Liquid paper container with a spout and a cap

Abstract

To provide a paper container for liquid fitted with a spout and a cap, having no possibility of caving or falling of a spout part from a container body, even when an external force is applied to the spout and the cap.SOLUTION: In a paper container for liquid fitted with a spout and a cap, the spout and the cap are cylindrical and formed of plastic moldings. The spout is formed of a cylindrical pouring port and a flange of an end part, the cap is engaged by covering a tip of the spout and tightly seals. The spout projects outward from a container inside of a spout fitting hole of the paper container for liquid, and the flange is bonded to the inside of the paper container and fitted. The cap has such a size that it cannot pass through the fitting hole. In a state in which the cap is engaged with the spout and seals the pouring port thereof, a lower end of the cap is in contact with the body of the paper container.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paper container for liquids. In particular, it relates to a paper container for liquids with a spout and a cap, which are the pouring outlets of the liquid paper container containing liquid as the content.

Background Art

[0002] Paper containers have been used as packaging materials for a long time. In recent years, those obtained by imparting water resistance to the paper base material are used to manufacture cases with a structure that can withstand even when the content is liquid, and are widely used as paper containers for liquids.

[0003] For example, paper packs containing liquids such as fruit juice, milk, tea, coffee, and health drinks have already been put into practical use. As containers, they are not only highly convenient, but also have functions such as light shielding, gas barrier property, and complete sealing, which can protect the content from the external environment and improve the storage stability.

[0004] Generally, paper containers have the following characteristics. · Lighter than metal cans and glass containers. · Do not break like glass containers. · Many are square containers, so they are suitable for storage such as refrigeration. · Not a rigid container like metal cans and glass containers, and can be folded and discarded after use. · Paper materials can be obtained relatively inexpensively, and surface processing such as printing is possible. · Can also be recycled and incinerated, and is an environmentally friendly container.

[0005] Recently, in order to improve convenience, paper containers with a spout and a cap, which are the pouring outlets of the liquid content, have also become popular. In this case, it is easy to open, and stable pouring is possible, and it is possible to make a liquid paper container with high convenience even in repeated opening and closing.

[0006] Among them, as disclosed in Patent Document 1, there is also a liquid paper container that can be made into a three-dimensional shape by bonding the peripheral edges of a rectangular top member and a rectangular bottom member of a paper container body with pre-formed folding lines and welding a spout and blowing air into it, which has been put into practical use.

[0007] However, in a paper container equipped with a spout and a cap as disclosed in Patent Document 1, generally the top surface shape is flat, and since the spout and the cap are arranged in the center thereof, for example, when an external force is applied or a dropping impact is applied with the top surface facing downwards, there is a risk that the spout portion may sink or fall off from the container body.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention has been made in view of such circumstances, and in a spout and a cap attached to a liquid paper container, even when an external force or an impact is applied to the spout and the cap, there is no risk that the spout portion may sink or fall off from the container body. The present invention aims to provide a liquid paper container equipped with a spout and a cap.

Means for Solving the Problems

[0010] As means for solving the above problems, the invention according to claim 1 is a liquid paper container made of a paper base material having a sealant layer and equipped with a spout and a cap, the paper container is composed of a paper container body made of a paper base material and a spout and a cap, the spout and the cap are cylindrical and made of a plastic molded product, ​The spout is composed of a cylindrical pouring opening and a flange at the end, The cap fits over the tip of the spout and can be sealed, The spout protrudes from the inside of the container towards the outside through the spout mounting hole of the liquid paper container, and the flange is adhered and mounted on the inside of the paper container, The cap is sized such that it cannot pass through the spout mounting hole, The cap is It consists of the upper cylinder and the lower cylinder, The upper cylinder has a fitting part with the spout, The lower cylinder has a larger diameter than the upper one, The cap is In a state where it fits onto the spout and seals its pouring opening, The lower cylinder The lower end of which is in contact with the main body of the paper container, is a liquid paper container equipped with a spout and a cap.

[0012] Also, the invention according to claim 2 is The fitting of the cap and the spout is characterized in that it is by screwing of a screw structure, the liquid paper container equipped with the spout and the cap according to claim to 1 described.

[0013] Also, the invention according to claim 3 is The adhesion between the flange of the spout and the paper container is by welding, the liquid paper container equipped with the spout and the cap according to claim 1 or 2 described.

