JP7439380B2 - tube container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tube container, and more particularly to a tube container that has scratch resistance on the outer surface of the container when it comes into contact with an external object.

The outer surface of conventional tube containers, especially laminate tube containers, is made of polyolefin, typically polyethylene, and there is little printing on the outer surface of the laminate tube containers. Printing is often done on the inner surface of polyethylene terephthalate film, which serves as an intermediate layer. See Patent Document 1 and Patent Document 2.
The surface of the unprinted outer polyethylene layer is soft and prone to scratches when rubbed against hard external objects.

In the manufacturing line for tube container packaging products, in which tube containers are filled with contents and sealed, there are , it is necessary to transport the tube container, and it comes into contact with guides and the like on the transport conveyor, causing friction. In addition, even within the filling/packaging equipment, the outer surface of the tube container may be damaged due to contact with the jigs that fix the tube container in each process within the equipment, or contact with various handling devices during transfer between each process. There is.

Japanese Patent Application Publication No. 2005-144812 Japanese Patent Application Publication No. 2005-178851

The present invention was made in view of this situation, and it improves the scratch resistance of the outer surface of the tube container, and prevents the outer surface of the tube container from being damaged during the filling and packaging process of the tube container as described above. The purpose of the present invention is to provide a tube container that can maintain its cosmetic appearance.

The tube container of the present invention includes a body having a pair of bonded ends and a shoulder, in which the laminate of the body has at least a first base layer, A second base material layer and a second sealant layer are laminated in this order, and a protective layer is further provided on the entire or at least part of the outer surface of the first base layer.

By providing a protective layer on the outer surface of the cylindrical body of the tube container, scratch resistance is improved. Furthermore, the coefficient of friction of the outer surface of the cylindrical body of the tube container is reduced.

According to the present invention, it is possible to provide a tube container in which the scratch resistance of the outer surface of the tube container is improved and the outer surface of the tube container is not damaged during the filling and packaging process of the tube container and can maintain its cosmetic appearance. can. Further, according to the present invention, the friction coefficient of the surface of the cylindrical body of the tube container is low, and it is possible to prevent the tube container from getting caught or falling on the line in the filling/packaging line for packaging products in tube containers. The stable operation of the filling and packaging line for tube container packaging products can contribute to reducing production costs.

It is a sectional view of the laminated body of the cylindrical body of the tube container of the first embodiment of the present invention. It is a sectional view of the laminated body of the cylindrical body of the tube container of the second embodiment of the present invention. It is a sectional view of the laminated body of the cylindrical body of the tube container of the third embodiment of the present invention. It is an explanatory view of the member of the cylindrical trunk of a tube container. It is a front view of a tube container. FIG. 2 is a front view of a packaged product of a tube container containing contents. This is the original material for the cylindrical body of the tube container.

Hereinafter, the present invention will be explained using the drawings. However, the present invention is not limited to these specifically illustrated forms or various specifically described structures.
Note that in each figure, the sizes and proportions of members may be changed or exaggerated in order to make it easier to understand. Further, for ease of viewing, parts unnecessary for explanation or repetitive symbols may be omitted.

<First embodiment of the present invention>
The tube container according to the first embodiment of the present invention will be described in detail below using drawings and the like.

First, referring to FIGS. 4 to 6, a tube container 30 made using the laminate 10 of the cylindrical body of a tube container according to the present invention will be described.

The tube container 30 is produced by providing a cylindrical body 31 including the laminate 10 of the cylindrical body of the tube container, and a synthetic resin on the cylindrical body 31 by a method such as compression molding or injection molding. A shoulder portion 35 and a mouth portion 36 are provided. Further, a cap 37 is attached to the mouth portion 36 of the tube container 30.

The tube container 30 having such a configuration is obtained through the following manufacturing process.

First, as shown in FIG. 4, a pair of bonded ends (hereinafter, both ends) of the laminate 10 of the cylindrical body of the tube container according to the present invention are used. ) 33A and 33B are overlapped, and the outer surface and inner surface of the overlapped portion are heat-sealed and bonded together to form the trunk bonded part 32, thereby manufacturing the cylindrical body part 31. do. Next, as shown in FIG. 5, the cylindrical body 31 is placed in a mold (not shown), and one opening (upper side) 34A of the cylindrical body 31 is subjected to compression molding, for example. The shoulder portion 35 and the mouth portion 36 are formed by a method such as injection molding. In this way, the shoulder portion 35 and the mouth portion 36 are integrally molded into one opening (upper side) 34A of the cylindrical body portion 31, thereby producing the tube container 30. Then, a cap 37 is attached to the mouth portion 36 of the tube container 30.

Next, from the other opening (lower side) 34B of the cylindrical body 31 of the tube container 30, an appropriate amount of other contents 38, such as mustard paste, wasabi paste, etc., is filled. Thereafter, the opening (lower side) 34B is welded to form the bottom seal portion 39, and a packaged product 30A including the tube container 30 filled with the contents 38 is obtained.

