Double container

Abstract

To suppress generation of creaking sound and wrinkling when a trunk part is elastically deformed toward the inside in the radial direction thereof.SOLUTION: A double container includes: an inner container 12 generating volume-reducing deformation with reduction in the number of contents to be stored; an outer container 11 with the inner container inner-packaged; a mouth part 13, trunk part 16 and a bottom part 14 arranged in this order toward downward from upward along a bottle axis O direction; and an outside air introduction hole 17 for introducing outside air between the outer container and the inner container with reduction in the number of contents. At least trunk part of the outer container is formed to be elastically deformed, and each trunk part of the outer container and the inner container is provided with a plurality of inclined rib 21 extending in the first direction inclined in the bottle axial direction and peripheral direction when viewed from the outside in the radial direction, which is provided at some interval in a second direction orthogonal to the first direction when viewed from the outside in the radial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dual 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 reduces in volume as the contained contents decrease, and an outer container within which the inner container is placed, with the mouth, body, and bottom arranged in that order from top to bottom along the bottle axial direction, and with an outside air inlet hole which introduces outside air between the outer container and the inner container as the contents decrease. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-30614 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional double container, when the body elastically deforms radially inward, the outer peripheral surface of the inner container comes into close contact with the inner peripheral surface of the outer container, and the inner peripheral surface of the outer container and the outer peripheral surface of the inner container rub against each other, which may cause a squeaking noise. In this case, there is also a risk of wrinkles occurring in the outer container and the inner container.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a double container that can suppress the generation of creaking noises and wrinkles when the body is elastically deformed radially inward. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention employs the following means. That is, the double container of the present invention comprises an inner container which undergoes volume reduction deformation as the contained contents decrease, and an outer container in which the inner container is housed, and the mouth, body, and bottom are arranged in this order from top to bottom along the bottle axial direction, and an outside air introduction hole is provided for introducing outside air between the outer container and the inner container as the contents decrease, at least the body of the outer container is formed to be elastically deformable, and each body of the outer container and the inner container is provided with a plurality of inclined ribs extending in a first direction inclined in the bottle axial direction and circumferential direction as viewed from the outside in the radial direction, and the inclined ribs are provided at intervals in a second direction perpendicular to the first direction as viewed from the outside in the radial direction, the diameter of an upper portion of the body on the mouth side is smaller than the diameter of a lower portion of the bottom side, the inclined ribs are formed across the upper and lower portions of the body, the body extends radially outward as it goes from top to bottom, and the upper portion of the body presents a curved shape recessed radially inward in a vertical cross-sectional view along the bottle axis. The body portion is formed with a plurality of vertical ribs extending in the bottle axial direction at intervals in the circumferential direction, and the inclined rib is divided into the vertical ribs. .

[0007] In the present invention, the body of each of the outer container and the inner container is provided with a plurality of inclined ribs extending in a first direction inclined in the bottle axial direction and circumferential direction as viewed from the outside in the radial direction, spaced apart in a second direction perpendicular to the first direction, so that when the body is elastically deformed toward the inside in the radial direction, the inclined ribs widen, making it easier to stretch the body in the second direction. Therefore, during this elastic deformation, it is possible to suppress the occurrence of wrinkles in the outer container and the inner container, and it is easy to generate a starting point of peeling between the inner circumferential surface of the outer container and the outer circumferential surface of the inner container, and it is possible to suppress the inner container from becoming one with the deformation of the outer container in a predetermined area of ​​the body that is pressed toward the inside in the radial direction. This makes it possible to suppress the inner circumferential surface of the outer container and the outer circumferential surface of the inner container from rubbing against each other when the body is elastically deformed toward the inside in the radial direction, thereby suppressing the occurrence of squeaking noise. Since the diameter of the upper part of the body is smaller than the diameter of the lower part of the body, ground contact stability can be improved, and even if the upper part of the body, which has higher rigidity than the lower part, is pressed radially inward, the inclined rib can be widened to make it easier to stretch the upper part of the body in the second direction, effectively suppressing the occurrence of creaking noises and wrinkles. In the body portion, an inclined rib is provided in the pressed portion located between adjacent vertical ribs in the circumferential direction and pressed radially inward, thereby ensuring the above-mentioned functional effects. Effect of the Invention

[0012] According to this invention, it is possible to suppress the occurrence of creaking noises and wrinkles when the body portion is elastically deformed radially inward. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a side view including a partial vertical cross section of a double container shown as one embodiment, as viewed from the outside in the radial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a double container according to one embodiment will be described with reference to the drawings. 1, the double container 1 includes an inner container 12 that undergoes volume reduction deformation as the contained contents decrease, and an outer container 11 in which the inner container 12 is placed. The outer surface of the inner container 12 is provided so as to be separable from the inner surface of the outer container 11. In the example shown, the inner container 12 is highly flexible and is laminated on the inner surface of the outer container 11 in a manner that allows it to be peeled off. A gap may be provided between the inner surface of the outer container 11 and the outer surface of the inner container 12.

