JP2023050603A - double container - Google Patents

Abstract

To enhance restoring force of an outer container without inhibiting smooth peeling of an inner container from an inner surface of the outer container.SOLUTION: There are provided an inner container 12 deformed in volume reduction according to decrease of a content to be stored, and an outer container 11 that is elastically deformable, to which the inner container is internally attached. A mouth part 13, a shoulder part 15, a trunk part 16, and a bottom part 14 are arranged in this order along a bottle axis O direction from an upper portion toward a lower portion. As the content decreases, there is provided an outside air introduction hole 17 for introducing outside air into between the outer container and the inner container; a peripheral groove 21 extending in a recess circumferential direction toward an inner side in a radial direction is formed onto the trunk part; and a longitudinal projection part 22 that splits the peripheral groove into a circumferential direction is formed on an inner face of the peripheral groove.SELECTED DRAWING: Figure 1

Description

The present invention relates to double containers.

Conventionally, as shown in Patent Document 1 below, for example, an inner container that is deformed to reduce the volume as the content contained therein decreases, and an elastically deformable outer container in which the inner container is accommodated. A shoulder portion, a body portion, and a bottom portion are arranged in this order from top to bottom along the axial direction of the bottle. Double containers with holes are known.

JP 2019-131256 A

However, in the conventional double container, there is room for improvement in increasing the restoring force of the outer container without hindering the smooth separation of the inner container from the inner surface of the outer container.

The present invention has been made in view of the circumstances described above, and provides a double container that can increase the restoring force of the outer container without hindering the smooth separation of the inner container from the inner surface of the outer container. intended to provide

The double container of the present invention comprises an inner container that is deformed and reduced in volume as the content contained therein decreases, and an elastically deformable outer container in which the inner container is accommodated. , and the bottom portion are arranged in this order from top to bottom along the axial direction of the bottle, and are provided with an outside air introduction hole for introducing outside air between the outer container and the inner container as the contents decrease. A circumferential groove extending in the circumferential direction is formed in the body portion and extends radially inward, and the inner surface of the circumferential groove is formed with vertical projections dividing the circumferential groove in the circumferential direction.

Since the circumferential groove is formed in the body, it is possible to increase the rigidity of the body of the outer container. When this external force (pressing force) is released, the body of the outer container can be smoothly restored and deformed.
Since the inner surface of the circumferential groove is formed with vertical projections that divide the circumferential groove in the circumferential direction, external air introduced between the inner container and the outer container through the external air introduction hole moves vertically along the vertical projections. With the vertical projection as a starting point, the inner container can be easily separated from the inner surface of the outer container in the circumferential groove. As a result, the inner container, including the portion provided with the circumferential groove, can be smoothly separated from the inner surface of the outer container as the contained contents decrease.

The outer surface of the vertical protrusion facing radially outward may be vertically connected to the outer peripheral surface of each portion of the double container that is vertically connected to the circumferential groove without steps.

The outer surface of the vertical convex portion facing radially outward is connected to the outer peripheral surface of each portion of the double container that is vertically connected to the circumferential groove without a step in the vertical direction. It is possible to make it easier for the outside air introduced between the container and the outer container to reliably pass through the vertical protrusions in the vertical direction.

At least a lower portion of the body portion may extend radially outward as it goes downward, and the circumferential groove may be provided in the lower portion of the body portion.

A circumferential groove is provided in the lower portion of the body portion, which extends outward in the radial direction as it goes downward, so that the outer container is less likely to undergo restoration deformation after squeeze deformation. Rigidity is enhanced, and the lower portion of the trunk portion of the outer container can be easily restored and deformed after squeeze deformation.
Since the inner surface of the circumferential groove is formed with a vertical protrusion, it is possible to ensure smooth separation of the inner container from the inner surface of the outer container in the lower portion of the body.

According to the present invention, the restoring force of the outer container can be increased without hindering the smooth peeling of the inner container from the inner surface of the outer container.

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

Hereinafter, a double container according to one embodiment will be described with reference to the drawings.
As shown in FIG. 1, the double container 1 according to the present embodiment includes an inner container 12 that is deformed to reduce the volume of the contents contained therein, and an elastically deformable outer container in which the inner container 12 is accommodated. 11. The outer surface of the inner container 12 is separably provided on 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 detachable manner.
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 in 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. It is formed by That is, the double container 1 is a biaxially stretched blow container.

The inner container 12 and the outer container 11 are made of a 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).
In the illustrated example, the inner container 12 and the outer container 11 are each made of PET (polyethylene terephthalate).

