JP2020200088A - Multiple container - Google Patents

Abstract

To provide a multiple container capable of reliably restoring an outer container when pressure by a squeeze operation is released.SOLUTION: A multiple container 1 is a bottle-shaped multiple container where an inner container 20 contracting as a content decreases and an outer container 10 incorporating the inner container 20 are laminated such that they can be released. A trunk 5 of the multiple container 1 is provided with an uneven part 80 where recesses and projections are formed in a radial direction and which is formed across in a peripheral direction. The uneven part 80 includes: a plurality of unit surface parts 81 which form a geometrical shape and are arranged serially in the peripheral direction; and a ridge line part 82 formed by boundary parts of the adjacent unit surface parts 81.SELECTED DRAWING: Figure 12

Description

The present invention relates to multiple containers.

As a container for containing contents such as liquid seasonings or liquid cosmetics and maintaining the freshness thereof, a multi-layer container called a derami bottle, an airless bottle, a laminated peeling container or the like is known (for example, Patent Document 1).

Patent Document 1 describes a multiple container in which a central peripheral groove is provided in the central portion of the body portion for the purpose of appropriately restoring the outer container when the pressure on the outer container by the squeeze operation is released.

Japanese Unexamined Patent Publication No. 2008-162666

In the multiple container described in Patent Document 1, since the central peripheral groove is only provided in the central portion of the body portion, a large amount of the container may be pressed except for the central portion of the body portion or even in the central portion of the body portion. The outer container may not be properly restored if pressed with great force to quickly eject the contents of the container. Therefore, the multiple container described in Patent Document 1 has room for improvement in that the outer container is surely restored when the pressing by the squeeze operation is released.

The present invention has been made in view of the above circumstances, and it is an example of a problem to solve the above-mentioned problems. That is, one example of the subject of the present invention is to provide a multi-layer container capable of reliably restoring the outer container when the pressing by the squeeze operation is released.

The multiple container according to the present invention is a bottle-shaped multiple container in which an inner container that shrinks as the contents decrease and an outer container that contains the inner container are laminated so as to be peelable. The body portion is provided with uneven portions formed in the radial direction and formed in the circumferential direction, and the uneven portions form a geometric shape and are continuously arranged in a plurality in the circumferential direction. It is characterized by including a unit surface portion and a ridge line portion formed by a boundary portion between adjacent unit surface portions.

Preferably, in the multiple container, the body portion of the outer container is formed so as to be elastically deformable with respect to the pressing force applied by the squeeze operation, and the uneven portion disperses the pressing force at the ridgeline portion. This is characterized by expanding the area of elastic deformation in the body portion of the outer container.

Preferably, in the multiple container, upper and lower portions of the body portion are provided with an upper bead and a lower bead extending in the circumferential direction, respectively, and the uneven portion is between the upper bead and the lower bead. It is characterized in that it is provided in the area of.

Preferably, in the multiple container, the uneven portion further includes an intersection where the ridge lines intersect with each other, the unit surface portion has a polygonal shape, and the direction from the shoulder portion to the bottom portion of the multiple container. The ridge line portion includes a first ridge line portion extending in the direction from the shoulder portion toward the bottom portion and a second ridge line portion extending in the circumferential direction, and the intersection portion is the first ridge line portion. It is characterized in that it is formed by the intersection of the 1st ridgeline portion and the 2nd ridgeline portion.

Preferably, in the multiple container, the uneven portion is formed by a concave rib that is recessed inward in the radial direction and extends in a direction from the shoulder portion to the bottom portion of the multiple container, and the unit surface portion is the diameter of the concave rib. It is characterized in that it is formed by a concave portion located on the inner side in the direction, and the early ridge line portion is formed by a convex portion located on the radial outer side of the concave rib.

Preferably, in the multiple container, the inner container and the outer container are made of polyethylene terephthalate resin.

According to the present invention, it is possible to provide a multi-layer container capable of reliably restoring the outer container when the pressing by the squeeze operation is released.

It is a perspective view which shows typically the appearance of the multi-layer container which concerns on this embodiment. It is a side view which drew the multiple container shown in FIG. 1 by a diagram. It is a vertical sectional view of the multi-layer container shown in FIG. It is a figure for demonstrating the manufacturing method of the multi-container shown in FIG. It is an enlarged perspective view of the vicinity of the mouth part shown in FIG. It is a vertical cross-sectional view of the vicinity of the mouth shown in FIG. It is the figure which drew only the outer container in the vicinity of the mouth part shown in FIG. It is an enlarged perspective view around the shoulder part shown in FIG. It is an enlarged side view of the vicinity of the shoulder shown in FIG. It is a perspective view for demonstrating another form of the concavo-convex portion provided on the shoulder portion. FIG. 5 is a side view in which the uneven portion shown in FIG. 10 is drawn in a line diagram. It is an enlarged perspective view of the vicinity of the body part shown in FIG. It is an enlarged side view of the vicinity of the body part shown in FIG. It is a perspective view for demonstrating another form of the concavo-convex portion provided on the body part. FIG. 3 is a side view in which the uneven portion shown in FIG. 14 is drawn in a line diagram. It is an enlarged perspective view around the heel part shown in FIG. It is an enlarged side view of the vicinity of the heel portion shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below show some examples of the present invention and do not limit the contents of the present invention. Moreover, not all of the configurations or operations described in the embodiments are essential as the configurations or operations of the present invention.

In the present embodiment, the direction from the mouth 3 to the bottom 6 of the multiple container 1 having a bottle shape is also referred to as "downward", and the direction from the bottom 6 to the mouth 3 of the multiple container 1 is also referred to as "upward". And the lower part are also collectively referred to as "vertical direction". Further, in the present embodiment, the direction orthogonal to the central axis Z of the multiple container 1 is also referred to as "diametrical direction", and the direction orbiting with respect to the central axis Z on the plane orthogonal to the central axis Z of the multiple container 1 is ". It is also referred to as "circumferential direction", and the direction along the central axis Z of the multiple container 1 is also referred to as "axial direction". Further, in the present embodiment, a cross section obtained by cutting the multiple container 1 along a plane along the central axis Z of the multiple container 1 is also referred to as a “vertical cross section”, and the multiple container 1 is provided on a plane orthogonal to the central axis Z of the multiple container 1. The cut section is also referred to as a "cross section".

[Multiple container configuration]
FIG. 1 is a perspective view schematically showing the appearance of the multilayer container 1 according to the present embodiment. FIG. 2 is a side view of the multiple container 1 shown in FIG. 1 drawn in a schematic diagram. FIG. 3 is a vertical cross-sectional view of the multilayer container 1 shown in FIG. The alternate long and short dash line in FIG. 3 indicates a state in which the inner surface of the outer container 10 and the outer surface of the inner container 20 are peeled off and the inner container 20 is contracted.

The multiple container 1 is a container having a bottle shape. The multiple container 1 is a freshness-preserving bottle that contains contents such as liquid seasonings, liquid cosmetics, and beverages, and retains the freshness thereof.

The multilayer container 1 is a bottle made of a thermoplastic resin and is manufactured by blow molding. Preferably, the multiple container 1 is manufactured by biaxially stretching blow molding a preform formed into a bottomed tubular shape such as a test tube shape by injection molding or the like.

The molding material of the multilayer container 1 includes a polyolefin resin, an ethylene-vinyl copolymer, a styrene resin, a vinyl resin, a polyamide resin, a polyester resin, a polycarbonate resin, a polyphenylene oxide resin, or a raw material. Degradable resin and the like can be mentioned. Preferably, the molding material of the multiple container 1 includes a polyolefin resin or a polyester resin. More preferably, a polyester resin can be mentioned as a molding material for the multiple container 1. Examples of the polyester-based resin include resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene furanoate, and copolymerized polyesters thereof. Particularly preferably, the molding material of the multilayer container 1 is a polyethylene terephthalate resin. That is, it is particularly preferable that the outer container 10 and the inner container 20 are made of polyethylene terephthalate resin.

