JP2022088148A - Packaging material for tube container, tube container and tube container with cap - Google Patents

Abstract

To provide a packaging material for a tube container, the tube container and the tube container with cap capable of having sufficient joint strength at a joint.SOLUTION: A packaging material 50 for a tube container includes a first sealant layer 51, an adhesive layer 54a, a base material layer 52, and a second sealant layer 53 in which arranged in order from an outer surface 501 toward an inner surface 502. The first sealant layer 51 has a first resin layer 51a having a heat-sealing property, and a second resin layer 51b arranged between the first resin layer 51a and an adhesive layer 54a. The first resin layer 51a is an extruded resin layer extruded onto the second resin layer 51b. The first resin layer 51a contains linear low-density polyethylene.SELECTED DRAWING: Figure 2A

Description

The present disclosure relates to packaging materials for tube containers, tube containers and tube containers with caps.

Conventionally, as a laminate constituting the body tube of a tube container, an outer surface printing base material layer, an outer surface sealant layer, an inner surface printing base material layer, and an inner surface sealant having heat-sealing properties, which are arranged in order from the outer surface to the inner surface, are used. A laminate having a layer (packaging material for a tube container) is known (for example, Patent Document 1).

Of these, in the step of forming the body tube (cylindrical body) made of the laminated body, the laminated body is rolled to form an outer surface printing base material layer and an outer surface sealant layer provided on the outer surface side of the laminated body. , The inner surface sealant layer provided on the inner surface side is overlapped, and the overlapped portion is welded to form a welded portion (joint portion) to manufacture a body tube.

By the way, the tube container is required to have sufficient joint strength at the joint portion.

Japanese Unexamined Patent Publication No. 2019-189238

The present disclosure has been made in consideration of such a point, and provides a packaging material for a tube container, a tube container, and a tube container with a cap, which can have sufficient joint strength at the joint portion. The purpose.

The packaging material for a tube container according to one embodiment includes a first sealant layer, an adhesive layer, a base material layer, and a second sealant layer arranged in order from the outer surface to the inner surface, and the first sealant layer. Has a first resin layer having a heat-sealing property and a second resin layer arranged between the first resin layer and the adhesive layer, and the first resin layer is the second resin layer. It is an extruded resin layer extruded upward, and the first resin layer is a packaging material for a tube container containing linear low-density polyethylene.

In the packaging material for tube containers according to one embodiment, the second sealant layer may contain linear low-density polyethylene.

In the packaging material for tube containers according to one embodiment, the adhesive layer may contain linear low-density polyethylene or low-density polyethylene.

In the packaging material for tube containers according to one embodiment, the second resin layer and the adhesive layer may each contain linear low-density polyethylene.

In the packaging material for tube containers according to one embodiment, the second resin layer may contain low density polyethylene, and the adhesive layer may contain linear low density polyethylene.

In the packaging material for tube containers according to one embodiment, the linear low-density polyethylene may contain a biomass-derived component.

The packaging material for a tube container according to an embodiment may further include a first barrier layer arranged between the base material layer and the adhesive layer.

The packaging material for a tube container according to an embodiment may further include a second barrier layer arranged between the base material layer and the second sealant layer.

In the packaging material for a tube container according to one embodiment, the first printing layer located on the outer surface side of the first resin layer, the base material layer and the adhesive layer, or the base material layer and the above. A second printed layer located between the second sealant layer may be further provided.

The tube container according to one embodiment is joined to a body tube having a joint portion in which opposite ends of the tube container packaging material according to one embodiment are overlapped and joined to each other, and one end of the body tube. It is a tube container provided with a head member.

The tube container according to one embodiment is joined to a body tube having a joint portion in which opposite ends of the tube container packaging material according to one embodiment are overlapped and joined to each other, and one end of the body tube. The first print layer is provided in a region other than the joint portion, and the second print layer is provided in a region including the joint portion, which is a tube container.

In the tube container according to the embodiment, in the body tube, the pattern formed on the first print layer and the pattern formed on the second print layer may be continuous with each other.

The capped tube container according to one embodiment is a capped tube container including the tube container according to one embodiment and a cap attached to the head member.

According to the present disclosure, it is possible to have sufficient adhesive strength at the joint portion of the tube container.

FIG. 1 is a partial vertical cross-sectional view showing a capped tube container according to the present embodiment filled with contents. FIG. 2A is a cross-sectional view showing an example of the layer structure of the laminated body according to the present embodiment. FIG. 2B is a cross-sectional view showing an example of the layer structure of the laminated body according to the present embodiment. FIG. 2C is a cross-sectional view showing an example of the layer structure of the laminated body according to the present embodiment. FIG. 3 is a horizontal sectional view (a sectional view taken along line III-III of FIG. 1) showing a joint portion of the body tube of the tube container according to the present embodiment. FIG. 4 is a plan view showing a laminated body according to the present embodiment. FIG. 5 is a perspective view showing a body tube of a tube container according to the present embodiment. FIG. 6 is a horizontal sectional view (VI-VI line sectional view of FIG. 1) showing a joint portion of the body tube of the tube container according to the present embodiment. FIG. 7 is a schematic view showing a method for manufacturing a tube container according to the present embodiment. FIG. 8 is a partial vertical sectional view showing a method of manufacturing a tube container with a cap according to the present embodiment. FIG. 9 is a horizontal cross-sectional view showing a joint portion of the comparative example in the example.

Hereinafter, one embodiment will be described with reference to the drawings. 1 to 8 are diagrams showing one embodiment. Each figure shown below is schematically shown. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. In addition, it is possible to change and implement as appropriate within the range that does not deviate from the technical idea. In each of the figures shown below, the same parts are designated by the same reference numerals, and some detailed description may be omitted. Further, the numerical values and material names such as the dimensions of each member described in the present specification are examples of the embodiment, and the present invention is not limited to these, and can be appropriately selected and used. In the present specification, terms that specify a shape or a geometric condition, such as parallel, orthogonal, and vertical, are used to include substantially the same state in addition to the exact meaning.

First, with reference to FIG. 1, a tube container 10A with a cap manufactured by using the laminate (packing material for a tube container) 50 according to the present embodiment will be described.

As shown in FIG. 1, the tube container 10A with a cap according to the present embodiment includes a tube container 10 and a cap 20 attached to a head member 40 described later of the tube container 10.

Of these, the tube container 10 includes a body tube 30 which is a laminated molded tube, and a head member 40 joined to one end 31 of the body tube 30.

Here, first, the head member 40 of the tube container 10 will be described.

As shown in FIG. 1, the head member 40 has a shoulder portion 41 and a mouth portion 42. Of these, the cap 20 is attached to the mouth portion 42.

Such a head member 40 is molded by, for example, a compression molding method, as will be described later. Further, the head member 40 is made of a resin material such as high density polyethylene (HDPE).

Next, the body tube 30 of the tube container 10 will be described. The body tube 30 shown in FIG. 1 has a substantially cylindrical shape as a whole. The body tube 30 is composed of a laminated body 50 (see FIGS. 2A to 2C) that has been laminated and molded. Further, the body tube 30 has a body seal portion (joint portion) 32 in which opposite end portions 35 (see FIG. 4) of the laminated body 50 are overlapped and joined to each other. The body seal portion 32 is formed along the longitudinal direction of the body tube 30. Such a body tube 30 is obtained by rolling the laminated body 50 into a cylindrical shape, superimposing the opposite end portions 35 on each other, and joining them to each other by, for example, heat sealing.

