Double container

Abstract

To provide a double container capable of reducing the force required to pull out an inner bag and having excellent dischargeability of contents.SOLUTION: A double container includes a container body. A direction in which a central axis of a mouth of the container body extends is defined as an axial direction. The total height of the container body is defined as H, a part of a body where the perimeter in a cross section perpendicular to the axial direction is maximum is defined as the maximum perimeter, and the height of the maximum perimeter from a bottom surface of the container body is defined as Hmax. The body includes a shoulder portion configured such that the perimeter in a cross section perpendicular to the axial direction increases as going away from the mouth, and Hmax / H is 0.20 to 0.40. When the outer diameter in the long axis direction at the maximum perimeter where the outer diameter is maximum is defined as DLmax and the outer diameter in the short axis direction perpendicular to the long axis direction is defined as DSmax, DSmax / DLmax is 0.70 to 0.95.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a double container.

Background Art

[0002] Conventionally, a double container having a container body with an outer shell and an inner bag is known. For example, Patent Document 1 discloses a double container formed by performing biaxial stretch blow molding in a state where an outer shell preform and an inner bag preform are stacked.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when the outer shell and the inner bag of such a double container are formed of different materials, or when the contents adhere to the inner bag after use, etc., when recycling the double container, it is desirable to separate the outer shell and the inner bag.

[0005] The outer shell and the inner bag can be separated by the user pulling out the inner bag from the outer shell, and it is desirable to reduce the force required for pulling out the inner bag. Also, it is desirable that the dischargeability of the contents from the double container is excellent.

[0006] The present invention has been made in view of such circumstances, and provides a double container in which the force required for pulling out the inner bag can be reduced and the dischargeability of the contents is excellent.

Means for Solving the Problems

[0007] According to the present invention, the following inventions are provided. [1] A double container comprising a container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag, the inner bag is configured to be pullable out of the container body, the container body includes a mouth portion, a body portion, and a bottom portion, the mouth portion is a cylindrical portion having an open end, the body portion is disposed adjacent to the mouth portion on a side farther from the open end than the mouth portion, the bottom portion is configured to close the lower end of the body portion, the direction in which the central axis of the mouth portion of the container body extends is defined as the axial direction, the overall height of the container body is denoted as H, the portion of the body portion where the perimeter in a cross-section perpendicular to the axial direction is maximum is defined as the maximum perimeter portion, and the height of the maximum perimeter portion from the bottom surface of the container body is denoted as Hmax, then the body portion includes a shoulder portion configured such that the perimeter in a cross-section perpendicular to the axial direction increases as it moves away from the mouth portion, Hmax / H is 0.20 to 0.40, the major-axis direction outer diameter that is maximum at the maximum perimeter portion is denoted as DLmax, and the minor-axis direction outer diameter perpendicular to the major-axis direction is denoted as DSmax, then DSmax / DLmax is 0.70 to 0.95. A double container. [2] The double container according to [1], wherein the portion of the body portion where the perimeter in a cross-section perpendicular to the axial direction is minimum is defined as the minimum perimeter portion, the height of the minimum perimeter portion from the bottom surface of the container body is denoted as Hmin, and the major-axis direction outer diameter at the minimum perimeter portion is denoted as DLmin, then (DLmax - DLmin) / (Hmin - Hmax) is 0.26 to 0.46. A double container. [3] The double container according to [2], wherein Hmin / H is 0.80 to 0.90. A double container. [4] The double container according to any one of [1] to [3], wherein the body portion includes an inner convex curved portion that is convex inward and an outer convex curved portion that is convex outward, the outer convex curved portion is disposed on a side closer to the bottom surface than the inner convex curved portion, the maximum perimeter portion is disposed at the outer convex curved portion, the height of the boundary portion between the inner convex curved portion and the outer convex curved portion from the bottom surface is denoted as Hb, and the major-axis direction outer diameter at the boundary portion is denoted as DLb, then (DLmax - DLb) / (Hb - Hmax) is 0.28 to 0.48. A double container. [5] The double container according to [4], wherein Hb / H is 0.45 to 0.75. A double container.