As shown in FIGS. 1 to 3, the multiple container 1 is a mouth portion 3 which is one end of the multiple container 1 and includes a spout for contents, and the other end of the multiple container 1 which is a ground contact portion 61 and a heel. It includes a bottom portion 6 including a portion 62. Further, the multiple container 1 includes a shoulder portion 4 extending downward from the mouth portion 3 while expanding outward in the radial direction, and a body portion 5 extending downward from the shoulder portion 4 and connecting to the heel portion 62 of the bottom portion 6. The grounding portion 61 is a portion that comes into contact with the grounded surface when the multiple container 1 is allowed to stand on the grounded surface. The heel portion 62 is a portion extending from the body portion 5 to the ground contact portion 61.

As shown in FIGS. 1 and 3, the multi-container 1 includes a bottle-shaped outer container 10 that constitutes the outer shell of the multi-container 1 and contains the inner container 20, and the contents and the inner surface of the outer container 10. An inner container 20 having a shape along the shape is provided. The multilayer container 1 has a multilayer structure in which the inner surface of the outer container 10 and the outer surface of the inner container 20 are laminated so as to be peelable.

The bottom portion 6 of the outer container 10 is formed so that the multiple container 1 can stand on its own when the grounding portion 61 is grounded. The bottom 6 may be formed in a so-called concave dome shape or petaloid shape. The body portion 5 of the outer container 10 is formed so as to be elastically deformable with respect to the pressing force applied by the squeeze operation. That is, the body portion 5 of the outer container 10 is formed so as to bend and deform inward when pressed by the squeeze operation, and to be restored to the original shape before pressing when the pressing is released.

The inner container 20 includes a storage space S for accommodating the contents and an opening 21 that functions as a spout for the contents, and is formed to be contractable as the contents decrease. The inner container 20 is formed to have a wall thickness thinner than that of the outer container 10 so that the shoulder portion 4, the body portion 5, and the heel portion 62 contract as the contents decrease. The ground contact portion 61 of the inner container 20 is formed so as to maintain a state of being in close contact with the outer container 10 even if the contents are reduced.

In the multiple container 1, an air introduction section 30 for introducing air from the outside is provided between the outer container 10 and the inner container 20 with respect to the mouth portion 3. The air introduction portion 30 communicates with the void A as shown in FIG. The gap A is a space formed between the outer container 10 and the inner container 20 in the shoulder portion 4, the body portion 5 and the heel portion 62 by peeling off the inner surface of the outer container 10 and the outer surface of the inner container 20. is there. The detailed configuration of the air introduction unit 30 will be described later with reference to FIGS. 5 to 7.

Further, in the multiple container 1, a cap with a check valve is attached to the mouth portion 3. In the multiple container 1, when the outer container 10 is pressed by a squeeze operation, the contents are poured out and the inner container 20 contracts. When the pressing of the outer container 10 is released, the outer container 10 is restored to its original shape before being pressed, while the contracted state of the inner container 20 is caused by the air introduction from the air introduction portion 30 into the void A and the action of the check valve. Be maintained. As a result, in the multiple container 1, the inner container 20 shrinks as the contents decrease, and the inflow of air from the opening 21 is suppressed, so that the oxidation of the contents is suppressed and the freshness is maintained. be able to.

[Manufacturing method of multiple containers]
FIG. 4 is a diagram for explaining a method for manufacturing the multiple container 1 shown in FIG.

As a method for manufacturing the multiple container 1, first, a molding step of the multiple container 1 is performed (step 401). In the molding step, first, the preform corresponding to each of the outer container 10 and the inner container 20 is molded by injection molding or the like. Next, the multiple container 1 is formed by inserting the preform corresponding to the inner container 20 into the preform corresponding to the outer container 10 and simultaneously performing biaxial stretching blow molding in a state where both are overlapped. This biaxial stretch blow molding method for the multiple container 1 is also referred to as a stack preform method. The preform corresponding to the outer container 10 and the preform corresponding to the inner container 20 correspond to the mouth portion 3 of the multiple container 1 and are a non-stretched portion that is not stretched by biaxial stretching blow molding, and a multiple container. It corresponds to the shoulder portion 4, the body portion 5 and the bottom portion 6 of No. 1, and is composed of a stretched portion which is a portion stretched by biaxial stretching blow molding.

After the molding step, as a method for manufacturing the multiple container 1, a peeling step of shrinking the molded inner container 20 and peeling it from the outer container 10 is performed (step 402). In the peeling step, the inner container 20 is contracted by sucking air from the opening 21 of the molded inner container 20, and the outer surfaces of the shoulder portion 4, the body portion 5 and the heel portion 62 of the inner container 20 are formed. The outer container 10 is peeled from the inner surfaces of the shoulder portion 4, the body portion 5, and the heel portion 62. The ground contact portion 61 of the inner container 20 is maintained in close contact with the ground contact portion 61 of the outer container 10.

After the peeling step, as a method for manufacturing the multiple container 1, a restoration step of expanding the contracted inner container 20 and restoring it to a shape along the outer container 10 is performed (step 403). In the restoration step, the inner container 20 is restored by blowing air from the opening 21 provided in the mouth 3 of the inner container 20 or the like.

After the restoration step, as a method for manufacturing the multiple container 1, a filling step of filling the restored inner container 20 with the contents and sealing the container 20 is performed (step 404). In the filling step, first, the inner container 20 is filled with the contents. Next, in the filling step, the inside of the inner container 20 is sealed by attaching a cap to the mouth portion 3 so as to cover the opening 21 from above.

After that, as a method for manufacturing the multiple container 1, a packaging step of packaging a package such as a label or a film on the outer surface of the multiple container 1 filled with the contents, or a corrugated cardboard or the like by transporting the packaged multiple container 1 The packing process, etc., is performed.

[Detailed composition of the mouth]
FIG. 5 is an enlarged perspective view of the vicinity of the mouth portion 3 shown in FIG. FIG. 6 is a vertical cross-sectional view of the vicinity of the mouth portion 3 shown in FIG. FIG. 7 is a diagram in which only the outer container 10 is drawn in the vicinity of the mouth portion 3 shown in FIG.

The mouth 3 of the inner container 20 includes an opening 21 that functions as a spout for the contents, as shown in FIGS. 5 and 6. The edge portion 22 which is the peripheral edge of the opening portion 21 is provided so as to form a flange shape so as to project outward in the radial direction and extend in the circumferential direction. The edge portion 22 has a radial outward protrusion dimension that is not the same over the entire circumferential direction, and a radial outward protrusion dimension in a part of the circumferential direction is smaller than a dimension in the other portion. May be provided in.

A ring portion 23 that protrudes outward in the radial direction and extends in the circumferential direction is provided on the outer peripheral surface of the mouth portion 3 of the inner container 20 and below the edge portion 22. The ring portion 23 is provided so that the radial outward protrusion dimension is larger than the radial protrusion dimension of the edge portion 22. The ring portion 23 is used for gripping or transporting the preform corresponding to the inner container 20. The lower portion 24 below the ring portion 23 is a portion connected to the shoulder portion 4 of the inner container 20.

