JP7205118B2 - Double container and its manufacturing method - Google Patents

Description

The present invention relates to a double container and its manufacturing method.

Double containers called delamination bottles, airless bottles, delamination containers, etc. are known as containers for storing contents such as liquid seasonings or liquid cosmetics and maintaining their freshness (for example, Patent Document 1 ).

JP 2017-196822 A

In Patent Document 1, in order to form a gap 17 between the portion of the inner container body 12 that is connected to the inner opening 11 and the shoulder portion 5 of the outer bottle 2, a pressing force F is applied to the inner opening 11 from above. is applied and pressed to push the inner mouth portion 11 into the interior of the multiple bottle 1. The technique of pushing the inner mouth portion 11 into the inside of the multiple bottle 1 cannot be easily introduced into the manufacturing process of the multiple bottle 1 because the blow molding machine that can implement this is limited and a special process is added. Therefore, with the technique described in Patent Document 1, it is not easy to separate the portion of the inner container main body 12 connected to the inner mouth portion 11 from the shoulder portion 5 of the outer bottle 2 . Therefore, with the technique described in Patent Document 1, it is difficult to smoothly contract the inner container body 12 with a simple configuration, and there is room for improvement in terms of pourability of the contents.

The present invention has been made in view of the circumstances described above, and an object thereof is to solve the problems described above. That is, one example of the object of the present invention is to provide a double container that can smoothly contract the inner container with a simple structure and appropriately pour out the contents.

A double container according to the present invention includes an inner container that accommodates a content and is contractable as the content decreases, and an outer air introduction hole that introduces outer air between the inner container and the inner container to enclose the inner container. A double container in which a bottle-shaped outer container and a bottle-shaped outer container are detachably laminated, wherein the outer container and the inner container are manufactured by blow molding, and at least one of the shoulder portion and the body portion has an outer A panel portion is provided that can be reversed between a bulging state and an inward bulging state, and the panel portion is provided between the outer container and the inner container in the panel portion after blow molding. As the inwardly bulging state is reversed to the outwardly bulging state, a flow path for the outside air introduced from the outside air introduction hole is formed.

Preferably, in the double container, at least one of the outer container and the inner container in the panel portion has a gap between the outer container and the inner container as the panel portion is turned over. A wrinkle forming a gap is generated, and the panel section forms the flow path for the outside air introduced from the outside air introduction hole by the gap formed by the wrinkle.

Preferably, in the double container, the panel section forms the flow path for the outside air as only the outer container is turned over.

Preferably, in the double container, the outside air introduction hole is provided in the mouth portion of the outer container, and the panel portion is provided in the shoulder portion.

Further, in the method for manufacturing a double container according to the present invention, an inner container which accommodates contents and can be contracted as the contents decrease, and an air introduction hole for introducing the outer air are provided between the inner container and the inner container. A method for manufacturing a double container in which a bottle-shaped outer container enclosing the inner container is detachably laminated, wherein the method can be reversed between an outwardly bulging state and an inwardly bulging state. a molding step of blow-molding the outer container and the inner container so that the panel portion is provided on at least one of the shoulder portion and the body portion; and a reversing step of reversing the panel portion so as to bulge outward.
Further, in the method for manufacturing a double container according to the present invention, an inner container which accommodates contents and can be contracted as the contents decrease, and an air introduction hole for introducing the outer air are provided between the inner container and the inner container. A method for manufacturing a double container in which a bottle-shaped outer container enclosing the inner container is detachably laminated, wherein the method can be reversed between an outwardly bulging state and an inwardly bulging state. A forming step of blow-molding the outer container and the inner container so that the panel portion is provided on at least one of the shoulder portion and the body portion; and sucking gas from the mouth portion of the inner container; A peeling step of shrinking the inner container molded in the molding step and peeling it off from the outer container by blowing gas through a hole; blowing gas from a mouth portion of the inner container; or A restoring step of expanding the inner container peeled by the peeling step and restoring the shape along the outer container by sucking gas from the panel, and a step performed as part of the restoring step, wherein the panel and a reversing step of reversing the panel portion so that the portion bulges in a different direction after the molding step.

Preferably, in the double container manufacturing method, in the reversing step, as the panel portion is reversed, air is introduced from the outside air introduction hole between the outer container and the inner container in the panel portion. A flow path for the introduced outside air is formed.

ADVANTAGE OF THE INVENTION The double container which concerns on this invention, and its manufacturing method can provide the double container which can shrink|contract an inner container smoothly with a simple structure, and can pour out a content appropriately.

