JP2021160727A - Hinged cap and capped tube container - Google Patents

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

The present invention relates to a hinged cap suitable for use in a tube container or the like, and a tube container with a cap using such a cap.

Conventionally, the head (pouring port) and cap of the tube container body are generally molded by a compression molding method or an injection molding method using a thermoplastic resin such as polyolefin. For example, a resin such as polyethylene is used for the head of the tube container body, and the cap is molded using a resin such as polypropylene (PP).

The contents to be filled in the tube container, such as paste-like semi-fluid substances and those containing oil such as seasonings, have a relatively low viscosity, and the cap of the tube container is closed. However, the contents sometimes exuded from the gap between the spout and the cap, and the contents leaked out. Therefore, a tube container is also disclosed in which the main component of the cap is polyethylene (PE) to increase the torque when opening the cap and suppress the leakage of the contents (see Patent Document 1).

JP-A-2018-167860

On the other hand, as the cap of the tube container, a cap with a hinge in which the cap body and the lid are connected by a hinge is also used. If the cap body with a hinge is attached to the tube container, the contents can be taken out by simply swinging the hinge and opening the lid at the time of use, which is convenient. However, when the main component of the cap is polyethylene as in the conventional technology, the hinge is also made of polyethylene, so that the followability to the opening / closing operation of the lid is not sufficient, and the user is given a comfortable feeling of use. There is a problem that it is difficult.

Therefore, it is an object of the present invention to provide a hinged cap capable of suppressing leakage of contents and enhancing usability at the time of opening and closing, and a tube container with a cap using such a cap. And.

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

Further, the hinged cap of the present invention is
The polyethylene is a high-density polyethylene.

Further, the hinged cap of the present invention is
The polyethylene contained in the cap is characterized by containing biomass-derived polyethylene obtained by polymerizing a monomer containing biomass-derived ethylene.

In addition, the present invention
With the hinged cap
A tube container having the mouth portion and having at least a first sealant layer, a base material layer, and a second sealant layer as a body portion and the body portion and the shoulder portion joined to each other.
Provided is a tube container with a cap, which comprises.

Further, the tube container with a cap of the present invention is
The polyethylene constituting the mouth portion is a high-density polyethylene.

According to the present invention, it is possible to provide a hinged cap capable of suppressing leakage of contents and enhancing the usability at the time of opening and closing, and a tube container with a cap using such a cap. ..

It is a front view of the tube container with the hinged cap attached. It is a front view of the packaged product of the tube container containing contents. It is a top view of the cap 1 which concerns on one Embodiment of this invention. It is a side view of the cap 1 which concerns on one Embodiment of this invention. It is a bottom view of the cap 1 which concerns on one Embodiment of this invention. It is sectional drawing in the AA line (center line) of FIG. It is a figure which shows the cylindrical body part of the tube container which concerns on one Embodiment of this invention. It is sectional drawing of the laminated body of the body part of the tube container which concerns on one Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
However, the present invention is not limited to these specifically exemplified forms and various concretely described structures. In each figure, the size and ratio of the members may be changed or exaggerated for the sake of clarity. In addition, for the sake of readability, unnecessary parts for explanation and repeated codes may be omitted.

In the present specification, the "outer surface" and "inner surface" mean the "outer surface" and "inner surface" when the tube container 70 is manufactured by using the laminated body 90. Regarding the "upper side" and "lower side", the "upper side" means the mouth portion 76 side and the cap 1 side, based on the state in which the tube container 70 has the mouth portion 76 and the cap 1 facing upward, and is "lower". The “side” means the opposite side of the mouth portion 76 (74B side in FIG. 1, 79 side in FIG. 2).

FIG. 1 is a partial cross-sectional view of a tube container with a hinged cap according to the present embodiment attached. FIG. 2 is a partial cross-sectional view of a packaged product of a tube container containing contents. As shown in FIGS. 1 and 2, in the tube container 70 according to the present embodiment, a body portion 71 composed of a laminated body 90 and a synthetic resin are formed on the body portion 71 by a method such as compression molding or injection molding. It includes a head molded body 78 produced by providing the head molded body 78. The head molded body 78 further includes a shoulder portion 75 and a mouth portion 76. Further, a cap 1 with a hinge for preventing the contents from leaking from the discharge port of the mouth portion 76 is attached to the mouth portion 76 of the tube container 70. The head molded body 78 becomes a head having a mouth portion 76 which is a discharge port, and is connected to the body portion 71 to form a tube container 70.

The tube container 70 is composed of a cylindrical mouth portion 76 including a discharge port which is an opening for discharge, and a weight base tubular shoulder portion 75 which is connected to the mouth portion 76 and whose outer circumference expands toward the lower side. It has a head molded body 78 to be formed. In FIGS. 1 and 2, the cap 1 attached to the head molded body 78 is shown in a cross-sectional view. Further, in FIGS. 1 and 2, the cap 1 is in a closed state. Although details will be described later, the cap 1 includes a cap body 10 and a lid portion 30, and the state in which the lid portion 30 is fitted to the cap body 10 is closed and the lid portion 30 is removed from the cap body 10. The state is called the opened state. The shoulder portion 75 is formed in the shape of a truncated cone, for example, which extends outward in the radial direction of the tube container 70 as the distance from the mouth portion 76 increases. For example, the shoulder portion 75 has an inclination of 30 degrees with respect to the horizontal. The shoulder portion 75 is continuously provided to the body portion 71 on the lower side.

The substantially cylindrical mouth portion 76 has a spiral screw structure 77 that functions as a thread on the outer surface side. 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. Since the head molded body 78 has the above-mentioned structure, it can be attached and detached by being screwed with a cap 1 having a spiral screw structure 24 that functions as a screw groove inside.

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, and FIG. 5 is a bottom view of the cap 1 according to the present embodiment. FIG. 6 is a cross-sectional view taken along the line AA of FIG. In addition, in accordance with the vertical direction of the entire tube container shown in FIGS. 1 and 2, in the following, for convenience of explanation, the nozzle 11 side as the injection port of the cap body 10 in FIG. 4 is on the upper side, and the body portion 14 side is on the upper side. I will explain it as the lower side. Further, the line AA in FIG. 3 is a center line connecting the centers of the cap body 10, the hinge 50, and the lid portion 30 of the cap 1, and FIG. 6 is a vertical cross section of the center line (line AA) of the cap 1. It is a figure.