Next, with reference to FIG. 1, the laminated body 10 of the cylindrical body of the tube container from which the tube container 30 is manufactured will be explained. As shown in FIG. 1, the laminate 10 of the cylindrical body of a tube container includes a first base layer 11 and a first sealant layer 12 having heat-sealing properties, which are arranged in order from the outer surface to the inner surface. This is a laminate having two base material layers 13 and a second sealant layer 15.
A protective layer 16 is provided on the surface of the first base layer 13.

A protective layer 16 is formed on the outer surface of the first base layer 11 using a coater or ink such as OP varnish, and a desired coating layer is formed on the inner surface of the second base layer 13 using printing ink. An inner surface printed portion 13A including a pattern is formed. Note that the inner surface printed portion 13A may be provided on the outer surface of the second base material layer 13 using printing ink.

When a pattern is printed on the inner surface of the protective layer 16, it is preferable that the protective layer 16 is made of a see-through layer so that the pattern can be visually recognized from the outside.

The surface of the first base layer 11 forming the protective layer 16 needs to have appropriate irregularities in order to ensure the adhesion of the ink and the like. The first sealant layer 12 is often prepared in advance as a film, and its surface is so smooth that when ink or the like is applied to the surface, the adhesion of the ink or the like may be poor. . In particular, when the film used for the first sealant layer 12 is formed by an inflation method, the surface tends to be smoothed easily.

When the adhesion between the first sealant layer 12 and the protective layer 16 is poor as described above, the first base layer 11 is bonded onto the first sealant layer 12, and the first base layer 11 is bonded to the first base layer 11. Appropriate unevenness can be provided to the surface of 11. The arithmetic mean height (Sa) of the surface of the first base layer 11 is preferably 0.1 to 1.0 μm. If it is less than 0.1 μm, there is a risk that the adhesion of the ink will be poor, and if it exceeds 1.0 μm, there is a risk that spots will be formed on the ink and the effect of protecting the surface will be poor. Further, the material of the first base layer 11 is preferably low-density polyethylene from the viewpoint of cost and workability.
Note that when flexographic printing was performed on an LLDPE film having an arithmetic mean height (Sa) of 0.08 μm, ink adhesion was poor and printing peeled off in part of the pattern.

Moreover, the first sealant layer 12 and the second base material layer 13 are joined by dry lamination, and the first base material layer 11 is formed on the surface of the first sealant layer 12 by extrusion lamination. Further, the second base layer 13 and the second sealant layer 15 are bonded together by dry lamination.

In this specification, "outer surface" and "inner surface" refer to the "outer surface" and "inner surface" when the tube container 30 is produced using the laminate 10 of the cylindrical body of the tube container. In addition, "upper side" and "lower side" refer to the mouth side when the tube container 30 is turned upward with the mouth part 36 and cap 37 facing upward, and "lower side" means the opposite side of the mouth part. means side.

Next, the materials of each part constituting the laminate 10 of the cylindrical body of the tube container will be explained.

The first base layer 11, the first sealant layer 12, and the second sealant layer 15 may contain polyethylene (PE), for example. Specifically, the first base layer 11, the first sealant layer 12, and the second sealant layer 15 may be made of the following materials.

The first base layer 11, the first sealant layer 12, and the second sealant layer 15 may be made of any material that can be melted by heat and fused to each other, such as low-density polyethylene (LDPE), medium-density polyethylene ( MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene - Polyolefin resins such as acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene are mixed with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid , acid-modified polyolefin resins modified with unsaturated carboxylic acids such as itaconic acid and others, polyvinyl acetate resins, polyester resins, polystyrene resins, and other resins. be able to.

Further, as the second base layer 13, a polyethylene terephthalate (hereinafter abbreviated as PET) layer can be used, and by printing on the PET layer 13, an inner surface printing portion 13A made of printing ink is provided on the PET layer 13. be able to. Moreover, the second base material layer 13 is responsible for maintaining the rigidity of the tube container.

Furthermore, instead of using a PET layer as the second base layer 13, a nylon layer may be used, or a PET layer having gas barrier properties and having a metal vapor-deposited film on at least one surface may be used. A nylon layer having a metal vapor deposited film on one surface and having gas barrier properties may be used.

Furthermore, a PET layer having a silica vapor deposited film on at least one surface and having gas barrier properties may be used, or a nylon layer having a silica vapor deposited film on at least one surface and having gas barrier properties may be used. .

Further, a PET layer having gas barrier properties and having an aluminum oxide vapor deposited film on at least one surface may be used, or a nylon layer having an aluminum oxide vapor deposited film and gas barrier properties on at least one surface may be used. Good too.

When a nylon layer is used, the mechanical strength is often superior to that of a PET layer.
Furthermore, films equipped with various vapor-deposited films have better gas barrier properties than the films that serve as the base material.

Next, the protective layer 16 provided on the outer surface of the first base layer 11 having heat-sealability and the inner surface printed portion 13A provided on the inner surface of the second base layer 13 will be described.