[0014] Also, the invention according to claim 4 is The spout and the cap PU is are mounted on the top surface of the hexahedral paper container body, the liquid paper container equipped with the spout and the cap according to any one of claims 1 to 3 described.

Advantages of the Invention

[0015] According to the present invention, in a liquid paper container equipped with a spout and a cap attached to a paper container, even when an external force is applied to the spout and the cap, it is possible to provide a liquid paper container equipped with a spout and a cap in which the spout portion will not sink or fall off from the container body.

[0016] That is, the spout and the cap are cylindrical and made of a plastic molded product. The cap is sized such that it cannot pass through the spout attachment hole. The cap fits onto the spout and seals its pouring opening. By having the lower end of the cap in contact with the body of the paper container, even when an external force or impact is applied to the spout and the cap, the external force or impact is effectively dispersed and supported by the paper base material and the flange disposed inside the paper base material, without concentrating on the flange at the base portion of the spout during the spouting. Therefore, it is possible to prevent the spout from sinking or falling off from the liquid paper container body.

[0017] In particular, even when the spout and the cap are attached to the top surface of a hexahedral liquid paper container, it is possible to prevent the spout from sinking or falling off from the liquid paper container body.

[0018] Also, in particular, according to the invention described in claim 2, The cap consists of an upper cylinder and a lower cylinder. The upper cylinder has a fitting portion with the spout. The lower cylinder has a larger diameter than the upper cylinder, and by having its lower end in contact with the body of the paper container, it is possible to receive an external force or impact over a longer circumference, and prevent the spout from sinking or falling off from the liquid paper container body.

[0019] Also, in particular, according to the invention described in claim 3, The fitting between the cap and the spout is by means of a screw structure, which makes it possible to achieve easy opening and closing, effective sealing, and repeated opening and closing.

[0020] Through the screwing of the screw structure, a higher level of sealing can be achieved between the spout and the cap, preventing leakage of the liquid content of the liquid paper container and the like.

[0021] Also, in the case of screwing by the screw structure, the spout and the cap are more firmly connected by screwing along the circumference of the cylinder, and it is a structure that is difficult to separate by external force or impact from one direction.

[0022] Also, according to the invention particularly described in claim 4, The adhesion between the flange of the spout and the paper container is by welding. As a result, the sealant layer of the thermoplastic resin and the flange of the spout made of plastic material can be adhered without fear of affecting the contents compared to the case of using an adhesive or the like.

[0023] Also, according to the invention particularly described in claim 5, Since the spout and the cap are attached to the top surface of the hexahedral paper container body, a state where the risk of the spout being depressed or falling off from the liquid paper container body due to external force or impact is higher can be converted to a state with a lower risk by enhancing the strength against external force and impact by the structure of the spout and the cap.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0025] Hereinafter, a more detailed description will be given of a liquid paper container with a spout and a cap according to the present invention with reference to FIGS. 1 to 4. However, the present invention is not limited only by the examples shown here. The present invention is specified by the claims.

[0026] FIG. 1 is a perspective schematic view for explaining one embodiment of a liquid paper container with a spout and a cap according to the present invention.

[0027] The present invention is a liquid paper container in which a spout (10) and a cap (20) are attached to a liquid paper container made of a paper base material (30) having a sealant layer. The paper container is composed of a paper container body made of a paper base material (30), and a spout (10) and a cap (20). Further, the spout (10) and the cap (20) are cylindrical and made of plastic molded products.

[0028] The spout (10) is composed of a cylindrical pouring port (11) and a flange (12) at the end. Further, the spout (10) projects the pouring port (11) from the inside of the container toward the outside of the container through a spout attachment hole (31) provided in the paper base material (30) of the liquid paper container, and the flange (12) is adhered and attached to the inside of the paper container body.

[0029] The cap (20) fits over and covers the tip of the spout (10) and can be sealed. This fitting can be in any manner as long as sealing is possible. For example, as shown in FIG. 1, a threaded portion (13) is provided on the spout (10), and it can be made by screwing with a threaded portion provided inside the cap (20). However, since the threaded portion of the cap (20) is provided inside the cap (20), it is not visible in FIG. 1.