Advantages of the Invention

[0008] In the double container of the present invention, since the maximum circumference portion where the circumference is the largest is provided at a lower position of the container body, the diameter of the body portion of the container body can be gently expanded from the mouth portion of the container body toward the maximum circumference portion. When the diameter of the body portion of the container body rapidly expands, the friction between the inner bag and the outer shell increases when pulling out the inner bag, and the force required to pull out the inner bag tends to increase. However, by gently expanding the diameter of the body portion of the container body toward the maximum circumference portion, the force required to pull out the inner bag can be reduced. Further, since the container body of the double container of the present invention has a flat shape at the maximum circumference portion, it is easy to crush the container body and discharge the contents. Therefore, according to the present invention, a double container in which the force required to pull out the inner bag can be reduced and the dischargeability of the contents is excellent can be obtained.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described. Various characteristic matters shown in the following embodiments can be combined with each other. An invention can be established independently for each characteristic. Among the following embodiments, elements not defined in the claims are arbitrary elements and can be omitted. At the end of the numerical values disclosed in the following description, an arbitrary number (for example, one or two) of "0" may be added. For example, one or two "0" may be added after "1.4" to make it "1.40" or "1.400".

[0011] With reference to FIGS. 1 to 11, a double container 1 according to an embodiment of the present invention will be described. Terms related to directions such as "up" and "down" in the following description mean directions in a state where the bottom 7 is grounded. Also, in the following description, the "axial direction" is the direction in which the central axis C (shown in FIG. 2) of the mouth portion 5 extends, for example, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" is the rotational direction around the central axis C of the mouth portion 5, for example, the direction in which the inner bag 4 is rotated with respect to the outer shell 3 at the mouth portion 5. "Clockwise" and "counterclockwise" are directions as viewed from the upper side of the double container 1 unless otherwise specified.

[0012] 1-1. Configuration of the double container 1 As shown in FIG. 1, the double container 1 according to an embodiment of the present invention includes a container body 2 and a mouth mounting member 8. The container body 2 houses the contents. Hereinafter, each configuration will be described in detail.

[0013] The content is, in one example, a high-viscosity substance having a viscosity at 20°C of 100 mPa·s or more. Examples of high-viscosity substances include ketchup, mayonnaise, and honey. The viscosity of the high-viscosity substance at 20°C is preferably 500 mPa·s or more, more preferably 1000 mPa·s or more, and even more preferably 5000 mPa·s or more. The upper limit of the viscosity of the high-viscosity substance at 20°C is not particularly defined, but is, for example, 10000, 50000, or 100000 mPa·s.

[0014] <Basic configuration of container body 2> As shown in FIGS. 2 to 6, the container body 2 includes a mouth portion 5, a body portion 6, and a bottom portion 7. The mouth portion 5 is a cylindrical (preferably circular cylindrical) portion having an open end 5c. The open end 5c is the open end of the container body 2 and also the open end of the inner bag 4.

[0015] The body portion 6 is disposed adjacent to the mouth portion 5 on the side farther from the open end 5c than the mouth portion 5. The body portion 6 is cylindrical, and the bottom portion 7 is provided at the lower end of the body portion 6 and closes the lower end of the body portion 6. The body portion 6 includes a shoulder portion 6b whose circumferential length in a cross-section perpendicular to the axial direction increases as it moves away from the mouth portion 5. The "circumferential length" means the length of the outer circumference in a cross-section perpendicular to the axial direction as shown in FIGS. 5A to 5C. A decrease and an increase in the circumferential length are also referred to as "diameter reduction" and "diameter expansion", respectively. Further, the body portion 6 includes a body main portion 6c on the side of the bottom portion 7 rather than the shoulder portion 6b. The body main portion 6c has, for example, a shape in which the outer diameter is substantially constant toward the bottom portion 7 or a shape in which the diameter decreases toward the bottom portion 7. In the following description, among the portions below the lower surface 3f3 of the second flange portion 3f2 shown in FIGS. 3 and 8, the portion other than the bottom portion 7 is referred to as the body portion 6.

