JP2020164179A - Synthetic resin container - Google Patents

Abstract

To provide a synthetic resin container reduced in weight of a mouth.SOLUTION: A synthetic resin container 100 related to the present disclosure has a cylindrical mouth 10 for spouting a content. The mouth 10 has an engaging part formed on an outer peripheral wall 11 of the mouth 10, a bead ring 13 provided under the engaging part and protruded outward the radial direction from the outer peripheral wall 11, a grip part 15 provided right below the bead ring 13 and having an outer diameter smaller than the outer peripheral wall 11, and a neck ring 17 provided under the grip part 15 and protruded outward the radial direction from the grip part 15. An outer peripheral part of the bead ring 13 is provided with ratchet pawls 13a formed asymmetrically in the circumferential direction and protruded outward the radial direction. A radius of the neck ring 17 is longer than the distance from a central axis O of the mouth 10 to an outer peripheral end of the ratchet pawl 13a, and the distance from the central axis O to the outer peripheral end of the ratchet pawl 13a is longer than the distance from the central axis O to the outer peripheral end of the engaging part.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a synthetic resin container provided with a tubular mouth portion and a body portion connected to the mouth portion to form a storage space for contents.

As a synthetic resin container capable of accommodating contents such as cosmetics and beverages, for example, as shown in Patent Document 1, it is made of synthetic resin having a tubular mouth portion and a body portion forming an accommodating space for the contents. The container is known. In this type of synthetic resin container, for example, as shown in Patent Document 2, efforts are being made to reduce the amount of resin by thinning the body and bottom for the purpose of considering environmental problems and reducing costs. There is.

JP-A-2002-121607 Japanese Unexamined Patent Publication No. 2003-104343

By the way, in the synthetic resin container as described above, the wall thickness of the mouth portion is generally formed to be the thickest from the viewpoint of ensuring airtightness when the cap is attached. Therefore, the conventional synthetic resin container still has room for improvement in terms of further weight reduction of the mouth portion.

An object of the present disclosure is to solve such a problem, and an object of the present invention is to propose a synthetic resin container capable of reducing the weight of the mouth.

The synthetic resin container of the present disclosure is
A synthetic resin container having a tubular mouth for pouring out the contents, a body that is connected below the mouth to form a storage space for the contents, and a bottom that closes the lower end of the body. hand,
The mouth portion is provided with an engaging portion formed on the outer peripheral wall of the mouth portion, a bead ring provided below the engaging portion and projecting radially outward from the outer peripheral wall, and directly below the bead ring. It has a grip portion having an outer diameter smaller than that of the outer peripheral wall, and a neck ring provided below the grip portion and projecting radially outward from the grip portion.
A ratchet claw that protrudes outward in the radial direction and is asymmetrically formed in the circumferential direction is provided on the outer peripheral portion of the bead ring.
The radius of the neck ring is longer than the distance from the central axis of the mouth to the outer peripheral edge of the ratchet claw.
The distance from the central axis to the outer peripheral end of the ratchet claw is longer than the distance from the central axis to the outer peripheral end of the engaging portion.

Further, in the synthetic resin container of the present disclosure, in the above configuration, the engaging portion is preferably a male screw portion formed on the outer peripheral wall of the mouth portion.

Further, in the synthetic resin container of the present disclosure, in the above configuration, it is preferable that the wall thickness of the outer peripheral wall on which the engaging portion is formed is thinner than the wall thickness of the grip portion.

According to the present disclosure, it is possible to propose a synthetic resin container capable of reducing the weight of the mouth portion.

It is a front view of the synthetic resin container which concerns on one Embodiment of this disclosure. It is an enlarged front view of the mouth part in FIG. It is an enlarged plan view of the mouth part of the synthetic resin container which concerns on one Embodiment of this disclosure.

Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

FIG. 1 shows a synthetic resin container 100, which is an embodiment of the present disclosure. The synthetic resin container 100 has a mouth portion 10 for pouring out contents such as cosmetics and beverages, a body portion 20 which is connected below the mouth portion 10 to form a storage space for the contents, and a lower end of the body portion 20. It includes a bottom 30 to be closed. In the present specification, claims, abstract and drawings, the side where the mouth portion 10 is located is referred to as the upper side (upper side in FIG. 1), and the side where the bottom portion 30 is located is referred to as the lower side (lower side in FIG. 1). To do. Further, the radial outer side is a direction toward the outside along a straight line perpendicular to the central axis O through the central axis O of the synthetic resin container 100 in FIG. 1, and the radial inner side is along the straight line. It shall mean the direction toward the central axis O. Further, the outer peripheral wall 11 (see FIG. 2) of the mouth portion 10 refers to a tubular portion on which the male screw portion 11a, which is the engaging portion, is formed.

