JP7180070B2 - LAMINATED TUBE CONTAINER AND MANUFACTURING METHOD THEREOF - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminate tube container for filling and packaging viscous contents such as daily necessities such as foods, cosmetics, medicines, and toothpastes, and in particular, it has excellent gas barrier properties and prevents deterioration of the contents for a long period of time. The present invention relates to a laminated tube container capable of maintaining quality over time.

BACKGROUND ART Laminated tube containers capable of containing and discharging viscous contents are widely used for foods, daily necessities such as toothpaste, pharmaceuticals, cosmetics, and the like. A laminated tube container is made by cutting a laminated sheet into a substantially rectangular shape of a predetermined size, overlapping both ends to form a tubular shape, and joining the overlapped portions to form a body portion of the laminated tube container. Normally, this joining utilizes the thermal adhesiveness of the material of the laminated sheet, and is performed by methods such as heat sealing, high frequency sealing, impulse sealing, and ultrasonic sealing. For this reason, the inner and outer surfaces of the laminated sheet forming the body are made of a resin having excellent mutual thermal adhesiveness. is the most widely used.

Laminated tube containers are coated with aluminum foil, metal thin films, or gas barriers on the body and neck of the container for the purpose of preventing the intrusion of oxygen and moisture from the outside, as well as the scattering of the moisture and aroma components of the contents. A technique for preventing deterioration of contents by providing a gas barrier layer such as a synthetic resin is widely used.

Patent Literature 1 discloses a laminated tube container having a body portion which is cylindrically formed from a laminate having a base material and a gas barrier laminate having a specific gas barrier layer laminated on at least one surface of the base material. It is said that it is possible to provide a container that is excellent in disposability and whose oxygen barrier property does not deteriorate even if the tube container is squeezed.

However, in the container disclosed in Patent Document 1, when both ends are overlapped to form a cylindrical shape, a resin having excellent thermal adhesiveness such as polyolefin resin is used for bonding at the overlapped portion. However, since this resin generally has poor gas barrier properties, the contents may be damaged by gases such as oxygen entering from the overlapped part, or by permeation and scattering of the components of the contents from the overlapped part. had deteriorated.

FIG. 8 schematically shows the aspect of the cross section of the bonded portion in which the laminated films provided with the barrier layer are superimposed in the above example. When the gas barrier layers 101 and 111 are provided between the stacked laminated films 100 and 110, the gas barrier layers 101 and 111 can effectively block the invasion of gas 130 such as oxygen from the outer surface side. However, since a region 102 having only a general plastic resin layer without a gas barrier layer is formed in the vicinity of the end surface of the laminated film on the outer surface side, gases such as oxygen enter from this portion along the bonded portion. You can't prevent it from coming. As a result, there is a problem that the content 113 inside the container along the bonded portion is linearly discolored or degraded if the content is discolored or degraded by oxygen, for example.

Further, in Patent Document 2, in a tube container, the overlapped portion of the trunk portion formed by overlapping and joining both side ends of a multilayer sheet containing a gas barrier layer is covered with a coating tape containing a gas barrier layer, and the inner surface side Alternatively, it is disclosed that by covering from the outer surface side, the intrusion of oxygen and the like from the overlapped portion and the permeation and scattering of the components of the contents are prevented.

However, the container disclosed in Patent Document 2 has a problem that the coating tape must be attached to each tube after the tube container is formed, which takes a lot of time and effort. Since it is attached, the appearance is poor, and there is a risk that it will come off during use.

Japanese Patent No. 4754383 JP-A-5-85553

Therefore, the present invention provides a simple method for preventing permeation of the components of the contents from the end of the overlapped portion of the body and invasion of gases such as oxygen from the outside without changing the layer structure or requiring time-consuming steps. It is an object of the present invention to provide a laminate tube container capable of improving the gas barrier property by reducing the gas barrier property by a simple method and suppressing deterioration of the contents, and a method of manufacturing the same.

In order to solve the above problems, the invention according to claim 1 of the present invention is
At least an outer surface resin layer, a gas barrier layer, and an inner surface resin layer are sequentially laminated to form a laminated film, and a laminated portion is heat-sealed to form a cylindrical trunk portion, and a shoulder is provided at one opening of the trunk portion. A laminate tube container provided with a head consisting of a part and a mouth connected thereto, wherein at least the inner surface of the container of the bonded part extends from the one opening of the body to the other opening. A concave portion is provided by compressing the laminated film in the thickness direction, and in the concave portion, the gas barrier layers superimposed at the bonding portion have a region closer to each other than a portion other than the concave portion. ,
The laminate tube container is characterized in that the concave portion is provided only on the inner surface side of the laminate tube container .

