Double container

Abstract

To suppress the peeling difficulty of an inner container from an outer container on a shoulder when a trunk of the outer container is deformed to be restored by releasing pressurization after the trunk is pressurized inside in a radial direction.SOLUTION: This double container comprises: an inner container 12 deformed to be reduced in volume following reduction of a stored content; and an outer container 11 that stores the inner container. A mouth 13, a shoulder 15, a trunk 16, and a bottom 14 are arranged in order downward. The mouth is provided with an outside air introduction hole 17 through which outer air is introduced following reduction of the stored content and which is provided between the outer container and the inner container. At least the trunk of the outer container is formed to be elastically deformable. On the upper parts of the trunks of the outer and inner containers, a plurality of pairs of inclined grooves 21 of V shapes tapered downward seen from the outside in a radial direction is provided in a peripheral direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a double container. [Background technology]

[0002] Conventionally, as shown in Patent Document 1 below, for example, double containers have been known which include an inner container that shrinks in volume as the contents contained therein decrease, and an outer container in which the inner container is housed, and in which the mouth, shoulder, body, and bottom are arranged in this order from top to bottom along the axial direction of the bottle, and the mouth is provided with an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-30614 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional double-walled container, when the body is pressed radially inward and then this pressure is released to allow the body of the outer container to restore its original shape, the inner container is difficult to separate from the outer container at the shoulder, which may make it difficult to secure an airway from the outside air inlet hole to the body.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a double container that can prevent the inner container from becoming difficult to separate from the outer container at the shoulder when the body is pressed radially inward and then this pressure is released to allow the body of the outer container to restore and deform. [Means for solving the problem]

[0006] The double container of the present invention comprises an inner container that undergoes volume reduction deformation as the contents contained therein decrease, and an 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 axial direction, the mouth is provided with an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease, at least the body of the outer container is formed to be elastically deformable, and a plurality of pairs of inclined grooves that present a V-shape that points downward when viewed from the outside in the radial direction are provided along the circumferential direction at the upper part of the body of each of the outer container and the inner container. In the upper part of the body of each of the outer container and the inner container, an upper vertical groove extending in the up-down direction is provided at the same circumferential position as the lower ends of the pair of inclined grooves, and the lower ends of the pair of inclined grooves are connected via the lower ends of the upper vertical grooves. are.

[0007] The upper part of the body of each of the outer container and the inner container is provided with a plurality of pairs of inclined grooves along the circumferential direction, each of which has a V-shape that tapers downward when viewed from the outside in the radial direction. Therefore, when a portion of the body located below the upper part is pressed and elastically deformed radially inward, stress tends to concentrate in the portion of the body where the lower ends of the pair of inclined grooves are located (hereinafter referred to as the valley portion). Therefore, when the pressure on the body is released and the body of the outer container is restored and deformed, the inner container is peeled from the outer container starting from the valley portion of the body, which facilitates this peeling to progress upward toward the shoulder. This makes it easy to ensure an airway from the outside air introduction hole through the shoulder to the body when the body is pressed radially inward and then the pressure is released and the body of the outer container is restored and deformed.

[0009] An upper vertical groove extending in the vertical direction is provided at the upper part of the body of each of the outer container and the inner container at the same circumferential position as the lower ends of the pair of inclined grooves. This makes it possible to make the above-mentioned peeling that occurs starting from the valley part of the body follow the upper vertical groove and progress upward toward the shoulder, making it easy to secure the above-mentioned airway when the body of the outer container is restored and deformed.

[0010] before A lower end portion of the vertical groove may straddle lower ends of the pair of inclined grooves in the vertical direction.

[0011] The lower ends of the pair of inclined grooves are connected via the lower end of the upper vertical groove, and the lower end of the upper vertical groove straddles the lower ends of the pair of inclined grooves in the vertical direction, so that the aforementioned peeling that occurs starting from the valley portion of the body can be prevented from spreading, for example, in the circumferential direction, and can be made to reliably progress upward toward the shoulder side.

