JP7499676B2 - 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 elastically deformable outer container in which the inner container is placed, and in which the mouth, shoulder, 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 2019-131256 A

However, with the conventional double-walled containers, there was room for improvement in terms of allowing the inner container to be smoothly separated from the outer container at the shoulder and body.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a double container that allows the inner container to be smoothly peeled away from the outer container at the shoulder and body.

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 elastically deformable outer container in which the inner container is housed, and the mouth, shoulder, body, and bottom are arranged in this order from top to bottom along the bottle axis direction, an outside air introduction hole is provided for introducing outside air between the outer container and the inner container as the contents decrease, an upper gap is provided between the outer container and the inner container at the connection part of the mouth with the shoulder, the body is configured with a plurality of surfaces connected in the circumferential direction via corners, a first vertical convex rib is formed at the corners that extends in the bottle axis direction when viewed from the outside in the radial direction, and the first vertical convex rib is integrally formed from the connection part of the mouth with the shoulder through the shoulder to the center part of the body in the bottle axis direction.

In the present invention, since a first vertical convex rib is formed, it becomes possible to provide a tiny gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container during blow molding, and as the contents decrease, outside air from the outside air inlet hole can enter the tiny gap, causing the inner container to peel off from the outer container and undergo volume reduction deformation, starting from the tiny gap.
Since the first vertical convex rib is integrally formed from the connection portion with the shoulder portion at the mouth (hereinafter referred to as the lower end portion) through the shoulder portion to the central portion in the bottle axial direction of the body portion (hereinafter referred to as the pressed portion), when the radially inward pressure on the pressed portion is released, the portion of the aforementioned tiny gap located at the pressed portion can be allowed to progress along the first vertical convex rib, and the peeling of the inner container from the outer container can be reliably propagated from the pressed portion to the shoulder portion.
Since the upper end of the first vertical convex rib is located at the lower end of the mouth, the tiny gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container can be connected to an upper gap provided between the lower end of the mouth of the outer container and the lower end of the mouth of the inner container.
As a result, it is possible to smoothly peel the inner container from the outer container at the shoulder and body, thereby reducing the amount of remaining contents.
The vertical rib extending downward from the lower end of the mouth, which enables a small gap to be created between the outer container and the inner container, is convex rather than concave, so that the small gap between the outer container and the inner container can be connected to the upper gap without narrowing the upper gap mentioned above, ensuring smooth peeling of the inner container from the outer container at the shoulder and body.
Since the first vertical convex rib is formed on a corner portion with high rigidity rather than on a flexible surface portion, by forming the first vertical convex rib on the body portion, it is possible to prevent the body portion of the inner container from being easily deformed by reducing in volume and to prevent the surface portion of the pressed portion of the outer container from losing flexibility.

The first vertical convex ribs may be formed separately at each of the corners, and vertical grooves extending in the bottle axial direction as viewed from the outside in the radial direction may be formed in the shoulder portion between adjacent first vertical convex ribs in the circumferential direction.

In this case, a vertical groove extending in the bottle axial direction when viewed from the outside in the radial direction is formed in the shoulder portion between the first vertical convex ribs adjacent to each other in the circumferential direction. This ensures that a minute gap is created between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container during blow molding, and also makes it easier to peel the shoulder of the inner container from the shoulder of the outer container starting from the gap between the vertical groove of the outer container and the vertical groove of the inner container as the contents decrease.

The first vertical convex ribs are formed separately at each of the multiple corners, and a second vertical convex rib is formed between adjacent first vertical convex ribs in the circumferential direction, extending in the bottle axial direction when viewed from the outside in the radial direction, and the second vertical convex rib is formed integrally with the shoulder and body, and may be located above the lower end of the first vertical convex rib.

In this case, since second vertical convex ribs are formed between first vertical convex ribs adjacent to each other in the circumferential direction, it becomes possible to provide slight gaps between the second vertical convex ribs of the outer container and the second vertical convex ribs of the inner container during blow molding, and multiple slight gaps can be provided between the outer container and the inner container over the entire circumferential length at the shoulder and body portions.
Since the second vertical convex rib is located above the lower end of the first vertical convex rib, the provision of the second vertical convex rib can prevent the rigidity of the pressed portion of the body from becoming too high.

The first vertical convex ribs are formed separately at each of the corners, and vertical grooves extending in the bottle axial direction as viewed from the outside in the radial direction are formed in the shoulder portion between the first vertical convex ribs adjacent to each other in the circumferential direction, and second vertical convex ribs extending in the bottle axial direction as viewed from the outside in the radial direction are formed between the first vertical convex ribs adjacent to each other in the circumferential direction, and the second vertical convex ribs are formed integrally with the shoulder portion and the body portion and are located above the lower ends of the first vertical convex ribs, and the vertical grooves and the second vertical convex ribs may be arranged alternately in the circumferential direction.