As shown in FIGS. 3 to 6, the cap 1 according to the present embodiment is a cap with a hinge, includes a cap body 10, a lid portion 30, and a hinge 50, and has a symmetrical shape with respect to the AA line. Is. The cap body 10 has a nozzle 11 as a spout, and has a substantially circular substrate 12 in a plan view, a substantially cylindrical body portion 14 and the like suspended from an inner surface 13 along the outer edge of the substrate 12. It has an eclipsed cylinder shape. The lid portion 30 has an ecstatic cylindrical shape having a substantially circular closing plate 31 in a plan view and a substantially cylindrical side portion 33 or the like hanging from the inner surface 32 along the outer edge of the closing plate 31. The lid portion 30 is connected to the cap body 10 via a hinge 50 in a state where the open end of the side portion 33 is located upward.

The cap 1 has a configuration in which the cap body 10 is attached to the tube container 70, and the contents contained in the tube container 70 are poured out from the tip of the nozzle 11 as a spout. Further, the cap 1 has a configuration in which the lid portion 30 can swing with respect to the cap main body 10 by the hinge 50, the lid portion 30 is covered so as to cover the cap main body 10 from above, and the lid portion 30 is placed on the cap main body 10. By fitting, the nozzle 11 as a spout is closed by the lid portion 30, and the spout can be closed. That is, the hinge 50 oscillately connects the lid portion 30 to the cap body 10 between the closed state in which the nozzle 11 is covered by the lid portion 30 and the opened state in which the nozzle 11 is opened. ing.

Here, the configuration of the eclipsed cylindrical cap body 10 having the substrate 12 and the body portion 14 will be described in detail. The substrate 12 is a substantially circular plate-shaped member whose center is located on the center A line in a plan view. A substantially cylindrical body portion 14 is vertically provided on the substrate 12 from the inner surface 13 downward along the outer edge. Here, a recess 15 that is recessed inward is formed on the side of the climaxed cylindrical cap body 10 opposite to the hinge 50. The recess 15 is formed from the end of the substrate 12 to the body portion 14, and faces downward from the outer surface 16 side of the substrate 12 (cylindrical axis direction of the body portion 14: the inner side of FIG. 3, the lower side of FIG. 4). Will be extended. The recess 15 forms a flat surface extending vertically and in the left-right direction on the outer peripheral surface of the body portion 14. The substrate 12 has a substantially circular shape symmetrical with respect to the center line (AA line) in which the opposite side of the hinge 50 is cut out in a plan view, and the cap body 10 has a symmetric eclipse with respect to the center line. It is cylindrical. The outer diameter of the body portion 14 is substantially the same as the outer diameter of the side portion 33 of the lid portion 30.

The substrate 12 has a stepped portion 17 that is recessed from the outer surface 16 toward the inner surface 13 over the entire circumference of the outer edge. The bottom surface of the step portion 17 is a horizontal plane. The radial width and the vertical depth of the step portion 17 are substantially constant in the circumferential direction. Further, the substrate 12 includes a locking rib 18 projecting upward and radially outward from the outer surface 16 over the entire circumference of the inner peripheral edge of the step portion 17. An annular locking projection 19 projecting outward is formed on the upper portion of the locking rib 18 on the outer peripheral side. The locking rib 18 locks the engaging rib 39 of the lid portion 30, which will be described later. When the engaging rib 39 is locked to the locking rib 18, the lid portion 30 is locked to the cap body 10. Further, 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 the lid portion 30 is attached to the cap body 10. In the fitted closed state, it comes into contact with the inner peripheral surface of the side portion 33. One end of a hinge 50 is continuously provided at the outer edge end of the substrate 12 and the upper end of the body 14. A lid portion 30 is continuously provided at the other end of the hinge 50, and the lid portion 30 is swingably connected to the cap body 10 via the hinge 50.

The nozzle 11 has a cylindrical shape, and has a lower cylinder portion 20 having a truncated cone shape with a diameter reduced upward from the outer surface 16 of the substrate 12, and a cylindrical shape connected to the upper end of the lower cylinder portion 20. It is composed of an upper cylinder portion 21. The nozzle 11 is arranged at a position eccentric from the center of the substrate 12 to the recess 15 side by a predetermined distance in a plan view. The inside of the nozzle 11 penetrates the substrate 12 and communicates with the inside of the body portion 14. Then, the contents can be poured out from the tip of the nozzle 11 as a pouring outlet. A regulation plate 22 with a through hole near the center is formed on the inner peripheral surface of the upper cylinder portion 21 of the nozzle 11. The regulation plate 22 is a plate-shaped member having a circular inner edge surrounding the through hole and an outer edge serving as an inner peripheral surface of the upper cylinder portion 21. The regulation plate 22 is for adjusting the pouring condition such as the pouring amount when pouring the liquid or viscous contents from the nozzle 11, and narrows the inside of the nozzle 11 through which the contents pass. It is configured in. By simply changing the size of the regulation plate 22 according to the viscosity of the contents, the pouring condition can be adjusted to suit the contents, and the versatility is high.

Further, the cap body 10 has a cylindrical mounting portion 23 that is vertically hung from the inner surface 13 of the substrate 12 downward (cylindrical axis direction of the body portion 14: the front side in FIG. 5 and the lower side in FIG. 6). Have. As shown in FIG. 5, the mounting portion 23 is formed at a position concentric with the cylinder shaft of the body portion 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.

Here, the mounting portion 23 is screwed into the cylindrical mouth portion 76 of the tube container 70, and the mounting portion 23 is screwed into the mouth portion 76 of the tube container 70, so that the cap body 10 is screwed. It is attached to the tube container 70. Then, the contents contained in the tube container 70 pass through the inside of the nozzle 11 as a spout from the mouth portion 76, and are poured out from the tip of the nozzle 11.