[0012] The double container of the present invention comprises an inner container that undergoes volume reduction deformation as the contents contained therein decrease, and an 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 axial direction, the mouth is provided with an outside air inlet hole that introduces outside air between the outer container and the inner container as the contents decrease, at least the body of the outer container is formed to be elastically deformable, and a plurality of pairs of inclined grooves that are V-shaped and point downward when viewed from the outside in the radial direction are provided along the circumferential direction at the upper part of the body of each of the outer container and the inner container, A plurality of vertical grooves extending in the vertical direction are provided at intervals in the circumferential direction in the lower part of the body of each of the outer container and the inner container. The upper ends of the lower longitudinal grooves are located higher in the circumferential direction as they are spaced further apart from the lower ends of the inclined grooves.

[0013] A plurality of lower vertical grooves extending in the up-down direction are provided at intervals in the circumferential direction at the lower part of the body of each of the outer container and the inner container, so that when the part of the body that is located below the upper part is pressed radially inward and then this pressure is released, the body of the outer container can be smoothly restored and deformed.

[0015] Since the upper ends of the multiple lower vertical grooves are located higher the further they are circumferentially away from the lower ends of the inclined grooves, it is easier to smoothly restore and deform the entire body of the outer container that is located below the inclined grooves after the aforementioned pressure is released.

[0016] The body portion may extend radially outward from top to bottom.

[0017] The body portion extends radially outward from top to bottom, and the maximum diameter of the shoulder portion is smaller than the diameter of the portion of the body portion located below the upper end, making the shoulder portion less likely to stretch during blow molding of the double-walled container. Therefore, when the body portion is pressed radially inward and then this pressure is released to restore and deform the body portion of the outer container, the inner container is particularly less likely to peel from the outer container at the small-diameter shoulder portion. This significantly achieves the aforementioned effect of preventing the inner container from becoming less likely to peel from the outer container at the shoulder portion when the body portion of the outer container is restored and deformed. [Effects of the Invention]

[0018] According to this invention, when the body portion is pressed radially inward and then this pressure is released to allow the body portion of the outer container to restore its original shape, it is possible to prevent the inner container from becoming difficult to separate from the outer container at the shoulder portion. [Brief explanation of the drawings]

[0019] [Figure 1] 1 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. DETAILED DESCRIPTION OF THE INVENTION

[0020] 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 comprises an inner container 12 that shrinks and deforms as the contents stored therein decrease, and an outer container 11 in which the inner container 12 is housed. The outer surface of the inner container 12 is separably provided on the inner surface of the outer container 11. In the example shown, the inner container 12 is highly flexible and is peelably 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.

[0021] 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.

[0022] 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).

[0023] The double container 1 has a mouth 13, a shoulder 15, a body 16, and a bottom 14. The mouth 13, the shoulder 15, the body 16, and the bottom 14 are arranged coaxially with a common axis and are arranged in this order along the common axis. Hereinafter, this common axis will be referred to as the bottle axis O, the mouth 13 side along the bottle axis O direction will be referred to as the upper side, the bottom 14 side along the bottle axis O direction will be referred to as the lower side, and the bottle axis O direction will be referred to as the up-down direction. When viewed from the up-down direction, the direction intersecting the bottle axis O will be referred to as the radial direction, and the direction going around the bottle axis O will be referred to as the circumferential direction.

[0024] 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.

[0025] The vertical size of the double container 1 is, for example, 115 mm to 220 mm. The internal volume of the double container 1 is, for example, 150 ml to 600 ml. In the illustrated example, the vertical size of the double container 1 is approximately 150 mm, and the double container 1 is for an internal volume of 200 ml. The double container 1 has a circular shape in cross section perpendicular to the bottle axis O over the entire length in the vertical direction.

[0026] A flange 12a 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 12a is placed on the upper opening edge of the mouth of the outer container 11. On the outer peripheral surface of the mouth of the outer container 11, there are formed, in this order from top to bottom, a male threaded portion 18 onto which a cap (not shown) is screwed, a sealed protrusion 19 onto which the peripheral wall portion of the cap (not shown) is fitted.

