JP2022114756A - tube container - Google Patents

Abstract

To provide a tube container which, while being a tube container with a tubular body composed of a laminated sheet containing paper, does not break in the middle of the body due to carelessness even when discharging contents.SOLUTION: A tube container 100 is composed of a tubular body 110 and a spout 120 fixed to one end of the body. One end of the body is flattened and sealed to form a closing seal part 110b. The body is composed of a laminated sheet 1100 containing paper 1101, and the body 110 is embossed with a plurality of spiral rule marks 110α1 to 110α2.SELECTED DRAWING: Figure 1

Description

The present invention relates to tube containers.

BACKGROUND ART Tube containers made mainly of resin are widely used as packaging materials for pharmaceuticals, cosmetics, foods, and the like. For example, Patent Literature 1 describes a tube container composed of a pouring unit for extracting the contents and a body welded to the pouring unit and containing the contents.

JP 2016-199280 A

A tube container such as that described in Patent Document 1 is generally molded by plastic injection molding, compression molding, or the like, and usually, almost 100% of the material of the tube container is plastic.

In recent years, marine pollution caused by plastic waste and the possibility of depletion of oil resources have become problems. In addition, bioplastics made from biological resources (biomass) such as corn and sugar cane have been put to practical use, but simply replacing petroleum-derived plastics with bioplastics will not produce the raw materials for bioplastics, as the production of raw materials for bioplastics will not be sufficient for food production. The problem of squeezing the cultivated land arises. Therefore, there is an urgent need to reduce the amount of plastic used from the viewpoint of reducing the environmental load and protecting resources. In order to reduce the amount of resin used in tube containers as well, it is conceivable to use paper for the body, for example.

By the way, the tube container is usually covered with a cap and can be turned upside down with the cap facing downward. However, in a paper tube container using paper for the body, the more the ratio of the paper is increased and the amount of resin is decreased, the more the tube-shaped body is bent and the more difficult it is to stand upside down. This tendency increases as the amount of the contents remaining in the tube container after the contents are poured out decreases, not only impairing usability and design, but also clogging the bent portions, making it impossible to pour out the contents. It was difficult at times.

Accordingly, the present invention provides a tube container having a tube-shaped body composed of a laminated sheet containing paper, and in which the body does not unintentionally bend when the contents are poured out. intended to provide

That is, the invention according to claim 1 is composed of a tube-shaped body and a spout fixed to one end of the body, and one end of the body is flattened. In a tube container having a closed seal sealed with
the body is made of a laminated sheet containing paper;
Further, the tube container is characterized in that, when a plane perpendicular to the center line of the body is taken as a transverse section, a ruled line that intersects the transverse section is embossed.

Next, the invention according to claim 2 is the tube container according to claim 1, characterized by having a plurality of ruled lines.

Next, the invention according to claim 3 is the tube container according to claim 1 or 2, wherein the cross section and the ruled line intersect at an arbitrary height.

Next, the invention according to claim 4 is the tube container according to any one of claims 1 to 3, wherein the ruled line is provided in a spiral shape on the body.

Next, the invention according to claim 5 is characterized in that all of the ruled lines are ruled lines embossed so as to protrude toward the outside or inside of the tube container. A tube container according to .

Next, in the area of the laminated sheet, when the area located on one side of the laminated sheet with respect to the closing seal portion is the front side area and the opposite side is the back side area, the front side area In the region, the ruled lines are embossed so as to protrude toward the outside of the tube container, and in the back region, the ruled lines are embossed so as to protrude toward the inside of the tube container. A tube container according to any one of claims 1 to 4.

Next, in the invention according to claim 7, a back-pasted seal portion is formed on the trunk portion by abutting the laminated sheet in a palm-to-face shape and sealing,
7. The tube container according to any one of claims 1 to 6, wherein the backing seal portion is folded along the outer surface of the body portion and sealed to the body portion.

Next, according to the eighth aspect of the invention, the spout portion has a spout cylinder portion and a flat plate portion,
The pouring cylinder part has a cylindrical shape and has a flange at one end in the axial direction,
The flat plate portion has an annular flat plate shape provided with an opening having substantially the same shape as the cross section of the pouring cylinder portion,
The spout portion is configured such that one surface is sealed to the flange of the spout tube portion in a state where the spout portion penetrates the opening of the flat plate portion,
8. The tube container according to any one of claims 1 to 7, characterized in that the pouring tube part is composed of a sheet mainly made of paper.

According to the present invention, since the ruled lines crossing the cross section of the body are embossed, the body is reinforced by the embossed ruled lines, and the body is prevented from unintentionally bending. Even after part or all of the contents have been poured out, the body does not unintentionally bend.

FIG. 1 is an exploded perspective view for explaining a tube container with a cap according to a first embodiment of the present invention. FIG. 2 relates to the first embodiment of the present invention, and is an explanatory cross-sectional view taken along line 1x-1x in FIG. FIG. 3 relates to the first embodiment of the present invention, and is an explanatory cross-sectional view taken along line 1y-1y in FIG. FIG. 4 relates to the first embodiment of the present invention, and is an explanatory cross-sectional view taken along line 1z-1z in FIG. FIG. 5 is an explanatory cross-sectional view of a laminated sheet forming a trunk portion according to the first embodiment of the present invention. FIG. 6 is an explanatory plan view of a laminated sheet forming the trunk portion according to the first embodiment of the present invention. FIG. 7 relates to the first embodiment of the present invention, and FIGS. 7(a) to 7(d) are cross-sectional views for explaining the steps of manufacturing the body. FIG. 8 relates to the first embodiment of the present invention, and FIGS. 9(a) to 9(c) are cross-sectional views for explaining the method of welding the body and the spout. FIG. 9 is an explanatory exploded perspective view of a tube container with a cap according to a second embodiment of the present invention. FIG. 10 relates to the second embodiment of the present invention, and is an enlarged sectional view for explanation along the 2x-2x line in FIG. FIG. 11 relates to the second embodiment of the present invention, and is an explanatory cross-sectional view of a laminated sheet that constitutes the pouring tube portion of the pouring port. FIG. 12 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 13 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 14 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 15 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 16 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 17 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 18 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 19 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 20 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 21 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 22 is an explanatory cross-sectional view for explaining the manufacturing process of the tube container according to the second embodiment of the present invention. FIG. 23 is an explanatory cross-sectional view for explaining the manufacturing process of the cap according to the second embodiment of the present invention. FIG. 24 is an explanatory cross-sectional view for explaining the manufacturing process of the cap according to the second embodiment of the present invention. FIG. 25 is an explanatory cross-sectional view for explaining the manufacturing process of the cap according to the second embodiment of the present invention.

The present invention will now be described by taking two embodiments as examples. Of the two embodiments, the first embodiment is an example of a tube container 100 using an integrally molded resin spout portion 120, and the second embodiment is an example of a spout portion 220 that is a spout tube portion. This is an example of the tube container 200 which is composed of two parts, 221 and a flat plate portion 222, both of which are composed of laminated sheets containing paper.

[First embodiment]
A first embodiment will be described with reference to FIGS. 1 to 8. FIG.

FIG. 1 is an explanatory exploded perspective view of a tube container with a cap. Moreover, FIG.
FIG. 3 is a cross-sectional view for explanation along the line x-1x, FIG. 3 is a cross-sectional view for explanation along the line 1y-1y in FIG. 1, and FIG. 4 is a cross-sectional view for explanation along the line 1z-1z in FIG.

The tube container 100 includes a tube-shaped body portion 110 and a spout portion 120 attached to the body portion 110 .

The body portion 110 is a member for containing contents, and is formed of a laminated sheet _110-0 including _a paper 110-1 and a sealant layer _110-4 . Then, this lamination sheet ₁₁₀₀ having a pair of substantially parallel edges is rolled, and the inner surfaces of the band-shaped portions including the pair of edges of the _lamination sheet 1100 are brought into contact with each other and welded to this portion. A tube-shaped trunk portion 110 is formed by forming the back seal portion 110a. Then, as shown in FIG. 4, the back pasting seal portion 110a is bent along the outer surface of the trunk portion 110 and sealed to the trunk portion 110. As shown in FIG. The outer surface of the back seal portion 110a and the outer surface of the trunk portion 110 are sealed using a material having thermal adhesiveness. The body 110 can be manufactured using a bag-making machine, a pillow/stick packaging machine, or the like.

As shown in FIGS. 1 and 2, one end of the body portion 110 is flattened and sealed to form a closed seal portion 110b.

