JP2022071550A - Double container - Google Patents

Abstract

To provide a double container allowing smooth peeling of an inner container to an outer container at a shoulder and a body.SOLUTION: A double container has: an inner container 12 performing volume-reducing deformation following reduction of a stored content; and an elastically deformable outer container 11 having the inner container provided therein. A mouth 13, a shoulder 15, a body 16 and a bottom 14 are arranged from an upper part to a lower part in this order along a bottle axis O direction. The double container has an outside air introduction hole 17 for introducing the outside air between the outer container and the inner container, with the reduction of the content. An upper gap is provided between the outer container and the inner container at a connection part with the shoulder at the mouth. The body is composed of multiple face parts 31 continued in a circumferential direction, via corner parts 32. First vertically protruded ribs 33 extending in the bottle axis direction when viewed from radial outside are formed. The first vertically protruded ribs are integrally formed from a connection part 13a with the shoulder at the mouth over a center part in the bottle axis direction at the body, via the shoulder.SELECTED DRAWING: Figure 1

Description

The present invention relates to a double container.

Conventionally, for example, as shown in Patent Document 1 below, an inner container whose volume is reduced and deformed as the contents to be accommodated decreases, and an elastically deformable outer container in which the inner container is incorporated are provided, and the mouth portion. The shoulder, body, and bottom are arranged in this order from top to bottom along the bottle axis direction, and as the contents decrease, outside air is introduced between the outer container and the inner container. Double containers with holes are known.

Japanese Unexamined Patent Publication No. 2019-131256

However, in the conventional double container, there is room for improvement in smoothly advancing the peeling of the inner container from the outer container at the shoulder and the body.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a double container capable of smoothly advancing peeling of an inner container from an outer container at a shoulder portion and a body portion.

The present invention employs the following means to solve the above problems. That is, the double container of the present invention includes an inner container whose volume is reduced and deformed as the contents to be accommodated decrease, and an elastically deformable outer container in which the inner container is contained, as well as a mouth portion, a shoulder portion, and the like. The body and bottom are arranged in this order from top to bottom along the bottle axis direction, and as the contents decrease, an outside air introduction hole for introducing outside air between the outer container and the inner container. An upper gap is provided between the outer container and the inner container at the connection portion of the mouth portion with the shoulder portion, and the body portion has a plurality of surface portions in the circumferential direction via the corner portions. A first longitudinal convex rib extending in the direction of the bottle axis when viewed from the outside in the radial direction is formed at the corner portion, and the first longitudinal convex rib is formed with the shoulder portion in the mouth portion. It is integrally formed from the connecting portion through the shoulder portion to the central portion of the body portion in the bottle axial direction.

In the present invention, since the first vertical convex rib is formed, it is possible to provide a minute gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container at the time of blow molding. As the contents decrease, the outside air from the outside air introduction hole is allowed to enter the minute gap, so that the inner container can be separated from the outer container and deformed while reducing the volume, starting from the minute gap.
The first vertically convex rib is integrally formed from the connection portion with the shoulder portion in the mouth portion (hereinafter referred to as the lower end portion) to the central portion in the body portion in the bottle axial direction (hereinafter referred to as the pressed portion) via the shoulder portion. Therefore, when the pressure on the pressed portion toward the inside in the radial direction is released, the portion of the above-mentioned minute gaps located in the pressed portion is extended along the first vertically convex rib. 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, a minute gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container is formed in the outer container. It is possible to communicate with the upper gap provided between the lower end of the mouth portion of the container and the lower end portion of the mouth portion of the inner container.
From the above, it becomes possible to smoothly proceed with the peeling of the inner container from the outer container on the shoulder and the body, and it is possible to reduce the remaining amount of the contents.
Since the vertical rib extending downward from the lower end of the mouth, which can provide a minute gap between the outer container and the inner container, is convex instead of concave, narrow the above-mentioned upper gap. Instead, a minute gap between the outer container and the inner container can be communicated with the upper gap, and the inner container can be surely and smoothly peeled off from the outer container at the shoulder and the body.
Since the first vertically convex rib is formed not on the flexible surface portion but on the corner portion having high rigidity, the body portion of the inner container is reduced in volume and deformed by forming the first vertically convex rib on the body portion. It can be suppressed that it becomes difficult to do so and that the flexibility of the surface portion of the pressed portion of the outer container is lost.