In this case, the vertical grooves and the second vertical convex ribs are alternately provided in the circumferential direction between the first vertical convex ribs that are adjacent to each other in the circumferential direction, so that a small gap can be reliably provided between the second vertical convex rib of the outer container and the second vertical convex rib of the inner container during blow molding.

The longitudinal groove may be provided between the first longitudinal convex rib and the second longitudinal convex rib that are adjacent to each other in the circumferential direction.

In this case, since the vertical groove is provided between the first vertical convex rib and the second vertical convex rib that are adjacent to each other in the circumferential direction, it is possible to reliably provide a minute gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container, and a small gap between the second vertical convex rib of the outer container and the second vertical convex rib of the inner container during blow molding, making it easier to reduce the volume of the inner container evenly and with little bias over the entire circumferential length, at least in the shoulder portion.

The outside air introduction hole may be located above the shoulder.

In this case, since the outside air inlet is located above the shoulder, as the contents decrease, outside air from the outside air inlet smoothly passes through the upper gap between the lower end of the mouth of the outer container and the lower end of the mouth of the inner container, and the minute gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container, in that order, thereby ensuring the volume reduction deformation of the shoulder and body of the inner container.

This invention allows the inner container to be peeled away from the outer container smoothly at the shoulder and body.

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. FIG. 2 is a top view of FIG. 1 .

Hereinafter, a double container according to one embodiment will be described with reference to the drawings.
1, the double container 1 according to this embodiment includes an inner container 12 that undergoes volume reduction deformation as the contained contents decrease, and an elastically deformable 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 illustrated example, 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 of the outer container 11.
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 in this order coaxially with a common axis.
Hereinafter, this common axis will be referred to as the bottle axis O, the side of the mouth 13 of the double container 1 along the bottle axis O will be referred to as the upper side, and the side of the bottom 14 of the double container 1 will be referred to as the lower side. When viewed from the direction of the bottle axis O, 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 direction of the bottle axis O 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 direction of the bottle axis O is approximately 150 mm, and the double container 1 is for a capacity of 200 ml.

The mouth 13 of the double container 1 is formed in a cylindrical shape extending upward from the upper end of the shoulder portion 15 .
A flange portion that protrudes radially outward and extends continuously over the entire circumferential length is formed at the upper end of the mouth of the inner container 12. The flange portion 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 locking protrusion 18 to which a cap (not shown) is locked, a sealed protrusion 19 to which the peripheral wall portion of the cap (not shown) is fitted, and a neck ring 20.
The locking projection 18, 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 projection 19 and the inner peripheral surface of the peripheral wall of the cap (not shown). The outer diameter of the neck ring 20 is larger than the outer diameter of the sealed projection 19.
The cap may be screwed onto the mouth of the outer container 11. The neck ring 20 does not need to be provided.

An outside air introduction hole 17 for introducing outside air between the inner container 12 as the contents decrease is provided above the shoulder portion 15. In the illustrated example, the outside air introduction hole 17 is formed in the mouth of the outer container 11. 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 of the mouth of the inner container 12, etc.

The shoulder portion 15 extends radially outward from the lower end of the mouth portion 13 downward.
The upper part of the body 16 extends almost straight in the direction of the bottle axis O. The lower part of the body 16 extends radially outward as it extends downward, and when viewed from the radially outward, presents a curved shape that is recessed radially inward. The lower end 16a of the body 16 extends straight in the direction of the bottle axis O. The outer peripheral surface of the lower end 16a of the body 16 forms the maximum outer diameter part of the double container 1. The outer diameter of this maximum outer diameter part is, for example, 58 mm or more and 74 mm or less. In the illustrated example, the outer diameter of the maximum outer diameter part of the double container 1 is about 62 mm.
The bottom 14 is formed in a bottomed cylindrical shape. The peripheral wall 14b of the bottom 14 extends radially inward as it extends downward. The bottom 14 has a circular shape over its entire length in the bottle axis O direction when viewed in a cross section perpendicular to the bottle axis O.

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.

As shown in Figs. 1 and 2, the body 16 and shoulder 15 are configured by connecting a plurality of surfaces 31 in the circumferential direction via corners 32. In the illustrated example, the body 16 and shoulder 15 have a regular hexagonal shape in the cross section. Note that the shoulder 15 may have, for example, a circular or elliptical shape in the cross section.