As shown in FIG. 7, the protective layer 16 is provided in an area other than the pair of bonded ends 33A and 33B of the laminate 10 of the cylindrical body of the tube container. The reason why the protective layer 16 is provided in areas other than the pair of bonded ends 33A and 33B is that when the tube container 30 is manufactured, the pair of bonded ends 33A and 33B are formed so that their outer and inner surfaces overlap each other. This is because it becomes the part to be joined.

Therefore, the protective layer 16 is not provided on the pair of bonded end portions 33A and 33B of the laminate 10 of the cylindrical body of the tube container.
However, if the protective layer 16 has a property that does not inhibit the formation of body bonding or is not destroyed during heat sealing, the protective layer 16 may be applied to one or both of the pair of bonded ends 33A, 33B. may be provided.
If necessary, the protective layer 16 may be partially removed or formed in areas other than the pair of bonded end portions 33A and 33B.

On the other hand, since the inner surface printing portion 13A provided on the inner surface of the second base layer 13 is printed on the second base layer 13 which is smooth and has excellent transparency, it is possible to print with excellent cosmetic properties. is possible.

In addition, in FIG. 7, the original fabric 10A of the stacked body of the cylindrical bodies of a plurality of continuous tube containers is shown before being cut along the cutting line L.

Next, a method for manufacturing the laminate 10 of the cylindrical body of a tube container will be explained with reference to FIG.

First, printing is performed on the inner surface of the second base material layer 13, and in this way, the inner surface printing portion 13A made of printing ink is provided on the inner surface of the second base material layer 13.

Next, the second sealant layer 15 is bonded to the inner surface of the second base layer 13 by dry lamination (DL).

Next, the first sealant layer 12 is bonded to the outer surface of the second base layer 13 by dry lamination.

Next, the first base layer 11 is formed on the outer surface of the first sealant layer 12 by extrusion lamination.

Next, the protective layer 16 is printed on the outer surface of the first base layer 11, and in this way, the printed protective layer 16 is provided on the outer surface of the first base layer 11.
In the manner described above, the laminate 10 of the cylindrical body of the tube container is obtained.

The thus obtained laminate 10 of the cylindrical body of the tube container is wound into a cylindrical shape, and as described above, both ends 33A and 33B are overlapped, and the end portions 33A and 33B of the tube container are rolled up into a cylindrical shape. The outer surface and the inner surface of the laminate 10 of the shaped body are heat-sealed to form the body sticking part 32, and the cylindrical body 31 is produced.
In this case, the first base material layer 11 and the first sealant layer 12 provided on the outer surface side of the laminate 10 of the cylindrical body of the tube container, and the second sealant layer 15 provided on the inner surface side are melted. The cylindrical body portion 31 is obtained by joining.

In addition, although the trunk|drum sticking part 32 is formed by overlapping in the above, each end surface of both end parts 33A and 33B may be butted and joined. Furthermore, the joining line that was joined and joined as described above may be protected by attaching a film to the inner or outer surface of the cylindrical body portion 31.
Further, the inner end portion 33B may be processed to protect the end surface. For example, it may be protected by pasting tape, or the end portion 33B may be bent toward the outside of the container (hemming process).

Next, the open part (upper side) 34A of the cylindrical body part 31 is inserted into a mold (not shown), and the cylindrical body part 31 is formed by compression molding, injection molding, etc. A shoulder portion 35 and a mouth portion 36 are formed in the open portion (upper side) 34A of the shaped body portion 31 to obtain the tube container 30 (see FIGS. 4 and 5).

Next, a cap 37 is attached to the mouth portion 36 of the tube container 30 manufactured as described above, and a plurality of tube containers 30 with the cap 37 attached are stored together in a cardboard box. Thereafter, the plurality of tube containers 30 with the caps 37 attached are transported together with the cardboard box.

As described above, according to the first embodiment of the present invention, the protective layer 16 is provided in an area other than the pair of bonded ends 33A and 33B, and the protective layer 16 has excellent scratch resistance. A tube container 30 with excellent scratch resistance can be manufactured.

<Second embodiment of the present invention>
Next, a second embodiment of the present invention will be described with reference to FIG.

In the second embodiment shown in FIG. 2, a gas barrier layer 14 is bonded to the second base layer 13 of the laminate 10 of the cylindrical body of the tube container by dry lamination, and a second sealant layer 15 is attached to the gas barrier layer 14. are joined by dry lamination.
In the second embodiment shown in FIG. 2, the configuration other than the above is the same as the first embodiment shown in FIGS. 1 and 4 to 6, and the same parts as in the first embodiment are given the same reference numerals. Therefore, detailed explanation will be omitted.

In the second embodiment, the laminate 10 of the cylindrical body of the tube container further includes a gas barrier layer 14 disposed between the second base layer 13 and the second sealant layer 15, and this gas barrier layer 14 As the material, a metal foil, a film having a base film and a vapor-deposited film deposited on the base film, a film whose material itself has gas barrier properties, etc. can be used.