Further, the cap body 10 has six reinforcing ribs 25 that project 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 substantially equal intervals in the circumferential direction. The rigidity of the cylindrical mounting portion 23 is improved by the six reinforcing ribs 25. The reinforcing rib 25 is not limited to the above configuration. For example, the reinforcing rib 25 may be formed in a plate shape extending from the outer peripheral surface of the mounting portion 23 to the inner circumference of the body portion 14.

Further, as shown in FIGS. 5 and 6, the cap body 10 hangs downward from the inner surface 13 of the substrate 12 (cylindrical axis direction of the body portion 14: the front side of FIG. 5, the lower side of FIG. 6). It has an inner ring 27 and a contact ring 28 to be provided. As shown in FIG. 5, the inner ring 27 and the contact ring 28 are formed concentrically with the tubular shaft of the body portion 14 and the attachment portion 23, and are formed at positions inside the attachment portion 23. The inner ring 27 is located inside the contact ring 28.

The inner ring 27 is a portion 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, at the time of mounting, the inner ring 27 and the mounting portion 23 are in a state of sandwiching the peripheral wall of the mouth portion 76. The vertical length of the inner ring 27, that is, the length extending downward from the inner surface 13 (the tubular axis direction of the body portion 14: the front side in FIG. 5, the lower side in FIG. 6) is 1 of the mounting portion 23. It is about / 3.

The contact ring 28 is a portion that holds the upper portion of the mouth portion 76 of the tube container 70 when the cap 1 is attached to the tube container 70. By suppressing the upper part of the mouth portion 76 by the contact ring 28, the gap between the contact ring 28 and the upper part of the mouth portion 76 is eliminated, and leakage of the contents can be suppressed. In a plan view as shown in FIG. 5, the contact ring 28 is located on the outer peripheral side of the inner ring 27 and on the inner peripheral side of the mounting portion 23. Further, the diameter of the contact ring 28 is substantially the same as the diameter of the mouth portion 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 about 1 mm.

Further, the cap body 10 has a thick portion 26 protruding inward at the joint portion between the inner surface 13 of the substrate 12 and the inner peripheral surface of the body portion 14 below the portion to which the hinge 50 is connected. .. The thick portion 26 improves the rigidity of the portion to which the hinge 50 of the cap body 10 is connected.

Next, the configuration of the climax cylindrical lid portion 30 having the closing plate 31 and the side portion 33 will be described in detail. The block plate 31 is a substantially circular plate-shaped member whose center is located on the center line in a plan view. The block plate 31 is curved in a convex shape so that the inner surface 32 side projects from the outer surface 34 toward the inner surface 32. On the other hand, the annular portion near the outer edge of the outer surface 34 of the block plate 31 is not curved toward the inner surface 32 and is formed on a flat surface. Further, a substantially cylindrical side portion 33 is vertically installed on the closing plate 31 from the inner surface 32 upward along the outer edge. Here, a recess 35 recessed inward is formed on the opposite side of the hinge 50 in the side portion 33 of the climax cylindrical lid portion 30. 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. Further, on the closing plate 31 side on which the recess 35 is formed, a protruding portion 36 is formed in which the closing plate 31 projects 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 substantially the same as the outer diameter of the body portion 14 of the cap body 10. Therefore, the lid portion 30 has an eclipsed cylindrical shape symmetrical with respect to the center line, and has a shape corresponding to the cap main body 10.

The lid portion 30 has an annular first closing rib 37 that projects upward from the inner surface 32 of the closing plate 31. The first blocking rib 37 corresponds to the nozzle 11 of the cap body 10 and is formed at a position eccentric from the center of the closing plate 31 toward the recess 35 by a predetermined distance. The inner diameter of the first closing rib 37 is substantially the same as the outer diameter of the upper cylinder portion 21 of the nozzle 11. Further, the lid portion 30 has an annular second blocking rib 38 that projects upward from the inner surface 32 of the closing plate 31, similarly to the first closing rib 37. The second blocking rib 38 is formed at a position concentric with the first blocking rib 37 and corresponds to the nozzle 11 of the cap body 10. The outer diameter of the second closing rib 38 is substantially the same as the inner diameter of the circular through hole that is the inner edge of the regulation plate 22 of the nozzle 11. The upward protruding height of the second blocking rib 38 is higher than the upward protruding height of the first blocking rib 37. Although the details will be described later, when the lid portion 30 is fitted to the cap body 10, the second closing rib 38 is inserted into the upper cylinder portion 21 of the nozzle 11, and the upper cylinder portion 21 of the nozzle 11 is inserted. Is inserted inside the first closing rib 37. That is, the upper cylinder portion 21 of the nozzle 11 is fitted into the annular gap formed between the first closing rib 37 and the second closing rib 38, and the tip of the nozzle 11 is closed.

Further, on the opposite side of the side portion 33 in which the recess 35 is formed, an engaging rib 39 projecting inward from the inner peripheral surface is formed. The engaging rib 39 extends along the side portion 33 in a direction orthogonal to the center line. Here, the engaging rib 39 corresponds to the locking rib 18 of the cap body 10. Then, when the lid portion 30 is fitted to the cap body 10, the engaging rib 39 and the locking rib 18 are engaged, and the lid portion 30 is locked to the cap body 10.

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

In this embodiment, a mixture of polypropylene and polyethylene is used as the thermoplastic resin used as the material of the cap 1. The polypropylene content is preferably 30% by mass or more and 70% by mass or less (30% by mass to 70% by mass) of the thermoplastic resin used as the material of the cap 1. If the polypropylene content is less than 30% by mass, the elasticity of the hinge is lowered, and it becomes difficult to feel a clear attachment / detachment feeling when opening / closing the cap. On the other hand, when the polypropylene content ratio exceeds 70% by mass, the airtightness between the nozzle and the lid of the cap is lowered, and the contents are likely to leak out.

Further, as the polyethylene mixed with the thermoplastic resin used as the material of the cap 1, at least one selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene, or linear low-density polyethylene is used. be able to. Further, two or more kinds may be selected and mixed from the group consisting of high density polyethylene, medium density polyethylene, low density polyethylene, or linear low density polyethylene. In particular, it is preferable to use high-density polyethylene as the polyethylene. By using high-density polyethylene, the drop strength in a low temperature environment is improved.