The first vertically convex ribs are separately formed at the plurality of corner portions, and are located between the first vertically convex ribs adjacent to each other in the circumferential direction on the shoulder portion from the outside in the radial direction. A vertical groove extending in the axial direction of the bottle may be formed.

In this case, in the shoulder portion, a vertical groove extending in the bottle axis direction when viewed from the outside in the radial direction is formed in a portion located between the first vertically convex ribs adjacent to each other in the circumferential direction, so that blow molding is performed. Occasionally, a minute gap can be reliably provided between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container, and as the contents decrease, the vertical groove of the outer container and the inner container The shoulder portion of the inner container can be easily peeled off from the shoulder portion of the outer container, starting from the space between the vertical groove and the vertical groove of the inner container.

The first vertically convex ribs are formed separately at each of the plurality of corner portions, and between the first vertically convex ribs adjacent to each other in the circumferential direction, a second extending in the bottle axial direction when viewed from the outside in the radial direction. A vertically convex rib is formed, and the second vertically convex rib may be integrally formed on the shoulder portion and the body portion, and may be located above the lower end portion of the first vertically convex rib.

In this case, since the 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 of the outer container and the second vertical convex rib of the inner container are formed at the time of blow molding. It is possible to provide a slight gap between the convex rib and the shoulder portion and the body portion, and a large number of slight gaps can be provided between the outer container and the inner container over the entire length in the circumferential direction.
Since the second vertically convex rib is located above the lower end of the first vertically convex rib, the provision of the second vertically convex rib suppresses the rigidity of the pressed portion of the body portion from increasing. be able to.

The first vertically convex ribs are separately formed at the plurality of corner portions, and are located between the first vertically convex ribs adjacent to each other in the circumferential direction on the shoulder portion from the outside in the radial direction. A vertical groove extending in the bottle axis direction is formed, and a second vertically convex rib extending in the bottle axis direction when viewed from the outside in the radial direction is formed between the first vertically convex ribs adjacent to each other in the circumferential direction. The second vertically convex rib is integrally formed on the shoulder portion and the body portion, and is located above the lower end portion of the first vertically convex rib, and the vertical groove and the second vertically convex rib are formed. , May be provided alternately in the circumferential direction.

In this case, since the vertical grooves and the second vertical convex ribs are alternately provided in the circumferential direction between the first vertical convex ribs adjacent to each other in the circumferential direction, the second vertical vertical of the outer container is provided at the time of blow molding. A slight gap can be reliably provided between the convex rib and the second vertical convex rib of the inner container.

The vertical groove may be provided between the first vertically convex rib and the second vertically convex rib 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 adjacent to each other in the circumferential direction, the first vertical convex rib of the outer container and the inner container are provided during blow molding. It is possible to surely provide a minute gap between the first vertical convex rib and a small gap between the second vertical convex rib of the outer container and the second vertical convex rib of the inner container, and at least. At the shoulder portion, the inner container can be easily reduced in volume and deformed evenly with little bias over the entire length in the circumferential direction.

The outside air introduction hole may be provided above the shoulder portion.

In this case, since the outside air introduction hole is provided above the shoulder portion, as the contents decrease, the outside air from the outside air introduction hole flows into the lower end portion of the mouth portion of the outer container and the mouth portion of the inner container. The upper gap provided between the lower end and the minute gap between the first vertical convex rib of the outer container and the first vertical convex rib of the inner container will smoothly pass in this order, and the inner container will pass smoothly. The shoulders and torso of the body can be reliably reduced in volume and deformed.

According to the present invention, the peeling of the inner container from the outer container can proceed smoothly on the shoulder and the body.

It is a side view which includes a part vertical cross-section which looked at the double container shown as one Embodiment from the outside in the radial direction. It is a top view of FIG.

Hereinafter, the double container according to the embodiment will be described with reference to the drawings.
As shown in FIG. 1, the double container 1 according to the present embodiment has an inner container 12 whose volume is reduced and deformed as the contents to be accommodated decrease, and an elastically deformable outer container in which the inner container 12 is incorporated. 11 is provided. The outer surface of the inner container 12 is provided on the inner surface of the outer container 11 so as to be separable. In the illustrated example, the inner container 12 is highly flexible and is releasably laminated on the inner surface of the outer container 11.
A gap may be provided between the inner surface of the outer container 11 and the outer surface of the inner container 12.