On the other hand, a spout portion 120 is fixed to the other end portion of the body portion 110 .

The spout portion 120 is a spout for extracting the contents accommodated in the body portion 110 to the outside, and is molded from a material containing thermoplastic resin. The spout portion 120 includes a spout tube portion 121 and a flat plate portion 122 . The flat plate portion 122 is a flat plate-like portion that is connected to one end of the pouring tube portion 121 and extends outward from the pouring tube portion 121 . In this embodiment, the flat plate portion 122 is formed so as to extend in a direction perpendicular to the axial direction of the pouring tube portion 121 (horizontal direction in FIGS. 1 and 2). In the present embodiment, the flat plate portion 122 is formed in an annular shape. It may be rectangular or the like.

On the other hand, a spout portion 120 is fixed to the other end portion of the body portion 110 .

The spout portion 120 is a spout for extracting the contents accommodated in the body portion 110 to the outside, and is molded from a material containing thermoplastic resin. The spout portion 120 includes a spout tube portion 121 and a flat plate portion 122 . The flat plate portion 122 is a flat plate-like portion that is connected to one end of the pouring tube portion 121 and extends outward from the pouring tube portion 121 . In this embodiment, the flat plate portion 122 is formed so as to extend in a direction perpendicular to the axial direction of the pouring tube portion 121 (horizontal direction in FIGS. 1 and 2). In the present embodiment, the flat plate portion 122 is formed in an annular shape. It may be rectangular or the like.

Examples of the thermoplastic resin used as the material for the spout portion 120 include polyethylene-based resins such as polyethylene and ethylene-vinyl alcohol copolymer, polypropylene-based resins, polyester-based resins, polyamide-based resins, cyclopolyolefin-based resins, and the like. Any one type or a combination of two or more types can be used. The spout part 120 may be molded from a material containing a thermoplastic resin and a filler other than the resin. As the filler, any one of talc, kaolin, paper powder, and cellulose fiber, or a combination of two or more. can be used By using a mixture of a thermoplastic resin and a filler other than resin as the material of the spout portion 120, the amount of resin used can be reduced while maintaining the _moldability and the heat-welding property between the body portion 110 and the laminated sheet 1100. can be reduced. The molding method of the spout portion 120 is not particularly limited, but existing molding methods such as injection molding, thermoforming such as vacuum molding and hot plate pressure molding, and compression molding can be used.

A portion of the body portion 110 within a predetermined range from the end opposite to the end where the closing seal portion 110b is formed is folded and sealed to the outer surface of the flat plate portion 122 of the spout portion 120. ing. As shown in FIGS. 1 and 4, the laminated sheet 1100 forming the body portion 110 is folded on the flat plate portion 122 to form an overlapping portion _110c1 , and the overlapping portion _110c1 forms _a plurality of pleats 110c. be done. In the _overlapping portion _110c1 , the outer _surfaces of the overlapping laminated sheets 1100 are in contact with each other, and the outer surfaces of the mutually contacting laminated sheets 1100 are sealed using a material having heat-sealability.

Next, FIG. ₅ is an explanatory cross-sectional view showing an example of the layer structure of the laminated sheet 1100 forming the body portion 110 of the tube container 100. As shown in FIG.

A body portion ₁₁₀ of the tube container 100 is composed of a laminated sheet 1100 mainly made of paper. The laminated sheet _110-0 is made by laminating a base film layer _110-2 , a barrier layer _110-3 and a sealant layer 110-4 on _one side of the paper 110-1 in this order, and a paper protective layer 110 _on the _other side of the paper 110-1. ₅ , an ink layer ₁₁₀₆ and an overcoat varnish layer ₁₁₀₇ are laminated _on the paper protective layer 1105, and a heat-fusible coat layer ₁₁₀₈ is pattern-coated. The details of each layer will be described below.

The paper 1101 is _a structural layer that gives strength and stiffness to the tube container 100 . _The type of paper forming the paper 1101 is not particularly limited, but it is preferable to use single-glazed kraft paper or double-glazed kraft paper in terms of strength, bending resistance, and printability. As the paper forming the paper ₁₁₀₁ , waterproof paper or greaseproof paper may be used as required. The paper 1101 may be paper containing 50% or _more of pulp fiber, and may be mixed paper containing resin fiber in addition to pulp fiber.

The basis weight of the paper used for the paper 1101 is preferably ^{30-300 g/m 2} _. If the basis weight of the paper used for the paper ^{1101 is less than 30 g/m 2} _, the stiffness of the body 110 is insufficient. In order to compensate for stiffness, for example, it is necessary to increase the thickness of the resin film provided inside the paper 1101, but this leads to _an increase in the resin ratio, which is not desirable in terms of reducing the environmental load. In addition, when the basis weight of the paper used for the paper 110 ₁ exceeds 300 g/m ² , the stiffness and heat insulation properties of the paper deteriorate cylinder-making properties (bag-making properties), moldability, and adhesion properties, and also increase the manufacturing cost. Unfavorable because it increases. Moreover, since it is easy to form embossed ruled lines 110α ₁ and 110α ₂ which will be described later, it is more preferably 50 to 150 g/m ² .

The base film layer _110-2 is a layer that imparts heat resistance and physical strength to the laminated sheet _110-0 . The base film layer _110-2 is also a layer that serves as a base material for the barrier layer _110-3 . _The material of the film constituting the base film layer 1102 is not particularly limited, but from the viewpoint of heat resistance and physical strength, it is preferable to use a stretched film of polypropylene, polyester, polyamide, or the like. However, the base film layer ₁₁₀₂ may be made of paper.

The barrier layer ₁₁₀₃ is a functional layer that blocks oxygen, water vapor, etc. to improve the storage stability of the contents. The barrier layer ₁₁₀₃ is, for example, a vapor deposition film of an inorganic compound such as silica or alumina, a vapor deposition film of a metal such as aluminum, a metal foil such as aluminum, a plate-like mineral and/or a coating film of a barrier coating agent containing a barrier resin. It can be composed of one or more types. Ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), etc. can be used as the barrier resin used for the barrier coating agent, and binder resins other than the barrier resin can be used as appropriate for the barrier coating agent. blended. The barrier layer ₁₁₀₃ is formed in advance by the base film layer 11
It may be laminated on ₀₂ to constitute a barrier film, or may be provided as a single layer film.

Although the material of the sealant layer ₁₁₀₄ is not particularly limited, thermoplastic resins such as polypropylene, polyethylene, cyclic polyolefin, and polyester are preferable. A resin having a softening temperature lower than that of the base film layer 1102 by ₂₀ ° C. or more is used for the sealant layer ₁₁₀₄ . If the softening temperature of the sealant layer ₁₁₀₄ is not lower _than the softening temperature of the base film layer 1102 by ₂₀ ° C. or more, the base film layer 1102 softens during sealing, which increases the possibility of pinholes, which is preferable. do not have. The softening temperature of the sealant layer 110-4 is preferably ₄₀ ° C. or more lower _than the softening temperature of the base film layer 110-2.

The thermoplastic resin used for the sealant layer ₁₁₀₄ may be any material as long as it has adhesiveness to the thermoplastic resin forming the material of the spout portion 120. However, the thermoplastic resin used for the spout portion 120 is the same material. Preferably. By using the same thermoplastic resin for the sealant layer ₁₁₀₄ and the thermoplastic resin layer for the spout portion 120, the sealing strength between the body portion 110 and the spout portion 120 can be improved.

The paper protective layer _110-5 is _a layer for protecting the paper 110-1 constituting the laminated sheet _110-0 from adhesion of contents and stains. The material and formation method of the paper protective layer ₁₁₀₅ are not particularly limited, but the paper protective layer ₁₁₀₅ can be laminated by extrusion coating of a thermoplastic resin or coating with a coating agent such as a water-resistant agent or an oil-resistant agent. The thickness of the paper protective layer 1105 is preferably _0.2-50 μm, more preferably 1-20 μm. If the thickness of the paper protective layer _110-5 is _less than 0.2 μm, pinholes may occur in the paper protective layer _110-5 , and the protection of the paper 110-1 may become insufficient. Moreover, if the thickness of the paper protective layer 1105 exceeds ₅₀ μm, it is not preferable in terms of the amount of resin used and the manufacturing cost.

