Cap and tube container containing the same

Abstract

To provide a cap and a tube container comprising the same. the cap comprising a plastic molded article, and a paper molded article fitted into the plastic molded article from an opening and integrally rotatable with the plastic molded article, and the cap being capable of preventing the plastic molded article from falling from the opening.SOLUTION: A cap 10 comprises: a plastic molded article 30; and a paper molded article 40 into which the plastic molded article 30 is fitted from an opening 71. The plastic molded article 30 comprises a falling prevention part a for preventing the plastic molded article from falling from the opening 71. Further, a mass ratio of a material of the paper molded article 40 to a whole material of the cap 10 exceeds 50%. The paper molded article 40 comprises a cylindrical body part 70 whose one end forms the opening 71. The plastic molded article 30 comprises: a lid body part 50 for opening / closing a mouth 21 of a container 20 to which the cap 10 is attached; and a connection part 60 connected with the paper molded article 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cap and a tube container including the same, and comprises a plastic molded article and a paper molded article that fits into the interior from an opening and is rotatable integrally with the plastic molded article. [Background Art]

[0002] Conventionally, there has been known a pulp molded body in which a molded member is attached to an opening of a pulp molded member, a screw thread is formed on the outer peripheral surface of the molded member, and the lid can be attached to a container body by screwing a screw groove formed on the inner peripheral surface of the lid onto the screw thread (see paragraph number "0010" of the specification of Patent Document 1, and FIGS. 1 and 3). [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2001-219921 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in the above-described conventional pulp molded body, since the screw groove of the lid is formed by pulp molding, precision processing of the screw groove is difficult, and it is also difficult to maintain the sealing performance of the container. Accordingly, the present invention has been made to solve the conventional problems. An object of the present invention is to provide a cap which enables precision processing of a screw groove, improves sealing performance, suppresses an accompanying increase in the proportion of plastic, and does not easily become unusable even after repeated use, by using a plastic molded article within a necessary range for the use of the cap. [Means for Solving the Problem]

[0005] A cap according to one aspect of the present invention comprises a plastic molded product and a paper molded product that engages with the plastic molded product from the inside through an opening, and is characterized by having a fall prevention part that prevents the plastic molded product from falling out of the opening. Furthermore, a cap according to one aspect of the present invention is characterized in that the material of the paper molded product accounts for more than 50% by mass of the total material of the cap. A cap according to one aspect of the present invention is characterized in that the paper molded product comprises a cylindrical portion at one end which forms the opening, and the plastic molded product comprises a lid portion which opens and closes the mouth of a container to which the cap is attached, and a joint portion which is joined to the paper molded product, and the anti-detachment portion is located on the outer surface of the joint portion which is opposite to the inner surface of the cylindrical portion and protrudes toward the inner surface of the cylindrical portion.

[0006] A cap according to one aspect of the present invention is characterized in that the inner surface of the cylindrical portion is provided with a mesh-like uneven surface. A cap according to one aspect of the present invention is characterized in that the projection is wedge-shaped, with the amount of protrusion gradually increasing as it approaches the opening. A cap according to one aspect of the present invention is characterized in that the projection protrudes diagonally from the outer surface of the joint so as it approaches the opening. A cap according to one aspect of the present invention is characterized in that the inner surface of the cylindrical portion is formed in a polygonal or circular shape in plan view, the joint portion is formed in a polygonal or circular plate shape, and the protrusions are formed on the outer surface of the joint portion at positions that are equally spaced in the circumferential direction.

[0007] A cap according to one aspect of the present invention is characterized in that the projection portion is provided with a thin hinge portion between it and the joint portion. A cap according to one aspect of the present invention is characterized in that the projections are formed at equal intervals along the entire circumference of the joint and are provided with connecting portions that connect adjacent projections in a skirt-like manner in the circumferential direction of the joint. A cap according to one aspect of the present invention comprises a paper molded product having a cylindrical body portion at one end that forms the opening and a top plate portion that closes the other end of the cylindrical body portion, and a plastic molded product having a lid portion that opens and closes the opening and a joint portion that joins with the paper molded product, wherein a paper tube portion, which serves as a fall-prevention portion and is hollow cylindrical with open top and bottom surfaces, is fitted into the inner circumferential surface of the cylindrical body portion, the outer circumferential surface of the paper tube portion is in contact with the inner circumferential surface of the cylindrical body portion and axial movement is prevented by frictional resistance, and the peripheral edge of the joint portion is located between one end surface and the top plate portion.

[0008] A cap according to one aspect of the present invention is characterized in that the joint portion has a spike portion on the surface facing away from the lid portion that bites into the top plate portion. A cap according to one aspect of the present invention is characterized in that the joint portion is sandwiched between the top plate portion and the end face of the paper tube portion. A cap according to one aspect of the present invention is characterized in that the paper tube portion is fixed to the inner circumferential surface of the cylindrical body portion at a position in which the joint portion is movable in the axial direction between the top plate portion and the end face of the paper tube portion, and the top plate portion and the joint portion facing the top plate portion each have either a recess or a protrusion that fits into each other, and the height of the protrusion is such that when the joint portion is moved furthest toward the paper tube portion, the protrusion is completely detached from the recess.

[0009] A cap according to one aspect of the present invention is a cap comprising a plastic molded product and a paper molded product that engages with the plastic molded product from the inside through an opening, wherein the paper molded product comprises a cylindrical portion at one end which forms the opening, a top plate portion which closes the other end of the cylindrical portion, and a cylindrical paper tube portion located on the inner circumferential surface of the cylindrical portion, having an outer diameter less than or equal to the inner diameter of the cylindrical portion, and overlapping the cylindrical portion both internally and externally, wherein the wall thickness of the paper tube portion is greater than or equal to the wall thickness of the cylindrical portion. A tube container according to one aspect of the present invention is a tube container including a cap, comprising: a tubular body portion with one end closed; and a spout portion attached to the other end of the body portion, wherein the body portion is formed of a paper-based material.

Effects of the Invention

[0010] According to a cap according to one aspect of the present invention, the cap comprises a plastic molded product and a paper molded product that is fitted into the plastic molded product from an opening and is rotatable integrally with the plastic molded product, and the plastic molded product can be prevented from falling off from the opening.