In the double container 1, the outer preform and the inner preform are integrally blow-molded in a state where the inner preform for forming the inner container 12 is fitted in the outer preform for forming the outer container 11. It is formed by doing. That is, the double container 1 is a biaxially stretched blow container.

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

The double container 1 includes a mouth portion 13, a shoulder portion 15, a body portion 16 and a bottom portion 14. The mouth portion 13, the shoulder portion 15, the body portion 16, and the bottom portion 14 are arranged in this order coaxially with the common axis.
Hereinafter, this common shaft is referred to as a bottle shaft O, the mouth 13 side of the double container 1 along the bottle shaft O is referred to as an upper side, and the bottom 14 side of the double container 1 is referred to as a lower side. The direction that intersects the bottle axis O when viewed from the bottle axis O direction is called the radial direction, and the direction that orbits around the bottle axis O is called the circumferential direction.

The mouth portion 13 of the double container 1 is configured by laminating the mouth portion of the inner container 12 and the mouth portion of the outer container 11, and the shoulder portion 15 of the double container 1 is formed with the shoulder portion of the inner container 12. The shoulder portion of the outer container 11 is laminated, and the body portion 16 of the double container 1 is configured by laminating the body portion of the inner container 12 and the body portion of the outer container 11. The bottom 14 of the heavy container 1 is formed by laminating the bottom of the inner container 12 and the bottom of the outer container 11.
In the following description, unless otherwise specified, both the inner container 12 and the outer container 11 are assumed to have the same form.

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 content 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 has an internal capacity of 200 ml.

The mouth portion 13 of the double container 1 is formed in a cylindrical shape extending upward from the upper end portion of the shoulder portion 15.
A flange portion is formed at the upper end of the mouth portion of the inner container 12 so as to project outward in the radial direction and continuously extend over the entire length in the circumferential direction. The flange portion is placed on the upper end opening edge of the mouth portion of the outer container 11.

A locking protrusion 18 to which a cap (not shown) is locked, a sealed protrusion 19 to which a peripheral wall portion of the cap (not shown) is externally fitted, and a neck ring 20 are provided on the outer peripheral surface of the mouth portion of the outer container 11. It is formed in this order from the top to the bottom.
The locking protrusion 18, the sealed protrusion 19, and the neck ring 20 project radially outward from the mouth of the outer container 11 and extend continuously over the entire length in the circumferential direction. The outer peripheral surface of the protrusion 19 to be sealed and the inner peripheral surface of the peripheral wall portion of the cap (not shown) are hermetically sealed. The outer diameter of the neck ring 20 is larger than the outer diameter of the projected portion 19 to be sealed.
The cap may be screwed to the mouth of the outer container 11. The neck ring 20 may not be provided.

As the contents decrease, an outside air introduction hole 17 for introducing outside air between the inner container 12 and the inner container 12 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 on the outermost side in the radial direction of the protrusions 19 to be sealed, and is located above the sealing surface that continuously extends over the entire length in the circumferential direction.
The position of forming the outside air introduction hole 17 is not limited to the mouth portion of the outer container 11, and may be, for example, the body portion, shoulder portion, or bottom portion of the outer container 11 other than the mouth portion. Further, it may be between the upper end opening edge of the mouth portion of the outer container 11 and the lower surface of the flange portion of the mouth portion of the inner container 12.

The shoulder portion 15 extends radially outward from the lower end portion of the mouth portion 13 downward.
The upper portion of the body portion 16 extends substantially straight in the bottle axis O direction. The lower portion of the body portion 16 extends outward in the radial direction as it goes downward, and exhibits a curved shape that is recessed inward in the radial direction when viewed from the outside in the radial direction. The lower end portion 16a of the body portion 16 extends straight in the bottle axis O direction. The outer peripheral surface of the lower end portion 16a of the body portion 16 is the maximum outer diameter portion having the largest outer diameter in 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 62 mm.
The bottom portion 14 is formed in the shape of a bottomed cylinder. The peripheral wall portion 14b of the bottom portion 14 extends radially inward toward the bottom. The bottom portion 14 exhibits a circular shape in a cross-sectional view orthogonal to the bottle axis O over the entire length in the bottle axis O direction.

At least the body of the outer container 11 can be squeeze-deformed (elastically deformed), and the inner container 12 is deflated and deformed as the outer container 11 is squeeze-deformed. The body portion 16, the shoulder portion 15, and the bottom portion 14 are connected to each other in the bottle axis O direction without a step.