In the present embodiment, the synthetic resin container 100 can be formed, for example, by performing biaxial stretch blow molding on a preform formed by means such as injection molding, compression molding, extrusion molding and the like. Further, the synthetic resin container 100 can also be formed by performing extrusion blow molding on a parison formed of a synthetic resin material. Here, as the preform material, for example, a synthetic resin material such as low-density polyethylene (LDPE), high-density polyethylene resin (HDPE), polypropylene (PP), polyethylene terephthalate (PET), etc., which exhibits stretchability by heating is used. be able to.

Further, the synthetic resin container 100 may be formed by liquid blow molding using a pressurized liquid instead of the pressurized air as a pressurizing medium for the preform. When the synthetic resin container 100 is formed by liquid blow molding, a liquid content (cosmetics, beverage, etc.) may be used as the pressure medium.

Next, the configuration of the mouth portion 10 of the synthetic resin container 100 will be described. In the present embodiment, the mouth portion 10 has a tubular shape as shown in FIGS. 2 and 3. The mouth portion 10 includes a male screw portion 11a (engagement portion) formed on the outer peripheral surface 11b of the outer peripheral wall 11, a bead ring 13 provided below the male screw portion 11a and projecting radially outward from the outer peripheral wall 11, and a bead. A grip portion 15 provided directly below the ring 13 and having an outer diameter C (see FIG. 2) smaller than the outer diameter B (see FIG. 2) of the outer peripheral wall 11, and a diameter from the grip portion 15 provided below the grip portion 15. It is provided with a neck ring 17 projecting outward in the direction.

The male screw portion 11a is an engaging portion for attaching a cap, a discharge tool, or the like to the mouth portion 10 by screw engagement, and is integrally formed on the outer peripheral wall 11 of the mouth portion 10. In addition, as the engaging portion, instead of the male screw portion 11a, an annular protrusion portion for engaging the cap or the like with the mouth portion 10 by tapping may be formed. Further, both the male screw portion 11a and the engaging protrusion may be provided as the engaging portion, and both may be used properly according to the attached object.

The bead ring 13 is provided below the male screw portion 11a, and is an annular portion that protrudes radially outward from the outer peripheral wall 11. In the present embodiment, the bead ring 13 is provided to increase the mechanical strength of the mouth portion 10, and by providing the ratchet claw 13a on the outer peripheral portion thereof, the pilfer proof cap (shown) is provided on the mouth portion 10. The proof ring can be engaged with the ratchet claw 13a to prevent it from rotating together with the cap body when the proof ring is attached. The pilfer proof cap is composed of a cap body and a proof ring separably connected to the lower end of the cap body. As a result, the cap body can be separated from the proof ring with a small rotation angle. Further, as will be described later, by attaching an arm portion for transporting the synthetic resin container 100 to the lower surface of the bead ring 13, the synthetic resin container 100 can be accurately grasped and transported.

The ratchet claw 13a is a claw portion that protrudes radially outward from the outer peripheral portion of the bead ring 13, and is formed from the upper surface of the bead ring 13 to the outer peripheral surface. Further, the ratchet claw 13a is formed asymmetrically in the circumferential direction. That is, as shown in FIG. 3, the ratchet claw 13a has a first inclined surface 13b1 that gently goes inward in the radial direction from the outermost peripheral end of the ratchet claw 13a in one direction in the circumferential direction, and the other direction in the circumferential direction. It is provided with a second inclined surface 13b2 that steeply faces inward in the radial direction. In the present embodiment, as shown in FIG. 3, the second inclined surface 13b2 is a surface extending substantially along the radial direction. As a result, the ratchet claw 13a engages with the engaging portion provided on the inner surface of the proof ring when the pilfer proof cap is turned in the opening direction (counterclockwise in the plan view shown in FIG. 3) to proof. The rotation of the ring can be prevented. In this embodiment, as shown in FIG. 3, six ratchet claws 13a are arranged. The ratchet claws 13a are similarly provided at positions where three ratchet claws 13a arranged at substantially equal intervals in the circumferential direction face each other with respect to the central axis O. However, the present invention is not limited to this example, and one or more arbitrary number of ratchet claws 13a can be provided.