Brief Description of Drawings

[0011] [Figure 1] It is a partial cross-sectional view of a cap according to the first embodiment of the present invention. [Figure 2] It is a side view of the cap and the container shown in FIG. 1. [Figure 3] It is an exploded perspective view of the cap shown in FIG. 1. [Figure 4] It is a perspective view of the plastic molded product shown in FIG. 1. [Figure 5] It is a perspective view of the paper molded product shown in FIG. 3. [Figure 6] It is a cross-sectional view of a cap according to the second embodiment of the present invention. [Figure 7] It is a cross-sectional view of a cap according to the third embodiment of the present invention. [Figure 8] It is a plan view of a cap according to Modification 1 of the fourth embodiment of the present invention. [Figure 9] It is a plan view of a cap according to Modification 2 of the fourth embodiment of the present invention. [Figure 10] It is a plan view of a cap according to Modification 3 of the fourth embodiment of the present invention. [Figure 11] It is a plan view of a cap according to the fifth embodiment of the present invention. [Figure 12] It is a cross-sectional view taken along line A-A shown in FIG. 11. [Figure 13]It is a vertical sectional view of the plastic molded product before being fitted. [Figure 14] FIG. 14 is a plan view of a cap according to a sixth embodiment of the present invention. [Figure 15] It is a sectional view along the line B-B shown in FIG. 14. [Figure 16] It is a perspective view of the cap shown in FIG. 14 as viewed from below. [Figure 17] It is a bottom view of the plastic molded product shown in FIG. 14. [Figure 18] It is a sectional view along the line C-C shown in FIG. 17. [Figure 19] It is a perspective view of the plastic molded product shown in FIG. 17. [Figure 20] It is a sectional view of a cap according to a seventh embodiment of the present invention. [Figure 21] It is a sectional view of a cap according to an eighth embodiment of the present invention. [Figure 22] According to a ninth embodiment of the present invention, FIG. (A) shows a state where the plastic molded product is locked with respect to the paper molded product, so that both can rotate together, and FIG. (B) shows a state where the locked state is released, so that the plastic molded product can idle within the paper molded product. [Figure 23] It is an exploded perspective view with a tube container according to a tenth embodiment of the present invention. [Figure 24] It is a perspective view of the spout portion. [Figure 25] It is a sectional view along the line D-D in FIG. 24. [Figure 26] It is a sectional view showing an example of a sheet constituting a body portion of a tube container according to an eleventh embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Embodiments of the present invention will be described below with reference to the drawings. Here, the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of thickness of each part, etc., may differ from reality. Furthermore, the embodiments shown below illustrate configurations for realizing the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not limit the material, shape, structure, etc. of the components to those described below. The technical idea of ​​the present invention is within the technical scope defined by the claims described in the patent claims, and various modifications can be made.

[0013] (First embodiment) A first embodiment of the present invention will be described. (Cap 10) As shown in Figures 1 to 5, the cap 10 broadly comprises a plastic molded product 30 and a paper molded product 40 that engages with the plastic molded product 30 from the opening 71.

[0014] (container 20) As shown in Figure 2, the container 20 is, for example, tubular and has an opening 21 from which the contents of the container 20 can be extracted. A cap 10 is detachably attached to the opening 21 of the container 20, and the opening 21 is opened and closed. The outer circumference of the opening 21 has male threads that allow the cap 10 to be attached and detached. Alternatively, female threads may be formed on the inner circumference of the opening 21. Furthermore, although a tube-shaped container was given as an example for container 20, it is not limited to this, and other types of containers 20 may also be used. Container 20 can be used for any purpose, but its contents may include, for example, shampoo, conditioner, body soap, facial cleanser, toothpaste, detergent, bleach, fabric softener, beverages, food, engine oil, etc.

[0015] (Plastic molded product 30) The plastic molded product 30 is an injection-molded plastic product. Any type of plastic is acceptable, but examples include polyethylene, polypropylene, polyvinyl chloride, and polystyrene. The plastic molded product 30 has a biomass-derived resin content in the raw material monomer that exceeds 50% by mass, preferably 60% by mass or more, and more preferably 80% by mass or more. Examples of biomass-derived resins include, in part or in whole, biomass polyethylene, biomass polypropylene, or biomass polyethylene terephthalate, which use biomass-derived ethylene or propylene as raw materials. The plastic molded product 30 has the minimum necessary functions for the cap 10, such as opening and closing the mouth 21 of the container 20, barrier properties, and airtightness.

[0016] (Each part of the plastic molded product 30) As shown in Figures 1, 3, and 4, the plastic molded product 30 has the following main parts. Details of each part of the plastic molded product 30 will be described later. (1) Lid portion 50 (2)Joint part 60

[0017] (Paper molded product 40) The paper molded product 40 is, for example, molded using pulp molding. Here, pulp mold refers to a material made by dissolving plant fibers (mainly recycled paper) in water, intertwining them, forming the material in a mold, and then drying it. Furthermore, the paper molded product 40 is not limited to pulp molds, but may also be manufactured using a paper material injection molding method that uses a molding material mainly composed of pulp and starch as its main components to realize a three-dimensional three-dimensional structure, a paper tube manufacturing method, or a manufacturing method that uses mold materials such as cups and containers, or it may be manufactured using insert injection technology, in which a paper blank is placed in an injection molding die and integrally molded. The paper molded product 40 is made from a biomass material mainly composed of paper, and its mass ratio exceeds 50% of the total material of the cap 10, preferably 60% by mass or more, and more preferably 80% by mass or more.

[0018] (biomass) Biomass refers to renewable, biologically derived organic resources, excluding fossil fuels. Biomass elements are classified into (1) waste biomass, (2) unused biomass, and (3) resource crops, depending on their availability. Waste biomass includes, for example, waste paper, food waste, and black liquor (pulp mill wastewater). Unused biomass includes, for example, rice straw, wheat straw, rice husks, and forest residues. Resource crops include, for example, carbohydrate resources (such as sugarcane), starch resources (such as corn), oil and fat resources (such as rapeseed), willow, poplar, switchgrass, and the like. The thickness of the paper molded product 40 is, for example, 0.5 mm to 5.0 mm when considering a rough mold, and preferably 0.8 mm to 5 mm when considering a high-resolution pulp mold.

[0019] (Each part of the paper molded product 40) As shown in Figures 1, 3, and 5, the paper molded product 40 has a cylindrical portion 70. Details of the cylindrical portion 70 will be described later.

[0020] (Lid portion 50) The lid portion 50 opens and closes the mouth portion 21 of the container 20. The lid portion 50 is formed in a cylindrical shape, for example, a cylindrical shape. The inner circumferential surface of the lid portion 50 has a screw portion 51, which is a female thread corresponding to the male thread formed on the outer circumferential surface of the opening portion 21. In this example, a female screw portion 51 is formed on the inner circumferential surface of the lid portion 50. However, this is not the only option. For example, in the case of a container with a large diameter opening, a female screw may be formed on the inner circumferential surface of the opening 21, and a male screw corresponding to it may be formed on the outer circumferential surface of the lid portion 50. Furthermore, the lid portion 50 is connected to the center of the joint portion 60 such that its axial direction is perpendicular to the surface of the joint portion 60.

