JP2018002235A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container which can suppress crack of a holding rib.SOLUTION: A double container 1 comprises: an inner container 2 which is deformed in volume-reduction, following to reduction of a content, and which stores the content; and an outer container 3 in which the inner container is packaged. A bottom wall part of the outer container has; a ground part 21 which is positioned on an outer peripheral part; a caving recess 22 which is continuous to the ground part from inside of a radial direction and becomes hollow to inside of a container shaft O direction; and a holding rib 23 which is arranged on the caving recess, and sandwiches the inner container and outer container and holds them in an integrated manner. The ground part has plural swollen parts 25, 26, 27 which are swollen to outside of the container shaft direction, along the peripheral direction around the container shaft.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double container.

  2. Description of the Related Art Conventionally, as shown in, for example, Patent Document 1, a double container including an inner container that accommodates contents and is reduced in volume as the contents are reduced, and an outer container in which the inner container is built is known. ing. In this type of double container, generally, a bottom wall portion of the outer container, a grounding portion located on the outer peripheral portion, a grounded portion that is continuous from the inside in the radial direction, and a recessed portion that is recessed inward in the container axial direction, A holding rib (bottom seal portion) that is disposed in the recess and holds the inner container and the outer container in an integrated manner is formed.

By fixing the inner container to the outer container with the holding rib, for example, when the contents stored in the inner container are discharged by squeezing (elastically deforming) the outer container, the inner container is appropriately reduced in volume and deformed. It is possible to suppress the contents from remaining in the inner container.
Note that the contents can be discharged by simply tilting the double container without squeezing the outer container.

Japanese Patent No. 5917368

However, in the conventional double container, when the impact force is applied to the bottom wall portion of the outer container due to dropping or the like, the holding rib may be broken. In particular, when the outer container is formed of a relatively hard resin material, the holding rib is easily broken compared to the case of forming the outer container from a relatively soft resin material.
Also, an air valve is formed in the mouth portion of the outer container so as to open an outside air inflow gap between the outer container and the inner container, and the communication between the outside through the air intake hole and the outside air inflow gap is switched between and shut off. A double container comprising is known. In this type of double container, if the holding rib breaks, the air in the outside air inflow gap flows out through the cracking of the holding rib even if the outer container is squeezed. For this reason, it becomes difficult to reduce the volume of the inner container.

  This invention is made | formed in view of such a problem, Comprising: It aims at providing the double container which can suppress that a holding rib breaks.

In order to solve the above problems, the present invention proposes the following means.
The double container of the present invention is a double container comprising an inner container that accommodates the contents and is reduced in volume as the contents are reduced, and an outer container in which the inner container is installed, and the outer container A bottom wall portion of the inner container, a grounding portion located in an outer peripheral portion, a recessed portion that is continuous with the grounding portion from a radially inner side and that is recessed inward in a container axial direction, and the inner container is disposed in the recessed portion. And a holding rib that sandwiches and holds the outer container integrally, and a bulging portion that bulges outward in the container axial direction is formed in the grounding portion in a circumferential direction around the container axis. It is characterized in that a plurality are formed along the line.

  In this case, since a plurality of bulging portions are formed in the grounding portion of the bottom wall portion, the grounding portion can be provided with flexibility. Therefore, even when an impact force is applied to the grounding portion of the outer container, for example, when the double container falls in an upright posture, the impact force is received by the plurality of bulge portions, and the plurality of bulge portions Is deformed and dispersed and absorbed in the circumferential direction, and is not easily transmitted to the holding rib. Therefore, the holding rib can be prevented from cracking.

Each said bulging part may be formed in the curved surface shape which protrudes toward the outer side of the said container axial direction.
In this case, the flexibility of the grounding portion can be improved reliably, and the occurrence of a portion where a large load is locally applied to the bulging portion can be suppressed.

The plurality of bulging portions may be arranged to be connected to the grounding portion in the circumferential direction.
In this case, the bulging portions adjacent to each other in the circumferential direction support each other in the circumferential direction, and it is possible to suppress a decrease in grounding stability due to the formation of the bulging portion in the grounding portion.

The plurality of bulging portions may be arranged such that a maximum circumferential length portion having a maximum circumferential length in each of the bulging portions is located on the same circle with the container axis as a center. .
In this case, the impact force applied to the grounding portion can be received by the plurality of bulging portions with less deviation over the entire circumference, and a decrease in grounding stability can be reliably suppressed.

The circumferential lengths of the maximum circumferential length portions of the respective bulging portions may be equal to each other.
In this case, the impact force can be reliably dispersed and absorbed by the plurality of bulging portions regardless of the circumferential position of the grounding portion that receives the impact force.