In the present embodiment, since the ratchet claw 13a is used to prevent the proof ring on the pilfer proof cap side from rotating, a shear load in the circumferential direction is applied to the ratchet claw 13a. Therefore, the bead ring 13 provided with the ratchet claw 13a may also have mechanical strength to withstand the shear load in the circumferential direction. On the other hand, for example, in the container shown in Patent Document 1, since the tamper evidence band is adopted, when the cap is removed for the first time, the locking flap folded back at the lower end portion of the tamper evidence band is the locking jaw portion (the present application). Since a bending load is applied to the bead ring 13), the locking jaw portion and the bottle mouth portion that supports the locking jaw portion must have a thickness that can withstand the bending load. In this respect, the mouth portion 10 of the present embodiment can thin the bead ring 13 and the portion supporting the bead ring 13. Therefore, the weight of the mouth portion 10 can be reduced.

The grip portion 15 is formed directly below the bead ring 13 and has an outer diameter C smaller than the outer diameter B of the outer peripheral wall 11. By making the outer diameter C of the grip portion 15 smaller than the outer diameter B of the outer peripheral wall 11, the exposed area of the lower surface of the bead ring 13 can be increased. As a result, the contact area when the arm portion of the transfer device is attached to the lower surface of the bead ring 13 can be increased, so that the synthetic resin container 100 can be accurately grasped and conveyed.

In this embodiment, as shown by the broken line in FIG. 2, the wall thickness of the outer peripheral wall 11 is thinner than the wall thickness of the grip portion 15. The weight of the mouth portion 10 can be reduced by reducing the wall thickness of the upper portion of the mouth portion 10 which is less likely to receive a large load.

Below the grip portion 15, a neck ring 17 that projects radially outward from the outer surface of the grip portion 15 is provided. The neck ring 17 is used, for example, as a reference surface when mounting the preform on the blow molding die when the synthetic resin container 100 is biaxially stretched and blow molded.

In the present embodiment, the radius of the neck ring 17 (D / 2 in FIG. 2) is longer than the distance from the central axis O of the mouth portion 10 to the outer peripheral end of the ratchet claw 13a (E / 2 in FIG. 2). It is configured in. As a result, the cap can be designed so that the outer diameter of the cap attached to the mouth portion 10 does not become larger than the outer diameter D of the neck ring 17, so that the appearance of the entire synthetic resin container 100 to which the cap is attached is improved. can do. In this case, it is preferable that the outer diameter of the peripheral wall of the cap and the outer diameter of the neck ring 17 are the same.

Further, in the present embodiment, the distance from the central axis O of the mouth portion 10 to the outer peripheral end of the ratchet claw 13a (E / 2 in FIG. 2) is the distance from the central axis O to the outer peripheral end of the male screw portion 11a (FIG. 2). It is configured to be longer than A / 2) of. Thereby, when the pilfer proof cap is attached to the mouth portion 10, the cap side can be designed so that the engaging portion on the inner surface of the proof ring does not interfere with the male screw portion 11a. The distance (A / 2) from the central axis O to the outer peripheral end of the male screw portion 11a is configured to be larger than the radius of the portion of the bead ring 13 excluding the ratchet claw 13a.

In the present embodiment, it is premised that the arm portion of the transport device grips the grip portion 15 directly below the bead ring 13 and transports the synthetic resin container 100. Therefore, for example, after setting the preform in the blow molding die with the neck ring 17 as the reference surface and performing biaxial stretching blow molding, the grip portion 15 is attached to the arm portion before the release of the synthetic resin container 100. The synthetic resin container 100 can be transported immediately after grasping and releasing the mold. In particular, when liquid blow molding is performed on the contents with the neck ring 17 as a reference surface, the grip portion 15 is grasped by the arm portion before the mold release of the synthetic resin container 100, and the cap portion is transported after the mold release and the cap is immediately attached. Therefore, the possibility of the contents spilling from the mouth portion 10 can be reduced.

