Double container

Abstract

To provide a double container, which is configured so that broken lines are suppressed from being generated in a squeeze area and in a portion adjacent to the area, when the squeeze area is pressed toward inside in a radial direction thereof.SOLUTION: A double container comprises an inner container 12 that is reduced in volume and deformed as stored contents decrease and an outer container 11 in which the inner container is interiorly arranged, and also comprises an outdoor air introduction hole 17 through which outdoor air is introduced to a space between the outer container and the inner container as the contents decrease. A squeeze area 16c, which includes a center portion in a container shaft O-direction in a trunk part and a trunk part of the outer container formed to be elastically deformable, set in the trunk part. The squeeze area comprises inclined parts 21 and 22 positioned at both end parts in the container shaft direction, a diameter reduced part 23 positioned between the inclined parts, and step parts 24 and 25 through which the inclined parts and the diameter reduced part are connected to each other. The inclined parts extend toward inside in the radial direction as going along the container shaft direction toward the diameter reduced part.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, there has been known a double container which includes an inner container that reduces in volume as the contained contents decrease, and an outer container within which the inner container is placed, and which has a mouth, body, and bottom arranged in that order from top to bottom along the axial direction of the container, and which has an outside air inlet hole for introducing outside air between the outer container and the inner container as the contents decrease, and in which at least the body of the outer container is formed to be elastically deformable. When pouring out the contents, the user presses a squeeze region of the body, which includes the central part of the body in the axial direction of the container and the body of the outer container, which is formed to be elastically deformable, radially inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-18892 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the squeeze area is compressed radially inward, fold lines may occur in the squeeze area and adjacent portions.

[0005] The present invention provides a double container that can suppress the formation of creases in the squeeze area and its adjacent portions when the squeeze area is pressed radially inward. [Means for solving the problem]

[0006] A double container according to one embodiment of the present invention comprises an inner container that undergoes volumetric deformation as the contained contents decrease, and an outer container in which the inner container is housed, and has a mouth, a body, and a bottom arranged in this order from top to bottom along the container axial direction, and an outside air inlet hole 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 the body is provided with a squeeze region including a central portion of the body in the container axial direction and the body of the outer container formed to be elastically deformable, and the squeeze region comprises inclined portions located at both ends in the container axial direction, a reduced diameter portion located between the inclined portions, and a step portion connecting the inclined portions and the reduced diameter portion to each other, and the inclined portions extend radially inward along the container axial direction toward the reduced diameter portion.

[0007] Since the squeeze region includes an inclined portion, a reduced diameter portion, and a step portion, when the reduced diameter portion is gripped and pressed radially inward, the step portion can suppress the deformations of the reduced diameter portion and the inclined portion from influencing each other, and the reduced diameter portion and the inclined portion can be smoothly elastically deformed over their entire areas in response to an applied external force. This makes it possible to suppress the occurrence of fold lines in the squeeze region and its adjacent portions when the squeeze region is pressed radially inward.

[0008] The inclined portion may have a plurality of first longitudinal grooves recessed radially inward and extending in an axial direction of the container, the first longitudinal grooves being spaced apart in the circumferential direction over the entire circumferential length.

[0009] The inclined portion has a plurality of first vertical grooves that are recessed radially inward and extend in the axial direction of the container, spaced circumferentially over the entire circumferential length. This makes it easier to elastically deform the inclined portion when the reduced diameter portion is pressed radially inward, and also makes it easier for tiny gaps to form between the inner surface of the outer container and the outer surface of the inner container in the inclined portion, making it easier to separate the inner surface of the outer container after it has restored its shape from the outer surface of the inner container.

[0010] The reduced diameter portion may have a plurality of second vertical groove portions recessed radially inward and extending in the container axial direction, spaced circumferentially along the entire circumferential length, the depth of the second vertical groove portions being greater than the depth of the first vertical groove portions, and the width of the second vertical groove portions being greater than the width of the first vertical groove portions.

[0011] Since a second longitudinal groove portion that is deeper than the depth of the first longitudinal groove portion and wider than the width of the first longitudinal groove portion is formed in the reduced diameter portion, when the reduced diameter portion is pressed radially inward, the occurrence of a circumferentially extending fold line in the reduced diameter portion can be suppressed. Effect of the Invention

[0012] According to the above aspect of the present invention, when the squeeze region is pressed radially inward, it is possible to suppress the occurrence of fold lines in the squeeze region and its adjacent portions. [Brief description of the drawings]

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

[0014] Hereinafter, a double container according to one embodiment of the present invention will be described with reference to the drawings. 1, the double container 1 according to this embodiment includes an inner container 12 that undergoes volume reduction deformation as the contained contents decrease, and an outer container 11 in which the inner container 12 is housed. The outer surface of the inner container 12 is provided so as to be separable from the inner surface of the outer container 11. In the example shown in the figure, 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 in this order coaxially with a common axis. Hereinafter, this common axis will be referred to as the container axis O, the side of the mouth 13 of the double container 1 along the container axis O will be referred to as the upper side, and the side of the bottom 14 of the double container 1 will be referred to as the lower side. The direction intersecting the container axis O as viewed from the container axis O direction will be referred to as the radial direction, and the direction going around the container axis O as viewed from the container axis O direction 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 direction of the container axis O is, for example, 115 mm or more and 220 mm or less. The capacity of the double container 1 is, for example, 150 ml or more and 600 ml or less. In the illustrated example, the size of the double container 1 in the direction of the container axis O is about 180 mm, and the double container 1 is for a capacity of 300 ml. The mouth 13 of the double container 1 is formed in a cylindrical shape extending upward from the upper end of the shoulder portion 15 . A flange portion that protrudes radially outward and extends continuously over the entire circumferential length is formed at the upper end of the mouth of the inner container 12. The flange portion is placed on the upper opening edge of the mouth of the outer container 11.