FIG. 2 is a diagram schematically showing the external configuration of the double container according to Embodiment 1; 1. It is a figure which shows the longitudinal cross-section of the double container in the state in which the content accommodated in the double container shown by FIG. 1 was poured out and the inner container was contracted to some extent. It is the figure which looked at the double container shown by FIG. 1 from upper direction. FIG. 2 is a view showing a longitudinal section of the shoulder cut in a plane containing the KK line shown in FIG. 1; It is a figure for demonstrating the generation principle of wrinkles. 1. It is a figure for demonstrating the manufacturing method of the double container shown by FIG. FIG. 10 is a view showing a longitudinal section of the shoulder portion of the double container according to Embodiment 2, and is a view showing the longitudinal section of the shoulder portion after the panel portion is turned over.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, the direction along the central axis Z of the double container 1 having a bottle shape is also referred to as the "axial direction", and the direction in which the double container 1 revolves around the central axis Z as the rotation axis is also referred to as the "circumferential direction". The direction orthogonal to the central axis Z of the double container 1 is also called the "radial direction". Further, in the present embodiment, the axial direction from the mouth portion 3 to the bottom portion 6 of the double container 1 is also referred to as “downward”, and the axial direction from the bottom portion 6 to the mouth portion 3 of the double container 1 is also referred to as “upward”. . Further, in the present embodiment, a cross section obtained by cutting the double container 1 along a plane along the central axis Z of the double container 1 is also referred to as a “longitudinal section”, and A cross section obtained by cutting the heavy container 1 is also referred to as a "cross section".

[Embodiment 1: Configuration of double container]
FIG. 1 is a diagram schematically showing the external configuration of a double container 1 according to Embodiment 1. FIG. FIG. 2 is a longitudinal cross-sectional view of the double container 1 shown in FIG. 1 when the contents contained in the double container 1 have been poured out and the inner container 20 has contracted to some extent.

The double container 1 is a bottle-shaped container. As shown in FIG. 1, the double container 1 has a mouth portion 3 which is one end of the double container 1 and from which the contents are poured out, a bottom portion 6 which is the other end of the double container 1 and is grounded, It has a shoulder portion 4 extending downward from the mouth portion 3 while expanding radially outward, and a trunk portion 5 extending downward from the shoulder portion 4 and continuing to a bottom portion 6 .

As shown in FIG. 2, the double container 1 consists of a bottle-shaped outer container 10 that constitutes the outer shell of the double container 1 and contains an inner container 20, and a bottle-shaped outer container 10 that accommodates the contents and shrinks as the contents decrease. and a possible inner container 20 . The double container 1 is a container 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 outer container 10 and the inner container 20 are containers made of synthetic resin and manufactured by blow molding. Preferably, the outer container 10 and the inner container 20 are manufactured by biaxial stretch blow molding using test tube-shaped preforms. Specifically, the outer container 10 and the inner container 20 are formed by inserting the preform of the inner container 20 into the preform of the outer container 10 and stacking the preform of the outer container 10 and the preform of the inner container 20 . It is manufactured by simultaneously stretch-blow-molding the foam and the foam. Alternatively, the outer container 10 and the inner container 20 may be manufactured by stretch blow molding the preform of the outer container 10 and then stretch blow molding the preform of the inner container 20 inside the outer container 10 .

The outer container 10 and the inner container 20 are made of polyolefin resin, ethylene-vinyl copolymer, styrene resin, vinyl resin, polyamide resin, polyester resin, polycarbonate resin, polyphenylene oxide resin, or raw material. Manufactured using degradable resin. Preferably, the outer container 10 and the inner container 20 are manufactured using polyolefin resin or polyester resin. More preferably, the outer container 10 and the inner container 20 are manufactured using a polyester-based resin. Examples of the polyester-based resin include resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and copolyester thereof. Particularly preferably, the outer container 10 and the inner container 20 are manufactured using polyethylene terephthalate resin.

The outer container 10 is formed so that the bottom portion 6 is grounded and self-supporting. The outer container 10 is formed so that the shapes of the mouth portion 3, the shoulder portion 4, the body portion 5 and the bottom portion 6 are maintained in a self-supporting state. The shoulder portion 4 and the body portion 5 of the outer container 10 are formed so as to bend and deform inwardly when pressed by a squeezing operation, and to restore their original shapes before being pressed when the pressing is released.

