Manufacturing method of tube container

Abstract

To provide a tube container which is superior in handleability and is capable of suppressing elution of an adhesive from an end part of a tape material and interlayer peeling in the tape material.SOLUTION: A tube container comprises: a barrel part which is constituted by making a sheet, having a pair of facing end edges, into a cylindrical shape and in which tape materials are stuck to parts along each of the pair of end edges in an inner surface of the sheet; and a pour-out port part attached to one end of the barrel part. The tape material has a belt-like base material, and both surfaces and end surfaces of the base material are coated with a resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tube container and a method for manufacturing the tube container. [Background technology]

[0002] Tube containers made primarily of resin are widely used as packaging materials for medicines, cosmetics, food, etc. For example, Patent Document 1 describes a tube container that is composed of a dispensing unit for extracting the contents and a body that is welded to the dispensing unit and that contains the contents. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-199280 Summary of the Invention [Problem to be solved by the invention]

[0004] The body of a tube container is formed by forming a sheet constituting the body into a cylindrical shape and gluing both ends together. Methods for gluing sheets together include butt-and-seal sealing, in which the inner surfaces of the sheets are glued together and welded; butt-and-seal tape sealing, in which the butt-and-sealed portions of the sheets are butted together and sealed with tape; and envelope tape sealing, in which the inner and outer surfaces of the sheets are overlapped and sealed with tape. However, with butt-and-seal sealing, the glued portion protrudes from the body, which makes it difficult to handle because the glued portion comes into contact with the hand during use.

[0005] Butt-taping and envelope-taping, which use tape to seal, are preferable in terms of ease of handling because the tape protrudes less from the body than flat-bottom taping. The tape used to seal the body includes a resin layer that can be welded to the body, as well as a barrier layer to ensure the barrier properties of the bonded area. When the tape has a multilayer structure, the adhesive between the layers may be exposed from the edge of the tape, potentially leaching into the contents. Furthermore, because the interfaces between the layers of the tape are exposed, there is a risk of delamination between the layers of the tape that make up the body.

[0006] Therefore, an object of the present invention is to provide a tube container that is easy to handle and can prevent adhesive from leaching out from the ends of the tape material and delamination of the tape material. [Means for solving the problem]

[0007] Tube container according to the present invention Manufacturing method teeth, A method for manufacturing a tube container comprising a cylindrical sheet having a pair of opposing edges, a body portion in which tape material is attached along each of the pair of edges on the inner surface of the sheet, and a spout portion attached to one end of the body portion, wherein the tape material comprises a strip-shaped substrate having barrier properties, a first resin laminated on the body side of the substrate, and a second resin laminated on the opposite side of the substrate from the body portion, the first resin layer being 10 μm or more and 70 μm or less in thickness, and the second resin layer being 10 μm or more and 70 μm or less in thickness, the end faces of the tape material being coated with the same resin as the first resin or the second resin, and the tape material and the body portion are heat-sealed using a seal bar that is narrower than the tape material. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a tube container that is easy to handle and can prevent adhesive from leaching out from the ends of the tape material and delamination of the tape material. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view showing a schematic configuration of a tube container according to an embodiment. [Figure 2] End view taken along line II-II in Figure 1 [Figure 3] FIG. 1 is a cross-sectional view showing an example of a sheet constituting the body of a tube container. [Figure 4] A diagram illustrating the state before the tape material is attached to the body. [Figure 5] A diagram illustrating the state before the tape material is attached to the body. [Figure 6] A diagram illustrating the state after the tape material is attached to the body. [Figure 7] FIG. 2 is a perspective view of the spout shown in FIG. 1. [Figure 8] Cross-sectional view taken along line VIII-VIII in Figure 7 DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 is a front view showing a schematic configuration of a tube container according to an embodiment, FIG. 2 is an end view along the line II-II shown in FIG. 1, and FIG. 3 is a cross-sectional view showing an example of a sheet constituting the body of the tube container.

