JP2018016401A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container on which a crack hardly occurs on a bottom part.SOLUTION: A double container 1 of the invention comprises: an outer layer body 10 formed into a bottle shape having a mouth 11, a trunk 12 and a bottom part 13, and forms an outer shell of a container; an inner layer body 14 which can be volume-reduction deformed and stored in the outer layer body 10; and a protrusion shaped pinch-off part 20 formed on the bottom part 13. In the double container 1, the pinch-off part 20 has a first vertical wall 22 extended downward from the bottom part 13, and formed into a waveform shape in bottom surface view, a lateral wall 26 extended in a horizontal direction from a lower surface of the first vertical wall 22, and a second vertical wall 24 extended further downward from the lateral wall 26, and formed into a waveform shape having a phase difference to the first vertical wall 22 in bottom surface view.SELECTED DRAWING: Figure 5

Description

  The present invention includes a bottle-shaped outer layer body having a mouth portion, a body portion, and a bottom portion, and an inner layer body housed inside the outer layer body and capable of volumetric deformation, and an air introduction hole is provided in the mouth portion. Related to a double container.

  As a container for storing cosmetics such as skin lotion, shampoo, rinse, liquid soap, food seasoning, etc., an inner layer body having a storage section for storing contents and the inner layer body are detachably stored. An outer layer body, and the inner layer body is volume-reduced and deformed, and the contents are poured out, while air is introduced between the inner layer body and the outer layer body through an air introduction hole provided in the mouth of the outer layer body. There is known a double container that can retain its outer shape (see, for example, Patent Document 1). Since this type of container can be dispensed without replacing the contents with air, the contact of the contents with air can be reduced, and deterioration and alteration can be suppressed.

JP 2013-151316 A

  As such a double container, a delamination container called a delamination container formed by extrusion blow molding a laminated parison using a mold is known. In this case, the double container is formed by coextruding the synthetic resin for the outer layer and the synthetic resin for the inner layer with low compatibility to form a laminated parison, and this laminated parison is blow-molded using a mold to form the outer layer body. It is formed in a laminated structure in close contact with the inner layer body. Therefore, after blow molding, for example, air is pumped from the air introduction hole, or negative pressure is sucked from the mouth portion to shrink the inner layer body, and the whole is peeled off from the outer layer body. Air is fed into the outer layer body, and the whole is again brought into close contact with the outer layer body so that the inner layer body can be easily separated from the outer layer body when the contents are poured out.

  In the above-mentioned double container, an air introduction hole is provided in the mouth of the container, and after the body part of the outer layer body is pressed down to discharge the contents in the inner layer body from the spout attached to the mouth part, The outer layer body is restored to its original shape by the release, and air is introduced into the space between the outer layer body and the inner layer body through the air introduction valve and the air introduction hole, and the contents are maintained while the inner layer body is maintained in a volumetric deformation state. It is configured not to touch the air. In such a double container, when the body portion of the outer layer body is pressed in order to discharge the contents, the air introduction valve provided outside the air introduction hole is closed, and the space between the outer layer body and the inner layer body is closed. The air is not leaked. Therefore, if a crack occurs in the pinch-off portion at the bottom, a functional problem occurs. That is, even if the body portion of the outer layer body is pressed to discharge the contents, the air between the outer layer body and the inner layer body leaks out from the pinch-off portion and the internal pressure does not increase. The contents cannot be discharged at a high level.

  Conventionally, since a relatively soft resin material (polyethylene or the like) was used for the outer layer body, it was difficult for the pinch-off portion to be cracked due to impact or the like. However, for example, when a relatively hard resin material (polypropylene or the like) is used for the outer layer body, the pinch-off portion may be cracked, making it difficult to discharge the contents.

  This invention was developed in order to solve such a conventional subject, and it aims at providing the double container which is hard to produce a crack in a bottom part.