As shown in FIG. 2, the inner container 20 has a storage space S for storing contents and is formed to have a shape along the outer container 10 . The shoulder portion 4 and the body portion 5 of the inner container 20 are formed to have a thickness thinner than that of the outer container 10 so as to shrink as the contents decrease. The mouth portion 3 of the inner container 20 is formed so as not to shrink as the contents decrease and to have higher rigidity than the shoulder portion 4 and the body portion 5 .

The mouth portion 3 of the outer container 10 is provided with an outside air introduction hole 11 for introducing outside air between the outer container 10 and the inner container 20 . The outside air introduction hole 11 is provided so as to communicate with the gap A1 and the air layer A2, as shown in FIG. The gap A1 is a space located between the mouth portion 3 of the outer container 10 and the mouth portion 3 of the inner container 20 . The air layer A2 is a space formed between the shoulder portion 4 and the bottom portion 6 of the outer container 10 and the shoulder portion 4 and the bottom portion 6 of the inner container 20 when the outer container 10 and the inner container 20 are separated. be.

The mouth portion 3 of the inner container 20 is arranged so as to be exposed upward from the upper end portion of the mouth portion 3 of the outer container 10 and fixed to the mouth portion 3 of the outer container 10 . Caps with check valves are attached to the outer surfaces of the mouth portions 3 of the outer container 10 and the inner container 20 . The cap is attached so as to cover the outside air introduction hole 11 from the outside in the radial direction.

[Embodiment 1: Structure of shoulder portion of double container]
FIG. 3 is a top view of the double container 1 shown in FIG. FIG. 4 is a view showing a longitudinal section of the shoulder 4 taken along a plane containing the line KK shown in FIG. FIG. 4(a) shows a longitudinal section of the shoulder portion 4 before the panel portion 40 is inverted. FIG. 4(b) shows a longitudinal section of the shoulder portion 4 after the panel portion 40 has been turned over.

The shoulder portion 4 of the double container 1 is provided with a panel portion 40 as shown in FIGS. The panel portion 40 is formed to have a substantially trapezoidal shape in which the upper base near the mouth portion 3 is shorter than the lower base. A plurality of panel portions 40 are evenly arranged in the circumferential direction. Each of the plurality of panel portions 40 is provided so as to spread radially when viewed from above.

The panel section 40 is a panel that can be reversed between an outwardly bulging state and an inwardly bulging state. The panel section 40 may be different from the vacuum absorbing panel. The pressure reduction absorption panel is a panel for absorbing the pressure acting on the container when the internal pressure of the container is reduced due to the volume reduction of the content filled at high temperature when the temperature of the content drops. The vacuum absorbing panel is characterized in that it deforms so as to bulge inward.

On the other hand, the panel portion 40 can be deformed so as to bulge outward as well as inward, and is configured to be reversed between the outward bulging state and the inward bulging state. panel. Specifically, immediately after the outer container 10 and the inner container 20 are blow-molded, as shown in FIG. It is formed in a state of bulging inward from the edge portion 42 which is the peripheral edge portion of 40 . Specifically, the panel portion 40 is molded such that the panel main body portion 41 bulges inward from a plane P<b>1 including the edge portion 42 . Thereafter, the panel portion 40 is deformed so that the panel main body portion 41 bulges outward as compared to the state immediately after the blow molding, as shown in FIG. do. Specifically, the panel portion 40 is deformed such that the panel body portion 41 bulges outward from the plane P1 including the edge portion 42 . Such deformation of the panel body 41 allows the panel 40 to be reversed between an outwardly bulging state and an inwardly bulging state. Note that the panel portion 40 may be provided so that the panel body portion 41 is symmetrical with respect to the plane P1 before and after the inversion.

At least one of the outer container 10 and the inner container 20 in the panel portion 40 has wrinkles 43 forming a gap A3 between the outer container 10 and the inner container 20 as the panel portion 40 is turned over. Occur. The gap A3 communicates with the gap A1 located between the mouth portion 3 of the outer container 10 and the mouth portion 3 of the inner container 20 . The gap A1 communicates with the outside air introduction hole 11 . That is, the panel portion 40 can form a flow path for outside air introduced from the outside air introduction hole 11 by the gap A3 formed by the wrinkles 43 . In other words, in at least one of the outer container 10 and the inner container 20 of the panel portion 40 , a flow path for outside air introduced from the outside air introduction hole 11 is formed as the panel portion 40 is turned upside down.

