Laminate tube

Abstract

To suppress the dissolution of a metal vapor deposition layer.SOLUTION: A laminate tube 1 comprises: a body 2 having a laminated body 10 at least including a plastic film 104 formed with a metal vapor deposition layer 104a; and a head 3 joined to the body 2, and the laminated body 10 includes a resin coat layer 105 coated so as to directly cover at least a part of the metal vapor deposition layer 104a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] One aspect of the present invention relates to a laminate tube. [Background technology]

[0002] A laminate tube is known in which the laminate constituting the body includes, from the outer layer, a sealant layer, a printed substrate layer, a metal vapor deposition layer, an intermediate layer, a barrier layer, and a sealant layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-060272 Summary of the Invention [Problem to be solved by the invention]

[0004] In the laminated tube described above, for example, if the shoulder is immersed in the contents, the contents may enter through the joint between the shoulder and the body, causing the metal deposition layer to dissolve. If the metal deposition layer dissolves, problems such as deterioration of the contents and poor appearance may occur due to a decrease in barrier properties.

[0005] One aspect of the present invention has been made in view of the above circumstances, and relates to a laminate tube capable of suppressing dissolution of a vapor-deposited metal layer. [Means for solving the problem]

[0006] A laminated tube according to one embodiment of the present invention comprises a body having a laminate including at least a plastic film on which a metal vapor deposition layer is formed, and a head joined to the body, the laminate including a resin coating layer applied so as to directly cover at least a portion of the metal vapor deposition layer.

[0007] In the laminated tube according to one embodiment of the present invention, a resin coating layer is applied to the laminate constituting the body so as to be in contact with the metal vapor deposition layer. With this configuration, for example, when the shoulder of the head is immersed in the contents and the contents enter through the joint between the shoulder and the body, the resin coating layer acts as a barrier to prevent the contents from reaching the metal vapor deposition layer. This makes it possible to effectively prevent the metal vapor deposition layer from dissolving.

[0008] The resin coating layer may be mainly composed of a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, or a polyester resin, and such a resin coating layer can adequately perform the above-mentioned barrier function and can effectively suppress dissolution of the metal deposition layer.

[0009] The amount of resin coating layer applied is 0.5 g / m 2 Such a resin coating layer can adequately fulfill the above-mentioned role of a barrier, and can suitably suppress dissolution of the metal vapor deposition layer.

[0010] The metal vapor deposition layer may be disposed outside the middle position in the thickness direction of the laminate. In this way, by disposing the glossy metal vapor deposition layer on the outside of the laminate, the design of the laminate can be improved. Effect of the Invention

[0011] According to one aspect of the present invention, it is possible to provide a laminate tube capable of suppressing dissolution of a vapor-deposited metal layer. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic front view of a laminate tube according to this embodiment. [Diagram 2] FIG. 2 is a partial cross-sectional schematic view of a laminate used in the body of the laminate tube shown in FIG. [Diagram 3] FIG. 3 is a diagram illustrating an embodiment of the storage test. [Figure 4] FIG. 4 is a table showing the results of the storage test. [Diagram 5] FIG. 5 is a diagram for explaining an embodiment of a tube resistance test for contents. [Figure 6] FIG. 6 is a table showing the results of the tube contents resistance test, adhesion test, and laminate strength test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals. Duplicate explanations will be omitted. The dimensional ratios of the drawings do not necessarily match those in the description.

[0014] FIG. 1 is a schematic front view of a laminated tube 1 according to this embodiment. The laminated tube 1 is a type of tube, a container from which the fluid contents can be easily squeezed out and from which the exterior design can be printed as desired. The laminated tube 1 is widely used for storing semi-solid materials such as food, dentifrices, medicines, cosmetics, paints, adhesives, etc. The laminated tube 1 is superior to metal tubes and the like in terms of elasticity and shape recovery. The laminated tube 1 includes a body 2 and a head 3 joined to the body 2.