That is, the gist configuration of the present invention is as follows.
1. An outer layer body that forms a bottle shape having a mouth part, a body part, and a bottom part, forms an outer shell of the container, an inner layer body that can be reduced in volume that is housed inside the outer layer body, and a ridge formed on the bottom part In a double container provided with a pinch-off portion of shape,
The pinch-off part is
A first vertical wall extending downward from the bottom and having a wave shape in bottom view;
A lateral wall extending horizontally from the lower surface of the first longitudinal wall;
And a second vertical wall extending downward from the horizontal wall and having a wave shape having a phase difference with respect to the first vertical wall in a bottom view.

2. The double container according to 1, wherein the wave shape is a sine wave.

3. The double container according to 1 or 2, wherein the phase difference is 180 degrees.

4). The double container according to any one of 1 to 3, wherein the horizontal wall extends in a region surrounded by the first vertical wall and the second vertical wall in a bottom view.

  ADVANTAGE OF THE INVENTION According to this invention, the double container which is hard to produce a crack in a bottom part can be provided.

It is a front view which shows the double container which concerns on one Embodiment of this invention. (A) is sectional drawing of the double container mouth part by AA cross section of FIG. 1, (b) is sectional drawing of the double container mouth part by BB cross section. It is sectional drawing of the double container mouth part by CC cross section of FIG. It is a bottom view which shows the double container which concerns on one Embodiment of this invention. (A) is an enlarged view of the pinch-off part in FIG. 4, (b) is sectional drawing by DD cross section of (a).

  Hereinafter, with reference to FIGS. 1-5, the double container 1 which concerns on one Embodiment of this invention is illustrated and demonstrated in detail. In this specification, the vertical direction is based on the upright state of the double container 1, and the upper direction means the upper side in FIG. 1 and the lower side means the lower side in FIG.

  As shown in FIG. 1, the double container 1 according to the present embodiment includes a cylindrical mouth portion 11, a diameter-enlarged portion 15 that is continuous with the mouth portion 11 and expands downward, and the diameter-enlarged portion. The outer layer body 10 is formed in a bottle shape having a body portion 12 that is continuous to the body portion 15 and has a substantially cylindrical shape, and a bottom portion 13 that is continuous to the body portion 12 and closes the body portion 12. The trunk portion 12 has flexibility, can be squeezed and recessed, and can be restored from the recessed state to the original shape.

  The double container 1 also includes an inner layer body 14 (see FIG. 3). The inner layer body 14 has a shape corresponding to the shape of the outer layer body 10 and is configured to be capable of volumetric deformation. The inner layer body 14 is formed in a bag shape thinner than the outer layer body 10, and its outer surface is in close contact with the inner surface of the outer layer body 10 in a peelable manner. The opening portion of the inner layer body 14 is connected to the opening end of the mouth portion 11 of the outer layer body 10, and the inside of the inner layer body 14 is a housing portion that is continuous to the opening portion. For example, cosmetics such as lotion, shampoo, rinse, liquid soap, and liquid contents such as food seasonings are stored in the storage unit.

  In the present embodiment, the double container 1 is formed by coextruding a synthetic resin for the outer layer having low compatibility and a synthetic resin for the inner layer to form a laminated parison, and this laminated parison is blow-molded using a mold. By doing so, it is configured as a delamination container called a delamination container formed in a laminated structure in which the inner layer body 14 is in close contact with the inner surface of the outer layer body 10 in a peelable manner. Note that the double container 1 is not limited to such extrusion blow molding, and may be configured as, for example, a laminate peeling container formed by biaxial stretching blow molding of a preform having a laminated structure. The double container 1 may be the double container 1 having a configuration in which the outer layer body 10 and the inner layer body 14 are separately formed and then the inner layer body 14 is incorporated into the outer layer body 10.