[0011] The tube container 100 comprises a tube-shaped body 1 and a spout 2 attached to the body 1.

[0012] The body 1 is a member for containing contents and is formed by a cylindrical sheet 41 having a pair of opposing, substantially parallel edges. The two ends of the sheet 41 can be joined together by a butting tape method, as shown in FIG. 2(a), in which the butted ends of the sheet 41 are sealed from the inside of the sheet 41 with a tape material 20, or by an envelope tape method, as shown in FIG. 2(b), in which the inner and outer surfaces of the sheet 41 are joined from the inside of the sheet 41 with a tape material 20. One end 5a (the lower end in FIG. 1) of the body 1 is sealed and closed. Meanwhile, the area near the other end 5b (the upper end in FIG. 1) of the body 1 is sealed to the outer surface 8 of the flange 4, described later, in a folded state. At the welded portion between the body 1 and the flange 4, a plurality of pleats 12 are formed by folding the sheet 41 that constitutes the body 1. The body 1 also has a joining portion 7 (a spine joining portion). The length of the body 1 in the vertical direction in FIG. 1 can be, for example, 50 to 250 mm.

[0013] As shown in FIG. 3, the sheet 41 constituting the body 1 of the tube container 100 is a multilayer sheet in which a base film layer 33, a barrier layer 34, and a sealant layer 35 are laminated in this order on one side of a paper layer 32, and a paper protective layer 37 is laminated on the other side of the paper layer 32.

[0014] (paper layer) The paper layer 32 is a structural layer that imparts strength and stiffness to the tube container 100. There are no particular limitations on the type of paper that constitutes the paper layer 32, but it is preferable to use single-gloss kraft paper or double-gloss kraft paper in terms of providing strength, flex resistance, and printability. Furthermore, the paper that constitutes the paper layer 32 may also be waterproof paper, oil-resistant paper, cup base paper, or the like, as needed.

[0015] The basis weight of the paper used for the paper layer 32 is 50 to 200 g / m 2 and 70 to 150 g / m 2 The basis weight of the paper used for the paper layer 32 is preferably 50 g / m 2 If the basis weight of the paper used for the paper layer 32 is less than 200 g / m, the stiffness of the body 1 will be insufficient. To compensate for this stiffness, for example, it is necessary to thicken the resin film provided inside the paper layer 32, but this leads to an increase in the resin ratio, which is undesirable in terms of reducing the environmental load. 2 If the cellulose fiber content exceeds 100%, the stiffness and heat insulating properties of the paper will deteriorate the ability to form tubes (bags), mold, and weld, and the manufacturing cost will increase, which is undesirable. In addition, the mass of cellulose fiber contained in the paper layer 32 is 50% or more of the total mass of the paper layer 32.

[0016] (Base film layer) The base film layer 33 is a layer that imparts heat resistance and physical strength such as toughness to the sheet 41. The base film layer 33 also serves as the base material for the barrier layer 34. The material of the film that constitutes the base film layer 33 is not particularly limited, but from the viewpoint of heat resistance and physical strength, it is preferable to use an oriented film of polypropylene, polyester, polyamide, or the like. Specifically, for example, GL-RD (manufactured by Toppan Printing Co., Ltd.) can be used. Furthermore, a paper layer may be provided instead of the base film layer 33.

[0017] (barrier layer) The barrier layer 34 is a functional layer that blocks oxygen, water vapor, and the like, thereby improving the shelf life of the contents. The barrier layer 34 can be composed of one or more of the following: a vapor-deposited film of an inorganic compound such as silica or alumina; a vapor-deposited film of a metal such as aluminum; a metal foil such as aluminum; a plate-like mineral; and / or a coating film of a barrier coating agent containing a barrier resin. Examples of the barrier resin used in the barrier coating agent include ethylene-vinyl alcohol copolymer (EVOH) and polyvinylidene chloride (PVDC), and the barrier coating agent appropriately contains a binder resin other than the barrier resin. The barrier layer 34 may be laminated in advance on a substrate such as the substrate film layer 33 to form a barrier film, or may be provided as a single layer. Specifically, for example, ONBC (manufactured by Unitika Ltd.) can be used.