The high-density polyethylene has a density of 0.941 g / cm ³ or more, preferably 0.941 g / cm ³ or more and less than 0.965 g / cm ³ , and is a low-pressure polymerization method (gas phase using a Ziegler-Natta catalyst). It means one obtained by polymerizing ethylene by a polymerization method or a liquid phase polymerization method using a metallocene catalyst). Further, the medium density polyethylene means one obtained by polymerizing ethylene having a density of 0.930 g / cm ³ or more and less than 0.941 g / cm ^3. Further, the low-density polyethylene, density of less than 0.93 g / cm ^3, preferably 0.91 g / cm ³ or more and less than 0.93 g / cm ^3, by polymerizing ethylene with organic high-pressure polymerization processes Means what you get. Moreover, the linear low density polyethylene, density of less than 0.93 g / cm ^3, preferably a density of 0.91 g / cm ³ or more and less than 0.93 g / cm ^3, ethylene by low pressure polymerization processes And means one obtained by polymerizing a small amount of α-olefin. Conventionally, the head molded body 78 of the tube container 70 uses polyethylene, but the cap 1 uses polypropylene. One of the reasons was to ensure the elasticity of the hinge when opening the cap.

The body portion 71 is formed by forming a film-like laminate into a cylindrical shape. Then, one end of the body portion 71 extending in a tubular shape is joined to the shoulder portion 75. On the other hand, the other end of the body portion 71 is sealed by the bottom seal portion 79 in which the inner surfaces of the tubular body portion 71 are overlapped and joined (see FIG. 2). The bottom seal portion 79 may be joined after the body portion 71 is filled with the contents. The tube container 70, particularly the body 71, is configured to have flexibility (flexibility, squeeze property) capable of easily extruding a desired amount even if the contents have some viscosity. good. The dimensions of the body portion 71 may be appropriately designed depending on the type of contents and the like, and for example, the diameter is 50 mm.

The tube container 70 having the above configuration is obtained through the following manufacturing process.
First, as shown in FIG. 7, the laminated body 90 is used to superimpose a pair of bonded ends (hereinafter, may be referred to as both ends) 73A and 73B of the laminated body 90, and the overlapped portion thereof. A tubular body portion 71 is manufactured by heat-sealing and bonding the outer surface and the inner surface of the body portion 72 to form a body-pasting portion 72.

As a heat sealing method, a conventionally known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, and a flame seal can be used.

Next, the tubular body 71 shown in FIG. 7 is mounted in a mold (not shown), and a method such as compression molding or injection molding is performed in one opening (upper side) 74A of the body 71. The head molded body 78 (shoulder portion 75, mouth portion 76) shown in FIG. 1 is formed. In this way, the head molded body 78 (shoulder portion 75, mouth portion 76) is integrally molded in one opening (upper side) 74A of the body portion 71 to produce the tube container 70. Then, the cap 1 is attached to the mouth portion 76 side of the tube container 70.

Next, from the other opening (lower side) 74B of the tubular body 71 of the tube container 70 shown in FIG. 1, for example, mustard, wasabi, toothpaste, and other contents are filled in an appropriate amount. Will be done. After that, the opening (lower side) 74B is welded to form the bottom seal portion 79 shown in FIG. As a result, a packaged product 70A (see FIG. 2) including a tube container 70 filled and packaged with the contents is obtained.

The details of the head molded body 78 will be further described. The head molded body 78 can be molded so that the mouth portion 76 and the shoulder portion 75 have appropriate hardness, and the body portion 71 has high adhesiveness to the material and does not affect the quality of the contents. A material that does not interfere with hygiene even if it comes into contact with the contents is used. As such a material, a thermoplastic resin is used for the head molded body 78, and more specifically, high density polyethylene (HDPE) is used.

Further, the head molded body 78 includes polyolefin resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, polypropylene (homopolypropylene, block-shaped polypropylene, random polypropylene), olefins, and vinyl-based monomers. Polyolefin-based resins such as acrylic monomers and copolymers with copolymerizable monomers such as unsaturated carboxylic acids and blend compositions thereof, and resins in which the above-mentioned resins are blended with high-density polyethylene are used. Is also good. Further, from the viewpoint 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 molded body 78. Further, a truncated cone-shaped cylinder as a barrier material may be laminated on the head molded body 78, particularly on the shoulder portion 75, in order to prevent the permeation of a gas such as oxygen. The shoulder portion 75 may contain a plant-derived resin.

The high-density polyethylene used for forming the cap 1 and the head molded body 78 may be derived from a fossil raw material, but in order to reduce the environmental load, a high-density polyethylene derived from biomass known as a carbon-neutral material is used. You may. Since the head and cap occupy a large proportion of the tube container, the amount of fossil raw material used in the tube container as a whole can be reduced by molding the cap 1 and the head molded body 78 using high-density polyethylene derived from biomass. It can reduce the environmental load. Further, the head molded body 78 of the tube container 70 is comparable to the head manufactured from the raw material obtained from the conventional fossil raw material in terms of physical properties such as mechanical properties, and thus replaces the conventional head. can do.

From the viewpoint of reducing the environmental load, it can be said that it is preferable to use only polyethylene derived from biomass, but in consideration of manufacturing cost and the like, a blend of polyethylene derived from fossil raw materials and polyethylene derived from biomass may be used. .. Here, the biomass-derived polyethylene is a monomer polymer containing ethylene derived from biomass. Since ethylene derived from biomass is used as the monomer as a raw material, the polyethylene polymerized is derived from biomass. The content of biomass-derived ethylene in the raw material monomer does not have to be 100% by mass, for example, preferably 10% by mass or more, more preferably 30% by mass or more. The raw material monomer may contain ethylene derived from a fossil raw material, or may contain an α-olefin monomer such as butene, hexene, and octene. Even in such a case, the obtained polymer is called biomass polyethylene. When polyethylene derived from biomass is used, it may contain two or more types of polyolefins having different biomass degrees. Further, when the polyethylene derived from the fossil raw material and the polyethylene derived from the biomass are blended, the mixing method is not particularly limited, and a dry blend or a melt blend may be used. When both are mixed, the mixing ratio of the fossil raw material-derived polyethylene and the biomass-derived polyethylene is preferably 1: 9 to 9: 1, more preferably 2: 8 to 8: 2 in terms of mass ratio.

