Hinged caps and capped tubes

Abstract

To provide a hinged cap allowing for inhibiting a content from leaking out and enhancing the sense of use during opening and closing, and a capped tube container using such a cap.SOLUTION: A hinged cap 1 is attached to a tube container 70 comprising a mouth 76 as a delivery port so as to plug the mouth 76. The hinged cap 1 is characterized in that the cap 1 is made up by mixing polypropylene and polyethylene together and the content by percentage of polypropylene is 30 mass% or higher and 70 mass% or lower.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hinged cap suitable for use with tube containers and the like, and to a tube container with a cap using such a cap. [Background technology]

[0002] Conventionally, the head (pouring outlet) and cap of a tube container body are generally formed by compression molding or injection molding using thermoplastic resins such as polyolefin. For example, the head of a tube container body is formed from a resin such as polyethylene, and the cap is formed from a resin such as polypropylene (PP).

[0003] When contents filled into tube containers are relatively low in viscosity, such as semi-liquid pastes or oil-containing contents like seasonings, the contents may seep out from the gap between the spout and the cap even when the cap is closed. For this reason, a tube container has been disclosed in which the main component of the cap is polyethylene (PE), thereby increasing the torque required to open the cap and preventing the contents from leaking out (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-167860 Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, as a cap for a tube container, a hinged cap in which the cap body and the lid portion are connected by a hinge is also used. A hinged cap is convenient because, if the cap body is attached to a tube container, the contents can be dispensed by simply swinging the hinge to open the lid portion during use. However, when the main component of the cap is polyethylene as in the conventional technology, the hinge is also made of polyethylene, which means that it does not respond sufficiently to the opening and closing operation of the lid portion, making it difficult for the user to feel comfortable when using the cap.

[0006] Therefore, an object of the present invention is to provide a hinged cap that can prevent leakage of contents and improve usability when opening and closing, and a capped tube container that uses such a cap. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A hinged cap that is attached to a tube container having a mouth portion that is a discharge outlet and closes the mouth portion, The hinged cap is characterized in that the cap is made of a mixture of polypropylene and polyethylene, and the content of the polypropylene is 30% by mass or more and 70% by mass or less.

[0008] The hinged cap of the present invention also includes: The polyethylene is characterized in that it is a high-density polyethylene.

[0009] The hinged cap of the present invention also includes: The polyethylene contained in the cap is characterized in that it contains biomass-derived polyethylene obtained by polymerizing a monomer containing biomass-derived ethylene.

[0010] The present invention also provides the hinged cap; a tube container having the mouth portion, a body portion of which is a laminate including at least a first sealant layer, a base layer, and a second sealant layer, and the body portion and a shoulder portion are joined together; The present invention provides a tube container with a cap, comprising:

[0011] The capped tube container of the present invention further comprises: The polyethylene constituting the mouth portion is high-density polyethylene. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a hinged cap that can prevent leakage of contents and improve usability when opening and closing, and a capped tube container that uses such a cap. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a front view of a tube container with a hinged cap attached. [Figure 2] FIG. 1 is a front view of a packaged product of a tube container containing contents. [Figure 3] 1 is a top view of a cap 1 according to an embodiment of the present invention. [Figure 4] 1 is a side view of a cap 1 according to an embodiment of the present invention. [Figure 5] FIG. 1 is a bottom view of a cap 1 according to an embodiment of the present invention. [Figure 6] FIG. 4 is a cross-sectional view taken along line AA (center line) in FIG. [Figure 7] 1 is a diagram showing a cylindrical body portion of a tube container according to an embodiment of the present invention. FIG. [Figure 8] 1 is a cross-sectional view of a laminate of a body portion of a tube container according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the present invention is not limited to these specifically exemplified forms or various specifically described structures. In each drawing, the size and proportions of components may be changed or exaggerated for ease of understanding. Also, for clarity, unnecessary parts for explanation or repeated reference numerals may be omitted.

[0015] In this specification, the terms "outer surface" and "inner surface" refer to the "outer surface" and "inner surface" when the tube container 70 is produced using the laminate 90. Furthermore, with regard to the terms "upper side" and "lower side," the "upper side" refers to the mouth 76 side and the cap 1 side, based on the state in which the tube container 70 is held with the mouth 76 and the cap 1 facing upward, and the "lower side" refers to the opposite side of the mouth 76 (the 74B side in FIG. 1 and the 79 side in FIG. 2).

[0016] FIG. 1 is a partial cross-sectional view of a tube container with a hinged cap according to this embodiment attached. FIG. 2 is a partial cross-sectional view of a packaged tube container containing contents. As shown in FIGS. 1 and 2, a tube container 70 according to this embodiment includes a body 71 made of a laminate 90 and a head molded body 78 made by applying a synthetic resin to the body 71 by a method such as compression molding or injection molding. The head molded body 78 further includes a shoulder 75 and a mouth 76. A hinged cap 1 is attached to the mouth 76 of the tube container 70 to prevent leakage of the contents from the discharge opening of the mouth 76. The head molded body 78 forms a head having the mouth 76, which is the discharge opening, and is connected to the body 71 to form the tube container 70.

[0017] The tube container 70 has a head molded body 78 composed of a cylindrical mouth 76 including a discharge port, which is an opening for dispensing, and a truncated cylindrical shoulder 75 connected to the mouth 76 and whose outer circumference widens downward. In FIGS. 1 and 2, a cross-sectional view of the cap 1 attached to the head molded body 78 is shown. Also, in FIGS. 1 and 2, the cap 1 is in a closed state. As will be described in detail later, the cap 1 includes a cap body 10 and a lid 30. The state in which the lid 30 is fitted to the cap body 10 is referred to as a closed state, and the state in which the lid 30 is removed from the cap body 10 is referred to as an open state. The shoulder 75 is configured, for example, in a truncated cone shape that widens radially outward from the tube container 70 as it moves away from the mouth 76. For example, the shoulder 75 is inclined at 30 degrees relative to the horizontal. The shoulder 75 is connected to the body 71 at its lower side.

[0018] The substantially cylindrical mouth portion 76 has a helical screw structure 77 on its outer surface that functions as a screw thread. The inner peripheral surface of the mouth portion 76 forms the outer edge of the opening. The opening of the mouth portion 76 serves as a discharge port for discharging the contents. The contents contained in the body portion 71 are discharged from the tube container 70 by passing through the opening of the mouth portion 76. Because the head molded body 78 has the structure described above, it can be threadedly engaged with the cap 1, which has a helical screw structure 24 on the inside that functions as a screw groove, and is therefore detachable.