[0021] (joint part 60) The joint portion 60 protrudes from the top of the lid portion 50 and engages with the inside of the cylindrical portion 70 through the opening 71. The end faces of the joint portion 60, located on the left and right outer sides of its center, are positioned within the opposing spacing of the inner surfaces of the cylindrical portion 70. The spacing of the end faces of the joint portion 60, located on the left and right outer sides of its center, is set to be greater than or equal to the opposing spacing of the inner surfaces of the cylindrical portion 70 along its entire circumference. As a result, the joint portion 60 fits into the opposing spacing of the inner surfaces of the cylindrical portion 70. The joint portion 60 makes gapless contact with the inner surface inside the cylindrical portion 70 and functions as an anti-detachment part a, preventing the plastic molded product 30 from falling out of the opening 71 due to the frictional resistance between the two. Furthermore, a mesh-like uneven surface 74 is formed on the inner surface of the cylindrical portion 70, and the outer end surface of the joint portion 60 catches on it, thereby more reliably preventing it from falling off. The joint portion 60 is formed in the shape of a regular polygon, for example, a regular hexagonal plate. Although a regular hexagon was used as an example of the regular polygon of the joint 60, it is not limited to this, and other regular polygons such as an equilateral triangle, regular square, regular pentagon, or regular heptagon or more may also be used.

[0022] (Cylinder part 70) The cylindrical portion 70 has an opening 71 on its lower surface and is closed on its upper surface by a top plate portion 72, forming the entire structure in a cap shape. The cylindrical portion 70 is hollow inside, and with the plastic molded product 30 fitted inside, the paper molded product 40 and the plastic molded product 30 rotate together as a single unit. The cylindrical portion 70 extends from its entire outer circumference to surround the plastic molded product 30, and when the lid portion 50 closes the mouth portion 21, the tip portion abuts against the container 20 so as to conceal the mouth portion 21 of the container 20. The cylindrical portion 70 is a polygonal prism shape composed of side plates rising from each side of the regular polygon of the joint portion 60, for example, a regular hexagonal prism shape. Furthermore, a reinforcing flange portion 73 is formed at the tip of the cylindrical portion 70, which surrounds the hexagonal edge in a circular shape. The flange portion 73 is formed in a circular shape to improve the rigidity of the cylindrical portion 70.

[0023] (Assembly of Cap 10) The assembly of the cap 10 will be explained using Figures 1 and 3. When the plastic molded product 30 is inserted into the paper molded product 40 from the joint portion 60 side, aligning it with the opening 71 of the cylindrical portion 70, the opposing inner surfaces of the cylindrical portion 70 are pressed against the outer end surfaces of the joint portion 60, stretching the paper and fitting into the opening 71 of the cylindrical portion 70. The plastic molded product 30 is pushed into the paper molded product 40 until the upper surface of the joint portion 60 contacts the lower surface of the top plate portion 72.

[0024] At this time, when the joint 60 is fitted into the cylindrical part 70, the paper molded product 40, which was stretched during fitting, contracts, causing the inner surface of the cylindrical part 70 and the outer surface of the joint 60 to adhere tightly, preventing the plastic molded product 30 from falling out of the opening 71 of the cylindrical part 70. Furthermore, since the inner surface of the cylindrical part 70 is a regular hexagon and the outer surface of the joint 60 is a regular hexagon, the inner and outer corners overlap, allowing the paper molded product 40 and the plastic molded product 30 to rotate together. As a result, even if the cap 10 is repeatedly attached to and detached from the container 20, the plastic molded product 30 and the paper molded product 40 do not easily separate, and the function of the cap 10 can be maintained for a long period of time.

[0025] (Second embodiment) A second embodiment will be described. The paper molded product 40 has a cylindrical body portion 70 at one end which forms an opening 71, and the plastic molded product 30, as shown in Figure 6, has a lid portion 50 that opens and closes the mouth portion 21 of the container 20 to which the cap 10 is attached, and a joint portion 60 that joins with the paper molded product 40, and the fall prevention portion a is located on the outer surface of the joint portion 60 facing the inner surface of the cylindrical body portion 70 and has a projection portion 61 that protrudes toward the inner surface of the cylindrical body portion 70. The amount of protrusion of the projection 61 is set to be less than the wall thickness of the cylindrical body 70.

[0026] When the joint portion 60 is fitted from below, aligning it with the opening 71 of the cylindrical portion 70, the protrusions 61 located at both ends of the joint portion 60 press against it, stretching the paper as it fits into the opening 71 of the cylindrical portion 70. The joint portion 60 is pushed in until its upper surface contacts the lower surface of the top plate portion 72, and then lowered slightly, causing it to bite into the inner surface of the cylindrical portion 70, preventing the plastic molded product 30 from falling out of the opening 71 of the cylindrical portion 70. The projection 61 is wedge-shaped, with its protrusion gradually increasing as it approaches the opening 71. An undercut is provided on the end face of the projection 61. Because the projection 61 is formed in a wedge shape, it is difficult for the projection 61 to come loose after being embedded.

[0027] (Third embodiment) A third embodiment will be described. As shown in Figure 7, the projection 61 protrudes diagonally outward from the outer surface of the joint 60 as it approaches the opening 71. Because the projection 61 protrudes at an angle, it is less likely to come loose once it has gripped the object.

[0028] (Fourth embodiment) A fourth embodiment will now be described. The fourth embodiment includes three variations 1 to 3. As shown in Figures 8 to 10, the inner surface of the cylindrical portion 70 is formed in a circular shape in plan view, the joint portion 60 is formed in a polygonal or circular plate shape, and the protrusions 61 are formed on the outer surface of the joint portion 60 at positions spaced equally apart in the circumferential direction. The protrusions 61 are positioned at equal intervals in the circumferential direction on the outer surface of the joint portion 60. Therefore, when the outer surface of the cylindrical portion 70 is held, the cylindrical portion 70 deforms slightly in the direction of diameter reduction, causing at least two of the multiple protrusions 61 located along the diameter to equally bite into the inner surface of the cylindrical portion 70, preventing the plastic molded product 30 from falling out of the cylindrical portion 70, and allowing the cylindrical portion 70 and the plastic molded product 30 to rotate together.