FIG. 5 is a diagram for explaining the principle of generation of wrinkles 43. As shown in FIG. FIG. 5(a) shows the state of the panel section 40 and its peripheral section 46 before the panel section 40 is turned over. FIG. 5(b) shows the state of the panel section 40 and its peripheral section 46 after the panel section 40 has been turned over.

In FIG. 5A, the panel main body 41 constituting the panel section 40 includes a top portion 44 that bulges upward in the plane of the paper, and a flat portion 45 that extends flat from the top portion 44 and continues to the edge portion 42. . The flat portion 45 is connected to a peripheral portion 46 which is a peripheral portion of the panel portion 40 and extends flat. At each of the top portion 44, the flat portion 45, the edge portion 42 and the peripheral portion 46, the outer container 10 and the inner container 20 are separated from each other before the panel portion 40 is turned over as shown in FIG. 5(a). Suppose we are in close contact.

From the state shown in FIG. 5(a), the top portion 44 and the flat portion 45 of the outer container 10 are turned upside down with the plane P2 passing through the middle of the thickness of the outer container 10 at the edge portion 42 as a reference. Similarly, from the state of FIG. 5( a ), the inner container 20 at the top portion 44 and the flat portion 45 is inverted with respect to the plane P3 passing through the middle of the wall thickness of the inner container 20 at the edge portion 42 . Then, the positions of the panel portion 40 and its peripheral portion 46 are adjusted so that the outer container 10 and the inner container 20 are brought into close contact with each other on the flat portion 45 after the reversal.

Then, the panel portion 40 and its peripheral portion 46 in FIG. 5(a) are brought into a state as shown in FIG. 5(b). In the state of FIG. 5(b), a gap A3 is formed between the outer container 10 and the inner container 20 at the top portion 44, the edge portion 42 and the peripheral portion 46. As shown in FIG. That is, in the panel part 40 and its peripheral part 46 of FIG. 5(a), the outer container 10 and the inner container 20 are in close contact with each other, but as the top part 44 and the flat part 45 are turned over, A gap A3 is generated between the outer container 10 and the inner container 20 in the panel portion 40 and its peripheral portion 46 in FIG. 5(b). This means that if the outer container 10 and the inner container 20 in the peripheral portion 46 are in close contact with each other before and after the top portion 44 and the flat portion 45 are turned over, the outer container 10 and the inner container 20 at the top portion 44, the flat portion 45 and the edge portion 42 after turning over are in close contact with each other. It means that at least one of the inner containers 20 undergoes buckling deformation such that wrinkles 43 are generated.

The outer container 10 and the inner container 20 have different surface areas and different wall thicknesses. In addition, there is a difference between the restoring force acting on the inverted outer container 10 and the restoring force acting on the inverted inner container 20 in the vicinity of the edge 42 of the panel portion 40, which is the base point for inversion. For this reason, it is extremely difficult to invert the outer container 10 and the inner container 20 in the panel portion 40 while maintaining a completely similar shape. Therefore, at least one of the outer container 10 and the inner container 20 in the panel portion 40 undergoes buckling deformation as the panel portion 40 is turned upside down, and wrinkles 43 are generated. In particular, since the inner container 20 is thinner than the outer container 10 and easily deformed, wrinkles 43 are likely to occur in the inner container 20 . The generated wrinkles 43 form a gap A3 between the outer container 10 and the inner container 20 . As a result, a gap A3 is formed between the outer container 10 and the inner container 20 in the panel portion 40 as the panel portion 40 is turned over. A gap A<b>3 formed by the wrinkles 43 functions as a flow path for outside air introduced from the outside air introduction hole 11 .

[Embodiment 1: Method for manufacturing a double container]
FIG. 6 is a diagram for explaining a method of manufacturing the double container 1 shown in FIG.

As a method of manufacturing the double container 1, first, a process of forming the outer container 10 and the inner container 20 is performed (step 601). In the molding process, first, preforms for the outer container 10 and the inner container 20 are molded by injection molding or the like. Next, the preform for the outer container 10 and the preform for the inner container 20 are formed into the outer container 10 and the inner container 20 by biaxial stretch blow molding, respectively. At this time, the outer container 10 and the inner container 20 immediately after the blow molding are molded so that the panel portion 40 provided on the shoulder portion 4 bulges inward as shown in FIG. 4(a). be done.

