JP2017200744A - Method for producing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a container that allows a release sheet to be stuck on the inside of even such a container of complicated shape that is produced by injection molding.SOLUTION: A method for producing a container according to the present invention is for producing a container 2 for food, the method including a first molding step for injection-molding a container body 21 having an opening 20, and a second molding step for making the opening 20 of the molded container body 21 face a release sheet 22 having adhesiveness, and sticking the release sheet 22 to the container body 21 by sheet molding.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a container.

Conventionally, a container is known in which a film is attached to the inside of a tray used for a lunch box or the like, and the film can be peeled off after a meal so that it can be collected for recycling (see, for example, Patent Document 1).
In addition, spread-type product containers that contain foods such as butter, margarine, jam, and yogurt are known. Such a container is composed of a bottomed container filled with food, and a ceiling lid that can be opened and closed by opening and closing the outer periphery of the opening of the container body (for example, a patent) Reference 2). When the conventional container described in Patent Document 2 is to be recycled, it is preferable to collect the food remaining after adhering to the container by washing it with water or wiping it off and separating it from the container.

Registered Utility Model No. 315938 Japanese Patent Laying-Open No. 2015-187006

  A conventional container as described in Patent Document 1 is manufactured by sheet molding in a state where a film layer is laminated on a resin layer forming the container. On the other hand, a container having a complicated shape as described in Patent Document 2 is manufactured by injection molding and cannot be manufactured by sheet molding.

  The objective of this invention is providing the manufacturing method of the container which can affix a peeling sheet on the inner side even if it is a container of a complicated shape manufactured by injection molding.

  The container manufacturing method of the present invention is a method for manufacturing a container for food, and includes a first forming step of forming a container body having an opening, and a release sheet having adhesiveness in the opening of the formed container body. And a second forming step of attaching the peeling sheet to the container main body by sheet forming.

  According to the present invention, the container body is molded in the first molding step, and the release sheet is attached to the container body by sheet molding in the second molding step. Therefore, the container body having a complicated shape is molded in the first molding step. After that, a peeling sheet can be attached to the container body. Accordingly, it is possible to manufacture containers having various shapes in which the peeling sheet is attached to the inside.

  The container manufacturing method of the present invention preferably includes a through-hole forming step of forming a through-hole for vacuum forming of the peeling sheet in the container body, and the sheet is formed by vacuum forming.

  According to the present invention, the through hole for vacuum forming of the peeling sheet is formed in the container body, and the peeling sheet is formed by vacuum forming through the through hole. Can be attached.

  In the container manufacturing method of the present invention, the through hole is preferably formed by molding the container body in the first molding step.

  According to the present invention, since the through-hole is formed by molding the container main body, the through-hole forming step can be simultaneously performed by performing the first molding step, and the manufacturing time of the container can be shortened.

The disassembled perspective view which shows the food container which concerns on 1st Embodiment of this invention. Sectional drawing of the container which concerns on 1st Embodiment. The top view of the container of FIG. The figure for demonstrating the manufacturing method of the container of FIG. The figure for demonstrating the manufacturing method of the container of FIG. The figure for demonstrating the manufacturing method of the container of FIG. The figure for demonstrating the manufacturing method of the container of FIG. The disassembled perspective view which shows the food container which concerns on 2nd Embodiment of this invention. Sectional drawing of the container which concerns on 2nd Embodiment. The figure for demonstrating the manufacturing method of the container of FIG. The figure for demonstrating the manufacturing method of the container of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
In addition, when expressing a direction in the following description, as shown in FIG. 1, the state which put the food container 1 with the container 2 facing down is used as a reference. In the second and subsequent embodiments, the same constituent members as those in the first embodiment and constituent members having the same functions are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted or simplified. To do.