For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use fermented ethanol derived from biomass obtained from plant raw materials. That is, it is preferable to use a plant-derived resin. The plant material is not particularly limited, and conventionally known plants can be used. For example, corn, sugar cane, beet, and manioc can be mentioned.

In the present invention, the fermented ethanol derived from biomass refers to ethanol purified by contacting a culture solution containing a carbon source obtained from a plant raw material with a microorganism producing ethanol or a product derived from a crushed product thereof. Conventionally known methods such as distillation, membrane separation, and extraction can be applied to the purification of ethanol from the culture broth. For example, a method of adding benzene, cyclohexane or the like and azeotropically boiling the mixture, or removing water by membrane separation or the like can be mentioned.

As the high-density polyethylene derived from biomass, it is preferable to use one having a high degree of biomass. The biomass degree is a value of the C14 content obtained by a radiocarbon (C14) measurement method based on ASTM-D6866. Since carbon dioxide in the atmosphere contains C14 at a fixed ratio (105.5 pMC), the C14 content in plants that grow by taking in carbon dioxide in the atmosphere, such as corn, is also about 105.5 pMC. It is known. 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 contained in all carbon atoms in polyester.

The thickness of the head molded body 78 in which such a resin is used is preferably 0.5 mm or more and 2.0 mm or less. In the present embodiment, the head molded body 78 is manufactured by compression molding (compression molding). Therefore, in the head molded body 78, which is a compression molded product, it is possible to prevent dents, so-called sink marks, caused by shrinkage during molding from occurring even on a thick portion such as the top surface. Further, waste of materials such as a gate portion can be reduced. The head molded body 78 may be manufactured by injection molding (injection molding).

Next, the laminated body 90 forming the tubular body portion 71 will be described with reference to FIG. As shown in FIG. 8, the laminate 90 forming the body portion 71 of the tube container 70 includes a first sealant layer 92, a base material layer 93, and a barrier layer 94 arranged in order from the outer surface to the inner surface. It is a laminated body having a second sealant layer 95. Although the thicknesses of the first sealant layer 92, the base material layer 93, the barrier layer 94, and the second sealant layer 95 are actually different from each other, they are shown as the same thickness in FIG. 8 for convenience. Further, since the adhesive layer formed at the time of bonding by dry laminating is thinner than other layers, the illustration is omitted. The barrier layer 94 is not an essential layer, and at least the first sealant layer 92, the base material layer 93, and the second sealant layer 95 sandwich another layer or are continuous without sandwiching another layer, in that order. Any laminated body may be used.

When forming the tubular body portion 71, the first sealant layer 92 and the second sealant layer 95 are directly bonded to each other at both ends of the laminated body 90 in order to form the body bonding portion 72. An inner surface printing portion 13A containing a desired pattern is formed on the inner surface of the base material layer 93 using printing ink. Further, a printing ink may be used to form an outer surface printing portion including a desired pattern on the outer surfaces of the first sealant layer 92 and the base material layer 93.

Further, the first sealant layer 92 and the base material layer 93 are joined by a dry laminate using an adhesive. Further, the base material layer 93 and the barrier layer 94 are joined by dry lamination. Further, the barrier layer 94 and the second sealant layer 95 are joined by a dry laminate. The layers of the first sealant layer 92, the base material layer 93, the barrier layer 94, and the second sealant layer 95 may be joined by extrusion lamination instead of dry lamination.

When two layers are bonded by dry laminating, an adhesive layer formed by applying an adhesive to the surface of the layer to be laminated and drying it can be obtained. Examples of the adhesive include one-component or two-component cured or uncured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, and others. Such solvent type, water-based type, or emulsion type adhesives can be used. As the two-component curable adhesive, a cured product of a polyol and an isocyanate compound can be used. As a coating method of the above-mentioned adhesive for laminating, for example, a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a fonten method, a transfer roll coating method, or other methods are used to form a laminate. It can be applied to the coated surface of the layer.

The thermoplastic resin used for the extruded laminate includes a polyethylene resin, a polypropylene resin, a cyclic polyolefin resin, or a copolymer resin containing these resins as a main component, a modified resin, or a mixture (including alloy). Can be used. Examples of the polyolefin resin include the above-mentioned polyethylene, polypropylene (PP), ethylene-α / olefin copolymer polymerized using a metallocene catalyst, random or block copolymer of ethylene / polypropylene, and ethylene-vinyl acetate. Polymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene / ethyl acrylate copolymer (EEA), ethylene-methacrylate copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA) ), Ethylene-maleic acid copolymer, ionomer resin, and in order to improve the adhesion between layers, the above-mentioned polyolefin-based resin is used as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid. An acid-modified polyolefin-based resin modified with an unsaturated carboxylic acid such as the above can be used.

Further, as the polyolefin resin, an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, a resin obtained by graft-polymerizing or copolymerizing an ester monomer, or the like can be used. These materials can be used alone or in combination of two or more. As the cyclic polyolefin resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbonene can be used. These resins can be used alone or in combination of two or more. As the polyethylene-based resin described above, a resin using the above-mentioned ethylene derived from biomass as a monomer unit can be used to further improve the degree of biomass.

When the adhesive resin layer is laminated by the extrusion laminating method, an anchor coat (AC) layer formed by applying an anchor coating agent and drying may be provided on the surface of the layer on the side to be laminated. Examples of the anchor coating agent include any resin having a heat resistant temperature of 135 ° C. or higher, for example, an anchor coating agent made of a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, a polyethyleneimine, or the like. An anchor coating agent which is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Further, a silane coupling agent may be used in combination with this as an additive, or nitric acid cotton may be used in combination to increase heat resistance.