As described above, the synthetic resin container 100 according to the present embodiment has a tubular mouth portion 10 for pouring out the contents and a body portion 20 which is connected below the mouth portion 10 to form a storage space for the contents. A synthetic resin container 100 including a bottom portion 30 that closes the lower end of the body portion 20, and the mouth portion 10 is an engaging portion formed on the outer peripheral wall 11 of the mouth portion 10 and a lower portion of the engaging portion. A bead ring 13 provided in the outer peripheral wall 11 protruding outward in the radial direction, a grip portion 15 provided directly below the bead ring 13 and having an outer diameter smaller than that of the outer peripheral wall 11, and a grip provided below the grip portion 15. The neck ring 17 has a neck ring 17 protruding outward in the radial direction from the portion 15, and a ratchet claw 13a protruding outward in the radial direction and formed asymmetrically in the circumferential direction is provided on the outer peripheral portion of the bead ring 13. The diameter (D / 2) is longer than the distance (E / 2) from the central axis O of the mouth portion 10 to the outer peripheral end of the ratchet claw 13a, and the distance from the central axis O to the outer peripheral end of the ratchet claw 13a (E / 2). 2) is configured to be longer than the distance (A / 2) from the central axis O to the outer peripheral end of the engaging portion. By adopting such a configuration, the bead ring 13 need only have mechanical strength to withstand the shear load in the circumferential direction applied to the ratchet claw 13a, and the wall thickness of the bead ring 13 can be reduced. it can. Therefore, the weight of the mouth portion 10 can be reduced.

Further, since the exposed area of the lower surface of the bead ring 13 can be increased, the contact area when the arm portion of the transport device is attached to the lower surface of the bead ring 13 can be increased. Therefore, the synthetic resin container 100 can be accurately grasped and transported.

Further, since the cap can be designed so that the outer diameter of the cap attached to the mouth portion 10 does not become larger than the outer diameter D of the neck ring 17, the appearance of the entire synthetic resin container 100 to which the cap is attached is improved. be able to.

Further, when the pilfer proof cap is attached to the mouth portion 10, the cap side can be designed so that the engaging portion on the inner surface of the proof ring does not interfere with the male screw portion 11a.

Further, in the present embodiment, the engaging portion is configured to be a male screw portion 11a formed on the outer peripheral wall 11 of the mouth portion 10. By adopting such a configuration, even if the pilfer proof cap is rotated around the central axis O to open it, the proof ring engages with the ratchet claw 13a and does not rotate together with the cap body, so that the cap body is rotated less. Can be separated from the proof ring at the corner.

Further, in the present embodiment, the wall thickness of the outer peripheral wall 11 on which the male screw portion 11a (engagement portion) is formed is thinner than the wall thickness of the grip portion 15. By adopting such a configuration, it is possible to reduce the thickness of the upper portion of the mouth portion 10 which is less likely to receive a large load and reduce the weight of the mouth portion 10.

Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these modifications and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and a plurality of components can be combined or divided into one. It should be understood that these are also included in the scope of the present invention.

For example, in the present embodiment, the wall thickness of the outer peripheral wall 11 on which the male screw portion 11a (engagement portion) is formed is configured to be thinner than the wall thickness of the grip portion 15, but the present embodiment is limited to this embodiment. Not done. The wall thickness of the grip portion 15 may be equal to the wall thickness of the outer peripheral wall 11 on which the male screw portion 11a is formed, or the wall thickness of the outer peripheral wall 11 on which the male screw portion 11a is formed is thicker. It may be configured to be.

According to the present disclosure, it is possible to propose a synthetic resin container 100 capable of reducing the weight of the mouth portion 10.

10 Mouth 11 Outer wall 11a Male thread 11b Outer surface 13 Bead ring 13a Ratchet claw 13b1 First inclined surface 13b2 Second inclined surface 15 Grip part 17 Neck ring 20 Body part 30 Bottom part 100 Synthetic resin container O Center axis

Claims (3)

A synthetic resin container having a tubular mouth for pouring out the contents, a body that is connected below the mouth to form a storage space for the contents, and a bottom that closes the lower end of the body. hand,
The mouth portion is provided with an engaging portion formed on the outer peripheral wall of the mouth portion, a bead ring provided below the engaging portion and projecting radially outward from the outer peripheral wall, and directly below the bead ring. It has a grip portion having an outer diameter smaller than that of the outer peripheral wall, and a neck ring provided below the grip portion and projecting radially outward from the grip portion.
A ratchet claw that protrudes outward in the radial direction and is asymmetrically formed in the circumferential direction is provided on the outer peripheral portion of the bead ring.
The radius of the neck ring is longer than the distance from the central axis of the mouth to the outer peripheral edge of the ratchet claw.
A synthetic resin container characterized in that the distance from the central axis to the outer peripheral end of the ratchet claw is longer than the distance from the central axis to the outer peripheral end of the engaging portion. The synthetic resin container according to claim 1, wherein the engaging portion is a male screw portion formed on the outer peripheral wall of the mouth portion. The synthetic resin container according to claim 1 or 2, wherein the wall thickness of the outer peripheral wall on which the engaging portion is formed is thinner than the wall thickness of the grip portion.

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