  According to the double container of the present invention, the holding rib can be prevented from cracking.

It is the side view which fractured | ruptured one part which shows one Embodiment of the double container which concerns on this invention. It is a bottom view of the double container. It is an A direction arrow directional view in FIG.

Hereinafter, an embodiment of a double container according to the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the double container 1 of the present embodiment includes an inner container 2 in which contents (not shown) are accommodated, and an outer container 3 in which the inner container 2 is housed. In the illustrated example, the double container 1 is a delamination bottle (laminated peelable container) in which the inner container 2 is detachably laminated on the inner surface of the outer container 3.
The inner container 2 is formed of a highly flexible material that undergoes volumetric deformation (squeezing deformation) as the contents decrease. The outer container 3 is formed to be squeezable (elastically deformable).

  The inner container 2 and the outer container 3 are, for example, polyester resins such as polyethylene terephthalate resin and polyethylene naphthalate resin, polyolefin resins such as polyethylene resin and polypropylene resin, polyamide resins such as nylon, or ethylene vinyl alcohol copolymer. Using a resin or the like, the inner container 2 and the outer container 3 can be formed in a combination that allows separation (low compatibility).

  In the double container 1, a mouth part 10, a body part 11, and a bottom part 12 are connected in this order along the container axis O direction. In this embodiment, the mouth 10 side is referred to as the upper side and the bottom 12 side is referred to as the lower side along the container axis O. In a plan view of the double container 1 as viewed from the container axis O direction, a direction intersecting (orthogonal) with the container axis O is referred to as a radial direction, and a direction around the container axis O is referred to as a circumferential direction.

A pair of rib groups 14 is provided in a portion of the body portion 11 constituting the outer container 3 (one rib group 14 is not shown). Each rib group 14 is formed so as to sandwich the container axis O in the radial direction. Since the configuration of each rib group 14 is basically the same as each other, only one rib group 14 will be described below.
The rib group 14 includes a plurality of concave grooves 15 that extend from the upper side to the lower side and are arranged side by side in the circumferential direction. The plurality of concave grooves 15 are formed on the outer peripheral surface of the outer container 3. On the inner peripheral surface of the outer container 3, convex lines (not shown) corresponding to the concave grooves 15 are formed.
A gap (not shown) is provided between the portion of the inner peripheral surface of the outer container 3 where the ridges are located and the outer peripheral surface of the inner container 2. By comprising in this way, the inner container 2 becomes easy to peel from the outer container 3.

The body portion 11 is provided with a fixing portion (not shown) that adheres the inner container 2 to the outer container 3 so as not to be peeled off. The adhering portion is formed in a belt shape extending in the container axis O direction over the entire length of the body portion 11, and adhering parts of the outer container 3 and the inner container 2 in the circumferential direction to each other.
In addition, at least the trunk | drum part located in the trunk | drum 11 among the outer containers 3 can be elastically deformed toward the inner side of radial direction.

The mouth portion 10 extends upward from the upper end opening of the trunk portion 11 and is disposed coaxially with the trunk portion 11. An opening 2 a is formed on the upper side of the portion constituting the inner container 2 in the mouth portion 10.
On the outer peripheral surface of the portion constituting the outer container 3 in the mouth portion 10, a pair of male screw portions 17 and a pair of male screw portions 17 are located below the male screw portion 17 and sucks outside air between the outer container 3 and the inner container 2. An intake hole 18 is formed (one intake hole 18 is not shown). The pair of intake holes 18 are arranged so as to sandwich the container axis O in the radial direction. Each intake hole 18 communicates with an outside air inflow gap between the outer container 3 and the inner container 2.

  Although not shown, the double container 1 is used in a state in which a discharge cap including an air valve for switching communication between the outside through the intake hole 18 and the outside air inflow gap and switching between the two is closed to the mouth portion 10.

  As shown in FIGS. 1 and 2, the bottom 12 is connected to the body 11 and closes the lower end opening of the body 11. The bottom wall portion of the outer container 3 in the bottom portion 12 includes a grounding portion 21 located on the outer peripheral portion, a recessed recess 22 that is continuous with the grounding portion 21 from the inside in the radial direction and is recessed upward (inside in the container axis O direction). A holding rib 23 (bottom seal portion) disposed in the recessed recess 22 is formed.