The dried anchor coat layer has a thickness of 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The dried adhesive layer preferably has a thickness of 1 μm or more and 10 μm or less, preferably 2 μm or more and 5 μm or less. The adhesive resin layer preferably has a thickness of 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

Next, the material of each part constituting the laminated body 90 of the tubular body portion 71 will be described.
The first sealant layer 92 and the second sealant layer 95 may contain, for example, polyethylene (PE). Specifically, the first sealant layer 92 and the second sealant layer 95 may be prepared from the following materials.

The first sealant layer 92 and the second sealant layer 95 may be any as long as they can be melted by heat and fused to each other. For example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (high density polyethylene) ( HDPE), linear (linear) low density polyethylene (LLDPE), polypropylene (PP), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, Polyethylene-based resins such as ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene can be used as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, etc. A resin made of one or more of acid-modified polyolefin-based resin modified with unsaturated carboxylic acid, polyvinyl acetate-based resin, polyester-based resin, polystyrene-based resin, and other resins can be used.

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

Further, instead of using the PET layer as the base material layer 93, a nylon layer may be used, or a PET layer having a metal vapor deposition film on at least one surface and having a gas barrier property may be used, or at least one of them. A nylon layer having a metal vapor deposition film on the surface and having a gas barrier property may be used.

Further, a PET layer having a silica-deposited film on at least one surface and having a gas barrier property may be used, or a nylon layer having a silica-deposited film on at least one surface and having a gas barrier property may be used. ..

Further, a PET layer having an aluminum oxide vapor deposition film on at least one surface and having a gas barrier property may be used, or a nylon layer having an aluminum oxide vapor deposition film on at least one surface and having a gas barrier property may be used. May be good.

When a nylon layer is used, the mechanical strength is often superior to that of the PET layer. Further, the film provided with various thin-film deposition films has a better gas barrier property than the film used as a base material.

As the barrier layer 94, an appropriate one is selected according to a required function such as water vapor or other gas barrier properties, 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 a barrier property such as copper and tin can be used as the metal foil, but it is preferable to use an aluminum foil.

When a vapor-deposited film is used as the barrier layer 94, polyethylene terephthalate (PET), nylon, or the like can be used as the base film of the vapor-deposited film. As the metal to be vapor-deposited on the base film, various metals generally used for metal vapor deposition such as aluminum, copper, and tin can be used. Further, a vapor-deposited film of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide can be provided.

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 surface and having gas barrier properties may be used, or a metal vapor-deposited film having a metal vapor-deposited film on at least one surface and having gas barrier properties may be used. A nylon layer may be used.

Further, a PET layer having a silica-deposited film on at least one surface and having a gas barrier property may be used, or a nylon layer having a silica-deposited film on at least one surface and having a gas barrier property may be used. ..

Further, a PET layer having an aluminum oxide vapor deposition film on at least one surface and having a gas barrier property may be used, or a nylon layer having an aluminum oxide vapor deposition film on at least one surface and having a gas barrier property may be used. May be good.

When a nylon layer is used, the mechanical strength is often superior to that of the PET layer. Further, the film provided with various thin-film deposition films has a better gas barrier property than the film used as a base material.

Further, a gas barrier coating film may be provided on the vapor-deposited film. This suppresses the permeation of oxygen, water vapor, etc., and by providing the film adjacent to the vapor-deposited film, it is possible to effectively prevent the occurrence of cracks in the thin-film film.

The above gas barrier coating film is a hydrolyzate of metal alkoxide 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 method catalyst, water, an organic solvent, or the like. A gas barrier coating film containing at least one resin composition such as a hydrolyzed condensate of a metal alkoxide.

As the material used for the first sealant layer 92 and the second sealant layer 95, the above-mentioned resin may be not only a fossil raw material-derived resin but also a biomass-derived resin. For example, in addition to the above-mentioned biomass-derived polyethylene resin, biomass polyester using biomass-derived ethylene glycol as a diol component as described in Japanese Patent Application Laid-Open No. 2012-116802, polylactic acid resin, cellophane, starch, and cellulose. Etc. can be used. It is preferable to use a plant-derived resin as the biomass-derived resin.

Since the inner surface printing 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, it is possible to print with excellent cosmeticity.

Next, a method of manufacturing the laminated body 90 of the tubular body portion 71 will be described with reference to FIG.
First, printing is performed on the inner surface of the base material layer 93, and an inner surface printing portion 13A made of printing ink is provided on the inner surface of the base material layer 93.

Next, the first sealant layer 92 is laminated on the outer surface of the base material layer 93 by dry laminating.

Next, the barrier layer 94 is laminated on the inner surface of the base material layer 93 by dry lamination. Further, the second sealant layer 95 is bonded to the inner surface of the laminated body of the barrier layer 94 by dry laminating.

As described above, the laminated body 90 of the body portion 71 is obtained. As long as the desired laminated body 90 can be obtained, the method is not limited to the above manufacturing method.

The laminated body 90 of the body portion 71 thus obtained is wound in a cylindrical shape, and both end portions 73A and 73B are overlapped as described above, and the outer surface and the inner surface of the laminated body 90 are formed on both end portions 73A and 73B. It is heat-sealed to form a body sticking portion 72, and a tubular body portion 71 is manufactured. In this case, the first sealant layer 92 provided on the outer surface side of the laminated body 90 and the second sealant layer 95 provided on the inner surface side are melted and joined to obtain a tubular body portion 71.

In the above, the body pasting portion 72 is formed by overlapping, but the end faces of both end portions 73A and 73B may be butted and joined. Further, the joining wire that has been joined together as described above may be protected by attaching a film to the inner surface or the outer surface of the tubular body portion 71. Further, the inner end portion 73B may be processed to protect the end face. For example, there are protection by attaching tape, processing of bending the end portion 73B toward the outside of the container (hemming processing), and the like.

Next, the opening (upper side) 74A of the cylindrical body 71 shown in FIG. 7 is inserted into a mold (not shown), and a method such as compression molding or injection molding is applied to the cylindrical body 71. A tube container 70 is obtained by forming a shoulder portion 75 and a mouth portion 76 in the opening (upper side) 74A of the tubular body portion 71 (see FIG. 1).