Further, the body tube 30 has a bottom sealing portion 34 in which the laminated bodies 50 are joined to each other. From the opening 50B (see FIG. 5) formed in the other end 33 of the body tube 30, the bottom seal portion 34 is, for example, a cleansing agent containing alcohol, a sunscreen, a toothpaste, a treatment, a body cream, and the like. After filling an appropriate amount of a hair styling agent (so-called hair wax) and other contents C, the laminated bodies 50 in the vicinity of the opening 50B are joined to each other. The length L (see FIG. 5) of such a body tube 30 may be, for example, 80 mm or more and 200 mm or less.

Next, the layer structure of the laminated body 50 will be described. 2A to 2C show an example of the layer structure of the laminated body 50 constituting the body tube 30. As shown in FIGS. 2A to 2C, the laminated body 50 includes a first sealant layer 51, a first adhesive layer (adhesive layer) 54a, and a base material layer 52 arranged in order from the outer surface 501 to the inner surface 502. , A second sealant layer 53 is provided. Of these, the first sealant layer 51 has a first resin layer 51a having a heat-sealing property and a second resin layer 51b arranged between the first resin layer 51a and the first adhesive layer 54a. There is. Further, as shown in FIGS. 2A and 2C, even if the laminated body 50 further includes a first barrier layer 56a arranged between the base material layer 52 and the first adhesive layer (adhesive layer) 54a. good. Further, as shown in FIGS. 2B and 2C, the laminated body 50 may further include a second barrier layer 56b arranged between the base material layer 52 and the second sealant layer 53. Further, as shown in FIGS. 2A to 2C, the laminated body 50 includes a first printing layer 55a located on the outer surface 501 side of the first resin layer 51a, a base material layer 52, and a first adhesive layer (adhesive layer). A second printing layer 55b located between 54a or between the substrate layer 52 and the second sealant layer 53 may be further provided.

Specifically, as shown in FIG. 2A, the laminated body 50 has a first printed layer 55a, a first sealant layer 51, a first adhesive layer 54a, and an anchor coat layer from the outer surface 501 to the inner surface 502. 58, a second printed layer 55b, a barrier layer (first barrier layer) 56a, a base material layer 52, a second adhesive layer 54b, an intermediate layer 57, a third adhesive layer 54c, and a second sealant layer. 53 and are provided in this order. Of these, the first sealant layer 51 has a first resin layer 51a and a second resin layer 51b arranged in order from the outer surface 501 toward the inner surface 502. In the example shown in FIG. 2A, the first printed layer 55a constitutes the outer surface of the body tube 30, and the second sealant layer 53 constitutes the inner surface of the body tube 30. Although not shown, the second printing layer 55b may be provided on the surface of the base material layer 52 on the side of the second adhesive layer 54b.

Further, as shown in FIG. 2B, the laminated body 50 includes a first printed layer 55a, a first sealant layer 51, a first adhesive layer 54a, and an anchor coat layer 58 from the outer surface 501 to the inner surface 502. The base material layer 52, the second printed layer 55b, the second adhesive layer 54b, the barrier layer (second barrier layer) 56b, the intermediate layer 57, the third adhesive layer 54c, and the second sealant layer 53 are provided. It is prepared in this order. Of these, the first sealant layer 51 has a first resin layer 51a and a second resin layer 51b arranged in order from the outer surface 501 toward the inner surface 502. Also in the example shown in FIG. 2B, the first printing layer 55a constitutes the outer surface of the body tube 30, and the second sealant layer 53 constitutes the inner surface of the body tube 30. Although not shown, the second printing layer 55b may be provided on the surface of the base material layer 52 on the side of the anchor coat layer 58.

Further, as shown in FIG. 2C, the laminated body 50 includes a first printed layer 55a, a first sealant layer 51, a first adhesive layer 54a, and an anchor coat layer 58 from the outer surface 501 to the inner surface 502. The second printed layer 55b, the barrier layer (first barrier layer) 56a, the base material layer 52, the second adhesive layer 54b, the barrier layer (second barrier layer) 56b, the intermediate layer 57, and the third adhesive. The layer 54c and the second sealant layer 53 are provided in this order. Of these, the first sealant layer 51 has a first resin layer 51a and a second resin layer 51b arranged in order from the outer surface 501 toward the inner surface 502. Also in the example shown in FIG. 2C, the first printing layer 55a constitutes the outer surface of the body tube 30, and the second sealant layer 53 constitutes the inner surface of the body tube 30. Although not shown, the second printing layer 55b may be provided on the surface of the base material layer 52 on the side of the second adhesive layer 54b.

Hereinafter, each layer of the laminated body 50 will be described.

First Sealant Layer The first sealant layer 51 is a layer for adhering the laminated bodies 50 to each other, and as the material constituting the first sealant layer 51, a material that is melted and fused by heat is used.

(First resin layer of the first sealant layer)
The first resin layer 51a of the first sealant layer 51 is an extruded resin layer extruded onto the second resin layer 51b. The first resin layer 51a contains linear (linear) low density polyethylene (LLDPE). The linear low-density polyethylene is obtained by copolymerizing an α-olefin with a linear polymer obtained by polymerizing ethylene at medium pressure or low pressure to introduce a short chain branch. Examples of α-olefins include 1-butene (C ₄ ), 1-hexene (C ₆ ), 4-methylpentene (C ₆ ), 1-octene (C ₈ ) and the like. The density of the linear low-density polyethylene is, for example, 915 kg / m ³ or more and 945 kg / m ³ or less. Further, the linear low-density polyethylene may contain a biomass-derived component.

Linear low-density polyethylene is superior in tensile strength, tear strength and impact resistance as compared with, for example, low-density polyethylene. In particular, since the linear low-density polyethylene is excellent in impact resistance as compared with, for example, the low-density polyethylene, the first resin layer 51a contains the linear low-density polyethylene, so that the body portion is formed. The impact resistance of the tube 30 can be improved. Further, since the layer containing the linear low-density polyethylene is excellent in low-temperature sealing property, the bonding strength of the body sealing portion 32 can be increased even when the laminated bodies 50 are heat-sealed at a low temperature. Therefore, it is possible to form the body seal portion 32 having high bonding strength under various manufacturing conditions.

In the present embodiment, the thickness of the first resin layer 51a is preferably 10 μm or more and 50 μm or less.

(Second resin layer of the first sealant layer)
For the second resin layer 51b of the first sealant layer 51, for example, a polyolefin film can be used. Since the second resin layer 51b contains polyolefin, when the first sealant layer 51 and the second sealant layer 53 are bonded to each other, the bondability between the first sealant layer 51 and the second sealant layer 53 is improved. Can be improved. Specifically, the second resin layer 51b includes, for example, a low density polyethylene (LDPE) film, a medium density polyethylene (MDPE) film, a high density polyethylene (HDPE) film, and a linear (linear) low density polyethylene (line). LLDPE) film, polypropylene film, acid-modified polyolefin resin film obtained by modifying a polyolefin resin such as polyethylene or polypropylene with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acid. , Polyvinyl acetate resin film, polyester resin film, polystyrene resin film, polyacrylonitrile, saturated polyester, polyvinyl alcohol and other films made of one or more of other resins can be used. When the second resin layer 51b contains polyethylene such as, for example, linear low density polyethylene, the polyethylene may contain a biomass-derived component.

Here, the low-density polyethylene is polyethylene having a density of 910 kg / m ³ or more and 930 kg / m ³ or less. The medium density polyethylene is polyethylene having a density of 930 kg / m ³ or more and 942 kg / m ³ or less. Further, the high-density polyethylene is polyethylene having a density of 942 kg / m ³ or more. Low-density polyethylene can be obtained, for example, by polymerizing ethylene at a high pressure of 1000 atm or more and less than 2000 atm. Medium density polyethylene and high density polyethylene can be obtained, for example, by polymerizing ethylene at medium pressure or low pressure of 1 atm or more and less than 1000 atm.

