Tube container

Abstract

To provide a tube container in which a surface of a trunk part is paper and which is excellent in decoration.SOLUTION: A tube container comprises: a spout port part which has a tubular spout cylinder part, and a flange part connected with one end of the spout cylinder part and extended to the outer side of the spout cylinder part; and a tubular trunk part which consists of a sheet having sealant on one face side of paper, and in which one end is closed, and a portion of a prescribed range from the other end is sealed in the flange part. In the trunk part, a back-lining seal part is formed by butting and sealing the sheet rounded in a cylindrical shape in two-folded forms. The back-lining seal part is bent along an outer face of the trunk part to be sealed in the trunk part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a tube container. [Background technology]

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

[0003] [Patent Document 1] Japanese Patent Publication No. 2016-199280 [Overview of the project] [Problems that the invention aims to solve]

[0004] In recent years, there has been a demand to reduce the amount of resin used in packaging containers from the perspective of reducing environmental impact and conserving resources, and various packaging containers that replace some of the resin with paper are being considered. In the case of tube containers as well, in order to reduce the amount of resin used, for example, paper could be used for the body of the container.

[0005] Tube containers are generally used for packaging liquids, so to prevent liquid from seeping into the paper, if paper is used for the sheet that makes up the body, it is necessary to provide a resin layer on one side of the paper (the side that will be the inside of the body). It is also necessary to prevent liquid from seeping in from the edges of the sheet. One method is to form a tube with sheets of different materials on the front and back (for example, polyethylene for the innermost layer and paper for the outermost layer), partially overlap them, and then use tape material to bond the innermost and outermost layers at the overlapping part. However, this method requires tape material, which increases manufacturing costs, and there is a possibility that adhesive components may leach out from the exposed edges of the tape material inside, so it is not a desirable structure for tube containers. The body needs to be structured so that the edges of the sheet do not come into contact with the contents, and a form in which the inner surfaces of the sheets are butted together in a gusset shape and sealed at the back, like a pillow packaging bag, is suitable.

[0006] However, when two sheets containing paper are layered and sealed at the back, the stiffness of the back seal area causes it to spring up from the body, damaging the appearance of the packaging container.

[0007] Therefore, the present invention aims to provide a highly aesthetic tube container in which paper is used on the surface of the body. [Means for solving the problem]

[0008] The tube container according to the present invention comprises a cylindrical dispensing cylinder portion, a dispensing outlet portion having a flange portion connected to one end of the dispensing cylinder portion and extending outward from the dispensing cylinder portion, and a tubular body portion made of a sheet having sealant on one side of the paper, with one end closed and a predetermined range portion from the other end sealed to the flange portion, and a back-sealed portion formed on the body portion by butting together rolled-up cylindrical sheets in a gable shape and sealing, and an overlapping portion of the sheets is formed by folding at least a portion of the predetermined range portion of the body portion. The sheet material for the body has a basis weight of 30-200 g / m². 2 On one side of the paper, a base film having a barrier layer and a sealant are laminated in this order.Among the other surfaces of the body sheet, when the back sticker sealing part is bent along the body, a coating agent having heat weldability is partially applied to the part where the outer surface of the back sticker sealing part contacts the outer surface of the body and the part within a predetermined range sealed to the flange part. The application amount of the heat-weldable coating agent is 0.2 to 40 g / m². 2 The total thickness of the sheet in the torso is 30-300 μm. The back sticker sealing part is bent along the outer surface of the body and sealed to the body through the coating agent, and the overlapping sheets are sealed to each other through the coating agent at the overlapping part.

Effect of the Invention

[0009] According to the present invention, it is possible to provide a highly cosmetic tube container using paper on the surface of the body.