[0019] Fig. 3 is a top view showing an example of the cap 1 according to the present embodiment, Fig. 4 is a side view of the cap 1 according to the present embodiment, Fig. 5 is a bottom view of the cap 1 according to the present embodiment, and Fig. 6 is a cross-sectional view taken along line AA in Fig. 3. For ease of explanation, in accordance with the vertical direction of the entire tube container shown in Figs. 1 and 2, the nozzle 11 side serving as the spout of the cap body 10 in Fig. 4 will be referred to as the upper side, and the barrel 14 side as the lower side. Furthermore, line AA in Fig. 3 is a center line connecting the centers of the cap body 10, hinge 50, and lid portion 30 of the cap 1, and Fig. 6 is a vertical cross-sectional view taken along the center line (line AA) of the cap 1.

[0020] As shown in Figures 3 to 6, the cap 1 according to this embodiment is a hinged cap, and includes a cap body 10, a lid portion 30, and a hinge 50, and is symmetrical about line AA. The cap body 10 has a nozzle 11 as a pouring outlet, and is cylindrical with a top, including a substantially circular base plate 12 in a plan view and a substantially cylindrical body portion 14 that hangs down from an inner surface 13 along the outer edge of the base plate 12. The lid portion 30 is cylindrical with a top, including a substantially circular closure plate 31 in a plan view and a substantially cylindrical side portion 33 that hangs down from an inner surface 32 along the outer edge of the closure plate 31. The lid portion 30 is connected to the cap body 10 via the hinge 50, with the open end of the side portion 33 positioned upward.

[0021] The cap 1 is configured such that a cap body 10 is attached to a tube container 70, and the contents contained in the tube container 70 are poured from the tip of a nozzle 11 serving as a pouring outlet. The cap 1 is also configured such that the lid portion 30 can swing relative to the cap body 10 via a hinge 50, and by placing the lid portion 30 over the cap body 10 so as to cover it from above and fitting the lid portion 30 to the cap body 10, the nozzle 11 serving as a pouring outlet is closed by the lid portion 30, thereby closing the pouring outlet. In other words, the hinge 50 connects the lid portion 30 to the cap body 10 so that the lid portion 30 can swing between a closed state in which the nozzle 11 is covered by the lid portion 30, and an open state in which the nozzle 11 is open.

[0022] The structure of the cylindrical cap body 10 having a base plate 12 and a body portion 14 will now be described in detail. The base plate 12 is a generally circular plate-like member whose center is located on the center line A in a plan view. The generally cylindrical body portion 14 is vertically attached to the base plate 12, extending downward from the inner surface 13 along the outer edge. An inwardly recessed portion 15 is formed on the side of the cylindrical cap body 10 opposite the hinge 50. The recessed portion 15 is formed from the end of the base plate 12 to the body portion 14, and extends downward from the outer surface 16 of the base plate 12 (the cylindrical axis direction of the body portion 14: the back side in Figure 3, the lower side in Figure 4). The recessed portion 15 forms a flat surface that extends vertically and in the left-right direction on the outer peripheral surface of the body portion 14. The base plate 12 is generally circular and symmetrical about the center line (line AA) in plan view, with the side opposite the hinge 50 cut out, and the cap body 10 is generally cylindrical and symmetrical about the center line. The outer diameter of the body 14 is generally circular and is approximately the same as the outer diameter of the side portion 33 of the lid 30.

[0023] The base plate 12 has a stepped portion 17 recessed from the outer surface 16 toward the inner surface 13 around the entire periphery of its outer edge. The bottom surface of the stepped portion 17 is a horizontal plane. The radial width and vertical depth of the stepped portion 17 are approximately constant in the circumferential direction. The base plate 12 also has a locking rib 18 that protrudes upward and radially outward from the outer surface 16 around the entire periphery of the inner peripheral edge of the stepped portion 17. An annular locking protrusion 19 that protrudes outward is formed on the upper portion of the outer periphery of the locking rib 18. The locking rib 18 locks with an engaging rib 39 on the lid portion 30, which will be described later. The engaging rib 39 is engaged with the locking rib 18, thereby locking the lid portion 30 to the cap body 10. Furthermore, as will be described in detail later, the peripheral surface at the outermost end of the locking protrusion 19 corresponds to the inner peripheral surface of the side portion 33 of the lid portion 30, which will be described later, and abuts against the inner peripheral surface of the side portion 33 in a closed state where the lid portion 30 is fitted into the cap body 10. One end of a hinge 50 is connected to the outer edge of the base plate 12 and the upper end of the body portion 14. The lid portion 30 is connected to the other end of the hinge 50, and the lid portion 30 is swingably connected to the cap body 10 via the hinge 50.

[0024] The nozzle 11 is cylindrical and comprises a lower tube portion 20 having a truncated cone shape tapering upward from the outer surface 16 of the base plate 12, and a cylindrical upper tube portion 21 connected to the upper end of the lower tube portion 20. In a plan view, the nozzle 11 is disposed at a position offset from the center of the base plate 12 by a predetermined distance toward the recess 15. The interior of the nozzle 11 penetrates the base plate 12 and communicates with the interior of the body portion 14. The contents can be dispensed from the tip of the nozzle 11, which serves as a dispensing outlet. A restricting plate 22 is formed on the inner circumferential surface of the upper tube portion 21 of the nozzle 11, with a through-hole remaining near the center. The restricting plate 22 is a plate-like member whose inner edge surrounding the through-hole is circular and whose outer edge forms the inner circumferential surface of the upper tube portion 21. The restricting plate 22 is used to adjust the dispensing condition, such as the amount of liquid or viscous contents dispensed from the nozzle 11, and is configured to narrow the interior of the nozzle 11 through which the contents pass. By simply changing the size of the restricting plate 22 according to the viscosity of the contents, etc., the pouring amount can be adjusted to suit the contents, making it highly versatile.

[0025] The cap body 10 also has a cylindrical mounting portion 23 that extends downward (in the direction of the cylindrical axis of the body 14: the front side in Fig. 5, the bottom side in Fig. 6) from the inner surface 13 of the substrate 12. As shown in Fig. 5, the mounting portion 23 is formed at a position concentric with the cylindrical axis of the body 14, and the inside of the mounting portion 23 communicates with the inside of the nozzle 11. A screw structure 24 is formed on the inner peripheral surface of the mounting portion 23.