  For example, a pouring cap (not shown) such as a pouring cap provided with a pouring valve, various nozzles, or a pouring pump is attached to the mouth portion 11 by a stopper. The engagement of the pouring tool by the stopper is, for example, a stopper protrusion provided on the mouth portion 11 provided on the inner peripheral surface of the outer peripheral wall of the pouring cap. This is performed by engaging the locking projection 11a with an undercut. When the double container 1 is equipped with a pouring cap in which a pouring valve is disposed in the mouth portion 11, the contents are poured from the mouth portion 11 by squeezing the body portion 12 of the outer layer body 10. Can be issued. When the outer layer body 10 is restored to its original shape after the contents are poured out, air flows into the space between the outer layer body 10 and the inner layer body 14 from an air introduction hole 11b described later. The outer layer body 10 can be restored to its original shape while reducing the volume of the storage portion. Therefore, even if the contents are poured out, air does not flow from the mouth portion 11 into the accommodating portion of the inner layer body 14, so that the contents accommodated in the accommodating portion do not come into contact with the air and deteriorate. Is prevented. In addition, by tilting the outer layer body 10, the contents accommodated in the accommodating portion of the inner layer body 14 can be poured out from the mouth portion 11 by its own weight. In addition, when a pump is attached to the mouth portion 11, an outer layer body 10 that does not have flexibility can be used. In addition, you may perform mounting | wearing of the extraction tool by screw-engaging the internal thread part provided in the internal peripheral surface of the outer peripheral wall of the extraction cap with the external thread part provided in the opening part 11. FIG.

  As shown in FIG. 1, the locking projection 11 a is a projection that continuously surrounds the periphery of the mouth portion 11, and is used for plugging and engaging the extraction tool to the mouth portion 11 as described above. As shown in FIGS. 1 and 2A, a recess is formed immediately above the locking projection 11a, and a pair of circular air introduction holes 11b are provided in the recess. The pair of air introduction holes 11 b penetrates the outer layer body 10 and communicates between the outer layer body 10 and the inner layer body 14, and introduces air when the inner layer body 14 peels from the outer layer body 10. Can do.

  A neck ring 11 d is provided below the locking projection 11 a in the mouth portion 11. The neck ring 11d is provided with four ring enlarged diameter portions 11d1 that are arranged at intervals in the circumferential direction and are expanded by bending so that the circumferential wall forming the mouth portion 11 is convex outward in the radial direction. (See FIG. 2 (b)). Between these ring enlarged diameter portions 11d1, four ring intermittent portions 11d2 that are smaller in diameter than the ring enlarged diameter portions 11d1 are arranged.

  As shown in FIGS. 1 and 2 (b), the four ring intermittent portions 11d2 include two first ring intermittent portions 11d21 positioned immediately below the two air introduction holes 11b, and the first ring intermittent portions in the circumferential direction. It consists of two second ring intermittent portions 11d22 located between the portions 11d21. As shown in FIG. 3, the first ring intermittent portion 11 d 21 is formed by bending a peripheral wall forming the mouth portion 11 so as to form a vertical cross-section V shape. Further, as can be seen from FIG. 2B, the first ring intermittent portion 11d21 has a smaller bending outward in the radial direction than the ring enlarged diameter portion 11d1, and thus the inner layer body 14 can be easily peeled from the outer layer body. Can do. Further, as shown in FIG. 2B, the second ring intermittent portion 11d22 is formed by bending the peripheral wall forming the mouth portion 11 so as to form a V-shaped cross section.

  As described above, by disposing the first ring intermittent portion 11d21 immediately below the air introduction hole 11b, the inner layer body 14 can be easily separated from the outer layer body in the vicinity of the air introduction hole 11b. 10 and the inner layer body 14 can be reliably connected to the air introduction hole 11b.

  Below the mouth portion 11, there is provided an enlarged diameter portion 15 that continues to the mouth portion 11 and expands downward. In addition, in this specification, the enlarged diameter part 15 shall point out the area | region expanded diameter downward from the lower end of the neck ring 11d to the upper end of the trunk | drum 12 which has a substantially cylindrical shape. .

  For example, after blow molding of the double container 1, the inner layer body 14 is contracted by negative pressure suction to be peeled off from the outer layer body 10, and then air is fed into the inner layer body 14. By disposing the first ring intermittent portion 11d21, the inner layer body 14 can be easily separated from the outer layer body in the vicinity of the air introduction hole 11b. Therefore, after the contents are accommodated in the inner layer body 14 and poured out from the mouth part 11, air is introduced from the air introduction hole 11b, and the body part 12 is formed with the gap around the first ring intermittent part 11d21 as a ventilation path. It is possible to easily allow air to flow between the outer layer body 10 and the inner layer body 14.