Brief Description of the Drawings

[0010] [Figure 1] Perspective view showing the schematic configuration of the tube container according to the embodiment [Figure 2] Cross-sectional view taken along line II-II shown in FIG. 1 [Figure 3] End view taken along line III-III shown in FIG. 1 [Figure 4] End view taken along line IV-IV shown in FIG. 1 [Figure 5] Cross-sectional view showing an example of the layer configuration of the sheet constituting the body of the tube container [Figure 6] Plan view of the sheet constituting the body of the tube container [Figure 7A] Cross-sectional view for explaining the manufacturing method of the body of the tube container [Figure 7B] Cross-sectional view for explaining the manufacturing method of the body of the tube container [Figure 7C] Cross-sectional view for explaining the manufacturing method of the body of the tube container [Figure 7D] Cross-sectional view for explaining the manufacturing method of the body of the tube container [Figure 8A] View for explaining the welding method of the body and the pouring outlet part of the tube container [Figure 8B]A diagram for explaining a method of welding the body portion and the spout portion of a tube container [Figure 8C] A diagram for explaining a method of welding the body portion and the spout portion of a tube container

Embodiments for Carrying Out the Invention

[0011] FIG. 1 is a perspective view showing a schematic configuration of a tube container according to an embodiment, FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. 1, FIG. 3 is an end view taken along line III-III shown in FIG. 1, and FIG. 4 is an end view taken along line IV-IV shown in FIG. 1.

[0012] The tube container 100 includes a tubular body portion 1 and a spout portion 2 attached to the body portion 1.

[0013] The body portion 1 is a member for accommodating the content, and is formed of a sheet including paper and a sealant. The body portion 1 is formed by rounding a sheet having a pair of substantially parallel edges and welding the inner surfaces of the belt-like portions including the respective pair of edges of the sheet in a palm-like butting manner. The body portion 1 can be produced using a bag-making machine, a pillow-stick packaging machine, or the like.

[0014] The spout portion 2 is a spout for extracting the content accommodated in the body portion 1 to the outside, and is molded from a material including a thermoplastic resin. The spout portion 2 includes a spout cylinder portion 3 and a flange portion 4. The flange portion 4 is connected to one end portion 6a (the lower end in FIG. 2) of the spout cylinder portion 3 and is a flat plate-like portion extending outward of the spout cylinder portion 3. In the present embodiment, the flange portion 4 is formed so as to extend in a direction orthogonal to the axial direction of the spout cylinder portion 3 (the left-right direction in FIG. 2). In the present embodiment, the flange portion 4 is formed in an annular shape, but the outer shape of the flange portion 4 is not limited as long as the body portion 1 can be joined, and may be an elliptical shape, an oval shape, a track shape, a polygonal shape, or the like.

[0015] The thermoplastic resin used for the spout section 2 can be, for example, one of polyethylene, polypropylene, polyester, polyamide, and cyclopolyolefin, or a combination of two or more of these. The spout section 2 may also be molded from a material containing a thermoplastic resin and a filler other than resin. The filler can be one of talc, kaolin, paper powder, and cellulose fiber, or a combination of two or more of these. By using a mixture of thermoplastic resin and a filler other than resin as the material for the spout section 2, it is possible to reduce the amount of resin used while maintaining moldability and heat-welding properties with the sheet material of the body section 1. The molding method for the spout section 2 is not particularly limited, but existing molding methods such as injection molding, thermoforming such as vacuum forming and hot plate pressure forming, and compression molding can be used.

[0016] As shown in Figures 1 and 2, one end 5a of the body portion 1 is sealed and closed. On the other hand, a predetermined range from the other end 5b of the body portion 1 is folded and sealed to the outer surface 8 of the flange portion 4 of the spout portion 2. As shown in Figures 1 and 4, a plurality of pleats 12 are formed on the flange portion 4 by folding the sheet that makes up the body portion 1.

[0017] A back-sealed portion 7 is formed on the body portion 1 by butting the inner surfaces of the sheets together in a girdle shape and welding them together. As shown in Figure 3, the back-sealed portion 7 formed on the body portion 1 is folded along the outer surface of the body portion 1 and sealed to the body portion 1. The outer surface of the back-sealed portion 7 and the outer surface of the body portion 1 are sealed using a heat-sealable material.