Further, the second resin layer 51b preferably contains linear low-density polyethylene. Since the second resin layer 51b contains the linear low-density polyethylene, when the first sealant layer 51 and the second sealant layer 53 are joined to each other, the first sealant layer 51 and the second sealant layer 53 are combined. The bondability of the material can be improved more effectively.

The heat-sealable film described above contains, for example, one or more of the above resins as a main component, and a desired additive is arbitrarily added to the resin composition to prepare a resin composition, and then the above-mentioned preparation is performed. The resin composition can be molded by using, for example, a T-die method, an inflation method, or another molding method.

As the material of the second resin layer 51b, for example, an antiblocking agent, a lubricant (fatty acid amide, etc.), a flame retardant, an inorganic or organic filler, or the like may be arbitrarily added.

In the present embodiment, the thickness of the second resin layer 51b is preferably 10 μm or more and 50 μm or less.

Base material layer The base material layer 52 is a layer for supporting the first sealant layer 51 and the second sealant layer 53 and increasing the strength of the entire laminated body 50, for example. Examples of the material constituting the base material layer 52 include a polyester resin, a polyamide resin, a polyaramid resin, a polyolefin resin, a polycarbonate resin, a polyacetal resin, a fluororesin, and a film or sheet of a tough resin. , Others can be used. As an example, the substrate layer 52 may contain polyethylene terephthalate. When the base material layer 52 contains polyethylene terephthalate, the polyethylene terephthalate may contain a biomass-derived component.

Further, as the resin film or sheet described above, any unstretched film, stretched film stretched in the uniaxial direction or biaxial direction, or the like can be used. Above all, in the present embodiment, the biaxially stretched polyester resin film is preferable because it is excellent in terms of printability.

In the present embodiment, the thickness of the base material layer 52 is preferably 10 μm or more and 25 μm or less.

The second sealant layer The second sealant layer 53 is a layer for adhering the laminated bodies 50 to each other, and as a material constituting the second sealant layer 53, for example, the second resin layer 51b of the first sealant layer 51 described above is used. The same material as above can be used.

Further, the second sealant layer 53 preferably contains linear low-density polyethylene. Since the second sealant layer 53 contains the linear low-density polyethylene, when the first sealant layer 51 and the second sealant layer 53 are joined to each other, the first sealant layer 51 and the second sealant layer 53 are combined. The bondability of the material can be improved more effectively. Further, when the second sealant layer 53 contains the linear low-density polyethylene, the linear low-density polyethylene may contain a biomass-derived component.

In the present embodiment, the thickness of the second sealant layer 53 is preferably 50 μm or more and 250 μm or less.

The layers such as the first adhesive layer, the second adhesive layer, the third adhesive layer , the first adhesive layer 54a, the second adhesive layer 54b, and the third adhesive layer 54c are the first sealant layer 51, the base material layer 52, and the intermediate layer 57. This is a layer for adhering the second sealant layer 53 and the like to each other. The material constituting these layers can be appropriately selected depending on the resin constituting the layer to be adhered.

Examples of these layers include an anchor coating agent such as isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organic titanium-based, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, and polyvinyl acetate-based. Cellulous or other laminating adhesives can be used arbitrarily.

The first adhesive layer 54a, the second adhesive layer 54b, and the third adhesive layer 54c include, for example, polyethylene, polypropylene, ethylene-vinyl alcohol, ethylene-methacrylic acid copolymer (EMAA), and ethylene-acrylic acid co-weight. Combined, ionomer, maleic anhydride-modified polyolefin resin and the like can be preferably used.

By the way, when the above-mentioned second sealant layer 53 contains linear low-density polyethylene, the first adhesive layer 54a among the first adhesive layer 54a, the second adhesive layer 54b and the third adhesive layer 54c is straight. It preferably contains chain low density polyethylene or low density polyethylene. In this case, the first adhesive layer 54a and the second sealant layer 53 can be easily melted when they are attached to the cylinder, so that the adhesiveness can be improved. That is, as shown in FIG. 3, in the body sealing portion 32, the first adhesive layer 54a of the laminated body 50b located inside and the second sealant layer 53 of the laminated body 50a located outside (hereinafter, the second sealant). Layer 531) and (also referred to as layer 531) melt and adhere to each other. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side. From the viewpoint of melting and adhering the first adhesive layer 54a and the second sealant layer 531 of the laminated body 50b located inside to each other, the first adhesive layer 54a contains linear low-density polyethylene. It is preferable to have. Further, when the first adhesive layer 54a contains polyethylene such as linear low-density polyethylene, the polyethylene may contain a biomass-derived component.

Here, the relationship between the second resin layer 51b of the first sealant layer 51 and the first adhesive layer 54a will be described.

The second resin layer 51b and the first adhesive layer 54a of the first sealant layer 51 may each contain linear low-density polyethylene. In this case, the second resin layer 51b, the first adhesive layer 54a, and the second sealant layer 53 can be easily melted at the time of cylinder sticking, so that the adhesiveness can be improved. That is, as shown in FIG. 3, in the body seal portion 32, the second resin layer 51b and the first adhesive of the first sealant layer 51 (hereinafter, also referred to as the first sealant layer 512) of the laminated body 50b located inside. The layer 54a and the second sealant layer 531 melt and adhere to each other. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side.

Further, the first adhesive layer 54a may contain linear low-density polyethylene, and the second resin layer 51b may contain low-density polyethylene. Since the first adhesive layer 54a contains the linear low-density polyethylene, as shown in FIG. 3, the first adhesive layer 54a and the second sealant layer 531 of the laminated body 50b located inside are formed. It melts and adheres to each other. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side. Further, since low-density polyethylene can be used for the sealant layer of the laminate constituting the general body tube, the second resin layer 51b contains the low-density polyethylene, so that switching within the process can be performed. It only takes a short time.

In the present embodiment, the thickness of the first adhesive layer 54a, the second adhesive layer 54b, and the third adhesive layer 54c is preferably 3 μm or more and 60 μm or less, respectively.

Further, as a method of laminating the first sealant layer 51, the base material layer 52, the intermediate layer 57, the second sealant layer 53 and the like on each other, for example, a wet lamination method, a dry lamination method, a solvent-free dry lamination method, and an extrusion method are used. It can be carried out by a lamination method, a T-die co-extrusion molding method, a co-extrusion lamination method, an inflation method, or any other method. Further, when performing the above-mentioned laminating, if necessary, the film can be subjected to pretreatment such as corona treatment and ozone treatment.

First print layer and second print layer The print layers such as the first print layer 55a and the second print layer 55b are layers on which a pattern or the like is printed, and are layers for improving the design of the laminate 50. be. The main component of the printing layer is one or more of ordinary ink vehicles, and if necessary, plasticizers, stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, curing agents, cross-linking agents, and lubricants. , Antistatic agent, filler, and other additives 1 or 2 or more are arbitrarily added, and colorants such as dyes and pigments are added, and the ink is sufficiently kneaded with a solvent, a diluent, etc. An ink composition obtained by adjusting the composition can be used. Examples of such an ink vehicle include amani oil, cutting oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin-modified resin, shelac, alkyd resin, phenolic resin, maleic acid resin, natural resin, and carbonized resin. Hydrogen resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, One or more of amino alkyd resins, nitrocellulose, ethyl cellulose, rubber chloride, cyclized rubber, etc. can be used in combination. In addition to gravure printing, the printing method may be letterpress printing, screen printing, transfer printing, flexographic printing, or other printing method.