Specifically, the metal foil used as the gas barrier layer 14 includes, for example, aluminum foil. Aluminum foil is a material with excellent gas barrier performance, light blocking properties, and excellent cost performance.

In addition, the base film on which the vapor deposited film is provided includes polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene. Copolymers (ABS resins), polyvinyl chloride resins, fluorine resins, poly(meth)acrylic resins, polycarbonate resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate, various types of nylon, etc. Polyamide resin, polyimide resin, polyamideimide resin, polyallyl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, polyurethane resin, acetal resin, cellulose resin, Films or sheets of various other resins can also be used.

In addition, in the present invention, it is particularly preferable to use PET as the base film on which the vapor deposited film is provided, since it has a good balance between performance and cost.
Further, in the present invention, it is preferable to use nylon as the base film on which the vapor deposited film is provided, especially in situations where mechanical strength is required.

Moreover, a silica vapor-deposited film can be used as the vapor-deposited film deposited on the base film, and a silica-deposited PET containing a base film and a silica-deposited film can be used as the gas barrier layer 14.

Moreover, an aluminum vapor-deposited film can be used as the vapor-deposited film deposited on the base film, and aluminum-deposited PET containing the base film and the aluminum vapor-deposited film can be used as the gas barrier layer 14.

Further, as the vapor deposited film deposited on the base film, an aluminum oxide (alumina) vapor deposited film can be used, and an alumina PET containing the base film and an aluminum oxide (alumina) vapor deposited film is used as the gas barrier layer 14. be able to.

Examples of films that have gas barrier properties themselves include ethylene-vinyl alcohol copolymer resin (EVOH), nylon MXD6, polyacrylonitrile (PAN), and polyvinylidene chloride (PVDC), and these films are used as the gas barrier layer 14. be able to.

In addition, in the first and second embodiments, an example was shown in which the first sealant layer 12 was provided between the first base layer 11 and the second base layer 13, but the first base layer If the sealant layer 11 has a sufficient heat sealing function, it is not necessary to provide the first sealant layer 12.
Other components not described are the same as those in the first embodiment.

In the second embodiment, the second base layer 13 with printing and the gas barrier layer 14 were made separately, but if the gas barrier layer 14 is suitable for printing, the gas barrier layer 14 may be printed. The second base material layer 13 may be reduced. In such a case, it is possible to reduce costs by eliminating the second base material layer 13.

The printability described above will be explained. When reverse printing is performed on the inner surface of the gas barrier layer 14, transparency of the gas barrier layer 14 is required. Further, in the printing process, since tension is applied to the gas barrier layer 14, it is required to have a predetermined strength and little elongation.

On the contrary, the merits of making the printed second base layer 13 and the gas barrier layer 14 separate will be explained. In applications that require particularly high gas barrier properties, it is preferable not to print the gas barrier layer 14 because there is a risk that the deposited layer will be damaged in the printing process. Therefore, it is desirable to separate the second base material layer 13 and the gas barrier layer 14.

<Third embodiment of the claimed invention>
Next, a third embodiment of the present invention will be described with reference to FIG.
In order to improve the design, a design improvement layer 17 made of milky white polyethylene is provided on the inner surface of the printed second base layer 13. The design enhancement layer 17 may be bonded to the second base layer 13 in direct contact with the second base layer 13, or may be bonded to the second base layer 13 via a light-transmissive layer (not shown). They may be joined.

Further, in order to improve the bonding strength between the gas barrier layer 14 and each layer that contacts the front and back surfaces of the gas barrier layer 14, adhesive layers 18A and 18B are provided on the front and back surfaces of the gas barrier layer 14. In particular, when aluminum foil is used for the gas barrier layer 14, it is desirable to provide an adhesive layer in order to improve the bonding strength at the bonding interface of the aluminum foil.

The layer ensuring gas barrier properties may be appropriately selected depending on the performance required for the tube container, cost, etc., with examples of the various films described above.
Other components not described are the same as those in the first embodiment and the second embodiment.

Next, specific embodiments of the present invention will be described.

(Example 1)
Example 1 corresponds to the first embodiment described above.
A laminate 10 having the following layer structure was prepared as the laminate 10 of the cylindrical body of a tube container.

Varnish coating layer 16 / LDPE layer 11 (20 μm) / LLDPE layer 12 (100 μm) / PET layer 13 (12 μm) / inner surface printing part 13A / LLDPE layer 15 (210 μm)

Here, the varnish coating layer 16 is applied to the surface of the LDPE layer 11 by flexographic printing. The LDPE layer 11 is made of low density polyethylene and constitutes the first base layer 11 . Further, the LLDPE layer 12 is made of linear low density polyethylene and constitutes the first sealant layer 12 . Further, the PET layer 13 is made of polyethylene terephthalate (PET) and constitutes the second base material layer 13 . Further, the LLDPE layer 15 is made of linear low density polyethylene and constitutes the second sealant layer 15.
Note that the varnish coating layer 16 can also be applied by gravure printing, a coater, or the like.