[0026] Here, the attachment part 23 is screwed onto the cylindrical mouth part 76 of the tube container 70, and the cap body 10 is attached to the tube container 70 by screwing the attachment part 23 onto the mouth part 76 of the tube container 70. The contents contained inside the tube container 70 pass from the mouth part 76 through the inside of the nozzle 11 serving as a pouring outlet and are poured out from the tip of the nozzle 11.

[0027] The cap body 10 also has six reinforcing ribs 25 that protrude outward from the outer peripheral surface of the mounting portion 23 and extend downward from the inner surface 13 of the substrate 12. The six reinforcing ribs 25 are arranged at approximately equal intervals in the circumferential direction. The six reinforcing ribs 25 improve the rigidity of the cylindrical mounting portion 23. Note that the reinforcing ribs 25 are not limited to the above-described configuration. For example, the reinforcing ribs 25 may be formed in a plate shape that extends from the outer peripheral surface of the mounting portion 23 to the inner periphery of the body portion 14.

[0028] 5 and 6, the cap body 10 has an inner ring 27 and a contact ring 28 that are vertically disposed downward (the cylindrical axis direction of the body portion 14: the front side in FIG. 5, the bottom side in FIG. 6) from the inner surface 13 of the substrate 12. As shown in FIG. 5, the inner ring 27 and the contact ring 28 are concentric with the cylindrical axis of the body portion 14 and the mounting portion 23, and are formed at a position inside the mounting portion 23. The inner ring 27 is located inside the contact ring 28.

[0029] The inner ring 27 is a part that is inserted inside the mouth portion 76 of the tube container 70 when the cap 1 is attached to the tube container 70. Therefore, when attached, the inner ring 27 and the attachment portion 23 sandwich the peripheral wall of the mouth portion 76. The vertical length of the inner ring 27, i.e., the length extending downward from the inner surface 13 (the cylindrical axis direction of the body portion 14: the front side in Figure 5, the bottom side in Figure 6), is about one-third of the length of the attachment portion 23.

[0030] The contact ring 28 is a part that holds down the upper part of the mouth 76 of the tube container 70 when the cap 1 is attached to the tube container 70. By having the contact ring 28 hold down the upper part of the mouth 76, there is no gap between the contact ring 28 and the upper part of the mouth 76, and leakage of the contents can be prevented. In a plan view as shown in FIG. 5, the contact ring 28 is located on the outer periphery side of the inner ring 27 and on the inner periphery side of the attachment portion 23. The diameter of the contact ring 28 is approximately the same as the diameter of the mouth 76 of the tube container 70. The contact ring 28 is a slight protrusion, and the length of the inner ring 27 in the vertical direction is approximately 1 mm.

[0031] Additionally, the cap body 10 has a thick portion 26 that protrudes inward from the joint between the inner surface 13 of the base plate 12 and the inner peripheral surface of the body 14, below the portion where the hinge 50 is connected. This thick portion 26 improves the rigidity of the portion of the cap body 10 where the hinge 50 is connected.

[0032] Next, the configuration of the cylindrical lid 30 having the closure plate 31 and the side portion 33 will be described in detail. The closure plate 31 is a generally circular plate-like member whose center is located on the centerline in a plan view. The closure plate 31 is convexly curved from the outer surface 34 toward the inner surface 32, protruding toward the inner surface 32. On the other hand, the annular portion near the outer edge of the outer surface 34 of the closure plate 31 is not curved toward the inner surface 32 but is formed as a flat surface. The cylindrical lid 30 also has a generally cylindrical side portion 33 that extends upward from the inner surface 32 along the outer edge. An inwardly recessed recess 35 is formed on the side portion 33 of the cylindrical lid 30 opposite the hinge 50. The recess 35 is formed from the upper end to the lower end of the side portion 33. The recess 35 forms a flat surface on the outer peripheral surface of the side portion 33 that is vertical and extends in a direction intersecting the direction connecting the cap body 10, the hinge 50, and the lid portion 30. Furthermore, on the closure plate 31 side where the recess 35 is formed, a protrusion 36 is formed where the closure plate 31 protrudes outward from the side portion 33. The recess 35 of the lid portion 30 corresponds to the recess 15 of the cap body 10, and the outer diameter of the side portion 33 of the lid portion 30 is approximately the same as the outer diameter of the trunk portion 14 of the cap body 10. Therefore, the lid portion 30 is a cylindrical shape with a top that is symmetrical about the center line and corresponds to the shape of the cap body 10.

[0033] The lid portion 30 has an annular first closure rib 37 that protrudes upward from the inner surface 32 of the closure plate 31. The first closure rib 37 corresponds to the nozzle 11 of the cap body 10 and is formed at a position eccentric by a predetermined distance from the center of the closure plate 31 toward the recess 35. The inner diameter of the first closure rib 37 is approximately the same as the outer diameter of the upper tube portion 21 of the nozzle 11. The lid portion 30 also has an annular second closure rib 38 that protrudes upward from the inner surface 32 of the closure plate 31, similar to the first closure rib 37. The second closure rib 38 is formed at a position concentric with the first closure rib 37 and corresponds to the nozzle 11 of the cap body 10. The outer diameter of the second closure rib 38 is approximately the same as the inner diameter of the circular through-hole that forms the inner edge of the restricting plate 22 of the nozzle 11. The upward protrusion height of the second closure rib 38 is greater than the upward protrusion height of the first closure rib 37. As will be described in detail later, when the lid portion 30 is fitted to the cap body 10, the second closure rib 38 is inserted into the upper tubular portion 21 of the nozzle 11, and the upper tubular portion 21 of the nozzle 11 is inserted into the first closure rib 37. In other words, the upper tubular portion 21 of the nozzle 11 is fitted into the annular gap formed between the first closure rib 37 and the second closure rib 38, and the tip of the nozzle 11 is plugged.

[0034] Furthermore, on the side opposite to the side portion 33 where the recess 35 is formed, an engagement rib 39 is formed protruding inward from the inner peripheral surface. The engagement rib 39 extends along the side portion 33 in a direction perpendicular to the center line. Here, the engagement rib 39 corresponds to the locking rib 18 of the cap body 10. When the lid portion 30 is fitted to the cap body 10, the engagement rib 39 and the locking rib 18 engage with each other, and the lid portion 30 is locked to the cap body 10.

[0035] The hinge 50 is formed between the capped cylindrical cap body 10 and the capped cylindrical lid portion 30, and comprises a pair of block portions 51a, 51b and a thin-film portion that connects the cap body 10 and the lid portion 30, and has a symmetrical structure with respect to the center line.