Next, the cap 1 is attached to the mouth 76 of the tube container 70 manufactured as described above, and a plurality of tube containers 70 to which the cap 1 is attached are collectively stored in the cardboard box. After that, the plurality of tube containers 70 to which the cap 1 is attached are conveyed for each cardboard box. After that, at the transport destination, the contents such as mustard, wasabi, toothpaste, and other fluids are filled in an appropriate amount, and the opening (lower side) 74B is welded to form the bottom seal portion 79. As a result, a packaged product 70A in which the contents are filled and packaged in the tube container 70 is obtained.

<Example 1>
Caps were manufactured using an injection molding device equipped with a mold. As the thermoplastic resin constituting the cap 1, a mixture of polypropylene and polyethylene was used. As polypropylene, "PM921V (density: 0.90 g / cm ³ , MFR: 25 g / 10 min) manufactured by SunAllomer Ltd." was used. As the polyethylene, “SHA7260 manufactured by Braskem Co., Ltd. (density: 0.955 ^{g / cm 3} , MFR: 20 g / 10 min, biomass degree 94%)”, which is a high-density polyethylene derived from biomass, was used. The mixing ratio of polypropylene and polyethylene was set to 3: 7 on a mass basis. That is, the polypropylene content ratio was set to 30% by mass.

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 required for the molten thermoplastic resin flowing in from the sprue, which is the inflow port of the mold, to completely fill the cavity composed of the mold. The cycle time is the time from closing the mold to taking out the molded product, and is the time required to manufacture one cap 1.

The laminated body 90 constituting the body portion 71 was manufactured as follows. Specific configurations of each layer constituting the laminate 90 include an LLDPE film having a thickness of 130 μm as the first sealant layer 92, a PET film having a thickness of 12 μm as the base material layer 93, a VM-PET film having a thickness of 12 μm as the barrier layer 94, and a second layer. An LLDPE film having a thickness of 100 μm was used as the sealant layer 95. As the VM-PET film, an aluminum-deposited PET film was used. The LLDPE film used for the first sealant layer 92 is formed by adding an antistatic agent. Depending on the application, it may not be necessary to add an antistatic agent.

Specifically, first, the inner surface printing portion 13A was formed on the inner surface side of the PET film having a thickness of 12 μm as the base material layer 93. Next, a 130 μm-thick LLDPE film to be the first sealant layer 92 was attached to the outer surface of the 12 μm-thick PET film to be the base material layer 93 by dry lamination. As an LLDPE film having a thickness of 130 μm as the first sealant layer 92, an MFR (Melt Flow Rate) 1.9 g / 10 min, a density of 0.92 g / cm ³ , and a melting point of 118 ° C. was used.

Next, a VM-PET film having a thickness of 12 μm, which serves as a barrier layer 94, was attached to the inner surface of the base material layer 93 by dry lamination. As a result, a laminated body in which the first sealant layer 92, the base material layer 93, and the barrier layer 94 were laminated was obtained.

Next, an LLDPE film having a thickness of 100 μm, which serves as the second sealant layer 95, was attached to the inner surface of the barrier layer 94 by dry lamination. As the LLDPE film having a thickness of 100 μm to be the second sealant layer 95, an MFR (Melt Flow Rate) 1.9 g / 10 min, a density of 0.92 g / cm ³ , and a melting point of 118 ° C. are used as in the case of the first sealant layer 92. board. However, no antistatic agent was added to the second sealant layer 95.

Next, the barrier layer 94 side of the laminated body in which the first sealant layer 92, the base material layer 93, and the barrier layer 94 were laminated, and the second sealant layer 95 were laminated by dry lamination.

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.

Further, the laminated body 90 is wound in a cylindrical shape, both end portions 73A and 73B are overlapped as described above, and the outer surface and the inner surface of the laminated body 90 are heat-sealed at both end portions 73A and 73B to form a body sticking portion 72. , A tubular body 71 was produced. The inner diameter of the tubular body 71 that specifies the tube shape was 38 mm. Next, the opening 74A of the tubular body 71 is inserted into the mold, and the tubular body 71 is compression-molded, and the shoulder 75 and the mouth are inserted into the opening 74A of the tubular body 71. Part 76 was formed. Then, 90 g of paste-like toothpaste (dentifrice) was filled as the content from the other opening 74B of the tubular body 71. Then, the opening 74B was welded to form the bottom seal portion 79, and a tube container 70 filled and packaged with the contents was produced. Then, by screwing the screw structure of the inner surface of the cap 1 and the outer surface of the mouth portion 76 of the tube container 70, which are separately produced, the cap 1 is attached to the tube container 70, and the tube container with a cap filled with the contents is filled. Got

<Example 2>
The mixing ratio of polypropylene and polyethylene was set to 7: 3 on a mass basis. That is, a cap was produced in the same manner as in Example 1 except that the polypropylene content ratio was 70% by mass. Further, a tube container 70 was prepared 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.

<Comparative example 1>
Polypropylene was used as the thermoplastic resin constituting the cap 1. That is, the polypropylene content ratio was set to 100% by mass. As polypropylene, "PM921V (density: 0.9 g / cm ³ , MFR: 25 g / 10 min) manufactured by SunAllomer Ltd." was used. Except for this, a cap was produced in the same manner as in Example 1. Further, a tube container 70 was prepared 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.

<Comparative example 2>
Polyethylene was used as the thermoplastic resin constituting the cap 1. That is, the polyethylene content was set to 100% by mass. As the polyethylene, “SHA7260 manufactured by Braskem Co., Ltd. (density: 0.955 ^{g / cm 3} , MFR: 20 g / 10 min, biomass degree 94%)”, which is a high-density polyethylene derived from biomass, was used. Except for this, a cap was produced in the same manner as in Example 1. Further, a tube container 70 was prepared 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.

<Evaluation>
The tube containers with caps of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated using two indexes of "hinge elasticity" and "content leakage".