[0029] (Modification 1 of the fourth embodiment) A modified example of the fourth embodiment, Part 1, will now be described. As shown in Figure 8, the inner surface of the cylindrical portion 70 is formed in a circular shape in plan view, and the joint portion 60 is located on the inner circular surface, which is formed in the shape of a regular hexagonal polygon plate, for example. At each corner of the polygon, there are a total of six projections 61 that protrude conically toward the inner surface of the cylindrical portion 70, and the projections 61 are formed at positions that are equally spaced in the circumferential direction on the outer surface. In other words, the projections 61 are spaced at 60-degree intervals in the circumferential direction on the outer surface of the joint portion 60. Therefore, when the outer surface of the cylindrical portion 70 is held, the cylindrical portion 70 deforms slightly in the direction of diameter reduction, causing at least two of the six projections 61 located along the diameter to bite into the inner surface of the cylindrical portion 70, preventing the plastic molded product 30 from falling out of the cylindrical portion 70, and allowing the cylindrical portion 70 and the plastic molded product 30 to rotate together.

[0030] (Modification 2 of the fourth embodiment) A second modified example of the fourth embodiment will now be described. As shown in Figure 9, the inner surface of the cylindrical body 70 is formed in a circular shape when viewed from above. The joint portion 60 is located on the inner circular surface, and the joint portion 60 is formed in a rectangular plate shape. A total of three protrusions 61 are located on the outer surface of the joint portion 60. The protrusions 61 are formed at positions on the outer surface that are equally spaced in the circumferential direction at 120-degree intervals. The protrusions 61 are also equally spaced in the circumferential direction on the outer surface of the joint portion 60. Therefore, when the outer surface of the cylindrical body 70 is held, the cylindrical body 70 deforms slightly in the direction of diameter reduction, causing the three protrusions 61 to bite into the inner surface of the cylindrical body 70, preventing the plastic molded product 30 from falling out of the cylindrical body 70, and allowing the cylindrical body 70 and the plastic molded product 30 to rotate together.

[0031] (Modification 3 of the fourth embodiment) A third modified example of the fourth embodiment will now be described. As shown in Figure 10, the inner surface of the cylindrical body portion 70 is formed in a circular shape when viewed from above. A joint portion 60 is located on the inner circular surface, and the joint portion 60 is formed in a rectangular plate shape. Two projections 61 are located on the outer surface of the joint portion 60. The projections 61 are formed at positions on the outer surface that are equally spaced in the circumferential direction at 180-degree intervals. Then, when the opposing outer surfaces of the cylindrical body 70, which are orthogonal to each other and have a phase difference of 90 degrees from the opposing directions of the two protrusions 61, are pressed together by hand in a direction that brings them closer to each other, the cylindrical body 70 deforms into an elongated ellipse in the direction of the opposing directions of the two protrusions 61, the two protrusions 61 separate from the inner surface of the cylindrical body 70, and the joint is released. As a result, the joint 60 comes out of the opening 71 of the cylindrical body 70, and the paper molded product 40 and the plastic molded product 3 are separated and can be disposed of separately.

[0032] (Fifth embodiment) A fifth embodiment will be described. As shown in Figures 11-12, the projection 61 is provided with a thin hinge portion 62 between it and the joint portion 60. The inner circumferential surface of the cylindrical body portion 70 is formed in a circular shape when viewed from above, and the joint portion 60 is located on the inner circumference of the cylindrical body portion 70, with an outer shape formed in the form of a regular hexagonal polygonal plate. The distance between opposing sides of the joint portion 60 is set to be shorter than the diameter of the inner circumferential surface of the cylindrical body portion 70, and the outer surfaces located on the sides of the joint portion 60 are located away from the inner circumferential surface of the cylindrical body portion 70. A projection 61 is formed on each of the six sides, so that the joint portion 60 as a whole has six projections 61 at 60-degree intervals. Between the joint portions 60, a hinge portion 62 is formed by cutting out a pointed triangular shape from the lower surface of the joint portion 60 upwards.

[0033] As shown in Figure 13, the projection 61 extends linearly from the joint 60 via the hinge 62 before being attached to the cap 10. When the joint 60 is inserted into the opening 71 of the cylindrical body 70, the projection 61 is pressed against the end face of the opening 71, as shown in Figure 12, and folds downward via the hinge 62, moving into the opening 71. As the joint 60 moves further into the opening 71, the inner circumferential surface of the cylindrical body 70 is pressed against by the projection 61, stretching the paper, while the joint 60 moves into the interior of the cylindrical body 70. The joint 60 is then pushed in until its upper surface contacts the lower surface of the top plate 72, and when the pushing force is released, the projection 61 bites into the inner circumferential surface of the cylindrical body 70, preventing the plastic molded product 30 from falling out of the opening 71 of the cylindrical body 70. Furthermore, the six protrusions 61 bite into the inner circumferential surface of the cylindrical body 70 at predetermined intervals, so that when the cap 10 is rotated, the paper molded product 40 and the plastic molded product 30 rotate together.

[0034] (Sixth embodiment) A sixth embodiment will now be described. As shown in Figures 14-19, 36 projections 61 are formed along the entire circumference of the joint 60 at 10-degree intervals, and 36 connecting portions 64 connect adjacent projections 61 in a skirt-like manner in the circumferential direction of the joint 60. As a result, the projections 61 are subdivided into dots, increasing the area that bites into the inner surface of the cylindrical body 70, improving the ability to follow the deformation of the cap 10. By connecting adjacent projections 61 in a skirt-like manner and adding pleats, the ability to attach the cap 10 to deformation is improved, and by evenly distributing them around the entire circumference, it becomes more securely difficult for them to come off.

[0035] (Seventh Embodiment) A seventh embodiment will be described. As shown in Figure 20, the paper molded product 40 comprises a cylindrical portion 70 at one end which forms an opening 71, and a top plate portion 72 that closes the other end of the cylindrical portion 70. The plastic molded product 30 comprises a lid portion 50 that opens and closes the mouth portion 21, and a joint portion 60 that joins with the paper molded product 40. A paper tube portion 80, which serves as a fall-prevention portion a, is fitted into the inner circumferential surface of the cylindrical portion 70 and is hollow and cylindrical with open top and bottom surfaces. The outer circumferential surface of the paper tube portion 80 is in contact with the inner circumferential surface of the cylindrical portion 70, and axial movement is prevented by frictional resistance. The peripheral edge of the joint portion 60 is located between one end face and the top plate portion 72. As a result, the paper tube section 80 prevents the plastic molded product 30 from falling out of the opening 71 of the cylindrical section 70. The wall thickness of the paper tube section 80 shall be equal to or greater than the wall thickness of the cylindrical section 70. Preferably, the wall thickness of the paper tube section 80 shall be 2 mm or more, compared to a wall thickness of 1 mm for the cylindrical section 70. As a result, the rigidity of the cylindrical body 70 can be easily improved.