After that, as a method of manufacturing the double container 1, a peeling process is performed in which the inner container 20 molded in the molding process is shrunk and peeled off from the outer container 10 (step 602). In the peeling step, a gas such as air is sucked from the mouth portion 3 of the molded inner container 20, or a gas such as air is blown into the space between the outer container 10 and the inner container 20 from the outside air introduction hole 11. , the inner container 20 is separated from the outer container 10 .

After that, as a method of manufacturing the double container 1, a restoring process is performed in which the peeled inner container 20 is expanded and restored to a shape along the outer container 10 (step 603). In the restoring process, the inner container 20 is restored by blowing gas such as air into the inner container 20 from the mouth portion 3 of the peeled inner container 20 or sucking gas such as air from the outside air introduction hole 11. Let At this time, in the restoring process, not only is the inner container 20 expanded along the outer container 10, but also the outer container 10 and the inner container 20 in the panel portion 40 are expanded outward as shown in FIG. 4(b). Blowing from the mouth portion 3 or suction from the outside air introduction hole 11 is performed until it inverts so as to swell. By turning over the panel portion 40, wrinkles 43 are formed in at least one of the outer container 10 and the inner container 20 of the shoulder portion 4, and a gap A3 is formed. This gap A3 functions as a flow path for outside air introduced from the outside air introduction hole 11 .

As described above, in the method for manufacturing the double container 1, the reversing step 603a for reversing the panel portion 40 so that the panel portion 40 bulges in a different direction from that after the molding step is performed as part of the restoring step. will be In the method for manufacturing the double container 1, as the panel portion 40 is turned over, the outside air introduced from the outside air introduction hole 11 flows between the outer container 10 and the inner container 20 in the panel portion 40. can be formed.

[Embodiment 1: Effects]
As described above, in the double container 1 according to Embodiment 1, the panel portion 40 that can be reversed between the outwardly bulging state and the inwardly bulging state, and is different from the pressure-reduction absorption panel, is the shoulder portion 4 . provided in Therefore, in the double container 1 according to Embodiment 1, the inner container 20 in the panel portion 40 can be easily separated from the outer container 10 as the panel portion 40 is turned over. In the double container 1, if the inner container 20 is in close contact with the outer container 10 at the shoulder portion 4 provided with the panel portion 40, even if a squeeze operation for pressing the outer container 10 is performed, the pressing force will be applied. The inner container 20 may not be easily deflated and the contents may not be properly poured out. In the double container 1 according to Embodiment 1, since the inner container 20 can be easily separated from the outer container 10 at the shoulder portion 4 provided with the panel portion 40, the inner container 20 can be easily peeled off according to the pressing force of the squeezing operation. can be smoothly contracted. Therefore, in the double container 1 according to Embodiment 1, the inner container 20 can be smoothly contracted with a simple configuration, and the contents can be properly poured out.

Furthermore, in the double container 1 according to Embodiment 1, outside air introduced from the outside air introduction hole 11 is present between the outer container 10 and the inner container 20 in the panel portion 40 as the panel portion 40 is turned over. is formed. Therefore, in the double container 1 according to the first embodiment, outside air introduced from the outside air introduction hole 11 smoothly flows between the inner container 20 and the outer container 10 in the shoulder portion 4 provided with the panel portion 40. can be made Thereby, in the double container 1 according to Embodiment 1, the inner container 20 can be more easily contracted according to the pressing force of the squeezing operation. Therefore, in the double container 1 according to Embodiment 1, the inner container 20 can be contracted more smoothly with a simple configuration, and the contents can be poured out more appropriately.

Furthermore, in the double container 1 according to Embodiment 1, at least one of the outer container 10 and the inner container 20 in the panel portion 40 is provided with the outer container 10 and the inner container 20 as the panel portion 40 is turned over. A wrinkle 43 forming a gap A3 is generated between . In the double container 1 according to Embodiment 1, the gap A3 formed by the wrinkles 43 of the panel portion 40 forms a flow path for the outside air introduced from the outside air introduction hole 11 . For this reason, in the double container 1 according to Embodiment 1, attention is paid to the wrinkles 43 that occur as the panel portion 40 is turned over, and the gap A3 formed by the wrinkles 43 is introduced from the outside air introduction hole 11. It can be utilized as a flow path for outside air. As a result, in the double container 1 according to Embodiment 1, between the inner container 20 and the outer container 10 at the shoulder portion 4 provided with the panel portion 40, without providing a complicated configuration or a special process. Outside air introduced from the outside air introduction hole 11 can be smoothly circulated. Therefore, in the double container 1 according to Embodiment 1, it is possible to easily achieve smooth contraction of the inner container 20 and appropriate pouring out of the contents.