Here, the first print layer 55a and the second print layer 55b will be described in detail with reference to FIG. As shown in FIG. 4, the first print layer 55a is provided in a region other than the end portion 35 of the laminated body 50. The reason why the first printing layer 55a is provided in the region other than the end portion 35 in this way is that the end portion 35 is a portion where the outer surface 501 and the inner surface 502 of each other are overlapped and joined when the body tube 30 is manufactured. be. As described above, since the first printing layer 55a constituting the outer surface 501 of the laminated body 50 is provided in the region other than the end portion 35, it is possible to prevent the bonding strength of the body portion sealing portion 32 from being lowered. be able to. In FIG. 4, the area where the first print layer 55a is provided is shown as a satin finish.

On the other hand, the second printed layer 55b is provided at the end portion 35 of the laminated body 50.

In this case, as shown in FIG. 5, in the body tube 30 in which the facing ends 35 of the laminated body 50 are overlapped and joined to each other, the first printed layer 55a is other than the body sealing portion (joining portion) 32. The second print layer 55b is provided in the region corresponding to the body seal portion 32. As a result, a pattern that straddles the body seal portion 32 of the body tube 30 can be displayed to the outside. Further, in the body tube 30, the pattern formed on the first print layer 55a and the pattern formed on the second print layer 55b are continuous with each other. In the illustrated example, the first print layer 55a and the second print layer 55b reveal the letters "ABC" outward along the longitudinal direction of the body tube 30. In FIG. 5, the area where the first print layer 55a is provided is shown in satin. Further, in the present specification, the "picture" means a character, a figure, a symbol, a pattern or a color, or a combination thereof.

In the illustrated example, in the laminated body 50, the second print layer 55b is provided at the end portion 35, and in the body tube 30, the second print layer 55b is provided in the region corresponding to the body seal portion 32. However, it is not limited to this. If necessary, the second print layer 55b may be provided over the entire area of the laminate 50, or the second print layer 55b may be provided over the entire body tube 30.

First Barrier Layer and Second Barrier Layer The barrier layers such as the first barrier layer 56a and the second barrier layer 56b are layers for suppressing the permeation of oxygen gas, water vapor and the like. As the barrier layer, for example, a gas barrier material against oxygen gas, water vapor, etc., a light-shielding material against sunlight, or a material having a fragrance-retaining property against the contents can be used. Specifically, as the barrier layer, for example, an aluminum foil, tin, lead, copper, iron, nickel, an alloy thereof, or the like, or a metal-deposited thin layer such as aluminum can be used. When an aluminum foil is used as the barrier layer, the thickness of the barrier layer can be about 5 μm or more and 20 μm or less. By using the aluminum anchor as the barrier layer, it is possible to facilitate the production of the laminated body 50.

When a metal vapor deposition layer such as aluminum is used as the barrier layer, for example, a physical vapor deposition method such as a vacuum vapor deposition method, a sputtering method, an ion plating method, or a cluster ion beam method (Physical Vapor Deposition method, PVD method) or the like. Can be used to form a thin-film vapor-deposited thin film of a metal such as aluminum on the intermediate layer 57.

When a metal vapor-deposited layer of aluminum is used as the barrier layer, the thickness of the barrier layer is usually preferably about 50 Å or more and 3000 Å or less, and particularly preferably about 100 Å or more and 2000 Å or less. Further, the surface of the intermediate layer 57 supporting the above-mentioned aluminum-deposited thin film can be previously coated with, for example, a vapor-deposited primer or the like in order to improve the adhesion of the vapor-deposited film, and other necessary pretreatment is optional. It is possible to apply to.

Further, the barrier layer may be a transparent thin-film deposition layer that can be formed by a conventionally known method. Since the barrier layer is a transparent thin-film deposition layer, the laminated body 50 can be made transparent. In this case, the barrier layer may be a transparent thin-film deposition layer composed of a thin-film deposition layer of an inorganic oxide.

Examples of the transparent vapor deposition layer include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), and titanium ( A vapor-deposited layer of oxides such as Ti), lead (Pb), zirconium (Zr), and yttrium (Y) can be used. In particular, for tube containers, it is preferable to provide a vapor-deposited layer of aluminum oxide or silicon oxide.

The notation of the inorganic oxide is expressed by MO _X such as SiO _X , AlO _X , etc. (However, in the formula, M represents an inorganic element, and the value of X has a different range depending on the inorganic element). Will be done. The range of the value of X is 0 to 2 for silicon (Si), 0 to 1.5 for aluminum (Al), 0 to 1 for magnesium (Mg), and 0 to 1 for calcium (Ca). Potassium (K) is 0 to 0.5, tin (Sn) is 0 to 2, sodium (Na) is 0 to 0.5, boron (B) is 0 to 1.5, and titanium (Ti). Can take a value in the range of 0 to 2, lead (Pb) of 0 to 2, zirconium (Zr) of 0 to 2, and yttrium (Y) of 0 to 1.5. In the above, when X = 0, it is a completely inorganic simple substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are preferably used as the packaging material, and silicon (Si) is in the range of 1.0 to 2.0 and aluminum (Al) is in the range of 0.5 to 1.5. You can use the one with the value of.

The thickness of the transparent thin-film deposition layer varies depending on the type of inorganic oxide used and the like, but for example, it is desirable to arbitrarily select and form it within the range of 50 Å or more and 2000 Å or less, preferably 100 Å or more and 1000 Å or less. For example, in the case of a vapor-filmed layer of aluminum oxide or silicon oxide, a thickness of 50 Å or more and 500 Å or less, more preferably 100 Å or more and 300 Å or less is desirable.

The transparent thin-film deposition layer can be formed on the intermediate layer 57 by using the following forming method. Examples of the method for forming the vapor deposition layer include a physical vapor deposition method (PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method, or a plasma chemical vapor deposition method and thermochemistry. Examples thereof include a vapor phase growth method, a chemical vapor deposition method such as a photochemical vapor deposition method, and a CVD method. Specifically, a thin-film deposition layer can be formed on a forming roller by using a roller-type vapor-film deposition layer forming apparatus.

Intermediate layer The intermediate layer 57 is a layer for supporting the first sealant layer 51 and the second sealant layer 53 and increasing the strength of the entire laminated body 50, for example. As the material constituting the intermediate layer 57, for example, the same material as the base material layer 52 described above can be used.

In the present embodiment, the thickness of the intermediate layer 57 is preferably 10 μm or more and 25 μm or less.

Anchor coat layer The anchor coat layer 58 is a layer for enhancing the adhesiveness between layers. The anchor coat layer 58 is formed by applying an anchor coat agent and drying it. Examples of the anchor coating agent include any resin having a heat resistant temperature of 135 ° C. or higher, for example, an anchor coating agent made of a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, polyethyleneimine, or the like. An anchor coating agent which is a cured product of a polyacrylic or polymethacrylic resin (polyester) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Further, a silane coupling agent may be used in combination with this as an additive, or nitrocellulose may be used in combination to enhance heat resistance. The anchor coat layer after drying is preferably 1 μm or more and 10 μm or less.