The ink layer ₁₁₀₆ is a layer applied by printing for various displays, and the overcoat varnish layer ₁₁₀₇ is a layer for imparting wear resistance and the like. The stacking order of the ink layer ₁₁₀₆ and the overcoat varnish layer ₁₁₀₇ may be reversed from that in FIG. Moreover, the overcoat varnish layer _110-7 may also serve as the paper protective layer _110-5 .

The thermal adhesive coating layer ₁₁₀₈ is a layer for imparting thermal adhesiveness to the outer surface of the laminated sheet ₁₁₀₀ . In this embodiment, as will be described later, the outer surface of the backing seal portion 110a is sealed to the outer surface of the trunk portion 110 by a heat _{- fusible} coating layer 1108 pattern-coated on the outer surface of the laminated sheet 1100 (FIG. 3). ), the overlapping portion _110c1 formed on the flat plate portion 122 of the outlet portion ₁₂₀ seals the outer surfaces of the mutually overlapping laminated sheets 1100 (see FIG. 4).

The heat _- fusible coating layer 1108 can be formed by applying and drying a coating agent containing a thermoplastic resin having a melting point of 200° C. or less such as acrylic polymer, polyolefin, polyvinyl acetate, or polyester. In addition to the thermoplastic resin, the coating agent may contain an inorganic substance or the like for preventing blocking.

The coating amount of the coating agent for forming the heat _- fusible coating layer 1108 is 0.2 to 40 g/m ² , preferably 3.0 to 30 g/m ² . When the coating amount of the coating agent is less than 0.2 g/m ² , the adhesive strength between the outer surfaces of the laminated sheet 1100 is insufficient, and the phenomenon that the laminated sheet 1100 bounces up at the back _- pasted seal portion _110a and the overlapping portion _110c1 (hereinafter referred to as , "paper splash") occurs. On the other hand, when the coating amount of the coating agent exceeds 40 g/m ² , the _coefficient of friction increases, the mechanical suitability for processing equipment such as a bag-making machine decreases, and blocking between the laminated sheets 1100 tends to occur. do.

The heat-adhesive coating layer ₁₁₀₈ may be provided _on the entire surface of the laminated sheet 1100, but since the _coefficient of friction on the surface of the laminated sheet 1100 becomes large, it is Machine aptitude may decrease. Therefore, it is preferable from the standpoint of mechanical suitability that the heat-fusible coating layer 1108 is provided _on a part of the surface of the laminated sheet ₁₁₀₀ by pattern coating (partial coating) with a coating agent.

When the thermally adhesive coating layer 1108 is provided _on a part of the surface of the laminated sheet 1100, the portion to be sealed, that is, the portion where the outer surface of the back seal portion _110a and the outer surface of the body portion 110 contact, and the overlapping portion 110c. ₁ , a heat-adhesive coat layer 1108 may be provided _on the portion where the outer surfaces of the laminated sheets ₁₁₀₀ to be stacked on each other are in contact with each other. However, the heat-adhesive coating layer 1108 may be provided only _on one of the contact surfaces at the sealing target location.

The thickness (total thickness) of the laminated sheet ₁₁₀₀ forming the trunk portion 110 is not particularly limited, but is preferably 30 to 300 μm. If the thickness of the laminated sheet ₁₁₀₀ is within this range, the trunk portion 110 can be easily processed into a cylindrical shape using a bag-making machine, a pillow/stick packaging machine, or the like. _In addition, since the paper 1101 imparts strength and stiffness, the tube can be made thinner and the amount of resin used can be reduced compared to a general laminated tube (300 to 500 μm in thickness).

In order to reduce the resin ratio of the laminated sheet ₁₁₀₀ forming the body 110, it is preferable that the paper ₁₁₀₁ accounts for ₅₀ % or more of the weight of the laminated sheet 1100. From the viewpoint of reducing the amount of resin used, the higher the _ratio of the paper 1101, the better.

_In addition, in the layer _structure of the _{laminated sheet 1100} shown in _FIG . You can omit it.

Specific examples of the laminated sheet ₁₁₀₀ in which one or more of these layers are omitted include, for example, those in which the following layers are laminated in this order.
Paper (basis weight 70 g/m ² )/polyester film provided with an inorganic deposited film (thickness 12 μm)/polyamide film (thickness 13 μm)/polyethylene layer (thickness 50 μm).
Paper (basis weight 120 g/m ² )/polyester film provided with an inorganic deposition film (thickness 12 μm)/polyamide film (thickness 13 μm)/polyethylene layer (thickness 50 μm).
• Paper (basis weight 150 g/m ² )/polyethylene layer (thickness 50 µm)/ethylene-vinyl alcohol copolymer film (thickness 30 µm)/polyethylene layer (thickness 50 µm).
• Polyethylene layer (thickness 30 μm)/paper (basis weight 150 g/m ² )/polyethylene layer (thickness 50 μm)/ethylene-vinyl alcohol copolymer film (thickness 30 μm)/polyethylene layer (thickness 50 μm).
• Polyethylene layer (thickness 30 μm)/paper (basis weight 200 g/m ² )/polyethylene layer (thickness 50 μm).

By the way, as shown in FIG. 1, two ruled lines 110α ₁ to 110α ₃ extending spirally are embossed on the body portion 110 . Of these two embossed ruled lines 110α ₁ to 110α ₃ , the embossed ruled line 110α ₁ extends from the spout portion 120 to the closing seal portion 110b. For this reason, when a plane perpendicular to the center line of the body portion 110 is taken as a cross section, the cross section and the embossing ruled line _110α1 intersect at an arbitrary height, and the body portion 110 is reinforced and this body This prevents the portion 110 from unintentionally bending.

In addition, when the embossed ruled line _110α1 is provided in a spiral shape in this way, after pressing the barrel 110 and pouring out a part of the contents, the barrel 110 can easily return to its original cylindrical shape. Therefore, air can easily flow in from the outlet portion 120 . When the tube container 100 is stored upside down, the content remaining inside gathers in the vicinity of the pouring port 120 due to its own weight. can be made

The other embossing ruled line _110α3 is provided on a part of the body portion 110. As shown in FIG. This embossed ruled line _110α3 also reinforces the body portion 110 and prevents it from bending.

In this way, the body portion 110 may have one or more embossed creases, but they extend from the spout portion 120 to the closure seal portion 110b and intersect a cross section of any height. It is desirable that A single embossed ruled line may extend from the spout portion 120 to the closing seal portion 110b, or different embossed ruled lines may intersect according to the height of the cross section.

These two embossed ruled lines 110α ₁ to 110α ₃ may be embossed ruled lines that protrude from the outside to the inside of the tube container 100, or conversely, protrude from the inside to the outside. It may be a ruled line embossed as follows. Alternatively, it may be embossed such that a part thereof protrudes from the outside to the inside and the other part protrudes from the inside to the outside. For example, of the regions of the laminated sheet ₁₁₀₀ , with the closing seal portion 110b as a reference, the region located on _one side is the front side region, and the other side is the back side region. _˜110α2 is a mountain fold line embossed so as to protrude toward the outside of the tube container 100, and the valley fold embossed so that the crease line in the back side area protrudes toward the inside of the tube container 100. It can also be a ruled line.

Next, as shown in FIG. 1, the tube container 100 preferably further includes a screw cap 130 that can be attached and detached by screwing onto the ejection tube portion 121 of the ejection port portion 120 .

Also, the tube container 100 may be provided with a hinge cap instead of the screw cap 130 . When a hinge cap is provided, it may be attached to the spout portion 121 by screwing. Alternatively, a rib may be provided on the outer surface of the pouring tube portion 121 instead of the screw thread, and the hinge cap may be attached to the pouring port portion 121 by fitting through the rib.

When the tube container 100 is provided with a cap such as a screw cap or a hinge cap, it becomes easy to reseal the tube container 100 after opening. In addition, the screw cap 130 can be stored by turning it upside down. Even when inverted in this way, the tube container 100 does not bend. Even when the container is turned upside down after part of the contents are poured out, the container does not inadvertently bend.

Furthermore, the inside of the pouring tube part 121 may be closed by a partition wall in order to keep the inside of the tube container 100 sealed when the tube container 100 is in an unopened state. When a partition is provided, it is preferable to provide a circular half-cut along the inner periphery of the pouring cylinder part 121 and to provide a pull ring connected to the portion surrounded by the half-cut. With this configuration, when the tube container 100 is opened, the user pulls the pull ring to break the half-cut portion of the partition wall, thereby removing a portion of the partition wall surrounded by the half-cuts and leaving the body portion. An opening may be formed for pouring contents from 110 into pour tube 121 .