[0030] The screwing of such a spout (10) and cap (20) is also used for opening and closing a general container, and it is possible to achieve easy opening and closing, effective sealing, and repeated opening and closing.

[0031] In the case of screwing with a screw structure, the spout (10) and the cap (20) can achieve a higher degree of sealing and can prevent leakage of the liquid content of the liquid paper container.

[0032] Also, in the case of screwing with a screw structure, the spout (10) and the cap (20) are more firmly connected by screwing along the circumference of the cylinder, and it is a structure that is difficult to separate by an external force or impact from one direction.

[0033] In the present invention, the cap (20) fits over the spout (10) and seals its pouring opening (11), and the lower end (23) of the cap (20) is in contact with the main body of the paper container, which is a feature.

[0034] That is, since the lower end (23) of the cap (20) is in contact with the main body of the paper container, the cap (20) is fixed in a state continuous with the main body of the paper container. For example, even when an external force is applied to the spout (10) and the cap (20), the force can be dispersed and received by the paper base material (30) that constitutes the cap (20) and the main body of the paper container, and the flange (12) inside the paper base material (30). Therefore, it is possible to obtain a liquid paper container equipped with the spout (10) and the cap (20) in which the spout (10) will not sink or fall off from the main body of the paper container.

[0035] Also, in the example shown in FIG. 1, the cap (20) is an example consisting of an upper cylinder (21) and a lower cylinder (22). The upper cylinder (21) has a portion that fits with a screwing portion (13) provided on the spout (10). Further, the lower cylinder (22) has a larger diameter than the upper part (21), and in a state where the pouring opening (11) is sealed, its lower end is in contact with a paper base material (30) that constitutes the main body of the paper container.

[0036] In this case, due to the large diameter of the lower cylinder (22), its circumference also becomes large, and even when an external force is applied to the spout (10) and the cap (20), it is possible to receive the external force with a longer circumference, and it is possible to make a liquid paper container equipped with the spout (10) and the cap (20) such that the spout (10) is less likely to sink or fall off from the container body.

[0037] FIG. 2 is a schematic cross-sectional view for explaining an embodiment of a liquid paper container equipped with a spout and a cap according to the present invention.

[0038] As described above, the present invention is a liquid paper container in which a spout (10) and a cap (20) are attached to a liquid paper container made of a paper base material (30) having a sealant layer. The paper container is composed of a paper container body made of a paper base material (30), and a spout (10) and a cap (20).

[0039] Also, the spout (10) and the cap (20) are cylindrical and made of plastic molded products. The example shown in FIG. 2 is an example in which the cap (20) is composed of an upper cylinder (21) and a lower cylinder (22), similar to the example shown in FIG. 1.

[0040] One spout (10) is composed of a cylindrical pouring port (11) and a disc-shaped flange (12) at its end. The spout (10) protrudes the pouring port (11) from the inside of the container through a spout mounting hole (31) provided in the paper base material (30) of the liquid paper container toward the outside of the paper container, and the flange (12) is adhered and mounted inside the liquid paper container body with an adhesive portion (14).

[0041] There is no particular restriction on the means and method of adhering the flange (12) and the paper base material (30), but for example, welding can be used for adhesion. When welding is possible, the spout (10) and the cap (20) are made of a thermoplastic resin, and a thermoplastic resin layer is laminated on the surface of the paper base material (30) on the side to be welded.

[0042] This thermoplastic resin layer can be used as a sealant layer, and it is also possible to seal the paper base materials (30) together and use it for manufacturing the liquid paper container.

[0043] The cap (20) fits over the tip of the spout (10) and can be sealed. This fitting can be in any manner as long as it can be sealed. For example, in the example shown in Figure 2, the cap (20) and the spout (10) are threaded together with a threaded portion (24) inside the cap (20) and a threaded portion (13) outside the spout (10).

[0044] Threading is also used for opening and closing general containers, and it is possible to achieve easy opening and closing, effective sealing, and repeated opening and closing.

[0045] Also, in the case of threading with a screw structure, the spout (10) and the cap (20) can achieve a higher level of sealing and prevent leakage of the liquid content of the liquid paper container.

[0046] That is, in the case of screwing with a screw structure, the spout (10) and the cap (20) are more firmly connected by screwing by rotation along the circumference of the cylinder, and it is a structure that is difficult to separate by an external force or impact from one direction.