[0036] (Modified version of the seventh embodiment) A modified example of the seventh embodiment will now be described. In other words, this modified configuration is the same as that of the seventh embodiment shown in Figure 20, but further involves adhering the outer surface of the paper tube portion 80 to the inner surface of the cylindrical portion 70 with glue or the like. As a result, the outer surface of the paper tube section 80 can be fixed even more firmly to the inner surface of the cylindrical body section 70 without any displacement.

[0037] (Eighth embodiment) An eighth embodiment will be described. That is, as shown in Figure 21, the configuration of the eighth embodiment is the same as the configuration of the seventh embodiment shown in Figure 20, and furthermore, the joint portion 60 has a spike portion 63 on the side facing away from the lid portion 50 that bites into the top plate portion 72. As a result, the spike portion 63 of the joint portion 60 allows the paper tube portion 80 and the plastic molded product 30 to rotate together more reliably.

[0038] (Ninth embodiment) A ninth embodiment will be described. That is, in the ninth embodiment, as shown in Figure 22, the paper tube portion 80 is fixed to the inner circumferential surface of the cylindrical portion 70 at a position where the joint portion 60 is movable in the axial direction of the cylindrical portion 70 between the top plate portion 72 and the end face of the paper tube portion 80. The top plate portion 72 and the joint portion 60 facing the top plate portion 72 each have either a recess 75 or a protrusion 65 that fits into each other, and the height of the protrusion 65 is such that when the joint portion 60 is moved furthest toward the paper tube portion 80, the protrusion 65 is completely detached from the recess 75.

[0039] (The fit between the recessed part 75 and the convex part 65) When the top plate portion 72 of the cylindrical portion 70 is pushed toward the joint portion 60, as shown in Figure 22(A), the recessed portion 75 and the convex portion 65 fit together, connecting the paper tube portion 80 and the plastic molded product 30, allowing them to rotate together. As a result, the container 20 can only be opened when the cylindrical portion 70 is pushed in.

[0040] (The distance between the recessed portion 75 and the convex portion 65) In contrast, if the top plate portion 72 of the cylindrical portion 70 is stopped from being pushed in and the cylindrical portion 70 is intentionally raised, as shown in Figure 22(b), the recessed portion 75 and the convex portion 65 separate, the connection between the paper tube portion 80 and the plastic molded product 30 is released, and even if the paper tube portion 80 is rotated, the plastic molded product 30 will spin freely. As a result, the container 20 cannot be opened. As a result, as shown in Figure 22(B), if the paper molded product 40 is rotated to a position where the recess 75 and the protrusion 65 do not overlap while the recess 75 and the protrusion 65 are disengaged, the plastic molded product 30 cannot be rotated and removed from the container unless the paper molded product 40 is rotated to a position where the recess 75 and the protrusion 65 engage. This provides a cap that cannot be opened or closed accidentally by children, such as a childproof cap, and prevents accidental operation.

[0041] (Tenth embodiment) A tenth embodiment will be described. A tube container 100 including a cap 10, comprising, as shown in Figure 23, a tubular body 110 with one end 111 of the body 110 closed, and a mouth 21 attached to the other end of the body 110, wherein the body 110 is formed of a paper-based material. As a result, a cap 10 that fits the tube container 100 can be provided.

[0042] (Mouth 21) As shown in Figures 23 to 25, the spout 21 is a spout for extracting the contents contained in the body 110 to the outside, and comprises a cylindrical dispensing tube 120 and an overhang 130. The overhang 130 is a flat plate-like portion that is connected to one end of the dispensing tube 120 (the lower end in Figure 23) and extends outward from the dispensing tube 120. In this embodiment, the overhang 130 is formed to extend in a direction perpendicular to the axial direction of the dispensing tube 120 (the left-right direction in Figure 23). The overhang 130 is formed in an annular shape, but the shape of the overhang 130 is not limited as long as it can be joined to the body 110, and may be elliptical, oblong, track-shaped, polygonal, etc.

[0043] The mouth portion 21 is molded from a material containing a thermoplastic resin and a filler other than the resin. The thermoplastic resin used for the mouth portion 21 can be, for example, one or more of polyethylene, polypropylene, polyester, polyamide, and cyclopolyolefin. The filler can be one or more of talc, kaolin, paper powder, and cellulose fiber. By using a mixture of a thermoplastic resin and a filler other than the resin as the material for the mouth portion 21, it is possible to reduce the amount of resin used while maintaining moldability and heat-welding properties with the sheet material of the body portion 110. The molding method for the mouth portion 21 is not particularly limited, but existing molding methods such as injection molding, thermoforming (including vacuum forming and hot plate pressure forming), and compression molding can be used.

[0044] When manufacturing the tube container 100, methods for welding the body 110 and the mouth 21 can include ultrasonic welding, high-frequency welding, heat seal welding, hot air welding, and compression molding of the body insert. However, ultrasonic welding is preferred because it is less affected by the heat insulation properties of the paper.

[0045] When the tube length of the tube container 100 is L and the tube diameter is D, it is preferable that L / D be in the range of 1 to 10, and more preferably in the range of 1.5 to 8. Here, as shown in Figure 23, the tube length L is the axial length from the welding point to the protruding portion 130 to the end of the body portion 110, and the tube diameter D is the diameter of the protruding portion 130 if the protruding portion 130 is circular, and (A+B) / 2 if the protruding portion 130 is elliptical (where A: major axis of the ellipse, B: minor axis of the ellipse). If the value of L / D is less than 1, the tube length L is too short for the tube diameter D, and the shape of the tube container 100 becomes unsuitable as a packaging container. On the other hand, if the value of L / D exceeds 10, the tube length L is too long for the tube diameter D, resulting in a poor appearance of the tube container 100 and making the shape of the tube container 100 unsuitable as a packaging container.

[0046] The tube container 100 may further be equipped with a screw cap that can be attached and detached by screwing it onto the dispensing cylinder portion 120 of the mouth portion 21. If the tube container 100 is equipped with a screw cap, it becomes easier to reseal the tube container 100 after it has been opened. Furthermore, the tube container 100 may be equipped with a hinged cap instead of a screw cap. If a hinged cap is provided, the hinged cap may be attached to the opening 21 by screwing it onto the dispensing cylinder portion 120 shown in Figure 23. Alternatively, ribs may be provided on the outer surface of the dispensing cylinder portion 120 instead of screw threads, and the hinged cap may be attached to the opening 21 by fitting through the ribs.

[0047] Furthermore, the inside of the dispensing cylinder portion 120 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 portion 120 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 half-cut portion of the partition wall, thereby removing a part of the partition wall enclosed by the half-cut and forming an opening for dispensing the contents from the body portion 110 to the dispensing cylinder portion 120.