Further, the invention according to claim 2 of the present invention is
2. The laminate tube container according to claim 1, wherein a plurality of said recesses are provided.

Further, the invention according to claim 3 of the present invention is
A method for manufacturing a laminate tube container having a head formed by resin molding a shoulder and a mouth connected to the shoulder at one opening of the body, the method comprising the steps of:
At least, when forming the trunk portion by heat-sealing the bonded portion where both ends of the laminated film in which the outer surface resin layer, the gas barrier layer, and the inner surface resin layer are laminated in order, or by heat-sealing to form the trunk portion. After that, the convex portion provided on the heat seal member is heated and pressed at least on the inner surface side of the laminated tube container in the bonded portion from one opening of the body to the other opening, and the lamination is performed. A concave portion is provided only on the inner surface side of the laminated tube container of the film, and in the concave portion, the gas barrier layers overlapped at the bonding portion form a region closer than a portion other than the concave portion. It is a manufacturing method of the laminated tube container characterized by the above.

According to the invention of claim 1 of the present invention, from the end of the bonded portion of the normal body, gas such as oxygen permeates through the resin layer between the gas barrier layers, or the contents of the content. Where the component scatters, the two laminated films are compressed in the thickness direction by providing a recessed portion that is compressed in the thickness direction in the laminated part, so the inside of the two laminated films The gas barrier layers of (1) are close to each other and the gap between them is narrowed, the penetration of gas and the permeation of components are reduced, and a laminate tube container with improved gas barrier properties can be provided.

According to the second aspect of the present invention, the presence of a plurality of concave portions forms a plurality of portions with narrow intervals in the gas barrier layer, making it more difficult for gases such as oxygen to permeate, and the laminate tube having a higher gas barrier property. A container can be provided.

According to the third aspect of the invention, by providing the recess only on the inner surface side of the laminate tube container, the recess is invisible from the outside of the container, so the appearance is good, and dust does not accumulate in the recess. It is possible to provide a laminate tube container that does not impose restrictions on design and printing.

Further, according to the fourth aspect of the invention, the concave portion is formed by providing a convex portion on a heat sealing member (plate) of a normal heating/pressing device when heat sealing the bonded portion, or sandwiching the convex member. can be provided at the same time as a normal heat sealing step or as a series of steps following it, and efficiently provides a streaky recess without requiring a special device or a separate step It is possible to provide a manufacturing method that can

It is a cross-sectional view of the trunk|drum of a laminated tube container. It is a schematic diagram of the cross section of one form of the bonding part of the laminate tube container of this invention. It is a cross-sectional schematic diagram which shows the outline|summary of the procedure which forms a recessed part in a bonding part in the laminate tube container of this invention. It is a schematic diagram of the cross section which provided the recessed part of another form in the bonding part of the lamination tube container of this invention. It is a cross-sectional schematic diagram which shows the outline|summary of the procedure which forms a recessed part of another form in the bonding part of the lamination tube container of this invention. It is the side view which looked at the laminated tube container of this invention from the bonding part side. FIG. 2 is a schematic cross-sectional view of a configuration in which a plurality of concave portions are provided in the bonded portion of the laminate tube container of the present invention. It is a schematic cross-sectional view of a bonded portion of an example of a conventional laminate tube container.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. It should be noted that the present invention should not be construed as being limited to the following embodiments.

A general laminated tube container, as shown in FIG. A head consisting of a truncated cone-shaped shoulder and a mouth connected to it is formed by resin molding at one end and adhered or welded to serve as a spout for the contents, and the opening at the other end is for pouring the contents. It is formed in an open manner as an inlet for the injection. The spout can be further covered with a cap for sealing. After the content is injected, the injection port seals the container by pressing it flat and adhering it. In the following description, the horizontal direction is the direction in which the cylinder is sliced as shown in FIG. 1, and the vertical direction is the direction perpendicular to the horizontal direction connecting the openings at both ends.

FIG. 2 shows a schematic cross-sectional view of the bonded portion corresponding to the portion indicated by symbol A in FIG. 1 of one embodiment of the laminated tube container of the present invention. The laminate film 10 has an inner surface resin layer 11 and an outer surface resin layer 13 laminated on a gas barrier layer 12, respectively. The resin layer 11 and the outer surface resin layer 13 of the laminated film 10 on the inside face each other and are adhered to each other. In the bonded portion, concave portions 15 and 25 are formed by compressing the laminated film 10 in the thickness direction and formed in the shape of a line or band extending in the vertical direction.

