminum foil on which an organic oxide or an inorganic oxide is deposited is used, and is appropriately selected depending on the performance. The adhesive layer is not particularly limited as long as it adheres to the storage container 1. For example, a multilayer film of a polyolefin-based easy peel film is used.

  FIG. 2 is a partial cross-sectional view of the front of the storage container 1, and FIG. 3 is a bottom view of the storage container 1. A recess 8 is formed on the bottom surface of the storage section 2 and is recessed upward. A plurality of first thin portions 31a and a plurality of second thin portions 31b thinner than the first thin portion 31a are alternately arranged in the circumferential direction of the flange portion 3 on the step portion 31 at the outer peripheral end of the flange portion 3. It is provided in.

  FIG. 4 shows a sectional view of the step portion 31 along the circumferential direction. FIGS. 5 and 6 are cross-sectional views of the first thin portion 31a and the second thin portion 31b along the radial direction, respectively.

  The first thin portions 31a are arranged at a predetermined period P (about 2 mm in the present embodiment) in the circumferential direction of the flange portion 3. The thickness T1 of the first thin portion 31a is smaller than the thickness T3 of the inner peripheral portion 32 of the flange portion 3. That is, the first thin portion 31 a is formed thinner than the inner peripheral portion 32. In the present embodiment, the thickness T1, the circumferential width W1, and the radial width L1 of the first thin portion 31a are about 0.5 mm, 1 mm, and 1.2 mm, respectively. The first thin portions 31a may be formed at intervals in the circumferential direction, and the arrangement intervals of the first thin portions 31a may not be equal.

  The second thin portion 31b is provided between the adjacent first thin portions 31a. The thickness T2 of the second thin portion 31b is smaller than the thickness T1 of the first thin portion 31a. That is, the second thin portion 31b is formed to be thinner than the first thin portion 31a. In the present embodiment, the thickness T2, the circumferential width W2, and the radial width L2 of the second thin portion 31b are about 0.2 mm, 1 mm, and 1.2 mm, respectively.

  The second thin portion 31 b is arranged at a lower end of the flange 3. The first thin portion 31a protrudes below the lower surface 32b of the inner peripheral portion 32, and an extended portion 32c extending from the first thin portion 31a into the inner peripheral portion 32 is provided at a lower end of the inner peripheral portion 32. . That is, the lower portion of the first thin portion 31a extends to the inner circumferential side from the boundary between the inner circumferential portion 32 and the second thin portion 31b. Thereby, it is possible to secure substantially the same thickness as that of the first thin portion 31a at the boundary between the inner peripheral portion 32 and the first thin portion 31a, and to separate the interlayer sheet of the resin sheet 100 (see FIG. 7) described later at the boundary. Can be prevented. In the present embodiment, the radial width L3 of the extension 32c is about 0.3 mm.

  FIG. 7 shows a cross-sectional view of the resin sheet 100 forming the storage container 1. In the resin sheet 100, a base layer 11, an oxygen absorbing layer 12, an adhesive layer 13, a barrier layer 14, an adhesive layer 15, and a base layer 16 are sequentially stacked from the inside to the outside of the storage section 2.

  The base layer 11 is formed of, for example, a polypropylene film having a thickness of about 250 μm. The base layer 16 is formed of, for example, a polypropylene film having a thickness of about 450 μm. Since the main components of the front and back portions of the resin sheet 100 are polypropylene, the heat resistance of the storage container 1 can be improved. The oxygen absorbing layer 12 is formed of, for example, a polypropylene film having a thickness of about 150 μm, and contains an oxygen scavenger composition mainly composed of a granular metal (eg, iron). The base material layer 11 and the oxygen absorbing layer 12 are laminated by co-extrusion or the like. Note that two or more oxygen absorbing layers 12 may be provided.

  The barrier layer 14 is formed of, for example, an ethylene vinyl alcohol copolymer (EVOH, manufactured by Kuraray Co., Ltd.) having a thickness of about 100 μm, and blocks entry of oxygen into the storage section 2. The barrier layer 14 is not limited to EVOH, and may be any material having a barrier property such as nylon or polyvinyldene chloride. The oxygen absorption layer 12 and the barrier layer 14 are bonded by the bonding layer 13. The base layer 16 and the barrier layer 14 are adhered by the adhesive layer 15. The adhesive layers 13 and 15 are formed to a thickness of about 25 μm, for example.

  Thereby, the thickness of the resin sheet 100 of the present embodiment is about 1 mm. In the present embodiment, the thicknesses T1 and T2 of the first thin portion 31a and the second thin portion 31b are set to 0.5 mm and 0.2 mm, respectively. Therefore, the thickness of the oxygen absorbing layer 12 in the first thin portion 31a is about 75 μm, and the thickness of the adhesive layers 13 and 15 is about 12.5 μm. The thickness of the oxygen absorbing layer 12 in the second thin portion 31b is about 30 μm, and the thickness of the adhesive layers 13 and 15 is about 5 μm.