The double container 1 has a mouth portion 13 , a shoulder portion 15 , a body portion 16 and a bottom portion 14 . The mouth portion 13, shoulder portion 15, body portion 16 and bottom portion 14 are arranged coaxially with a common axis in this order.
Hereinafter, this common axis will be referred to as a bottle axis O, the mouth portion 13 side of the double container 1 along the bottle axis O will be referred to as the upper side, and the bottom portion 14 side of the double container 1 will be referred to as the lower side. When viewed from the direction of the bottle axis O (vertical direction), the direction intersecting the bottle axis O is called the radial direction, and the direction rotating around the bottle axis O is called the circumferential direction.

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

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 direction of the bottle axis O is about 150 mm, and the inner capacity of the double container 1 is 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 portion of the mouth portion of the inner container 12 so as to protrude radially outward and extend continuously over the entire length in the circumferential direction. The flange portion is placed on the upper opening edge of the mouth portion of the outer container 11 .

On the outer peripheral surface of the mouth of the outer container 11, there are a locking projection 18 to which a cap (not shown) is locked, a sealed projection 19 to which a peripheral wall portion of the cap (not shown) is externally fitted, and a neck ring 20. They are formed in this order from top to bottom.
The locking projection 18, the sealed projection 19, and the neck ring 20 protrude radially outward from the mouth of the outer container 11 and extend continuously over the entire length in the circumferential direction. An airtight seal is formed between the outer peripheral surface of the to-be-sealed projection 19 and the inner peripheral surface of the peripheral wall portion of the cap (not shown). The outer diameter of the neck ring 20 is larger than the outer diameter of the sealed protrusion 19 .
Note that the cap may be screwed onto the mouth of the outer container 11 . Neck ring 20 may not be provided.

An outside air introduction hole 17 is provided above the shoulder portion 15 for introducing outside air between the container 12 and the inner container 12 as the contents decrease. 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 positioned radially outermost in the projected portion 19 to be sealed, and is positioned above the sealing surface that extends continuously over the entire length in the circumferential direction.
The formation position of the outside air introduction hole 17 is not limited to the mouth portion of the outer container 11, and may be, for example, the trunk portion, shoulder portion, or bottom portion of the outer container 11 other than the mouth portion. Alternatively, it may be between the upper opening edge of the mouth of the outer container 11 and the lower surface of the flange of the mouth of the inner container 12 .

The shoulder portion 15 extends radially outward from the lower end portion of the mouth portion 13 downward.
At least the lower portion of the trunk portion 16 extends outward in the radial direction as it goes downward. In the illustrated example, the upper portion of the body portion 16 extends substantially straight in the bottle axis O direction. A portion of the lower portion of the body portion 16 excluding the lower end portion 16a has a curved shape that is depressed radially inward when viewed from the radially outer side. A lower end portion 16a of the body portion 16 has a curved shape protruding radially outward when viewed from the radially outer side. 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 approximately 62 mm. Note that the body portion 16 may extend radially outward over the entire length in the direction of the bottle axis O from the top to the bottom. The lower portion of the body portion 16, the lower end portion 16a of the body portion 16, and the portion of the lower portion of the body portion 16 other than the lower end portion 16a may extend linearly or curvedly when viewed from the outside in the radial direction. May be extended.
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 goes downward. The bottom portion 14 has 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 is capable of being squeeze deformed (elastically deformed), and the inner container 12 contracts and deforms as the outer container 11 is squeezed. The body portion 16, the shoulder portion 15 and the bottom portion 14 are continuous in the direction of the bottle axis O without a step.

The body portion 16 and the shoulder portion 15 are configured by connecting a plurality of face portions 31 in the circumferential direction via 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. In addition, the shoulder portion 15 may have, for example, a circular shape or an elliptical shape in the cross-sectional view.

The surface portion 31 has a curved shape protruding outward in the radial direction in a cross-sectional view perpendicular to the bottle axis O. As shown in FIG. In addition, the surface portion 31 may have a linear shape in the cross-sectional view.
The corner portion 32 is formed in a ridgeline shape extending in the direction of the bottle axis O when viewed from the outside in the radial direction. Note that the corner portion 32 may be formed in a belt shape extending in the direction of the bottle axis O and having a width in the circumferential direction when viewed from the outside in the radial direction.

The corner portion 32 is formed with a first vertical convex rib 33 extending in the direction of the bottle axis O when viewed from the radially outer side. Note that the first vertical convex rib 33 may not be provided.

The first vertical convex ribs 33 are separately formed on the plurality of corners 32 . The first vertical convex rib 33 extends straight in the direction of the bottle axis O 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 corner portion 32 . The first vertical convex rib 33 is integrally formed from a connection portion (hereinafter referred to as a lower end portion) 13a with the shoulder portion 15 of the mouth portion 13 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 vertical convex rib 33 is positioned at the lower end portion 13a of the mouth portion 13, and the lower end portion of the first vertical convex rib 33 is positioned at the center portion of the barrel portion 16 in the direction of the bottle axis O. there is

Here, the lower end portion 13a of the mouth portion 13 is located below the neck ring 20 and serves as a boundary portion that extends during blow molding. An upper gap is provided between the outer container 11 and the inner container 12 at the lower end portion 13 a of the mouth portion 13 . The upper gap is intermittently provided 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 into the outer preform for forming the outer container 11 before the double container 1 becomes a biaxially stretched blown container. But it is provided. In addition, 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 circumferential length by the plurality of vertical ribs. You may The upper gap may extend continuously over the entire circumferential length.

