JP7638142B2 - Double container - Google Patents

Description

The present invention relates to a double container.

Conventionally, as shown in, for example, Patent Document 1 below, there has been known a double container that includes an inner container that reduces in volume as the contained contents decrease, and an outer container in which the inner container is placed, and in which the mouth, body, and bottom are arranged in that order from top to bottom along the bottle axial direction, and which has an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease.

JP 2018-30614 A

However, with the conventional double-walled container, when the body elastically deforms radially inward, the outer peripheral surface of the inner container comes into close contact with the inner peripheral surface of the outer container, and the inner peripheral surface of the outer container and the outer peripheral surface of the inner container rub against each other, which can cause a squeaking noise. When this happens, there is also a risk of wrinkles forming in the outer container and the inner container.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a double-walled container that can suppress the generation of creaking noises and wrinkles when the body elastically deforms radially inward.

The present invention employs the following means to solve the above problems. That is, the double container of the present invention comprises an inner container that undergoes volume reduction deformation as the contained contents decrease, and an outer container in which the inner container is housed, and has a mouth, a body, and a bottom that are arranged in this order from top to bottom along the bottle axial direction, and has an outside air introduction hole that introduces outside air between the outer container and the inner container as the contents decrease, at least the body of the outer container is formed to be elastically deformable, and each body of the outer container and the inner container has a plurality of inclined ribs that extend in a first direction that is inclined in the bottle axial direction and circumferential direction when viewed from the outside in the radial direction. However, when viewed from the outside in the radial direction, they are spaced apart in a second direction perpendicular to the first direction, the diameter of the upper part of the body on the mouth side is smaller than the diameter of the lower part on the bottom side, the inclined ribs are formed across the upper and lower parts of the body, the body extends radially outward as it goes from top to bottom, and the upper part of the body has a curved shape that is recessed radially inward when viewed in vertical cross section along the bottle axis, and a plurality of vertical ribs extending in the bottle axial direction are formed on the body at intervals in the circumferential direction, and the inclined ribs are divided into the vertical ribs .

In the present invention, the body of each of the outer container and the inner container is provided with a plurality of inclined ribs extending in a first direction inclined in the bottle axial direction and circumferential direction as viewed from the outside in the radial direction, spaced apart in a second direction perpendicular to the first direction, so that when the body is elastically deformed toward the inside in the radial direction, the inclined ribs widen, making it easier to stretch the body in the second direction. Therefore, during this elastic deformation, it is possible to suppress the occurrence of wrinkles in the outer container and the inner container, and it is easy to generate a starting point of peeling between the inner circumferential surface of the outer container and the outer circumferential surface of the inner container, and it is possible to suppress the inner container from becoming one with the deformation of the outer container in a predetermined area of the body that is pressed toward the inside in the radial direction. As a result, it is possible to suppress the inner circumferential surface of the outer container and the outer circumferential surface of the inner container from rubbing against each other when the body is elastically deformed toward the inside in the radial direction, and it is possible to suppress the occurrence of squeaking noise.
Since the diameter of the upper part of the body is smaller than the diameter of the lower part of the body, ground contact stability can be improved, and even if the upper part of the body, which has higher rigidity than the lower part, is pressed radially inward, the inclined rib can be widened to make it easier to stretch the upper part of the body in the second direction, effectively suppressing the occurrence of creaking noises and wrinkles.
In the body portion, an inclined rib is provided in the pressed portion located between adjacent vertical ribs in the circumferential direction and pressed radially inward, thereby ensuring the above-mentioned functional effects.

This invention makes it possible to suppress creaking noises and wrinkles that occur when the body is elastically deformed radially inward.

FIG. 2 is a side view including a partial vertical cross section of a double container shown as one embodiment, as viewed from the outside in the radial direction.