By the way, in the present embodiment, as described above, the first resin layer 51a of the first sealant layer 51 is an extruded resin layer extruded onto the second resin layer 51b. Further, the first resin layer 51a contains linear low-density polyethylene. As a result, even when the laminated bodies 50 are heat-sealed at a low temperature, the first resin of the laminated body 50a (see FIG. 6) located on the outer side in the radial direction (hereinafter, simply referred to as the outer side) in the body sealing portion 32. The amount of melting of the layer 51a and the first resin layer 51a of the laminate 50b (see FIG. 6) located on the inner side in the radial direction (hereinafter, simply referred to as the inner side) can be increased. As a result, in the body seal portion 32, among the first sealant layer 51 (hereinafter, also referred to as the first sealant layer 511) of the laminated body 50a located on the outer side, the laminated body 50b located on the inner side is melted. The amount of the first sealant layer 511 adhered to the first sealant layer 51 (hereinafter, also referred to as the first sealant layer 512) can be increased. Therefore, in the body sealing portion 32, it is possible to suppress the deterioration of the bondability between the laminated bodies 50. Further, among the first sealant layer 512 of the laminated body 50b located inside, by melting, it adheres to the second sealant layer 53 (hereinafter, also referred to as the second sealant layer 531) of the laminated body 50a located on the outer side. The amount of the first sealant layer 512 can be increased. Therefore, in the body sealing portion 32, it is possible to suppress the deterioration of the bondability between the laminated bodies 50. In FIG. 6, in order to clarify the drawing, the drawings other than the first sealant layer 51, the base material layer 52, and the second sealant layer 53 are omitted.

Here, as shown in FIG. 6, in the present embodiment, in the body sealing portion 32, the first sealant layer 511 of the laminated body 50a located on the outer side is melted, and the laminated body 50a located on the outer side is melted. It covers the first end surface 52a of the base material layer 52 and adheres to the first sealant layer 512 of the laminated body 50b located inside. As a result, the bonding strength between the laminated body 50a located on the outer side and the laminated body 50b located on the inner side can be increased. Therefore, it is possible to suppress the problem that the laminated body 50a located on the outer side is peeled off from the laminated body 50b located on the inner side.

In this case, of the first sealant layer 511 of the laminated body 50a located on the outer side, one side (from the second end surface 52b of the base material layer 52) to the first end surface 52a of the base material layer 52 in the circumferential direction D. The length L1 along the circumferential direction D of the first sealant layer 511 melted into (1 end surface 52a) S1 can be, for example, about 0.40 mm or more and 0.80 mm or less.

Further, in the body sealing portion 32, the second sealant layer 53 (hereinafter, also referred to as the second sealant layer 532) of the laminated body 50b located inside is melted, and the base material layer 52 of the laminated body 50b located inside is melted. It covers the second end surface 52b of the above and adheres to the second sealant layer 531 of the laminated body 50a located on the outside. As a result, the bonding strength between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side can be increased. Therefore, it is possible to suppress the problem that the laminated body 50b located on the inner side is peeled off from the laminated body 50a located on the outer side.

In this case, of the second sealant layer 532 of the laminated body 50b located inside, the other side (from the first end surface 52a of the base material layer 52) to the second end surface 52b of the base material layer 52 in the circumferential direction D. The length L2 along the circumferential direction D of the second sealant layer 532 melted into S2 (the side toward the end surface 52b) can be, for example, about 0.40 mm or more and 0.80 mm or less.

Further, the first sealant layer 512 of the laminated body 50b located inside is melted to the other side S2 from the second end surface 52b of the base material layer 52 in the circumferential direction D. As a result, the bonding strength between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side can be further increased. Further, the first sealant layer 512 is melted to the other side S2 from the second end surface 52b of the base material layer 52, so that the thickness of the laminate 50b located inside is gradually reduced toward the other side S2. Can be thinned to. As a result, even when the body seal portion 32 is bent along the longitudinal direction, it is possible to prevent a large force from acting locally on the edge 50c of the laminated body 50b located inside. .. Therefore, even when the body seal portion 32 is bent along the longitudinal direction, the portion that triggers the laminate 50b located inside to be peeled off from the laminate 50a located outside is the body seal portion 32. It can be suppressed from being formed in. As a result, it is possible to effectively suppress the problem that the laminated body 50b located on the inner side is peeled off from the laminated body 50a located on the outer side.

In this case, of the first sealant layer 512 of the laminated body 50b located inside, in the circumferential direction D, the circumferential direction of the first sealant layer 512 melted to the other side S2 from the second end surface 52b of the base material layer 52. The length L3 along D can be, for example, about 0.10 mm or more and 0.50 mm or less.

Further, the second sealant layer 531 of the laminated body 50a located on the outer side is melted to one side S1 of the first end surface 52a of the base material layer 52 in the circumferential direction D. As a result, the bonding strength between the laminated body 50a located on the outer side and the laminated body 50b located on the inner side can be further increased. Further, the second sealant layer 531 melts to one side S1 of the first end surface 52a of the base material layer 52, so that the thickness of the laminated body 50a located on the outer side gradually increases toward one side S1. Can be thinned to. As a result, even when the body seal portion 32 is bent along the longitudinal direction, it is possible to prevent a large force from acting locally on the edge 50d of the laminated body 50a located on the outside. .. Therefore, even when the body seal portion 32 is bent along the longitudinal direction, the portion that triggers the laminate 50a located on the outside to peel off from the laminate 50b located on the inside is the body seal portion 32. It can be suppressed from being formed in. As a result, it is possible to effectively suppress the problem that the laminated body 50a located on the outer side is peeled off from the laminated body 50b located on the inner side.

In this case, of the second sealant layer 531 of the laminated body 50a located on the outer side, in the circumferential direction D, the circumferential direction of the second sealant layer 531 melted to one side S1 of the first end surface 52a of the base material layer 52. The length L4 along D can be, for example, about 0.10 mm or more and 0.50 mm or less.

Further, in the body sealing portion 32 described above, the length along the circumferential direction D of the region where the base material layer 52 of the laminated body 50a located on the outer side and the base material layer 52 of the laminated body 50b located on the inner side overlap each other. L5 (hereinafter, also simply referred to as a wrap width) can be, for example, about 1.0 mm or more and 1.5 mm or less.

In the following description, the seal width of the body seal portion (joint portion) 32 means the total length of the above-mentioned lengths L1, L2, and L5. In this case, the seal width can be, for example, about 1.8 mm or more and 3.1 mm or less.

Although the laminated bodies 50a and 50b are shown in a flat shape in FIG. 6, they are actually rounded in an arc shape. Therefore, the above-mentioned lengths L1 to L5 refer to the lengths along the circumferential direction of the body tube 30.

Next, a method for manufacturing the capped tube container 10A will be described with reference to FIGS. 7 and 8.

First, for example, the laminated body 50 shown in FIG. 2B is prepared. At this time, by printing on the base material layer 52, a second printing layer 55b made of printing ink is formed on the base material layer 52.

Further, the intermediate layer 57 provided with the barrier layer (second barrier layer) 56b and the second sealant layer 53 are prepared.

Next, the base material layer 52 on which the second printing layer 55b is formed, the intermediate layer 57 provided with the barrier layer 56b, and the second sealant layer 53 are joined by, for example, a dry laminating method.

Next, the second resin layer 51b of the first adhesive layer 54a and the first sealant layer 51 is extruded onto the base material layer 52 via the anchor coating material, and then the first sealant layer is extruded onto the second resin layer 51b. The first resin layer 51a of 51 is extruded. As a result, the laminated body 50 shown in FIG. 2B is obtained.