[0018] Furthermore, as shown in Figure 4, an overlapping portion 13 of sheets is formed on the flange portion 4 of the spout portion 2 by folding at least a portion of a predetermined range from the end 5b of the body portion 1. In the overlapping portion 13, the outer surfaces of the overlapping sheets are in contact with each other, and the outer surfaces of the contacting sheets are sealed using a heat-weldable material.

[0019] Figure 5 is a cross-sectional view showing an example of the layered structure of the sheets that make up the body of a tube container.

[0020] The body 1 of the tube container 100 is made of a sheet 41 mainly composed of paper. The sheet 41 is a multilayer sheet in which a base film layer 33, a barrier layer 34, and a sealant layer 35 are laminated in that order on one side of a paper layer 32, a paper protective layer 37 is laminated on the other side of the paper layer 32, an ink layer 38 and an overcoat varnish layer 39 are laminated on the paper protective layer 37, and a heat-weldable coating layer 40 is pattern-coated. Details of each layer will be described below.

[0021] (paper layer) The paper layer 32 is a structural layer that provides strength and rigidity to the tube container 100. The type of paper that makes up the paper layer 32 is not particularly limited, but it is preferable to use single-sided glossy kraft paper or double-sided glossy kraft paper in terms of strength, bending resistance, and printability. In addition, water-resistant paper or oil-resistant paper may be used as the paper that makes up the paper layer 32 as needed. Furthermore, the paper layer 32 may be any paper that contains 50% or more pulp fibers, and may be a mixed paper that contains resin fibers in addition to pulp fibers.

[0022] The basis weight of the paper used for the paper layer 32 is 30-200 g / m². 2 It is 50-120 g / m² 2 It is preferable that the basis weight of the paper used for the paper layer 32 be 30 g / m². 2 If the value is less than 200 g / m², the stiffness of the body 1 will be insufficient. To compensate for the lack of stiffness, for example, it would be necessary to increase the thickness of the resin film placed inside the paper layer 32, but this would lead to an increase in the resin ratio, which is undesirable in terms of reducing environmental impact. Also, the basis weight of the paper used for the paper layer 32 is 200 g / m². 2 If the value exceeds this, the stiffness and heat insulation properties of the paper will worsen the tubular (bag-making) properties, moldability, and weldability, and the manufacturing costs will also increase, which is undesirable.

[0023] (Base film layer) The base film layer 33 is a layer that imparts heat resistance and physical strength to the sheet 41. The base film layer 33 also serves as the base layer for the barrier layer 34. The material of the film constituting the base film layer 33 is not particularly limited, but from the viewpoint of heat resistance and physical strength, it is preferable to use a stretched film such as polypropylene, polyester, or polyamide. However, the base film layer 33 may also be made of paper.

[0024] (Barrier layer) The barrier layer 34 is a functional layer that blocks oxygen, water vapor, etc., to improve the preservation 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. As the barrier resin used in the barrier coating agent, ethylene-vinyl alcohol copolymer (EVOH) or polyvinylidene chloride (PVDC) can be used, and a binder resin other than the barrier resin may be appropriately blended into the barrier coating agent. The barrier layer 34 may be pre-laminated on the base film layer 33 to form a barrier film, or it may be provided as a single layer film.

[0025] (Sealant layer) The material of the sealant layer 35 is not particularly limited, but it is preferably a thermoplastic resin such as polypropylene, polyethylene, cyclic polyolefin, or polyester. The sealant layer 35 uses a resin whose softening temperature is 20°C or more lower than the softening temperature of the base film layer 33. If the softening temperature of the sealant layer 35 is not 20°C or more lower than the softening temperature of the base film layer 33, it is undesirable because the base film layer 33 will soften during sealing, increasing the likelihood of pinholes occurring. Preferably, the softening temperature of the sealant layer 35 is 40°C or more lower than the softening temperature of the base film layer 33.