In the first vertical convex rib 33, the protrusion height of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the protrusion height of both ends in the direction of the bottle axis O is the same. becomes lower toward the outer side in the bottle axis O direction. In the first vertical convex rib 33, the width of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the width of both ends in the direction of the bottle axis O is equal to It becomes narrower toward the outer side in the O direction. The first vertical convex rib 33 has a convex curved shape in the cross-sectional view.

A longitudinal groove 34 extending in the direction of the bottle axis O when viewed from the radially outer side is formed in a portion of the shoulder portion 15 located between the first vertical convex ribs 33 adjacent to each other in the circumferential direction. Note that the vertical groove 34 may not be provided.

The longitudinal groove 34 extends straight in the bottle axis O direction when viewed from the radially outer side. The upper end portion of the vertical groove 34 is located below the lower end portion 13 a of the mouth portion 13 . The longitudinal groove 34 is integrally formed from the upper end of the shoulder portion 15 to the upper end of the trunk portion 16 . Note that 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 . Note that the width of the vertical groove 34 may be less than or equal to the width of the first vertical convex rib 33 .

In the vertical groove 34, the depth of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the depth of both ends in the direction of the bottle axis O is the same. It becomes shallower toward the outside of the direction. In the vertical groove 34, the width of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the width of both ends in the direction of the bottle axis O is equal to the width in the direction of the bottle axis O. It narrows towards the outside. A plurality of vertical grooves 34 are formed in the surface portion 31 at intervals in the circumferential direction. One longitudinal groove 34 is formed in the circumferential central portion of the face portion 31 . The inner surface of the longitudinal groove 34 has a concave curved shape in the cross-sectional view.

Between the first vertical convex ribs 33 adjacent to each other in the circumferential direction, a second vertical convex rib 35 extending in the direction of the bottle axis O as viewed from the radially outer side is formed. Note that the second vertical convex rib 35 may not be provided.

The second vertical convex rib 35 extends straight in the bottle axis O direction when viewed from the radially outer side. 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 rib 35 is shorter than the length of the first vertical rib 33 . The lower ends of the second vertical ribs 35 are positioned below the lower ends of the vertical grooves 34 and above the lower ends of the first vertical ribs 33 . The positions of the upper ends of the second vertical ribs 35 and the first vertical ribs 33 in the direction of the bottle axis O are the same.

The projection height of the second vertical rib 35 is equal to the projection height of the first vertical projection rib 33 . The protrusion heights of the second vertical ribs 35 and the first vertical ribs 33 may be different from each other. The width of the second vertical rib 35 is narrower than the width of the first vertical rib 33 . Note that the width of the second vertical rib 35 may be equal to or greater than the width of the first vertical rib 33 .

In the second vertical convex rib 35, the protrusion height of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the protrusion height of both ends in the direction of the bottle axis O is the same. becomes lower toward the outer side in the bottle axis O direction. In the second vertical convex rib 35, the width of the portion located between both ends in the direction of the bottle axis O is the same over the entire length in the direction of the bottle axis O, and the width of both ends in the direction of the bottle axis O is equal to It becomes narrower toward the outer side in the O direction. The second vertical convex rib 35 has a convex curved shape in the cross-sectional view.

The vertical grooves 34 and the second vertical convex ribs 35 are alternately provided on the surface portion 31 in the circumferential direction. At least one of the plurality of vertical grooves 34 provided in one surface portion 31 is provided between the first vertical convex rib 33 and the second vertical convex rib 35 adjacent to each other in the circumferential direction. The first vertical convex rib 33, the vertical groove 34 and the second vertical convex rib 35 are arranged in a row in the circumferential direction.
The first vertical rib 33 and the second vertical rib 35 may be adjacent to each other in the circumferential direction without the vertical groove 34 interposed. The first vertical rib 33, the vertical groove 34, and the second vertical rib 35 may be spaced apart in the circumferential direction.

In the present embodiment, a circumferential groove 21 extending in the circumferential direction is formed in the body portion 16 so as to be recessed radially inward. The inner surface of the circumferential groove 21 presents a curved shape that is recessed radially inward in a vertical cross-sectional view along the bottle axis O direction. Vertical protrusions 22 are formed on the inner surface of the circumferential groove 21 to divide the circumferential groove 21 in the circumferential direction. A plurality of vertical protrusions 22 are provided at intervals in the circumferential direction. The plurality of vertical protrusions 22 are provided at equal intervals over the entire circumferential length of the circumferential groove 21 . The vertical protrusion 22 is formed in a rectangular parallelepiped shape elongated in the bottle axis O direction.