[0047] Further, in the present invention, the cap (20) is fitted to the spout (10) and seals its pouring port (11), and the lower end (23) of the cap (20) is in contact with the main body of the paper container. In the example shown in FIG. 2, a state of being in contact with the paper base material (30) constituting the liquid paper container by the lower end (23) of the cap (20) is shown.

[0048] That is, the cap (20) is fixed in a continuous state in contact with the main body of the paper container. For example Even when an external force or impact is applied to the spout (10) and the cap (20), the external force or impact does not concentrate on the spout (10), particularly the flange (12) at its base.

[0049] That is, in the liquid paper container equipped with the spout (10) and the cap (20) according to the present invention, it is effective to disperse and support the external force and impact with the cap (20), the paper base material (30), and the flange (12) disposed inside the paper base material (30). Therefore, it is possible to prevent the spout (10) from being depressed or falling off from the main body of the liquid paper container.

[0050] In particular, even when the spout (10) and the cap (20) are attached to the top surface of the hexahedral liquid paper container, the spout (10) and the cap (20) according to the present invention can increase the strength against external forces in a state where the risk of the spout (10) being depressed or falling off from the main body of the liquid paper container is higher, and can be converted to a state with a lower risk.

[0051] Also, particularly in the examples shown in FIGS. 1 and 2, it is an example where the diameter of the lower cylinder (22) is larger than that of the upper cylinder (21), and accordingly, the circumference of the lower cylinder (22) also becomes larger.

[0052] Therefore, even when an external force or impact is applied to the spout (10) and the cap (20), it is possible to receive the external force or impact along a longer circumference, and it is possible to provide a liquid paper container with the spout (10) and the cap (20) attached thereto, in which the spout (10) is less likely to sink or fall off from the container body more effectively.

[0053] FIG. 3 is a perspective schematic view for explaining an example in which a spout and a cap according to the present invention are attached to the top surface of a hexahedral liquid paper container body in one embodiment of the liquid paper container.

[0054] The example shown in FIG. 3 is a case where the main body of the liquid paper container (100) is hexahedral, and the spout (10) and the cap (20) are attached to the top surface. However, in the example shown in FIG. 3, the spout (10) is inside the cap (20) and is not visible.

[0055] When the spout (10) and the cap (20) are arranged as in the example shown in FIG. 3, the spout (10) and the cap (20) protrude outside the liquid container (100) from the top surface (32). Therefore, an external force (40) may be applied in situations such as handling or transporting the liquid paper container (100), or in the case of an unexpected drop or the like. The external force (40) or impact concentrates on the spout (10) and the cap (20), and particularly on the adhesive portion (14) of the spout (10), which may cause the spout (10) to sink or fall off.

[0056] Particularly with regard to dropping, when the liquid paper container drops with the surface to which the spout (10) and the cap (20) are attached facing downwards, the weight including the liquid content of the liquid paper container acts as an impact on the spout (10) and the cap (20) with the acceleration of the drop. Therefore, the risk of the spout (10) sinking or falling off is extremely high.

[0057] On the other hand, in the example shown in FIG. 3, the liquid paper container equipped with the spout (10) and the cap (20) according to the present invention has a cap (20) consisting of an upper stage (21) and a lower stage (22). The upper stage (21) has a structure that seals the pouring port (11) of the spout (10) by fitting the spout (10) and the cap (20).

[0058] Further, the lower stage (22) is in contact with the main body of the liquid paper container (100) and is effective in dispersing and supporting external forces and impacts with the cap (20), the paper base material (30), and the flange (12) disposed inside the paper base material (30). Particularly, even when it is mounted on the top surface (32) of the liquid paper container (100), it is effective in preventing the spout (10) from being sunken or falling off from the main body of the liquid paper container (100).

[0059] FIG. 4 is a schematic cross-sectional view for explaining an example in which the liquid paper container equipped with the spout and the cap according to the present invention is mounted on the top surface of a hexahedral liquid paper container body in one embodiment.

[0060] In the example shown in FIG. 4, the paper base material (30) is a laminate having a sealant layer, and the sealant layers (33) of two paper base materials (30) are overlapped so as to face each other, and a seal portion (34) is provided at the peripheral portion to form a container. One of the two paper base materials forms the upper half of the main body of the liquid paper container (100), and the other forms the lower half of the main body of the liquid paper container (100). At this time, the container can be formed, for example, by blowing air from the spout (10) to inflate the main body of the liquid paper container (100).