[0026] The thermoplastic resin used in the sealant layer 35 can be any material that adheres to the thermoplastic resin that makes up the material of the spout section 2, which will be described later, but it is preferable that it be the same material as the thermoplastic resin used in the spout section 2. By using the same thermoplastic resin for the sealant layer 35 and the thermoplastic resin layer used in the spout section 2, the seal strength between the body section 1 and the spout section 2 can be improved.

[0027] (Paper protective layer) The paper protective layer 37 is a layer that protects the paper layer 32 constituting the sheet 41 from the adhesion of contents and dirt. The material and formation method of 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 agent or an oil-resistant agent. The thickness of the paper protective layer 37 is preferably 0.2 to 50 μm, and more preferably 1 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 protection of the paper layer 32 may be insufficient. Also, if the thickness of the paper protective layer 37 exceeds 50 μm, it is undesirable in terms of resin usage and manufacturing costs.

[0028] (Ink layer, overcoat varnish layer) The ink layer 38 is a layer applied by printing for various markings, and the overcoat varnish layer 39 is a layer for providing abrasion resistance, etc. The layering order of the ink layer 38 and the overcoat varnish layer may be reversed from that shown in Figure 4. Also, the overcoat varnish layer 39 may also serve as the paper protection layer 37.

[0029] (Heat-weldable coating layer) The heat-weldable coating layer 40 is a layer that provides heat-weldability to the outer surface of the sheet 41. In this embodiment, as will be described later, the heat-weldable coating layer 40, which is pattern-coated on the outer surface of the sheet 41, seals the outer surface of the back-sealed portion 7 to the outer surface of the body portion 1 (see Figure 3), and also seals the overlapping outer surfaces of the sheets at the overlapping portion 13 formed on the flange portion 4 of the spout portion 2 (see Figure 4).

[0030] The heat-sealable coating layer 40 can be formed by applying a coating agent containing a thermoplastic resin with a melting point of 200°C or lower, such as an acrylic polymer, a polyolefin, a polyvinyl acetate, or a polyester, and drying it. In addition to the thermoplastic resin, the coating agent may be blended with an inorganic substance or the like for preventing blocking.

[0031] The coating amount of the coating agent for forming the heat-sealable coating layer 40 is 0.2 to 40 g / m 2 and preferably 3.0 to 30 g / m 2 If the coating amount of the coating agent is less than 0.2 g / m 2 , the adhesive strength between the outer surfaces of the sheet 41 is insufficient, and a phenomenon (hereinafter referred to as "paper honey") in which the sheets at the back sticker seal portion 7 and the overlapping portion 13 jump up occurs. On the other hand, if the coating amount of the coating agent exceeds 40 g / m 2 , the coefficient of friction increases, and the mechanical suitability for processing equipment such as a bag-making machine decreases, or blocking between the sheets 41 is likely to occur.

[0032] The heat-sealable coating layer 40 may be provided on the entire surface of the sheet 41. However, since the coefficient of friction of the surface of the sheet 41 increases, the mechanical suitability in the process of processing the body portion 1 and subsequent processes may decrease. Therefore, it is more preferable in terms of mechanical suitability that the heat-sealable coating layer 40 is provided on a part of the surface of the sheet 41 by pattern coating (partial coating) of the coating agent.

[0033] When the heat-sealable coating layer 40 is provided on a part of the surface of the sheet 41, it is sufficient that the heat-sealable coating layer 40 is provided at the seal target portion, that is, the portion where the outer surface of the back sticker seal portion 7 contacts the outer surface of the body portion 1 and the portion where the outer surfaces of the overlapping sheets contact each other at the overlapping portion 13. However, the heat-sealable coating layer 40 may be provided on only one of the surfaces that contact each other at the seal target portion.

[0034] The thickness (total thickness) of the sheet 41 constituting the body 1 is not particularly limited, but is preferably 30 to 300 μm. If the thickness of the film constituting the body 1 is within this range, the body 1 can be easily processed into a cylindrical shape using a bag-making machine or a pillow / stick packaging machine. Furthermore, since the paper layer 32 provides strength and rigidity, it can be made thinner compared to a typical laminate tube (thickness 300 to 500 μm), and the amount of resin used can also be reduced.