[0018] (sealant layer) The sealant layer 35 is a layer provided for welding the tape material 20 to the barrel 1 at the bonding portion 7 and for welding the spout portion 2 to the barrel 1. The material of the sealant layer 35 is not particularly limited, but a thermoplastic resin such as polypropylene, polyethylene, cyclic polyolefin, or polyester is preferred. The sealant layer 35 is made of a resin whose softening temperature is at least 20°C lower than that of the base film layer 33. If the softening temperature of the sealant layer 35 is not at least 20°C lower than that of the base film layer 33, the base film layer 33 may soften during sealing, increasing the likelihood of pinholes forming, which is undesirable. The softening temperature of the sealant layer 35 is preferably at least 40°C lower than that of the base film layer 33.

[0019] The thermoplastic resin used for sealant layer 35 may be any resin that has adhesive properties to the thermoplastic resin that constitutes the material of spout 2, which will be described later, but is preferably the same material as the thermoplastic resin used for spout 2. By using the same thermoplastic resin for sealant layer 35 as the thermoplastic resin layer used for spout 2, the seal strength between barrel 1 and spout 2 can be improved.

[0020] (Paper protective layer) The paper protective layer 37 is a layer that protects the paper layer 32 that constitutes the sheet 41 from adhesion of contents and dirt. The material and method of forming the paper protective layer 37 are not particularly limited, but the paper protective layer 37 can be laminated by extrusion coating of a thermoplastic resin or by coating with a coating agent such as a water-resistant or oil-resistant agent. The thickness of the paper protective layer 37 is preferably 0.2 to 50 μm, and more preferably 0.5 to 20 μm. If the thickness of the paper protective layer 37 is less than 0.2 μm, pinholes may occur in the paper protective layer 37, and the paper layer 32 may not be sufficiently protected. Furthermore, if the thickness of the paper protective layer 37 exceeds 50 μm, this is undesirable in terms of the amount of resin used and manufacturing costs.

[0021] The thickness (total thickness) of the sheet 41 that constitutes the body portion 1 is not particularly limited, but is preferably 30 to 300 μm. If the thickness of the film that constitutes the body portion 1 is within this range, the body portion 1 can be easily processed into a tubular shape using a bag-making machine, pillow stick packaging machine, or the like. In addition, the use of the paper layer 32 provides strength and stiffness, allowing the body portion 1 to be thinner than a typical laminated tube (thickness 300 to 500 μm), and the amount of resin used can also be reduced.

[0022] In order to reduce the resin ratio of the sheet 41 that constitutes the body 1, it is preferable that the paper layer 32 account for 50% or more of the mass of the sheet 41. From the viewpoint of reducing the amount of resin used, the higher the ratio of the paper layer 32, the better.

[0023] The sheet 41 constituting the body 1 only needs to have two layers, the barrier layer 34 and the sealant layer 35, and the paper layer 32, the base film layer 33, and the paper protective layer 37 may be omitted. An ink layer may be provided between the paper layer 32 and the paper protective layer 37. The order of lamination of the paper protective layer 37 and the ink layer may be reversed, in which case an overcoat varnish layer may be laminated on the ink layer to impart abrasion resistance, etc. Furthermore, an adhesive may be used between the layers to bond the layers together.

[0024] 4 to 6, the joining of both ends of sheet 41 using tape material 20 will be described. Figures 4 and 5 are diagrams illustrating the state before the tape material is attached to the body part, and Figure 6 is a diagram illustrating the state after the tape material has been attached to the body part.