The surface portion 31 has a curved shape that protrudes radially outward in a cross section perpendicular to the bottle axis O. The surface portion 31 may have a straight shape in the cross section.
When viewed from the outside in the radial direction, the corner portion 32 is formed in a ridge shape extending in the direction of the bottle axis O. In addition, when viewed from the outside in the radial direction, the corner portion 32 may be formed in a band shape having a circumferential width and extending in the direction of the bottle axis O.

A first vertical convex rib 33 is formed at the corner 32 and extends in the direction of the bottle axis O when viewed from the outside in the radial direction.

The first vertical convex rib 33 is formed separately at each of the multiple corners 32. The first vertical convex rib 33 extends straight in the bottle axis O direction when viewed from the outside in the radial direction. The width of the first vertical convex rib 33 is wider than the width of the corners 32. The first vertical convex rib 33 is integrally formed from the connection portion (hereinafter referred to as the lower end) 13a with the shoulder portion 15 of the mouth portion 13, through the shoulder portion 15, and to the center of the body portion 16 in the bottle axis O direction. In other words, the upper end of the first vertical convex rib 33 is located at the lower end 13a of the mouth portion 13, and the lower end of the first vertical convex rib 33 is located at the center of the body portion 16 in the bottle axis O direction.

Here, the lower end 13a of the mouth portion 13 is located below the neck ring 20 and is the boundary portion that stretches during blow molding. At the lower end 13a of the mouth portion 13, an upper gap is provided between the outer container 11 and the inner container 12. The upper gap is provided intermittently over the entire circumferential length. This upper gap is also provided in a state in which the inner preform for forming the inner container 12 is fitted into the outer preform for forming the outer container 11 before the double container 1 becomes a biaxially stretched blow container. In addition, a configuration in which multiple vertical ribs are formed at intervals in the circumferential direction on the outer peripheral surface of the upper part of the inner preform, and the upper gap is provided intermittently over the entire circumferential length by the multiple vertical ribs may be adopted. The upper gap may extend continuously over the entire circumferential length.

The protruding height of the portion of the first vertical convex rib 33 located between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the protruding height of both ends in the bottle axis O direction decreases toward the outside in the bottle axis O direction. The width of the portion of the first vertical convex rib 33 located between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the width of both ends in the bottle axis O direction decreases toward the outside in the bottle axis O direction. The first vertical convex rib 33 has a convex curved shape when viewed in cross section.

In the shoulder portion 15, a vertical groove 34 is formed in the portion located between adjacent first vertical protruding ribs 33 in the circumferential direction, and extends in the direction of the bottle axis O when viewed from the outside in the radial direction.

The vertical groove 34 extends straight in the direction of the bottle axis O when viewed from the outside in the radial direction. The upper end of the vertical groove 34 is located below the lower end 13a of the mouth portion 13. The vertical groove 34 is integrally formed from the upper end of the shoulder portion 15 to the upper end of the body portion 16. The vertical groove 34 may be formed only in the shoulder portion 15. The width of the vertical groove 34 is wider than the width of the first vertical convex rib 33. The width of the vertical groove 34 may be less than the width of the first vertical convex rib 33.

The depth of the vertical groove 34 between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the depth of both ends in the bottle axis O direction becomes shallower toward the outside in the bottle axis O direction. The width of the vertical groove 34 between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the width of both ends in the bottle axis O direction becomes narrower toward the outside in the bottle axis O direction. A plurality of vertical grooves 34 are formed at intervals in the circumferential direction on the surface portion 31. One vertical groove 34 is formed in the circumferential center of the surface portion 31. The inner surface of the vertical groove 34 has a concave curved shape when viewed in cross section.

Between the first vertical convex ribs 33 adjacent to each other in the circumferential direction, a second vertical convex rib 35 is formed, which extends in the direction of the bottle axis O when viewed from the outside in the radial direction.

The second vertical convex rib 35 extends straight in the direction of the bottle axis O when viewed from the outside in the radial direction. The second vertical convex rib 35 is formed integrally with the shoulder portion 15 and the body portion 16. The length of the second vertical convex rib 35 is shorter than the length of the first vertical convex rib 33. The lower end of the second vertical convex rib 35 is located below the lower end of the vertical groove 34 and above the lower end of the first vertical convex rib 33. The upper ends of the second vertical convex rib 35 and the first vertical convex rib 33 are located at the same vertical position.

When viewed from the outside in the radial direction, the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the first vertical convex rib 33 is equal to the size of the second vertical convex rib 35 in the bottle axis O direction. In addition, when viewed from the outside in the radial direction, the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the first vertical convex rib 33 may be made different from the size of the second vertical convex rib 35 in the bottle axis O direction.

