JP7218059B2 - CONTAINER WITH SHRINK FILM AND METHOD FOR MANUFACTURING SAME - Google Patents

Description

TECHNICAL FIELD The present invention relates to a container with a shrink film and a method for manufacturing the same.

BACKGROUND ART A container with a shrink film is known in which a cylindrical shrink film is attached to the trunk of a container body (see, for example, Patent Document 1). A container with a shrink film is manufactured by placing a cylindrical shrink film on the body of a formed container body, heating the entire shrink film to thermally shrink the shrink film, and attaching it to the body. can be done.

JP 2014-177302 A

By the way, when the body of the container body has a flat shape defining the longitudinal direction in a top view, and has a left-right inclined portion at least one end portion in the longitudinal direction that inclines from the lower side to the upper side toward the inside of the container. There is When the shrink film is attached to the left and right inclined portions as described above, the shrink film slides up along the left and right inclined portions during heat shrinkage, resulting in a problem that the shrink film cannot be attached neatly.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems. It is to provide a manufacturing method.

A container with a shrink film of the present invention has a container body having a mouth portion, a body portion and a bottom portion, and a tubular shrink film attached to the body portion, and the body portion defines a longitudinal direction in top view. At least one end in the longitudinal direction has a laterally inclined portion that slopes toward the inside of the container from one side to the other in the vertical direction, and the shrink film is attached to the laterally inclined portion. Also, an adhesive layer formed of a heat-sensitive adhesive is positioned only at one end of the shrink film and adhered to the body , and the body is attached to both ends in the longitudinal direction. and a left and right corner portion formed by the one end portion of the left and right inclined portion and a curved portion that curves toward the inside of the container from the end portion toward the one side, and the adhesive layer It has a first portion adhered to the curved portion at the left and right corner portions, and a second portion adhered to the one end portion of the left and right inclined portion at the left and right corner portions .

In the container with a shrink film of the present invention having the above configuration, it is preferable that the left and right corner portions are positioned at the lower end portion of the body portion.

The method for manufacturing a container with a shrink film according to the present invention includes a mouth portion, a body portion, and a bottom portion, and the body portion has a flat shape defining a longitudinal direction when viewed from above, and at least one end portion in the longitudinal direction. A container body forming step of forming a container body having a left-right inclined portion that inclines inward from one side in the vertical direction to the other side in the above; A shrink film having a shape is placed so that the one end is located on the one side and the shrink film surrounds the laterally inclined portion, and the adhesive layer is attached to the body by heating the one end. and a heat shrinking step of heating the entire shrink film in a state where the adhesive layer is adhered to the trunk portion to heat shrink the shrink film and attach it to the left and right inclined portions. and the body portion of the container body formed in the container body forming step is located at both ends in the longitudinal direction, and the one side end of the left and right inclined portion and the one side from the left and right inclined portion are arranged. a left and right corner portion formed by a curved portion that curves toward the inside of the container; is adhered to the one-side ends of the left and right inclined portions at the left and right corner portions .

In the method for manufacturing a container with a shrink film according to the present invention, in the configuration described above, it is preferable that the left and right corner portions are positioned at the lower end portion of the body portion.

ADVANTAGE OF THE INVENTION According to this invention, the container with a shrink film which the left-right inclination part located in the flat-shaped body part was neatly mounted|worn with the shrink film, and its manufacturing method can be provided.

1 is a front view showing a container with a shrink film according to one embodiment of the present invention; FIG. FIG. 2 is a perspective view of the container with the shrink film shown in FIG. 1; FIG. 2 is a top view showing a state before the shrink film of the container with the shrink film shown in FIG. 1 is attached. 3B is a front view of the shrink film shown in FIG. 3A; FIG. 1 is a flow chart showing a method of manufacturing a container with a shrink film according to one embodiment of the present invention.

Hereinafter, a container with a shrink film and a method for manufacturing the same according to an embodiment of the present invention will be described in detail by way of example with reference to the drawings.