  If the thickness of the step portion 31 is smaller, the oxygen absorbing layer 12 can be made thinner, so that the metal can be made less noticeable. However, when the thickness of the step portion 31 is extremely small, the adhesive layers 13 and 15 become too thin, and the adhesive strength cannot be obtained. As a result, delamination occurs between the barrier layer 14 and the oxygen absorbing layer 12 and between the barrier layer 14 and the base layer 16.

  Further, when the thickness of the step portion 31 becomes extremely small, the outer peripheral end surface becomes sharp, and there is a possibility that the finger or the like of the user may be torn. Therefore, by providing a plurality of first thin portions 31a thicker than the second thin portions 31b at the step portions 31 at intervals, it is possible to prevent delamination of the resin sheet 100 and to avoid the risk of tearing. Can be.

  Note that the circumferential width W2 of the second thin portion 31b is preferably set to 2 mm or less. Thereby, the tear by the outer peripheral end surface of the second thin portion 31b can be prevented. If the width W1 of the first thin portion 31a in the circumferential direction is less than 1/4 of the period P of the first thin portion 31a, it is difficult to prevent delamination. On the other hand, when the width W1 exceeds １ ／ of the period P, the metal exposed on the end face of the first thin portion 31a is easily recognized. For this reason, it is desirable that the width W1 be set to 以上 or more and 周期 or less of the period P, since the appearance of the storage container 1 can be improved while preventing delamination of the resin sheet 100.

  When the thickness T2 of the second thin portion 31b is 20% or less of the thickness T3 of the inner peripheral portion 32, the metal of the oxygen absorbing layer 12 on the outer peripheral end face of the step portion 31 is more reliably prevented from being visually recognized. It is desirable because it can be.

  FIG. 8 is a diagram illustrating a manufacturing process of the storage container 1. The storage container 1 is formed by sequentially performing the groove forming step, the storing section forming step, and the cutting step.

  FIG. 9 shows a side view of the manufacturing apparatus 200 for the storage container 1. The manufacturing apparatus 200 sequentially performs a groove forming step, a housing forming step, and a cutting step.

  The manufacturing apparatus 200 has rollers 70 and 80 for conveying the resin sheet 100. The roller 70 is attached with a roll-shaped resin sheet 100 before processing, and the roller 80 winds up the processed resin sheet 100 (scrap) from which the storage container 1 is punched. When the roller 80 rotates counterclockwise in the drawing and the roller 70 rotates clockwise in the drawing, the resin sheet 100 is pulled out in the direction of the arrow DR.

  A forming section 50 and a punching section 60 are arranged between the rollers 70 and 80. In the forming section 50, the upper heater 54 and the lower heater 55 are arranged on the upstream side in the drawing direction (arrow DR) of the resin sheet 100, and the first mold 51, the second mold 52 (see FIG. 10) and the The third mold 53 is arranged. The forming section 50 performs a groove section forming step and a storage section forming step.

  The upper heater 54 and the lower heater 55 are formed in a flat plate shape, and a predetermined gap is provided between the upper heater 54 and the lower heater 55. The upper and lower surfaces of the resin sheet 100 are heated by the resin sheet 100 drawn from the roller 70 entering this gap.

  The first mold 51 is arranged above the resin sheet 100, and the second mold 52 and the third mold 53 are arranged below the resin sheet 100.

  The punching section 60 has a cutting blade (not shown) and cuts the resin sheet 100 from above. A cutting step is performed by the punching unit 60.

  FIG. 10 is a side sectional view of the first mold 51, the second mold 52, and the third mold 53. FIG. 11 shows a bottom view of the first mold 51. The first mold 51 has a first recess 51a and a plurality of second recesses 51b formed on a flat surface 51c. The first recess 51 a has the outer shape of the storage section 2 of the storage container 1. The plurality of second concave portions 51b are arranged at predetermined positions (about 2 mm in the present embodiment) in the circumferential direction of the outer periphery of the first concave portions 51a at positions facing the later-described protrusions 52a. Further, a plurality of exhaust ports (not shown) communicating with a vacuum pump (not shown) are provided at the outer peripheral end of the second concave portion 51b.

  The second mold 52 has a flat projection 51a facing the flat surface 51c and the second recess 51b of the first mold 51 and having an annular shape in plan view. The second mold 52 is configured to be able to move up and down, and moves forward and backward in a direction perpendicular to the flat surface 51c. Further, the inner peripheral end of the second concave portion 51b of the first mold 51 is disposed on the inner peripheral side with respect to the inner peripheral end of the projection 52a.