[First Embodiment]
In FIG. 1, a food container 1 contains food such as butter and margarine, and is a resin injection-molded product. The food container 1 includes a bottomed container 2 having an opening 20 formed in an upper portion thereof, and a lidded body 3 that is detachably attached to the container 2 and covers the opening 20. In such a food container 1, when the lid 3 is removed from the container 2 and the opening 20 is opened, the lid-side long side portion 34B of the lid 3 is gripped from the outside, and the lid 3 is distorted inward. Deformation (see white arrow and two-dot chain line in FIG. 1). Then, the lid side short side portion 34C of the lid body 3 is distorted so as to spread outward, the lid side corner portion 34A of the lid body 3 is spaced outward from the main body side corner portion 26A of the container 2, and the container 2 and lid 3 Are mutually disengaged.

[container]
As shown in FIGS. 2 and 3, the container 2 includes a container main body 21 and a peeling film 22 as a peeling sheet attached to the container main body 21 so as to be peelable.

  The container body 21 is made of a resin excellent in oil resistance and heat resistance, such as polypropylene and polyethylene terephthalate. The container body 21 is provided continuously in the circumferential direction on the upper surface of the bottom surface 23, the side surface 24 standing upward from the periphery of the bottom surface 23, and the upper edge of the side surface 24. A horizontally extending first flange 25, a substantially rectangular frame-like rising side wall 26 which is provided in the vertical direction from the tip edge of the first flange 25 and forms the edge of the opening 20, and It is provided with a second flange portion 27 that is continuously provided in the circumferential direction at the lower end edge of the side wall 26 and extends horizontally from the lower end edge toward the outside.

  The bottom surface portion 23 has a substantially rectangular shape in plan view, and has through holes 23A for vacuum forming the peeling film 22 at four corners thereof.

  The side surface portion 24 has a substantially rectangular frame shape in plan view. The side surface portion 24 is opposed to the opening 20 and is opposed to the long side surface portion 24A as a pair of gripping side surface portions that are gripped from the outside, and the side surface 24 is substantially perpendicular to the long side surface portion 24A. A short side surface portion 24B as a pair of non-grip side surfaces facing each other is provided.

The rising side wall 26 has a substantially rectangular frame shape in plan view. The rising side wall 26 includes a main body side corner portion 26A as an arcuate corner portion provided at four corners, and a pair of main body side long side portions 26B facing each other across the opening 20 and gripped from the outside. And a pair of main body side short side portions 26C facing the main body side long side portion 26B at substantially right angles.
The main body side corner portion 26A includes a single main body side engaging portion 26D that protrudes outward and has a predetermined length in the circumferential direction.

  The second flange portion 27 is provided continuously over the main body side corner portion 26A, the main body side long side portion 26B, and the main body side short side portion 26C. Such a second collar part 27 is a part that supports the lid 3. In FIG. 1, the second flange 27 extends greatly over the main body side short side portion 26C and the main body side corner portions 26A on both sides thereof, and the thickness of the lid 3 at a position corresponding to the main body side long side portion 26B. Although it is drawn extending so as to be small, it may be formed with substantially the same extending length along the circumferential direction, for example.

  The peeling film 22 is formed of a resin such as unstretched polypropylene or polyethylene terephthalate, and has weak adhesiveness. The peeling film 22 includes a first sticking portion 22A attached to the entire inner surface of the container body 21, a second sticking portion 22B attached to the entire upper edge of the rising side wall 26 of the container body 21, and a second sticking portion. And a tab 22C extending outward from 22B.

[Lid]
The lid 3 is continuously provided in the circumferential direction on the top surface portion 31, a substantially square frame-shaped side surface portion 32 that is suspended downward from the periphery of the top surface portion 31, and the lower end edge of the side surface portion 32. A first flange 33 slightly extending horizontally from the edge toward the outside, and a substantially rectangular frame that is suspended from the leading edge of the first flange 33 and is located outside the rising side wall 26 when attached to the container 2 And a second flange 35 which is continuously provided in the circumferential direction at the lower end edge of the hanging side wall 34 and slightly extends horizontally from the lower end edge toward the outside.