[0016] As shown in FIGS. 5 to 9, the container body 2 includes an inner bag 4 and an outer shell 3 disposed so as to cover the inner bag 4. The inner bag 4 has an inner bag main body 4d other than the protruding portion 4c accommodated in the outer shell 3. In the following description, among the inner bag 4, the portions corresponding to the mouth portion 5, the body portion 6, and the bottom portion 7 of the container body 2 are referred to as the mouth portion 5, the body portion 6, and the bottom portion 7 of the inner bag 4, respectively. The same applies to the outer shell 3.

[0017] As shown in FIGS. 3 to 5, when the overall height of the container body 2 is H, the portion of the body portion 6 where the perimeter in the cross-section perpendicular to the axial direction is maximum is defined as the maximum perimeter portion 2a, and the height of the maximum perimeter portion 2a from the bottom surface 7a of the container body 2 is Hmax, then Hmax / H is 0.20 to 0.40 (0.30 in this embodiment). Thus, in this embodiment, since the maximum perimeter portion 2a is provided at a low position of the container body 2, the body portion 6 of the container body 2 can be gently expanded in diameter from the mouth portion 5 of the container body 2 toward the maximum perimeter portion 2a. When the body portion 6 of the container body 2 rapidly expands in diameter, the friction between the inner bag 4 and the outer shell 3 becomes large when pulling out the inner bag 4, and the force required to pull out the inner bag 4 tends to increase. However, in this embodiment, by gently expanding the diameter of the body portion 6 of the container body 2 toward the maximum perimeter portion 2a, the force required to pull out the inner bag 4 can be reduced.

[0018] Hmax / H is preferably 0.25 to 0.35. Specifically, for example, it can be 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, and it can also be in the range between any two of the values exemplified here. H is, for example, 150 to 180 mm (164 mm in this embodiment), preferably 160 to 170 mm. Specifically, for example, it can be 150, 155, 160, 165, 170, 175, 180 mm, and it can also be in the range between any two of the values exemplified here. Hmax is, for example, 40 to 60 mm (49 mm in this embodiment), preferably 45 to 55 mm. Specifically, for example, it can be 40, 45, 50, 55, 60 mm, and it can also be in the range between any two of the values exemplified here.

[0019] As shown in FIG. 5C, the outer diameter in the major axis direction (the left-right direction in FIG. 3) where the outer diameter is the largest at the maximum circumferential length portion 2a (that is, the "distance between the outer surfaces") is defined as DLmax, and the outer diameter in the minor axis direction perpendicular to the major axis direction (the left-right direction in FIG. 4A) is defined as DSmax. Then, DSmax / DLmax is 0.70 to 0.95 (0.83 in this embodiment). Thus, in this embodiment, since the container body 2 has a flat shape at the maximum circumferential length portion 2a, it is easy to crush the container body 2 to discharge the contents. DSmax / DLmax is preferably 0.75 to 0.90. Specifically, for example, it can be 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, or it can be in the range between any two of the values exemplified here. DLmax is, for example, 50 to 75 mm (62 mm in this embodiment), preferably 55 to 70 mm. Specifically, for example, it can be 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 mm, or it can be in the range between any two of the values exemplified here. DSmax is, for example, 40 to 60 mm (51 mm in this embodiment), preferably 45 to 55 mm. Specifically, for example, it can be 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 mm, or it can be in the range between any two of the values exemplified here.

[0020] Let the wall thickness at the part 2a1, which is the farthest from the central axis C in the maximum circumference part 2a, be TL, and the wall thickness at the part 2a2, which is the closest to the central axis C, be TS. TL / TS is, for example, 0.70 to 0.95 (in this embodiment, 0.83). When discharging the contents from the double container 1, usually, the container body 2 is deformed so as to crush the container body 2 in the short side direction. When TL / TS is within the above numerical range, the wall thickness of the part 2a2 pressed when crushing the container body 2 is relatively large, and the wall thickness of the part 2a1 bent when crushing the container body 2 is relatively small. Therefore, it is easy to crush the container body 2 and easy to discharge the contents. The preferable numerical range for TL / TS is the same as that described above for DSmax / DLmax. Since the wall thickness of the container body 2 is inversely proportional to the degree of stretching (blow ratio) during blow molding, when the container body 2 is formed using a preform 15 (shown in FIG. 11) having a circular cross section and a constant wall thickness in the circumferential direction, the farther the part is from the central axis C, the smaller the wall thickness of the container body 2 becomes. For this reason, TL / TS is preferably in a proportional relationship with DSmax / DLmax.