[0048] As described above, in this embodiment, the body portion 110 is made of a sheet containing paper and sealant, and the mouth portion 21 is molded from a material containing thermoplastic resin and fillers other than resin. The mass proportion of paper is the highest in the total mass of the materials constituting the body portion 110 and the mouth portion 21. In conventional resin tube containers, if the resin layer of the sheet constituting the body portion 110 is simply thinned, the body portion 110 lacks rigidity, reducing the self-supporting ability and handling properties of the tube container 100. In contrast, in this embodiment, by using paper as the structural material of the body portion 110, the amount of resin used can be reduced while providing rigidity to the body portion 110. Furthermore, the inclusion of fillers other than resin in the molding material of the mouth portion 21 also reduces the amount of resin used in the tube container 100. Therefore, according to this embodiment, a tube container 100 can be realized that uses less resin than conventional containers and has the rigidity necessary for self-supporting ability and handling properties. Also, the basis weight of the paper used for the body portion 110 is 200 g / m². 2 Therefore, the rounding process when forming the body portion 110, the welding of the bonding portion 7, the folding of the end portion 111 of the body portion 110 near the mouth portion 21, and the welding of the protruding portion 130 near the end portion 111 of the body portion 110 can be performed without problems, and the moldability by the processing equipment is good.

[0049] Furthermore, in the tube container 100 according to this embodiment, as shown in Figures 24 and 25, the protruding portion 130 has a flat plate shape perpendicular to the central axis of the dispensing cylinder portion 120, and the body portion 110 is welded to the outer surface of the protruding portion 130. Therefore, when the contents of the tube container 100 become low, the contents can be easily squeezed out by folding the body portion 110 along the outer edge of the protruding portion 130. Also, since the protruding portion 130 has a flat plate shape and does not create a space where contents remain, the contents can be squeezed out completely by folding the body portion 110 along the outer edge of the protruding portion 130, making the protruding portion 130 and the body portion 110 almost flat.

[0050] (11th embodiment) An eleventh embodiment will be described. The body 110 of the tube container 100 is made of a sheet 140 mainly composed of paper, as shown in Figure 26. Sheet 140 is a multilayer sheet in which a base film layer 142, a barrier layer 143, and a sealant layer 144 are laminated in that order on one side of a paper layer 141, a paper protection layer 145 is laminated on the other side of the paper layer 141, and an ink layer 146 and an overcoat varnish layer 147 are further laminated on the paper protection layer 145. Details of each layer will be described below.

[0051] (Paper layer 141) The paper layer 141 is a structural layer that provides strength and rigidity to the tube container 100. The type of paper that makes up the paper layer 141 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 141, if necessary.

[0052] The basis weight of the paper used for paper layer 141 is 30-200 g / m². 2 It is 50-120 g / m² 2 It is preferable that the basis weight of the paper used in the paper layer 141 be 30 g / m². 2If the value is less than 200 g / m², the stiffness of the body section 110 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 141, but this would lead to an increase in the resin ratio, which is undesirable from the standpoint of reducing environmental impact. Also, the basis weight of the paper used for the paper layer 141 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 welding properties, and the manufacturing costs will also increase, which is undesirable.

[0053] (Base film layer 142) The base film layer 142 is a layer that imparts heat resistance and physical strength such as toughness to the sheet 140. The base film layer 142 is also the base layer for the barrier layer 143. The material of the film constituting the base film layer 142 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 142 may be made of paper.

[0054] (Barrier layer 143) The barrier layer 143 is a functional layer that blocks oxygen, water vapor, etc., to improve the preservation of the contents. The barrier layer 143 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 143 may be pre-laminated on the base film layer 142 to form a barrier film, or it may be provided as a single layer film.

[0055] (Sealant layer 144) The material of the sealant layer 144 is not particularly limited, but it is preferably a thermoplastic resin such as polypropylene, polyethylene, cyclic polyolefin, or polyester. The sealant layer 144 uses a resin whose softening temperature is 20°C or more lower than the softening temperature of the base film layer 142. If the softening temperature of the sealant layer 144 is not 20°C or more lower than the softening temperature of the base film layer 142, it is undesirable because the base film layer 142 will soften during sealing, increasing the likelihood of pinholes occurring. It is preferable that the softening temperature of the sealant layer 144 is 40°C or more lower than the softening temperature of the base film layer 142.

[0056] The thermoplastic resin used in the sealant layer 144 can be any material that adheres to the thermoplastic resin that makes up the material of the opening 21, which will be described later, but it is preferable that it be the same material as the thermoplastic resin used in the opening 21. By using the same thermoplastic resin for the sealant layer 144 and the thermoplastic resin layer used in the opening 21, the seal strength between the body 110 and the opening 21 can be improved.

[0057] (Paper protective layer 145) The paper protective layer 145 is a layer that protects the paper layer 141 constituting the sheet 140 from the adhesion of contents and dirt. The material and formation method of the paper protective layer 145 are not particularly limited, but the paper protective layer 145 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 145 is preferably 0.2 to 50 μm, and more preferably 1 to 20 μm. If the thickness of the paper protective layer 145 is less than 0.2 μm, pinholes may occur in the paper protective layer 145, and the protection of the paper layer 141 may be insufficient. Also, if the thickness of the paper protective layer 145 exceeds 50 μm, it is undesirable in terms of resin usage and manufacturing costs.

[0058] (Ink layer 146, overcoat varnish layer 147) The ink layer 146 is a layer applied by printing for various markings, and the overcoat varnish layer 147 is a layer for providing abrasion resistance, etc. The layering order of the ink layer 146 and the overcoat varnish layer may be reversed from that shown in Figure 26. Also, the overcoat varnish layer 147 may also serve as the paper protection layer 145.

[0059] The thickness (total thickness) of the sheet 140 constituting the body portion 110 is not particularly limited, but is preferably 30 to 300 μm. If the thickness of the film constituting the body portion 110 is within this range, the body portion 110 can be easily processed into a cylindrical shape using a bag-making machine or a pillow / stick packaging machine. Furthermore, since the paper layer 141 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.

[0060] In order to reduce the resin ratio of the sheet 140 that constitutes the body 110, it is preferable that the paper layer 141 accounts for 50% or more of the mass of the sheet 140. From the viewpoint of reducing the amount of resin used, a higher proportion of the paper layer 141 is preferable.

[0061] Furthermore, the sheet constituting the body portion 110 only needs to have a sealant layer 144 laminated on at least one side of the paper layer 141 (the side facing the inside of the tube container 100), and one or more of the above-mentioned base film layer 142, barrier layer 143, paper protection layer 145, ink layer 146, and overcoat varnish layer 147 may be omitted.