  In addition, by providing the double container 1 with the neck ring 11d, when the pouring tool is attached to the mouth portion 11 with a stopper, the bottom surface of the neck ring 11d is supported by the support tool and poured into the mouth portion 11. The tool can be stoppered. At this time, the neck ring 11d is provided with a ring intermittent part 11d2 in which the diameter expansion is suppressed as compared with the ring widened part 11d1, so that the ring intermittent part 11d2 functions as a column part, so The buckling strength of the neck ring 11d can be improved. Therefore, according to the double container 1, it is possible to realize stabilization of the pouring operation of the pouring tool with respect to the mouth portion 11.

  Moreover, in this embodiment, although it comprised so that a discharge tool might be mounted | worn with the latching protrusion 11a, it is not limited to this aspect. The discharge tool may be attached to the mouth portion 11 by means such as welding, and a lid or the like that closes the discharge hole may be attached to the locking projection 11a.

  The bottom portion 13 has an annular outer edge portion 13a that serves as a ground contact surface, and a recess portion 13b that is recessed upward on the inner peripheral side of the outer edge portion 13a. Further, as shown in FIGS. 1 and 4, the outer layer body 10 and the inner layer body 14 are sandwiched and crushed at the center of the concave portion 13b of the bottom portion 13 by a blow mold, and the tip thereof is bitten away. The pinch-off part 20 formed by is provided. The pinch-off portion 20 has a ridge shape extending in the outer peripheral direction from the center axis O to the vicinity of the outer edge portion 13a.

  Fig.5 (a) is an enlarged view of the pinch-off part 20 shown in FIG. As shown in FIGS. 5A and 5B, the pinch-off portion 20 extends downward from the recess 13b, has a sinusoidal shape in a bottom view, and extends from the central axis O in the outer peripheral direction. 22, a horizontal wall 26 extending horizontally from the lower surface of the first vertical wall 22, and a sine wave shape extending further downward from the horizontal wall 26 and having a phase difference of 180 degrees with respect to the first vertical wall 22 in a bottom view. A second vertical wall 24 having Further, the horizontal wall 26 extends in a region surrounded by the first vertical wall 22 and the second vertical wall 24 in a bottom view.

  In the pinch-off portion 20 having the configuration shown in FIGS. 5A and 5B, the wall surfaces having strengths in the three directions A, B, and C shown in FIGS. 5A and 5B are combined. Therefore, even if an external force is applied to the pinch-off part 20 from any direction, the wall surfaces support each other so that stress can be dispersed. Therefore, each region of the pinch-off part 20 has to bear a small load. Good. Therefore, the mechanical strength of the pinch-off part 20 can be increased. The effect of increasing the strength in these three directions is that the phase difference between the first vertical wall 22 and the second vertical wall 24 in the bottom view is 180 degrees and is connected to the horizontal wall 26 as in this embodiment. Can be maximized.

  In the present embodiment, the shapes of the first vertical wall 22 and the second vertical wall 24 in a bottom view are sine waves, but are not limited to this mode. Other wave shapes such as a rectangular wave and a trapezoidal wave other than the sine wave can be used. However, it is desirable to have a wave shape having a smooth curve such as a sine wave from the viewpoint of easy relaxation of stress. Moreover, it is not limited to the waveform of a fixed period like this embodiment, For example, the period of a waveform may differ in the center and the outer periphery side. Further, the first vertical wall 22 and the second vertical wall 24 may have different wave shapes.

  In the present embodiment, the first vertical wall 22 and the second vertical wall 24 are configured to have a phase difference of 180 degrees when viewed from the bottom. However, the present invention is not limited to this mode. If the first vertical wall 22 and the second vertical wall 24 have a certain phase difference or more, it is considered that the effect of dispersing the stress applied to the pinch-off portion 20 can be obtained.