As shown in FIGS. 1 and 2, the body portion 16 and the shoulder portion 15 are configured such that a plurality of surface portions 31 are connected in the circumferential direction via the corner portions 32. In the illustrated example, the body portion 16 and the shoulder portion 15 have a regular hexagonal shape in the cross-sectional view. The shoulder portion 15 may have a circular shape, an elliptical shape, or the like in the cross-sectional view.

The surface portion 31 exhibits a protruding curved shape toward the outside in the radial direction in a cross-sectional view orthogonal to the bottle axis O. The surface portion 31 may have a linear shape in the cross-sectional view.
The corner portion 32 is formed in a ridge shape extending in the bottle axis O direction when viewed from the outside in the radial direction. The corner portion 32 may be formed in a band shape having a width in the circumferential direction and extending in the bottle axis O direction when viewed from the outside in the radial direction.

The corner portion 32 is formed with a first vertically convex rib 33 extending in the bottle axis O direction when viewed from the outside in the radial direction.

The first vertically convex rib 33 is formed separately on each of the plurality of corner portions 32. The first vertically 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 vertically convex rib 33 is wider than the width of the corner portion 32. The first vertically convex rib 33 is integrally formed from the connection portion (hereinafter referred to as the lower end portion) 13a of the mouth portion 13 with the shoulder portion 15 to the central portion of the body portion 16 in the bottle axis O direction via the shoulder portion 15. ing. That is, the upper end portion of the first vertically convex rib 33 is located at the lower end portion 13a of the mouth portion 13, and the lower end portion of the first vertically convex rib 33 is located at the central portion of the body portion 16 in the bottle axis O direction. There is.

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

In the first vertically convex rib 33, the protruding heights of the portions located between the both ends in the bottle shaft O direction are equal to each other over the entire length in the bottle shaft O direction, and the protruding heights of the both ends in the bottle shaft O direction are equal. Decreases toward the outside in the bottle axis O direction. In the first vertically convex rib 33, the widths of the portions located between the both ends in the bottle shaft O direction are equal to each other over the entire length in the bottle shaft O direction, and the widths of both ends in the bottle shaft O direction are the bottle shaft. It becomes narrower toward the outside in the O direction. The first vertically convex rib 33 exhibits a convex curve shape in the cross-sectional view.

In the shoulder portion 15, a vertical groove 34 extending in the bottle axis O direction when viewed from the outside in the radial direction is formed in a portion located between the first vertically convex ribs 33 adjacent to each other in the circumferential direction.

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

In the vertical groove 34, the depths of the portions located between the both ends in the bottle shaft O direction are equal to each other over the entire length in the bottle shaft O direction, and the depths of the both ends in the bottle shaft O direction are the bottle shaft O. It becomes shallower toward the outside of the direction. In the vertical groove 34, the widths of the portions located between the both ends in the bottle axis O direction are equal to each other over the entire length in the bottle axis O direction, and the widths of both ends in the bottle axis O direction are the widths in the bottle axis O direction. It becomes narrower toward the outside. A plurality of vertical grooves 34 are formed on the surface portion 31 at intervals in the circumferential direction. One vertical groove 34 is formed in the central portion of the surface portion 31 in the circumferential direction. The inner surface of the vertical groove 34 has a concave curved shape in the cross-sectional view.

A second vertically convex rib 35 extending in the bottle axis O direction when viewed from the outside in the radial direction is formed between the first vertically convex ribs 33 adjacent to each other in the circumferential direction.

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

The distance between the lower end of the second vertically convex rib 35 and the lower end of the first vertically convex rib 33 in the bottle axis O direction when viewed from the outside in the radial direction is the bottle axis O direction of the second vertically convex rib 35. It is equivalent to the size of. The distance between the lower end of the second vertically convex rib 35 and the lower end of the first vertically convex rib 33 in the bottle axis O direction when viewed from the outside in the radial direction is the bottle shaft of the second vertically convex rib 35. It may be different from the size in the O direction.

When viewed from the outside in the radial direction, the distance between the lower end of the second vertical convex rib 35 and the lower end of the first vertical convex rib 33 in the bottle axis O direction is the lower end of the second vertical convex rib 35. It is larger than the distance between the lower end of the vertical groove 34 and the bottle axis O direction. When viewed from the outside in the radial direction, the distance between the lower end of the second vertically convex rib 35 and the lower end of the first vertically convex rib 33 in the bottle axis O direction is set to the lower end of the second vertically convex rib 35. It may be less than or equal to the distance between the lower end portion of the vertical groove 34 and the bottle axis O direction.