  In addition, the second mold 52 has a pressing portion 52d that is annular in plan view outside the radial direction of the protruding portion 52a. The pressing portion 52d is configured to be able to move up and down, and moves forward and backward in a direction orthogonal to the flat surface 51c.

  The third mold 53 has a protrusion 53a. The convex part 53a has an upper part and a lower part formed in a truncated cone shape and a cylindrical shape, respectively, and moves up and down with respect to the pressing part 52d to advance and retreat in a direction orthogonal to the flat surface 51c. When the convex portion 53a rises, it enters the first concave portion 51a, and when it descends, it retracts from the first concave portion 51a.

  The first mold 51 and the third mold 53 are respectively provided with a plurality of (25 in 5 rows × 5 columns in this embodiment) first concave portions 51a and convex portions 53a. Can be molded.

  The upper and lower surfaces of the resin sheet 100 pulled out from the roller 70 in the direction of the arrow DR are heated to about 155 ° C. to 170 ° C. by the upper heater 54 and the lower heater 55 to perform a groove forming step.

  FIG. 12 is a side sectional view showing a groove forming step. In the groove forming step, the second mold 52 moves in the direction approaching the first mold 51 (upward) to sandwich the resin sheet 100 between the protrusion 52a and the flat surface 51c. At this time, the pressing portion 52d moves upward to press the resin sheet 100 against the flat surface 51c of the first mold 51. When the protrusion 52a presses the resin sheet 100, a thin annular groove 30 (not shown) is recessed on the resin sheet 100. At this time, the first thin portion 31a is formed by the second concave portion 51b, and the second thin portion 31b is formed between the adjacent first thin portions 31a.

  Since the inner peripheral end of the second concave portion 51b is disposed closer to the inner peripheral side than the inner peripheral end of the projection 52a, the inner peripheral portion 32 (extended portion 32c) of the flange portion 3 is the second peripheral portion as shown in FIG. The recess 51b extends from the first thin portion 31a to be formed thick. This prevents the boundary between the step portion 31 and the inner peripheral portion 32 from being formed with the thickness of the second thin portion 31b over the entire circumference, and the thickness substantially equal to that of the first thin portion 31a is secured at a predetermined cycle. .

  After a lapse of a predetermined time (about one second in the present embodiment) after the completion of the groove portion forming step, the housing portion forming step is performed. FIG. 13 is a side cross-sectional view showing a storage section forming step. In the housing portion forming step, the convex portion 53a moves upward and enters the first concave portion 51a, and the resin sheet 100 is pushed into the first concave portion 51a. Then, the resin sheet 100 is suctioned from an exhaust port (not shown) by a vacuum pump to evacuate the resin sheet 100 to the surface of the first mold 51, so that the storage section 2 is formed on the inner peripheral side of the groove 30.

  In the cutting step, the resin sheet 100 is cut in an annular shape on the groove 30 by the cutting blade of the punching unit 60. As a result, the flange 3 is formed between the cut surface 35 (see FIG. 2) and the opening 4, and the storage container 1 is formed. The formed plurality of storage containers 1 are stacked with the opening 4 downward.

  At this time, as shown in FIG. 5, the cutting blade descends and the flange portion 3 is cut in the direction of arrow E. For this reason, the step portion 31 may be bent in the direction of the upper surface of the flange portion 3 as shown by the dashed line D in some cases. Since the step portion 31 is formed below the upper surface of the flange portion 3, it does not project from the upper surface of the flange portion 3 even if it is bent upward in the cutting step. Accordingly, when the lid 20 (see FIG. 1) is thermally bonded, interference between the lid 20 and the step 31 can be prevented, and poor thermal bonding of the lid 20 can be prevented.

  In addition, in the accommodation part forming step, the accommodation part 2 may be formed by air pressure molding or vacuum air pressure molding. In this case, compressed air is sent from the third mold 53 side to the first mold 51 to bring the resin sheet 100 into close contact with the surface of the first mold 51.

  According to the present embodiment, the first thin portion 31a thinner than the inner circumferential portion 32 and the first thin portion 31a at the outer peripheral end of the flange portion 3 formed by the resin sheet 100 having the oxygen absorbing layer 12 are formed. Also, thin second thin portions 31b are alternately provided in the circumferential direction. Thereby, delamination of the resin sheet 100 can be prevented while improving the appearance of the storage container 1. Therefore, the yield of the storage container 1 can be improved. Further, it is possible to avoid the risk of tearing of a finger or the like due to the outer peripheral end surface of the step portion 31. The thickness T1 of the first thin portion 31a may be the same as the thickness T3 of the inner peripheral portion 32. Even in this case, delamination of the resin sheet 100 can be prevented.

  Further, a second thin portion 31 b is provided at a lower end portion of the flange portion 3. Thereby, even if the step portion 31 is bent upward in the cutting step, it does not project from the upper surface of the flange portion 3. Thus, when the lid 20 is thermally bonded to the upper surface of the inner peripheral portion 32, interference between the lid 20 and the step portion 31 can be prevented, and poor thermal bonding of the lid 20 can be prevented.