[0062] (Features and effects of the embodiment) The features and effects of this embodiment are as follows: (First characteristic) The first characteristic feature is that the cap 10 comprises a plastic molded product 30 and a paper molded product 40 that engages with the plastic molded product 30 from the opening 71, as shown in Figure 1, and is equipped with a fall prevention part a that prevents the plastic molded product 30 from falling out of the opening 71. (Effect of the first feature point) According to the first feature, the anti-detachment part a prevents the plastic molded product 30 from falling out of the opening 71 of the paper molded product 40.

[0063] (Second characteristic) The second characteristic is that the material of the paper molded product 40 accounts for more than 50% by mass of the total material of the cap 10. (Effect of the second feature point) According to the second characteristic, by limiting the use of plastic molded products to the extent necessary for the cap's application and actively using paper molded products as the primary material, it is possible to better meet the targets for reducing single-use plastic products.

[0064] (Third characteristic) The third characteristic feature is that the paper molded product 40 includes a cylindrical body portion 70 at one end which forms an opening 71, as shown in Figure 6, for example; the plastic molded product 30 includes a lid portion 50 that opens and closes the mouth 21 of the container 20 to which the cap 10 is attached, and a joint portion 60 that joins with the paper molded product 40; and the anti-detachment portion a is located on the outer surface of the joint portion 60 facing the inner surface of the cylindrical body portion 70 and includes a projection 61 that protrudes toward the inner surface of the cylindrical body portion 70. (Effect of the third feature point) According to the third feature, the projection 61 of the joint 60 can be made to bite into the inner surface of the cylindrical part 70, for example as shown in Figure 6, thereby preventing the plastic molded product 30 from falling out of the opening 71 of the paper molded product 40.

[0065] (Fourth characteristic) The fourth characteristic feature is that the inner surface of the cylindrical portion 70 is provided with a mesh-like uneven surface 74, as shown in Figure 1, for example. (Effect of the fourth feature point) According to the fourth feature, the projection 61 of the joint 60 catches on the mesh-like uneven surface 74 of the cylindrical body 70, thereby more reliably preventing detachment.

[0066] (Fifth characteristic) The fifth characteristic feature is that the projection 61 is wedge-shaped, with the amount of protrusion gradually increasing as it approaches the opening 71, as shown in Figure 6, for example. (Effect of the fifth feature point) According to the fifth feature, since the projection 61 can be made wedge-shaped, it is difficult for the projection 61, which is embedded in the inner surface of the cylindrical body 70, to come loose.

[0067] (Sixth characteristic) The sixth characteristic feature is that the projection 61 protrudes diagonally outward as it approaches the opening 71 from the outer surface of the joint 60, as shown in Figure 7, for example. (Effect of the sixth feature point) According to the sixth feature, by making the projection 61 protrude at an angle, it becomes difficult for the projection 61, which has become embedded in the inner surface of the cylindrical body 70, to come loose.

[0068] (Seventh characteristic) The seventh characteristic feature is that the inner surface of the cylindrical portion 70 is formed in a polygonal or circular shape in plan view, as shown in Figures 8 to 10, for example; the joint portion 60 is formed in a polygonal or circular plate shape; and the protrusions 61 are formed on the outer surface of the joint portion 60 at positions that are equally spaced in the circumferential direction. (Effect of the seventh feature point) According to the seventh feature, for example, as shown in Figures 8 to 10, by forming multiple protrusions 61 on the outer surface of the joint 60 at positions equally spaced in the circumferential direction, and by evenly distributing the force of disengagement of the protrusions 61, it is possible to make it difficult for the protrusions 61 to come off.

[0069] (The eighth characteristic) The eighth characteristic feature is that the projection 61 has a thin hinge portion 62 between it and the joint portion 60, as shown in Figures 11 to 19, for example. (Effect of the eighth feature point) According to the eighth feature, the thin-walled hinge portion 62 can be used to press the projection portion 61 toward the inner surface of the cylindrical portion 70, thereby improving the ability of the cap 10 to follow deformation.

[0070] (9th characteristic) The ninth characteristic feature is that, as shown in Figures 13 to 19, for example, multiple projections 61 are formed at equal intervals along the entire circumference of the joint 60, and a connecting portion 64 is provided to connect adjacent projections 61 in a skirt-like manner in the circumferential direction of the joint 60. (Effect of the 9th feature point) According to the ninth feature, by connecting the projection 61 in a skirt-like manner via the connecting portion 64, the ability of the cap 10 to follow deformation can be improved.

[0071] (Tenth characteristic) The tenth characteristic feature is that the paper molded product 40 comprises, for example, a cylindrical body portion 70 with one end forming an opening 71 and a top plate portion 72 that closes the other end of the cylindrical body portion 70, as shown in Figures 20 to 22, and the plastic molded product 30 comprises a lid portion 50 that opens and closes the mouth portion 21 and a joint portion 60 that joins with the paper molded product 40, and a paper tube portion 80 which serves as a fall-prevention portion a, having an open top and bottom surface and being hollow cylindrical, is fitted into the inner circumferential surface of the cylindrical body portion 70, and the outer circumferential surface of the paper tube portion 80 is in contact with the inner circumferential surface of the cylindrical body portion 70, preventing axial movement by frictional resistance, and the peripheral edge of the joint portion 60 is located between one end surface and the top plate portion 72. (Effect of the 10th feature point) According to the tenth feature, the paper tube section 80 prevents the plastic molded product 30 from falling off.

[0072] (The 11th characteristic) The eleventh characteristic feature is that the joint portion 60 has a spike portion 63 on the side facing away from the lid portion 50, as shown in Figure 21, which bites into the top plate portion 72. (Effect of the 11th feature point) According to the eleventh feature, the spike portion 63 of the joint portion 60 bites into the top plate portion 72, thereby ensuring that the paper tube portion 80 and the plastic molded product 30 can rotate together reliably.

[0073] (The 12th characteristic) The twelfth characteristic feature is that the joint 60 is sandwiched between the top plate portion 72 and the end face of the paper tube portion 80, as shown in Figures 20 to 22, for example. (Effect of the 12th feature point) According to the twelfth feature, by sandwiching the joint 60 between the top plate portion 72 and the end face of the paper tube portion 80, and by using the paper tube portion 80, it is possible not only to prevent the plastic molded product 30 from falling off, but also to restrict the range of movement of the joint 60 to a certain range.

[0074] (13th characteristic) The thirteenth characteristic feature is that, as shown in Figures 22(A) and 22(B), the paper tube section 80 is fixed to the inner surface of the cylindrical section 70 at a position where the joint 60 is movable in the axial direction of the cylindrical section 70 between the top plate section 72 and the end face of the paper tube section 80. The top plate section 72 and the joint 60 facing the top plate section 72 each have either a recess 75 or a protrusion 65 that fits into each other, and the height of the protrusion 65 is such that when the joint 60 is moved furthest toward the paper tube section 80, the protrusion 65 is completely detached from the recess 75. (Effect of the 13th feature point) According to the 13th feature, by using the paper tube section 80, it is possible to easily realize a cap that cannot be opened or closed unintentionally by children, such as a childproof cap, which prevents accidental operation.