[0027] The sealed projection 19 and the neck ring 20 project radially outward from the opening 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 neck ring 20 is located below the peripheral wall of the cap. The cap may be fitted to the mouth of the outer container 11 by undercutting.

[0028] An outside air introduction hole 17 is provided in the mouth 13 to introduce outside air between the outer container 11 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 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 outside air introduction hole 17 may be formed at a position between the upper opening edge of the mouth of the outer container 11 and the lower surface of the flange portion 12a of the inner container 12, for example.

[0029] The lower end 13a of the mouth 13, which is located below the neck ring 20, extends straight in the vertical direction. The shoulder portion 15 extends downward from the lower end portion 13a of the mouth portion 13 and radially outward. The bottom portion 14 is formed in a cylindrical shape with a bottom. A peripheral wall portion 14b of the bottom portion 14 extends radially inward as it extends downward.

[0030] The body 16 extends radially outward from top to bottom. In a vertical cross section taken along the bottle axis O, the body 16 has a curved shape that is recessed radially inward. However, the body 16 may also have a linear shape in the vertical cross section. The outer peripheral surface at the connection between the body 16 and the peripheral wall 14b of the bottom 14 forms the largest outer diameter portion of the double container 1. The outer diameter of this maximum outer diameter portion is, for example, 58 mm or more and 74 mm or less. In the illustrated example, the outer diameter of the maximum outer diameter portion of the double container 1 is approximately 63 mm. The outer diameter of the maximum outer diameter portion of the double container 1 is 1.5 times or more and less than 2 times the outer diameter of the lower end of the shoulder 15, which is the maximum outer diameter of the shoulder 15.

[0031] 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 accordance with the squeeze deformation of the outer container 11. The body 16, shoulder 15, and bottom 14 are connected without any steps in the vertical direction.

[0032] In this embodiment, a plurality of pairs of inclined grooves 21 are provided in the upper part of the body portion 16 along the circumferential direction, each of which has a V-shape that points downward when viewed from the outside in the radial direction. The inclined grooves 21 are provided in a portion of the body 16 that is located above the center in the up-down direction. Pairs of inclined grooves 21 that are adjacent to each other in the circumferential direction are connected at their upper ends so that multiple pairs of inclined grooves 21 extend continuously in a zigzag pattern over the entire circumferential length of the body 16. A circumferential gap may be provided between a pair of inclined grooves 21 adjacent to each other in the circumferential direction.

[0033] In the upper part of the body part 16, a first upper vertical groove (upper vertical groove) 22 extending in the up-down direction is provided at the same circumferential position as the lower ends of the pair of inclined grooves 21. A plurality of first upper longitudinal grooves 22 are provided at intervals in the circumferential direction. The lower ends of a pair of inclined grooves 21 are connected via the lower ends of the first upper longitudinal grooves 22. The lower ends of the first upper longitudinal grooves 22 straddle the lower ends of the pair of inclined grooves 21 in the up-down direction. The upper ends of the first upper longitudinal grooves 22 are located higher than the upper ends of the inclined grooves 21. The upper ends of the first upper longitudinal grooves 22 are located at the upper ends of the shoulder portions 15. The width of the first upper longitudinal grooves 22 is wider than the width of the inclined grooves 21. The depth of the first upper longitudinal grooves 22 is deeper than the depth of the inclined grooves 21. The first upper vertical groove 22 may be spaced upward from the lower end of the inclined groove 21, and the lower ends of the first upper vertical groove 22 and the inclined groove 21 may be located at the same position in the vertical direction.