Furthermore, in the double container 1 according to Embodiment 1, the outer container 10 and the inner container 20 are manufactured by blow molding, and the panel portion 40 is in a state in which the panel portion 40 bulges outward after blow molding. , a flow path for the outside air introduced from the outside air introduction hole 11 is formed. For this reason, in the double container 1 according to Embodiment 1, the flow path of the external air introduced from the external air introduction hole 11 can be achieved simply by adding the reversing process of reversing the panel part 40 after the existing molding process of blow molding. can be easily formed. Therefore, in the double container 1 according to Embodiment 1, it is possible to easily achieve smooth contraction of the inner container 20 and appropriate pouring out of the contents.

Furthermore, in the double container 1 according to Embodiment 1, the outside air introduction hole 11 is provided in the mouth portion 3 of the outer container 10 and the panel portion 40 is provided in the shoulder portion 4 . That is, in the double container 1 according to Embodiment 1, the panel portion 40 is provided on the shoulder portion 4 which is a portion connected to the mouth portion 3 provided with the outside air introduction hole 11 . As a result, in the double container 1 according to Embodiment 1, the gap A3 formed between the outer container 10 and the inner container 20 in the panel portion 40 is formed in the vicinity of the outside air introduction hole 11, so that the outside air introduction hole It becomes easy to secure the flow path of the outside air introduced from 11 in the vicinity of the outside air introduction hole 11 . As a result, in the double container 1 according to the first embodiment, the outside air introduced from the outside air introduction hole 11 can be smoothly circulated, and the inner container 20 can be contracted more smoothly according to the pressing force of the squeezing operation. can be done. Therefore, in the double container 1 according to Embodiment 1, the inner container 20 can be contracted more smoothly with a simple configuration, and the contents can be poured out more appropriately.

Further, in the method for manufacturing the double container 1 according to the first embodiment, the panel portion 40 which is different from the pressure-reducing absorption panel can be reversed between the outwardly bulging state and the inwardly bulging state, and the shoulder portion 4 A molding process for blow-molding the outer container 10 and the inner container 20 so as to be provided in . In addition, the method for manufacturing the double container 1 according to Embodiment 1 includes a reversing step of reversing the panel portion 40 so that the panel portion 40 bulges in a different direction from that after the molding step. That is, in the method for manufacturing the double container 1 according to Embodiment 1, the panel portion 40 is molded in the existing molding process of blow molding, and the panel portion 40 is simply added after the molding step by an inversion step of inverting the panel portion 40. A double container 1 with a portion 40 can be manufactured. Therefore, in the method for manufacturing the double container 1 according to the first embodiment, it is possible to easily manufacture the double container 1 in which the inner container 20 can be smoothly shrunk and the contents can be properly poured out with a simple structure. can.

Furthermore, in the method for manufacturing the double container 1 according to the first embodiment, the content molded by the molding process is performed by sucking gas from the mouth portion 3 of the inner container 20 or by blowing gas from the outside air introduction hole 11. A peeling step of shrinking the container 20 and peeling it from the outer container 10 is provided. In addition, in the method for manufacturing the double container 1 according to Embodiment 1, the content peeled by the peeling step is performed by blowing gas from the mouth portion 3 of the inner container 20 or sucking gas from the outside air introduction hole 11. A restoration process is provided to expand the container 20 and restore the shape along the outer container 10 . The inversion process is then performed as part of the restoration process. Therefore, in the method for manufacturing the double container 1 according to Embodiment 1, the panel section 40 can be turned over as part of the existing restoration process without providing a special process. For this reason, in the method for manufacturing the double container 1 according to the first embodiment, the double container 1 which can smoothly contract the inner container 20 and appropriately pour out the contents with a simple structure can be manufactured more easily. be able to.

[Other embodiments]
The double container 1 according to Embodiments 2 and 3 will be described. In the description of the double container 1 according to Embodiments 2 and 3, the description of the configuration and operation similar to those of the double container 1 according to Embodiment 1 will be redundant and will be omitted.

FIG. 7 is a longitudinal cross-sectional view of the shoulder portion 4 of the double container 1 according to Embodiment 2, and is a longitudinal cross-sectional view of the shoulder portion 4 after the panel portion 40 is turned over.