Hereinafter, a double container according to one embodiment will be described with reference to the drawings.
1, the double container 1 includes an inner container 12 that undergoes volume reduction deformation as the contained contents decrease, and an outer container 11 in which the inner container 12 is housed. The outer surface of the inner container 12 is provided so as to be separable from the inner surface of the outer container 11. In the example shown in the figure, the inner container 12 is highly flexible and is laminated on the inner surface of the outer container 11 in a manner that allows the inner container 12 to be peeled away from the inner surface.
In addition, a gap may be provided between the inner surface of the outer container 11 and the outer surface of the inner container 12.

The double container 1 is formed by integrally blow molding the outer preform and the inner preform, with the inner preform for forming the inner container 12 fitted into the outer preform for forming the outer container 11. In other words, the double container 1 is a biaxially stretched blown container.

The inner container 12 and the outer container 11 are made of synthetic resin material, and may be made of the same material or different materials. Examples of synthetic resin materials include PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), nylon (polyamide), and EVOH (ethylene-vinyl alcohol copolymer).

The double container 1 includes a mouth 13, a shoulder 15, a body 16, and a bottom 14. The mouth 13, the shoulder 15, the body 16, and the bottom 14 are arranged coaxially with a common axis and are arranged in this order along the common axis.
Hereinafter, this common axis will be referred to as the bottle axis O, with the mouth 13 side along the bottle axis O being referred to as the upper side, and the bottom 14 side along the bottle axis O being referred to as the lower side. When viewed from the bottle axis O direction, the direction intersecting the bottle axis O will be referred to as the radial direction, and the direction going around the bottle axis O will be referred to as the circumferential direction.

The mouth 13 of the double container 1 is formed by stacking the mouth of the inner container 12 and the mouth of the outer container 11, the shoulder 15 of the double container 1 is formed by stacking the shoulder of the inner container 12 and the shoulder of the outer container 11, the body 16 of the double container 1 is formed by stacking the body of the inner container 12 and the body of the outer container 11, and the bottom 14 of the double container 1 is formed by stacking the bottom of the inner container 12 and the bottom of the outer container 11.
In the following description, unless otherwise specified, it is assumed that both the inner container 12 and the outer container 11 have the same shape.

The size of the double container 1 in the bottle axis O direction is, for example, 115 mm or more and 220 mm or less. The capacity of the double container 1 is, for example, 150 ml or more and 600 ml or less. In the illustrated example, the size of the double container 1 in the bottle axis O direction is about 150 mm, and the double container 1 is for a capacity of 200 ml.
The double container 1 has a circular shape in cross section perpendicular to the bottle axis O over its entire length in the bottle axis O direction.

A flange portion 12a is formed at the upper end of the mouth of the inner container 12, protruding radially outward and extending continuously over the entire circumferential length. The flange portion 12a is placed on the upper opening edge of the mouth of the outer container 11.
On the outer peripheral surface of the mouth of the outer container 11, there are formed, in this order from top to bottom, a male threaded portion 18 onto which a cap (not shown) is screwed, a sealed protrusion 19 onto which the peripheral wall portion of the cap (not shown) is fitted, and a neck ring 20.

The sealed projection 19 and the neck ring 20 project radially outward from the mouth of the outer container 11 and extend continuously over the entire circumferential length.
An airtight seal is formed between the outer peripheral surface of the sealed protrusion 19 and the inner peripheral surface of the peripheral wall of the cap (not shown). The neck ring 20 is provided at the lower end of the mouth of the outer container 11. The outer diameter of the neck ring 20 is larger than the outer diameter of the sealed protrusion 19. The neck ring 20 is located below the peripheral wall of the cap.
The cap may be fitted to the mouth of the outer container 11 by undercut fitting.

An outside air introduction hole 17 is formed at the mouth of the outer container 11 to introduce outside air between the outer container 11 and the inner container 12 as the content decreases. The outside air introduction hole 17 is located at the radially outermost part of the sealed protrusion 19, and is located above the sealing surface that extends continuously over the entire circumferential length.
The position where the outside air introduction hole 17 is formed is not limited to the mouth of the outer container 11, but may be, for example, the body, shoulder, or bottom of the outer container 11 other than the mouth, or it may be between the upper opening edge of the mouth of the outer container 11 and the underside of the flange portion 12a of the inner container 12, etc.