[0021] The part of the body 6 where the circumference in the cross section perpendicular to the axial direction is the minimum is defined as the minimum circumference part 2b. In this embodiment, the body 6 is gradually reduced in diameter from the lower surface 2f3 of the second flange part 2f2 toward the minimum circumference part 2b, then gradually increased in diameter toward the maximum circumference part 2a and reaches the maximum circumference at the maximum circumference part 2a, and then gradually reduced in diameter toward the bottom surface 7a.

[0022] Let the height of the minimum circumference part 2b from the bottom surface 7a of the container body 2 be Hmin, and the outer diameter in the major axis direction at the minimum circumference part 2b be DLmin. Then, (DLmax - DLmin) / (Hmin - Hmax) (hereinafter referred to as the "first diameter expansion index") is preferably 0.26 to 0.46 (0.36 in this embodiment). The first diameter expansion index is calculated by dividing the difference in the outer diameters between the maximum circumference part 2a and the minimum circumference part 2b by the distance in the height direction, and is an index indicating the degree of diameter expansion in the body part 6. The smaller the first diameter expansion index, the more gently the container body 2 expands in diameter from the minimum circumference part 2b toward the maximum circumference part 2a, which means that the inner bag 4 is easier to pull out. Since the maximum circumference part 2a is provided at a lower position of the container body 2, the value of (Hmin - Hmax) becomes relatively large, so the first diameter expansion index has a relatively small value. The first diameter expansion index is preferably 0.30 to 0.42. Specifically, for example, it can be 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, and it can also be in the range between any two of the values exemplified here.

[0023] Hmin / H is preferably 0.80 to 0.90 (0.85 in this embodiment). Since the minimum circumference part 2b is provided at a high position of the container body 2, it is easy to increase the internal volume of the container body 2 and also easy to reduce the value of the first diameter expansion index. Specifically, for example, Hmin / H can be 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, and it can also be in the range between any two of the values exemplified here. DLmin / DLmax is, for example, 0.38 to 0.58 (0.48 in this embodiment), preferably 0.43 to 0.53. Specifically, for example, it can be 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, and it can also be in the range between any two of the values exemplified here.

[0024] When the outer diameter in the minor axis direction at the minimum perimeter portion 2b is defined as DSmin, DSmin / DLmin is, for example, 0.90 to 1.00 (1.00 in this embodiment). Thus, at the minimum perimeter portion 2b, the container body 2 is substantially circular. The container body 2 has a shape that gradually becomes flatter from the minimum perimeter portion 2b toward the maximum perimeter portion 2a. DSmin / DLmin is preferably 0.95 to 1.00, and specifically, for example, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.00, and may be in the range between any two of the numerical values exemplified herein.

[0025] The body portion 6 preferably includes an inwardly convex curved portion 6d that is convex on the inner side and an outwardly convex curved portion 6e that is convex on the outer side. The outwardly convex curved portion 6e is disposed closer to the bottom surface 7a than the inwardly convex curved portion 6d. The maximum perimeter portion 2a is disposed on the outwardly convex curved portion 6e. If the height from the bottom surface 7a of the boundary portion 6f between the inwardly convex curved portion 6d and the outwardly convex curved portion 6e is Hb and the outer diameter in the major axis direction at the boundary portion 6f is DLb, then (DLmax - DLb) / (Hb - Hmax) (hereinafter referred to as the "second diameter expansion index") is preferably 0.28 to 0.48 (0.38 in this embodiment). The second diameter expansion index is calculated by dividing the difference in the outer diameters between the maximum perimeter portion 2a and the boundary portion 6f by the distance in the height direction, and is an index indicating the degree of diameter expansion between the maximum perimeter portion 2a and the boundary portion 6f. The smaller the second diameter expansion index, the more gently the container body 2 expands in diameter from the boundary portion 6f toward the maximum perimeter portion 2a, which means that the inner bag 4 is easier to pull out. In the outwardly convex curved portion 6e, when pulling out the inner bag 4, the friction between the inner bag 4 and the outer shell 3 tends to increase and the force required to pull out the inner bag 4 tends to increase. In this embodiment, the force required to pull out the inner bag 4 can be reduced by gently expanding the diameter of the body portion 6 of the container body 2 from the boundary portion 6f toward the maximum perimeter portion 2a. The second diameter expansion index is preferably 0.33 to 0.43. Specifically, for example, it can be 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, or it can be within the range between any two of the numerical values exemplified herein.