[0035] In order to reduce the resin ratio of the sheet 41 that constitutes the body 1, it is preferable that the paper layer 32 accounts for 50% or more of the mass of the sheet 41. From the viewpoint of reducing the amount of resin used, a higher proportion of the paper layer 32 is preferable.

[0036] Furthermore, in the layer configuration of sheet 41 shown in Figure 5, one or more layers of the base film layer 33, barrier layer 34, paper protection layer 37, ink layer 38, and overcoat varnish layer 39 may be omitted.

[0037] As shown in Figure 1, the tube container 100 may further include a screw cap 11 that can be attached and detached by screwing it onto the dispensing cylinder portion 3 of the spout portion 2. When the tube container 100 is equipped with a screw cap 11, it is easy to reseal the tube container 100 after opening. Yes.

[0038] Furthermore, the tube container 100 may be equipped with a hinged cap instead of a screw cap 11. If a hinged cap is provided, the hinged cap may be attached to the spout portion 2 by screwing it onto the dispensing cylinder portion 3 shown in Figure 1. Alternatively, ribs may be provided on the outer surface of the dispensing cylinder portion 3 instead of screw threads, and the hinged cap may be attached to the spout portion 2 by fitting through the ribs.

[0039] Furthermore, a film may be sealed over the end 6b of the dispensing cylinder 3 to close the dispensing cylinder 3 when the tube container 100 is unopened.

[0040] Furthermore, the inside of the dispensing cylinder 3 may be sealed by a partition wall to maintain an airtight seal inside the tube container 100 when it is unopened. If a partition wall is provided, it is preferable to provide a circular half-cut along the inner circumference of the dispensing cylinder 3 and a pull ring connected to the portion enclosed by the half-cut. With this configuration, when opening the tube container 100, the user can pull the pull ring to break the portion of the partition wall at the half-cut 27, thereby removing a portion of the partition wall enclosed by the half-cut and forming an opening for dispensing the contents from the body 1 to the dispensing cylinder 3.

[0041] The manufacturing method for the tube container 100 according to this embodiment will be described below.

[0042] Figure 6 is a plan view of the sheet that makes up the body of the tube container.

[0043] The sheet 20 shown in Figure 6 is a sheet having the layered structure described in Figure 5, and corresponds to one body section 1. The area near the upper edge 24 in Figure 6 corresponds to the part that will be welded to the spout section 2, and the area near the lower edge in Figure 6 corresponds to the closed end. The central region 21 enclosed by the dashed lines is the front surface of the tube container 100, and the regions 22 adjacent to both sides of region 21 are the back surfaces of the tube container 100. The front side of the page in Figure 6 is the outer surface of the body section 1.

[0044] The heat-weldable coating layer described above is formed on the surface (outer surface) of the sheet 20 by pattern coating a heat-weldable coating agent onto a band-shaped region 25 along the edge 23a and a band-shaped region 26 including the edge 24 adjacent to the edge 23a. Region 25 corresponds to the part where the outer surface of the back-sealed portion 7 and the outer surface of the body 1 come into contact when the sheet 20 is rolled into a cylinder, the inner surfaces of the band-shaped regions along opposing parallel edges 23a and 23b are joined together in a gable shape to form the back-sealed portion 7, and the back-sealed portion 7 is folded to conform to the body 1. Region 26 corresponds to the part that is welded to the flange portion 4 when the tubular sheet 20 is joined to the flange portion 4 of the spout portion 2, and is folded to form the pleats 12.

[0045] Figures 7A to 7D are cross-sectional views illustrating the manufacturing method for the body of a tube container. In Figures 7A to 7D, the direction perpendicular to the plane of the paper is the conveying direction of the sheet 20, and the sheet 20 is sequentially processed while being conveyed by a conveying device (not shown).