The hanging side wall 34 has a substantially rectangular frame shape in plan view. This hanging side wall 34 is opposed to the arcuate lid side corner 34A provided at the four corners with the opening 20 of the container 2 interposed therebetween, and is a lid side length as a pair of gripping side sides gripped from the outside. The side part 34B is provided, and the cover side short side part 34C as a pair of non-grip side parts that sandwich the opening 20 and face the lid side long side part 34B at a substantially right angle.
The lid-side corner portion 34A includes a single lid-side engagement portion 34D that protrudes inward and has a predetermined length in the circumferential direction and engages with and disengages from the main body-side engagement portion 26D. The lid side engaging portion 34D is provided by molding.

[Recycling of food containers]
In recycling the food container 1, it is necessary to clean and collect the food container 1 by washing or wiping off the food adhering to the food container 1. Here, the lid 3 is not in contact with the food in the container 2 so that the food does not adhere so much, whereas the container 2 has oil or the like of the stored food adhered to the peeling film 22. Often doing. Even in such a case, the food film adhering to the container 2 can be easily separated by peeling off the peeling film 22 from the container main body 21, and the container 2 can be put into a clean state and sent for recycling.

[Manufacturing method of container]
Next, the manufacturing method of the container 2 will be described.
First, the 1st shaping | molding process which shape | molds the container main body 21 is implemented. In the present embodiment, a case where the first molding process is performed by the injection molding apparatus 40 will be described based on FIGS. 4 and 5.

In FIG. 4, the injection molding apparatus 40 includes a cylinder 41 that melts and kneads a resin raw material, and a mold 42 that is connected to the cylinder 41.
The mold 42 includes a male mold 43 and a female mold 44. The male mold 43 includes a protruding portion 43A protruding from the top surface.

  As shown in FIG. 4, the injection molding apparatus 40 injects resin from the cylinder 41 into the cavity 45 formed by the male mold 43 and the female mold 44 in a state where the male mold 43 and the female mold 44 are clamped. Then fill. Next, by cooling the mold 42, the resin in the mold 42 is cooled and solidified. Thereby, the container main body 21 is molded in the cavity 45, and the through hole forming step for forming the through hole 23A in the container main body 21 is performed. Then, as shown in FIG. 5, after the male mold 43 and the female mold 44 are moved relative to each other and separated from each other, the container body 21 is released from the female mold 44.

  Next, the 2nd shaping | molding process of carrying out sheet shaping | molding of the peeling film 22 and sticking to the container main body 21 is implemented. In the present embodiment, the case where the second molding process is performed by the sheet molding apparatus 50 will be described with reference to FIGS. 6 and 7.

In FIG. 6, the sheet forming apparatus 50 includes a conveying device 51 that conveys the peeling film 22, a cutting device 52 that cuts the peeling film 22, and a vacuum forming device 53 that vacuum-forms the peeling film 22. Yes.
The transport device 51 includes a clamp 51A configured to be able to grip the peeling film 22 and a drive mechanism (not shown) that moves the clamp 51A.
The cutting device 52 includes a cutting blade 52A and a drive mechanism (not shown) that moves the cutting blade 52A.
The vacuum forming device 53 includes a heating device 54 such as a heater for heating the peeling film 22, a suction table 55 that supports the container body 21, and a vacuum pump 56 connected to the suction table 55. The suction table 55 includes a support surface 55 </ b> A that supports the container body 21, and a suction hole 55 </ b> B that is provided on the support surface 55 </ b> A and can apply a suction force by the decompression pump 56.