[0034] A plurality of lower vertical grooves 23 extending in the up-down direction are provided at the lower part of the body part 16 at intervals in the circumferential direction. The lower longitudinal grooves 23 are provided at equal intervals in the circumferential direction. The lower longitudinal grooves 23 are provided separately at the same circumferential positions as the lower end of the inclined groove 21, the upper end of the inclined groove 21, and the center of the inclined groove 21, respectively. The lower longitudinal grooves 23 may be provided at positions spaced apart in the circumferential direction from the lower end of the inclined groove 21, the upper end of the inclined groove 21, and the center of the inclined groove 21, respectively. The lower longitudinal grooves 23 are not connected to the inclined groove 21 and the first upper longitudinal groove 22, and are spaced apart downward.

[0035] The upper ends of the multiple lower longitudinal grooves 23 are located higher the further they are circumferentially away from the lower ends of the inclined grooves 21. The upper ends of the multiple lower longitudinal grooves 23 are located higher than the center of the body 16 in the up-down direction. Of the multiple lower longitudinal grooves 23, the upper end of the lower longitudinal groove 23 located at the same circumferential position as the upper end of the inclined groove 21 is located higher than the lower end of the inclined groove 21, and the upper ends of the other lower longitudinal grooves 23 are located lower than the lower end of the inclined groove 21.

[0036] The lower ends of the multiple lower longitudinal grooves 23 are all located at the same vertical position. The length of the lower longitudinal groove 23 located at the same circumferential position as the lower end of the inclined groove 21 is the shortest among the multiple lower longitudinal grooves 23. The length of the lower longitudinal groove 23 located at the same circumferential position as the upper end of the inclined groove 21 is the longest among the multiple lower longitudinal grooves 23. The width of the lower longitudinal groove 23 is wider than the width of the inclined groove 21. The depth of the lower longitudinal groove 23 is deeper than the depth of the inclined groove 21. Although multiple longitudinal grooves shallower than the lower longitudinal grooves 23 are provided in the body 16, these longitudinal grooves may not be provided.

[0037] In the upper part of the body part 16, second upper vertical grooves 24 extending in the up-down direction are provided at the same circumferential position as the upper ends of the pair of inclined grooves 21. A plurality of second upper longitudinal grooves 24 are provided at intervals in the circumferential direction. The second upper longitudinal grooves 24 extend upward from the upper end of the inclined groove 21. The upper end of the second upper longitudinal groove 24 is located at the upper end of the shoulder portion 15. The width of the second upper longitudinal groove 24 is wider than the width of the inclined groove 21. The depth of the second upper longitudinal groove 24 is deeper than the depth of the inclined groove 21. The second upper vertical groove 24 may be spaced upward from the upper end of the inclined groove 21 or may protrude downward.

[0038] As described above, in the double container 1 according to this embodiment, a pair of inclined grooves 21, which have a V-shape that points downward when viewed from the outside in the radial direction, are provided along the circumferential direction in the upper part of the body 16. Therefore, when a part of the body 16 located below the upper part is pressed and elastically deformed radially inward, stress tends to concentrate in the part of the body 16 where the lower ends of the pair of inclined grooves 21 are located (hereinafter referred to as the valley part).

[0039] Therefore, when the pressure on the body 16 is released and the body of the outer container 11 is restored and deformed, the inner container 12 is peeled from the outer container 11 starting from the valley portion of the body 16, which makes it easier for this peeling to progress upward toward the shoulder 15. As a result, when the body 16 is pressed radially inward and then this pressure is released and the body of the outer container 11 is restored and deformed, an airway can be easily secured from the outside air introduction hole 17 through the shoulder 15 to the body 16.

[0040] An upper vertical groove 22 extending in the vertical direction is provided in the upper part of the body 16 at the same circumferential position as the lower ends of the pair of inclined grooves 21. This makes it possible to make the above-mentioned peeling that has started from the valley part of the body 16 progress upward toward the shoulder 15 by guiding it along the upper vertical groove 22, and thus makes it easy to secure the above-mentioned airway when the body of the outer container 11 is restored and deformed.