Regarding the hinge elasticity, two measurements of closing elasticity and opening elasticity were performed using a "popular mechanical force gauge FB100N" manufactured by Imada Co., Ltd. as a push-pull gauge. Regarding the closing elasticity, when the outer surface 34 of the lid portion 30 of the cap 1 is pushed by the pressing force measuring shaft of the push-pull gauge from the state where the cap 1 is opened, and the lid portion 30 is about to be fitted. The peak value of the indentation strength up to was closed and measured as elasticity.

Regarding the opening elasticity, the protruding portion 36 of the lid portion 30 is pushed by the push-pull gauge in the state where the lid portion 30 of the cap 1 is disengaged, that is, the engaging rib 39 and the locking rib 18 are disengaged. Using the tensile force measuring shaft, the peak value of the tensile strength until the lid portion 30 was completely opened was opened and measured as elasticity.

For content leakage, the tube container 70 is fitted with a cap 1, and with the cap 1 closed, 100 g of a reagent (water: ethanol = 5: 5 solution colored with methylene blue) is filled in the tube container 70. , Stored in an inverted state at room temperature (20 ° C.) for 24 hours. After storage, the filling reagent was discharged and dried in a Dry environment at 50 ° C., and then the leak state of the reagent from the tube container 70 was visually confirmed. The judgment of the leak state was as follows: ◯: the liquid stopped up to the inner ring 27, Δ: the liquid stopped up to the contact ring 28, and ×: the liquid leaked to the mounting portion 23 provided with the screw structure 24. Table 1 shows the evaluation results of Examples 1 and 2 and Comparative Examples 1 and 2.

From the evaluation results shown in Table 1, it was confirmed that the hinge elasticity of Comparative Example 2 (HDPE 100%) was significantly lower than that of Comparative Example 1 (100% polypropylene) in both closing elasticity and opening elasticity. Was done. Further, it was confirmed that the hinge elasticity was improved as the polyethylene content decreased in Examples 1 and 2 as compared with Comparative Example 2. In Examples 1 and 2, the closing elasticity was 0.40N or more, and the opening elasticity was 0.32N or more, both showing appropriate values.

Further, from the evaluation results shown in Table 1, the content leakage property was Δ in Comparative Example 1 (100% polypropylene), which was higher than that when the content leakage reached the contact ring. In Comparative Example 2 and Examples 1 and 2, the result was 〇, and the leakage of the contents stopped at the contact ring. From this result, it was confirmed that the contents leakability was high in Examples 1 and 2.

Comprehensively judging based on the evaluation results in Table 1, there is a trade-off relationship between hinge elasticity and content leakage, but the content is maintained while maintaining a balance between the two and improving the operability of opening and closing the cap by the hinge elasticity. The cap 1 is composed of a mixture of polypropylene and polyethylene in order to reduce the leakage of substances, and the polypropylene content is 30% by mass or more and 70% by mass or less (30% by mass to 70% by mass). It is preferable to have.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, as the cap of the tube container, a screw type having a screw structure on the outer peripheral surface of the mouth portion and the inside of the cap body is used, but if it has a hinge, only linear motion in the vertical direction is used. A type that is attached to the tube container by other means, such as a type that is connected by so-called one-touch fitting, in which the cap is attached to and detached from the container, may be used.

Further, in the above embodiment, the laminate has a structure in which a barrier layer is provided between the base material layer and the second sealant layer, but it is not always necessary to provide the barrier layer, and it is appropriately provided according to the characteristics of the contents. be able to.

1 ... Cap 10 ... Cap body 11 ... Nozzle 12 ... Substrate 13 ... Inner surface 14 ... Body 15 ... Recess 16 ... Outer surface 17 ... Step 18 ... Locking rib 19 ... Locking protrusion 20 ... Lower cylinder part 21 ... Upper cylinder part 22 ... Restriction plate 23 ... Mounting part 24 ... Screw structure 25 ...・ Reinforcing rib 26 ・ ・ ・ Thick part 27 ・ ・ ・ Inner ring 28 ・ ・ ・ Contact ring 30 ・ ・ ・ Lid part 31 ・ ・ ・ Closure plate 32 ・ ・ ・ Inner surface 33 ・ ・ ・ Side part 34 ・ ・ ・Outer surface 35 ・ ・ ・ Recessed part 36 ・ ・ ・ Protruding part 37 ・ ・ ・ First closing rib 38 ・ ・ ・ Second closing rib 39 ・ ・ ・ Engaging rib 50 ・ ・ ・ Hinge 70 ・ ・ ・ Tube container 71 ・ ・ ・・ Body 72 ・ ・ ・ Body pasting 73A ・ ・ ・ Bonding end 73B that becomes the outside when the body is pasted 73B ・ ・ ・ Bonding end 74A that becomes the inside when the body is pasted 74A ・ ・ ・ Opening (upper side) )
74B ・ ・ ・ Opening (lower side)
75 ... Shoulder 76 ... Mouth 77 ... Screw structure 78 ... Head molded body 79 ... Bottom seal 90 ... Laminated body (of body 71 of tube container 70) 92・ ・ ・ First sealant layer 93 ・ ・ ・ Base material layer 94 ・ ・ ・ Barrier layer 95 ・ ・ ・ Second sealant layer

Claims (5)

A hinged cap that is attached to a tube container provided with a mouth portion that is a discharge port and closes the mouth portion.
The cap is made of a mixture of polypropylene and polyethylene, and has a hinged cap having a polypropylene content of 30% by mass or more and 70% by mass or less. The hinged cap according to claim 1, wherein the polyethylene is a high-density polyethylene. The cap with a hinge according to claim 1 or 2, wherein the polyethylene contained in the cap contains a polyethylene derived from biomass obtained by polymerizing a monomer containing ethylene derived from biomass. The hinged cap according to any one of claims 1 to 3,
A tube container having the mouth portion and having at least a first sealant layer, a base material layer, and a second sealant layer as a body portion and the body portion and the shoulder portion joined to each other.
A tubing container with a cap, characterized in that it comprises. The tube container with a cap according to claim 4, wherein the polyethylene constituting the mouth portion is high-density polyethylene.

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