A method for manufacturing the laminate 10 of Example 1 will be described.

In manufacturing the laminate 10, first, back printing is performed using a gravure printing machine on the inner surface of the PET film (12 μm), which will become the PET layer 13, so that it has a regular pattern when viewed from the outer surface of the PET film. Printed.

Next, the LLDPE film 12 (100 μm) that will become the first sealant layer 12 is placed on the outer surface of the PET film that will become the PET layer 13 printed in the above procedure, and the LLDPE film 15 (210 μm) that will become the second sealant layer 15 is placed on the inner surface. ) was dry laminated using a dry laminating machine.

Next, an extruder is used to extrude melted LDPE into a film on the outer surface of the LLDPE layer 12 on the outer surface side of the laminate laminated in the above procedure, and the LDPE layer that becomes the first base layer 11 is formed. 11 (20 μm) was formed. Since the surface of the cooling roll that cools and solidifies the molten film-like LDPE layer 11 has an appropriate uneven shape, the surface of the LDPE layer 11 has an uneven shape suitable for printing.

Next, a varnish coating layer 16 was formed by applying ink to the outer surface of the LDPE layer 11 on the outer surface side of the laminate laminated in the above procedure using a flexo printing machine. The ink is an ultraviolet irradiation-curable varnish (OP varnish) Composition: 75-85% by mass of photosensitive monomer, 15-25% by mass of photoinitiator, 1-10% by mass of auxiliary agent, 2,6-di-t-butyl-4- When the laminate including the protective layer 16 made of ultraviolet radiation curing type varnish passes through the ultraviolet irradiation section provided on the discharge side of the flexographic printing machine, the varnish is When cured, the surface hardness of the protective layer 16 increases, the scratch resistance improves, and the coefficient of friction further decreases.

In order to improve printability and ink adhesion in each of the above printing processes, and to improve lamination strength in each lamination process, the surface of each layer is subjected to surface treatments such as corona treatment, etc. An anchor coating agent may be applied as appropriate.

Regarding the tube container 30 in Example 1, the bonding strength between the inside of the pair of bonded ends 33A and the outside of 33B, and the bonding strength between the laminate 10 of the cylindrical body of the tube and the shoulder 35 were measured. . Both of the above two bonding strengths had sufficient strength and were at a level that would pose no problem as a tube container.

(Example 2)
Example 2 corresponds to the second embodiment described above.
A laminate having the following layer structure was prepared as the laminate 10 of the cylindrical body of a tube container.

Varnish coating layer 16 / LDPE layer 11 (20 μm) / LLDPE layer 12 (100 μm) / PET layer 13 (12 μm) / Inner printed portion 13A / (evaporation surface) VM-PET layer 14 (12 μm) / LLDPE layer 15 (210 μm) .

Here, the varnish coating layer 16 is applied to the surface of the LDPE layer 11 by flexographic printing. The LDPE layer 11 is made of low density polyethylene and constitutes the first base layer 11 . Further, the LLDPE layer 12 is made of linear low density polyethylene and constitutes the first sealant layer 12 . Further, the PET layer 13 is made of polyethylene terephthalate (PET) and constitutes the second base material layer 13 . An inner surface printed portion 13A is formed on the inner side of the second base layer 13 by gravure printing. Further, the VM-PET layer 14 is made of an aluminum vapor-deposited polyethylene terephthalate layer, and constitutes the gas barrier layer 14. Note that the evaporation surface of the VM-PET layer 14 is on the outside. By setting the vapor deposition surface on the outside, the attack on the vapor deposition surface by the contents may be alleviated, and the deterioration of the vapor deposited film may be reduced, compared to when the vapor deposition surface is on the inside. Further, the LLDPE layer 15 is made of linear low density polyethylene and constitutes the second sealant layer 15.

A method for manufacturing the laminate 10 of Example 2 will be described.
In manufacturing the laminate 10, first, back printing is performed using a gravure printing machine on the inner surface of the PET film (12 μm), which will become the PET layer 13, so that it has a regular pattern when viewed from the outer surface of the PET film. Printed.

Next, a VM-PET layer 14 (12 μm), which will become the gas barrier layer 14, is sequentially applied to the inner surface of the PET film printed in the above procedure, and an LLDPE film 15, which will become the second sealant layer 15, is further applied to the inner surface of the gas barrier layer 14. (210 μm) was dry laminated (DL) using a dry laminating machine. The deposition surface of the VM-PET layer 14 is the outer side.

Next, an LLDPE film 12 (100 μm), which will become the first sealant layer 12, is dry-laminated on the outer surface of the PET film, which will become the PET layer 13 of the laminate laminated in the above procedure, using a dry laminating machine.

Next, an extruder is used to extrude melted LDPE into a film on the outer surface of the LLDPE film 12 on the outer surface side of the laminate laminated in the above procedure, and an LDPE layer that becomes the first base layer 11 is formed. 11 (20 μm). Since the surface of the cooling roll that cools and solidifies the molten film-like LDPE layer 11 has an appropriate uneven shape, the surface of the LDPE layer 11 has an uneven shape suitable for printing.