In the double container 1 according to Embodiment 1, both the outer container 10 and the inner container 20 in the panel section 40 are inverted as shown in FIGS. 4(a) and 4(b). Along with this, in the double container 1 according to the first embodiment, a flow path for outside air introduced from the outside air introduction hole 11 is formed between the outer container 10 and the inner container 20 in the panel portion 40 .

On the other hand, in the double container 1 according to Embodiment 2, only the outer container 10 in the panel portion 40 is inverted as shown in FIG. In the double container 1 according to the second embodiment, as only the outer container 10 in the panel portion 40 is turned over, the air from the outside air introduction hole 11 is introduced between the outer container 10 and the inner container 20 in the panel portion 40. A flow path for the introduced outside air may be formed.

The double container 1 according to Embodiment 2 is manufactured by the following method. That is, in the double container 1 according to the second embodiment, after the reversing step 603a in FIG. is added between the outer container 10 and the inner container 20. As a result, in the double container 1 according to the second embodiment, the inner container 20 bulging outward as shown in FIG. 4(b) due to the reversing step becomes inwardly bulging as shown in FIG. . As a result, in the double container 1 according to Embodiment 2, only the outer container 10 in the panel portion 40 is outside as shown in FIG. 7, compared to the state immediately after blow molding shown in FIG. It will be in an inverted state so as to bulge out.

For this reason, in the double container 1 according to the second embodiment, the gap A3 formed between the inner container 20 and the outer container 10 in the panel part 40 has a flow passage cross-sectional area larger than that in the first embodiment. and functions as a low-friction external air flow path. Therefore, in the double container 1 according to the second embodiment, the outside air introduced from the outside air introduction hole 11 can be more smoothly circulated, and the inner container 20 can be more smoothly contracted according to the pressing force of the squeezing operation. be able to. Therefore, in the double container 1 according to Embodiment 2, the inner container 20 can be contracted more smoothly with a simple configuration, and the contents can be poured out more appropriately.

Further, as described above, in the double container 1 according to Embodiment 1, as shown in FIG. be provided. That is, the panel portion 40 is provided on the shoulder portion 4 which is a portion connected to the mouth portion 3 provided with the outside air introduction hole 11 .

On the other hand, in the double container 1 according to Embodiment 3, the panel portion 40 may be provided at a portion other than the shoulder portion 4 . For example, in the double container 1 according to Embodiment 3, when the outside air introduction hole 11 is provided in the shoulder portion 4 or the bottom portion 6 , the panel portion 40 may be provided in the body portion 5 . When the outside air introduction hole 11 is provided in the shoulder portion 4 or the bottom portion 6 , the body portion 5 provided with the panel portion 40 is a portion connected to the shoulder portion 4 or the bottom portion 6 provided with the outside air introduction hole 11 . Further, for example, in the double container 1 according to Embodiment 3, when the outside air introduction hole 11 is provided in the body portion 5 , the panel portion 40 may also be provided in the body portion 5 .

In the double container 1 according to the third embodiment, even if the panel portion 40 is provided at a portion other than the shoulder portion 4, the flow path of the outside air introduced from the outside air introduction hole 11 is secured in the vicinity of the outside air introduction hole 11. becomes easier. As a result, in the double container 1 according to the third embodiment, as in the first embodiment, the outside air introduced from the outside air introduction hole 11 can be smoothly circulated, and the inner container 20 can be displaced according to the pressing force of the squeezing operation. can be smoothly contracted. Therefore, in the double container 1 according to Embodiment 3, it is possible to smoothly contract the inner container 20 with a simple configuration and appropriately pour out the contents.

In addition, in the double container 1, the panel part 40 is not only provided on the shoulder part 4 or the body part 5, but also by combining the techniques of Embodiments 1 and 3, the panel part 40 is provided on at least the shoulder part 4 and the body part 5. may be provided in one. That is, in the double container 1 , for example, even if the outside air introduction hole 11 is provided in the mouth portion 3 of the outer container 10 , the panel portion 40 may be provided in both the shoulder portion 4 and the body portion 5 .