[0015] The double container 1 is formed by integrally blow molding the outer preform and the inner preform in a state where the inner preform for forming the inner container 12 is fitted into the outer preform for forming the outer container 11. In other words, the double container 1 is a biaxially stretched blow container.

[0016] 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).

[0017] 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, with the mouth 13 side along the bottle axis O being referred to as the upper side, and the bottom 14 side along the bottle axis O being referred to as the lower side. When viewed from the bottle axis O direction, the direction intersecting the bottle axis O will be referred to as the radial direction, and the direction going around the bottle axis O will be referred to as the circumferential direction.

[0018] 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.

[0019] The size of the double container 1 in the bottle axis O direction is, for example, 115 mm or more and 220 mm or less. The capacity of the double container 1 is, for example, 150 ml or more and 600 ml or less. In the illustrated example, the size of the double container 1 in the bottle axis O direction is about 150 mm, and the double container 1 is for a capacity of 200 ml. The double container 1 has a circular shape in a cross section perpendicular to the bottle axis O over the entire length in the bottle axis O direction.

[0020] A flange portion 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 portion 12a is placed on the upper opening edge of the mouth of the outer container 11. On the outer peripheral surface of the mouth of the outer container 11, there are formed, in this order from top to bottom, a male threaded portion 18 onto which a cap (not shown) is screwed, a sealed protrusion 19 onto which the peripheral wall portion of the cap (not shown) is fitted, and a neck ring 20.

[0021] The sealed projection 19 and the neck ring 20 project radially outward from the mouth of the outer container 11 and extend continuously over the entire circumferential length. An airtight seal is formed between the outer peripheral surface of the sealed projection 19 and the inner peripheral surface of the peripheral wall of the cap (not shown). The neck ring 20 is provided at the lower end of the mouth of the outer container 11. The outer diameter of the neck ring 20 is larger than the outer diameter of the sealed 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 undercut fitting.

[0022] An outside air introduction hole 17 is formed at the mouth of the outer container 11 to introduce outside air between the outer container 11 and the inner container 12 as the content decreases. The outside air introduction hole 17 is located at the radially outermost part of the sealed protrusion 19, and is located above the sealing surface that extends continuously over the entire circumferential length. The position where the outside air introduction hole 17 is formed is not limited to the mouth of the outer container 11, but may be, for example, the body, shoulder, or bottom of the outer container 11 other than the mouth, or may be between the upper opening edge of the mouth of the outer container 11 and the underside of the flange portion 12a of the inner container 12, etc.

[0023] The shoulder portion 15 extends radially outward from the lower end of the mouth portion 13 downward. The bottom portion 14 is formed in a cylindrical shape with a bottom. A peripheral wall portion 14b of the bottom portion 14 extends radially inward as it extends downward.

[0024] The diameter of the upper part of the body 16 on the mouth 13 side is smaller than the diameter of the lower part on the bottom 14 side. The body 16 extends radially outward from the top to the bottom. The upper part of the body 16 has a curved shape recessed radially inward in a vertical cross section along the bottle axis O. The upper part of the body 16 may have a straight 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 is the maximum outer diameter portion of the double container 1. The outer diameter of this maximum outer diameter portion is, for example, 58 mm or more and 74 mm or less. In the illustrated example, the outer diameter of the maximum outer diameter portion of the double container 1 is approximately 63 mm.

[0025] A plurality of vertical ribs 22 extending in the direction of the bottle axis O are formed at intervals in the circumferential direction on the body 16. The vertical ribs 22 are integrally formed from the connection between the mouth 13 and the shoulder 15 through the shoulder 15 to the lower end of the body 16. The vertical ribs 22 extend straight in the direction of the bottle axis O. The vertical ribs 22 are ridges protruding radially outward or grooves recessed radially inward. The lower end of the vertical ribs 22 is located above the maximum outer diameter portion of the double container 1.

[0026] It is not necessary to provide the vertical rib 22. The vertical rib 22 may be provided only on the body portion 16, not on the shoulder portion 15, etc. The vertical rib 22 may have, for example, a curved configuration when viewed from the outside in the radial direction.

[0027] The vertical rib 22 is located radially inward from the maximum outer diameter portion of the double container 1 . This makes it possible to prevent damage such as tears to the labels attached to the double containers 1 caused by vibrations or the like, for example, when transporting a carton containing multiple double containers 1.

[0028] 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, the shoulder 15, and the bottom 14 are connected without any steps in the bottle axis O direction.

[0029] In this embodiment, each body portion of the outer container 11 and the inner container 12 is provided with a plurality of inclined ribs 21 extending in a first direction inclined in the direction of the bottle axis O and the circumferential direction when viewed from the outside in the radial direction, and spaced apart in a second direction perpendicular to the first direction when viewed from the outside in the radial direction.