The mouth 3 of the outer container 10 includes an opening 11 into which the mouth 3 of the inner container 20 is inserted, as shown in FIGS. 5 and 6. The edge portion 12 which is the peripheral edge of the opening 11 is provided so that the inner peripheral surface thereof is separated from the outer peripheral surface of the edge portion 22 of the inner container 20. A first slit 31 that communicates with the outside is formed between the inner peripheral surface of the edge portion 12 of the outer container 10 and the outer peripheral surface of the edge portion 22 of the inner container 20. A mounted portion 13 to which a cap is mounted is provided on the outer peripheral surface of the edge portion 12. The mounted portion 13 of FIGS. 5 and 6 is composed of ridges extending in the circumferential direction so that a plug-type cap can be mounted. A support ring portion 14 used for gripping or transporting the outer container 10 and the corresponding preform is provided on the outer peripheral surface of the mouth portion 3 of the outer container 10 and below the mounted portion 13.

A step portion 15 extending inward in the radial direction and extending in the circumferential direction is provided between the edge portion 12 and the support ring portion 14 on the inner peripheral surface of the mouth portion 3 of the outer container 10. The step portion 15 is provided so as to fit with the ring portion 23 provided at the mouth portion 3 of the inner container 20. The step portion 15 supports the mouth portion 3 of the inner container 20 inside the mouth portion 3 of the outer container 10 by fitting with the ring portion 23.

The lower portion 16 of the mouth portion 3 of the outer container 10 below the step portion 15 is a portion connected to the shoulder portion 4 of the outer container 10. The lower portion 16 is provided so that its inner peripheral surface is separated from the outer peripheral surface of the lower portion 24 of the inner container 20. A second slit 32 communicating with the gap A is formed between the inner peripheral surface of the lower portion 16 of the outer container 10 and the outer peripheral surface of the lower portion 24 of the inner container 20.

Further, as shown in FIG. 7, band-shaped groove portions 33 having a width in the circumferential direction and extending in the axial direction are spaced along the circumferential direction on the inner peripheral surface of the mouth portion 3 of the outer container 10. It is provided at multiple locations. The groove portion 33 is formed so as to extend from the edge portion 12 of the outer container 10 until it passes through the step portion 15 and communicates with the lower portion 16. The groove 33 communicates the first slit 31 and the second slit 32. The number of groove portions 33 counted in the circumferential direction may be, for example, 24.

As described above, in the multiple container 1, in the mouth portion 3, the first slit 31 communicating with the outside, the second slit 32 communicating with the void A, and the first slit 31 and the second slit 32 communicate with each other. The groove 33 is included. Then, in the multiple container 1, the first slit 31, the second slit 32, and the groove 33 form an air introduction section 30 that introduces air from the outside between the outer container 10 and the inner container 20 to form a gap A. To do.

In addition, although FIG. 7 shows an example in which the groove 33 is provided with respect to the inner peripheral surface of the mouth 3 of the outer container 10, the groove 33 is the outer peripheral surface of the mouth 3 of the inner container 20, particularly. , May be provided on the outer peripheral surface of the ring portion 23.

[Detailed composition of shoulders]
FIG. 8 is an enlarged perspective view of the vicinity of the shoulder portion 4 shown in FIG. FIG. 9 is an enlarged side view of the vicinity of the shoulder portion 4 shown in FIG.

In the multiple container 1, after biaxial stretching blow molding as described above, the inner surface of the outer container 10 and the outer surface of the inner container 20 are in close contact with each other. If the outer container and the inner container are in close contact with each other, there is a possibility that the air flow path introduced from the air introduction portion cannot be secured between the outer container and the inner container. As a result, in the multiple container, the inner container may contract irregularly when the contents are poured, which may hinder the smooth pouring of the contents. Therefore, in the multiple container 1, as described above, the peeling step and the restoring step are performed, the inner container 20 is contracted so as to be peeled from the outer container 10, and then expanded, and the shape is restored along the outer container 10. Will be done.

However, since the shoulder portion of the multi-layer container tends to be thicker than the body portion, the degree of freedom of deformation is low. Therefore, in the shoulder portion of the multiple container, the outer container and the inner container may not be completely separated in the peeling step, and a close contact portion between the outer container and the inner container may occur. As a result, in the multiple container, it is not possible to reliably secure an air flow path between the outer container and the inner container at the shoulder portion, and the air introduced from the air introduction portion is taken out of the shoulder portion and the body portion. There is a possibility that it cannot be smoothly distributed between the container and the inner container.

Therefore, the shoulder portion 4 of the multiple container 1 is provided with an uneven portion 70 so that an air flow path is secured between the outer container 10 and the inner container 20 in the shoulder portion 4.

As shown in FIG. 8, the uneven portion 70 has irregularities in the radial direction and is formed in the vertical direction and the circumferential direction. The uneven portion 70 does not have beads, ribs, grooves, or the like formed on the shoulder portion 4, or the shape of the shoulder portion 4 itself is a polyhedral shape, but the shoulder portion 4 has a cross-sectional shape close to a circular or elliptical shape. On the other hand, it is formed so as to show an appearance as if a three-dimensional geometric pattern is provided.

Specifically, as shown in FIGS. 8 and 9, the uneven portion 70 includes a unit surface portion 71, a ridgeline portion 72, and an intersection portion 75.

The unit surface portion 71 corresponds to each geometrically shaped surface that constitutes the geometric pattern. Specifically, the unit surface portion 71 has a geometric shape such as a polygonal shape or an arc shape. The unit surface portion 71 shown in FIG. 8 has a polygonal shape including a quadrangle such as a parallelogram or a rhombus. A plurality of unit surface portions 71 are continuously arranged in the direction from the mouth portion 3 to the body portion 5, that is, in the vertical direction, and a plurality of unit surface portions 71 are continuously arranged in the circumferential direction.

A plurality of unit surface portions 71 may be arranged in the same geometric shape, or a plurality of combinations of several geometric shapes may be arranged. A plurality of the unit surface portions 71 shown in FIG. 8 are arranged so that the orientations of the unit surface portions 71 adjacent to each other in the vertical direction are staggered and the orientations of the unit surface portions 71 adjacent to each other in the circumferential direction are the same.

The ridge line portion 72 corresponds to a boundary portion between geometrically shaped surfaces constituting the geometric pattern. Specifically, the ridge line portion 72 is formed by a boundary portion between adjacent unit surface portions 71. The ridge line portion 72 includes a first ridge line portion 73 extending in the direction from the mouth portion 3 to the body portion 5, that is, in the vertical direction, and a second ridge line portion 74 extending in the circumferential direction. The ridge line portion 72 is formed in a mesh shape so as to cover the shoulder portion 4 in the circumferential direction and the vertical direction.

The first ridge line portion 73 is formed by arranging two unit surface portions 71 adjacent to each other in the circumferential direction with the first ridge line portion 73 as a boundary so as to bring their inner surfaces close to each other. The first ridge line portion 73 is formed so as to project outward in the radial direction from the two unit surface portions 71 adjacent to each other in the circumferential direction with the first ridge line portion 73 as a boundary. The first ridge line portion 73 is formed so as to extend radially from the mouth portion 3 toward the body portion 5 while bending in a zigzag shape when viewed from the mouth portion 3.

The second ridge line portion 74 is formed by arranging two unit surface portions 71 adjacent to each other in the vertical direction with the second ridge line portion 74 as a boundary so as to bring their inner surfaces close to each other. The second ridge line portion 74 is formed so as to protrude outward in the radial direction from the two unit surface portions 71 adjacent in the vertical direction with the second ridge line portion 74 as a boundary. The second ridge line portion 74 is formed so as to form a concentric circle extending in the circumferential direction about the central axis Z when viewed from the mouth portion 3.

The ridge line portion 72 is provided so that the number of the first ridge line portions 73 counted in the circumferential direction is larger than the number of the groove portions 33 counted in the circumferential direction. When the number of groove portions 33 counted in the circumferential direction is 24, the number of first ridge line portions 73 counted in the circumferential direction may be, for example, 36.