A method for manufacturing the tube container 100 according to this embodiment will be described below.

FIG. 6 is an explanatory plan view of the laminated sheet 1100 that constitutes the body portion 110. In this figure, a belt _- like region _110c2 near the upper edge corresponds to the portion welded to the spout portion 120. The vicinity of the edge on the lower side in FIG. 6 corresponds to the portion that becomes the closing seal portion 110b. In addition, a central region 110A sandwiched between two dashed double-dot lines 110x is a portion that is the front side region of the tube container 100, and regions 110B adjacent to both sides of the region 110A are regions on the back side of the tube container 100. This is the part that becomes 6 is the outer surface of the body portion 110. As shown in FIG.

By pattern-coating the strip _- shaped region _110a2 along the left edge 110a1 of the laminated sheet 1100 and the strip _- shaped region _110c2 adjacent to the upper edge of the laminated sheet 11000 with a heat-fusible coating agent, the above-described thermal bonding is achieved. A weldable coating layer is formed. The strip-shaped region _110a2 is formed by rolling the laminated sheet 1100 into a tubular shape, and then the inner surfaces of the strip-shaped regions along the opposing parallel left edge 110a1 and right edge _{110a3 are} brought into contact with _each other to form a back-pasted seal portion. 110a is formed, and when the back-pasted seal portion 110a is folded along the trunk portion 110, the outer surface of the back-pasted seal portion 110a and the outer surface of the trunk portion 110 are in contact with each other. In addition, the band-shaped region _110c2 is a portion that is welded to the flat plate portion 122 when joining the cylindrical laminated sheet ₁₁₀₀ to the flat plate portion 122 of the outlet portion 120, and is folded to form the pleats 110c. Corresponds to the part to be formed.

_The laminated sheet 1100 is provided with embossed ruled lines 110α ₁ to 110α ₂ . Of these embossed ruled lines 110α ₁ to 110α ₂ , the embossed ruled line 110α ₁ is continuously provided from the spout portion 120 to the closing seal portion 110b, and furthermore, the central region 110A and the region 110B adjacent thereto. It is set across the On the other hand, the embossed ruled line _110α2 starts from the spout portion 120 but does not reach the closing seal portion 110b, and is arranged only in the central region 110A.

These embossed ruled lines 110α ₁ to 110α ₂ may be embossed so as to protrude from the outside toward the inside, or conversely, embossed so as to protrude from the inside toward the outside. It can be. Alternatively, the embossed ruled line _110α1 may be embossed so as to protrude from the outside toward the inside, and the embossed ruled line _110α2 may be embossed so as to protrude from the inside toward the outside. is. These embossed ruled lines 110α ₁ to 110α ₂ can be formed by well-known embossing.

As will be described later, the embossed ruled lines can be formed after processing the laminated sheet ₁₁₀₀ into a cylindrical shape, or can be formed after the _spout portion 120 is attached to the cylindrical laminated sheet 1100. It is possible. However, when the embossed ruled lines are formed after processing the laminated sheet ₁₁₀₀ into a cylindrical shape, embossed ruled lines corresponding to each other are formed in both the front side region 110A and the back side region 110B. For example, an embossed ruled line protruding from the outside to the inside is formed in the front side region 110A, and a embossed ruled line protruding from the inside to the outside is formed in the back side region 110B at a corresponding position.

Next, FIG. 7 is an explanatory cross-sectional view for explaining the process of manufacturing the body. In FIG. 7, the laminated sheet ₁₁₀₀ is sequentially processed while being conveyed by a conveying device (not shown).

First, as shown in FIG. 7(a), the lamination sheet 1100 is wound around a plate-like jig 141, and a predetermined range including the left edge 110a1 and the belt _- like region _110a2 of the lamination sheet and the right edge _{110a3 are} formed. and a predetermined range including . As described with reference to FIG. 7, the strip _- shaped region _110a2 along the left edge 110a1 is provided with a heat-fusible coating layer.

Next, as shown in FIG. 7(b), using a guide 142 having an inverted T-shaped cross section, the belt-like region _110a2 and the belt-like portion along the right edge _110a3 are raised, and the guide 142 is sandwiched between them. The respective inner surfaces are made to face each other in a palm-to-palm shape.

Next, as shown in FIG. 7(c), using a flat guide 143, the inner surfaces of the laminated sheets ₁₁₀₀ are folded about 90 degrees to form three laminated sheets ₁₁₀₀ . are superimposed.

In this state, as shown in FIG. 7(d), sealing is performed using a seal bar 144 to weld the inner surfaces of the laminated sheet 1100 to each other to form the back-pasted seal portion 110a, and at the same time, the band _- shaped region _110a2 is formed. The back seal portion 110a can be welded to the outer surface of the body portion 110 by the heat-fusible coating layer provided on the body portion 110a.

As described above, it is also possible to form _embossed ruled lines on the cylindrical laminated sheet 1100 . In this case, first, it is flattened. At this time, the bending line formed by this crushing is the same as the extension line of the bending line formed by flattening to form the closing seal portion. By embossing the cylindrical laminated sheet ₁₁₀₀ in a flattened state in this manner, embossed ruled lines can be formed. The embossed ruled lines formed by _embossing the flattened cylindrical laminated sheet 1100 are, for example, lines protruding from the inside to the outside of the tubular laminated sheet 1100 in the front side region _110A . In the back side region 110B, on the contrary, it is a line protruding from the outside to the inside of the tubular laminated sheet _1100. As shown in FIG. Finally, the cylindrical laminated sheet 1100 that has been flattened is returned to a cylindrical shape, _whereby the tubular body 110 can be manufactured.

Next, FIGS. 8(a) to 8(c) are cross-sectional views for explaining the method of welding the body portion 110 and the spout portion 120 together.

First, as shown in FIG. 8A, a tube-shaped body 1 and a separately molded spout 120 are prepared, and the flat plate portion 122 of the spout 120 is inserted from the end of the body 110. do. It is preferable that a separately molded screw cap 130 is screwed into the spout portion 120 so as to be integrated therewith. As described with reference to FIG. 6, the band-like region _110c2 near the upper edge is provided with a heat-fusible coating layer.

Next, as shown in FIG. 8B, a jig 145 inserted from the other end of the trunk portion 110 is used to support the inner surface of the flat plate portion 122, and claws (not shown) are used to hold the trunk portion 110. A portion within a predetermined range from the upper edge is folded back in the direction of the white arrow shown in FIG. 8(b) and pressed. A plurality of claws for folding back the body portion 110 are provided at predetermined intervals in the circumferential direction of the spout portion 120 .

Next, as shown in FIG. 8(c), a predetermined range from the edge 24 of the trunk portion 110 is sandwiched between a welding device 146 such as an ultrasonic horn and a jig 145. Next, as shown in FIG. A plurality of intermittently arranged claws hold a predetermined range from the upper edge of the body 1 and press it with the welding device 146, thereby forming a predetermined range from the upper edge of the body 110 (heat-welding coating). The band-shaped region 110c (the portion including ₂ ) provided with the layer can be folded to form the pleats 110c while being welded to the flat plate portion 122. FIG. Thereby, the trunk|drum 110 and the spout part 120 can be joined.

As described above, it is also possible to form embossed creases on the body 110 after joining the body 110 and the spout 120 together. The forming method is the same as the method for forming _embossed ruled lines on the cylindrical laminated sheet 1100 .

Then, the body portion 110 to which the spout portion 120 is attached is filled with the contents, and the end portion of the body portion 110 is flattened and sealed to provide a closing seal portion 110b. By closing, a package using the tube container 100 can be obtained.

As a method for welding the barrel portion 110 and the spout portion 120 when manufacturing the tube container 100, ultrasonic welding, high-frequency welding, heat seal welding, hot air welding, compression molding of the barrel insert, or the like can be used. However, it is preferable to employ ultrasonic welding because it is less affected by the heat insulating properties of paper.

As described above, in the tube container ₁₀₀ according to the present embodiment, the trunk portion ₁₁₀ is composed of the laminated sheet 1100 having the paper 1101 and the sealant ₁₁₀₄ , so that the amount of resin used can be reduced. can.

Further, since the body portion 110 is reinforced by the embossed ruled lines 110α ₁ to 110α ₂ , the container 100 is excellent in self-sustainability and handleability, and does not bend.