[0046] First, as shown in Figure 7A, the sheet 20 is wrapped around a plate-shaped jig 51, and a predetermined area including one edge 23a and a predetermined area including the other edge 23b are overlapped. As explained in Figure 6, a heat-weldable coating layer is provided in the region 25 along the edge 23a.

[0047] Next, as shown in Figure 7B, using a guide 52 with an inverted T-shaped cross-section, the strip-shaped portion along edge 23a and the strip-shaped portion along edge 23b are raised, and their inner surfaces are brought to face each other in a gable-like manner with the guide 52 in between.

[0048] Next, as shown in Figure 7C, the flat guide 53 is used to fold the parts where the inner surfaces of the sheets 20 are joined together in a V-shape by approximately 90 degrees, so that the three sheets are stacked on top of each other.

[0049] In this state, as shown in Figure 7D, by sealing with the seal bar 54, the inner surfaces of the sheets 20 are welded together to form the back-sealed portion 7, and at the same time, the heat-weldable coating layer provided in region 25 welds the back-sealed portion 7 to the outer surface of the body 1, thereby forming the body 1.

[0050] Figures 8A to 8C illustrate the welding method between the body and spout of a tube container.

[0051] First, as shown in Figures 8A and 8B, a cylindrical body 1 and a separately molded spout 2 are prepared, and the flange 4 of the spout 2 is inserted from the end 5b of the body 1. It is preferable to screw a separately molded screw cap 11 onto the spout 2 to integrate it. As explained in Figure 6, a heat-weldable coating layer is provided in the region 26 including the edge 24.

[0052] Next, as shown in Figure 8B, the inner surface of the flange portion is supported using a jig 56 inserted from the other end of the body portion 1, and a predetermined portion from the edge 24 (end 5b) of the body portion 1 is folded back and held in place in the direction of the white arrow shown in Figure 8B using claws (not shown). Multiple claws for folding back the body portion 1 are provided at predetermined intervals around the circumferential direction of the spout portion 2.

[0053] Next, as shown in Figure 8C, a predetermined range of the body portion 1 from the edge 24 is clamped between a welding device 57 such as an ultrasonic horn and a jig 56. By pressing the predetermined range of the body portion 1 from the edge 24 with multiple intermittently arranged claws and applying pressure with the welding device 57, the predetermined range of the body portion 1 from the edge 24 can be folded and welded to the flange portion 4. This allows the body portion 1 and the spout portion 2 to be joined together.

[0054] Subsequently, by filling the body portion 1 with contents and closing the end of the body portion 1, a package using the tube container 100 can be obtained.

[0055] When manufacturing the tube container 100, methods such as ultrasonic welding, high-frequency welding, heat seal welding, hot air welding, and compression molding of the body insert can be used to weld the body portion 1 and the spout portion 2. However, ultrasonic welding is preferred because it is less affected by the heat insulation properties of the paper.

[0056] As described above, the tube container according to this embodiment is constructed with a body 1 made of a sheet containing paper and sealant. This reduces the amount of resin used, while the paper provides rigidity to the body 1, resulting in excellent self-standing ability and handling. The back seal portion 7 formed on the body 1 is welded to the outer surface of the body 1, and the overlapping portions 13 of the sheet formed on the flange portion 4 are welded to each other. As a result, there are no paper flakes on the back seal portion 7 and the overlapping portions 13, providing a tube container 100 with excellent aesthetic appeal.

[0057] Furthermore, in the tube container 100 according to this embodiment, the flange portion 4 has a flat plate shape perpendicular to the central axis of the dispensing cylinder portion 3, and the body portion 1 is welded to the outer surface 8 of the flange portion 4. Therefore, when the contents of the tube container 100 become low, the contents can be easily squeezed out by folding the body portion 1 along the outer edge of the flange portion 4. Also, since the flange portion 4 has a flat plate shape and does not form a space where contents remain, the contents can be squeezed out completely by bending the body portion 1 along the outer edge of the flange portion 4, making the flange portion 4 and the body portion 1 almost flat.