[0025] The tape material 20 includes a first resin layer 21, a second resin layer 22, and a substrate 23. The body 1 can be formed by welding the tape material 20 to the sealant layer 35 so as to include a pair of edges of the sheet 41 and / or the vicinity thereof. The substrate 23 has a strip shape, and one surface of the substrate 23 is covered with the first resin layer 21, and the other surface is covered with the second resin layer 22. When the tape material 20 is welded to the body 1, the first resin layer 21 is laminated on the side of the substrate 23 facing the body 1, and the second resin layer 22 is laminated on the side opposite the body 1.

[0026] The first resin layer 21 is a layer that can be welded to the sealant layer 35 of the body portion 1, and the thickness of the first resin layer 21 before welding is 10 μm or more and 70 μm or less, and more preferably 30 μm or more and 50 μm or less. The material of the first resin layer 21 is not particularly limited as long as it can be welded to the sealant layer 35 of the body portion 1, and for example, thermoplastic resins such as polypropylene, polyethylene, cyclic polyolefin, and polyester can be used. In particular, it is preferable that the material is the same as the thermoplastic resin used for the sealant layer 35. By using the same thermoplastic resin for the first resin layer 21 and the thermoplastic resin layer used for the sealant layer 35, the seal strength between the body portion 1 and the tape material 20 can be improved.

[0027] The thickness of the second resin layer 22 before welding is 10 μm or more and 70 μm or less, and more preferably 30 μm or more and 50 μm or less. The material of the second resin layer 22 can be, for example, a thermoplastic resin such as polypropylene, polyethylene, cyclic polyolefin, or polyester. In particular, it is preferable that the material is the same as the thermoplastic resin used for the first resin layer 21.

[0028] The substrate 23 is a functional layer having barrier properties and light-blocking properties, and can be appropriately selected from, for example, a stretched film such as polypropylene, a metal vapor-deposited film such as aluminum, or a metal foil such as aluminum, depending on the desired function. The substrate 23 may be a single layer or a multilayer, and the thickness of the substrate 23 is, for example, 9 to 40 μm. When a transparent barrier film is used as the substrate 23, for example, GL-RD, GL-ARH, GL-AE, GL-AN, or GX (manufactured by Toppan Printing Co., Ltd.) can be appropriately selected and used.

[0029] The tape material 20 and the sheet 41 are heat-sealed using a seal bar. The seal bar is wider than the tape material 20; that is, it has a heating section that can heat the tape material 20 so as to cover it. Therefore, even in the tape material 20 shown in FIG. 4, in which the base material 23 is exposed from the end surface, after welding, as shown in FIG. 5, the end surface of the tape material 20 is covered (protected) by the resin of the first resin layer 21 or the second resin layer 22 that melted during welding. This prevents the adhesive between the layers from leaching from the end of the tape material into the tube container, thereby preventing deterioration in the taste and color of the contents of the tube container 100. Furthermore, it also prevents delamination of the tape material 20.

[0030] As shown in FIG. 6, the end faces of the tape 20 may be covered with an end face resin 24 before welding. Even in this case, the thickness of the first resin layer 21 before welding is preferably 10 μm to 70 μm, more preferably 30 μm to 50 μm, and the thickness of the second resin layer 22 is preferably 10 μm to 70 μm, more preferably 30 μm to 50 μm. In this case, the seal bar used for welding may be narrower than the tape 20. Even when a narrow seal bar is used, the end faces of the tape 20 are already covered with the end face resin 24, so that the end faces of the tape 20 are covered (protected) even after welding, as shown in FIG. 5. The tape 20 shown in FIG. 6 can be produced, for example, by ultrasonic slitting. In this case, the end face resin 24 is made of the same material as the first resin layer 21 or the second resin layer 22.