[0036] In this embodiment, a mixture of polypropylene and polyethylene is used as the thermoplastic resin material for the cap 1. The polypropylene content is preferably 30% by mass or more and 70% by mass or less (30% to 70% by mass) of the thermoplastic resin material for the cap 1. If the polypropylene content is less than 30% by mass, the elasticity of the hinge decreases, making it difficult to feel a clear connection and disconnection when opening and closing the cap. On the other hand, if the polypropylene content exceeds 70% by mass, the sealing ability of the nozzle and lid of the cap decreases, making the contents more likely to leak.

[0037] The polyethylene mixed with the thermoplastic resin that forms the material of the cap 1 can be at least one selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene. Alternatively, two or more selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene can be mixed. It is particularly preferable to use high-density polyethylene as the polyethylene. The use of high-density polyethylene improves drop strength in low-temperature environments.

[0038] High density polyethylene has a density of 0.941 g / cm 3 or more, preferably 0.941 g / cm 3 More than 0.965g / cm 3 It refers to polyethylene obtained by polymerizing ethylene using a low-pressure polymerization method (gas phase polymerization using a Ziegler-Natta catalyst or liquid phase polymerization using a metallocene catalyst). 3 More than 0.941g / cm 3 Low-density polyethylene refers to polyethylene obtained by polymerizing ethylene having a density of less than 0.93 g / cm. 3 less than 0.91 g / cm 3 More than 0.93g / cm 3The linear low-density polyethylene has a density of less than 0.93 g / cm and is obtained by polymerizing ethylene by high-pressure polymerization. 3 and preferably has a density of less than 0.91 g / cm 3 More than 0.93g / cm 3 It refers to a material obtained by polymerizing ethylene and a small amount of α-olefins by a low-pressure polymerization method. Conventionally, the head molded body 78 of the tube container 70 was made of polyethylene, but the cap 1 was made of polypropylene. One of the reasons for this was to ensure hinge elasticity when opening the cap.

[0039] The body 71 is formed by molding a film-like laminate into a cylindrical shape. One end of the cylindrical body 71 is joined to a shoulder 75. Meanwhile, the other end of the body 71 is sealed by a bottom seal 79, which is formed by overlapping and joining the inner surfaces of the cylindrical body 71 (see FIG. 2). The bottom seal 79 may be joined after the body 71 is filled with the contents. The body 71 of the tube container 70, in particular, is preferably configured to have flexibility (pliability, squeezability) that allows a desired amount of contents to be easily extruded, even if the contents have some viscosity. The dimensions of the body 71 may be designed appropriately depending on the type of contents, and may be, for example, 50 mm in diameter.

[0040] The tube container 70 having the above-described structure is obtained through the following manufacturing process. First, as shown in Figure 7, a pair of bonding ends (hereinafter sometimes referred to as both ends) 73A, 73B of the laminate 90 are overlapped using the laminate 90, and the outer and inner surfaces of the overlapping portions are heat-sealed and bonded together to form a body bonding portion 72, thereby producing a cylindrical body portion 71.

[0041] Heat sealing can be performed by a conventionally known method such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, or flame sealing.

[0042] Next, the cylindrical body 71 shown in Fig. 7 is placed in a mold (not shown), and the head molded body 78 (shoulder portion 75, mouth portion 76) shown in Fig. 1 is formed at one opening (upper side) 74A of the body 71 by a method such as compression molding or injection molding. In this way, the head molded body 78 (shoulder portion 75, mouth portion 76) is integrally molded at one opening (upper side) 74A of the body 71, thereby producing the tube container 70. Then, the cap 1 is attached to the mouth portion 76 side of the tube container 70.

[0043] Next, an appropriate amount of content, such as mustard paste, wasabi paste, toothpaste, or other contents, is filled into the tube container 70 from the other opening (lower side) 74B of the cylindrical body 71 shown in Fig. 1. Thereafter, the opening (lower side) 74B is welded to form the bottom seal portion 79 shown in Fig. 2. As a result, a packaged product 70A (see Fig. 2) is obtained, which includes the tube container 70 filled and packaged with the contents.

[0044] The details of the head molded body 78 will be further explained. The head molded body 78 is made of a material that can be molded so that the mouth portion 76 and shoulder portion 75 have appropriate hardness, has high adhesion to the material of the body portion 71, does not affect the quality of the contents, and does not cause hygienic problems even when it comes into contact with the contents. As such a material, a thermoplastic resin is used for the head molded body 78, and more specifically, high-density polyethylene (HDPE) is used.

[0045] Furthermore, the head molding 78 may be made of polyolefin resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and polypropylene (homopolypropylene, block polypropylene, random polypropylene); polyolefin resins such as copolymers of olefins with copolymerizable monomers such as vinyl monomers, acrylic monomers, and unsaturated carboxylic acids, or blends thereof; and resins in which the above-mentioned resins are blended with high-density polyethylene. Furthermore, from the standpoint of heat resistance and thermal adhesion to the body 71, it is preferable to use a resin in which high-density polyethylene is blended with linear low-density polyethylene for the head molding 78. Furthermore, a truncated cone-shaped cylinder may be laminated on the shoulder 75 of the head molding 78, in particular, as a barrier material to prevent the permeation of gases such as oxygen. The shoulder 75 may also contain a plant-derived resin.

[0046] The high-density polyethylene used to form the cap 1 and the head molded body 78 may be derived from fossil fuels, but biomass-derived high-density polyethylene, known as a carbon-neutral material, may also be used to reduce the environmental impact. Because the head and cap account for a large mass proportion of the tube container, molding the cap 1 and the head molded body 78 using biomass-derived high-density polyethylene reduces the amount of fossil fuels used for the tube container as a whole, thereby reducing the environmental impact. Furthermore, the head molded body 78 of the tube container 70 is comparable in terms of physical properties, such as mechanical properties, to heads made from conventional fossil fuel-derived materials, making it possible to replace conventional heads.