When viewed from the outside in the radial direction, the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the first vertical convex rib 33 is greater than the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the vertical groove 34. In addition, when viewed from the outside in the radial direction, the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the first vertical convex rib 33 may be less than the distance in the bottle axis O direction between the lower end of the second vertical convex rib 35 and the lower end of the vertical groove 34.

The protruding height of the second vertical convex rib 35 is equal to the protruding height of the first vertical convex rib 33. The protruding heights of the second vertical convex rib 35 and the first vertical convex rib 33 may be different from each other. The width of the second vertical convex rib 35 is narrower than the width of the first vertical convex rib 33. The width of the second vertical convex rib 35 may be greater than or equal to the width of the first vertical convex rib 33.

The protruding height of the portion of the second vertical convex rib 35 located between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the protruding height of both ends in the bottle axis O direction decreases toward the outside in the bottle axis O direction. The width of the portion of the second vertical convex rib 35 located between both ends in the bottle axis O direction is uniform over the entire length in the bottle axis O direction, and the width of both ends in the bottle axis O direction decreases toward the outside in the bottle axis O direction. The second vertical convex rib 35 has a convex curved shape when viewed in cross section.

The vertical grooves 34 and the second vertical convex ribs 35 are alternately provided in the circumferential direction on the surface portion 31. The vertical grooves 34 are provided between the first vertical convex rib 33 and the second vertical convex rib 35 that are adjacent to each other in the circumferential direction. The first vertical convex rib 33, the vertical grooves 34 and the second vertical convex rib 35 are provided in a row in the circumferential direction.
The first vertical convex rib 33 and the second vertical convex rib 35 may be adjacent to each other in the circumferential direction without the vertical groove 34. The first vertical convex rib 33, the vertical groove 34, and the second vertical convex rib 35 may be provided at intervals in the circumferential direction.

As described above, according to the double container 1 of this embodiment, the first vertical convex rib 33 is formed, so that during blow molding, a minute gap can be provided between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12. As the contents decrease, outside air can be allowed to enter the minute gap from the outside air inlet 17, and the inner container 12 can be peeled off from the outer container 11 starting from the minute gap, causing a volume reduction deformation.

The first vertical convex rib 33 is integrally formed from the lower end 13a of the mouth 13 through the shoulder 15 to the center of the body 16 in the direction of the bottle axis O (hereinafter referred to as the pressed portion). When the radially inward pressure on the pressed portion is released, the portion of the minute gap described above that is located in the pressed portion can progress along the first vertical convex rib 33, and the peeling of the inner container 12 from the outer container 11 can be reliably propagated from the pressed portion to the shoulder 15.

Since the upper end of the first vertical convex rib 33 is located at the lower end 13a of the mouth 13, the minute gap between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12 can be connected to the upper gap provided between the lower end of the mouth of the outer container 11 and the lower end of the mouth of the inner container 12.

As a result, it is possible to smoothly separate the inner container 12 from the outer container 11 at the shoulder 15 and body 16, thereby reducing the amount of remaining contents.

The vertical ribs extending downward from the lower end 13a of the mouth 13, which allow for a small gap between the outer container 11 and the inner container 12, are convex rather than concave, making it possible to connect the small gap between the outer container 11 and the inner container 12 to the upper gap without narrowing the upper gap described above, ensuring smooth peeling of the inner container 12 from the outer container 11 at the shoulder 15 and body 16.

The first vertical convex rib 33 is formed on the highly rigid corner 32, not on the flexible surface 31. By forming the first vertical convex rib 33 on the body 16, it is possible to prevent the body of the inner container 12 from being easily deformed by volume reduction, and to prevent the surface of the pressed portion of the outer container 11 from losing flexibility.

In the shoulder portion 15, a vertical groove 34 is formed in the portion located between adjacent first vertical convex ribs 33 in the circumferential direction, extending in the direction of the bottle axis O when viewed from the outside in the radial direction. This ensures that a minute gap is created between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12 during blow molding, and also makes it easier to peel the shoulder of the inner container 12 from the shoulder of the outer container 11 starting from the area between the vertical groove of the outer container 11 and the vertical groove of the inner container 12 as the contents decrease.