In addition to this, the back seal portion 110a formed on the body portion 110 is welded to the outer surface of the body portion ₁₁₀ , and the overlapping portion 13 of the laminated sheet 1100 formed on the flat plate portion 122 is mutually bonded. Since the seal portion 110a and the overlapping portion 110c1 are welded, there is no paper splash on the back seal portion 110a and the overlapping portion _110c1 , and the tube container 100 with excellent cosmeticity can be provided.

[Second embodiment]
A second embodiment will be described with reference to FIGS. 9 to 25. FIG. In the second embodiment, the spout portion 220 is composed of two parts, an ejection tube portion 221 and a flat plate portion 222, and both the ejection tube portion 221 and the flat plate portion 222 are laminated sheets containing paper. 2 is an example of a configured tube container 200. FIG.

FIG. 9 relates to the second embodiment of the present invention, and is an explanatory exploded perspective view of a tube container with a cap as seen from the substantially front direction of the closing seal portion, and FIG. 10 is an explanation along line 2x-2x in FIG. 2 is an enlarged cross-sectional view for use. FIG.

As described above, the paper tube container 200 is composed of the tubular body 210 and the spout portion 220, and the spout portion 220 is made up of two parts, the spout cylinder portion 221 and the flat plate portion 222. It is Both the pouring tube portion 221 and the flat plate portion 222 are formed of laminated sheets mainly made of paper.

The pouring cylinder part 221 is for pouring out the contents accommodated in the trunk part 210 to the outside, and has a tubular shape. As shown in FIG. 10, a flange 221c is provided at one end in the axial direction (vertical direction in FIG. 10) of the pouring tube portion 221, and an outer peripheral portion 221b is provided at the other end. Although the details will be described later, the flange 221c is formed by rolling a blank sheet 2210 for forming the pouring cylinder portion ₂₂₁ into a cylinder and curling a predetermined range outward from one opening end (end edge). It is formed by crushing the curled portion in the vertical direction. The extraction cylinder part 221 is a part for sealing to the flat plate part 222 . In addition, the outer peripheral portion 221b is formed by curling a predetermined range outward from the other open end (end edge) of the blank sheet ₂₂₁₀ for forming the pouring tube portion 221, which is rolled into a cylindrical shape. It is formed by crushing along the outer peripheral surface of the pouring cylinder part 221 . The outer peripheral portion 221b is a portion for protecting the end surface of the blank sheet ₂₂₁₀ forming the pouring tube portion 221 and for imparting strength to the upper end of the pouring tube portion 221 . In addition, as shown in FIG. 11, a pair of blank sheets 2210 rolled up when forming the pouring tube part ₂₂₁ are overlapped and sealed in the vicinity of a pair of edge edges of the blank sheet 2210. 221a is formed. The shape of the pouring cylinder part 221 is not particularly limited, and may be circular, elliptical, oval, track-shaped, polygonal, or the like.

When the content of the paper tube container 200 is difficult to permeate the paper, the pouring cylinder part 22
1 may not be provided with the outer peripheral portion 221b. Alternatively, depending on the type and form of the contents, instead of providing the outer peripheral portion 221b at the end of the pouring tube portion 221, the blank sheet ₂₂₁₀ for forming the pouring tube portion 221 that is rolled into a cylindrical shape may be extended from the edge of the blank sheet 2210. After curling the range inward, the formed curled portion may be crushed along the inner peripheral surface of the pouring tube portion 221 .

The flat plate portion 222 is a flat plate-shaped member for connecting the pouring tube portion 221 and the body portion 210 . The flat plate portion 222 is provided with an opening 222a having substantially the same shape as the cross section of the extraction tube portion 221, and the flat plate portion 222 has an annular shape as a whole. The opening 222a provided in the flat plate portion 222 is fitted so as to pass through the pouring tube portion 221, and one surface of the flat plate portion 222 facing 221c is sealed to the flange 221c of the pouring tube portion 221, The extraction cylinder part 221 and the flat plate part 222 are mutually fixed and integrated.

A folded portion 222b is formed on the outer periphery of the flat plate portion 222 by folding back an annular portion including the entire outer peripheral edge of the blank sheet for forming the flat plate portion 222 to the upper surface side. The shape of the flat plate portion 222 is not particularly limited as long as it can seal the body portion 210, and may be circular, elliptical, oval, track-shaped, polygonal, or the like.

The pouring tube portion 221 and the flat plate portion 222 constitute the pouring port portion 220 by being fixed and integrated with each other via the flange 221c. By forming both the ejection tube portion 221 and the flat plate portion 222 from sheets mainly made of paper, the amount of resin used can be reduced compared to the resin ejection port portion 120 in the first embodiment.

As with the body portion 210 in the first embodiment, the body portion ₂₁₀ is formed by, for example, joining the inner surfaces of the band-shaped portions including the pair of edges of the laminated sheet 2100 together in a palm-to-face manner and welding them together. A tube-shaped trunk portion 210 is formed by forming the back seal portion 210a. One end (the lower end in FIG. 9) of the body portion 210 is flattened and sealed, and this seal forms a closed seal portion 210b. On the other hand, the portion near the other end (upper end in FIG. 9) of the trunk portion 210 is folded, and the outer surface of the flat plate portion 222, that is, the end of the pouring cylinder portion 221 among the both surfaces of the flat plate portion 222, is folded. It is sealed on the side face. Since the laminated sheet 2100 constituting the trunk portion ₂₁₀ is _folded and sealed on the outer surface of the flat plate portion 222, a plurality of pleats 210c are formed by folding the laminated sheet 2100. be. Also, in the trunk portion 210, a backing seal portion 210a is formed by overlapping and pasting portions near the edges of the sheet when processing the sheet into a cylindrical shape. Like the backing seal portion 110a of the first embodiment, the backing seal portion 210a may be folded along the outer surface of the body portion 210 and attached to the body portion 210, or may not be attached. can be The method of adhering the backing seal portion 210a to the trunk portion 210 is not particularly limited, and the laminate sheet 2100 constituting the trunk portion 210 is _welded via a heat-sealing resin that is provided on the entire surface or partially. Alternatively, the two may be adhered via an adhesive such as hot melt.

As shown in FIG. 9, similar to the body portion 110 of the first embodiment, this body portion 210 is embossed with two ruled lines 210α ₁ to 210α ₂ extending spirally. Since the stiffness of the laminated sheet 2100 is reinforced by the embossed ruled lines _{210α 1} to 210α ₂ , even when the tube container 200 is turned upside down after part or all of the contents have been poured out, the tube container 200 may be inadvertently I can't bend my back.

9 and 10, the paper tube container 200 further includes a cap 230 that can be attached to and detached from the pouring tube portion 221. As shown in FIGS. Since the paper tube container 200 has the cap 230, the paper tube container 200 can be resealed after being opened, and can be turned upside down with the cap 230 downward.

A cap 230 according to this embodiment includes a cylinder portion 232 and a lid portion 231 . Both the cylindrical portion 232 and the lid portion 231 are formed of a sheet mainly made of paper.

The tubular portion 232 is a member forming the peripheral wall of the cap 230 and has a tubular shape. A connecting portion 232b is provided at one end of the cylindrical portion 232 in the axial direction (vertical direction in FIGS. 9 and 10), and an inner peripheral portion 232c is provided at the other end. Although the details will be described later, the connecting portion 232b is formed by rolling a blank for forming the cylindrical portion 232 into a cylindrical shape, curling a predetermined range inward from one end edge, and then crushing the formed curled portion in the vertical direction. It is formed by The connecting portion 232b is a portion for sealing the lid portion 231. As shown in FIG. In addition, the inner peripheral portion 232c is formed by rolling a blank for forming the tubular portion 232 into a tubular shape, curling a predetermined range from the other edge inward, and then inserting the formed curled portion _232b1 into the inner peripheral portion of the tubular portion 232. Formed by squeezing along a surface. The inner peripheral portion 232c is a portion for protecting the end surface of the blank sheet forming the cylindrical portion 232 and for imparting strength to the end portion of the cylindrical portion 232. As shown in FIG. When the connection portion 232b is formed at the end portion of the cylindrical portion 232 as in the present embodiment, the inner diameter of the inner peripheral portion 232c is made smaller than the outermost diameter of the outer peripheral portion 221b of the spout portion 220 so that the cap 230 The inner peripheral portion 232c of the spout portion 220 and the outer peripheral portion 221b of the spout portion 220 can function as a locking mechanism that prevents the cap 230 from coming off. Further, as shown in FIG. 9, the tubular portion 232 is formed with a backing seal portion 232a formed by overlapping and sealing the vicinity of a pair of edges of a blank rolled when forming the tubular portion 232. As shown in FIG. The shape of the tubular portion 232 is not particularly limited, and may be circular, elliptical, oval, track-shaped, polygonal, or the like. .