[0047] From the perspective of reducing environmental impact, it is preferable to use only biomass-derived polyethylene. However, considering production costs and other factors, a blend of fossil-derived polyethylene and biomass-derived polyethylene may also be used. Here, biomass-derived polyethylene is a monomer polymer containing biomass-derived ethylene. Because biomass-derived ethylene is used as the raw material monomer, the polymerized polyethylene is biomass-derived. The content of biomass-derived ethylene in the raw material monomer does not need to be 100% by mass, but is preferably 10% by mass or more, and more preferably 30% by mass or more. The raw material monomer may contain fossil-derived ethylene or an α-olefin monomer such as butylene, hexene, or octene. Even in such a case, the resulting polymer is called biomass polyethylene. When biomass-derived polyethylene is used, it may contain two or more polyolefins with different biomass contents. Furthermore, when blending fossil-derived polyethylene and biomass-derived polyethylene, the mixing method is not particularly limited, and dry blending or melt blending may be used. When the two are mixed, the mixing ratio of the fossil-derived polyethylene to the biomass-derived polyethylene is preferably 1:9 to 9:1 by mass, and more preferably 2:8 to 8:2.

[0048] For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from plant raw materials. That is, it is preferable to use plant-derived resins. The plant raw material is not particularly limited, and conventionally known plants can be used. Examples include corn, sugarcane, beet, and manioc.

[0049] In the present invention, biomass-derived fermented ethanol refers to ethanol produced by contacting a culture solution containing a carbon source obtained from plant raw materials with an ethanol-producing microorganism or a product derived from its disruption, and then purifying the ethanol. Conventional methods such as distillation, membrane separation, and extraction can be used to purify ethanol from the culture solution. Examples of such methods include adding benzene, cyclohexane, or the like and removing water by azeotropy or membrane separation.

[0050] It is preferable to use a high biomass content of biomass-derived high-density polyethylene. The biomass content is the value of the C14 content obtained by the radiocarbon (C14) measurement method according to ASTM-D6866. Atmospheric carbon dioxide contains a certain proportion of C14 (105.5 pMC), and it is known that the C14 content in plants that grow by absorbing atmospheric carbon dioxide, such as corn, is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, the proportion of biomass-derived carbon can be calculated by measuring the proportion of C14 in the total carbon atoms in the polyester.

[0051] The thickness of the head molded body 78 using such resins is preferably 0.5 mm or more and 2.0 mm or less. In this embodiment, the head molded body 78 is produced by compression molding. Therefore, in the head molded body 78, which is a compression molded product, it is possible to prevent depressions, so-called sink marks, that occur due to shrinkage during molding, even in thick portions such as the top surface. Furthermore, it is possible to reduce waste of material such as in gate portions. The head molded body 78 may also be produced by injection molding.

[0052] Next, a laminate 90 forming the cylindrical body 71 will be described with reference to FIG. 8 . The laminate 90 forming the body 71 of the tube container 70 is a laminate having a first sealant layer 92, a base layer 93, a barrier layer 94, and a second sealant layer 95, which are arranged in this order from the outer surface to the inner surface, as shown in FIG. 8 . The first sealant layer 92, the base layer 93, the barrier layer 94, and the second sealant layer 95 actually have different thicknesses, but for convenience, they are shown as having the same thickness in FIG. 8 . Furthermore, the adhesive layer formed during adhesion by dry lamination is thinner than the other layers and is therefore not shown. The barrier layer 94 is not an essential layer; it is sufficient that the laminate be formed by stacking at least the first sealant layer 92, the base layer 93, and the second sealant layer 95 in this order, with or without other layers sandwiched between them.

[0053] When forming the cylindrical body 71, the first sealant layer 92 and the second sealant layer 95 are directly bonded to each other at both ends of the laminate 90 to form the body bonding portion 72. An inner surface printed portion 13A containing a desired pattern is formed on the inner surface of the base layer 93 using printing ink. Alternatively, an outer surface printed portion containing a desired pattern may be formed on the outer surfaces of the first sealant layer 92 and the base layer 93 using printing ink.

[0054] The first sealant layer 92 and the base material layer 93 are bonded together by dry lamination using an adhesive. The base material layer 93 and the barrier layer 94 are bonded together by dry lamination. The barrier layer 94 and the second sealant layer 95 are bonded together by dry lamination. The first sealant layer 92, the base material layer 93, the barrier layer 94, and the second sealant layer 95 may be bonded together by extrusion lamination instead of dry lamination.

[0055] When two layers are bonded by dry lamination, an adhesive layer can be formed by applying an adhesive to the surface of the layer to be laminated and drying it. Examples of adhesives that can be used include one-component or two-component curing or non-curing vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, and other solvent-based, water-based, or emulsion-based adhesives. Two-component curing adhesives can include cured products of polyols and isocyanate compounds. The laminating adhesive can be applied to the surfaces of the layers constituting the laminate by, for example, direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fountain coating, transfer roll coating, or other methods.

[0056] Thermoplastic resins used in extrusion lamination include polyethylene, polypropylene, and cyclic polyolefin resins, as well as copolymers, modified resins, and mixtures (including alloys) based on these resins. Examples of polyolefin resins include the aforementioned polyethylene, polypropylene (PP), ethylene-α-olefin copolymers polymerized using metallocene catalysts, ethylene-polypropylene random or block copolymers, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, and ionomer resins. Acid-modified polyolefin resins, which are modified with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid to improve interlayer adhesion, can also be used.

[0057] Furthermore, resins obtained by graft polymerizing or copolymerizing unsaturated carboxylic acids, unsaturated carboxylic anhydrides, or ester monomers with polyolefin resins can be used. These materials can be used alone or in combination of two or more. Examples of cyclic polyolefin resins that can be used include cyclic polyolefins such as ethylene-propylene copolymers, polymethylpentene, polybutene, and polynorbornene. These resins can be used alone or in combination of two or more. Note that the biomass content can be further improved by using the above-mentioned polyethylene resins that use the above-mentioned biomass-derived ethylene as a monomer unit.

[0058] When laminating an adhesive resin layer using extrusion lamination, an anchor coat (AC) layer may be formed by applying and drying an anchor coat agent to the surface of the layer to be laminated. Examples of anchor coat agents include any resin with a heat resistance temperature of 135°C or higher, such as vinyl-modified resin, epoxy resin, urethane resin, polyester resin, or polyethyleneimine. In particular, anchor coat agents that are cured products of polyacrylic or polymethacrylic resins (polyols) containing two or more hydroxyl groups in their structure and an isocyanate compound as a curing agent are preferred. A silane coupling agent may also be used as an additive, and soluble nitrocellulose may also be used to enhance heat resistance.