[0015] The head 3 has a cylindrical mouth 31 and a truncated cone-shaped shoulder 32 that connects the mouth 31 and the body 2. A topped cylindrical lid (not shown) is attached to the mouth 31. A male thread (not shown) that meshes with the female thread of the lid may be formed on the outer periphery of the mouth 31. The laminated tube 1 is configured to be sealed by attaching the lid (not shown) to the mouth 31. The head 3 is made of a material that is highly compatible with the body 2 and does not affect the contents, and may be made of, for example, a thermoplastic resin.

[0016] The body 2 is composed of a laminate 10 including at least a plastic film 104 on which a metal deposition layer 104a is formed. The laminate 10 is supplied in a wound state by, for example, an AMS machine and cut. The cut laminate 10 is rolled into a cylindrical shape and heat-sealed at the side seal portion to form the body 2 of the laminated tube 1. Then, the shoulder portion 32 of the head 3 formed by, for example, compression molding and the laminate 10 of the body 2 are heat-sealed and joined to each other, thereby forming the laminated tube 1.

[0017] Fig. 2 is a partial cross-sectional schematic diagram of a laminate 10 used in the body 2 of the laminate tube 1 shown in Fig. 1. The upper side in Fig. 2 is the surface side of the laminate 10, and the lower side is the liquid-contacting surface side of the laminate 10. As shown in Fig. 2, the laminate 10 has, for example, an extruded polyethylene layer 101, an AC agent 102, an ink layer 103, a plastic film 104, a resin coat layer 105, an adhesive layer 106, a substrate layer 107, an extruded polyethylene layer 108, an AC agent 109, a gas barrier film 110, an adhesive layer 111, and a sealant layer 112 laminated from the surface side toward the liquid-contacting surface side.

[0018] The color of the base layer 107 is not particularly limited, but for example, a white polyethylene film can be used. The presence of the base layer 107 allows the laminate tube 1 to have basic mechanical properties such as shape retention and restoration.

[0019] The gas barrier film 110 is provided when the contents are food or medicine, for example, and gas barrier properties are required. The gas barrier film 110 is composed of a base film and a gas barrier layer. The gas barrier layer may be an inorganic compound layer provided on the base film by a vapor deposition method, or may be an inorganic compound layer further provided by overlaying it by a coating method.

[0020] The substrate film of the gas barrier film is a film made of a polymer resin composition, and may be selected appropriately according to the application, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc. In particular, polypropylene and polyethylene terephthalate are preferable in terms of film strength and cost when used as the substrate film.

[0021] The adhesive layer 111 is used to bond the gas barrier film 110 and the sealant layer 112 together. The type of adhesive layer 111 is not particularly limited, but may be appropriately selected taking into consideration adhesion to the film and safety when the laminated tube 1 is used for food or the like. For example, a two-liquid curing type urethane adhesive layer can be used as the adhesive layer 111. The method of bonding using the adhesive layer 111 is also not particularly limited, but for example, a dry lamination method is used.

[0022] The base material layer 107 and the gas barrier film 110 can be laminated via, for example, an extruded polyethylene layer 108 and an AC agent 109. In this case, the gas barrier film 110 may be used with the base material film facing either the front surface side or the liquid-contacting surface side of the laminate tube 1.

[0023] The plastic film 104 is provided on the opposite side of the extruded polyethylene layer 108 in the base layer 107 via the adhesive layer 106. The plastic film 104 has a metal deposition layer 104a and a film layer 104b. The metal deposition layer 104a is provided, for example, on the adhesive layer 106 side. The metal deposition layer 104a may be disposed outside the middle position in the thickness direction of the laminate 10. All layers outside the metal deposition layer 104a may be transparent. In this case, the glossy metal deposition layer 104a is visible, and the design and aesthetics of the laminate 10 can be improved. The metal constituting the metal deposition layer 104a is not limited, but aluminum may be used, for example, in terms of cost and productivity. The plastic film 104 may be composed of, for example, a polyethylene terephthalate film or a polypropylene film.