[0031] FIG. 7 is a perspective view of the spout shown in FIG. 1 , and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7 . Spout 2 is a spout for extracting the contents contained in body 1 to the outside, and includes a cylindrical spouting tube portion 3 and a flange portion 4. Flange portion 4 is connected to one end 6 a (the lower end in FIG. 1 ) of spouting tube portion 3 and is a flat portion extending outward from spouting tube portion 3. In this embodiment, flange portion 4 is formed so as to extend in a direction perpendicular to the axial direction of spouting tube portion 3 (the left-right direction in FIG. 1 ). In this embodiment, flange portion 4 is formed in an annular shape; however, the shape of flange portion 4 is not limited as long as it can join body 1, and may be elliptical, oval, track-shaped, polygonal, or the like.

[0032] The spout 2 may be molded from a thermoplastic resin, or from a material containing a thermoplastic resin and a filler other than resin. Examples of the thermoplastic resin used for the spout 2 include polyethylene, polypropylene, polyester, polyamide, and cyclopolyolefin, either alone or in combination. Examples of the filler used for the spout 2 include talc, kaolin, paper powder, and cellulose fiber, either alone or in combination. Using a mixture of a thermoplastic resin and a filler other than resin for the spout 2 reduces the amount of resin used while maintaining moldability and thermal adhesion to the sheet material of the body 1. The method for molding the spout 2 is not particularly limited, and existing molding methods such as injection molding, thermoforming (e.g., vacuum forming or hot plate compression molding), and compression molding can be used.

[0033] As shown in Figures 7 and 8, annular convex portions 9 and concave portions 10 are provided on the outer surface 8 of the flange portion 4 (the surface on the side of the end portion 6b of the tubular pouring portion 3). When the body portion 1 is welded to the flange portion 4 of the spout portion 2, the convex portions 9 melt first, and the molten resin spreads between the inner surface of the body portion 1 and the flange portion 4. Some of the molten resin also flows into the concave portions 10. As a result, the inner surface of the body portion 1 and the outer surface 8 of the flange portion 4 can be welded together at their surfaces via the molten resin of the convex portions 9, thereby improving the weld strength.

[0034] When manufacturing the tube container 100, methods for welding the body 1 and the spout 2 can be ultrasonic welding, high frequency welding, heat seal welding, hot air welding, compression molding of the body insert, etc., but ultrasonic welding is used because it is not easily affected by the heat insulating properties of the paper. It is preferable to use

[0035] 1, the tube container 100 may further include a screw cap 11 that can be attached and detached by screwing onto the cylindrical pouring portion 3 of the pouring outlet portion 2. When the tube container 100 includes the screw cap 11, it becomes easy to reseal the tube container 100 after opening it.

[0036] The tube container 100 may also be provided with a hinge cap instead of the screw cap 11. When a hinge cap is provided, the hinge cap may be attached to the spout 2 by screwing onto the cylindrical pouring portion 3 shown in Fig. 1. Alternatively, a rib may be provided on the outer surface of the cylindrical pouring portion 3 instead of a thread, and the hinge cap may be attached to the spout 2 by fitting via the rib.

[0037] Moreover, the tube container 100 may be provided with a cap, instead of the screw cap 11, that fits onto the cylindrical pouring portion 3 by tapping.

[0038] Furthermore, the end 6b of the cylindrical pouring portion 3 may be sealed with a film that closes the cylindrical pouring portion 3 when the tube container 100 is in an unopened state.

[0039] Furthermore, the interior of the cylindrical pouring portion 3 may be closed by a partition to keep the interior of the tube container 100 sealed when the tube container 100 is unopened. When a partition is provided, it is preferable to provide a circular half-cut along the inner periphery of the cylindrical pouring portion 3 and to provide a pull ring connected to the portion surrounded by the half-cut. With this configuration, when opening the tube container 100, the user can pull the pull ring to break the half-cut portion of the partition, thereby removing the portion of the partition surrounded by the half-cut and forming an opening for pouring the contents from the body 1 into the cylindrical pouring portion 3.