[0026] Hb / H is preferably 0.45 to 0.75 (0.60 in this embodiment). The boundary portion 6f is preferably provided near the center of the minimum perimeter portion 2b and the maximum perimeter portion 2a. In this case, the force required to extract the inner bag 4 is particularly likely to be reduced. Hb / H is preferably 0.50 to 0.70. Specifically, for example, it can be 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, and it may be in the range between any two of the values exemplified here. DLb / DLmax is, for example, 0.60 to 0.80 (0.70 in this embodiment), and preferably 0.65 to 0.75. Specifically, for example, it can be 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, and it may be in the range between any two of the values exemplified here.

[0027] When the outer diameter in the minor axis direction at the boundary portion 6f is DSb, DSb / DLb is, for example, 0.76 to 0.96 (0.86 in this embodiment). Thus, at the boundary portion 6f, the container body 2 is slightly flattened. The container body 2 has a shape that gradually becomes flatter from the boundary portion 6f toward the maximum perimeter portion 2a. DSb / DLb is preferably 0.81 to 0.91. Specifically, for example, it can be 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, and it may be in the range between any two of the values exemplified here.

[0028] <Engagement structure between the container body 2 and the mouth attachment member 8> The mouth-attaching member 8 is a member that is attached to the mouth portion 5 of the container body 2. In this embodiment, the mouth-attaching member 8 is a cap 8a, but it may be another member such as a pump. In this embodiment, the mouth-attaching member 8 is configured to be attached to the mouth portion 5 in a plugging manner, but it may be configured to be attached to the mouth portion 5 in a screwing manner. As shown in FIG. 9, the container body 2 includes an axial engagement portion 4ma that axially engages with the mouth-attaching member 8 and a circumferential engagement portion 4mb that circumferentially engages with the mouth-attaching member 8. In this embodiment, the circumferential engagement portion 4mb is disposed at a position farther from the opening end 5c of the mouth portion 5 than the axial engagement portion 4ma, but it may be disposed at a position closer to the opening end 5c of the mouth portion 5 than the axial engagement portion 4ma. It is preferable that the container body 2 and the mouth-attaching member 8 do not engage with each other at portions other than the axial engagement portion 4ma and the circumferential engagement portion 4mb.

[0029] The mouth-attaching member 8 includes an engagement portion 8b. The engagement portion 8b is preferably provided on the inner peripheral surface of the outer cylinder 41a of the mouth-attaching member 8. The engagement portion 8b is preferably an annular convex portion 8b3. The engagement portion 8b axially engages with the axial engagement portion 4ma and circumferentially engages with the circumferential engagement portion 4mb. The circumferential engagement between the circumferential engagement portion 4mb and the engagement portion 8b may be an uneven engagement or a frictional engagement. Since the engagement portion 8b is a portion provided in substantially all plugging-type mouth-attaching members 8, according to the configuration of the present invention, it is possible to realize a rotation restricting structure between the mouth-attaching member 8 and the container body 2 using a plugging-type mouth-attaching member 8 having substantially any configuration, and the degree of freedom in selecting the mouth-attaching member 8 becomes very high. Plugging-type mouth-attaching members having dimensions and shapes conforming to the F-mouth standard are widely circulated and have excellent availability.

[0030] As shown in FIG. 9, the axial engagement portion 4ma preferably includes an annular convex portion 4c5, and the circumferential engagement portion 4mb preferably includes a plurality of engagement convex portions 4c2 that are spaced apart along the circumferential direction. The annular convex portion 4c5 is provided with a tapered surface 4c8 on its upper surface. This makes it easier for the engagement portion 8b to overcome the annular convex portion 4c5 when attaching the mouth-attaching member 8.