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

In the second vertically convex rib 35, the protruding heights of the portions located between the both ends in the bottle shaft O direction are equal to each other over the entire length in the bottle shaft O direction, and the protruding heights of the both ends in the bottle shaft O direction are equal. Decreases toward the outside in the bottle axis O direction. In the second vertically convex rib 35, the widths of the portions located between the both ends in the bottle shaft O direction are equal to each other over the entire length in the bottle shaft O direction, and the widths of both ends in the bottle shaft O direction are the bottle shaft. It becomes narrower toward the outside in the O direction. The second vertically convex rib 35 exhibits a convex curve shape in the cross-sectional view.

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

As described above, according to the double container 1 according to the present embodiment, since the first vertically convex rib 33 is formed, the first vertically convex rib of the outer container 11 and the first vertically convex rib of the inner container 12 are formed at the time of blow molding. It is possible to provide a minute gap between the one vertically convex rib and the contents, and by allowing the outside air from the outside air introduction hole 17 to enter the minute gap, the inner container starts from the minute gap. The volume 12 can be reduced and deformed while being peeled from the outer container 11.

Since the first vertically convex rib 33 is integrally formed from the lower end portion 13a of the mouth portion 13 to the central portion (hereinafter referred to as a pressed portion) in the body portion 16 in the bottle axis O direction via the shoulder portion 15. When the pressure on the pressed portion toward the inside in the radial direction is released, the portion of the above-mentioned minute gap located in the pressed portion can be extended along the first vertically convex rib 33. , The peeling of the inner container 12 from the outer container 11 can be reliably propagated from the pressed portion to the shoulder portion 15.

Since the upper end of the first vertical convex rib 33 is located at the lower end 13a of the mouth portion 13, a minute amount between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12 is formed. The gap can be communicated with 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.

From the above, it becomes possible to smoothly proceed the peeling of the inner container 12 with respect to the outer container 11 at the shoulder portion 15 and the body portion 16, and it is possible to reduce the remaining amount of the contents.

Since the vertical rib extending downward from the lower end portion 13a of the mouth portion 13, which can provide a minute gap between the outer container 11 and the inner container 12, is not concave but convex, the above-mentioned upper portion. It is possible to allow a minute gap between the outer container 11 and the inner container 12 to communicate with the upper gap without narrowing the gap, and the inner container 12 is surely peeled off from the outer container 11 at the shoulder portion 15 and the body portion 16. Can proceed smoothly.

Since the first vertically convex rib 33 is formed not on the flexible surface portion 31 but on the corner portion 32 having high rigidity, the first vertically convex rib 33 is formed on the body portion 16 to form the inner container 12. It is possible to suppress that the body portion is less likely to be reduced in volume and deformed, and that the flexibility of the surface portion of the pressed portion of the outer container 11 is lost.

In the shoulder portion 15, a vertical groove 34 extending in the bottle axis O direction when viewed from the outside in the radial direction is formed in a portion located between the first vertically convex ribs 33 adjacent to each other in the circumferential direction, and thus blow. At the time of molding, a minute gap can be surely provided between the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12, and the vertical length of the outer container 11 is reduced as the contents are reduced. Starting from between the groove and the vertical groove of the inner container 12, the shoulder portion of the inner container 12 can be easily peeled off from the shoulder portion of the outer container 11.

Since the second vertically convex rib 35 is formed between the first vertically convex ribs 33 adjacent to each other in the circumferential direction, the second vertically convex rib of the outer container 11 and the second of the inner container 12 are formed during blow molding. It is possible to provide a slight gap between the vertically convex rib and the shoulder portion 15 and the body portion 16, and a large number of slight gaps are provided between the outer container 11 and the inner container 12 over the entire length in the circumferential direction. Can be provided.
Since the second vertically convex rib 35 is located above the lower end portion of the first vertically convex rib 33, the rigidity of the pressed portion of the body portion 16 is increased by providing the second vertically convex rib 35. Can be suppressed.