[0040] As described above, in the tube container 100 of this embodiment, the end face of the tape material 20 attached to the body 1 is covered with the resin of the first resin layer 21 or the second resin layer 22 that melts when the tape material 20 is welded. Therefore, even if the tape material has a multi-layer structure, it is possible to prevent the adhesive between the layers from eluting from the end of the tape material, and also to prevent the tape material from peeling off from between the layers.

[0041] Furthermore, the base material 23 of the tape material 20 has a barrier property, which improves the barrier property of the joint portion of the sheet 41 of the tube container 100.

[0042] Furthermore, before welding, the thicknesses of the first resin layer 21 and the second resin layer 22 of the tape material 20 are both 10 μm or more and 70 μm or less, and the tape material 20 is welded using a seal bar that is wider than the tape material 20. Therefore, the end face of the tape material 20 can be covered (protected) by the resin of the first resin layer 21 or the second resin layer 22 that melts during welding.

[0043] Furthermore, the end faces of the tape material 20 may be covered with the end face resin 24 before welding. This allows the end faces of the tape material 20 to be covered with the resin of the first resin layer 21 or the second resin layer 22 that melts when the tape material 20 is welded, even when welding is performed using a seal bar that is narrower than the tape material 20. [Example]

[0044] Examples of specific implementations of the present invention will be described below.

[0045] (sheet production) Sheets A to E were produced. The specific production method will be explained below.

[0046] Basis weight 70g / m 2 A 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd.), and a 50 μm thick polyethylene were bonded in this order onto unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) by dry lamination using a two-component curing urethane adhesive. Sheet A for forming the body was produced by laminating the 15 μm thick polyethylene onto the unbleached kraft paper.

[0047] Basis weight 70g / m 2 Sheet B for forming the body was produced by dry laminating a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd.), and a 50 μm thick polyethylene film, in that order, onto unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) using a two-component curing urethane adhesive.

[0048] Basis weight 120g / m 2 Sheet C for forming the body was produced by dry laminating a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd.), and a 50 μm thick polyethylene in this order onto unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) using a two-component curing urethane adhesive.

[0049] Basis weight 70g / m 2Sheet D for forming the body was produced by dry laminating a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), a 9 μm thick aluminum foil (manufactured by Toyo Aluminum K.K.), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd.), and a 50 μm thick polyethylene in this order onto unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) using a two-component curing urethane adhesive.

[0050] Sheet E for forming the body was produced by dry laminating a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd.), and a 100 μm thick polyethylene in this order using a two-component curing urethane adhesive.

[0051] The compositions of the sheets A to E produced are shown in Table 1. The numerical values ​​in the body composition column in Table 1 are the basis weights of the paper (g / m 2 ) or layer thickness (μm).

[0052] [Table 1]

[0053] Example 1 A 30 μm thick polyethylene film, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and a 30 μm thick polyethylene (PE) film were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the edge.

[0054] For each of sheets A to E, the prepared tape material was welded to the inner surface of the sheet at the butted ends where both ends of the sheet were butted together using a seal bar wider (12 mm wide) than the tape material, to create five different body sections with a diameter of 35 mm and a length of 180 mm.

[0055] The spout was made of polyethylene resin by injection molding, and the cap was made of polypropylene resin by injection molding.

[0056] Five tube containers with an inner diameter of 35 mm were produced by heat welding a spout to each of the five body sections produced using a dedicated processing device.

[0057] Example 2 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a tape material with the substrate exposed from the end surface was produced by laminating, in this order, 50 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 50 μm thick polyethylene.

[0058] Example 3 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 30 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and a 70 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0059] Example 4 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 70 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and a 30 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0060] Example 5 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 10 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 10 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0061] Example 6 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 30 μm thick ionomer, a 9 μm thick aluminum foil (manufactured by Toyo Aluminum Co., Ltd.), and a 40 μm thick ionomer were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0062] Example 7 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 70 μm thick ionomer, a 9 μm thick aluminum foil (manufactured by Toyo Aluminum Co., Ltd.), and another 70 μm thick ionomer were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0063] Example 8 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 30 μm thick polyethylene, a 25 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 30 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0064] Example 9 A 30 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 30 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material whose end surface was covered with the substrate by ultrasonic slitting. The produced tape material was welded to each of Sheets A to E using a seal bar narrower than the tape material to produce five different body sections each measuring 35 mm in diameter and 180 mm in length. Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1.