  Moreover, in this embodiment, although it comprised so that the 1st vertical wall 22 and the 2nd vertical wall 24 may each have a wall surface extended below, it is not limited to this aspect, 45 degrees or less with respect to a downward direction You may comprise so that it may extend with the angle of. Similarly, the horizontal wall 26 may be configured to extend at an angle of 45 degrees or less with respect to the horizontal direction.

  In the present embodiment, the horizontal wall 26 is configured to extend in a region surrounded by the first vertical wall 22 and the second vertical wall 24 in a bottom view, but is not limited to this mode. You may comprise so that the horizontal wall 26 may extend outside the area | region enclosed by the 1st vertical wall 22 and the 2nd vertical wall 24. FIG.

  As described above, in the double container 1 according to the present embodiment, the pinch-off portion 20 provided on the bottom portion 13 includes the first vertical wall 22 having a sinusoidal shape in a bottom view and the first vertical wall 22. A horizontal wall 26 extending in the horizontal direction from the lower surface, and a second vertical wall 24 extending further downward from the horizontal wall 26 and having a wave shape having a phase difference of 180 degrees with respect to the first vertical wall 22 in bottom view. Configured to have. As a result, even if an external force, an internal stress, or the like is applied to the pinch-off portion 20, the stress can be dispersed by the two vertical walls 22 and 24 having a phase difference and the horizontal wall, and as a result, the strength of the pinch-off portion 20 is ensured. It is possible to make cracks difficult to occur.

  Further, according to the present embodiment, since the two vertical walls 22 and 24 are configured to have a sinusoidal shape that is a smooth curved surface in a bottom view, the adjacent walls support the stress applied to the vertical walls 22 and 24. By matching, the stress can be effectively dispersed and the stress concentration can be suppressed, and cracking of the pinch-off portion 20 can be further prevented.

  Further, according to the present embodiment, since the phase difference between the first vertical wall 22 and the second vertical wall 24 in the bottom view is 180 degrees, the effect of dispersing the stress and increasing the strength of the pinch-off portion 20 is maximized. Can be

  Further, according to the present embodiment, since the horizontal wall 26 is configured to extend in a region surrounded by the first vertical wall 22 and the second vertical wall 24 in a bottom view, the horizontal wall 26 is a vertical wall. Therefore, it is possible to make it difficult for external force to be applied to the lateral wall 26 without protruding outward from the outer walls 22 and 24.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the pair of air introduction holes 11b are provided in the mouth portion 11. However, the number of the air introduction holes 11b is not limited to two, and one or three or more may be provided. Moreover, although the mouth part 11, the enlarged diameter part 15, the trunk | drum 12, and the bottom part 13 have illustrated all having a circular shape in plan view, they may have an elliptical shape or other shapes.

DESCRIPTION OF SYMBOLS 1 Double container 10 Outer layer body 11 Mouth part 11a Locking protrusion 11b Air introduction hole 11d Neck ring 11d1 Ring enlarged diameter part 11d2 Ring intermittent part 11d21 1st ring intermittent part 11d22 2nd ring intermittent part 12 trunk | drum 13 bottom 14 inner layer body DESCRIPTION OF SYMBOLS 15 Wide diameter part 20 Pinch-off part 22 1st vertical wall 24 2nd vertical wall 26 Horizontal wall O Center axis

Claims (4)

An outer layer body that forms a bottle shape having a mouth part, a body part, and a bottom part, forms an outer shell of the container, an inner layer body that can be reduced in volume that is housed inside the outer layer body, and a ridge formed on the bottom part In a double container provided with a pinch-off portion of shape,
The pinch-off part is
A first vertical wall extending downward from the bottom and having a wave shape in bottom view;
A lateral wall extending horizontally from the lower surface of the first longitudinal wall;
And a second vertical wall extending downward from the horizontal wall and having a wave shape having a phase difference with respect to the first vertical wall in a bottom view.   The double container according to claim 1, wherein the wave shape is a sine wave.   The double container according to claim 1 or 2, wherein the phase difference is 180 degrees. The double container according to any one of claims 1 to 3, wherein the horizontal wall extends in a region surrounded by the first vertical wall and the second vertical wall in a bottom view.

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