The intersection 75 corresponds to an intersection between the boundaries of the geometrically shaped surfaces that form the geometric pattern. Specifically, the intersection 75 is a portion where the ridges 72 intersect with each other. The intersection 75 is formed by the intersection of the first ridge line portion 73 and the second ridge line portion 74.

With such a configuration, in the shoulder portion 4 of the multiple container 1, the ridgeline portion 72 of the inner container 20 is more likely to bend before the unit surface portion 71, and can be the starting point of shrinkage deformation of the inner container 20. It can be easily peeled off from the outer container 10.

In particular, in the multiple container 1, even if it is made of polyethylene terephthalate resin, which has lower flexibility than a polyolefin resin or the like, the ridge line portion 72 can be the starting point of shrinkage deformation, so that the inner container 20 can be easily peeled off from the outer container 10. can do.

Then, in the shoulder portion 4 of the multiple container 1, when the inner container 20 is peeled from the outer container 10 and then restored, it is unlikely that the inner container 20 is completely restored to the original position and shape before the peeling. In particular, at this time, it is extremely unlikely that the inner container 20 will be restored so that the outer surface of the ridgeline portion 72 of the inner container 20 is completely in close contact with the inner surface of the ridgeline portion 72 of the outer container 10. Therefore, in the uneven portion 70, at least the ridgeline portion 72 can form a gap A as an air flow path between the outer container 10 and the inner container 20 in the shoulder portion 4. That is, in the shoulder portion 4 of the multiple container 1, by providing the uneven portion 70, a gap A is formed at least between the outer container 10 and the inner container 20 at the ridgeline portion 72, and the air flow path is surely secured. can do.

Therefore, in the multiple container 1, the outer container 10 and the inner container 20 can be easily separated from each other at the shoulder portion 4, and an air flow path can be reliably secured between them.

Further, in the shoulder portion 4 of the multiple container 1, the ridgeline portion 72 of the inner container 20 is composed of a ridgeline portion 72 extending in two directions of a first ridgeline portion 73 and a second ridgeline portion 74 intersecting each other. Therefore, in the shoulder portion 4 of the multiple container 1, the degree of freedom of deformation of the inner container 20 can be increased as compared with the case where the ridgeline portion 72 extends in one direction, so that the inner container 20 is peeled off from the outer container 10. It can be made easier. In addition, in the shoulder portion 4 of the multiple container 1, since the ridge line portion 72 is formed in a mesh shape extending in the circumferential direction and the vertical direction, the inner container portion covers the entire shoulder portion 4 without being biased to a specific portion. 20 can be easily peeled off from the outer container 10.

Then, in the shoulder portion 4 of the multiple container 1, the gap A formed in a certain first ridge line portion 73 extending in the vertical direction is moved up and down through the gap A formed in the second ridge line portion 74 extending in the circumferential direction. It can communicate with the void A formed in the other first ridge line portion 73 extending in the direction. As a result, in the shoulder portion 4 of the multilayer container 1, even if a certain flow path extending in the vertical direction is blocked, air can be passed through another flow path extending in the vertical direction through the flow path extending in the circumferential direction. Can be distributed.

Therefore, in the multiple container 1, the outer container 10 and the inner container 20 can be more easily separated from each other on the shoulder portion 4, and an air flow path can be more reliably secured between them.

Further, the shoulder portion 4 of the multiple container 1 is provided so that the number of the first ridge line portions 73 counted in the circumferential direction is larger than the number of the groove portions 33 counted in the circumferential direction. Therefore, in the multiple container 1, a larger number of voids A extending in the vertical direction in the shoulder portion 4 having a longer peripheral length than the mouth portion 3 can be formed in the groove portion 33 extending in the vertical direction in the mouth portion 3. Therefore, in the shoulder portion 4 of the multiple container 1, the air flow path extending in the vertical direction can be surely secured, and the air introduced from the air introduction portion 30 provided in the mouth portion 3 can be smoothly circulated. Therefore, the inner container 20 can be easily separated from the outer container 10.

As will be described later with reference to FIGS. 14 and 15, concave ribs 86, which are recessed inward in the radial direction and extend in the direction from the shoulder portion 4 to the bottom portion 6, are formed in the body portion 5 of the multiple container 1 in the circumferential direction. A plurality may be provided. As a result, in the multiple container 1, it is extremely unlikely that the inner container 20 will be restored so that the outer surface of the concave rib 86 of the inner container 20 is completely in close contact with the inner surface of the concave rib 86 of the outer container 10 in the restoration step. In addition, in the multiple container 1, since the pressing force applied by the squeeze operation can be dispersed to the surroundings, the outer container 10 can be reliably restored when the pressing force by the squeeze operation is released, and the air can be reliably restored. Air can be reliably introduced from the introduction unit 30. As a result, in the multiple container 1, air can be easily circulated between the outer container 10 and the inner container 20 in the shoulder portion 4, and the outer container 10 and the inner container 20 can be easily separated from each other in the shoulder portion 4. , The air flow path can be surely secured between them.

FIG. 10 is a perspective view for explaining another form of the uneven portion 70 provided on the shoulder portion 4. FIG. 11 is a side view in which the uneven portion 70 shown in FIG. 10 is drawn in a line diagram.

The uneven portion 70 shown in FIG. 8 is formed so that the unit surface portion 71 has a quadrangular shape and the first ridge line portion 73 extends in the direction from the mouth portion 3 to the body portion 5 while bending in a zigzag shape. ..

On the other hand, in the uneven portion 70 shown in FIG. 10, the unit surface portion 71 has a triangular shape, and the area of the unit surface portion 71 is small. Further, in the uneven portion 70 shown in FIG. 10, the first ridge line portion 73 does not bend in a zigzag shape and extends in the direction from the mouth portion 3 toward the body portion 5 while being inclined obliquely with respect to the axial direction. Is formed as follows.

In the uneven portion 70 shown in FIG. 10, since the unit surface portion 71 has a triangular shape, the ridge line branching from one intersection 75 than the uneven portion 70 shown in FIG. 8 in which the unit surface portion 71 has a rectangular shape. The number of parts 72 increases. For example, the number of ridges 72 branching from one intersection 75 in the uneven portion 70 shown in FIG. 8 is four, but the uneven portion 70 shown in FIG. 10 branches from one intersection 75. The number of ridges 72 is six.

Therefore, the uneven portion 70 shown in FIG. 10 is formed in the other ridge line portion 72 with respect to the void A formed in the certain ridge line portion 72 as compared with the uneven portion 70 shown in FIG. A large number of gaps A can be communicated with each other. As a result, in the shoulder portion 4 provided with the uneven portion 70 shown in FIG. 10, even if a certain flow path is blocked, it is possible to further facilitate the flow of air through the other flow path. , The air flow path can be secured more reliably.

Further, in the uneven portion 70 shown in FIG. 10, the area of the unit surface portion 71 is smaller and the number of ridge line portions 72 is larger than that of the uneven portion 70 shown in FIG. For this reason, the shoulder portion 4 provided with the uneven portion 70 shown in FIG. 10 is likely to diffuse and reflect light to increase its brilliance, and has a shape close to a smooth curved surface with small undulations, thereby improving the aesthetic appearance. Can be done.

The uneven portion 70 shown in FIG. 8 has a larger area of the unit surface portion 71 than the uneven portion 70 shown in FIG. Therefore, the shoulder portion 4 provided with the uneven portion 70 shown in FIG. 8 has a shape similar to a angular polyhedron having large undulations. As a result, in the shoulder portion 4 provided with the uneven portion 70 shown in FIG. 8, the ridgeline portion 72 of the inner container 20 tends to be the starting point of the contraction deformation of the inner container 20, and the inner container 20 is peeled off from the outer container 10. It can be made easier.