[0031] When the engaging portion 8b gets over the axial engaging portion 4ma and is engaged with the axial engaging portion 4ma, the state shown in FIG. 6B is obtained. In this state, the tip 8b4 of the engaging portion 8b is pressed against the circumferential engaging portion 4mb, and the engaging portion 8b and the circumferential engaging portion 4mb are in frictional engagement. Further, for example, when the circumferential engaging portion 4mb is composed of a plurality of engaging convex portions 4c2, each engaging convex portion 4c2 has a tapered shape, and the engaging portion 8b is more deformable than the engaging convex portion 4c2, when the engaging portion 8b is pressed against the engaging convex portion 4c2, the engaging convex portion 4c2 sinks into the engaging portion 8b, and the engaging portion 8b and the engaging convex portion 4c2 are in concavo-convex engagement in the circumferential direction. In one example, when the engaging portion 8b is made of a polyethylene-based resin and the engaging convex portion 4c2 is made of a polypropylene-based resin, since the polypropylene-based resin is usually higher in rigidity than the polyethylene-based resin, the engaging convex portion 4c2 is likely to sink into the engaging portion 8b.

[0032] <Detailed structure of the outer shell 3 and the inner bag 4> As shown in FIG. 7, the inner bag 4 includes a protruding portion 4c protruding from the opening end 3a of the outer shell 3. As shown in FIGS. 8 to 9, the inner bag 4 includes a first cylinder 4a and a second cylinder 4b. The first cylinder 4a is disposed inside the outer shell 3. The second cylinder 4b has an outer diameter larger than that of the first cylinder 4a and is disposed at a position closer to the opening end 5c of the inner bag 4 than the first cylinder 4a. The second cylinder 4b may be entirely disposed outside the outer shell 3, or a part or all of the second cylinder 4b may be disposed inside the outer shell 3 and the remainder may be disposed outside the outer shell 3.

[0033] As shown in FIG. 8, the second cylinder 4b includes a peripheral wall 4b1 and a bottom wall 4b2 provided below the peripheral wall 4b1 and configured to reduce the diameter of the peripheral wall 4b1 toward the first cylinder 4a. The inner bag 4 is arranged such that the bottom wall 4b2 abuts against the outer shell 3. When the bottom wall 4b2 abuts against the outer shell 3, the inner bag 4 is prevented from entering the outer shell 3. The peripheral wall 4b1 preferably extends parallel to the axial direction. Further, the angle α between the peripheral wall 4b1 and the bottom wall 4b2 is preferably 90 degrees or more (90 degrees in this embodiment). In this case, the bending of the inner bag 4 at the corner 4b3 between the bottom wall 4b2 and the peripheral wall 4b1 becomes relatively gentle, and it is less likely to crack when an impact is applied, so the impact resistance is improved. The length L1 between the lower surface 4b4 of the bottom wall 4b2 and the lower surface 4m3 of the axial engagement portion 4ma is preferably 2 mm or more. In this case, local bending of the inner bag 4 is further suppressed. The length L1 is, for example, 2 to 10 mm, preferably 3 to 6 mm (4.5 mm in this embodiment). Specifically, the length L1 is, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0 mm, and may be in the range between any two of the values exemplified here. The peripheral wall 4b1 preferably has a portion parallel to the axial direction. The portion parallel to the axial direction preferably has a length from the lower surface 4b4 within the above numerical range. Further, the peripheral wall 4b1 is preferably parallel to the axial direction throughout the whole between the lower surface 4b4 and the lower surface 4m3.

[0034] At the open end 3a of the outer shell 3, a base surface 3a1, an annular convex portion 3a2, and an inner bag support surface 3a3 are provided. The base surface 3a1 is preferably annular. The annular convex portion 3a2 is disposed inside the base surface 3a1 and protrudes axially from the base surface 3a1. Preferably, as shown in FIGS. 6 to 7, the base surface 3a1 faces the open end 41a1 of the outer cylinder 41a of the mouth attachment member 8, and the annular convex portion 3a2 protrudes toward the inside of the outer cylinder 41a of the mouth attachment member 8. According to such a configuration, even if the content inside the inner bag 4 enters the gap 44 between the base surface 3a1 and the open end 41a1, the entry of the content between the inner bag 4 and the outer shell 3 is suppressed by the annular convex portion 3a2. Also, it is preferable that the apex 3a4 of the annular convex portion 3a2 is at a position higher than the open end 41a1. In this case, the entry of the content is further suppressed.