[0059] The anchor coat layer after drying has a thickness of 0.1 μm to 1 μm, preferably 0.3 μm to 0.5 μm. The adhesive layer after drying has a thickness of preferably 1 μm to 10 μm, preferably 2 μm to 5 μm. The adhesive resin layer has a thickness of preferably 5 μm to 50 μm, preferably 10 μm to 30 μm.

[0060] Next, the materials of each part constituting the laminated body 90 of the cylindrical body portion 71 will be described. The first sealant layer 92 and the second sealant layer 95 may include, for example, polyethylene (PE). Specifically, the first sealant layer 92 and the second sealant layer 95 may be made from the following materials:

[0061] The first sealant layer 92 and the second sealant layer 95 may be made of any material that can be melted and fused to each other by heat, and examples of resins that can be used include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like, polyvinyl acetate resins, polyester resins, polystyrene resins, and the like.

[0062] Furthermore, a polyethylene terephthalate (hereinafter abbreviated as PET) layer can be used as the base material layer 93, and an inner surface printed portion 13A made of printing ink can be provided on the base material layer 93 by printing on the base material layer 93. Furthermore, the base material layer 93 in the laminate 90 is responsible for maintaining the rigidity of the body 71 of the tube container 70.

[0063] Instead of using a PET layer as the base layer 93, a nylon layer may be used, or a PET layer having a metal vapor deposition film on at least one surface and gas barrier properties may be used, or a nylon layer having a metal vapor deposition film on at least one surface and gas barrier properties may be used.

[0064] Alternatively, a PET layer having a silica vapor deposition film on at least one surface thereof and gas barrier properties may be used, or a nylon layer having a silica vapor deposition film on at least one surface thereof and gas barrier properties may be used.

[0065] Alternatively, a PET layer having an aluminum oxide vapor deposition film on at least one surface thereof and gas barrier properties may be used, or a nylon layer having an aluminum oxide vapor deposition film on at least one surface thereof and gas barrier properties may be used.

[0066] Nylon layers often have better mechanical strength than PET layers, and films with various vapor-deposited layers have better gas barrier properties than base films.

[0067] An appropriate material can be selected for the barrier layer 94 depending on the required function, such as barrier properties against water vapor and other gases, and an ethylene-vinyl alcohol copolymer film, a vapor-deposited film, or a metal foil can be used. When a metal foil is used as the barrier layer 94, various metal foils having barrier properties, such as copper and tin foils, can be used, but aluminum foil is preferably used.

[0068] When a vapor-deposited film is used as the barrier layer 94, polyethylene terephthalate (PET), nylon, etc. can be used as the base film of the vapor-deposited film. The metal to be vapor-deposited on the base film can be any of a variety of materials commonly used in metal vapor deposition, such as aluminum, copper, and tin. It is also possible to provide a vapor-deposited film of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide.

[0069] When a vapor-deposited film is used as the barrier layer 94, a PET layer having a metal vapor-deposited film on at least one side and gas barrier properties may be used, or a nylon layer having a metal vapor-deposited film on at least one side and gas barrier properties may be used.

[0070] Alternatively, a PET layer having a silica vapor deposition film on at least one surface thereof and gas barrier properties may be used, or a nylon layer having a silica vapor deposition film on at least one surface thereof and gas barrier properties may be used.

[0071] Alternatively, a PET layer having an aluminum oxide vapor deposition film on at least one surface thereof and gas barrier properties may be used, or a nylon layer having an aluminum oxide vapor deposition film on at least one surface thereof and gas barrier properties may be used.

[0072] Nylon layers often have better mechanical strength than PET layers, and films with various vapor-deposited layers have better gas barrier properties than base films.

[0073] Furthermore, a gas barrier coating film may be provided on the vapor-deposited film, which not only suppresses the permeation of oxygen and water vapor, but also effectively prevents cracks from occurring in the vapor-deposited film by providing the coating film adjacent to the vapor-deposited film.

[0074] The gas barrier coating film is a gas barrier coating film containing at least one resin composition such as a hydrolyzate of a metal alkoxide or a hydrolysis condensate of a metal alkoxide, which is obtained by polycondensing a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel catalyst, water, an organic solvent, etc.

[0075] The resins used in the first sealant layer 92 and the second sealant layer 95 may be not only those derived from fossil fuels but also biomass-derived resins. For example, in addition to the biomass-derived polyethylene resin described above, biomass polyesters using biomass-derived ethylene glycol as a diol component, as described in JP 2012-116082 A, polylactic acid resins, cellophane, starch, cellulose, etc. are usable. As the biomass-derived resin, plant-derived resins are preferably used.

[0076] The inner surface printed portion 13A provided on the inner surface of the base material layer 93 is printed on the base material layer 93, which is smooth and has excellent transparency, and therefore it is possible to perform printing that is excellent in aesthetic appeal.

[0077] Next, a method for manufacturing the laminate 90 of the cylindrical body portion 71 will be described with reference to FIG. First, printing is performed on the inner surface of the base material layer 93 to provide the inner surface printed portion 13A made of printing ink on the inner surface of the base material layer 93.

[0078] Next, the first sealant layer 92 is laminated on the outer surface of the base material layer 93 by dry lamination.

[0079] Next, the barrier layer 94 is laminated by dry lamination on the inner surface of the base layer 93. Furthermore, the second sealant layer 95 is bonded to the inner surface of the laminate of the barrier layer 94 by dry lamination.

[0080] In this manner, the laminate 90 of the trunk portion 71 is obtained. However, the manufacturing method is not limited to the above-described method as long as the desired laminate 90 can be obtained.

[0081] The laminate 90 of the body 71 thus obtained is rolled up into a cylindrical shape, and as described above, both end portions 73A, 73B are overlapped, and the outer and inner surfaces of the laminate 90 are heat-sealed at both end portions 73A, 73B to form the body bonding portion 72, thereby producing the cylindrical body 71. In this case, the first sealant layer 92 provided on the outer surface side of the laminate 90 and the second sealant layer 95 provided on the inner surface side are melted and joined, thereby obtaining the cylindrical body 71.

[0082] Although the body affixing portion 72 is formed by overlapping in the above example, the end faces of both end portions 73A, 73B may be butted together and joined. Furthermore, the joining line formed by butting together as described above may be protected by applying a film to the inner or outer surface of the cylindrical body portion 71. The inner end portion 73B may also be processed to protect the end face. For example, this may be done by applying tape or by folding the end portion 73B toward the outside of the container (hemming).