[0075] (The 14th characteristic) The fourteenth characteristic feature is that the cap 10 is fitted onto the mouth 21 of a container 20 to which the cap 10 is attached, comprising a plastic molded product 30 and a paper molded product 40 which is molded using paper as the main material, as shown in Figures 20 to 22, and into which the plastic molded product 30 fits inside from the opening 71 and which is rotatable integrally with the plastic molded product 30, and the paper molded product 40 comprises a cylindrical body portion 70 at one end which forms the opening 71, a top plate portion 72 which closes the other end of the cylindrical body portion 70, and a cylindrical paper tube portion 80 which is located on the inner circumferential surface of the cylindrical body portion 70, has an outer diameter less than or equal to the inner diameter of the cylindrical body portion 70 and overlaps the cylindrical body portion 70 both internally and externally, and the wall thickness of the paper tube portion 80 is greater than or equal to the wall thickness of the cylindrical body portion 70. (Effect of the 14th feature point) According to the 14th characteristic, the rigidity of the cylindrical body 70 can be easily improved by using the paper tube section 80.

[0076] (15th characteristic) The 15th characteristic feature is that, as shown in Figure 23 for example, the tube container 100 includes a cap 10 and comprises a tubular body 110 with one end closed and a mouth 21 attached to the other end of the body, as shown in Figures 2 and 23 for example, the body 110 being made of a paper-based material. (Effect of the 15th feature point) According to the 15th feature, a cap 10 that fits the tube container 100 can be provided. [Explanation of Symbols]

[0077] 10 caps 20 containers 21 Mouth 30 Plastic molded products 40 Paper molded products 50 Lid portion 51 Screw section 60 Joint 61 Protrusion 62 Hinge section 63 Spikes 64 Connecting part 65 Convex part a Falling prevention part 70 Cylinder part 71 Opening 72 Top panel 73 Flange section 74 Uneven part 75 recess 80 Paper tube section 100 tube containers 110 Torso 120 Pour cylinder part 130 Overhang 111 End of the torso 140 seats 141 Paper layer 142 Substrate film layer 143 Barrier layer 144 Sealant layer 145 Paper protective layer 146 Ink Layer 147 Overcoat varnish layer

Claims

1. A cap comprising a plastic molded product and a paper molded product that engages with the plastic molded product from the inside through an opening, The plastic molded product is provided with a fall prevention part to prevent it from falling out of the opening, The aforementioned paper molded product comprises a cylindrical portion at one end which forms the opening, and a top plate portion that closes the other end of the cylindrical portion. The plastic molded product comprises a lid portion that opens and closes the mouth of the container to which the cap is attached, and a joint portion that joins with the paper molded product, The cap is characterized in that the lid portion has a screw portion on its inner surface which is a female screw corresponding to a male screw formed on the outer surface of the opening portion.

2. The cap according to claim 1, wherein the material of the paper molded product exceeds 50% by mass of the total material of the cap.

3. The cap according to claim 1 or claim 2, wherein the fall prevention portion is located on the outer surface of the joint portion facing the inner surface of the cylindrical portion and comprises a projection that protrudes toward the inner surface of the cylindrical portion.

4. The cap according to claim 3, wherein the inner surface of the cylindrical portion is provided with a mesh-like uneven surface.

5. The cap according to claim 3, wherein the projection is wedge-shaped and the amount of protrusion gradually increases as it approaches the opening.

6. The cap according to claim 3, wherein the projection protrudes diagonally from the outer surface of the joint so as it approaches the opening.

7. The inner surface of the cylindrical portion is formed in a polygonal or circular shape when viewed from above. The aforementioned joint is formed in the shape of a polygon or circular plate, The cap according to claim 3, wherein the protrusions are formed on the outer surface of the joint at positions that are equally spaced in the circumferential direction.

8. The cap according to claim 3, wherein the projection is provided with a thin-walled hinge portion between it and the joint portion.

9. Multiple protrusions are formed at equal intervals along the entire circumference of the joint, The cap according to claim 7, further comprising a connecting portion that connects adjacent protrusions to each other in a skirt-like manner in the circumferential direction of the joint portion.

10. The paper tube portion, which serves as the fall-prevention portion and is hollow and cylindrical with open top and bottom surfaces, is fitted into the inner circumferential surface of the cylindrical portion. The cap according to claim 1, wherein the outer surface of the paper tube portion is in contact with the inner surface of the cylindrical portion, preventing axial movement due to frictional resistance, and the peripheral edge of the joint portion is located between one end face and the top plate portion.

11. The cap according to claim 10, wherein the joint portion has a spike portion on the surface facing away from the lid portion that bites into the top plate portion.

12. The cap according to claim 10, wherein the joint is sandwiched between the top plate portion and the end face of the paper tube portion.

13. The paper tube portion is fixed to the inner circumferential surface of the cylindrical portion at a position where the joint portion is movable in the axial direction between the top plate portion and the end face of the paper tube portion. The cap according to claim 10, wherein the top plate portion and the joint portion facing the top plate portion each have either a recess or a protrusion that fits together with each other, and the height of the protrusion is such that the protrusion is completely detached from the recess when the joint portion is moved to the position closest to the paper tube portion.

14. A cap comprising a plastic molded product and a paper molded product that engages with the plastic molded product from the inside through an opening, The aforementioned paper molded product comprises a cylindrical portion at one end which forms the opening, a top plate portion which closes the other end of the cylindrical portion, and a cylindrical paper tube portion located on the inner circumferential surface of the cylindrical portion, having an outer diameter less than or equal to the inner diameter of the cylindrical portion, and overlapping the cylindrical portion both internally and externally. The wall thickness of the paper tube portion is greater than or equal to the wall thickness of the cylindrical portion. The plastic molded product comprises a lid portion that opens and closes the mouth of the container to which the cap is attached, and a joint portion that joins with the paper molded product, The cap is characterized in that the lid portion has a screw portion on its inner surface which is a female screw corresponding to a male screw formed on the outer surface of the opening portion.

15. The cap according to claim 1 or 14, wherein the entire surface of the joint facing the top plate portion is covered by the top plate portion.

16. A tube container comprising a cap according to claim 1 or 14, It comprises a tubular body with one end closed and a spout attached to the other end of the body, A tube container in which the body is formed from a material mainly composed of paper.

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