[0024] An ink layer 103 is provided by printing on the front surface of the plastic film 104. As a printing method, a normal gravure printing method or the like can be used.

[0025] Here, the laminate 10 includes a resin coating layer 105 applied so as to directly cover at least a part of the metal deposition layer 104a. The resin coating layer 105 directly covers, for example, the entire metal deposition layer 104a. The resin coating layer 105 may have, as a main component, for example, a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, or a polyester resin. The main component here means, for example, the component that occupies the largest weight ratio in the resin coating layer 105, and may mean, for example, a weight ratio of 50% or more. The application amount of the resin coating layer 105 is 0.5 g / m 2 or more, and may be 0.8 g / m 2 or more, and may be 1.0 g / m 2 It may be more than that.

[0026] Next, the function and effect of the laminate tube 1 according to this embodiment will be described.

[0027] The laminated tube 1 comprises a body 2 having a laminate 10 including at least a plastic film 104 on which a metal vapor deposition layer 104a is formed, and a head 3 joined to the body 2, and the laminate 10 includes a resin coating layer 105 applied so as to directly cover at least a portion of the metal vapor deposition layer 104a.

[0028] In the laminated tube 1 according to this embodiment, the resin coating layer 105 is applied to the laminate 10 constituting the body 2 so as to be in contact with the metal vapor deposition layer 104a. With this configuration, for example, when the shoulder opening 32a of the head 3 is immersed in the contents and the contents enter through the joint between the shoulder opening 32a and the body 2, the resin coating layer 105 acts as a barrier to prevent the contents from reaching the metal vapor deposition layer 104a. This makes it possible to suitably prevent the metal vapor deposition layer 104a from dissolving.

[0029] The resin coating layer 105 may be mainly composed of a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, or a polyester resin, and such a resin coating layer 105 can adequately perform the above-mentioned barrier function and can effectively prevent the metal deposition layer 104a from dissolving.

[0030] The amount of resin coating layer 105 applied is 0.5 g / m 2 Such a resin coat layer 105 can adequately fulfill the above-mentioned role of a barrier, and can suitably suppress dissolution of the metal vapor deposition layer 104a.

[0031] The metal vapor deposition layer 104a may be disposed outside the middle position in the thickness direction of the laminate 10. In this manner, by disposing the glossy metal vapor deposition layer 104a on the outside of the laminate 10, the design of the laminate 10 can be improved.

[0032] [Example] The effects of the laminate tube 1 according to this embodiment will be described in detail with reference to the following examples and comparative examples. Note that the present invention is not limited to the following examples.

[0033] (Preservation test) FIG. 3 is a diagram for explaining the aspect of the storage test. Toothpaste (assumed to be the contents of the laminated tube 1) 200 was placed on the metal deposition layer 104a of the plastic film 104, and the temperature was set to 25° C., humidity was free, and the storage period was set to 7 days, and the dissolution state of the metal deposition layer 104a was confirmed from the film layer 104b side of the plastic film 104. After the storage period, the oxygen permeability and water vapor permeability of the metal deposition layer 104a were measured to confirm the barrier properties. The oxygen permeability was measured using an OX-TRAN manufactured by MOCON as a measuring device, and was performed under the measurement conditions of 20° C. and 65% RH. The water vapor permeability was measured using a PERMATRAN manufactured by MOCON as a measuring device, and was performed under the measurement conditions of 40° C. and 90% RH.