As shown in FIGS. 1 and 2, a container 1 with a shrink film according to the present embodiment (hereinafter also referred to as container 1) includes a container body 10 having a mouth portion 11, a body portion 12 and a bottom portion 13, and a body portion 12 and a tubular shrink film 20 attached thereto.

The container body 10 is made of synthetic resin, but is not limited to this. Further, the container body 10 is formed by extrusion blow molding (EBM: Extrusion Blow Molding) or biaxially stretched blow molding from a preform, but is not limited to this. The contents of the container body 10 are not particularly limited, and may be liquid, for example.

The mouth portion 11 has a cylindrical shape centered on the central axis O, but is not limited to this, and may have a cylindrical shape centered on the central axis O. As shown in FIG. The outer peripheral surface of the mouth portion 11 is provided with a male screw portion 11a for attaching a cap set according to the application to the mouth portion 11, such as a pouring cap having a discharge port or a mounting cap for a pump. A snap fitting portion for plugging may be provided instead of the male screw portion 11a.

A flat-shaped trunk portion 12 that defines the longitudinal direction and the lateral direction in top view continues to the lower end of the mouth portion 11 . That is, the trunk portion 12 has a flat shape elongated in the left-right direction when viewed from above. The trunk portion 12 has a track-shaped cross-section in the vertical direction, but is not limited to this, and may be, for example, an elliptical shape or a polygonal shape. The trunk portion 12 has left and right inclined portions 14 at both ends in the longitudinal direction that are inclined toward the inside of the container from the lower side to the upper side. The left and right inclined portions 14 have the same left and right inclination angles (that is, a symmetrical shape), but are not limited to this, and may have a left and right asymmetrical shape. In addition, the laterally inclined portion 14 has one end in the longitudinal direction inclined toward the inside of the container from the lower side to the upper side, and the other end in the longitudinal direction is not inclined (that is, extends along the vertical direction). configuration). The trunk portion 12 is formed by a lower end portion 14a of a left-right inclined portion 14 at both ends in the longitudinal direction, that is, both ends in the left-right direction, and a curved portion 15 that curves downward from the lower end portion 14a toward the inside of the container. It has left and right corner portions 16 . The left and right corner portions 16 are located at the lower end portion 12 a of the trunk portion 12 . The left and right corner portions 16 have a symmetrical shape, but are not limited to this, and may have a left-right asymmetrical shape. An upper end portion 14 b of the laterally inclined portion 14 is positioned at an upper end portion 12 b of the trunk portion 12 . An upper end portion 12b of the body portion 12 is formed with a stepped portion whose diameter is reduced stepwise from the body portion 12 side toward the mouth portion 11 side.

The vertical direction means the direction along the central axis O of the mouth portion 11, the upward direction means the direction from the bottom portion 13 toward the mouth portion 11 (upward in FIG. 1), and the downward direction means the opposite direction. do. Moreover, a cross section means a cross section perpendicular to the central axis O. As shown in FIG. A left-right direction means a longitudinal direction. The front-rear direction means the transverse direction.

The laterally inclined portion 14 is straight when viewed from the front, but is not limited to this, and may be curved when viewed from the front. For example, the laterally inclined portion 14 may be inclined at least at one end in the longitudinal direction in a curved shape in which the angle of inclination toward the inside of the container increases from the lower side toward the upper side. When the laterally inclined portion 14 has such a curved shape, the shrink film 20 tends to ride up particularly strongly. especially great need. The circumferential length of the trunk portion 12 gradually decreases from the lower end portion 14a of the laterally inclined portion 14 to the upper end portion 14b of the laterally inclined portion 14 due to the inclination of the laterally inclined portion 14 .