Next, ink is applied to the outer surface of the LDPE film 11 on the outer surface side of the laminate laminated in the above procedure using a flexo printing machine to form a varnish coating layer 16. The ink used was an ultraviolet ray curable varnish (same as in Example 1), and the laminate provided with the protective layer 16 of the ultraviolet ray curable varnish was used to cover the ultraviolet irradiation section provided on the discharge side of the flexo printing machine. When passing through, the varnish hardens, increasing the hardness of the surface of the protective layer 16, improving scratch resistance, and further reducing the coefficient of friction.

Regarding the tube container 30 in Example 2, the bonding strength between the inner side of the pair of bonded ends 33A and the outer side of 33B, and the bonding strength between the laminate 10 and the shoulder portion 35 of the cylindrical body of the tube were determined. It was measured. Both of the above two bonding strengths had sufficient strength and were at a level that would pose no problem as a tube container.

(Example 3)
Example 3 corresponds to the third embodiment described above.
A laminate having the following layer structure was prepared as the laminate 10 of the cylindrical body of a tube container.

Varnish coating layer 16 / LDPE layer 11 (30 μm) / LLDPE 12A (60 μm) / LDPE layer 12B (20 μm) / PET layer 13 (12 μm) / Inner surface printing part 13A (anchor coat) / Milky white LLDPE layer 17 (100 μm) / EMAA Layer 18A (20 μm)/Aluminum foil 14 (10 μm)/EMAA layer 18B (30 μm)/LLDPE 15 (100 μm).

Here, the varnish coating layer 16 is applied to the surface of the LDPE layer 11 by flexographic printing. The LDPE layer 11 is made of low density polyethylene and constitutes the first base layer 11 . Further, the LLDPE layer 12 is made of linear low density polyethylene and constitutes the first sealant layer 12 . Further, the PET layer 13 is made of polyethylene terephthalate (PET) and constitutes the second base material layer 13 . An inner surface printed portion 13A is formed on the inner side of the second base layer 13 by gravure printing. The milky-white LLDPE layer 17 is made of linear low-density polyethylene colored milky-white, and constitutes the design improvement layer 17. The EMAA layer 18A is made of ethylene/methacrylic acid copolymer and constitutes the adhesive layer 18A. Further, the aluminum foil 14 constitutes a gas barrier layer 14. Further, the EMAA layer 18B is made of ethylene/methacrylic acid copolymer and constitutes the adhesive layer 18B. Further, the LLDPE 15 is made of linear low density polyethylene and constitutes the second sealant layer 15.

A method for manufacturing the laminate 10 of Example 3 will be described.

In manufacturing the laminate 10, first, back printing is performed using a gravure printing machine on the inner surface of the PET film (12 μm), which will become the PET layer 13, so that it has a regular pattern when viewed from the outer surface of the PET film. Printed.

Next, a previously prepared film that will become the milky white LLDPE layer 17 is dry laminated with a dry laminating machine on the inner surface of the PET film that will become the PET layer 13 printed in the above procedure.

Next, an extruder is used to extrude the melted EMAA layer 18A into a film on the inner surface of the LLDPE layer 17 of the laminate laminated in the above procedure, so that the EMAA layer 18A, which will become the adhesive layer 18A, is melted. After bonding the aluminum foil 14 that will become the gas barrier layer 14 in this state, the EMAA layer 18A is cooled and solidified and bonded to the aluminum foil 14.

Further, following the above steps, the melted EMAA layer 18B is extruded into a film shape onto the inner surface of the aluminum foil 14, and the LLDPE layer 15 is formed while the EMAA layer 18B, which becomes the adhesive layer 18B, is melted. After bonding the LLDPE films prepared in advance, the EMAA layer 18B is cooled to solidify and adhere to the LLDPE layer 15. Note that EMAA has stronger adhesion to metal than LDPE, and is effective in improving the lamination strength of aluminum foil.

Next, the outer surface of the PET film of the laminate laminated in the above procedure is coated with a polyurethane anchor coating agent, and then the molten LDPE layer 12B is extruded into a film using an extruder to form an adhesive layer. While the LDPE layer 12B, which will become the LLDPE layer 12B, is melted, a previously prepared film, which will become the LLDPE layer 12A, is bonded to the outer surface of the LDPE layer 12B. Thereafter, the LDPE layer 12B is cooled to solidify and adhere to the LLDPE layer 12A.

Further, following the above steps, the molten LDPE layer 11 is extruded into a film shape on the outer surface of the LLDPE layer 12A, and then cooled to form the LDPE layer 11 (20 μm) which becomes the first base layer 11. Form. Since the surface of the cooling roll that cools and solidifies the molten film-like LDPE layer 11 has an appropriate uneven shape, the surface of the LDPE layer 11 has an uneven shape suitable for printing.