[0034] The storage test was carried out on the plastic films 104 of Examples 1 to 3 and the plastic film of Comparative Example 4 below. Example 1: A plastic film 104 in which a resin coating layer 105 mainly composed of vinyl chloride-vinyl acetate copolymer resin is applied to a metal deposition layer 104a. The basic structure is the same as the plastic film 104 and the resin coating layer 105 of the laminate tube 1 described in the embodiment. Plastic film 104 is Tetolite PC 12μm manufactured by Oike Pack Materials Co., Ltd. The main component of the resin coating layer 105 is a vinyl chloride-vinyl acetate copolymer resin. The amount of resin coating layer 105 applied is 0.5 g / m 2 , 0.8g / m 2 , 1.0g / m 2 Three patterns Example 2: A plastic film 104 in which a resin coating layer 105 mainly made of acrylic resin is applied to a metal deposition layer 104a. The structure is the same as that of Example 1, except that the main component of the resin coating layer 105 is an acrylic resin. Example 3: A plastic film 104 in which a resin coating layer 105 mainly made of polyester resin is applied to a metal deposition layer 104a. The structure is the same as that of the above-mentioned Examples 1 and 2, except that the main component of the resin coating layer 105 is a polyester resin. Comparative Example 4: Plastic film without resin coating layer 105 The configuration is the same as that of the above-mentioned Examples 1 to 3, except that the resin coating layer 105 is not included.

[0035] FIG. 4 is a table showing the results of the storage test. As shown in FIG. 4, in the plastic film of Comparative Example 4 that does not have the resin coating layer 105, dissolution of the metal deposition layer 104a by the toothpaste 200 was visually confirmed. On the other hand, in the plastic films 104 of Examples 1 to 3, dissolution of the metal deposition layer 104a by the toothpaste 200 was visually confirmed even when the application amount of the resin coating layer 105 (0.5 g / m 2 , 0.8g / m 2 , or 1.0 g / m 2 ) and no dissolution of the metal vapor deposition layer 104a by the toothpaste 200 was visible. As described above, by providing the resin coating layer 105, dissolution of the metal vapor deposition layer 104a could be effectively suppressed.

[0036] As shown in FIG. 4, in the plastic film of Comparative Example 4, the oxygen permeability of the metal deposition layer 104a after the storage period was 23.3 cc / (m 2 ·day), which means that the water vapor permeability is out of range. The oxygen permeability of the metal deposition layer 104a, which was not dissolved at all, was 0.4 cc / (m 2 ·day), water vapor permeability is 1.5g / (m 2 ·day), it can be seen that dissolution of the metal deposition layer 104a has progressed considerably in the plastic film of Comparative Example 4. On the other hand, in the plastic films 104 of Examples 1 to 3, the oxygen permeability of the metal deposition layer 104a is 0.4 to 0.6 cc / (m 2 ·day), and water vapor permeability is 1.5~1.7g / (m 2·days), which were comparable to the oxygen permeability and water vapor permeability of the undissolved metal vapor-deposited layer 104a. As described above, by providing the resin coating layer 105, the barrier properties were improved and the dissolution of the metal vapor-deposited layer 104a could be effectively suppressed.

[0037] (Tube resistance test) FIG. 5 is a diagram for explaining the aspect of the tube contents resistance test. Ten laminate tubes each were made using the plastic films 104 of Examples 1 to 3 and the plastic film of Comparative Example 4 described above, and the shoulder 32a and part of the body 2 of each laminate tube were immersed in toothpaste 200 to confirm the dissolution state of the metal vapor deposition layer 104a. The temperature was 25°C, humidity was free, and the storage period (immersion period) was 7 days. The layer configuration of the laminate tube made is the same as that of the laminate tube 1 described in the embodiment. A polyurethane-based adhesive was used as the adhesive layers 106, 111, and the application amount was 3.5 g / m 2 The thickness of the metal deposition layer 104a was set to 12 μm.

[0038] Fig. 6 is a table showing the results of the tube resistance test for contents, the adhesion test (described later), and the laminate strength test (described later). As shown in Fig. 6, in the laminate tube of Comparative Example 4, which does not have the resin coating layer 105, dissolution of the metal vapor deposition layer 104a by the toothpaste 200 was visually confirmed in all ten laminate tubes. On the other hand, in the laminate tubes of Examples 1 to 3, dissolution of the metal vapor deposition layer 104a by the toothpaste 200 was visually confirmed in the coating amount (0.5 g / m 2 , 0.8g / m 2 , or 1.0 g / m 2 ) and no dissolution of the metal vapor deposition layer 104a by the toothpaste 200 was visible. As described above, by providing the resin coating layer 105, dissolution of the metal vapor deposition layer 104a could be effectively suppressed.