If the content of the paper tube container 200 does not easily permeate the paper, the cap 230 may not have the inner peripheral portion 232c. Alternatively, depending on the type and form of the contents, instead of providing the cap 230 with the inner peripheral portion 232c, a blank for forming the cylindrical portion 232 that is rolled into a cylindrical shape is curled outward in a predetermined range from the edge thereof, and then formed. The curled portion may be crushed along the outer peripheral surface of the tubular portion 232 .

The lid portion 231 is a plate-like member that is fitted inside the tubular portion 232 and closes the end portion of the tubular portion 232 . The lid portion 231 is sealed to a connecting portion 232b provided at the end portion of the cylindrical portion 232. As shown in FIG.

Next, FIG. 11 is an explanatory cross-sectional view of a blank sheet ₂₂₁₀ forming the pouring tube portion 221 of the pouring port portion 220. As shown in FIG.

The blank sheet 221-0 is made by laminating a base film layer _220-2 , _a barrier layer _220-3 and a sealant layer _220-4 in this order _{on one} side of the paper 220-1, and a thermoplastic resin layer on the other side of the paper 220-1. ₂₂₀₅ is laminated.

As the paper 2201, it is preferable to use _single glazed kraft paper or double glazed kraft paper. Also, as the paper forming the paper ₂₂₀₁ , waterproof paper or greaseproof paper may be used as needed.

_The basis weight of this paper 2201 is 50-500 g/m ² , preferably 100-300 g/m ² . If the basis weight of the paper 220 ₁ is less than 50 g/m ² , a curled portion, which will be described later, cannot be formed, and the strength of the molded ejection tube portion 221 is not sufficient. Further, when the basis weight of the paper exceeds 500 g/m ² , it becomes difficult to curl, which is undesirable in terms of resource saving and manufacturing cost.

The base film layer _220-2 is a layer that provides the blank sheet _221-0 with heat resistance and physical strength such as toughness when heated. The base film layer _220-2 is also a layer that serves as a base material for the barrier layer _220-3 . _The material of the film that constitutes the base film layer 2202 is not particularly limited, but from the viewpoint of heat resistance and physical strength, it is preferable to use a stretched film of polypropylene, polyester, polyamide, or the like. However, the base film layer ₂₂₀₂ may be made of paper.

The barrier layer ₂₂₀₃ is a functional layer that blocks oxygen, water vapor, etc. to improve the storage stability of the contents. The barrier layer 2203 is _, for example, a vapor deposition film of an inorganic compound such as silica or alumina, a vapor deposition film of a metal such as aluminum, a metal foil such as aluminum, a plate-like mineral and/or a coating film of a barrier coating agent containing a barrier resin. It can be composed of one or more types. Ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), etc. can be used as the barrier resin used for the barrier coating agent, and binder resins other than the barrier resin can be used as appropriate for the barrier coating agent. blended. _The barrier layer 2203 may be laminated in advance _on the base film layer 2202 to constitute a barrier film, or may be provided as a single layer film.

Although the material of the sealant layer ₂₂₀₄ is not particularly limited, thermoplastic resins such as polypropylene, polyethylene, cyclic polyolefin, and polyester are preferable. For the sealant layer ₂₂₀₄ , a resin having a softening temperature higher than that of the base film layer 2202 by ₂₀ ° C. or more is used. If the softening temperature of the sealant layer ₂₂₀₄ is not higher _than the softening temperature of the base film layer 2202 by ₂₀ ° C. or more, the base film layer 2202 is likely to soften and pinholes are generated during sealing, which is preferable. do not have. The softening temperature of the sealant layer 2204 is preferably higher than the softening temperature of the base film layer ₂₂₀₄ by ₄₀ ° C. or more.

The thermoplastic resin layer ₂₂₀₅ is a layer formed by laminating or coating a thermoplastic resin that can be welded to the resin that constitutes the sealant layer ₂₂₀₄ . _The thermoplastic resin layer _220-5 may be laminated on the _entire surface of the paper 221-1 or partially laminated on the surface of the paper 221-1. By laminating the thermoplastic resin layer ₂₂₀₅ , it becomes possible to strengthen the welding of the curled portion during the curl forming described later.

Note that the blank sheet 221-0 may have a sealant layer _221-4 laminated _on at least _one side of the paper 221-1 (the inner side of the paper tube container ₂₀₀ ). One or more of the barrier layer _221-3 and the thermoplastic resin layer _221-5 may be omitted. In addition, a coating for imparting water resistance or oil resistance, printing for display, or overcoat varnish coating for protection of printing may be appropriately applied.

Next, the flat plate portion 222 of the spout portion 220 can also be formed of a blank sheet having the same layer structure as the blank sheet ₂₂₁₀ forming the spout portion 221 . That is, the blank sheet for forming the flat plate portion 222 is also a multi-layer sheet in which a base film layer, a barrier layer and a sealant layer are laminated in this order on one side of paper, and a thermoplastic resin layer is laminated on the other side of the paper. can be The base film layer, barrier layer, sealant layer and thermoplastic resin layer are the same as the base film layer 220 ₂ , barrier layer 220 ₃ , sealant layer 220 ₄ and thermoplastic resin layer 220 ₅ of the blank sheet 221 ₀ , respectively. can be However, unlike the blank sheet 2210, the blank sheet for forming the flat plate portion 222 can use paper having a basis weight of 50 to 1000 g/ ^{m 2} _. If the basis weight of the paper is less than 50 g/m ² , the strength of the paper tube container 100 will be insufficient. On the other hand, if the basis weight exceeds 1000 g/m ² , vibrations during ultrasonic sealing are absorbed by the paper, making it difficult to achieve good welding, which is undesirable in terms of resource saving and manufacturing cost. Desirably, the basis weight is 100 to 300 g/m ² .

Also in the blank sheet for forming the flat plate portion 222, one or more layers of the base film layer, the barrier layer and the thermoplastic resin layer can be omitted, similarly to this blank sheet ₂₂₁₀ forming the ejection tube portion 221. be. Moreover, coating for imparting water resistance or oil resistance, printing for display, and overcoat varnish coating for printing protection can also be applied.

Next, FIG. 12 is an explanatory cross-sectional view of the laminated sheet ₂₁₀₀ forming the body portion 210 of the tube container 200. As shown in FIG. This laminated sheet _210-0 has a base film layer 210-2, a barrier layer _210-3 and a sealant layer _210-4 laminated in this order _{on one} side of the paper 210-1, and a paper protective layer 210-5 _on the other side of the paper _210-0 . is laminated, and an ink layer _210-6 and an overcoat varnish layer _210-7 are further laminated _on the paper protective layer 210-5.

The base film layer 210 ₂ , the barrier layer 210 ₃ , and the sealant layer 210 ₄ of the laminate sheet 210 ₀ for forming the trunk portion 210 correspond to the base film layer 220 ₂ , the barrier layer 220 ₃ , and the sealant layer 220 3 of the blank sheet 221 ₀ , respectively. It may be the same as layer ₂₂₀₄ . However, unlike the blank sheet ₂₂₁₀ , the paper 2101 in the laminated sheet 2100 for forming the body portion 210 is desirably paper with _a basis weight of 30 to 300 g/ ^{m 2} _. If the basis weight of the paper 210 ₁ is less than 30 g/m ² , the stiffness of the body portion 210 is insufficient. In order to compensate for stiffness, for example, it is necessary to increase the thickness of the resin film provided inside the paper 2101, but this leads to _an increase in the resin ratio, which is not desirable in terms of reducing the environmental load. Further, if the _basis weight of the paper 2101 used for the sheet for forming the body portion 3 exceeds 300 g/m ² , it is not preferable because the stiffness and heat insulating properties of the paper degrade the tube-forming, moldability, and weldability. More preferably, the basis weight is 50 to 150 g/m ² .