Next, a varnish coating layer 16 is formed by applying ink to the outer surface of the LDPE layer 11 on the outer surface side of the laminate laminated in the above procedure using a flexo printing machine. The ink used was an ultraviolet ray curable varnish (same as in Example 1), and the laminate provided with the protective layer 16 of the ultraviolet ray curable varnish was used to cover the ultraviolet irradiation section provided on the discharge side of the flexo printing machine. When passing through, the varnish hardens, increasing the hardness of the surface of the protective layer 16, improving scratch resistance, and further reducing the coefficient of friction.

Regarding the tube container 30 in Example 3, the bonding strength between the inner side of the pair of bonded ends 33A and the outer side of 33B, and the bonding strength between the laminate 10 and the shoulder portion 35 of the cylindrical body of the tube were determined. It was measured. Both of the above two bonding strengths had sufficient strength and were at a level that would pose no problem as a tube container.

(Comparative example)
The comparative example is a tube container manufactured using the same configuration and manufacturing method as Example 3, except that it does not have the protective layer 16 consisting of the varnish coating layer 16.

(Comparison and evaluation of various examples and comparative examples)
A friction coefficient measurement test, a friction test (scratch resistance test), and a transportation test were conducted on samples of various examples and samples of comparative examples.

(Surface friction coefficient measurement)
The friction coefficients of the surfaces of various Examples and Comparative Examples were measured. The results are shown in Table 1.
The measuring device used was TR-2 manufactured by Toyo Seiki Seisakusho Co., Ltd., and the static friction coefficient and dynamic friction coefficient were measured in accordance with JIS K-7125. The number of tests was n=3, and the test speed was 100 mm/min.

The measurement results are shown in Table 1.
The friction coefficient of the surface of the laminate of the cylindrical body of the tube container described in the item of surface subject to friction in Table 1 is measured using the same combination of materials, and the friction coefficient between the tubes when transporting the tube container is measured. Expect some friction.
The metal surface described in the item of surface subject to friction is assumed to come into contact with metal parts during the transportation process during filling and packaging of tube containers. The metal surface used for friction measurements this time was stainless steel, and has the properties of a mirror with a flat, smooth surface.

From Table 1, the following can be seen.
When the friction target surface is the surface of the laminate of the cylindrical body of the tube container, both the static friction coefficient and the kinetic friction coefficient are smaller in the various examples than in the comparative example. Since the frictional force generated on the surface is small, there is less damage to the surface. This makes the various embodiments less likely to cause scratches on the surface during transportation of the tube container.

When the surface to be rubbed is a metal surface, both the static friction coefficient and the kinetic friction coefficient are smaller in the various examples than in the comparative example, and the frictional force generated on the tube container surface is smaller in the various examples. , less damage to the surface. As a result, the various embodiments are less likely to cause scratches on the surface when they come into contact with metal parts during the transport process during filling and packaging of tube containers.

In addition, in a type of conveyor chain that has a plate on the top, the cap of a tube container is placed on the plate with the top surface facing downward, and the tube container is transported only by the frictional force between the top surface of the cap and the conveyor plate. The cylindrical body of the container may be conveyed while being regulated by a metal guide attached to the conveyor. In a tube container whose cylindrical body has a small coefficient of friction, the frictional force exerted by the guide on the cylindrical body of the tube container is small, which reduces the chance of the tube container getting caught or falling over on the line, resulting in a reduction in production. Less inhibition.

(Evaluation of surface scratch resistance)
The scratch resistance of the surface was evaluated using a Gakushin friction test (JIS L-0849). The measuring device was FR-2 manufactured by Suga Test Instruments Co., Ltd.

When performing the friction test between the laminated bodies, the laminated body of the cylindrical body of a rectangular tube container (width 30 mm) is fixed on the lower test piece stand, and a layer made of the same material is attached to the upper friction element. The laminate of the cylindrical body of the tube container was formed into a strip (width 30 mm) and attached.
When performing a friction test between the laminate and a metal plate, a metal plate was attached to the upper friction element and the friction element was slid. The metal plate used in the Gakushin-style friction test this time is stainless steel, and has a smooth mirror-like surface.
Further, a weight of 200 g was used.

The above Gakushin friction test was repeated 100 and 300 times, and the number of scratches produced on the surface of the laminate was visually counted. If the number of scratches per sample is 20 or more, the test result will be marked as × (poor), and if the number of scratches is 10 or more but less than 20, the result will be marked as △ (slightly poor). If there were less than 10 lines, the test result was rated ○ (good).

As with the friction coefficient measurement, the surface of the laminate of the cylindrical body of the tube container described in the item of friction target surface is the same combination of materials for the friction coefficient measurement, and the surface of the laminate of the tube container's cylindrical body described in the item of surface to be rubbed is measured for the friction coefficient. It is assumed that the tubes will rub against each other during the test.
The metal surface of the surface subject to friction is assumed to come into contact with metal parts such as guide parts during the transportation process during filling and packaging of tube containers.