At the lower end portion 14a of the laterally inclined portion 14, the flatness ratio L1/L2 of the body portion 12 is approximately 3, but the ratio is not limited to this and can be set to various sizes depending on the application. L1 is the length of the trunk 12 in the longitudinal direction, and L2 is the length of the trunk 12 in the short direction. At the lower end portion 14a of the laterally inclined portion 14, the longitudinal length L1 of the body portion 12 may be, for example, about 100 mm, but is not limited to this, and can be set to various sizes depending on the application. . The ratio (inclination ratio) of the longitudinal length L1 of the trunk portion 12 at the lower end portion 14a of the laterally inclined portion 14 to the longitudinal length L1 of the trunk portion 12 at the upper end portion 14b of the laterally inclined portion 14 is approximately 2. However, it is not limited to this, and can be set to various sizes according to the application. Although the length L2 of the trunk portion 12 in the lateral direction hardly changes from the lower end portion 14a to the upper end portion 14b of the laterally inclined portion 14, it is not limited to this.

The bottom portion 13 closes the lower end portion 12 a of the body portion 12 . The outer peripheral edge of the bottom portion 13 has a grounding portion that is continuous or intermittent in the circumferential direction. That is, the container 1 can be placed on a horizontal surface using the bottom portion 13 as a ground portion. The bottom portion 13 may be planar, or may be non-planar such that the central portion when viewed from the top is raised.

The shrink film 20 is attached to the left and right inclined portions 14 . Lower ends 20 a of the shrink film 20 are positioned at the left and right corners 16 . The upper end portion 20b of the shrink film 20 is positioned at the upper end portion 12b of the body portion 12. As shown in FIG. The shrink film 20 has a cylindrical shape in which the circumferential length does not change in the vertical direction as shown in FIGS. 3A and 3B before being attached. As shown in FIGS. 1 and 2, it has a tubular shape along the outer peripheral surface of the body portion 12 .

The shrink film 20 is composed of a tubular film body 21 and an adhesive layer 22 provided on the inner peripheral surface of the film body 21 . The adhesive layer 22 is provided only on the lower end portion 20 a of the shrink film 20 . The adhesive layer 22 is made of a heat-sensitive adhesive and is adhered to the trunk portion 12 by heating. That is, the shrink film 20 is adhered to the trunk portion 12 by the adhesive layer 22 only at the lower end portion 20a. The adhesive layer 22 adheres only to the left and right corner portions 16 of the trunk portion 12 . The adhesive layer 22 has a first portion 22a that adheres to the curved portion 15 at the left and right corner portions 16, and a second portion 22b that adheres to the lower ends 14a of the left and right inclined portions 14 at the left and right corner portions 16. ing. 2, the adhesive layer 22 is shown only on one side of the left and right corner portions 16. As shown in FIG.

As shown in FIGS. 3A and 3B, when the film body 21 is attached to the container body 10, the film body 21 changes from a folded cylindrical state to a cylindrical shape expanded to form a substantially rhombic shape when viewed from above. With its central axis X aligned with the central axis O of the mouth portion 11 and its longitudinal direction aligned with the longitudinal direction of the body portion 12, it is disposed so as to surround the laterally inclined portion 14 of the body portion 12. be. The film body 21 is composed of a rectangular front sheet portion 21a and a rear sheet portion 21b having the same shape as the front sheet portion 21a. The left and right edges of the front seat portion 21a are connected to the left and right edges of the rear seat portion 21b. Therefore, by bending the front seat portion 21a and the rear seat portion 21b in directions away from each other, the body portion 12 can be arranged inside them. A first portion 22 a and a second portion 22 b of the adhesive layer 22 are provided on the inner surfaces of the front sheet portion 21 a and the rear sheet portion 21 b that form the inner peripheral surface of the film body 21 . The first portions 22a of the adhesive layer 22 are intermittently provided on the front sheet portion 21a and the rear sheet portion 21b alternately in the left-right direction. The second portions 22b of the adhesive layer 22 are provided alternately in the vertical direction. Such a staggered arrangement can prevent contact between the adhesive layers 22 when the film body 21 is folded, thereby preventing the adhesive layers 22 from unintentionally adhering to each other.