Next, the paper protection layer 210-5 is _a layer for protecting the paper _210-1 constituting the laminated sheet _210-0 from adhesion of contents and stains. The material and formation method of the paper protective layer ₂₁₀₅ are not particularly limited, but the paper protective layer ₂₁₀₅ can be laminated by extrusion coating of a thermoplastic resin or coating with a coating agent such as a water-resistant agent or an oil-resistant agent. The thickness of the paper protective layer 2105 is preferably _0.2-50 μm, more preferably 1-20 μm. If the thickness of the paper protective layer ₂₁₀₅ is less than 0.2 μm, pinholes may occur in the paper protective layer ₂₁₀₅ , and sufficient paper protection may not be obtained. Moreover, if the thickness of the paper protective layer 2105 exceeds ₅₀ μm, it is not preferable in terms of the amount of resin used and the manufacturing cost.

The ink layer ₂₁₀₆ is a layer applied by printing for various displays, and the overcoat varnish layer ₂₁₀₇ is a layer for imparting wear resistance and the like. The stacking order of the ink layer ₂₁₀₆ and the overcoat varnish layer ₂₁₀₇ may be reversed from that shown in FIG. Moreover, the overcoat varnish layer _210-7 may also _serve as the paper protective layer 210-5.

In addition, in order to reduce the resin ratio of the tube container 200, paper that accounts for the total amount of the blank sheet 221 ₀ for forming the pouring tube portion, the blank sheet for forming the flat plate portion, and the laminated sheet 210 ₀ for forming the trunk portion that constitutes the tube container 200 It is preferable that the ratio is 50% or more.

An example of a method for manufacturing the paper tube container 200 according to this embodiment will be described below.

13 to 21 are explanatory sectional views for explaining the manufacturing process of the tube container 200. FIG. Among them, FIGS. 13 to 19 show the manufacturing process of the spout portion 220 composed of the spout tube portion 221 and the flat plate portion 222 .

As shown in FIG. 13, first, a blank sheet ₂₂₁₀ for forming the pouring cylinder portion is prepared. In FIG. 13, the portion of the blank sheet ₂₂₁₀ within a predetermined range from the pair of edges corresponds to the portion where the blank sheet ₂₂₁₀ is rolled into a cylindrical shape and overlapped and bonded. A portion _221b1 within a predetermined range from the upper end of the blank sheet 2210 corresponds to a portion that is curled to form the outer peripheral portion 221b, and _a portion 221c1 within _a predetermined range from the lower end is for forming the flange 221c. corresponds to the part that is curled.

Next, as shown in FIG. 14, the strip-shaped portion _221a2 including the edge _221a1 of the blank sheet 2210 and the strip _- shaped portion _221a4 including the opposite edge _221a3 are folded in opposite directions (hemming process). ).

Next, as shown in FIG. 15, the _hemmed blank sheet 2210 is rolled into a cylindrical shape, the folded belt-like portions _221a2 and _221a4 are engaged, and the pair of edges _221a1 and 221a3 _are separated from each other. A predetermined range of portions, that is, strip portions _221a2 and _221a4 are overlapped and sealed. Thereby, a cylindrical intermediate body 221x shown in FIG. 16 is formed. A backing seal portion 221a is formed in the intermediate body _221x by stacking and sealing _221a2 and 221a4. In this example, four layers of blank sheets 2210 are laminated and sealed at the backing seal portion _221a . However, the strip-shaped portions _221a2 and _221a4 were not overlapped, that is, the blank sheet 2210 was rolled and the edges _221a1 and 221a3 _were butted against _each other, or the edges _221a1 and 221a3 _were separated. The overlapping portion may be sealed to form the backing seal portion 221a. In this case, the blank sheet ₂₂₁₀ is laminated in three layers. No matter which method of forming the backing seal portion 221a is adopted _, the edges _221a1 and _221a3 of the blank sheet 2210 are folded and sealed inside the backing seal portion _221a . and _221a - ₃ end faces of the blank sheet 221-0 are protected.

Next, by curling outward a predetermined range from the upper end of the intermediate body _221x and _a predetermined range from the lower end of the intermediate body 221x, as shown in FIG. Form body 221y. The upper and lower ends of the intermediate body 221x are caught inside the curled portions 221b- ₁ and 221c- ₁ in this step. The curled portions 221b- ₁ and 221c- ₁ can be formed by a well-known processing method using a mold.

Next, the curled portion _221c1 of the intermediate body 221y is crushed in the axial direction (vertical direction in FIG. 17), and the curled portion _221b1 is crushed along the outer peripheral surface of the intermediate body 221y, thereby obtaining a shape as shown in FIG. , forming a spout tube 221 having a flange 221c and an outer peripheral portion 221b. The curled portions 221b- ₁ and 221c- ₁ can be crushed, for example, by applying pressure while irradiating ultrasonic waves using an ultrasonic horn. If it does not affect the workability in the post-process, the step of crushing _one or both of the curled portions _221b1 and 221c1 may be omitted, or the curled portions 221b1 and 221c1 may be fitted into a flat plate portion 222 shown in FIG. One or both of the curled portions 221b ₁ and 221c ₁ may be crushed in the step of forming or in a subsequent step.

On the other hand, a flat plate portion 222 shown in FIG. The flat plate portion 222 can be formed by punching a sheet for forming the flat plate portion 222 into a predetermined shape, and folding back an annular portion including the entire circumference of the outer peripheral edge to provide a folded portion 222b. In the punched sheet, an opening 222a having substantially the same cross-sectional shape as the pouring tube portion 221 is formed at the same time as the punching or in a separate process.

Next, the pouring cylinder portion 221 is fitted into the opening 222a of the flat plate portion 222, and as shown in FIG. do. Through this process, the spout portion 220 in which the spout tube portion 221 and the flat plate portion 222 are integrated can be obtained.

Since both the pouring tube portion 221 and the flat plate portion 222 are formed bodies of sheets mainly made of paper, in the process shown in FIG. It is possible to fit the pouring tube portion 221 into the opening 222a of the flat plate portion 222 while deforming the vicinity of the portion 222a. However, in order to facilitate fitting of the pouring tube portion 221 into the flat plate portion 222, the _curled portion _221b1 shown in FIG. The curled portion _221b1 may be formed and crushed after the portion 222 is sealed.

20 and 21 show the manufacturing process of the paper tube container 200 in which the body portion 210 is sealed to the flat plate portion 222. As shown in FIG.

The trunk portion 210 is formed by a method similar to that of the trunk portion 110 in the first embodiment. That is, first, a laminate sheet 2100 for forming a trunk section, on which the embossing ruled lines _{210α 1} to 210α ₂ are embossed, is prepared. Then, the inner surfaces of the band-shaped portions including the pair of edges of the trunk forming laminated sheet ₂₁₀₀ are brought into contact with each other and welded to form a cylindrical shape. In this embodiment, since a sheet having a thickness (total thickness) of 30 to 300 μm is used as the body forming laminated sheet ₂₁₀₀ , it is processed into a cylindrical shape using a bag making machine, a pillow/stick packaging machine, or the like. can do.

Then, as shown in FIG. 20, after inserting the flat plate portion 222 into the cylindrical body portion 210, as shown in FIG. to seal. At this time, a portion within a predetermined range from the end of the trunk portion 210 is sealed to the entire folded portion 222b and to a portion of the upper surface of the flat plate portion 222 along the entire inner circumference of the folded portion 222b. As a result, the end face of the edge portion of the sheet forming the flat plate portion 222 is sealed inside the bonded portion between the trunk portion 210 and the flat plate portion 222 and protected. The trunk portion 210 does not necessarily have to be sealed to the inner peripheral portion of the folded portion 222b of the flat plate portion 222, and only the folded portion 222b may be sealed. By sealing across the folded portion 222b and its inner peripheral portion, the welding between the trunk portion 210 and the flat plate portion 222 can be strengthened.

Through the above steps, the paper tube container 200 can be manufactured.

Next, FIGS. 22 to 24 are cross-sectional views for explaining the manufacturing process of the cap.

First, a blank sheet 2320 for forming the cylindrical portion ₂₃₂ is prepared by cutting a sheet mainly made of paper into a rectangular shape. As the blank sheet ₂₃₂₀ for forming the tubular portion 232, for example, the same blank sheet ₂₂₁₀ for forming the pouring tubular portion can be used. Then, using this blank sheet ₂₃₂₀ , by repeating the same process as the process for forming the pouring cylinder part 221 (the process described in FIGS. 13 to 15), the same process as shown in FIG. 15 is obtained. to form a cylindrical intermediate body 232x (see FIG. 22). In the intermediate body _232x , a backing seal portion 232a is formed by overlapping and sealing a predetermined range of portions from a pair of edges of the blank sheet 2320. As shown in FIG.