[0020] A male threaded portion 18 to which a cap (not shown) is screwed, and a sealed protrusion 19 to which a peripheral wall portion of the cap (not shown) is fitted are formed from top to bottom on the outer peripheral surface of the mouth of the outer container 11. The sealed protrusion 19 protrudes radially outward from the mouth of the outer container 11 and extends continuously over the entire circumferential length. An airtight seal is formed between the outer peripheral surface of the sealed protrusion 19 and the inner peripheral surface of the peripheral wall portion of the cap (not shown). The cap may be fitted to the mouth of the outer container 11 by undercut fitting.

[0021] 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 of the mouth of the inner container 12, etc.

[0022] The shoulder portion 15 extends radially outward as it goes downward from the lower end of the mouth portion 13. A plurality of vertical partition grooves 15a are formed at intervals in the circumferential direction in the shoulder portion 15. The shoulder portion 15 has a curved shape that protrudes radially outward in a vertical cross-sectional view along the container axis O. The bottom portion 14 is formed in a cylindrical shape with a bottom. The peripheral wall portion of the bottom portion 14 extends radially inward from the top to the bottom.

[0023] The upper end 16a and the lower part 16b of the body 16 extend straight in the direction of the container axis O. The outer peripheral surfaces of the upper end 16a and the lower part 16b form the maximum outer diameter part of the double container 1. The outer diameter of this maximum outer diameter part is, for example, 58 mm or more and 74 mm or less. In the illustrated example, the outer diameter of the maximum outer diameter part of the double container 1 is about 66 mm.

[0024] Of the body portion 16, the size of the upper end portion 16a in the direction of the container axis O is smaller than the size of the lower portion 16b in the direction of the container axis O. A circumferential groove 16f is formed on the outer circumferential surface of the lower portion 16b of the body portion 16, extending continuously over the entire circumferential length. Of the body 16, the size in the container axis O direction of an intermediate portion (squeezed region) 16c located between the upper end portion 16a and the lower portion 16b is larger than the size in the container axis O direction of the lower portion 16b. Both ends of the intermediate portion 16c in the container axis O direction are connected to the upper end portion 16a and the lower portion 16b without any step in the container axis O direction.

[0025] The intermediate portion 16c of the body portion 16 includes a central portion of the body portion 16 in the direction of the container axis O. At least the intermediate portion (body portion) of the outer container 11 is formed to be elastically deformable. The intermediate portion 16c of the body portion 16 includes inclined portions 21 and 22, a reduced diameter portion 23, an upper stage portion (step portion) 24, and a lower stage portion (step portion) 25.

[0026] The inclined portions 21, 22 are located at both ends in the direction of the container axis O of the middle portion 16c of the body portion 16. The inclined portions 21, 22 extend radially inward toward the reduced diameter portion 23 along the direction of the container axis O. Hereinafter, of the inclined portions 21 and 22, the one located at the upper end of the middle portion 16c of the body portion 16 will be referred to as the upper inclined portion 21, and the one located at the lower end of the middle portion 16c of the body portion 16 will be referred to as the lower inclined portion 22.

[0027] In a vertical cross-sectional view along the container axis O, the length of the upper inclined portion 21 is shorter than the length of the lower inclined portion 22. The inclination angle of the upper inclined portion 21 with respect to the container axis O is larger than the inclination angle of the lower inclined portion 22 with respect to the container axis O. In the vertical cross-sectional view, the upper inclined portion 21 and the lower inclined portion 22 each have a curved shape that is concave radially inward. The upper inclined portion 21 and the lower inclined portion 22 may have the same inclination angle with respect to the container axis O. Furthermore, the upper inclined portion 21 and the lower inclined portion 22 may each extend linearly when viewed in the vertical cross section.

[0028] The reduced diameter portion 23 is located between the upper inclined portion 21 and the lower inclined portion 22. In a vertical cross-sectional view along the container axis O direction, the length of the reduced diameter portion 23 is longer than the length of the lower inclined portion 22. The reduced diameter portion 23 includes the central portion of the body portion 16 in the container axis O direction. The reduced diameter portion 23 is formed in a constricted shape that extends radially inward as it moves inward from both ends along the container axis O direction. The reduced diameter portion 23 may extend straight in the container axis O direction.