Examples of the resin forming the inner surface resin layer 11 and the outer surface resin layer 13 include polyethylene resin, polypropylene resin, and polyethylene terephthalate resin, but are not limited to these. The thickness is set according to the size and content of the tube container, and can be set to, for example, about 160 μm. Aluminum foil can be preferably used for the gas barrier layer 12 when light shielding properties are particularly required, and the thickness is preferably 16 μm, for example. Further, instead of the aluminum foil, an ethylene-vinyl alcohol copolymer resin, a vapor-deposited film of metal oxide, or the like may be provided as the gas barrier layer. In the case of vapor-deposited films of metal oxide, the inside of the container can be seen from the outside by making the resin of the inner surface resin layer 11 and the outer surface resin layer 13 transparent.

Although the inner resin layer 11 and the outer resin layer 13 are shown here as single layers for the sake of simplification of drawing, they are not limited to single layers and may be configured by laminating a plurality of resin layers. Functional layers such as a layer, a hologram layer, and an antifouling layer may be laminated, and any of them can be optionally provided as long as the function and gas barrier properties of the laminated tube container are not impaired.

If the width of the concave portions 15 and 25 is about 1 mm, a sufficient effect of reducing gas permeation can be obtained, and for example, the width can be about 0.7 mm linear. Furthermore, it may be in a belt shape with a certain width. Also, the thickness of the laminated films 10, 10 at the recesses 15, 25 is preferably about 50% to 60% of the thickness at the other portions of the bonding portion.

In the present embodiment, the gas barrier layer 12 can block the invasion of the gas 30 such as oxygen from the outer surface side, and the formation of the recesses 15 and 25 allows the inner surface resin layer 11 and the gas barrier layer The layer 12 and the outer surface resin layer 13 are compressed and close to each other, and in particular, the area 16 where the gas barrier layer 12 is close is narrow. Even when a gas 31 such as oxygen enters from the region 14, which is only a plastic resin layer, the narrowed region 16 becomes an obstacle, making it difficult for the gas to pass through compared to conventional laminated tube containers. It is possible to reduce the amount of gas such as oxygen that reaches the end surface on the inner surface side of the mating portion and enters the inside of the container.

FIG. 3 is a schematic cross-sectional view explaining an outline of a method for providing such recesses. Protrusions 41, 41 are provided on the plates 40, 40 for heat-sealing the bonded portions. The convex portions 41, 41 may be formed in advance on the plates 40, 40, or may be provided by separately attaching a separate convex member. The plates 40, 40 are heated for heat sealing, and a heater or the like (not shown) for heating may be built in the plate 40 or heated from the outside. In the case of a metal foil such as shown in FIG.

By heat-pressing the plates 40, 40 as shown in the lower view of FIG. It is formed. Since the resin in the compressed portion is extruded and flows around, the thickness increases accordingly, but the increase in thickness is slight and does not pose a problem in practice, but the extruded resin is stored. A resin reservoir for the purpose may be provided in the vicinity of the convex portion of the plate. The heating conditions and pressurizing conditions of the plate may be appropriately set according to the outer surface resin layer, the resin used for the outer surface resin layer, the material of the gas barrier layer, the thickness, and other conditions.

FIG. 4 shows a schematic cross-sectional view of the lamination tube container of the present invention, in which a concave portion of another form is provided in the bonded portion. In this embodiment, the linear or strip-shaped concave portion 15 for blocking gas permeation through the resin layer is provided only from the inner surface side of the laminate tube container by compressing the bonded portion, and the gas barrier layer A region 16 sandwiched between 12 is narrowed. For this reason, the outer surface of the container is flat without any recesses, the appearance of the container is good, dust does not accumulate in the recesses, and the design or printing on the outer surface of the container is not hindered by the recesses and restricted. and is more preferable.

FIG. 5 is a diagram showing an outline of a method of providing recesses only from the inner surface side as in the laminate tube container of the form of FIG. Of the plates for heat sealing, only the plate on the inner surface side is provided with the convex portion 41, and the plate on the outer surface side has no convex portion and has a flat shape. The method of heating the plate, the heating conditions, the pressurizing conditions, and the like can be appropriately set in the same manner as in the above-described embodiments.