[0058] (modified version) In the above embodiment, an example was described in which the heat-weldable coating layer 40 was laminated on both regions 25 and 26 shown in Figure 6. However, if the number and area of ​​overlapping portions 13 can be reduced by the shape of the flange portion 4 and the way the welding portion of the body portion 1 to the flange portion 4 is folded, the heat-weldable coating layer 40 in region 26 (overlapping portion 13) may be omitted, and the heat-weldable coating layer 40 may be provided only in region 25. In this case as well, since the back-sealed portion 7 is folded and sealed along the outer surface of the body portion 1, a highly aesthetic tube container can be obtained in which paper flapping of the back-sealed portion 7 is prevented.

[0059] Furthermore, although the above embodiment describes an example in which a heat-weldable coating layer 40 is laminated by pattern coating of the coating agent, the heat-weldable coating layer 40 may also be formed by coating the entire surface of the sheet material constituting the body portion 1 with the coating agent.

[0060] Furthermore, in the above embodiment, an example was described in which the back-seal portion 7 and the overlapping portion 13 are welded by providing a heat-weldable coating layer 40. However, instead of laminating the heat-weldable coating layer 40, the paper protective layer 37 shown in Figure 6 may be formed on the entire surface of the paper layer 32 using a heat-weldable material, and the back-seal portion 7 may be welded to the outer surface of the body portion 1 by the paper protective layer 37. In addition to the back-seal portion 7, the overlapping sheets in the overlapping portion 13 on the flange portion 4 may also be welded together by the paper protective layer 37. When the paper protective layer 37 is formed from a heat-weldable material, a heat-weldable resin such as an acrylic polymer, polyolefin, polyvinyl acetate, or polyester may be extruded onto the paper layer 32, or a coating agent containing these thermoplastic resins and inorganic compounds added as needed may be coated onto the paper layer 32. When a heat-weldable paper protective layer 37 is formed by resin extrusion coating, the thickness is preferably 5 to 30 μm, and when a thermoplastic paper protective layer 37 is formed by a coating agent, the thickness is preferably 0.2 to 20 μm. [Examples]

[0061] The following describes specific examples of how the present invention is implemented.

[0062] (Example 1) Basis weight 100g / m 2 On unbleached kraft paper (manufactured by Oji Paper Co., Ltd.), a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product name: GL-RD) and a 50 μm thick linear low-melting-point polyethylene (LLDPE, manufactured by Tama Poly Chemical Co., Ltd., product name: SE620A) were bonded in this order using a two-component curing urethane adhesive via dry lamination. On the other surface of the paper, a layer was formed in the ink layer and overcoat by printing, and a heat-weldable coating agent containing thermoplastic resin was pattern-coated in the area where the back-sealed portion and the body portion overlap, and in the area where the body portion folds and overlaps when sealed to the flange portion of the dispensing outlet (hatched areas in Figure 6). The amount of heat-weldable coating agent applied was 10 g / m². 2 The sheet with a heat-sealable coating layer was processed using a back-sealing pouch-making machine to produce a back-sealed pouch (body) with a diameter of 35 mm and a length of 200 mm.

[0063] The spout was manufactured by injection molding polyethylene.

[0064] A 35mm diameter tube container was manufactured by heat-welding the fabricated body and spout using a specialized processing device.

[0065] (Example 2) The amount of heat-weldable coating agent to be applied is 1 g / m². 2 A 35 mm diameter tube container was prepared in the same manner as in Example 1, except for the aforementioned difference.

[0066] (Example 3) The amount of heat-weldable coating agent to apply is 20g / m². 2 A 35 mm diameter tube container was prepared in the same manner as in Example 1, except for the aforementioned difference.

[0067] (Example 4) A 35 mm diameter tube container was prepared in the same manner as in Example 1, except that a heat-sealable coating agent was applied to the entire surface of the sheet.

[0068] (Comparative Example 1) A 35 mm diameter tube container was prepared in the same manner as in Example 1, except that a heat-sealable coating agent was not applied.