[0061] Therefore, since the inside of the main body of the liquid paper container (100) is covered with the sealant layer (33) and the sealant layer (33) is a thermoplastic plastic, a liquid paper container (100) having water resistance can be obtained. The material of the sealant layer (33) will be described later.

[0062] In the example shown in FIG. 4, the spout (10) and the cap (20) are arranged on the top surface (32) of the liquid paper container (100). The spout (10) protrudes outward from the container through a spout mounting hole (31) provided in the center of the top surface (32). The inner side of the flange (12) and the paper base material (30) of the top surface (32) of the liquid paper container (100) are adhered by an adhesive portion (14).

[0063] Also, in the spout mounting hole (31), the cross-section of the paper base material (30) is exposed. However, since the spout mounting hole (31) is adhered to the flange (12) of the spout (10), the cross-section of the paper base material (30) is not exposed to or in contact with the liquid of the content, and the water resistance of the inner surface of the liquid paper container (100) is maintained.

[0064] Also, in the example shown in FIG. 4, the only opening of the liquid paper container (100) is the pouring port (11) of the spout (10), and this is also sealed by the cap (20) covering it and being screwed together with the screwing portion (24) on the cap (20) side and the screwing portion (13) on the spout (10) side.

[0065] In this way, the sealant layer (33) of the paper base material (30) is effective for the purpose of manufacturing the liquid paper container (100), and is also effective when adhering, particularly welding, the spout (10) to the paper base material (30).

[0066] Here, regarding the spout (10) and the cap (20) according to the present invention, and regarding the paper base material (30) of the liquid paper container (100) to which they are attached, explanations will be added about their respective materials.

[0067] The spout (10) and the cap (20) are formed of molded articles made of a plastic material. The plastic material is not particularly limited, but for example, thermoplastic resins such as polyethylene resin and polyethylene terephthalate resin can be used, which have advantages in terms of price and mechanical strength, and can also be formed by injection molding using a mold. That is, in a method with excellent productivity, it is possible to form complex shapes such as fitting portions, particularly screwed portions.

[0068] The paper base material (30) of the liquid paper container can be composed of a laminate with paper as the base material. The lamination is performed to impart the functions required for the liquid paper container (100). For example, generally, paper itself is vulnerable in terms of water resistance, etc., so it is possible to impart water resistance by arranging a layer made of a plastic material on the surface. At this time, a thermoplastic resin can be selected for the plastic material and used as a sealant layer for sealing in the manufacturing of the liquid paper container (100).

[0069] The seal can be, for example, a heat seal. By overlapping the laminates of two paper base materials (30) so that the sealant layers (33) face each other, heating and pressing are performed to heat seal and bond them to each other, and the main body of the liquid paper container (100) can be assembled.

[0070] As the material of the sealant layer (33), polyolefin-based resins among thermoplastic resins are generally used. Specifically, it can be selected and used from low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), etc.

[0071] In addition, ethylene-based resins such as ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid resin copolymer, blend resins of polyethylene and polybutene, homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and polypropylene-based resins such as propylene-α-olefin copolymer can also be used.

[0072] To form the sealant layer (33), a resin melted using an extruder or the like can be formed into a film and formed into a layer on the laminate. Alternatively, it is also possible to form the sealant layer (33) on the surface of the laminate by laminating a material that has been previously formed into a film state by lamination.

[0073] The liquid paper container (100) is composed of a paper base material (30) provided with a sealant layer (33). That is, it is a laminate, and this laminate can also include, for example, a gas barrier layer for the purpose of improving storage properties.

[0074] By including a gas barrier layer in the laminate constituting the liquid paper container (100), it is possible to reduce the influence of the environment outside the liquid paper container (100) on the liquid of the contents, prevent deterioration and alteration of the contents, and improve long-term storage properties. It is also possible to prevent the dissipation of the components of the contents to the outside.

[0075] As the gas barrier layer, for example, a gas barrier film obtained by providing a gas barrier layer on the surface of a plastic film can be used.