Since the vertical grooves 34 and the second vertical convex ribs 35 are alternately provided in the circumferential direction between the first vertical convex ribs 33 adjacent to each other in the circumferential direction, the second vertical groove 34 of the outer container 11 is provided at the time of blow molding. A slight gap can be reliably provided between the vertically convex rib and the second vertically convex rib of the inner container 12.

Since the vertical groove is provided between the first vertical convex rib and the second vertical convex rib adjacent to each other in the circumferential direction, the first vertical convex rib of the outer container 11 and the first vertical convex rib of the inner container 12 are provided during blow molding. It is possible to surely provide a minute gap between the 1 vertical convex rib and a slight gap between the 2nd vertical convex rib of the outer container 11 and the 2nd vertical convex rib of the inner container 12, respectively. At least on the shoulder portion 15, the inner container 12 can be easily reduced in volume and deformed evenly with little bias over the entire length in the circumferential direction.

Since the outside air introduction hole 17 is provided above the shoulder portion 15, as the contents decrease, the outside air from the outside air introduction hole 17 flows into the lower end portion of the mouth portion of the outer container 11 and the mouth of the inner container 12. Smoothly pass through the upper gap provided between the lower end of the portion 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 this order. Therefore, the shoulder portion and the body portion of the inner container 12 can be reliably reduced in volume and deformed.

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

The first vertically convex rib 33 may be formed on a part of a plurality of corner portions 32, or may be formed on, for example, only one corner portion 32.
The first vertically convex rib 33, the vertical groove 34, and the second vertically convex rib 35 may extend in the bottle axis O direction while being bent when viewed from the outside in the radial direction.
It is not necessary to form the second vertical convex rib 35 and the vertical groove 34 on the surface portion 31.
The body portion 16 may extend straight in the bottle axis O direction over the entire length in the bottle axis O direction.

In addition, it is possible to appropriately replace the components in the embodiment with well-known components without departing from the spirit of the present invention, and the embodiments and the modifications may be appropriately combined.

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 Square 33 1st vertical convex rib 34 Vertical groove 35 2nd vertical convex rib O Bottle shaft

Claims (6)

An inner container whose volume is reduced and deformed as the contents to be accommodated is reduced, and an elastically deformable outer container in which the inner container is contained are provided, and the mouth, shoulder, body, and bottom are provided in the direction of the bottle axis. Arranged in this order from top to bottom along
An outside air introduction hole for introducing outside air is provided 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 portion of the mouth portion with the shoulder portion.
The body portion is composed of a plurality of surface portions connected in the circumferential direction via corner portions.
A first longitudinal convex rib extending in the bottle axial direction when viewed from the outside in the radial direction is formed at the corner portion.
The first vertically convex rib is a double container integrally formed from a connecting portion of the mouth portion with the shoulder portion to the central portion of the body portion in the bottle axial direction via the shoulder portion. The first vertically convex rib is formed separately at each of the plurality of corner portions, and the first vertical convex rib is formed separately.
According to claim 1, a vertical groove extending in the bottle axis direction when viewed from the outside in the radial direction is formed in a portion of the shoulder portion located between the first vertically convex ribs adjacent to each other in the circumferential direction. The double container described. The first vertically convex rib is formed separately at each of the plurality of corner portions, and the first vertical convex rib is formed separately.
A second vertically convex rib extending in the bottle axis direction when viewed from the outside in the radial direction is formed between the first vertically convex ribs adjacent to each other in the circumferential direction.
The double according to claim 1 or 2, wherein the second vertically convex rib is integrally formed on the shoulder portion and the body portion, and is located above the lower end portion of the first vertically convex rib. container. The first vertically convex rib is formed separately at each of the plurality of corner portions, and the first vertical convex rib is formed separately.
In the shoulder portion, a vertical groove extending in the bottle axis direction when viewed from the outside in the radial direction is formed in a portion located between the first vertically convex ribs adjacent to each other in the circumferential direction.
A second vertically convex rib extending in the bottle axis direction when viewed from the outside in the radial direction is formed between the first vertically convex ribs adjacent to each other in the circumferential direction.
The second vertically convex rib is integrally formed on the shoulder portion and the body portion, and is located above the lower end portion of the first vertically convex rib.
The double container according to any one of claims 1 to 3, wherein the vertical groove and the second vertical convex rib are provided alternately 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 adjacent to each other in the circumferential direction. The double container according to any one of claims 1 to 5, wherein the outside air introduction hole is provided above the shoulder portion.

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