From Table 2, the following can be seen.
In the friction test between the surfaces of the laminated body of the cylindrical body of the tube container, in the comparative example, the results were △ (slightly poor) after 100 frictions, and × (poor) after 300 frictions. In addition, in various examples, the results were ○ (good) when the number of frictions was 100 times, and ○ (good) when the number of frictions was 300 times.
From this, it can be seen that the various Examples are less likely to be scratched when the tube containers rub against each other, and have improved scratch resistance than the Comparative Examples.

In addition, in the friction test between the surface of the laminate of the cylindrical body of the tube container and the metal surface, in the comparative example, the results were ○ (good) when the number of frictions was 100 times, and △ (slightly poor) when the number of frictions was 300 times. Further, in Example 3, the result was ○ (good) when the number of frictions was 100 times, and ○ (good) when the number of frictions was 300 times.
From this, it can be seen that the various examples are less likely to be scratched when the surface of the tube container rubs against the metal parts, and the scratch resistance is improved compared to the comparative example.

(Evaluation of scratch resistance through actual transportation test)
The samples of Example 3 and Comparative Example were subjected to an actual transportation test. The prepared samples were filled with water and made into packaged products, packed in 10 cardboard boxes each, and transported round trip between Shinjuku Ward, Tokyo and Kyotanabe City, Kyoto Prefecture using courier service (land route). did. It was about 475km one way and about 950km round trip.

Upon arrival, the cardboard box was unpacked and the tube container was visually observed. The number of scratches produced on the surface of the cylindrical body of the tube container was counted. If the number of scratches per tube container is 20 or more, the test result will be marked as × (poor), and if the number of scratches is 10 or more but less than 20, the result will be marked as △ (slightly poor). If the number of the samples was less than 10, the test result was rated as ○ (good).

The results are shown in Table 3.
The damage to each of the 10 tube containers was similar and there was no difference.

The following can be seen from Table 3.
The sample of the comparative example had many scratches and had a poor appearance. The sample of Example 3 had less than 10 scratches, which was good.
From this, in the actual transportation test, it was found that the tube container of Example 3 had excellent scratch resistance and was able to maintain its cosmetic appearance.

According to the present invention, it is possible to provide a tube container in which the surface of the laminate of the cylindrical body of the tube container has a low coefficient of friction. It is possible to prevent tube containers from falling over and overturning, and the filling and packaging line for tube container packaging products can operate stably, contributing to quality improvement and production cost reduction. Furthermore, since the outer surface of the tube container is not easily damaged, it is possible to display products with cosmetic properties at stores, thereby stimulating the desire to purchase them.

10 Laminated body of the cylindrical body of the tube container 10A Original fabric of the laminate of the cylindrical body of the tube container 11 First base layer 12 First sealant layer 12A Part of the first sealant layer 12B First sealant Some layers of layers (also adhesive layer)
13 Second base material layer 13A Inner surface printing part 14 Gas barrier layer 15 Second sealant layer 16 Protective layer 17 Design enhancement layer 18A Adhesive layer 18B Adhesive layer 30 Tube container 30A Tube container packaging product 31 Cylindrical body part 32 Body pasting part 33A Bonded end 33B that becomes the outside when attaching the body 34A Bonded end that becomes the inside when attaching the body Opening (upper side)
34B opening (lower side)
35 Shoulder part 36 Mouth part 37 Cap 38 Contents 39 Bottom seal part

L cutting line

Claims (6)

In a tube container consisting of a body having a pair of bonded ends and a shoulder,
The laminate of the body has at least a first base material layer, a first sealant layer, a second base material layer, and a second sealant layer laminated in this order from the outer surface to the inner surface,
The first base material layer is low density polyethylene, the first sealant layer is linear low density polyethylene,
The first base layer and the first sealant layer are adjacent to each other,
The thickness of the first base layer is thinner than the thickness of the first sealant layer,
A protective layer is provided on the entire or at least part of the outer surface of the first base layer,
The coefficient of static friction between the protective layers is 0.09 or more and 0.13 or less ,
A tube container characterized in that the coefficient of dynamic friction between the protective layers is 0.07 or more and 0.11 or less . The tube container according to claim 1, wherein the arithmetic mean height (Sa) of the surface of the first base layer is 0.1 to 1.0 μm . The protective layer is a printing ink containing an ultraviolet ray curable varnish,
The printing ink has a composition of 75 to 85% by weight of photosensitive monomer, 15 to 25% by weight of photopolymerization initiator, 1 to 10% by weight of auxiliary agent, and 1% by weight of 2,6-di-t-butyl-4-methylphenol. The tube container according to claim 1 or 2, characterized in that it contains less than %. Claim: 1. The protective layer is not formed on the pair of bonded ends of the body, and there are regions other than the pair of bonded edges in which the protective layer is not formed. 4. The tube container according to any one of 1 to 3 . The second base layer is polyethylene terephthalate with a vapor deposited film,
The tube container according to any one of claims 1 to 4 , characterized in that it is printed. The second base material layer is nylon with a vapor deposited film,
The tube container according to any one of claims 1 to 4 , characterized in that it is printed.

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