[0035] The inner bag support surface 3a3 is a surface with which the lower wall 4b2 abuts. The inner bag support surface 3a3 is preferably annular. By the lower wall 4b2 abutting against the inner bag support surface 3a3, the inner bag 4 is supported by the outer shell 3 and the entry of the inner bag 4 into the outer shell 3 is suppressed. The inner bag support surface 3a3 is disposed inside the base surface 3a1 and the annular convex portion 3a2. The inner bag support surface 3a3 is preferably provided at a position lower than the base surface 3a1. In this case, a part of the peripheral wall 4b1 on the side close to the lower wall 4b2 is covered by the outer shell 3, and inevitably, the lower wall 4b2 and the corner portion 4b3 are also covered by the outer shell 3. Thereby, the corner portion 4b3 having relatively low impact resistance is protected by the outer shell 3, and the impact resistance of the inner bag 4 is further improved.

[0036] As shown in FIGS. 7 and 9, the inner bag 4 includes an axially engaging portion 4ma and a circumferentially engaging portion 4mb at a protruding portion 4c protruding from the open end 3a of the outer shell 3. As shown in FIGS. 8 and 9, the axially engaging portion 4ma and the circumferentially engaging portion 4mb are provided so as to protrude radially outward from the peripheral wall 4b1. As shown in FIG. 8, a recess 4c13 is provided on the inner peripheral surface of the axially engaging portion 4ma. The mouth attachment member 8 is preferably not engaged with the outer shell 3.

[0037] As shown in FIG. 8, the length L2 in the axial direction between the open end 5c of the inner bag 4 and the lower surface 4m3 of the axial engagement portion 4ma is preferably 4.0 to 5.0 mm. In the F-mouth standard, the length L2 is defined as 4.5 mm. By setting the length L2 within the above range, the mouth attachment member 8 compliant with the F-mouth standard can be used. Various mouth attachment members 8 compliant with the F-mouth standard are commercially available and have excellent availability. Specifically, the length L2 is, for example, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0 mm, and it may also be within the range between any two of the values exemplified herein.

[0038] The inner bag 4 is provided with an inclined portion 4e and a seal cylinder portion 4f in this order on the side of the open end 5c rather than the lower surface 4m3. As shown in FIGS. 6 to 7, the inner surface of the seal cylinder portion 4f is in close contact with the outer peripheral surface 41b1 of the inner cylinder 41b provided on the mouth attachment member 8. Thereby, leakage of the contents within the inner bag 4 is suppressed. The inclined portion 4e is configured to reduce the diameter of the axial engagement portion 4ma toward the seal cylinder portion 4f. As shown in FIG. 8, the length L3 in the axial direction between the lower end of the seal cylinder portion 4f and the lower surface 4m3 of the axial engagement portion 4ma is preferably 1.2 to 4.0 mm. By setting the length L3 within this range, it becomes easier to set the length L2 within the above range. Specifically, the length L3 is, for example, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0 mm, and it may also be within the range between any two of the values exemplified herein.

[0039] An enlarged diameter portion 4o is provided at the open end 5c of the inner bag 4, thereby facilitating the insertion of the inner cylinder 41b into the inner bag 4.

[0040] In the axial direction, the length L4 between the open end 5c and the lower end of the seal cylinder portion 4f, and the length L5 of the seal cylinder portion 4f are preferably 0.5 to 3.3 mm, respectively. By setting the lengths L4 and L5 within this range, it becomes easier to set the lengths L2 and L3 within the above range. Specifically, the lengths L4 and L5 are, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.3 mm, respectively, and may be within the range between any two of the values exemplified herein.

[0041] For the axial engagement portion 4ma, the protruding length L6 from the peripheral wall 4b1 is preferably 0.60 to 1.85 mm. In this case, there is an advantage that it becomes easier to set L2 to L4 within the above range. Specifically, the protruding length L6 is, for example, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75, 1.80, 1.85 mm, respectively, and may be within the range between any two of the values exemplified herein.