As shown in FIGS. 1 to 3, the holding rib 23 extends in a straight line along the parting line of the bottom portion 12 and is formed in a ridge shape facing downward. Although not shown, the holding ribs 23 are formed in a protruding shape by superposing and crimping the inner container 2 and the outer container 3, and have a structure that bites alternately. The holding rib 23 extends from the depressed recess 22 toward the outside in the radial direction and reaches the grounding portion 21.
A plurality of pinning holes 23 a that bite alternately are formed on the front and back surfaces of the holding rib 23. Each pinning hole 23 a does not penetrate the holding rib 23. The number of pinning holes 23a is formed such that the opening directions of the pinning holes 23a adjacent in one direction are alternately reversed.

The grounding portion 21 is arranged coaxially with the container axis O and is formed in an annular shape.
A plurality of bulging portions 25 to 27 that bulge downward (outside in the container axis O direction) are formed in the grounding portion 21 along the circumferential direction around the container axis O. The plurality of bulging portions 25 to 27 include a first bulging portion 25, a second bulging portion 26, and a third bulging portion 27.

Four first bulging portions 25 are arranged, and are arranged separately at positions sandwiching both end portions in one direction of the holding rib 23 in other directions orthogonal to the one direction in the radial direction. And the 1st bulging part 25, the 2nd bulging part 26, and the 3rd bulging part 27 are arrange | positioned in this order in the circumferential direction.
The radial length L2 of the second bulging portion 26 is longer than the radial length L1 of the first bulging portion 25. The radial length L3 of the third bulging portion 27 is longer than the radial length L2 of the second bulging portion 26.

The first to third bulging portions 25 to 27 are arranged so that the respective outer end portions in the radial direction are located on the same circle with the container axis O as the center. The radially inner end of the first bulging portion 25 is located on the outer side in the radial direction with respect to the radially inner end of the second bulging portion 26. The radially inner end portion of the second bulging portion 26 is located on the outer side in the radial direction than the radially inner end portion of the third bulging portion 27.
In the bottom view shown in FIG. 2, the first bulging portion 25 is formed in an elliptical shape that is long in the circumferential direction, and the second bulging portion 26 and the third bulging portion 27 are formed in an elliptical shape that is long in the radial direction. ing.
The 1st-3rd bulging parts 25-27 are formed in the curved surface shape which protruded toward the downward side. The first to third bulge portions 25 to 27 are formed in a hemispherical shell shape having substantially the same thickness.

  As shown in FIGS. 1 to 3, the first to third bulge portions 25 to 27 are arranged to be connected to the grounding portion 21 in the circumferential direction. That is, the 1st-3rd bulging parts 25-27 adjacent to the circumferential direction are arrange | positioned without the clearance gap. Note that both ends in the circumferential direction on the outer peripheral edge of the third bulging portion 27 extend linearly in the radial direction. The connection part with the outer periphery of the 3rd bulging part 27 among the outer periphery of the 2nd bulging part 26 is extended linearly in radial direction.

In the first to third bulge portions 25 to 27, the maximum circumferential length portions 25a to 27a having the maximum circumferential length in the first to third bulge portions 25 to 27 are centered on the container axis O. They are arranged so as to be located on the same circle C. The circumferential length L4 of the maximum circumferential length portion 25a of the first bulging portion 25, the circumferential length L5 of the maximum circumferential length portion 26a of the second bulging portion 26, and the maximum of the third bulging portion 27 The circumferential length L6 of the circumferential length portion 27a is equivalent to (including the same as each other).
The first to third bulge portions 25 to 27 protrude below the holding rib 23.

The double container 1 of the present embodiment configured as described above is manufactured by blow molding. As blow molding, a double container 1 may be formed by forming a double (internal and external) laminated parison by extrusion molding or the like, and blow molding this laminated parison (extrusion blow molding). In addition, a preform for the outer container 3 and a preform for the inner container 2 are formed by injection molding or the like, and these are combined in a double (internal / external) and then biaxially stretched blow molded to form the double container 1. May be formed.
The preform for the outer container 3 is biaxially stretched and blow molded first to form the outer container 3, and then the preform for the inner container 2 is placed inside, and then the preform for the inner container 2 is placed. The double container 1 may be formed by biaxial stretch blow molding.

As described above, according to the double container 1 of the present embodiment, since the plurality of bulged portions 25 to 27 are formed in the grounding portion 21, the grounding portion 21 can be provided with flexibility. Therefore, even when an impact force is applied to the ground contact portion 21 of the outer container 3 such as when the double container 1 falls in an upright posture, the impact force is received by the plurality of bulging portions 25 to 27. . The impact force is dispersed and absorbed in the circumferential direction by deformation of the plurality of bulging portions 25 to 27, and is not easily transmitted to the holding rib 23. Therefore, the holding rib 23 can be prevented from cracking.
For example, when the outer container 3 is formed of a relatively hard resin material such as polypropylene, the holding rib 23 is easily broken when the double container 1 falls in an upright posture. The effect is remarkably successful.