[0076] In addition, metal foils such as aluminum and metal vapor deposition films are also effective as gas barrier layers, and can be appropriately selected and used according to the use of the liquid paper container (100) and the contents.

[0077] In the case of a gas barrier film, the plastic film used is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc., which can be appropriately selected according to the application. In particular, when using polypropylene or polyethylene terephthalate as the plastic film substrate, it is more preferable in terms of film strength and price.

[0078] In the case of a gas barrier film, the gas barrier layer can be composed of an inorganic compound vapor deposition layer and a layer formed by the wet coating method. After providing an anchor coat on the plastic film, the vapor deposition layer and the wet coating layer are sequentially provided.

[0079] For example, urethane acrylate can be used for the anchor coat layer of the gas barrier film. To form the anchor coat layer, in addition to forming a coating film using a coating method that applies a printing technique such as gravure coating to a paint in which a resin is dissolved in a solvent, other generally known coating methods can also be used to form a coating film.

[0080] As a method for forming the vapor deposition layer, an inorganic compound such as SiO or AlO can be coated on a plastic film provided with an anchor coat layer using the vacuum vapor deposition method to form an inorganic compound layer by the vacuum vapor deposition method. This layer is an optically transparent layer. Incidentally, the thickness of the vapor deposition layer is preferably 15 nm to 30 nm.

[0081] On top of the inorganic compound layer formed by this vacuum deposition method, a layer formed by a wet coating method can be further formed. As the method, an aqueous solution or a water / alcohol mixed aqueous solution containing at least one of a water-soluble polymer and (a) one or more alkoxides or their hydrolyzates, or both, or (b) tin chloride is used as a main agent to coat the film, and then heated and dried to form an inorganic compound layer by the coating method to obtain a coating layer. At this time, by adding a silane monomer to the coating agent, the adhesion to the anchor coat layer can be improved.

[0082] The inorganic compound layer has gas barrier properties even when it is only a layer formed by the vacuum deposition method. However, an inorganic compound layer formed by the wet coating method can be formed on top of the inorganic compound layer formed by the vacuum deposition method to form a gas barrier layer.

[0083] By the combination of these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer formed by the vacuum deposition method and the inorganic compound layer formed by the wet coating method, or the inorganic compound layer formed by the wet coating method fills and reinforces defects or micropores such as pinholes, cracks, and grain boundaries generated in the inorganic compound layer formed by the vacuum deposition method, thereby forming a dense structure.

[0084] Therefore, it is possible to realize higher gas barrier properties, moisture resistance, and water resistance as a gas barrier film, and also have flexibility to withstand deformation caused by external forces, so that it can also have desirable suitability as a packaging material.

[0085] Thus, according to the present invention, in the spout and cap attached to the liquid paper container, even when an external force or impact is applied to the spout and cap, it is possible to provide a liquid paper container with a spout and cap attached, in which the spout portion is not likely to be depressed or detached from the container body.

Examples

[0086] The liquid paper container with a spout and a cap according to the present invention will be further specifically described by Example 1, Example 2, and Comparative Example 1 and Comparative Example 2. However, the present invention is not limited only by the examples shown here. The present invention is specified by the claims.

[0087] Evaluation samples of the liquid paper container with a spout and a cap were created and evaluated. As the evaluation samples, those within the range defined in the present invention were taken as Example 1 and Example 2, and those deviating from the range defined in the present invention were taken as Comparative Example 1 and Comparative Example 2.

[0088] Regarding the layer structure of the paper base material constituting the paper container body and the resin of the spout, there were the following two types of specifications.

[0089] Specification 1: · Layer structure of the paper base material: From the outside of the container, Polyethylene / Paper / Adhesive resin / Inorganic compound vapor-deposited gas barrier film / Low-adsorption sealant · Resin of the spout: Polyethylene terephthalate was used.

[0090] Specification 2: · Layer structure of the paper base material: From the outside of the container, Polyethylene / Paper / Adhesive resin / Inorganic compound vapor-deposited gas barrier film / Polyethylene sealant · Resin of the spout: Polyethylene was used.

[0091] The evaluation items are as follows. Evaluation item: Drop test Test method: · Using the liquid paper container with a spout and a cap attached to the top surface of a hexahedral paper container as shown in the example of Fig. 3 as an evaluation sample. · Content: 400 g of water · Drop direction: Drop with the top surface facing down. · Height: 30 cm · Number of samples: n = 3

[0092] The evaluation counted the presence or absence of spout detachment. For all three samples where no spout detachment was observed, it was rated as ○. For those in which spout detachment occurred in one or more of the three samples, it was rated as ×.