In the illustrated example, the circumferential groove 21 is provided in the lower portion of the body portion 16 . The circumferential groove 21 is provided in the lower end portion 16a of the body portion 16. As shown in FIG. The circumferential groove 21 is provided over the entire length of the lower end portion 16a of the body portion 16 in the bottle axis O direction.

The vertical protrusion 22 is defined by an outer surface facing radially outward and a pair of side surfaces connecting both ends of the outer surface in the circumferential direction and the inner surface of the circumferential groove 21 . The side surfaces of the vertical protrusions 22 extend in a direction away from each other in the circumferential direction toward the inner side in the radial direction. The outer surface of the vertical convex portion 22 is connected to the outer peripheral surface of each portion of the double container 1 that is connected to the circumferential groove 21 in the bottle axis O direction without a step. The upper end of the outer surface of the vertical protrusion 22 continues to the outer peripheral surface of the body portion 16 without steps, and the lower end of the outer surface of the vertical protrusion 22 continues to the outer peripheral surface of the peripheral wall portion 14b of the bottom portion 14 without steps.

As described above, according to the double container 1 according to the present embodiment, since the circumferential groove 21 is formed in the body portion 16, the rigidity of the body portion of the outer container 11 can be increased. After applying an external force to the body 16 to squeeze-deform the body 16 radially inward, the body of the outer container 11 can be smoothly restored and deformed when the external force (pressing force) is released. .

The inner surface of the circumferential groove 21 is formed with vertical projections 22 that divide the circumferential groove 21 in the circumferential direction. It becomes easier to pass through the vertical protrusions 22 in the bottle axis O direction, and the inner container 12 can be easily separated from the inner surface of the outer container 11 in the circumferential grooves 21 starting from the vertical protrusions 22 . As a result, the inner container 12, including the portion where the circumferential groove 21 is provided, can be smoothly peeled off from the inner surface of the outer container 11 as the contained contents decrease.

The outer surface of the vertical protrusion 22 facing radially outward is connected to the outer peripheral surface of each portion of the double container 1 that is connected to the circumferential groove 21 in the direction of the bottle axis O without steps in the direction of the bottle axis O. , the outside air introduced between the inner container 12 and the outer container 11 from the outside air introduction hole 17 can be made to easily pass through the vertical convex portion 22 in the bottle axis O direction.

Since the circumferential groove 21 is provided in the lower portion of the trunk portion 16 that extends outward in the radial direction as it goes downward, and the outer container 11 is less likely to be restored and deformed after the squeeze deformation, the trunk portion of the outer container 11 is The rigidity of the lower portion of the outer container 11 is increased, and the lower portion of the body portion of the outer container 11 can be easily restored and deformed after the squeeze deformation.
Since the vertical protrusions 22 are formed on the inner surface of the circumferential groove 21 , it is possible to ensure smooth separation of the inner container 12 from the inner surface of the outer container 11 in the lower portion of the body portion 16 .

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

A stepped portion may be provided between the outer surface of the vertical convex portion 22 and the outer peripheral surface of each portion of the double container 1 that is connected to the circumferential groove 21 in the bottle axis O direction.
The vertical convex portion 22 may be formed in a cubic shape, for example.
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 constituent elements in the above embodiments with known constituent elements without departing from the scope of the present invention, and the above embodiments and the above modifications may be combined as appropriate.

1 Double Container 11 Outer Container 12 Inner Container 13 Mouth 14 Bottom 15 Shoulder 16 Body 17 Outside Air Introduction Hole 21 Circumferential Groove 22 Vertical Projection

Claims (3)

An inner container that is deformed and reduced in volume as the contained contents decrease, and an elastically deformable outer container in which the inner container is accommodated. are arranged in this order from top to bottom along
An outside air introduction hole for introducing outside air between the outer container and the inner container as the contents decrease,
A peripheral groove extending in the circumferential direction is formed in the body portion and is recessed toward the inner side in the radial direction,
A double container, wherein the inner surface of the circumferential groove is formed with vertical projections dividing the circumferential groove in the circumferential direction. 2. The method according to claim 1, wherein the outer surface of the vertical protrusion facing radially outward is vertically connected to the outer peripheral surface of each portion of the double container that is vertically connected to the circumferential groove without steps. Double container as described. At least the lower portion of the trunk portion extends outward in the radial direction as it goes downward,
The double container according to claim 1 or 2, wherein the circumferential groove is provided in the lower part of the body.

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