The shoulder portion 15 extends radially outward from the lower end of the mouth portion 13 downward.
The bottom portion 14 is formed in a cylindrical shape with a bottom. A peripheral wall portion 14b of the bottom portion 14 extends radially inward as it extends downward.

The diameter of the upper part of the body 16 on the mouth 13 side is smaller than the diameter of the lower part on the bottom 14 side. The body 16 extends radially outward from the top to the bottom. The upper part of the body 16 has a curved shape recessed radially inward in a vertical cross section along the bottle axis O. The upper part of the body 16 may have a straight line in the vertical cross section.
The outer circumferential surface at the connection between the body 16 and the peripheral wall 14b of the bottom 14 is the maximum outer diameter portion of the double container 1. The outer diameter of this maximum outer diameter portion is, for example, 58 mm or more and 74 mm or less. In the illustrated example, the outer diameter of the maximum outer diameter portion of the double container 1 is about 63 mm.

A number of vertical ribs 22 extending in the direction of the bottle axis O are formed on the body 16 at intervals in the circumferential direction. The vertical ribs 22 are integrally formed from the connection between the mouth 13 and the shoulder 15, through the shoulder 15, to the lower end of the body 16. The vertical ribs 22 extend straight in the direction of the bottle axis O. The vertical ribs 22 are ridges that protrude radially outward, or grooves that are recessed radially inward. The lower end of the vertical ribs 22 is located above the maximum outer diameter portion of the double container 1.

The vertical ribs 22 do not necessarily have to be provided. The vertical ribs 22 may be provided only on the body 16, not on the shoulders 15, etc. The vertical ribs 22 may have a curved configuration, for example, when viewed from the outside in the radial direction.

The vertical rib 22 is located radially inward from the maximum outer diameter portion of the double container 1 .
This makes it possible to prevent damage such as tears to the labels attached to the double containers 1 caused by vibrations, for example, when transporting a carton containing multiple double containers 1.

At least the body of the outer container 11 is capable of being squeezed (elastically deformed), and the inner container 12 shrinks and deforms in response to the squeeze deformation of the outer container 11. The body 16, shoulder 15, and bottom 14 are connected without any steps in the direction of the bottle axis O.

In this embodiment, the body of each of the outer container 11 and the inner container 12 is provided with a plurality of inclined ribs 21 that extend in a first direction inclined in the direction of the bottle axis O and in the circumferential direction when viewed from the outside in the radial direction, and are spaced apart in a second direction perpendicular to the first direction when viewed from the outside in the radial direction.

The inclined ribs 21 extend straight in the first direction. The inclined ribs 21 are ridges that protrude radially outward, or grooves that are recessed radially inward. The multiple inclined ribs 21 all extend in the same direction when viewed from the outside in the radial direction. The width of the inclined ribs 21 is narrower than the width of the vertical ribs 22. The width and pitch of the inclined ribs 21 are set so that three or more inclined ribs 21 are pressed by one fingertip when the body 16 is pressed radially inward.

The inclined rib 21 is integrally formed across the upper and lower parts of the body portion 16 .
The lower end of the inclined rib 21 is located above the maximum outer diameter portion of the double container 1. The lower end of the inclined rib 21 is located below the vertical rib 22. The upper end of the inclined rib 21 is located at the upper end of the body 16. The radial size at the lower end of the inclined rib 21 decreases as it goes downward along the first direction. The radial size at the upper end of the inclined rib 21 decreases as it goes upward along the first direction.

The inclined rib 21 is divided into vertical ribs 22 .
The divided portion of the inclined rib 21 divided by the vertical rib 22 is separated in the first direction from the vertical rib 22. The radial size of the divided portion of the inclined rib 21 becomes smaller as it approaches the first direction relative to the vertical rib 22 dividing the inclined rib 21.
In the inclined rib 21, each divided portion that sandwiches the vertical rib 22 in the first direction may be located on the same line extending in the first direction when viewed from the radial outside, or may be positioned offset from the same line extending in the first direction.