Since the second vertical convex ribs 35 are formed between the first vertical convex ribs 33 that are adjacent to each other in the circumferential direction, it is possible to provide slight gaps between the second vertical convex ribs of the outer container 11 and the second vertical convex ribs of the inner container 12 during blow molding, and a large number of slight gaps can be provided between the outer container 11 and the inner container 12 at the shoulder portion 15 and the body portion 16 along the entire circumferential length.
Since the second vertical convex rib 35 is located above the lower end of the first vertical convex rib 33, the provision of the second vertical convex rib 35 can prevent the rigidity of the pressed portion of the body 16 from becoming too high.

Because the vertical grooves 34 and the second vertical convex ribs 35 are alternately provided between the first vertical convex ribs 33 that are adjacent to each other in the circumferential direction, it is possible to reliably provide a small gap between the second vertical convex rib of the outer container 11 and the second vertical convex rib of the inner container 12 during blow molding.

Because the vertical grooves are provided between the first vertical convex rib and the second vertical convex rib that are adjacent to each other in the circumferential direction, it is possible to reliably provide a minute gap between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12 during blow molding, and a small gap between the second vertical convex rib of the outer container 11 and the second vertical convex rib of the inner container 12, making it easier to reduce the volume of the inner container 12 evenly and with little bias over the entire circumferential length, at least in the shoulder portion 15.

The outside air inlet 17 is located above the shoulder 15, so that as the contents decrease, the outside air from the outside air inlet 17 smoothly passes through the upper gap between the lower end of the mouth of the outer container 11 and the lower end of the mouth of the inner container 12, and the minute gap between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12, in that order, thereby ensuring the volume reduction and deformation of the shoulder and body of the inner container 12.

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.

The first vertical convex rib 33 may be formed on some of the multiple corners 32 , or may be formed on only one corner 32 , for example.
The first vertical convex rib 33, the vertical groove 34 and the second vertical convex rib 35 may extend in the direction of the bottle axis O while bending when viewed from the radial outside.
The second vertical convex rib 35 and the vertical groove 34 do not have to be formed on the surface portion 31 .
The body 16 may extend straight in the bottle axis O direction over its entire length in the bottle axis O direction.

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.

1 Double container 11 Outer container 12 Inner container 13 Mouth 13a Lower end (connection part)
14 Bottom 15 Shoulder 16 Body 17 Outside air introduction hole 31 Face 32 Corner 33 First vertical convex rib 34 Vertical groove 35 Second vertical convex rib O Bottle axis

Claims (6)

The bottle has an inner container that is deformed to reduce its volume as the amount of content contained therein decreases, and an outer container that is elastically deformable and has the inner container housed therein, and the mouth, shoulder, body, and bottom 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 contents decrease;
an upper gap is provided between the outer container and the inner container at a connection portion of the mouth portion and the shoulder portion;
The body portion is configured by connecting a plurality of surface portions in a circumferential direction via corner portions,
A first vertical convex rib is formed at the corner portion and extends in the bottle axial direction when viewed from the outside in the radial direction,
A double container, wherein the first vertical convex rib is integrally formed from the connection portion of the mouth with the shoulder portion, through the shoulder portion, and over the central portion of the body portion in the bottle axial direction. The first vertical protruding rib is formed separately at each of the plurality of corner portions,
The double container according to claim 1, wherein a vertical groove extending in the bottle axial direction when viewed from the radial outside is formed in the shoulder portion in a portion located between adjacent first vertical convex ribs in the circumferential direction. The first vertical protruding rib is formed separately at each of the plurality of corner portions,
A second vertical convex rib is formed between the first vertical convex ribs adjacent to each other in the circumferential direction, the second vertical convex rib extending in the bottle axial direction when viewed from the outside in the radial direction,
3. The double container according to claim 1, wherein the second vertical convex rib is integrally formed with the shoulder portion and the body portion and is located above a lower end of the first vertical convex rib. The first vertical protruding rib is formed separately at each of the plurality of corner portions,
In the shoulder portion, a vertical groove extending in the bottle axial direction when viewed from the outside in the radial direction is formed in a portion located between the first vertical protruding ribs adjacent to each other in the circumferential direction,
A second vertical convex rib is formed between the first vertical convex ribs adjacent to each other in the circumferential direction, the second vertical convex rib extending in the bottle axial direction when viewed from the outside in the radial direction,
The second vertical convex rib is integrally formed with the shoulder portion and the body portion, and is located above a lower end portion of the first vertical convex rib,
The double container according to claim 1 , wherein the longitudinal grooves and the second longitudinal protruding ribs are alternately provided in the circumferential direction. The double container according to claim 4, wherein the vertical groove is provided between the first vertical convex rib and the second vertical convex rib that are adjacent to each other in the circumferential direction. The double container according to any one of claims 1 to 5, wherein the outside air inlet is provided above the shoulder.

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