  As shown by the solid line in FIG. 6, the sheet forming apparatus 50 supports the container main body 21 at the position where the through hole 23A and the suction hole 55B communicate with each other with the suction table 55, and from the opening 20 of the container main body 21 with the clamp 51A. The peeling film 22 having a large outer shape is gripped. Next, after heating the peeling film 22 with the heating device 54, the sheet forming apparatus 50 moves the clamp 51 </ b> A as shown by a two-dot chain line in FIG. 6, and places the peeling film 22 in the opening 20 of the container body 21. The peeling film 22 is brought into contact with the upper end edge of the rising side wall 26 of the container body 21. Then, the sheet forming apparatus 50 depressurizes the space V1 surrounded by the container body 21 and the peeling film 22 with the vacuum pump 56 through the suction hole 55B and the through hole 23A, and the peeling film 22 is placed in the space V1. To suck. As a result, as shown in FIG. 7, the peeling film 22 is formed into a sheet using the container body 21 as a mold, and is attached to the inner surface of the container body 21 and the upper end edge of the rising side wall 26. That is, the peeling film 22 is formed in close contact with the container main body 21 by sheet forming, considering the container main body 21 as a receiving mold.

  Thereafter, as shown by a two-dot chain line in FIG. 7, the sheet forming apparatus 50 moves the cutting blade 52 </ b> A toward the peeling film 22, leaving the tab 22 </ b> C and the peeling film 22 on the outer edge of the rising side wall 26. A sheet cutting process is carried out to perform die cutting. Thereby, the container 2 by which the peeling film 22 was stuck to the inner surface of the container main body 21 as shown in FIG. 1 and FIG. 2 is manufactured.

[Effect of the embodiment]
According to the present embodiment, the container main body 21 is formed in the first forming step, and the peeling film 22 is formed into a sheet and attached to the container main body 21 in the second forming step, so that a complicated shape is formed in the first forming step. After the container main body 21 is formed, the peeling film 22 can be attached to the container main body 21. Accordingly, it is possible to manufacture containers 2 having various shapes to which the peeling film 22 is attached.

  Moreover, since the through-hole 23A is formed in the container main body 21, when the peeling film 22 is formed inside the container main body 21, the peeling film 22 is formed into a sheet by vacuum forming via the through-hole 23A. be able to. Therefore, the peeling film 22 can be stuck to the container main body 21 for pasting.

  Moreover, since the through-hole 23A is formed by injection molding of the container main body 21, the through-hole forming step can be simultaneously performed by performing the first molding step, and the manufacturing time of the container 2 can be shortened.

[Second Embodiment]
As shown in FIGS. 8 and 9, the food container 1 according to the present embodiment is different from the first embodiment in the shape of the peeling film 22 </ b> D of the container 2 </ b> A.
The peeling film 22 </ b> D is attached to the first sticking part 22 </ b> A, the second sticking part 22 </ b> B, the entire outer surface of the rising side wall 26 of the container main body 21, and the entire upper surface of the second flange part 27. And a tab 22F extending outward from the third sticking portion 22E.

  Next, based on FIG. 10 and FIG. 11, the manufacturing method of the container 2A will be described. In addition, since the 1st shaping | molding process is the same as that of 1st Embodiment, description is abbreviate | omitted and demonstrates the 2nd shaping | molding process and sheet cutting process by 50 A of sheet forming apparatuses.

In FIG. 10, the sheet forming apparatus 50A includes a conveying device 51, a cutting device 52, and a vacuum forming device 53A for vacuum forming the peeling film 22D.
The vacuum forming device 53 </ b> A includes a heating device 54, a suction table 57 that supports the container body 21, and a decompression pump 56. The suction table 57 has a concave portion 57A capable of supporting the bottom surface portion 23 and the side surface portion 24 of the container main body 21 on its inner surface, a first support surface 57B capable of supporting the first flange 25 of the container main body 21, and the container main body 21. A second support surface 57C capable of supporting the upright side wall 26 and the second flange 27, a first suction hole 57D provided in the recess 57A and capable of applying a suction force by the decompression pump 56, and a second support surface 57C. And a second suction hole 57E to which a suction force can be applied by the decompression pump 56, and a blade stop groove 57F provided on the first support surface 57B.