[0069] (Comparative Example 2) The amount of heat-weldable coating agent to be applied is 0.1 g / m². 2 A 35 mm diameter tube container was prepared in the same manner as in Example 1, except for the aforementioned difference.

[0070] Table 1 shows the basis weight of the paper, the amount and method of application of the heat-sealable coating agent for each example and comparative example, along with the evaluation results for bag-making suitability (machine suitability), stiffness of the body, and paper flapping.

[0071] Furthermore, the suitability for bag making (machine suitability), stiffness of the body, and paper flakes in Table 1 were evaluated according to the following criteria. Also, "-" in Table 1 indicates that it was not evaluated. <Suitability for bag making (suitability for machinery)> ○: Good mechanical suitability when processing the body of the bag with a bag-making machine. △: Mechanical suitability is slightly reduced due to increased friction coefficient, but it is still at an acceptable level. ×: The coefficient of friction is too high, resulting in poor sliding, making processing with a bag-making machine difficult. <Firmness of the torso> ○: The improved firmness can be felt due to the adhesive backing. ×: No improvement in firmness is felt from the adhesive backing. <Paper Feathers> ◎: There are no paper flap edges, and the overlapping parts of the sheet are integrated. ○: There are no paper flap issues, but the overlapping parts of the sheet appear slightly raised. ×: There are paper flakes.

[0072] [Table 1]

[0073] As shown in Table 1, the tube containers according to Examples 1 to 4 had no paper flakes on either the back seal portion of the body or the shoulder portion (the portion of the body welded to the flange portion), resulting in a highly aesthetic appearance. Furthermore, because the back seal portion was welded to the body, the rigidity of the body was improved, and the body felt more resilient. In addition, Examples 1 to 4 also exhibited good suitability for bag making when forming the body.

[0074] In Comparative Example 1, the tube container lacked a heat-sealable coating layer, resulting in paper flakes appearing at both the back seal portion of the body and the shoulder portion (the portion where the body is welded to the flange). Similarly, in Comparative Example 2, the amount of heat-sealable coating agent applied was insufficient, causing paper flakes to appear at both the back seal portion of the body and the shoulder portion (the portion where the body is welded to the flange). Therefore, the tube containers in Comparative Examples 1 and 2 were inferior to Examples 1-4 in terms of aesthetics. Furthermore, because the back seal portion was not welded to the body, the body had less rigidity compared to Examples 1-4. [Industrial applicability]

[0075] The tube container according to the present invention can be used as packaging material for pharmaceuticals, cosmetics, food, etc. [Explanation of Symbols]

[0076] 1 Torso 2 Spout part 3 Dispensing cylinder part 4. Flange section 5a, 5b ends 6a, 6b end 7. Back seal section 13 Overlapping parts 32 Paper layer 35. Sealant layer 40 Heat-weldable coating layer 41 sheets

Claims

[Claim 1] A dispensing nozzle has a cylindrical dispensing section and a flange section connected to one end of the dispensing section and extending outward from the dispensing section. It comprises a sheet having sealant on one side of the paper, a tubular body with one end closed and a predetermined range from the other end sealed to the flange portion, The torso portion has a back-sealed section formed by joining the rolled-up cylindrical sheets together in a gable shape and sealing them. At least a portion of the predetermined range of the torso is folded, thereby forming an overlapping portion between the sheets. The sheet of the body is formed by laminating a base film having a barrier layer and the sealant in that order on one side of the paper having a basis weight of 30 to 200 g / m². On the other side of the sheet of the body portion, when the back sealing portion is folded along the body portion, a heat-weldable coating agent is partially applied to the portion where the outer surface of the back sealing portion and the outer surface of the body portion come into contact, and to the predetermined range portion that is sealed to the flange portion. The amount of the heat-weldable coating agent applied is 0.2 to 40 g / m². The total thickness of the sheet in the body is 30 to 300 μm. A tube container in which the back sealing portion is folded so as to conform to the outer surface of the body portion and sealed to the body portion via the coating agent, and the overlapping sheets at the overlapping portion are sealed to each other via the coating agent.

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