Next, by curling inwardly a portion within a predetermined range from one upper end of the intermediate body 232x and a portion within a predetermined range from its lower end, curled portions _232b1 and _232c1 are formed as shown in FIG. Intermediate 232y having The curled portions 232b ₁ and 232c ₁ can be formed by a well-known processing method using a mold.

Next, as shown in FIG. 24, the separately manufactured cover portion 231 is fitted into the cylindrical portion of the intermediate body 232y. The lid portion 231 can be formed, for example, by using the same blank sheet as the flat plate portion forming blank sheet and punching it into a shape corresponding to the cap 230 .

Next, the curled portion _232b1 on the upper end side is axially crushed and sealed to the lid portion 231, and the curled portion _232c1 on the lower end side is crushed along the inner peripheral surface of the intermediate body 232y. As a result, as shown in FIG. 24, the cylindrical portion 232 and the lid portion 231 are integrated via the connection portion 232b in which the curl portion _232b1 is crushed, and the cap 230 having the inner peripheral portion 232c is obtained. be able to. When the curled portions _232b1 and _232c1 are crushed, the upper and lower ends of the intermediate body 232x shown in FIG. be. The curled portions _232b1 and _232c1 may be crushed in advance before sealing the lid portion 231 to the intermediate body 232y.

In this example, the curled portion _232c1 is formed by curling the lower end of the intermediate body 232x shown in FIG. You may crush along the outer peripheral surface of the body 232y. In this case, the blank sheet 2320 for forming the cylindrical portion 20 is formed by performing the hemming process only in the vicinity of the inner edge of the backing seal portion 232a when fabricating the intermediate body _232x shown in FIG. End faces can be protected.

As described above, in the tube container 200 according to the present embodiment, the body portion 210, the pouring tube portion 221 of the pouring port portion 220, and the flat plate portion 222 are all formed of sheets mainly made of paper. The amount of resin used can be reduced compared to conventional resin tube containers.

Moreover, by providing a barrier layer on the sheet forming the pouring tube portion 221 and the flat plate portion 222, it is easy to impart a barrier property to the pouring port portion 220 as well.

In addition, the cylindrical portion 232 forming the cap 230 is also hemmed and curled in the same manner as the pouring cylindrical portion 221 so that the end surface of the sheet is not exposed inside. Therefore, when the paper tube container 200 is resealed with the cap 230 , even if the contents such as liquid adhere to the inner surface of the cap 230 , the contents will flow from the end surface of the sheet forming the cylindrical portion 232 to the paper layer. can be prevented from penetrating.

Also, in the tube container 200 according to the present embodiment, as in the tube container 100 according to the first embodiment, the spiral embossing ruled lines 210α ₁ to 210α ₂ are provided, so that the tube container 200 can be turned upside down. Even if you store it as a

(Example 1)
As the laminated sheet 1100 for forming the body portion, a sheet was used in which paper (basis weight: 70 g/m ₂ ), polyester film (thickness: ¹² μm) and linear low-density polyethylene layer (thickness: 50 μm) were laminated in this order. Then, a large number of embossed ruled lines were formed in the unfolded state before forming the body forming laminated sheet ₁₁₀₀ into a tubular shape. All of these numerous embossed creases are straight lines that intersect at an angle of 30° with the center line of the body 110 of the tube container 100 . Moreover, all of these numerous embossed ruled lines protrude from the inside to the outside of the tube container 100 . These embossed ruled lines were formed at intervals of 10 mm on the entire surface of the laminated body forming sheet ₁₁₀₀ .

Next, as the spout portion 120, an integrally molded resin spout portion 120 was prepared.

Then, after forming the body-forming laminated sheet ₁₁₀₀ into a _tubular shape, as described with reference to FIG. to fix it.

Next, 80 ml of ketchup is used as the content, and the content is filled from the open opposite end, and then the open end is sealed to form the closed seal portion 110b to form the tube container containing the content. manufactured.

(Example 2)
A tube container containing contents was produced in the same manner as in Example 1, except that 80 ml of mayonnaise was used as the contents.

(Comparative example 1)
A tube container containing contents was manufactured in the same manner as in Example ₁ , except that the embossed ruled line was not formed on the body forming laminated sheet 1100 .

(Comparative example 2)
A tube container containing contents was manufactured in the same manner as in Example ₁ , except that the embossed ruled line was not formed on the body forming laminated sheet 1100 .

(evaluation)
The tube containers of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated from the viewpoint of the susceptibility to bending and the susceptibility of the contents to gather at the spout when inverted.

First, when the contents were not poured out from these tube containers and 80 ml of contents were accommodated, none of the tube containers was bent even when the tube containers were turned upside down.

When half of the content is poured out and the remaining amount is 80 ml, the tube containers of Comparative Examples 1 and 2 do not allow air to enter the inside of the tube container, and the body is flattened and, as a result, inverted. I began to break my back. When the tube containers of Comparative Examples 1 and 2 were turned upside down after using up the contents, almost all of the tube containers of Comparative Examples 1 and 2 buckled.

On the other hand, in the tube containers of Examples 1 and 2, when the contents were poured out, air was introduced accordingly, and the body returned to its original cylindrical shape. Therefore, not only when the tube container was turned upside down with a remaining amount of 80 ml after pouring out half of the contents, but also when the tube container was turned upside down with the contents used up, no bending occurred at all.

Next, when the contents were used up in this way and the tube container was left in an inverted state, in Example 1, the residual contents (ketchup) remaining inside the tube container gathered at the spout part due to its own weight, and further After being discharged from here, approximately half of the residual contents flowed out of the tube container.

Also, in Example 1, about 1/3 of the residual content (mayonnaise) flowed out of the tube container.

On the other hand, in Comparative Examples 1 and 2 in which the body was flattened, the residual contents (ketchup, mayonnaise) did not collect at the spout even when held in an inverted state.

₁₀₀ : Tube container 110: Body 110b: Closing seal part 1100: Laminated sheet for forming body part 1101: Paper _110α1 to _110α2 : Embossed ruled lines 120: Spout part 130: Cap ₂₀₀ : Tube container 210: Body _Part 210b: Closing seal part 2100: Laminated sheet for body part formation 2101: Paper _210α1 to _210α2 : _Embossed ruled lines 220: Spout part 221: Pour out tube part of the spout part ₂₂₁₀ : Pour out tube part Forming Blank Sheet 221 ₁ : Paper 222: Flat Plate Part 230 of Spout Portion: Cap 231: Lid Part 232: Cylinder Part

Claims (8)

A tube container comprising a tube-shaped body and a pouring port fixed to one end of the body, and having a closing seal portion formed by flattening and sealing one end of the body ,
the body is made of a laminated sheet containing paper;
A tube container characterized by being embossed with a ruled line intersecting the cross section when a plane perpendicular to the center line of the body is taken as a cross section. The tube container according to claim 1, having a plurality of ruled lines. 3. The tube container according to claim 1, wherein the cross section and the ruled line intersect at an arbitrary height. The tube container according to any one of claims 1 to 3, wherein the ruled line is provided in a spiral shape on the body. 5. The tube container according to any one of claims 1 to 4, wherein all of said ruled lines are embossed ruled lines so as to protrude toward the outside or inside of the tube container. Among the regions of the laminated sheet, when the region located on one side is defined as the front side region and the opposite side is defined as the back side region with reference to the closed seal portion, the ruled line is directed to the outside of the tube container in the front side region. 5. The ruled line according to any one of claims 1 to 4, wherein the ruled line is embossed so as to protrude, and the ruled line on the back side is a ruled line embossed so as to protrude toward the inside of the tube container. tube container as described. A back-pasted seal portion is formed on the body portion by abutting and sealing the laminated sheet in a palm-to-face shape,
7. The tube container according to any one of claims 1 to 6, wherein the backing seal portion is folded along the outer surface of the body portion and sealed to the body portion. The spout portion has a spout tube portion and a flat plate portion,
The pouring cylinder part has a cylindrical shape and has a flange at one end in the axial direction,
The flat plate portion has an annular flat plate shape provided with an opening having substantially the same shape as the cross section of the pouring cylinder portion,
one surface of the pouring tube portion is sealed to the flange of the pouring tube portion in a state in which the pouring tube portion penetrates the opening of the flat plate portion;
8. The tube container according to any one of claims 1 to 7, wherein the pouring tube portion is composed of a sheet mainly made of paper.

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