Since the first to third bulge portions 25 to 27 are formed in a curved surface projecting downward, the flexibility of the ground contact portion 21 can be reliably improved, and the first to third bulge portions can be improved. It can suppress that the part to which a big load is locally added to the output parts 25-27 arises.
Since the 1st-3rd bulging parts 25-27 are connected to the grounding part 21 in the circumferential direction, the 1st-3rd bulging parts 25-27 adjacent to each other in the circumferential direction are circumferential. Will support each other. By forming the first to third bulging portions 25 to 27 in the grounding portion 21, it is possible to suppress a decrease in grounding stability of the double container 1.

Since the maximum circumferential length portions 25a to 27a of the first to third bulge portions 25 to 27 are arranged on the same circle C with the container axis O as the center, they are added to the grounding portion 21. In addition, the first to third bulging portions 25 to 27 can receive the impact force with less deviation over the entire circumference, and a decrease in the grounding stability of the double container 1 can be reliably suppressed.
Since the circumferential lengths L4 to L6 of the maximum circumferential length portions 25a to 27a in the first to third bulging portions 25 to 27 are equal to each other, depending on the circumferential position of the grounding portion 21 that receives the impact force. The impact force can be reliably dispersed and absorbed by the first to third bulge portions 25-27.
Since the first to third bulging portions 25 to 27 protrude downward from the holding rib 23, it is difficult for the impact force to be directly applied to the holding rib 23.

As mentioned above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and modifications, combinations, and deletions within a scope that does not depart from the gist of the present invention. Etc. are also included.
For example, in the said embodiment, although the 1st-3rd bulging parts 25-27 were formed in the curved surface shape which protruded toward the lower side, a bulged part is a bottomed cylinder which the upper side opens, for example It may be formed in a shape or a box shape. A gap may be formed between the bulging portions adjacent in the circumferential direction. The maximum circumferential length portions 25a to 27a of the first to third bulge portions 25 to 27 may be arranged so as to be displaced in the radial direction without being located on the same circle C around the container axis O. . The circumferential lengths of the maximum circumferential length portions 25a to 27a of the first to third bulging portions 25 to 27 may be different from each other. This is because even with such a configuration, an impact force such as when the double container 1 falls can be received by the bulging portion.

In the embodiment, the shapes of the first to third bulge portions 25 to 27 may be the same. Moreover, if the number of the bulging parts formed in the grounding part 21 is plural, it will not be specifically limited.
In the double container 1, the intake hole 18 is formed in the mouth portion 10, but the double container 1 has a bottom portion 12 having a slit or the like communicating with an intermediate space provided between the outer container 3 and the inner container 2. May be formed.
As the double container 1, a laminated peelable container in which an inner container 2 was peelably laminated on an inner peripheral surface of an outer container 3 was used. However, the double container is not limited to this, and may be a double container in which a gap is secured between the outer container and the inner container. However, it is preferable to use a laminate peelable container because versatility can be improved.

DESCRIPTION OF SYMBOLS 1 Double container 2 Inner container 3 Outer container 21 Grounding part 22 Depression recessed part 23 Holding rib 25 First bulging part (bulging part)
25a, 26a, 27a Maximum perimeter portion 26 Second bulging portion (bulging portion)
27 Third bulge (bulge)
C Circle L4, L5, L6 Length O Container shaft

Claims (5)

A double container comprising an inner container that contains the contents and undergoes volume reduction deformation as the contents are reduced, and an outer container in which the inner container is installed;
The bottom wall of the outer container has a grounding portion located on an outer peripheral portion, a grounded portion connected to the grounding portion from the inside in the radial direction, and a recessed recess that is recessed in the container axial direction, and is disposed in the recessed portion. Holding ribs that sandwich and hold the inner container and the outer container are formed,
2. The double container according to claim 1, wherein a plurality of bulging portions that bulge outward in the container axial direction are formed in the grounding portion along a circumferential direction around the container axis.   2. The double container according to claim 1, wherein each of the bulging portions is formed in a curved shape protruding toward the outside in the container axial direction.   The double container according to claim 1, wherein the plurality of bulging portions are arranged so as to be connected to the grounding portion in a circumferential direction.   The plurality of bulging portions are arranged so that the maximum circumferential length portion having the maximum circumferential length in each of the bulging portions is located on the same circle centering on the container axis. The double container according to any one of claims 1 to 3, wherein:   The double container according to claim 4, wherein the circumferential lengths of the maximum circumferential length portions of the bulging portions are equal to each other.

Images