  As shown by the solid line in FIG. 10, the sheet forming apparatus 50 supports the container main body 21 with the suction table 57 and holds the peeling film 22D with the clamp 51A. Next, after heating the peeling film 22D with the heating device 54, the sheet forming apparatus 50 moves the clamp 51A as shown by a two-dot chain line in FIG. 10, and the upper end edge of the rising side wall 26 of the container body 21 and The peeling film 22 </ b> D is brought into contact with the suction table 57. Then, the sheet forming apparatus 50 divides the space V1 and the space V2 surrounded by the container body 21, the second support surface 57C, and the peeling film 22D into the through hole 23A, the first suction hole 57D, and the second suction. The pressure is reduced by the pressure reducing pump 56 through the hole 57E, and the peeling film 22D is sucked into the spaces V1 and V2. As a result, as shown in FIG. 11, the peeling film 22 </ b> D is formed into a sheet using the container body 21 as a mold and is attached to the container body 21.

  Thereafter, as shown by a two-dot chain line in FIG. 11, the sheet forming apparatus 50 moves the cutting blade 52 </ b> A toward the peeling film 22 </ b> D, leaves the tab 22 </ b> F, and removes the peeling film 22 </ b> D from the second flange portion 27. A sheet cutting step of punching along the outer edge is performed.

[Modification]
The present invention is not limited to the above-described embodiment, and modifications and the like within a scope that can achieve the object of the present invention are included in the present invention.
For example, the container body 21 may be made of polyethylene, polystyrene, or other resin. Moreover, the container main body 21 may be shape | molded by methods other than injection molding.
You may implement a through-hole formation process separately from a 1st shaping | molding process. That is, the through hole 23A may be formed after the container body 21 is injection molded. Further, the position where the through hole 23A is provided is not limited to the bottom surface portion 23 of the container main body 21 and may be provided, for example, on the side surface portion 24 of the container main body 21 when the container shape is complicated.

As the peeling sheet, a sheet other than a film may be used as long as it is an adhesive sheet.
It is preferable that the peeling sheet is in close contact with the container body 21 so as not to be broken when the sheet is peeled off.
The degree of adhesion between the peeling sheet and the container body 21 may be adjusted by selecting the thickness and material of the sheet according to the material and shape of the container body 21.
The peeling films 22 and 22D may be formed into a sheet by vacuum pressure forming, hot plate pressure forming, or other methods.
A plurality of tabs 22C and 22F may be provided. The tabs 22C and 22F are not limited to those partially extending from the second sticking portion 22B or the third sticking portion 22E, and are continuously provided in the circumferential direction on the second sticking portion 22B or the third sticking portion 22E. May be.

  A plurality of main body side engaging portions 26D and lid body side engaging portions 34D may be provided in the main body side corner portion 26A and the lid body side corner portion 34A.

  The side surface portion 24, the rising side wall 26, and the hanging side wall 34 may have a square frame shape instead of a rectangular frame shape in plan view. Even in the case of the rectangular frame shape, the gripped side is the short side surface portion 24B, the main body side short side portion 26C, and the lid side short side portion 34C, and the non-grip side is the long side surface portion 24A. It is good also as the side part 26B and the cover body side long side part 34B.

  The present invention can be suitably used as a container for storing food such as butter and margarine.

  DESCRIPTION OF SYMBOLS 1 ... Food container, 2 ... Container, 20 ... Opening, 3 ... Cover body, 21 ... Container main body, 22 ... Peeling film (peeling sheet), 23 ... Bottom part, 23A ... Through-hole, 24 ... Side part, 25 ... 1st collar part, 26 ... Standing side wall, 27 ... 2nd collar part.

Claims (3)

A method for producing a container for food,
A first molding step of molding a container body having an opening;
A container forming method comprising: a second forming step in which an adhesive release sheet is opposed to an opening of the formed container body, and the release sheet is attached to the container body by sheet forming. . In the manufacturing method of the container according to claim 1,
Comprising a through hole forming step for forming a through hole for vacuum forming of the peeling sheet in the container body,
A method for producing a container, wherein the sheet is formed by vacuum forming. In the manufacturing method of the container according to claim 2,
The said through-hole is formed by shaping | molding of the said container main body in a said 1st shaping | molding process, The manufacturing method of the container characterized by the above-mentioned.

Images