  Further, since the first thin portion 31a protrudes below the lower surface 32b of the inner peripheral portion 32, when the lid portion 20 is thermally bonded to the upper surface of the inner peripheral portion 32, the interference between the lid portion 20 and the step portion 31 occurs. Can be further prevented.

  An extended portion 32c extending from the first thin portion 31a to the inner peripheral portion 32 is provided at a lower end portion of the inner peripheral portion 32. This prevents the boundary between the step portion 31 and the inner peripheral portion 32 from being formed with the thickness of the second thin portion 31b over the entire circumference, and the thickness substantially equal to that of the first thin portion 31a is secured at a predetermined cycle. .

  When the thickness T2 of the second thin portion 31b is 20% or less of the thickness T3 of the inner peripheral portion 32, the metal of the oxygen absorbing layer 12 on the outer peripheral end face of the step portion 31 is more reliably prevented from being visually recognized. be able to.

  Further, when the circumferential width W2 of the second thin portion 31b is smaller than 2 mm, it is possible to reliably prevent the outer thin end portion 31b from being torn by the outer peripheral end face.

  When the circumferential width W1 of the first thin portion 31a is not less than ４ and not more than の of the period P of the first thin portion 31a, the appearance of the storage container 1 is prevented while preventing delamination of the resin sheet 100. Can be further improved.

  In addition, since the main components of the front and back portions of the resin sheet 100 are polypropylene, the heat resistance of the storage container 1 can be improved.

<Second embodiment>
Next, a second embodiment of the present invention will be described. FIG. 14 is a partial cross-sectional view of the front of the storage container according to the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 13 are denoted by the same reference numerals. In the present embodiment, the arrangement of the first thin portion 31a is different from that of the first embodiment. Other parts are the same as in the first embodiment.

  FIG. 15 is a cross-sectional view along the circumferential direction of the step portion 31 of the flange portion 3 of the storage container 1 according to the second embodiment. 16 and 17 are sectional views of the first thin portion 31a and the second thin portion 31b along the radial direction, respectively. The first thin portion 31a protrudes above the lower surface 32b of the inner peripheral portion 32.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained. When the first thin portion 31a is protruded below the lower surface 32b of the inner peripheral portion 32 as in the first embodiment, when the lid portion 20 is bonded to the upper surface of the inner peripheral portion 32, the first thin portion 31a is formed. It is more desirable because the interference between the cover 20 and the cover 20 can be more reliably prevented.

  INDUSTRIAL APPLICATION This invention can be utilized for the storage container which consists of a resin sheet which has an oxygen absorption layer.

DESCRIPTION OF SYMBOLS 1 Storage container 2 Storage part 3 Flange part 4 Opening 11,16 Base material layer 12 Oxygen absorption layer 13,15 Adhesive layer 14 Barrier layer 20 Cover part 30 Groove part 31 Step part 31a First thin part 31b Second thin part 32 Inside Peripheral portion 35 Cutting surface 50 Molding portion 51 First mold 51a First recess 51b Second recess 51c Flat surface 52 Second mold 52a Projection 53 Third mold 53a Convex portion 53b Press portion 54 Upper heater 55 Lower heater 60 Punching part 70, 80 Roller 100 Resin sheet 200 Manufacturing equipment

Claims (6)

A storage formed of a resin sheet having an oxygen-absorbing layer containing a metal, and having a storage portion that opens an opening on the upper surface to store contents and an annular flange protruding from the periphery of the opening. In the container,
A first thin portion having a step portion disposed below the upper surface of the inner peripheral portion at an outer peripheral end of the flange portion , wherein the step portion has a thickness equal to or less than a thickness of the inner peripheral portion; A second thin portion thinner than the thin portion is provided alternately in the circumferential direction ,
A storage container , wherein upper surfaces of a first thin portion and a second thin portion are arranged at the same height, and a lower surface of the first thin portion is arranged below a lower surface of the second thin portion . A first thin portion protrudes below a lower surface of the inner peripheral portion, and a lower portion of the first thin portion extends to an inner peripheral side of a boundary between the inner peripheral portion and the second thin portion. The storage container according to claim 1 . Container according to claim 1 or claim 2, the thickness of the second thin portion, characterized in that more than 20% of the thickness of the inner peripheral portion. The storage container according to any one of claims 1 to 3 , wherein the circumferential width of the second thin portion is smaller than 2 mm. The storage container according to any one of claims 1 to 4 , wherein the width of the first thin portion in the circumferential direction is not less than １ ／ and not more than の of the cycle of the first thin portion. The storage container according to any one of claims 1 to 5 , wherein a main component of a front surface portion and a back surface portion of the resin sheet is polypropylene.

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