[0083] Next, the opening (upper side) 74A of the cylindrical body 71 shown in FIG. 7 is inserted into a mold (not shown), and a shoulder 75 and a mouth 76 are formed at the opening (upper side) 74A of the cylindrical body 71 using a method such as compression molding or injection molding, thereby obtaining the tube container 70 (see FIG. 1).

[0084] Next, a cap 1 is attached to the opening 76 of the tube container 70 manufactured as described above, and a plurality of the tube containers 70 with the cap 1 attached are stored together in a cardboard box. Thereafter, the plurality of tube containers 70 with the cap 1 attached are transported together in a cardboard box. Thereafter, at the transport destination, an appropriate amount of content, such as mustard paste, wasabi paste, toothpaste, or other fluid, is filled into the tube containers 70, and the opening (lower side) 74B is welded to form a bottom seal 79. This results in a packaged product 70A in which the content is filled and packaged in the tube container 70.

[0085] Example 1 The cap was manufactured using an injection molding machine equipped with a mold. A mixture of polypropylene and polyethylene was used as the thermoplastic resin constituting the cap 1. The polypropylene used was PM921V (density: 0.90 g / cm) manufactured by SunAllomer Co., Ltd. 3 The polyethylene used was "SHA7260 (density: 0.955 g / cm3) manufactured by Braskem, a biomass-derived high-density polyethylene. 3 The polypropylene and polyethylene mixture ratio was 3:7 by mass. In other words, the polypropylene content was 30% by mass.

[0086] The molding conditions were a filling time of 0.97 seconds, a cycle time of 30.0 seconds, a maximum filling pressure of 82.3 MPa, and a resin temperature of 210°C. The filling time is the time it takes for the molten thermoplastic resin flowing from the sprue, the inlet of the mold, to completely fill the cavity formed by the mold. The cycle time is the time from when the mold is closed to when the molded product is removed, and is the time required to produce one cap 1.

[0087] The laminate 90 constituting the trunk portion 71 was manufactured as follows. The specific configuration of each layer constituting the laminate 90 was as follows: a 130 μm-thick LLDPE film for the first sealant layer 92, a 12 μm-thick PET film for the base layer 93, a 12 μm-thick VM-PET film for the barrier layer 94, and a 100 μm-thick LLDPE film for the second sealant layer 95. An aluminum-deposited PET film was used as the VM-PET film. The LLDPE film used for the first sealant layer 92 was formed with the addition of an antistatic agent. However, depending on the application, the addition of an antistatic agent may not be necessary.

[0088] Specifically, first, the inner surface printed portion 13A was formed on the inner surface of a 12 μm thick PET film that would become the base layer 93. Next, a 130 μm thick LLDPE film that would become the first sealant layer 92 was attached by dry lamination to the outer surface of the 12 μm thick PET film that would become the base layer 93. The 130 μm thick LLDPE film that would become the first sealant layer 92 had an MFR (Melt Flow Rate) of 1.9 g / 10 min and a density of 0.92 g / cm. 3 The melting point was 118°C.

[0089] Next, a 12 μm-thick VM-PET film to be the barrier layer 94 was attached by dry lamination to the inner surface of the base layer 93. This resulted in a laminate in which the first sealant layer 92, base layer 93, and barrier layer 94 were laminated.

[0090] Next, a 100 μm thick LLDPE film that would become second sealant layer 95 was attached by dry lamination to the inner surface of barrier layer 94. The 100 μm thick LLDPE film that would become second sealant layer 95 had the same melt flow rate (MFR) of 1.9 g / 10 min and density of 0.92 g / cm as the first sealant layer 92. 3 The second sealant layer 95 used had a melting point of 118° C. However, no antistatic agent was added to the second sealant layer 95.

[0091] Next, the barrier layer 94 side of the laminate in which the first sealant layer 92, the base layer 93, and the barrier layer 94 were laminated was attached to the second sealant layer 95 by dry lamination.

[0092] As a result, a laminate 90 having a structure of LLDPE 130 μm / DL / PET 12 μm / printing layer (ink) / DL / VM-PET 12 μm / DL / LLDPE 100 μm was obtained.

[0093] The laminate 90 was then rolled into a cylindrical shape, and both ends 73A and 73B were overlapped as described above. The outer and inner surfaces of the laminate 90 were heat-sealed at both ends 73A and 73B to form a sleeve 72, thereby producing a cylindrical body 71. The inner diameter of the cylindrical body 71, which defines the tube shape, was 38 mm. Next, the opening 74A of the cylindrical body 71 was inserted into a mold, and the cylindrical body 71 was compression-molded to form a shoulder 75 and a neck 76 at the opening 74A of the cylindrical body 71. Then, 90 g of toothpaste paste (dentifrice) was filled as the contents through the other opening 74B of the cylindrical body 71. The opening 74B was then welded to form a bottom seal 79, producing a tube container 70 filled with the contents. Then, the cap 1 was attached to the tube container 70 by screwing the inner surface of the separately prepared cap 1 with the screw structure on the outer surface of the mouth portion 76 of the tube container 70, thereby obtaining a capped tube container filled with the contents.

[0094] <Example 2> The mixing ratio of polypropylene to polyethylene was 7:3 by mass. That is, except that the polypropylene content was 70 mass%, a cap was produced in the same manner as in Example 1. Furthermore, a tube container 70 was produced in the same manner as in Example 1, and a cap 1 was attached to obtain a tube container with a cap filled with the contents.

[0095] <Comparative Example 1> Polypropylene was used as the thermoplastic resin constituting the cap 1. That is, the content of polypropylene was 100% by mass. As the polypropylene, PM921V (density: 0.9 g / cm) manufactured by SunAllomer Co., Ltd. was used. 3 , MFR: 25 g / 10 min) was used. Except for this, a cap was produced in the same manner as in Example 1. Furthermore, a tube container 70 was produced in the same manner as in Example 1, and a cap 1 was attached to obtain a tube container with a cap filled with the contents.

[0096] <Comparative Example 2> Polyethylene was used as the thermoplastic resin constituting the cap 1. That is, the content of polyethylene was set to 100% by mass. As the polyethylene, "SHA7260 (density: 0.955 g / cm) manufactured by Braskem Corporation, which is a high-density polyethylene derived from biomass, was used. 3 , MFR: 20 g / 10 min, biomass content: 94%) was used. Except for this, a cap was produced in the same manner as in Example 1. Furthermore, a tube container 70 was produced in the same manner as in Example 1, and a cap 1 was attached to obtain a tube container with a cap filled with the contents.

[0097] <Evaluation> The capped tube containers of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated using two indices: "hinge elasticity" and "content leakage."