As described above, it is preferable that a plurality of unit surface portions 71 having a geometric shape are arranged in the multiple container 1 so as to show an appearance in which a three-dimensional geometric pattern is provided on the shoulder portion 4. Is. However, if the multi-container 1 can easily separate the outer container 10 and the inner container 20 at the shoulder portion 4 and an air flow path can be surely secured between them, the unit surface portion 71 having a random shape has a random shape. May be consecutively arranged in plurality.

[Detailed configuration of the body]
FIG. 12 is an enlarged perspective view of the vicinity of the body portion 5 shown in FIG. FIG. 13 is an enlarged side view of the vicinity of the body portion 5 shown in FIG.

As shown in FIGS. 12 and 13, the body portion 5 of the multilayer container 1 is formed so that the vicinity of the central portion thereof forms a drum shape that is curved inward in the radial direction. Specifically, the body portion 5 has a smaller radial dimension from the upper end portion 51a of the body portion 5 connected to the shoulder portion 4 downward, and is located near the central portion located between the upper end portion 51a and the lower end portion 52a. Is formed so as to form the innermost 53 having the smallest radial dimension. Further, the body portion 5 of the multiple container 1 is formed so that the radial dimension becomes larger from the innermost portion 53 toward the lower side and forms the outermost 54 having the largest radial dimension at the lower end portion 52a. The outermost 54 is the portion of the multilayer container 1 that bulges most outward in the radial direction.

An upper bead 55 and a lower bead 56 are provided on the upper 51 and the lower 52 of the body portion 5 of the multilayer container 1. Each of the upper bead 55 and the lower bead 56 is formed so as to be recessed inward in the radial direction and extend in the circumferential direction. Specifically, the upper bead 55 is provided at the upper end portion 51a of the body portion 5 connected to the shoulder portion 4. The lower bead 56 is provided near the lower end portion 52a of the body portion 5 that is connected to the heel portion 62. The upper bead 55 and the lower bead 56 are provided so that the innermost 53 is located at the intermediate portion between the upper bead 55 and the lower bead 56. The upper bead 55 and the lower bead 56 can increase the rigidity in the vicinity of the upper end portion 51a and the lower end portion 52a of the body portion 5.

Each of the upper bead 55 and the lower bead 56 is provided at a plurality of positions at intervals in the vertical direction. The upper bead 55 shown in FIG. 12 includes a first upper bead 55a connected to the shoulder portion 4 and a second upper bead 55b located below the first upper bead 55a. The lower bead 56 shown in FIG. 12 includes a first lower bead 56a connected to the heel portion 62 and a second lower bead 56b located above the first lower bead 56a. The second upper bead 55b and the second lower bead 56b are formed so as to be recessed inward in the radial direction with respect to the first upper bead 55a and the first lower bead 56a.

By the way, in the multiple container 1, the body portion 5 of the outer container 10 is formed so as to bend inward and deform when pressed by the squeeze operation, and to be restored to the original shape before pressing when the pressing is released. If the body of the outer container is not reliably restored when this pressing is released, the pressing pressure will not be transmitted to the inner container even if the squeeze operation is performed again, which may hinder the smooth ejection of the contents. There is sex.

In particular, when a large amount of contents are quickly poured out by one squeeze operation, the pressing force applied by the squeeze operation becomes large, so a large force is locally applied to the pressed portion of the body of the outer container. Is added, and there is a possibility that traces of plastic deformation and depression will remain. Therefore, it is important that the body portion 5 of the outer container 10 is quickly and surely restored when the pressing by the squeeze operation is released.

Therefore, the body portion 5 of the multiple container 1 is provided with an uneven portion 80 so that the outer container 10 can be reliably restored when the pressure is released by the squeeze operation.

As shown in FIG. 12, the uneven portion 80 has irregularities in the radial direction and is formed in the vertical direction and the circumferential direction. The uneven portion 80 does not have the shape of the body portion 5 itself as a polyhedron shape, but has an appearance in which a three-dimensional geometric pattern is provided on the body portion 5 having a cross-sectional shape close to a circle or an ellipse. Formed as shown.

The uneven portion 80 is provided in the region between the upper bead 55 and the lower bead 56 in the body portion 5. The uneven portion 80 is provided in the body portion 5 so as to be connected to the upper bead 55 and the lower bead 56 not directly but via the upper flat portion 57 and the lower flat portion 58. The uneven portion 80 shown in FIG. 12 is connected in the order of the second upper bead 55b and the first upper bead 55a via the upper flat portion 57, and the second lower bead 56b and the second lower bead 56b and the second via the lower flat portion 58. 1 The lower beads 56a are provided in this order. The upper flat portion 57 and the lower flat portion 58 are smooth curved surfaces.

Specifically, the uneven portion 80 includes a unit surface portion 81, a ridge line portion 82, and an intersection 85, as shown in FIGS. 12 and 13.

The unit surface portion 81 corresponds to each geometrically shaped surface that constitutes the geometric pattern. Specifically, the unit surface portion 81 has a geometric shape such as a polygonal shape or an arc shape. The uneven portion 80 shown in FIG. 12 is formed in a so-called diamond cut shape, and the unit surface portion 81 thereof has a polygonal shape such as an isosceles triangle. A plurality of unit surface portions 81 are continuously arranged in the direction from the shoulder portion 4 to the bottom portion 6, that is, in the vertical direction, and a plurality of unit surface portions 81 are continuously arranged in the circumferential direction.

A plurality of unit surface portions 81 may be arranged in the same geometric shape, or a plurality of combinations of several geometric shapes may be arranged. A plurality of the unit surface portions 81 shown in FIG. 12 are arranged so that the orientations of the unit surface portions 81 adjacent to each other in the vertical direction are staggered and the orientations of the unit surface portions 81 adjacent to each other in the circumferential direction are staggered.

The ridge line portion 82 corresponds to a boundary portion between geometrically shaped surfaces constituting the geometric pattern. Specifically, the ridge line portion 82 is formed by a boundary portion between adjacent unit surface portions 81. The ridge line portion 82 includes a first ridge line portion 83 extending in the direction from the shoulder portion 4 to the bottom portion 6, that is, in the vertical direction, and a second ridge line portion 84 extending in the circumferential direction. The ridge line portion 82 is formed in a mesh shape so as to cover the body portion 5 in the circumferential direction and the vertical direction.

The first ridge line portion 83 is formed by arranging two unit surface portions 81 adjacent to each other in the circumferential direction with the first ridge line portion 83 as a boundary so as to bring their inner surfaces close to each other. The first ridge line portion 83 is formed so as to project outward in the radial direction from the two unit surface portions 81 adjacent to each other in the circumferential direction with the first ridge line portion 83 as a boundary. The first ridge line portion 83 is formed so as to extend in the direction from the shoulder portion 4 to the bottom portion 6 while being inclined obliquely with respect to the axial direction.

The second ridge line portion 84 is formed by arranging two unit surface portions 81 adjacent to each other in the vertical direction with the second ridge line portion 84 as a boundary so as to bring their outer surfaces close to each other. The second ridge line portion 84 is formed so as to project inward in the radial direction from the two unit surface portions 81 adjacent in the vertical direction with the second ridge line portion 84 as a boundary.

The intersection 85 corresponds to the intersection of the boundary portions of the geometrically shaped surfaces forming the geometric pattern. Specifically, the intersection 85 is a portion where the ridges 82 intersect with each other. The intersection 85 is formed by the intersection of the first ridge line portion 83 and the second ridge line portion 84.