In the above-described embodiment, the double container 1 is molded so that the panel portion 40 bulges inward in the molding process, and the panel portion 40 bulges outward in the reversing step. It was manufactured by being inverted so that However, the double container 1 is molded so that the panel portion 40 bulges outward in the molding process, and is turned upside down so that the panel portion 40 bulges inward in the reversing step. may be manufactured by

[others]
In the above-described embodiment, the double container 1 corresponds to an example of the "double 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 mouth 3 corresponds to an example of the "mouth" described in the claims. The shoulder portion 4 corresponds to an example of the "shoulder portion" described in the claims. The trunk portion 5 corresponds to an example of the "trunk portion" described in the claims. The outside air introduction hole 11 corresponds to an example of the "outside air introduction hole" described in the claims. The panel section 40 corresponds to an example of the "panel section" described in the claims. The gap A3 corresponds to an example of the "gap" described in the claims. The wrinkles 43 correspond to an example of "wrinkles" described in the claims. The molding process of step 601 corresponds to an example of the "molding process" described in the claims. The peeling process of step 602 corresponds to an example of the "peeling process" described in the claims. The restoration process of step 603 corresponds to an example of the "restoration process" described in the claims. The reversing process of step 603a corresponds to an example of the "reversing process" described in the claims.

The above-described embodiments can apply each other's techniques to each other including the modified examples. The above-described embodiments do not limit the content of the present invention, and modifications can be made without departing from the scope of the claims.

The terms used in the above-described embodiments and claims should be interpreted as non-limiting terms. For example, the term "including" should be interpreted as "not limited to what is stated to include." The term "comprising" should be interpreted as "not limited to what is described as comprising". The term "having" should be interpreted as "not limited to what is described as having".

1 Double Container 3 Mouth 4 Shoulder 5 Body 6 Bottom 10 Outer Container 11 Outside Air Introduction Hole 20 Inner Container 40 Panel 41 Panel Body 42 Edge 43 Wrinkles 44 Top 45 Flat 46 Periphery A1 Gap A2 Air Layer A3 Gap P1 Plane P2 Plane P3 Plane S Housing space Z Central axis

Claims (7)

An inner container that accommodates contents and can be shrunk as the contents decrease, and a bottle-shaped outer container that is provided with an outside air introduction hole for introducing outside air between the inner container and the inner container and encloses the inner container are separated. A double container that is capable of being stacked,
The outer container and the inner container are manufactured by blow molding,
At least one of the shoulder portion and the body portion is provided with a panel portion that can be reversed between an outwardly bulging state and an inwardly bulging state,
The outside air flows between the outer container and the inner container in the panel portion as the panel portion reverses from an inwardly bulging state after blow molding to an outwardly bulging state. forming a flow path for the outside air introduced from the introduction hole;
double container. At least one of the outer container and the inner container in the panel portion has wrinkles forming a gap between the outer container and the inner container as the panel portion is turned over. ,
In the panel section, the gap formed by the wrinkles forms the flow path for the outside air introduced from the outside air introduction hole,
Double container according to claim 1. The panel section forms the flow path for the outside air as only the outer container is turned over.
Double container according to claim 1 . The outside air introduction hole is provided at the mouth of the outer container,
The panel portion is provided on the shoulder portion,
A double container according to any one of claims 1-3 . An inner container that accommodates contents and can be shrunk as the contents decrease, and a bottle-shaped outer container that is provided with an outside air introduction hole for introducing outside air between the inner container and the inner container and encloses the inner container are separated. A method of manufacturing a stackable double container comprising:
Molding for blow-molding the outer container and the inner container so that a panel portion that can be reversed between an outwardly bulging state and an inwardly bulging state is provided on at least one of the shoulder portion and the body portion. process and
a reversing step of reversing the panel portion so that the panel portion bulges outward from the inwardly bulged state after the molding step;
A method for manufacturing a double container comprising: An inner container that accommodates contents and can be shrunk as the contents decrease, and a bottle-shaped outer container that is provided with an outside air introduction hole for introducing outside air between the inner container and the inner container and encloses the inner container are separated. A method of manufacturing a stackable double container comprising:
Molding for blow-molding the outer container and the inner container so that a panel portion that can be reversed between an outwardly bulging state and an inwardly bulging state is provided on at least one of the shoulder portion and the body portion. process and
A peeling step of shrinking the inner container molded in the molding step and peeling it from the outer container by sucking gas from the mouth of the inner container or blowing gas from the outside air introduction hole;
By blowing gas from the mouth of the inner container or sucking gas from the outside air introduction hole, the inner container peeled by the peeling step is expanded and restored to a shape along the outer container. process and
a reversing step of reversing the panel portion so that the panel portion bulges in a different direction from that after the molding step, the reversing step being performed as part of the restoring step ;
A method for manufacturing a double container comprising: In the reversing step, a flow path for the external air introduced from the external air introduction hole is formed between the outer container and the inner container in the panel unit as the panel unit is reversed.
A method for manufacturing a double container according to claim 6.

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