[0041] The lower ends of the pair of inclined grooves 21 are connected via the lower ends of the upper vertical groove 22, and the lower end of the upper vertical groove 22 straddles the lower ends of the pair of inclined grooves 21 in the vertical direction, so that the above-mentioned peeling that occurs starting from the valley portion of the body 16 can be prevented from spreading, for example, in the circumferential direction, and can be made to reliably progress upward toward the shoulder 15 side.

[0042] A plurality of lower vertical grooves 23 extending in the up-down direction are provided at intervals in the circumferential direction in the lower part of the body part 16, so that when the part of the body part 16 located below the upper part is pressed radially inward and then this pressing is released, the body part of the outer container 11 can be smoothly restored and deformed.

[0043] Since the upper ends of the multiple lower vertical grooves 23 are located higher the further away they are from the lower ends of the inclined grooves 21 in the circumferential direction, it is easier to smoothly restore and deform the entire body of the outer container 11 that is located below the inclined grooves 21 after the aforementioned pressure is released.

[0044] The body 16 extends radially outward from top to bottom, and the maximum diameter of the shoulder 15 is smaller than the diameter of the portion of the body 16 located below the upper end, making the shoulder 15 less likely to stretch during blow molding of the double container 1. Therefore, when the body 16 is pressed radially inward and then this pressure is released to restore and deform the body of the outer container 11, the inner container 12 is particularly less likely to peel from the outer container 11 at the small-diameter shoulder 15. This significantly achieves the aforementioned effect of preventing the inner container 12 from becoming less likely to peel from the outer container 11 at the shoulder 15 when the body of the outer container 11 is restored and deformed.

[0045] 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.

[0046] For example, the body 16 may extend straight in the vertical direction. The first upper longitudinal groove 22, the lower longitudinal groove 23, and the second upper longitudinal groove 24 may not be provided.

[0047] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and the above-described variations may be combined as appropriate. [Explanation of symbols]

[0048] 1 double container 11 Outer container 12 Inner container 13 Mouth 14 Bottom 15 Shoulder 16 Torso 17. Outside air intake 21 Slant groove 22 First upper vertical groove (upper vertical groove) 23 Lower vertical groove O Bottle stem

Claims

1. The bottle comprises an inner container that shrinks and deforms as the contents stored therein decrease, and an outer container in which the inner container is housed, and the bottle has a mouth, a shoulder, a body, and a bottom, which are arranged in this order from top to bottom along the bottle axis; an air inlet hole is provided in the opening portion to introduce air between the outer container and the inner container as the contents decrease; At least a body portion of the outer container is formed to be elastically deformable, a plurality of pairs of V-shaped inclined grooves that point downward when viewed from the outside in the radial direction are provided along the circumferential direction on the upper part of the body of each of the outer container and the inner container; an upper vertical groove extending in the up-down direction is provided in the upper portion of each of the bodies of the outer container and the inner container at the same circumferential position as the lower ends of the pair of inclined grooves; A double container, wherein the lower ends of the pair of inclined grooves are connected via the lower end of the upper vertical groove.

2. A double container as described in Claim 1, wherein the lower end of the upper vertical groove straddles the lower ends of the pair of inclined grooves in the vertical direction.

3. The bottle comprises an inner container that shrinks and deforms as the contents stored therein decrease, and an outer container in which the inner container is housed, and the bottle has a mouth, a shoulder, a body, and a bottom, which are arranged in this order from top to bottom along the bottle axis; an air inlet hole is provided in the opening portion to introduce air between the outer container and the inner container as the contents decrease; At least a body portion of the outer container is formed to be elastically deformable, a plurality of pairs of V-shaped inclined grooves that point downward when viewed from the outside in the radial direction are provided along the circumferential direction on the upper part of the body of each of the outer container and the inner container; a plurality of vertically extending lower longitudinal grooves are provided at intervals in the circumferential direction on the lower part of the body of each of the outer container and the inner container; A double container, wherein the upper ends of the plurality of lower longitudinal grooves are located higher in the circumferential direction relative to the lower ends of the inclined grooves.

4. The double container according to claim 1 , wherein the body portion extends radially outward from the top to the bottom.

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