[0093] <Example 1> · The cap shape was sized such that it could not pass through the spout attachment hole, and when the cap was tightened, the cylinder at the lower part of the cap was in contact with the container body. · The layer structure of the paper substrate and the specifications of the spout resin were set as Specification 1.

[0094] <Example 2> · The cap shape was sized such that it could not pass through the spout attachment hole, and when the cap was tightened, the cylinder at the lower part of the cap was in contact with the container body. · The layer structure of the paper substrate and the specifications of the spout resin were set as Specification 2.

[0095] <Comparative Example 1> · The cap shape was sized such that it could not pass through the spout attachment hole, and when the cap was tightened, the cylinder at the lower part of the cap was not in contact with the container body. This part deviates from the part defined in the present invention. · The layer structure of the paper substrate and the specifications of the spout resin were set as Specification 1.

[0096] <Comparative Example 2> · The cap shape was sized such that it could not pass through the spout attachment hole, and when the cap was tightened, the cylinder at the lower part of the cap was not in contact with the container body. This part deviates from the part defined in the present invention. · The layer structure of the paper substrate and the specifications of the spout resin were set as Specification 2.

[0097] The evaluation results are shown in Table 1.

[0098]

Table 1

[0099] As can be seen from Table 1, in the liquid paper container (100), the evaluations by the drop tests of Example 1 and Example 2, which are the spout (10) and the cap (20) according to the present invention, are both evaluated as ○, while the evaluations by the drop tests of Comparative Example 1 and Comparative Example 2, which are the spout (10) and the cap (20) deviating from the provisions of the present invention, are both evaluated as ×.

[0100] That is, it is clear that the shape of the cap (20) being such that it cannot pass through the spout attachment hole (31) and the cylindrical part (22) at the lower stage of the cap (20) being in contact with the main body of the liquid paper container (100) when the cap (20) is tightened is effective for solving the problems of the present invention.

[0101] Therefore, according to the present invention, it has been verified that it is possible to provide a liquid paper container equipped with a spout and a cap such that even when an external force or impact is applied to the spout and the cap, there is no fear of the spout part being sunken or falling off from the container main body.

Explanation of Signs

[0102] 10 ··· Spout 11 ··· Pouring opening 12 ··· Flange 13 ··· Screwing part 14 ··· Adhesive part 20 ··· Cap 21 ··· Upper cylindrical part 22 ··· Lower cylindrical part 23 ··· Lower end 24 ··· Screwing part 30 ··· Paper base material 31 ··· Spout attachment hole 32 ··· Top surface 33 ··· Sealant layer 34 ··· Sealing part 40 ··· External force 100 ··· Liquid paper container

Claims

1. A liquid paper container made of a paper substrate having a sealant layer, with a spout and a cap attached thereto, The paper container is composed of a paper container body made of a paper substrate, and a spout and a cap, The spout and the cap are cylindrical and made of plastic molded products, The spout is composed of a cylindrical pouring opening and a flange at the end, The cap fits over the tip of the spout and can be sealed, The spout protrudes from the inside of the container through the spout attachment hole of the liquid paper container toward the outside, and the flange is adhered and attached to the inside of the paper container, The cap is of a size that cannot pass through the spout attachment hole, The cap consists of an upper cylinder and a lower cylinder, The upper cylinder has a fitting portion with the spout, The lower cylinder has a larger diameter than the upper cylinder, A liquid paper container with a spout and a cap attached, characterized in that in a state where the cap is fitted to the spout and seals its pouring opening, the lower end of the lower cylinder is in contact with the body of the paper container.

2. The liquid paper container with a spout and a cap according to Claim 1, characterized in that the fitting between the cap and the spout is by screwing of a screw structure.

3. The liquid paper container with a spout and a cap according to Claim 1 or 2, characterized in that the adhesion between the flange of the spout and the paper container is by welding.

4. The liquid paper container with a spout and a cap according to any one of Claims 1 to 3, characterized in that the spout and the cap are attached to the top surface of a hexahedral paper container body.

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