Next, the body tube 30 is manufactured. At this time, first, as shown in FIG. 7A, the heat sealing device 80 is prepared. As shown in FIG. 7A, the heat sealing device 80 includes a power supply 81 and a sealing member 82 connected to the power supply 81. Of these, the seal member 82 has a cylindrical inner seal member 82a and an outer seal member 82b that sandwiches the object to be joined (laminated body 50) together with the inner seal member 82a. In such a heat sealing device 80, by adjusting the output of the power supply 81, the object to be joined can obtain a desired joining state. Electric power is independently supplied to the inner seal member 82a and the outer seal member 82b from the power supply 81. Further, in this case, the output of the power supply 81 when supplying electric power to the inner seal member 82a and the output of the power supply 81 when supplying electric power to the outer seal member 82b are adjusted independently. It is configured to be able to.

Further, as shown in FIG. 7B, the laminated body 50 is prepared.

Next, the laminated body 50 is rolled, and the opposing end portions 35 are joined to each other by, for example, heat sealing to form a cylindrical tube to produce a body tube 30. At this time, first, as shown in FIG. 7C, the laminated body 50 is wound on the outer surface of the cylindrical inner sealing member 82a, and the opposing end portions 35 of the laminated body 50 are overlapped with each other.

Next, as shown in FIG. 7D, the outer seal member 82b is pressed against the portion where the opposite end portions 35 of the laminated body 50 are overlapped with each other, and the inner seal member 82a and the outer seal member 82b are used to press the outer seal member 82b. The portion where the opposite end portions 35 of the laminated body 50 are overlapped with each other is sandwiched.

Next, as shown in FIG. 7 (e), the portions where the opposing end portions 35 of the laminated body 50 are overlapped with each other are joined by heat sealing. At this time, electric power is supplied from the power supply 81 to the inner seal member 82a and the outer seal member 82b, and the inner seal member 82a and the outer seal member 82b generate heat. Then, the heat is transferred to the laminated body 50, and the end portions 35 of the laminated body 50 are joined to each other to form the body seal portion 32. In this way, the body tube 30 is manufactured.

At this time, in the body sealing portion 32, the first sealant layer 511 of the laminated body 50a located on the outer side is melted to cover the first end surface 52a of the base material layer 52 of the laminated body 50 located on the outer side and inside. It adheres to the first sealant layer 512 of the laminated body 50b located at (see FIG. 6). Further, in the body sealing portion 32, the second sealant layer 532 of the laminated body 50b located inside is melted to cover the second end surface 52b of the base material layer 52 of the laminated body 50b located inside, and to the outside. It adheres to the second sealant layer 531 of the positioned laminated body 50a (see FIG. 6).

Next, the tube container 10 described above is manufactured by the compression molding method. At this time, the body tube 30 is inserted into a mold (not shown), and by supplying the molten resin from a resin supply device (not shown) into the mold, one opening 50A of the body tube 30 is provided. The head member 40 is compression molded. As a result, a tube container 10 including the body tube 30 and the head member 40 joined to one end 31 of the body tube 30 is obtained (see FIG. 8).

As described above, the joining of the body tube 30 and the head member 40 is performed by heat welding when the head member 40 is molded by the compression molding method. However, the present invention is not limited to this, and the joining of the body tube 30 and the head member 40 may be performed by an injection molding method.

Next, the cap 20 is attached to the head member 40 of the obtained tube container 10, and the tube container 10A with a cap to which the cap 20 is attached is obtained. After that, the plurality of capped tube containers 10A are transported to a factory or the like for filling the contents C.

Then, the tube container 10A with a cap transported to a factory or the like for filling the content C has, for example, a cleansing agent, toothpaste, and other contents from the opening 50B (see FIG. 8) of the body tube 30. Object C is filled in an appropriate amount. Then, the opening 50B is welded to form the bottom seal portion 34 (see FIG. 1) to obtain a tube container 10A with a cap filled and packaged with the content C.

As described above, according to the present embodiment, the first sealant layer 51 is arranged between the first resin layer 51a having a heat-sealing property, the first resin layer 51a, and the first adhesive layer 54a. It has two resin layers 51b. Further, the first resin layer 51a is an extruded resin layer extruded onto the second resin layer 51b, and the first resin layer 51a contains linear low-density polyethylene. Thereby, when the first sealant layer 51 and the second sealant layer 53 are joined to each other, the bondability between the first sealant layer 51 and the second sealant layer 53 can be improved. In particular, since the layer containing the linear low-density polyethylene is excellent in low-temperature sealing property, the bonding strength of the body sealing portion 32 can be increased even when the laminated bodies 50 are heat-sealed at a low temperature. Therefore, it is possible to form the body seal portion 32 having high bonding strength under various manufacturing conditions. Further, since the linear low-density polyethylene is excellent in impact resistance as compared with, for example, the low-density polyethylene, the first resin layer 51a contains the linear low-density polyethylene, so that the body portion is formed. The impact resistance of the tube 30 can be improved. It should be noted that the ability to improve the bondability between the first sealant layer 51 and the second sealant layer 53 will be described with reference to Examples described later.

Further, according to the present embodiment, the second sealant layer 53 contains linear low-density polyethylene. Thereby, when the first sealant layer 51 and the second sealant layer 53 are joined to each other, the bondability between the first sealant layer 51 and the second sealant layer 53 can be more effectively improved.

Further, according to the present embodiment, the first adhesive layer 54a contains linear low-density polyethylene or low-density polyethylene. As a result, in the body sealing portion 32, the first adhesive layer 54a of the laminated body 50b located on the inner side and the second sealant layer 53 (second sealant layer 531) of the laminated body 50a located on the outer side are melted together. And glue. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side.

Further, according to the present embodiment, the second resin layer 51b and the first adhesive layer 54a each contain linear low-density polyethylene. As a result, in the body seal portion 32, the second resin layer 51b of the first sealant layer 512, the first adhesive layer 54a of the laminate 50b located inside, and the second sealant layer 531 are melted and adhered to each other. .. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side.

Further, according to the present embodiment, the second resin layer 51b contains low-density polyethylene, and the first adhesive layer 54a contains linear low-density polyethylene. Since the first adhesive layer 54a contains the linear low-density polyethylene, the first adhesive layer 54a of the laminate 50b located inside and the second sealant layer 531 are melted and adhered to each other. Therefore, it is possible to improve the adhesiveness between the laminated body 50b located on the inner side and the laminated body 50a located on the outer side. Further, in this case, since the second resin layer 51b contains low-density polyethylene, switching in the process can be completed in a short time.

Further, according to the present embodiment, the linear low-density polyethylene contains a biomass-derived component. This makes it possible to reduce the environmental load of the tube container 10A with a cap and the like.

Further, according to the present embodiment, the laminated body 50 further includes a first barrier layer 56a arranged between the base material layer 52 and the first adhesive layer 54a. This makes it possible to improve the gas barrier property of the body tube 30.

Further, according to the present embodiment, the laminated body 50 further includes a second barrier layer 56b arranged between the base material layer 52 and the second sealant layer 53. Thereby, the barrier property of the body tube 30 can be improved.

Further, according to the present embodiment, the laminated body 50 is located between the first printing layer 55a located on the outer surface 501 side of the first resin layer 51a, and between the base material layer 52 and the first adhesive layer 54a, or. Further, a second printing layer 55b located between the base material layer 52 and the second sealant layer 53 is provided. Thereby, the design of the tube container 10A with a cap or the like can be improved.

Further, according to the present embodiment, the first print layer 55a is provided in the region other than the body seal portion 32, and the second print layer 55b is provided in the region including the body seal portion 32. As a result, a pattern that straddles the body seal portion 32 of the body tube 30 can be displayed to the outside. Therefore, the design of the tube container 10A with a cap or the like can be further improved.