[0065] Example 10 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that 40 μm thick polyethylene, 40 μm thick stretched polypropylene, and 40 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0066] (Comparative Example 1) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that 9 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and 9 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0067] (Comparative Example 2) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that 7 μm thick polyethylene, 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and 7 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0068] (Comparative Example 3) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that 4 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and 70 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0069] Comparative Example 4 Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a tape material with a width of 8 mm was produced from polyethylene with a thickness of 100 μm.

[0070] (Comparative Example 5) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 30 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 30 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0071] (Comparative Example 6) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that the body portion was produced by palm-to-palm welding, in which the inner surfaces of the band-shaped portions including each of the pair of end edges of the produced sheets A to E were butted together in a palm-to-palm manner and welded together.

[0072] (Comparative Example 7) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that a 70 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and an 80 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0073] (Comparative Example 8) Five tube containers with an inner diameter of 35 mm were produced in the same manner as in Example 1, except that an 80 μm thick polyethylene, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd.), and another 80 μm thick polyethylene were laminated in this order to produce an 8 mm wide tape material with the substrate exposed from the end surface.

[0074] The tube containers produced in Examples 1 to 10 and Comparative Examples 1 to 8 were each evaluated for end face protection, formability, handleability, and chemical resistance.

[0075] The edge protection evaluation was performed by observing the edge of the tape under a microscope. If the substrate was not exposed at the edge of the tape, it was evaluated as having edge protection (○ in Table 1), and if the substrate was exposed, it was evaluated as not having edge protection (× in Table 1).

[0076] The moldability was evaluated as good (○ in Table 1) when a tube container could be produced without any problems, fair (△ in Table 1) when it was somewhat difficult to produce but the tube container could be produced with almost no problems, and poor (× in Table 1) when it was difficult or impossible to produce a tube container.

[0077] For the handling evaluation, 20 monitors were interviewed about the usability during actual use. If 15 or more people answered that the usability was good, the handling was evaluated as good (○ in Table 1), and if 14 or fewer people answered that the usability was good, the handling was evaluated as bad (× in Table 1).

[0078] To evaluate chemical resistance, each of the prepared tube containers was filled with 50% ethanol and stored for one month at a room temperature of 40°C and a humidity of 75%, after which the presence or absence of delamination of the tape material was checked. If there was no delamination, the chemical resistance was evaluated as good (○ in Table 1), and if there was delamination, the chemical resistance was evaluated as poor (× in Table 1).

[0079] In the evaluation of the presence or absence of surface protection, the evaluation of moldability, the evaluation of handleability, and the evaluation of chemical resistance, if there was no "x" in the evaluation results, it was evaluated as "○", and if there was an "x" in the evaluation results in any of them, it was evaluated as "x".

[0080] Table 2 shows the tape structure for each example and comparative example, the width of the seal bar relative to the width of the tape, the presence or absence of end-face resin on the end face of the tape before welding, the results of each evaluation, and the results of the overall evaluation. The numerical values ​​in the tape structure column in Table 2 indicate the layer thickness (μm).

[0081] [Table 2]

[0082] In the tube containers of Examples 1 to 8 and 10, the substrate was exposed from the end face of the tape material 20 before welding. However, before welding, the thicknesses of the first resin layer 21 and the second resin layer 22 of the tape material 20 were both 10 μm or more and 70 μm or less, and the tape material 20 was welded using a sealing bar wider than the tape material 20. Therefore, the end face of the substrate 23 was protected by the resin of the first resin layer 21 or the second resin layer 22 that melted during welding.