The film main body 21 is made of a heat-shrinkable film as a base material, and can be appropriately provided with a printed layer or the like. The substrate can be composed of a single layer or multiple layers. Although the material of the base material is not particularly limited, for example, polystyrene (PS) resin, polyester resin, polyolefin resin and the like are preferable. The method of manufacturing the film body 21 is not particularly limited, but for example, melt film forming, solution film forming, or the like can be used. When the film body 21 is composed of a plurality of layers, for example, a coextrusion method, a dry lamination method, or the like can be used. The film body 21 is preferably uniaxially oriented in the circumferential direction from the viewpoint of exhibiting wearability due to heat shrinkage, but may be oriented biaxially or triaxially. A method for orienting the film body 21 is not particularly limited, but stretching by a roll method, a tenter method, a tube method, or the like can be used.

The adhesive layer 22 can be provided on the film body 21 by, for example, coating (part coating). The heat-sensitive adhesive that forms the adhesive layer 22 is not particularly limited. It may be a solvent type or the like composed of a modifier, an organic solvent, or the like. Although the base polymer is not particularly limited, vinyl acetate polymers such as ethylene-vinyl acetate copolymer (EVA) resins, acrylic polymers, and styrene polymers are preferred. The temperature (activation temperature) at which the adhesive layer 22 exhibits adhesiveness can be set as appropriate, and is, for example, 60° C. or higher. The adhesive strength of the adhesive layer 22 is determined by the shape of the laterally inclined portion 14 and the thickness of the shrink film 20 so as to sufficiently suppress the shrink film 20 from rising due to heat shrinkage that occurs when the shrink film 20 is attached to the laterally inclined portion 14 . It can be appropriately set according to the heat shrinkage force and the like.

The container 1 can be manufactured, for example, by the method described below (method for manufacturing a container with a shrink film according to the present embodiment).

As shown in FIG. 4, the method for manufacturing a container with a shrink film according to the present embodiment includes a container body forming step P1, an adhering step P2, and a heat shrinking step P3.

The container body forming step P<b>1 is a step of forming the container body 10 having the mouth portion 11 , the body portion 12 and the bottom portion 13 . In the container body 10 formed in the container body forming step P1, the trunk portion 12 has the left and right inclined portions 14 and the left and right corner portions 16 as described above.

In the bonding step P2 following the container body forming step P1, a cylindrical shrink having an adhesive layer 22 formed of a heat-sensitive adhesive located only at one end (lower end 20a) as shown in FIGS. 3A and 3B. The film 20 is arranged so that the end portion (lower end portion 20a) where the adhesive layer 22 is located (lower end portion 20a) is located on the lower side and the shrink film 20 surrounds the laterally inclined portion 14, and the end portion is heated to bond the film 20. This is the step of adhering the layer 22 to the body 12 .

In this bonding step P2, for example, a portion of a predetermined length is cut from a film that is folded into a long cylindrical shape and that has been coated with an adhesive layer 22 in advance at a predetermined position, and the cut portion is expanded. A tubular shrink film 20 may be used and arranged so as to surround the laterally inclined portion 14 . Then, in this arranged state, by locally heating the end portion where the adhesive layer 22 is located, for example, with hot air, the adhesive layer 22 develops adhesive strength and the film body 21 is thermally shrunk only at the end portion. By doing so, the film body 21 can be brought into close contact with the left and right corner portions 16 and the adhesive layer 22 can be adhered to the left and right corner portions 16 . In order to improve adhesiveness, the container body 10 may be preheated before the shrink film 20 is arranged.

In the heat shrinking step P3 that follows the bonding step P2, the entire shrink film 20 is heated while the adhesive layer 22 is adhered to the body portion 12, thereby heat shrinking the shrink film 20 and attaching it to the laterally inclined portion 14. and, for example, it can be carried out by passing through a steam type or hot air type furnace.