Further, according to the present embodiment, in the body tube 30, the pattern formed on the first print layer 55a and the pattern formed on the second print layer 55b are continuous with each other. Thereby, the design of the tube container 10A with a cap or the like can be further improved.

Next, specific examples in the above-described embodiment will be described.

(Example 1)
First, the laminated body 50 shown in FIG. 2B was produced. At this time, first, a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5200 (trade name), thickness 12 μm) was prepared as the base material layer 52. Subsequently, the second printing layer 55b was formed on the polyethylene terephthalate film.

Further, as the intermediate layer 57, a polyethylene terephthalate film (BR-PET 1312 (trade name), thickness 12 μm, manufactured by Toray Film Processing Co., Ltd.) provided with an aluminum vapor deposition layer (barrier layer 56b) was prepared.

Further, as the second sealant layer 53, a linear low-density polyethylene film (SR-WN2 (trade name), thickness 180 μm, manufactured by DNP Technopack Co., Ltd.) was prepared.

Next, a polyethylene terephthalate film for the base material layer 52, a polyethylene terephthalate film for the intermediate layer 57, and a linear low-density polyethylene film for the second sealant layer 53 are adhered by a dry laminating method to prepare a packaging material intermediate. did. The layer structure of the obtained packaging material intermediate is as follows.
PET / Mark / DL / ALM / PET / DL / LLDPE
In the above, "PET" means polyethylene terephthalate (the same applies hereinafter). Further, "mark" means a printed layer (same below), and "DL" is a two-component curable urethane adhesive (main agent: polyester resin, curing agent: aliphatic polyisocyanate, mass after drying 3). It means an adhesive layer by a dry laminating method using .5 g / m ² ) (the same applies hereinafter). Further, "ALM" means an aluminum vapor deposition layer (the same applies hereinafter). Further, "LLDPE" means linear low density polyethylene (and so on).

Next, as a resin for the first resin layer 51a of the first sealant layer 51, linear low-density polyethylene (Evolu, SP1071C (trade name) manufactured by Prime Polymer Co., Ltd.) was prepared. Further, as the second resin layer 51b of the first sealant layer 51, a film prepared using linear low-density polyethylene (Evolu, SP2320 (trade name), thickness 90 μm, manufactured by Prime Polymer Co., Ltd.) was prepared. .. Further, as a resin for the first adhesive layer 54a, linear low-density polyethylene (Evolu, SP1071C (trade name) manufactured by Prime Polymer Co., Ltd.) was prepared.

Next, the linear low-density polyethylene as the first adhesive layer 54a is extruded onto the base material layer 52 of the packaging material intermediate described above via the anchor coating material, and the first sealant layer is placed on the first adhesive layer 54a. The second resin layer 51b as 51 was laminated. The thickness of the first adhesive layer 54a was set to 20 μm.

Further, the linear low-density polyethylene as the first resin layer 51a is extruded onto the second resin layer 51b as the first sealant layer 51, and the first resin as the first sealant layer 51 is extruded on the second resin layer 51b. Layers 51a were laminated. The thickness of the first resin layer 51a was set to 20 μm. Subsequently, the first printing layer 55a was formed on the first resin layer 51a. In this way, the laminated body 50 was produced. The layer structure of the obtained laminated body 50 is as follows.
Mark / LLDPE / LLDPE / LLDPE / Anchor / PET / Mark / DL / ALM / PET / DL / LLDPE
In the above, "anchor" means an anchor coat layer (same below).

In addition, the tube container 10 shown in FIG. 1 was manufactured using the obtained laminate 50. When the body tube 30 of the tube container 10 was manufactured, the laminated body 50 was joined by heat sealing by the inner sealing member 82a and the outer sealing member 82b. In this case, first, the laminated body 50 is positioned at a predetermined position (hereinafter, simply referred to as a reference position) with respect to the inner seal member 82a and the outer seal member 82b. Next, the output of the power supply 81 when supplying electric power to the inner seal member 82a is set to 222.0 W (hereinafter, also simply referred to as a steady output), and when electric power is supplied to the outer seal member 82b. The output of the power supply 81 was set to 350.0 W (hereinafter, also simply referred to as a steady output), and 100 body tubes 30 were manufactured. Further, the output of the power supply 81 when supplying electric power to the inner seal member 82a is set to an output (that is, 233.1 W) increased by 5% from the steady output, and electric power is supplied to the outer seal member 82b. The output of the power supply 81 at the time of the operation was increased by 5% from the steady output (that is, 367.5 W), and 100 body tubes 30 were manufactured. Further, the output of the power supply 81 when supplying electric power to the inner seal member 82a is set to an output (that is, 210.9 W) which is 5% lower than the steady output, and electric power is supplied to the outer seal member 82b. The output of the power supply 81 at the time of the operation was reduced by 5% from the steady output (that is, 332.5 W), and 100 body tubes 30 were manufactured. At this time, the seal width (L1 + L2 + L5) of the body seal portion 32 was set to 2.5 mm. The wrap width (L5) was set to 1.2 mm. Further, the length L of the body tube 30 was set to 125.4 mm.

Further, the output of the power supply 81 when supplying electric power to the inner seal member 82a and the outer seal member 82b is taken as a steady output, and the seal width (L1 + L2 + L5) of the body seal portion 32 is 3.0 mm and the wrap width (Lap width). L5) produced 50 1.7 mm body tubes 30 each. Further, the output of the power supply 81 when supplying electric power to the inner seal member 82a and the outer seal member 82b is taken as a steady output, and the seal width (L1 + L2 + L5) of the body seal portion 32 is 2.0 mm and the wrap width (Lap width). L5) produced 50 0.7 mm body tubes 30 each.

Further, the output of the power supply 81 when supplying electric power to the inner seal member 82a and the outer seal member 82b is taken as a steady output, respectively, and the position of the laminated body 50 with respect to the inner seal member 82a and the outer seal member 82b (hereinafter, simply seal). The body tube 30 was manufactured by changing the position). At this time, the sealing position is shifted from the reference position toward the traveling direction of the laminated body 50 by 10%, 15%, and 20% of the length L of the body tube 30, and the laminated body 50 is heat-sealed at each position. Joined by. Then, under each condition, 50 body tubes 30 were manufactured.

(1) Appearance Evaluation Next, each body seal portion 32 was cut, and the horizontal cross-sectional shape of the body seal portion 32 was observed to evaluate the appearance.

(2) Joint strength evaluation test In addition, a joint strength evaluation test was conducted on the body seal portion 32 in accordance with JIS K7127. As the test piece, the output of the power supply 81 when supplying electric power to the inner seal member 82a and the outer seal member 82b is set as a steady output, respectively, and the body is manufactured by joining the laminate 50 at the reference position by heat sealing. A rectangular portion having a width of 15 mm and a length of 100 mm was cut out from the portion tube 30 and used. At this time, in the body tube 30, the seal width (L1 + L2 + L5) of the body seal portion 32 was 2.5 mm, and the wrap width (L5) was 1.2 mm. Further, when cutting out the body tube 30, the body tube is such that the longitudinal direction of the test piece is the circumferential direction of the body tube 30 and the body seal portion 32 is located substantially in the center of the longitudinal direction of the test piece. 30 was cut out. In this way, three test pieces were prepared. Next, the tensile strength of the body seal portion 32 was measured for these test pieces using a tensile tester (STA-1150, manufactured by Orientec Co., Ltd.).

In the measurement of tensile strength, the test piece was pulled by grasping both ends of the test piece in the longitudinal direction with a pair of grips of the measuring instrument and moving the grips in opposite directions to each other. The tensile speed for pulling the test piece was set to 300 mm / min. Then, the obtained tensile strength was used as the joint strength of the body sealing portion 32.