[0083] In the tube container of Example 5, the thicknesses of the first resin layer 21 and the second resin layer 22 of the tape material were both relatively thin at 10 μm, so the amount of resin covering the end surface of the base material was small, but the tube container could be produced with almost no problems.

[0084] In the tape material of the tube container in Examples 6 and 7, the first resin layer 21 and the second resin layer 22 were ionomer and the base material 23 was aluminum foil, so that the tape material was able to be endowed with light-blocking properties in addition to barrier properties.

[0085] Furthermore, in the tube container of Example 9, before welding, the thicknesses of the first resin layer 21 and the second resin layer 22 of the tape material 20 were both 10 μm or more and 70 μm or less, and the end faces of the base material 23 were covered with the end face resin 24, so even when the tape material 20 was welded using a seal bar narrower than the tape material 20, the end faces of the base material 23 were protected.

[0086] In the tape material of the tube container according to Comparative Example 1, the thickness of both the first resin layer and the second resin layer was as thin as 9 μm, so the end face of the substrate was difficult to cover, the chemical resistance was low, and poor welding to the body was also likely to occur.

[0087] In the tape material of the tube container according to Comparative Example 2, the thickness of both the first resin layer and the second resin layer was as thin as 7 μm, so the end faces of the substrate were not covered, the chemical resistance was low, and poor welding to the body was also likely to occur.

[0088] In the tape material of the tube container according to Comparative Example 3, the first resin layer was thin at 4 μm, which sometimes made it impossible to form the first resin layer and made welding to the body difficult. However, the second resin layer was thick at 70 μm, so the end face of the substrate 23 was protected.

[0089] The tape material of the tube container according to Comparative Example 4 was a single layer of polyethylene. Therefore, the tape material did not have the stretching margin inherent in the stretchable base material, making it difficult to stably produce tube container bags.

[0090] The tape material of the tube container in Comparative Example 5 had the base material exposed from the end face of the tape material before welding, but the tape material was welded using a seal bar that was narrower than the tape material, so the end face of the base material was not covered and the chemical resistance was low.

[0091] The tube container of Comparative Example 6 had a body made by seaming, so the seam seal protruding from the body came into contact with the hand during use, making it difficult to handle. In addition, the seam seal was stiff, making it difficult to produce a bag for the tube container.

[0092] The tape material of the tube container according to Comparative Example 7 had a thick first resin layer of 80 μm, which increased the thickness of the tape material itself, making it difficult to apply end seals to the body portion during bag production.

[0093] The tape material of the tube container in Comparative Example 8 had a thick first resin layer and a thick second resin layer, both of which were 80 μm thick, which increased the thickness of the tape material itself and made it difficult to apply the end seal to the body part during bag production. [Industrial Applicability]

[0094] The tube container according to the present invention can be used as a packaging material for medicines, cosmetics, food, etc. [Explanation of symbols]

[0095] 1. Torso 2 Spout part 7. Bonding section 20 Tape material 21 First resin layer 22 Second resin layer 23 Base material 24 Edge resin 32 Paper layer 33 Base film layer 35 Sealant Layer 41 seats 100 tube containers

Claims

[Claim 1] A sheet having a pair of opposing edges is formed into a cylindrical shape, and the pair of edges on the inner surface of the sheet are A method for manufacturing a tube container having a body portion with tape attached to portions along each edge thereof and a spout portion attached to one end of the body portion, comprising: The tape material is a strip-shaped substrate having barrier properties; a first resin layered on the body side of the substrate; a second resin layer laminated on the substrate on the opposite side of the trunk portion; the first resin layer is 10 μm or more and 70 μm or less; the second resin layer is 10 μm or more and 70 μm or less; an end surface of the tape material is coated with the same resin as the first resin or the second resin; A method for manufacturing a tube container, wherein the tape material and the body portion are heat-sealed with a seal bar that is narrower than the tape material.

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