With such a configuration, in the body portion 5 of the multiple container 1, the ridge line portion 82 of the outer container 10 is more easily bent than the unit surface portion 81, and the pressing force applied by the squeeze operation is applied to the periphery of the pressed portion. It can be transmitted quickly. That is, in the body portion 5 of the multiple container 1, the ridge line portion 82 of the outer container 10 can disperse the pressing force applied by the squeeze operation to the surroundings, and expands the region elastically deformed with respect to the pressing force. Can be done.

In particular, in the multilayer container 1, even if it is made of polyethylene terephthalate resin, which has lower flexibility than polyolefin resin or the like, the ridge line portion 82 can disperse the pressing force to the surroundings, so that the pressing force is elastically deformed with respect to the pressing force. The area to be used can be expanded.

For this reason, in the body portion 5 of the multiple container 1, it is possible to prevent a large force from being locally applied to the pressed portion by the squeeze operation, so that the pressed portion or its vicinity is unintentionally plastically deformed. , It is possible to prevent the traces of depression and habits from remaining. As a result, in the body portion 5 of the multiple container 1, the outer container 10 can be reliably restored when the pressing by the squeeze operation is released.

In addition, in the body portion 5 of the multiple container 1, the pressing force is dispersed to the surroundings to expand the elastic deformation region, so that local deformation can be suppressed and the amount of deformation inward in the radial direction is reduced. , The amount of radial outward deformation required for restoration can be reduced. As a result, in the body portion 5 of the multiple container 1, the outer container 10 can be quickly and surely restored when the pressing by the squeeze operation is released.

Further, in the body portion 5 of the multiple container 1, the ridge line portion 82 of the outer container 10 is composed of a ridge line portion 82 extending in two directions of a first ridge line portion 83 and a second ridge line portion 84 that intersect each other. Therefore, in the body portion 5 of the multiple container 1, the pressing force applied by the squeeze operation can be dispersed over a wide range in the vertical direction and the circumferential direction, and the region elastically deformed with respect to the pressing force can be spread over a wide range. Can be expanded. Therefore, in the body portion 5 of the multiple container 1, the outer container 10 can be restored more quickly and reliably when the pressing by the squeeze operation is released.

Further, in the body portion 5 of the multilayer container 1, the uneven portion 80 is provided in the region between the high-rigidity upper bead 55 and the lower bead 56. Therefore, in the multiple container 1, the pressing force applied by the squeeze operation is suppressed from being transmitted to the shoulder portion 4 or the heel portion 62 beyond the region between the upper bead 55 and the lower bead 56. be able to. That is, in the body portion 5 of the multiple container 1, the region elastically deformed with respect to the pressing force applied by the squeeze operation can be limited to the region between the upper bead 55 and the lower bead 56.

Therefore, in the multiple container 1, it is possible to suppress the occurrence of unintended deformation due to the squeeze operation in the region where the uneven portion 80 is not provided, such as the shoulder portion 4 or the heel portion 62. For example, when the body portion 5 is pressed by a squeeze operation, the shoulder portion 4 or the heel portion 62 on which the uneven portion 80 is not provided is unintentionally bent and plastically deformed, and is folded into the shoulder portion 4 or the heel portion 62. It is possible to prevent the trace of habits from remaining. As a result, in the multiple container 1, the outer container 10 can be reliably restored when the pressing by the squeeze operation is released.

In addition, in the multi-vessel 1, the upper bead 55 and the lower bead 56 extending in the circumferential direction can increase the repulsive force against the pressing force applied by the squeeze operation, so that the radial outward force required for restoration is obtained. Can be increased. As a result, in the multiple container 1, the outer container 10 can be quickly and surely restored when the pressing by the squeeze operation is released.

Further, in the body portion 5 of the multilayer container 1, the uneven portion 80 is provided so as to be connected to the upper bead 55 and the lower bead 56 via the upper flat portion 57 and the lower flat portion 58. Therefore, in the multilayer container 1, it is possible to suppress locally applying a large force to the connecting portion between the upper bead 55 or the lower bead 56 and the uneven portion 80, so that the connecting portion is unintentionally plastic. It is possible to prevent the deformation and leaving traces such as bending habits. As a result, in the multiple container 1, the outer container 10 can be restored more quickly and reliably when the pressing force by the squeeze operation is released.

Further, in the body portion 5 of the multiple container 1, the uneven portion 80 is connected in the order of the second upper bead 55b and the first upper bead 55a via the upper flat portion 57, and the second lower portion via the lower flat portion 58. The side beads 56b and the first lower bead 56a are provided in this order. The second upper bead 55b and the second lower bead 56b are formed so as to be recessed inward in the radial direction with respect to the first upper bead 55a and the first lower bead 56a. Therefore, in the body portion 5 of the multiple container 1, it is possible to further suppress the application of a large force locally to the connecting portion between the upper bead 55 or the lower bead 56 and the uneven portion 80, and thus this connecting portion. However, it is possible to further prevent the plastic deformation from being unintentional and leaving traces such as bending habits. As a result, in the multiple container 1, the outer container 10 can be restored more quickly and reliably when the pressing force by the squeeze operation is released.

FIG. 14 is a perspective view for explaining another form of the uneven portion 80 provided on the body portion 5. FIG. 15 is a side view in which the uneven portion 80 shown in FIG. 14 is drawn in a line diagram.

The uneven portion 80 shown in FIG. 12 is formed in a so-called diamond cut shape, and a plurality of triangular unit surface portions 81 are continuously arranged in each of the vertical direction and the circumferential direction, and the ridge line portion 82 is in the vertical direction. And extends in the circumferential direction and includes the intersection 85.

On the other hand, the uneven portion 80 shown in FIG. 14 is composed of the concave rib 86. The concave rib 86 is recessed inward in the radial direction, extends in the direction from the shoulder portion 4 to the bottom portion 6, that is, in the vertical direction, and is formed at a plurality of locations along the circumferential direction. Since the concave rib 86 can increase the rigidity of the body portion 5 in the vertical direction, the compressive strength of the body portion 5 in the vertical direction can be increased.

Each of the plurality of concave ribs 86 includes a concave portion 87 located on the inner side in the radial direction and a convex portion 88 located on the outer side in the radial direction. In the uneven portion 80 shown in FIG. 14, the unit surface portion 81 is formed by the concave portion 87, and the ridge line portion 82 is formed by the convex portion 88.

In the body portion 5 provided with the uneven portion 80 shown in FIG. 14, the peripheral length of the body portion 5 is longer than in the case where the uneven portion 80 is not provided, so that the pressing force applied by the squeeze operation is applied. Can be dispersed in the surroundings, and the region elastically deformed with respect to the pressing force can be expanded. Therefore, in the body portion 5 provided with the uneven portion 80 shown in FIG. 14, it is possible to suppress the application of a large force locally and to prevent the traces of depression and creases from remaining. it can. As a result, in the body portion 5 provided with the uneven portion 80 shown in FIG. 14, the outer container 10 can be reliably restored when the pressing by the squeeze operation is released.

In addition, in the body portion 5 provided with the uneven portion 80 shown in FIG. 14, the pressing force is dispersed to the surroundings to expand the elastic deformation region, so that local deformation can be suppressed and within the radial direction. Since the amount of deformation in the direction is small, the amount of deformation in the radial direction required for restoration can be reduced. As a result, in the body portion 5 provided with the uneven portion 80 shown in FIG. 14, the outer container 10 can be quickly and surely restored when the pressing by the squeeze operation is released.

[Detailed composition of heel part]
FIG. 16 is an enlarged perspective view of the vicinity of the heel portion 62 shown in FIG. FIG. 17 is an enlarged side view of the vicinity of the heel portion 62 shown in FIG.