FIG. 6 is a side view of one embodiment of the laminate tube container of the present invention, viewed from the bonding portion side. The trunk portion 2 is formed into a cylindrical shape by heat-sealing laminated films at a bonding portion 19, and a head portion 7 consisting of a truncated cone-shaped shoulder portion 3 and a mouth portion 4 connected thereto is provided at one opening, The mouth portion 4 is covered with a cap 5 . The other opening is flattened and adhered to form a bottom seal portion 6 . A linear or strip-shaped concave portion 15 is provided in the bonded portion 19 from the inner surface side from the shoulder portion 3 to the bottom seal portion 6, and the outer surface side is flat. Since the outer surface is flat, the appearance is good, and there are no restrictions when printing or designing the outer surface.

FIG. 7 is a schematic cross-sectional view of a configuration in which two linear or strip-shaped concave portions are provided in the bonded portion of the laminate tube container of the present invention. Since the concave portions 15 and 17 are provided in two places, when a gas 31 such as oxygen enters from the region 14 which is only a general plastic resin layer near the end surface of the resin film which is the outer surface side of the bonded portion, the gas 31 such as oxygen enters. Intrusion of gas is blocked by the narrowed region 16 sandwiched between the gas barrier layers 12, and even if the gas further intrudes from there, the intrusion is blocked again by the second narrowed region 18. Therefore, the amount of gas such as oxygen reaching the inner end surface of the bonded portion and entering the container can be greatly reduced, and the gas barrier property can be further improved.

Although the figure shows a form in which the recesses 15 and 17 are provided only from the inner surface side, it goes without saying that the same effect can be obtained with a form in which the recesses are provided both from the outer surface side.

As described above, according to the laminated tube container of the present invention, the intrusion of gas such as oxygen from the outside, particularly from the end of the bonded portion of the body, is prevented by the concave portion provided in the bonded portion. It can be blocked more effectively than the laminate tube container, and the recess can be provided without requiring a special material or a special separate process, and can be provided without increasing the cost.

<Example 1>
・ Laminated film: polyethylene film (thickness 160 μm) / aluminum foil (16 μm) / polyethylene film (thickness 160 μm)
・Width of bonded part: 3.5 mm
・Thickness of laminated film at bonded part: 500 μm
・Width of recess: 0.7 mm
・Thickness of laminated film in concave portion: 300 μm
・For comparison, a sample with the same structure but without the concave portion was also manufactured.
A body portion of a laminate tube container having the above structure was fabricated experimentally, and the oxygen barrier property was measured by the Mocon method.

DESCRIPTION OF SYMBOLS 1... Laminated tube container 2... Body part 3... Shoulder part 4... Mouth part 5... Cap 6... Bottom sealing part 7... Head part 10... Laminated film 11 ...Inner surface resin layer 12...Gas barrier layer 13...Outer surface resin layer 14...Regions 15, 17, 25 consisting only of general plastic resin layers...Recesses 16, 18... Region 19 where the gas barrier layer is close: bonded portions 30, 31 gas such as oxygen 40 plate 41 convex portion

Claims (3)

At least an outer surface resin layer, a gas barrier layer, and an inner surface resin layer are sequentially laminated to form a laminated film, and a laminated portion is heat-sealed to form a cylindrical trunk portion, and a shoulder is provided at one opening of the trunk portion. A laminate tube container provided with a head consisting of a part and a mouth connected thereto, wherein at least the inner surface of the container of the bonded part extends from the one opening of the body to the other opening. A concave portion is provided by compressing the laminated film in the thickness direction, and in the concave portion, the gas barrier layers superimposed at the bonding portion have a region closer to each other than a portion other than the concave portion. ,
A laminate tube container, wherein the recess is provided only on the inner surface side of the laminate tube container . 2. The laminate tube container according to claim 1, wherein a plurality of said recesses are provided. A method for manufacturing a laminate tube container having a head formed by resin molding a shoulder and a mouth connected to the shoulder at one opening of the body, the method comprising the steps of:
At least, when forming the trunk portion by heat-sealing the bonded portion where both ends of the laminated film in which the outer surface resin layer, the gas barrier layer, and the inner surface resin layer are laminated in order, or by heat-sealing to form the trunk portion. After that, the convex portion provided on the heat seal member is heated and pressed at least on the inner surface side of the laminated tube container in the bonded portion from one opening of the body to the other opening, and the lamination is performed. A concave portion is provided only on the inner surface side of the laminated tube container of the film, and in the concave portion, the gas barrier layers overlapped at the bonding portion form a region closer than a portion other than the concave portion. A method for manufacturing a laminated tube container.

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