As described above, according to the double container 1 of this embodiment, the body of each of the outer container 11 and the inner container 12 has a plurality of inclined ribs 21 extending in a first direction inclined in the direction of the bottle axis O and the circumferential direction when viewed from the outside in the radial direction, and the inclined ribs 21 are spaced apart in a second direction perpendicular to the first direction. Therefore, when the body 16 is elastically deformed toward the inside in the radial direction, the inclined ribs 21 widen, making it easier to stretch the body 16 in the second direction. Therefore, during this elastic deformation, it is possible to suppress the occurrence of wrinkles in the outer container 11 and the inner container 12, and it is easy to generate a starting point of peeling between the inner surface of the outer container 11 and the outer surface of the inner container 12, and it is possible to suppress the inner container 12 from becoming one with the deformation of the outer container 11 in a predetermined area of the body 16 pressed toward the inside in the radial direction. This makes it possible to prevent the inner surface of the outer container 11 and the outer surface of the inner container 12 from rubbing against each other when the body 16 is elastically deformed radially inward, thereby preventing the generation of squeaking noises.

The inclined ribs 21 are provided in the pressed portion of the body 16, which is located between adjacent vertical ribs 22 in the circumferential direction and is pressed radially inward, thereby ensuring the above-mentioned effects.

The diameter of the upper part of the body 16 is smaller than the diameter of the lower part of the body 16, which improves ground contact stability. Even if the upper part of the body 16, which has a higher rigidity than the lower part, is pressed radially inward, the inclined rib 21 can be widened to make it easier to stretch the upper part of the body 16 in the second direction, effectively suppressing the occurrence of creaking noises and wrinkles.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the body 16 may have a configuration in which a plurality of surfaces are connected in the circumferential direction via corners, and the vertical ribs 22 may be provided at the corners.
In this case, vertical ribs 22 are provided at the corners of the body 16, which have high rigidity, thereby further increasing the rigidity of the corners. Therefore, when the body 16 is elastically deformed radially inward, the portions of the body 16 located between adjacent vertical ribs 22 in the circumferential direction are reliably pressed.
The body portion 16 may extend straight in the direction of the bottle axis O, for example.

In addition, the components in the above embodiment may be replaced with known components as appropriate without departing from the spirit of the present invention, and the above embodiment and the above modified examples may be combined as appropriate.

Reference Signs List 1 Double container 11 Outer container 12 Inner container 13 Mouth 14 Bottom 16 Body 17 Outside air introduction hole 21 Inclined rib 22 Vertical rib O Bottle axis

Claims (1)

The bottle has an inner container that is deformed in volume as the amount of content contained therein decreases, and an outer container in which the inner container is housed, and the bottle has a mouth, a body, and a bottom that are arranged in this order from top to bottom along the bottle axial direction,
an outside air introduction hole for introducing outside air between the outer container and the inner container as the content decreases;
At least a body portion of the outer container is formed to be elastically deformable,
A plurality of inclined ribs extending in a first direction inclined in the bottle axial direction and the circumferential direction as viewed from the outside in the radial direction are provided on each body portion of the outer container and the inner container at intervals in a second direction perpendicular to the first direction as viewed from the outside in the radial direction,
The diameter of the upper part of the body on the mouth side is smaller than the diameter of the lower part of the body on the bottom side,
The inclined rib is formed across the upper and lower parts of the body portion,
The body portion extends radially outward from the top to the bottom,
The upper part of the body has a curved shape recessed radially inward when viewed in a vertical cross section along the bottle axis,
A plurality of vertical ribs extending in the bottle axial direction are formed on the body portion at intervals in the circumferential direction,
A double container , wherein the inclined rib is separated by the longitudinal rib .

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