In this heat-shrinking step P3, the heat-shrinkable cylindrical shrink film 20 tightens the left-right inclined portion 14 inside the container. Therefore, a force acts on the shrink film 20 to lift the shrink film 20 along the left and right inclined portions 14 . However, in this embodiment, since the lower end portion 20a of the shrink film 20 is adhered to the left and right corner portions 16 by the adhesion step P2, the shrink film 20 can be sufficiently prevented from riding up. In particular, in the present embodiment, since the shrink film 20 is adhered at the left and right corner portions 16 positioned below the left and right inclined portions 14 which generate a force that pulls up the shrink film 20, it is possible to effectively prevent the shrink film 20 from being pulled up. In addition, by suppressing the shrink film 20 from riding up due to such adhesion at the left and right corner portions 16, the shrink film 20 as a whole can be stretched and can be neatly attached to the trunk portion 12.例文帳に追加

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, the left and right corner portions 16 are positioned at the lower end portion 12a of the trunk portion 12 in the above embodiment, but are not limited to this and may be positioned above the lower end portion 12a of the trunk portion 12 . In addition, when the left and right inclined portions 14 are inclined toward the inside of the container from the upper side toward the lower side at both ends or only one end in the longitudinal direction, the left and right corner portions 16 are positioned at the upper end portion 12b of the body portion 12. Alternatively, it may be located below the upper end portion 12b of the trunk portion 12. As shown in FIG.

1 Container with Shrink Film 10 Container Body 11 Mouth 11a Male Thread 12 Body 12a Lower End 12b Upper End 13 Bottom 14 Left/Right Inclined Part 14a Lower End 14b Upper End 15 Curved Part 16 Left/Right Corner 20 Shrink Film 20a Lower End 20b Upper End Portion 21 Film body 21a Front sheet portion 21b Rear sheet portion 22 Adhesive layer 22a First portion 22b Second portion O, X Center axis L1/L2 Flatness L1 Length in longitudinal direction of trunk L2 Short direction of trunk length P1 container body forming process P2 bonding process P3 heat shrinking process

Claims (4)

A container body having a mouth, a body and a bottom, and a cylindrical shrink film attached to the body,
The body has a flat shape defining a longitudinal direction when viewed from above, and has a laterally inclined portion that slopes toward the inside of the container from one side in the vertical direction to the other side at at least one end in the longitudinal direction,
The shrink film is attached to the left and right inclined portions, and has an adhesive layer formed of a heat-sensitive adhesive that is positioned only at the one end of the shrink film and adhered to the body,
The body portion is located at both ends in the longitudinal direction and is formed by the one-side end portion of the left-right inclined portion and a curved portion that curves from the end portion toward the one side toward the inside of the container. having corners,
The adhesive layer has a first portion adhered to the curved portion at the left and right corner portions, and a second portion adhered to one end portion of the left and right inclined portion at the left and right corner portions. A container with a shrink film, characterized by: 2. The container with a shrink film according to claim 1 , wherein said left and right corner portions are positioned at the lower end portion of said body portion. In addition to having a mouth portion, a trunk portion and a bottom portion, the trunk portion has a flat shape defining a longitudinal direction in a top view, and at least one end portion in the longitudinal direction extends from one side in the vertical direction to the other side. a container body forming step of forming a container body having left and right inclined portions inclined inward;
A cylindrical shrink film having an adhesive layer formed of a heat-sensitive adhesive positioned only at one end is arranged such that the one end is positioned at the one side and the shrink film surrounds the laterally inclined portion. a bonding step of bonding the adhesive layer to the body by heating the one end;
a heat shrinking step of heating the entire shrink film in a state where the adhesive layer is adhered to the body portion, thereby heat shrinking the shrink film and attaching it to the left and right inclined portions ;
The body portion of the container body formed in the container body forming step is located at both ends in the longitudinal direction, and the one side end of the laterally inclined portion and the container extending from the one side end to the one side. having left and right corner portions formed by a curved portion that curves inward,
In the adhering step, the first portion of the adhesive layer is adhered to the curved portion at the left and right corner portions, and the second portion of the adhesive layer is adhered to the one end of the left and right inclined portion at the left and right corner portions. A method for manufacturing a container with a shrink film, characterized by adhering to a part . 4. The method for manufacturing a container with a shrink film according to claim 3 , wherein the left and right corner portions are positioned at the lower end portion of the body portion.

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