(Example 2)
The appearance evaluation and the bonding strength evaluation test were carried out in the same manner as in Example 1 except that low-density polyethylene (manufactured by Japan Polyethylene Corporation, Novatec LC600A (trade name)) was used as the resin for the first adhesive layer 54a. gone. The layer structure of the laminated body 50 according to the second embodiment is as follows.
Mark / LLDPE / LLDPE / LDPE / Anchor / PET / Mark / DL / ALM / PET / DL / LLDPE
In the above, "LDPE" means low density polyethylene (same below).

(Comparative example)
Low density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec, LC600A (trade name)) was used as the resin for the first resin layer 51a of the first sealant layer 51, and the second resin layer 51b of the first sealant layer 51 Except that the thickness was 60 μm, low density polyethylene (Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) was used as the resin for the first adhesive layer 54a, and the thickness of the second sealant layer 53 was 210 μm. The appearance evaluation and the joint strength evaluation test were carried out in the same manner as in Example 1. The layer structure of the laminated body according to the comparative example is as follows.
Mark / LDPE / LLDPE / LDPE / Anchor / PET / Mark / DL / ALM / PET / DL / LLDPE

The above results are shown in Tables 1 to 4. Tables 1 to 3 show the results of appearance evaluation, and Table 4 shows the results of the joint strength evaluation test.

In addition, in Tables 1 to 3 above, as shown in FIG. 6, "○" of the evaluation indicates that the first sealant layer 511 of the laminated body 50a located on the outside is melted in the body sealing portion 32 and is outside. It means that the first end surface 52a of the base material layer 52 of the laminated body 50a located in the above was covered and adhered to the first sealant layer 512 of the laminated body 50b located inside.

On the other hand, in Tables 1 to 3 above, as shown in FIG. 9, "x" in the evaluation indicates that the first sealant layer 511 of the laminated body 50a located on the outside of the body sealing portion 32 is located on the outside. It does not cover the first end surface 52a of the base material layer 52 of the laminate 50a, and is between the first sealant layer 511 of the laminate 50a located on the outside and the first sealant layer 512 of the laminate 50b located on the inside. This means that a step was formed so as to expose the first end surface 52a of the base material layer 52. In FIG. 9, in order to clarify the drawing, the drawings other than the first sealant layer 51, the base material layer 52, and the second sealant layer 53 are omitted.

As a result, in the tube container according to the comparative example, when the seal position is shifted by 15% or more, the first sealant layer 511 of the laminate 50a located on the outside of the body seal portion 32 becomes the laminate 50a located on the outside. It did not cover the first end surface 52a of the base material layer 52. In this case, the first sealant layer 511 of the laminated body 50a located on the outer side covers the first end surface 52a of the base material layer 52 of the laminated body 50a located on the outer side. It is considered that the joint strength may be insufficient. Further, in these cases, when the body sealing portion 32 is folded along the longitudinal direction, for example, a large force is locally applied to the edge 50d of the laminated body 50a shown in FIG. It is considered that a part that triggers the peeling can be formed. Then, it is considered that the laminated bodies 50 may be easily peeled off from the portion that triggers the stacking.

On the other hand, in the tube container 10 according to Examples 1 and 2, in the body sealing portion 32, the first sealant layer 511 of the laminated body 50a located on the outside is the base material layer 52 of the laminated body 50a located on the outside. It covered the first end surface 52a and adhered to the first sealant layer 512 of the laminated body 50b located inside. In this case, it is considered that the bonding strength between the laminated bodies 50 is increased and the peeling of the laminated bodies 50 is suppressed. Therefore, according to the present embodiment, the bonding strength between the laminated bodies 50 can be increased, and the peeling of the laminated bodies 50 can be suppressed.

As described above, it was found that in the tube container 10 according to Example 1 and Example 2, the bonding strength between the laminated bodies 50 can be increased under various manufacturing conditions. Therefore, it was found that the tube container 10 having sufficient bonding strength can be manufactured in the body sealing portion 32 without reviewing the manufacturing conditions depending on the season or room temperature.

Further, as shown in Table 4, in the tube container according to the comparative example, the joint strength of the body seal portion was 107.5 (N). On the other hand, in the tube container 10 according to Example 1, the joint strength of the body sealing portion 32 was 119.4 (N). Further, in the tube container 10 according to Example 2, the joint strength of the body sealing portion 32 was 120.4 (N). As described above, in the tube container 10 according to Example 1 and Example 2, the joint strength of the body sealing portion 32 could be increased.

It is also possible to appropriately combine the plurality of components disclosed in the above-described embodiment as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiment.

10 Tube container 10A Tube container with cap 20 Cap 30 Body tube 31 One end 32 Body seal 35 End 40 Head member 50 Laminated body 50a Laminated body 50b Laminated body 501 Outer surface 502 Inner surface 51 First sealant layer 511 First sealant Layer 512 1st sealant layer 51a 1st resin layer 51b 2nd resin layer 52 Base material layer 53 2nd sealant layer 531 2nd sealant layer 532 2nd sealant layer 55a 1st printing layer 55b 2nd printing layer 56a 1st barrier layer 56b Second barrier layer

Claims (13)

In packaging materials for tube containers
A first sealant layer, an adhesive layer, a base material layer, and a second sealant layer arranged in order from the outer surface to the inner surface are provided.
The first sealant layer has a first resin layer having a heat-sealing property and a second resin layer arranged between the first resin layer and the adhesive layer.
The first resin layer is an extruded resin layer extruded onto the second resin layer.
The first resin layer is a packaging material for a tube container containing linear low-density polyethylene. The packaging material for a tube container according to claim 1, wherein the second sealant layer contains linear low-density polyethylene. The packaging material for a tube container according to claim 2, wherein the adhesive layer contains linear low-density polyethylene or low-density polyethylene. The packaging material for a tube container according to claim 2, wherein the second resin layer and the adhesive layer each contain linear low-density polyethylene. The packaging material for a tube container according to claim 2, wherein the second resin layer contains low-density polyethylene, and the adhesive layer contains linear low-density polyethylene. The packaging material for a tube container according to any one of claims 1 to 5, wherein the linear low-density polyethylene contains a biomass-derived component. The packaging material for a tube container according to any one of claims 1 to 6, further comprising a first barrier layer arranged between the base material layer and the adhesive layer. The packaging material for a tube container according to any one of claims 1 to 7, further comprising a second barrier layer arranged between the base material layer and the second sealant layer. A second printed layer located on the outer surface side of the first resin layer and between the base material layer and the adhesive layer, or between the base material layer and the second sealant layer. The packaging material for a tube container according to any one of claims 1 to 8, further comprising a printing layer. In a tube container
A body tube having a joint portion in which opposite ends of the tube container packaging material according to any one of claims 1 to 9 are overlapped and joined to each other.
A tube container comprising a head member joined to one end of the body tube. In a tube container
A body tube having a joint portion in which opposite ends of the tube container packaging material according to claim 9 are overlapped and joined to each other.
A head member joined to one end of the body tube is provided.
The first print layer is provided in a region other than the joint portion, and the first print layer is provided in a region other than the joint portion.
The second printing layer is a tube container provided in a region including the joint portion. The tube container according to claim 11, wherein in the body tube, the pattern formed on the first printing layer and the pattern formed on the second printing layer are continuous with each other. In a tube container with a cap
The tube container according to any one of claims 10 to 12, and the tube container.
A tube container with a cap, comprising a cap attached to the head member.

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