[0098] The hinge elasticity was measured using Imada's popular mechanical force gauge FB100N as a push-pull gauge to measure both closing elasticity and opening elasticity. For closing elasticity, the outer surface 34 of the lid portion 30 of the cap 1 was pressed with the pressing force measurement shaft of the push-pull gauge from an opened state, and the peak value of the pressing strength until the lid portion 30 was just about to fit was measured as closing elasticity.

[0099] Regarding the opening elasticity, when the lid portion 30 of the cap 1 was disengaged, i.e., when the engagement rib 39 and the locking rib 18 were disengaged, the protrusion 36 of the lid portion 30 was measured using the tensile force measurement axis of a push-pull gauge, and the peak value of the tensile strength until the lid portion 30 was fully opened was measured as the opening elasticity.

[0100] Regarding leakage of contents, the tube container 70 was fitted with the cap 1, and with the cap 1 closed, the tube container 70 was filled with 100 g of reagent (a water:ethanol=5:5 solution colored with methylene blue), and then stored in an inverted position at room temperature (20°C) for 24 hours. After storage, the filled reagent was discharged and the tube container 70 was dried in a 50°C dry environment, and then the state of leakage of the reagent from the tube container 70 was visually confirmed. The leakage state was judged as follows: ◯: liquid stopped up to the inner ring 27; Δ: liquid stopped up to the contact ring 28; and ×: liquid leaked up to the mounting portion 23 equipped with the screw structure 24. The evaluation results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1.

[0101] [Table 1]

[0102] From the evaluation results shown in Table 1, it was confirmed that, with regard to hinge elasticity, both the closing elasticity and the opening elasticity were significantly lower in Comparative Example 2 (100% HDPE) compared to Comparative Example 1 (100% polypropylene). Furthermore, it was confirmed that, compared to Comparative Example 2, the hinge elasticity improved in Examples 1 and 2 as the polyethylene content decreased. In Examples 1 and 2, the closing elasticity was 0.40 N or more and the opening elasticity was 0.32 N or more, both of which were moderate values.

[0103] Furthermore, from the evaluation results shown in Table 1, with regard to content leakage, Comparative Example 1 (100% polypropylene) was rated as fair, with the content leaking out reaching the contact ring, whereas Comparative Example 2 and Examples 1 and 2 were rated as good, with the content leaking out stopping at the contact ring. These results confirmed that Examples 1 and 2 had high content leakage resistance.

[0104] Judging comprehensively based on the evaluation results in Table 1, there is a trade-off between hinge elasticity and content leakage. However, in order to maintain a balance between the two and use hinge elasticity to improve the operability of opening and closing the cap while reducing content leakage, it is preferable that cap 1 is made from a mixture of polypropylene and polyethylene, with the polypropylene content being 30% by mass or more and 70% by mass or less (30% by mass to 70% by mass).

[0105] While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications are possible. For example, in the above embodiments, a screw-type cap having a threaded structure on the outer periphery of the opening and on the inside of the cap body is used as the cap for the tube container, but other types that are attached to the tube container by other means, such as a type that is connected by a so-called one-touch fitting and that allows the cap to be attached to and detached from the container by linear movement only in the up and down direction, may also be used as long as it has a hinge.

[0106] In addition, in the above embodiment, the laminate is configured to have a barrier layer between the base layer and the second sealant layer, but it is not necessarily required to provide a barrier layer, and it can be provided as appropriate depending on the characteristics of the contents. [Explanation of symbols]

[0107] 1···Cap 10 Cap body 11 Nozzle 12... Circuit board 13...inner surface 14. Torso 15. Recess 16...Outer surface 17. Stepped section 18 Locking rib 19...Latching protrusion 20...Lower cylinder part 21... Upper cylinder part 22. Regulatory plate 23 Mounting part 24···Screw structure 25 Reinforcing rib 26... Thick wall part 27···Inner ring 28. Contact ring 30...Lid part 31...occlusion plate 32...inner surface 33 Side 34...Outer surface 35. Recess 36...Protrusion 37 First closure rib 38... Second closure rib 39 Engagement rib 50···hinge 70 tube containers 71 Torso 72 Body attachment part 73A: The outer edge of the bonded joint when bonding the body 73B: The edge of the joint that will be the inside when the body is joined. 74A...Opening (upper side) 74B...Opening (lower side) 75...Shoulder 76...Mouth 77···Screw structure 78...Head molding 79 Bottom seal 90.....(of the body 71 of the tube container 70) laminate 92 First sealant layer 93...Base material layer 94 Barrier layer 95...Second sealant layer

Claims

1. A hinged cap that is attached to a tube container having a mouth portion that is a discharge outlet and closes the mouth portion, The cap includes a cap body and a lid portion, The cap body is detachably screwed onto the opening, the cap body has a thick portion that protrudes inward at a joint between an inner surface of the base plate and an inner circumferential surface of the body portion below a portion where the hinge is connected, The lid portion includes a flat closing plate having an inner surface provided with an annular first closing rib protruding upward, the first blocking rib corresponds to a nozzle provided in the cap body, and the inner diameter of the first blocking rib is the same as the outer diameter of the upper cylindrical portion of the nozzle; The inner surface of the closure plate is provided with a second annular closure rib that protrudes upward, the second blocking rib corresponds to a nozzle provided in the cap body, and the outer diameter of the second blocking rib is the same as the inner diameter of a circular through-hole that forms the inner edge of a regulating plate of the nozzle; the second closure rib is formed inside the first closure rib and at a concentric position; an upward protruding height of the second closure rib is greater than an upward protruding height of the first closure rib; The hinged cap is characterized in that the cap is made of a mixture of polypropylene and polyethylene (excluding linear low-density polyethylene), and the polypropylene content is 30% by mass or more and 70% by mass or less.

2. 2. The hinged cap of claim 1, wherein the polyethylene is high density polyethylene.

3. 3. The hinged cap according to claim 1, wherein the polyethylene contained in the cap comprises biomass-derived polyethylene obtained by polymerizing a monomer containing biomass-derived ethylene.

4. A hinged cap according to any one of claims 1 to 3; a tube container with a cap, characterized by comprising the above-mentioned mouth portion, a laminate having at least a first sealant layer, a base material layer, and a second sealant layer used as a body portion, and the body portion and a shoulder portion joined together.

5. 5. The tube container with a cap according to claim 4, wherein the polyethylene constituting the opening is high-density polyethylene.

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