[0029] The upper end of the reduced diameter portion 23 and the upper inclined portion 21 are connected to each other via an upper step portion 24. The lower end of the reduced diameter portion 23 and the lower inclined portion 22 are connected to each other via a lower step portion 25. The upper step portion 24 and the lower step portion 25 each extend radially inward as they move toward the reduced diameter portion 23 along the container axis O. Note that the upper step portion 24 and the lower step portion 25 may extend straight in the radial direction, for example.

[0030] The inclined portions 21, 22 are formed with a plurality of first vertical grooves 16d recessed radially inward and extending in the direction of the container axis O at intervals in the circumferential direction over the entire circumferential length. The first vertical grooves 16d formed in the upper inclined portion 21 and the lower inclined portion 22 are provided at the same position in the circumferential direction. The first vertical grooves 16d are provided over the entire length in the direction of the container axis O of the upper inclined portion 21 and the lower inclined portion 22. The first vertical grooves 16d formed in the upper inclined portion 21 and the lower inclined portion 22 are formed to be the same size except for the length in the direction of the container axis O.

[0031] In the reduced diameter portion 23, a plurality of second longitudinal grooves 16e are formed at intervals in the circumferential direction, recessed radially inward and extending in the direction of the container axis O. The second longitudinal grooves 16e are provided in the reduced diameter portion 23 over the entire length in the direction of the container axis O. The depth of the second longitudinal grooves 16e is greater than the depth of the first longitudinal grooves 16d, and the width of the second longitudinal grooves 16e is greater than the width of the first longitudinal grooves 16d.

[0032] As described above, according to the double container 1 of this embodiment, the intermediate portion 16c of the body portion 16 has an upper inclined portion 21, a lower inclined portion 22, a reduced diameter portion 23, an upper stage portion 24, and a lower stage portion 25. Therefore, when the reduced diameter portion 23 is grasped and pressed radially inward, the upper stage portion 24 and the lower stage portion 25 can suppress the deformation of the reduced diameter portion 23 and the deformation of the upper inclined portion 21 and the lower inclined portion 22 from affecting each other, and the reduced diameter portion 23, the upper inclined portion 21, and the lower inclined portion 22 can be smoothly elastically deformed over their entire areas in response to an applied external force. This makes it possible to prevent the formation of fold lines in the intermediate portion 16c and its adjacent portions, that is, the upper end portion 16a and the lower portion 16b, when the intermediate portion 16c of the body portion 16 is pressed radially inward.

[0033] The upper inclined portion 21 and the lower inclined portion 22 have a plurality of first vertical groove portions 16d that are recessed radially inward and extend in the container axial direction, and are formed at intervals circumferentially over the entire circumferential length. This makes it easier to elastically deform the upper inclined portion 21 and the lower inclined portion 22 when the reduced diameter portion 23 is pressed radially inward, and also makes it easier for tiny gaps to form between the inner surface of the outer container 11 and the outer surface of the inner container 12 in each of the upper inclined portion 21 and the lower inclined portion 22, making it easier to separate the inner surface of the deformed outer container 11 from the outer surface of the inner container 12.

[0034] Since a second vertical groove portion 16e that is deeper than the depth of the first vertical groove portion 16d and wider than the width of the first vertical groove portion 16d is formed in the reduced diameter portion 23, when the reduced diameter portion 23 is pressed radially inward, the occurrence of a circumferentially extending fold line in the reduced diameter portion 23 can be suppressed.

[0035] 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.

[0036] The inclined portions 21 and 22 do not necessarily need to have the first vertical grooves 16d. The reduced diameter portion 23 does not necessarily need to have the second vertical groove 16e.

[0037] 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]

[0038] 1 double container 11 Outer container 12 Inner container 13 Mouth 14 Bottom 16 Torso 16c Middle part (squeeze area) 16d 1st vertical groove 16e 2nd vertical groove 17. Outside air intake 21 and 22 inclined portions 23 reduced diameter portion 24 upper stage portion (stepped portion) 25 lower stage portion (stepped portion) O container axis

Claims

1. The container has an inner container that undergoes volume reduction deformation as the amount of content contained therein decreases, and an outer container in which the inner container is housed, and the container has a mouth, a body, and a bottom that are arranged in this order from top to bottom along an axial direction of the container, 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, The body portion is provided with a squeeze region including a central portion of the body portion in a container axial direction and a body portion of the outer container formed to be elastically deformable, The squeeze region is Inclined portions located at both ends in the container axial direction; a reduced diameter portion located between the inclined portions; a step portion connecting the inclined portion and the reduced diameter portion to each other, The inclined portion extends radially inwardly along the container axial direction toward the reduced diameter portion.

2. The double container as described in claim 1, wherein the inclined portion has a plurality of first vertical grooves that are recessed radially inward and extend in the container axial direction, and are formed at intervals circumferentially along the entire circumferential length.

3. The reduced diameter portion has a plurality of second longitudinal grooves recessed radially inward and extending in the container axial direction, the second longitudinal grooves being spaced apart from one another along the entire circumferential length of the reduced diameter portion, 3. The double container according to claim 2, wherein the second longitudinal groove portion has a depth greater than a depth of the first longitudinal groove portion, and the second longitudinal groove portion has a width greater than a width of the first longitudinal groove portion.

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