The heel portion 62 of the multiple container 1 is a portion that extends downward from the lower end portion 52a of the body portion 5 and is connected to the ground contact portion 61. In the multiple container 1, the lower end portion 52a of the body portion 5 forms the outermost 54 that bulges outward in the radial direction in the multiple container 1. That is, it can be said that the heel portion 62 of the multiple container 1 is a portion connected from the outermost 54 to the ground contact portion 61. In the multiple container 1 shown in FIG. 16, the heel portion 62 is formed so that the radial dimension becomes smaller from the outermost 54 toward the lower side.

The multi-container 1 may collide with another multi-container 1 when being conveyed by a belt conveyor or the like after the content filling step, but the collision point with the other multi-container 1 is outside the radial direction. It tends to be the outermost 54 that bulges most toward the side. In the multiple container 1, if the outermost 54 is provided at a relatively low position of the lower end portion 52a of the body portion 5, the center of gravity of the multiple container 1 becomes lower and the collision point with the other multiple containers 1 becomes a lower position. Therefore, it may be difficult to tip over during transportation.

By the way, in the multiple container 1, after biaxial stretching blow molding as described above, a peeling step and a restoration step are performed, the inner container 20 is contracted so as to be peeled from the outer container 10, and then expanded, and the outer container 10 is expanded. It is restored to the shape along.

However, since the heel portion of the multiple container is a portion that is far from the mouth portion into which air is blown in the restoration step and is connected to the ground contact portion, it may be difficult to uniformly restore the inner container in the restoration step. For this reason, in the heel portion of the multiple container, it is difficult to reliably secure an air flow path between the inner container and the outer container, and the inner container is outside with air remaining between the inner container and the outer container. It may be in close contact with the container. In particular, when the radial dimension of the heel portion becomes smaller from the outermost side toward the lower side, in the heel portion, the air between the inner container and the outer container tends toward the body when the inner container expands in the restoration process. Since it is difficult to distribute to the air, air tends to remain between the inner container and the outer container. As a result, in a multiple container, the volume of the inner container may vary from container to container.

Therefore, the heel portion 62 of the multiple container 1 is provided with an uneven portion 90 so that an air flow path is secured between the outer container 10 and the inner container 20.

As shown in FIG. 16, the uneven portion 90 has irregularities in the radial direction and is formed in the vertical direction and the circumferential direction. The uneven portion 90 does not have beads, ribs, grooves, or the like formed on the heel portion 62, or the shape of the heel portion 62 itself is a polyhedral shape, but the heel portion 62 having a cross-sectional shape close to a circular or elliptical shape. On the other hand, it is formed so as to show an appearance as if a three-dimensional geometric pattern is provided.

Specifically, the uneven portion 90 includes a unit surface portion 91, a ridge line portion 92, and an intersection portion 95, as shown in FIGS. 16 and 17.

The unit surface portion 91 corresponds to each geometrically shaped surface that constitutes the geometric pattern. Specifically, the unit surface portion 91 has a geometric shape such as a polygonal shape or an arc shape. The unit surface portion 91 shown in FIG. 16 has a polygonal shape such as a triangle. A plurality of unit surface portions 91 are continuously arranged in the direction from the body portion 5 to the ground contact portion 61, that is, in the vertical direction, and a plurality of unit surface portions 91 are continuously arranged in the circumferential direction.

A plurality of unit surface portions 91 may be arranged in the same geometric shape, or a plurality of combinations of several geometric shapes may be arranged. The unit surface portion 91 shown in FIG. 16 is composed of a combination of several triangles, and the orientations of the unit surface portions 91 adjacent to each other in the vertical direction are staggered, and the orientations of the unit surface portions 91 adjacent to each other in the circumferential direction are Multiple arrangements are made so that they are the same.

The ridge line portion 92 corresponds to a boundary portion between geometrically shaped surfaces constituting the geometric pattern. Specifically, the ridge line portion 92 is formed by a boundary portion between adjacent unit surface portions 91. The ridge line portion 92 includes a first ridge line portion 93 extending in the direction from the body portion 5 toward the ground contact portion 61, that is, in the vertical direction, and a second ridge line portion 94 extending in the circumferential direction. The ridge line portion 92 is formed in a mesh shape so as to cover the heel portion 62 in the circumferential direction and the vertical direction.

The first ridge line portion 93 is formed by arranging two unit surface portions 91 adjacent to each other in the circumferential direction with the first ridge line portion 93 as a boundary so as to bring their inner surfaces close to each other. The first ridge line portion 93 is formed so as to project outward in the radial direction from the two unit surface portions 91 adjacent to each other in the circumferential direction with the first ridge line portion 93 as a boundary. The first ridge line portion 93 is formed so as to extend in a direction from the body portion 5 toward the ground contact portion 61 while being inclined obliquely with respect to the axial direction.

The second ridge line portion 94 is formed by arranging two unit surface portions 91 that are vertically adjacent to each other with the second ridge line portion 94 as a boundary so that their outer surfaces come close to each other. The second ridge line portion 94 is formed so as to project inward in the radial direction from the two unit surface portions 91 adjacent in the vertical direction with the second ridge line portion 94 as a boundary.

The intersection 95 corresponds to an intersection between the boundaries of the geometrically shaped surfaces that form the geometric pattern. Specifically, the intersection 95 is a portion where the ridges 92 intersect with each other. The intersection 95 is formed by the intersection of the first ridge line portion 93 and the second ridge line portion 94.

With such a configuration, in the heel portion 62 of the multiple container 1, the inner container 20 is provided so that the outer surface of the ridgeline portion 92 of the inner container 20 is completely in close contact with the inner surface of the ridgeline portion 92 of the outer container 10 in the restoration step. Very unlikely to be restored. Therefore, in the uneven portion 90, at least the ridge line portion 92 can form a gap A as an air flow path between the outer container 10 and the inner container 20 in the heel portion 62. That is, in the heel portion 62 of the multiple container 1, by providing the uneven portion 90, a gap A can be formed at least between the outer container 10 and the inner container 20 at the ridgeline portion 92, so that the air flow path is ensured. Can be secured. Therefore, in the multiple container 1, it is possible to prevent the outer container 10 and the inner container 20 from being partially in close contact with each other in the restoration step, and it is possible to prevent the volume of the inner container from fluctuating among the containers.

In particular, in the multiple container 1, even if it is made of polyethylene terephthalate resin, which is less flexible than the polyolefin resin or the like, the void A can be formed in the ridge line portion 92, so that the air flow path is surely made in the heel portion 62. Can be secured. Therefore, in the multiple container 1, it is possible to prevent the outer container 10 and the inner container 20 from being partially in close contact with each other in the restoration step, and it is possible to prevent the volume of the inner container from fluctuating among the containers.

Further, in the heel portion 62 of the multiple container 1, the ridgeline portion 92 of the inner container 20 is composed of a ridgeline portion 92 extending in two directions of a first ridgeline portion 93 and a second ridgeline portion 94 intersecting each other. Therefore, in the heel portion 62 of the multiple container 1, the gap A formed in a certain first ridge line portion 93 extending in the vertical direction is passed through the gap A formed in the second ridge line portion 94 extending in the circumferential direction. It can communicate with the void A formed in the other first ridge line portion 93 extending in the vertical direction. As a result, in the heel portion 62 of the multiple container 1, even if a certain flow path extending in the vertical direction is blocked, air can be passed through the other flow path extending in the vertical direction through the flow path extending in the circumferential direction. Can be distributed. Therefore, the heel portion 62 of the multiple container 1 can more reliably secure the air flow path. Therefore, in the multiple container 1, it is possible to further suppress that the outer container 10 and the inner container 20 are in a partially adhered state in the restoration step, and further suppress that the volume of the inner container varies from container to container. ..