[0039] (Adhesion test) In order to confirm the adhesion of the resin coating layer 105 to the metal deposition layer 104a, a test was conducted in which cellophane tape manufactured by Nichiban Co., Ltd. was attached to the resin coating layer 105 and then peeled off to check whether the resin coating layer 105 peeled off. As shown in FIG. 6, in the configurations of Examples 1 to 3, the coating amount of the resin coating layer 105 (0.5 g / m 2 , 0.8g / m 2 , or 1.0 g / m 2 Regardless of the above, peeling of the resin coating layer 105 did not occur.

[0040] (Laminate strength test) For the plastic films 104 of Examples 1 to 3, the metal vapor deposition layer 104a and the base material layer were attached with an adhesive, and the partially peeled-off portion was pulled to measure the laminate strength. Similarly, for the plastic film of Comparative Example 4, the metal vapor deposition layer and the base material layer were attached with an adhesive, and the partially peeled-off portion was pulled to measure the laminate strength. V-4 white, 100 μm, manufactured by Tamapoly Co., Ltd. was used as the base material layer. A polyurethane adhesive was used as the adhesive, and the application amount was 3.5 g / m 2 The pulling speed was set to 300 mm / min, and T-type peeling was performed.

[0041] As shown in FIG. 6, in the configuration of Example 1, when the measured tensile value was 2.7 to 3.0 N / 15 mm, peeling occurred between the metal deposition layer 104a and the film layer 104b. In addition, in the configuration of Example 2, when the measured tensile value was 0.7 N / 15 mm, peeling occurred between the resin coat layer 105 and the adhesive layer. In addition, in the configuration of Example 3, when the measured tensile value was 2.6 to 2.9 N / 15 mm, peeling occurred between the metal deposition layer 104a and the film layer 104b. In contrast, in the configuration of Comparative Example 4, when the measured tensile value was 2.7 N / 15 mm, the plastic film broke. As described above, it was confirmed that although some strength reduction was observed in the configurations of Examples 1 to 3, there was no problem in practical use.

[0042] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The present invention is intended to include all modifications within the scope indicated by the claims and the meaning and scope equivalent to the claims.

[0043] Various embodiments of the present invention can be defined as follows:

[0044] (Appendix 1) A body portion having a laminate including at least a plastic film on which a metal vapor deposition layer is formed; A head portion is joined to the body portion, The laminate includes a resin coating layer applied so as to directly cover at least a portion of the metal vapor deposition layer.

[0045] (Appendix 2) 2. The laminate tube according to claim 1, wherein the resin coating layer is mainly composed of a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, or a polyester resin.

[0046] (Appendix 3) The coating amount of the resin coating layer is 0.5 g / m 2 The laminate tube according to claim 1 or 2,

[0047] (Appendix 4) 4. The laminate tube according to claim 1, wherein the metal vapor deposition layer is disposed outside a middle position in a thickness direction of the laminate. [Explanation of symbols]

[0048] 1... laminated tube, 2... body portion, 3... head portion, 10... laminated body, 104... plastic film, 104a... metal vapor deposition layer, 105... resin coating layer.

Claims

1. A body portion having a laminate including at least a plastic film on which a metal vapor deposition layer is formed; A head portion joined to the body portion, The laminate includes a resin coating layer applied so as to directly cover at least a portion of the metal vapor deposition layer.

2. 2. The laminate tube according to claim 1, wherein the resin coating layer is mainly made of a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, or a polyester resin.

3. The coating amount of the resin coating layer is 0.5 g / m ２ The laminate tube according to claim 1 .

4. 4. The laminate tube according to claim 1, wherein the metal vapor deposition layer is disposed outside a middle position in a thickness direction of the laminate.

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