[0030] The inclined rib 21 extends straight in the first direction. The inclined rib 21 is a protrusion protruding radially outward, or a groove recessed radially inward. The multiple inclined ribs 21 all extend in the same direction when viewed from the outside in the radial direction. The width of the inclined rib 21 is narrower than the width of the vertical rib 22. The width and pitch interval of the inclined ribs 21 are set so that three or more inclined ribs 21 are pressed by one fingertip when the body portion 16 is pressed radially inward.

[0031] The inclined rib 21 is integrally formed across the upper and lower parts of the body portion 16 . The lower end of the inclined rib 21 is located above the maximum outer diameter portion of the double container 1. The lower end of the inclined rib 21 is located below the vertical rib 22. The upper end of the inclined rib 21 is located at the upper end of the body portion 16. The radial size at the lower end of the inclined rib 21 decreases as it goes downward along the first direction. The radial size at the upper end of the inclined rib 21 decreases as it goes upward along the first direction.

[0032] The inclined rib 21 is divided into vertical ribs 22 . Of the inclined rib 21, the divided portion divided by the vertical rib 22 is separated in the first direction from the vertical rib 22. Of the inclined rib 21, the radial size of the divided portion becomes smaller as it approaches the vertical rib 22 dividing the inclined rib 21 in the first direction. In the inclined rib 21, each divided portion sandwiching the vertical rib 22 in the first direction may be located on the same line extending in the first direction when viewed from the radial outside, or may be positioned offset from the same line extending in the first direction.

[0033] As described above, according to the double container 1 of this embodiment, the body of each of the outer container 11 and the inner container 12 has a plurality of inclined ribs 21 extending in a first direction inclined in the direction of the bottle axis O and the circumferential direction when viewed from the outside in the radial direction, and the inclined ribs 21 are spaced apart in a second direction perpendicular to the first direction, so that when the body 16 is elastically deformed toward the inside in the radial direction, the inclined ribs 21 widen, making it easier to stretch the body 16 in the second direction. Therefore, during this elastic deformation, it is possible to suppress the occurrence of wrinkles in the outer container 11 and the inner container 12, and it is easy to generate a starting point of peeling between the inner circumferential surface of the outer container 11 and the outer circumferential surface of the inner container 12, and it is possible to suppress the inner container 12 from becoming one with the deformation of the outer container 11 in a predetermined region of the body 16 pressed toward the inside in the radial direction. This makes it possible to prevent the inner surface of the outer container 11 and the outer surface of the inner container 12 from rubbing against each other when the body 16 is elastically deformed radially inward, thereby suppressing the generation of squeaking noises.

[0034] In the body portion 16, the inclined rib 21 is provided in the pressed portion located between adjacent vertical ribs 22 in the circumferential direction and pressed radially inward, thereby ensuring the above-mentioned functional effect.

[0035] Since the diameter of the upper part of the body 16 is smaller than the diameter of the lower part of the body 16, ground contact stability can be improved, and even if the upper part of the body 16, which has higher rigidity than the lower part, is pressed radially inward, the upper part of the body 16 can be easily stretched in the second direction by widening the inclined rib 21, thereby effectively suppressing the occurrence of creaking noises and wrinkles.

[0036] 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.

[0037] For example, the body 16 may have a configuration in which a plurality of surfaces are connected in the circumferential direction via corners, and the vertical ribs 22 may be provided at the corners. In this case, vertical ribs 22 are provided at the corners of the body 16, which have high rigidity, thereby further increasing the rigidity of the corners. Therefore, when the body 16 is elastically deformed radially inward, the portions of the body 16 located between adjacent vertical ribs 22 in the circumferential direction are reliably pressed. The body 16 may extend straight in the direction of the bottle axis O, for example.

[0038] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described embodiments and the above-described variations may be combined as appropriate. [Explanation of symbols]

[0039] 1 double container 11 Outer container 12 Inner container 13 Mouth 14 Bottom 16 Torso 17. Outside air intake 21 Inclined Rib 22 Vertical ribs O Bottle stem

Claims

[Claim 1] The bottle has an inner container that reduces in volume as the amount of content contained therein decreases, and an outer container in which the inner container is housed, and the bottle has a mouth, a body, and a bottom that are arranged in this order from top to bottom along the bottle axial direction; an outside air introduction hole for introducing outside air between the outer container and the inner container as the content decreases; At least a body portion of the outer container is formed to be elastically deformable, A plurality of inclined ribs extending in a first direction inclined in the bottle axial direction and the circumferential direction as viewed from the outside in the radial direction are provided on each body portion of the outer container and the inner container at intervals in a second direction perpendicular to the first direction as viewed from the outside in the radial direction, The diameter of the upper part of the body on the mouth side is smaller than the diameter of the lower part of the body on the bottom side, The inclined rib is formed across the upper and lower parts of the body portion, The body portion extends radially outward from the top to the bottom, The upper part of the body has a curved shape recessed radially inward when viewed in a vertical cross section along the bottle axis, A plurality of vertical ribs extending in the bottle axial direction are formed on the body portion at intervals in the circumferential direction, The inclined rib is separated by the longitudinal rib.

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