Further, in the multiple container 1, the heel portion 62 is a portion that is continuous from the outermost 54 that bulges outward in the radial direction to the ground contact portion 61, and the radial dimension is smaller than the outermost 54. Even if the radial dimension of the heel portion 62 is smaller than the outermost 54, the multi-container 1 can reliably secure an air flow path in the heel portion 62 by providing the uneven portion 90. Therefore, in the multiple container 1, even if the radial dimension of the heel portion 62 is smaller than the outermost 54, it is possible to prevent the outer container 10 and the inner container 20 from being partially in close contact with each other in the restoration step. , It is possible to prevent the volume of the inner container from fluctuating from one container to another.

As described above with reference to FIGS. 14 and 15, concave ribs 86, which are recessed inward in the radial direction and extend in the direction from the shoulder portion 4 to the bottom portion 6, extend in the circumferential direction in the body portion 5 of the multiple container 1. May be provided in plurality. As a result, in the multiple container 1, it is extremely unlikely that the inner container 20 will be restored so that the outer surface of the concave rib 86 of the inner container 20 is completely in close contact with the inner surface of the concave rib 86 of the outer container 10 in the restoration step. In addition, in the multiple container 1, since the pressing force applied by the squeeze operation can be dispersed to the surroundings, the outer container 10 can be reliably restored when the pressing force by the squeeze operation is released, and the air can be reliably restored. Air can be reliably introduced from the introduction unit 30. As a result, in the multiple container 1, air can be easily circulated between the outer container 10 and the inner container 20 in the heel portion 62, and the outer container 10 and the inner container 20 are partially in close contact with each other in the heel portion 62. It is possible to further suppress the state of being in the state of being in the state.

As described above, it is preferable that a plurality of unit surface portions 91 having a geometric shape are arranged in the multiple container 1 so as to show an appearance in which a three-dimensional geometric pattern is provided on the heel portion 62. Is. However, in the multiple container 1, if a flow path of air can be surely secured between the outer container 10 and the inner container 20 in the heel portion 62, a plurality of randomly shaped unit surface portions 91 are continuously arranged. You may be.

[Other Embodiments]
In the above-described embodiment, the multiple container 1 is a container in which the outer container 10 constitutes the outer shell of the multiple container 1 and the inner container 20 contains the contents. However, the multiple container 1 is not limited to a container in which the outer container 10 constitutes the outer shell of the multiple container 1 and the inner container 20 accommodates the contents. That is, in the multiple container 1, the container forming the outer shell of the multiple container 1 may be provided further outside the outer container 10, or the container for accommodating the contents may be provided further inside the inner container 20. In this way, the multiple container 1 may function as a laminate in which the outer container 10 and the inner container 20 are flankably laminated adjacent to each other and form a gap A between them, as a matter of course. It may be a container having a triple or more multiple structure capable of forming a plurality of voids A.

[Other]
In the above-described embodiment, the multiple container 1 corresponds to an example of the "multiple container" described in the claims. The outer container 10 corresponds to an example of the “outer container” described in the claims. The inner container 20 corresponds to an example of the "inner container" described in the claims. The shoulder portion 4 corresponds to an example of the “shoulder portion” described in the claims. The body portion 5 corresponds to an example of the “body portion” described in the claims. The bottom 6 corresponds to an example of the "bottom" described in the claims. The air introduction unit 30 corresponds to an example of the “air introduction unit” described in the claims. The upper part 51 and the lower part 52 correspond to an example of the "upper part" and the "lower part" described in the claims. The upper bead 55 and the lower bead 56 correspond to an example of the "upper bead" and the "lower bead" described in the claims. The uneven portion 80 corresponds to an example of the “uneven portion” described in the claims. The unit surface portion 81 corresponds to an example of the “unit surface portion” described in the claims. The ridge line portion 82 corresponds to an example of the “ridge line portion” described in the claims. The first ridge line portion 83 corresponds to an example of the “first ridge line portion” described in the claims. The second ridge line portion 84 corresponds to an example of the “second ridge line portion” described in the claims. The intersection 85 corresponds to an example of the “intersection” described in the claims. The concave rib 86 corresponds to an example of the “concave rib” described in the claims. The recess 87 corresponds to an example of the "recess" described in the claims. The convex portion 88 corresponds to an example of the “convex portion” described in the claims.

In the above-described embodiments, the techniques can be applied to each other, including modifications. The above-described embodiment does not limit the content of the present invention, and changes can be made without departing from the scope of claims.

The terms used in the above embodiments and claims should be construed as non-limiting terms. For example, the term "contains" should be construed as "not limited to what is described as including." The term "contains" should be construed as "not limited to what is described as containing." The term "prepared" should be construed as "not limited to what is described as prepared." The term "have" should be construed as "not limited to what is described as having."

1 Multiple container 3 Mouth 4 Shoulder 5 Body 6 Bottom 10 Outer container 11 Opening 12 Ridge 13 Mounted part 14 Support ring 15 Steps 16 Lower 20 Inner container 21 Opening 22 Ridge 23 Ring 24 Lower 30 Air inlet 31 1st slit 32 2nd slit 33 Groove 51 Upper 51a Upper end 52 Lower 52a Lower end 53 Innermost 54 Outermost 55 Upper bead 55a 1st upper bead 55b 2nd upper bead 56 Lower bead 56a 1st Lower bead 56b 2nd lower bead 57 Upper flat part 58 Lower flat part 61 Grounding part 62 Heel part 70 Uneven part 71 Unit surface part 72 Ridge part 73 1st ridge part 74 2nd ridge part 75 Crossing part 80 Uneven part 81 Unit surface 82 Ridge 83 1st ridge 84 2nd ridge 85 Intersection 86 Concave rib 87 Concave 88 Convex 90 Concavo-convex 91 Unit surface 92 Ridge 93 1st ridge 94 2nd ridge 95 Intersection A void S accommodation space Z central axis

Claims (6)

A bottle-shaped multiple container in which an inner container that shrinks as the contents decrease and an outer container that contains the inner container are laminated so as to be peelable.
The body of the multi-layer container is provided with irregularities formed in the radial direction and formed in the circumferential direction.
The uneven portion is
A unit surface portion that forms a geometric shape and is continuously arranged in the circumferential direction,
A multi-layer container characterized by including a ridge portion formed by a boundary portion between adjacent unit surface portions. The body of the outer container is formed so as to be elastically deformable with respect to the pressing force applied by the squeeze operation.
The multiple container according to claim 1, wherein the uneven portion expands a region of elastic deformation in the body portion of the outer container by dispersing the pressing force at the ridge line portion. An upper bead and a lower bead extending in the circumferential direction are provided on the upper part and the lower part of the body portion, respectively.
The multiple container according to claim 2, wherein the uneven portion is provided in a region between the upper bead and the lower bead. The uneven portion is
Further including an intersection where the ridges intersect with each other,
The unit surface portions form a polygonal shape, and a plurality of unit surface portions are continuously arranged in the direction from the shoulder portion to the bottom portion of the multiple container.
The ridgeline portion includes a first ridgeline portion extending in the direction from the shoulder portion toward the bottom portion and a second ridgeline portion extending in the circumferential direction.
The multiple container according to any one of claims 1 to 3, wherein the intersection is formed by the intersection of the first ridge line portion and the second ridge line portion. The uneven portion is
It is composed of concave ribs that are recessed inward in the radial direction and extend in the direction from the shoulder to the bottom of the multiple container.
The unit surface portion is formed by a recess located radially inside the concave rib.
The multiple container according to any one of claims 1 to 3, wherein the early ridge line portion is formed by a convex portion located on the radial outer side of the concave rib. The multiple container according to any one of claims 1 to 5, wherein the inner container and the outer container are made of polyethylene terephthalate resin.