[0042] From the viewpoint of meeting the F-port standard, it is preferable to meet at least one of the following dimensions. · The outer diameter of the axial engagement portion 4ma is 30.5 to 33.8 mm (preferably 31.8 to 33.3 mm, more preferably 32.3 to 33.3 mm. In this embodiment, it is 32.8 mm) · The outer diameter at the open end 5c of the inner bag 4 is 29.0 to 31.0 mm (preferably 29.5 to 30.5 mm. In this embodiment, it is 30.0 mm) · The diameter of the outer peripheral surface of the seal cylinder portion 4f is 28.1 to 30.1 mm (preferably 28.6 to 29.6 mm. In this embodiment, it is 29.1 mm)

[0043] As shown in Fig. 9, a rib 4g is provided on the outer peripheral surface of the inner bag 4 (more specifically, the inner bag body 4d). The lower surface of the rib 4g is inclined so as to approach the opening end 5c as it proceeds in the counterclockwise direction.

[0044] A plurality of ribs 4g are provided on the outer peripheral surface of the inner bag 4, and the starting points and ending points of the plurality of ribs 4g are shifted from each other in the circumferential direction. In the present embodiment, two ribs 4g are arranged with a 180-degree shift in the circumferential direction. Further, the angle at which each rib 4g extends is preferably 180 degrees or less, and more preferably 90 degrees or less. This angle is, for example, 15 to 180 degrees, and preferably 30 to 90 degrees (about 45 degrees in the present embodiment). Specifically, this angle is, for example, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180 degrees, and may be in the range between any two of the values exemplified herein.

[0045] A cam rail 3l is provided on the inner peripheral surface of the outer shell 3. A concave groove 3m engageable with the rib 4g is provided in a part of the cam rail 3l. The concave groove 3m is preferably provided at the end of the cam rail 3l. The upper surface of the cam rail 3l is inclined so as to approach the opening end 3a as it proceeds in the counterclockwise direction. The rib 4g and the concave groove 3m are configured to be engageable by rotating the inner bag 4 clockwise with respect to the outer shell 3, and to be disengaged by rotating the inner bag 4 counterclockwise with respect to the outer shell 3. The concave groove 3m is formed as a non-through hole. In this case, compared with the case where the concave groove 3m is formed as a through hole, the outer shell 3 is less likely to crack.

[0046] On the inner peripheral surface of the outer shell 3, a plurality of cam rails 3l are provided, and the starting points and ending points of the plurality of cam rails 3l are offset from each other in the circumferential direction. In the present embodiment, two cam rails 3l are arranged with a 180-degree offset in the circumferential direction. Further, the angle through which each cam rail 3l extends is preferably 360 degrees or less, and more preferably 270 degrees or less. This angle is, for example, 90 to 360 degrees, and preferably 120 to 240 degrees (180 degrees in the present embodiment). Specifically, this angle is, for example, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360 degrees, and may be in the range between any two of the numerical values exemplified herein.

[0047] The concave strip 3m is preferably provided on each cam rail 3l. The explanation of the angle through which the concave strip 3m extends is the same as the explanation of the angle for the convex strip 4g described above.

[0048] It is preferable that the container body 2 is provided with a rotation restricting structure for restricting the relative rotation of the inner bag 4 and the outer shell 3. Examples of this rotation restricting structure include a structure for increasing the frictional force between the inner bag 4 and the outer shell 3 and a structure for engaging the inner bag 4 and the outer shell 3 in a concave-convex manner in the circumferential direction.

[0049] Before the inner bag 4 is pulled out from the container body 2, the lower surface of the convex strip 4g abuts on the upper surface of the cam rail 3l within the concave strip 3m. The cam mechanism 31 is constituted by the convex strip 4g and the cam rail 3l. When the inner bag 4 is rotated counterclockwise with respect to the outer shell 3, the inner bag 4 is displaced in a direction to come out of the container body 2 by the action of the cam mechanism 31. At this time, the inner bag 4 is twisted and its diameter is reduced. The cam mechanism 31 has an inclined structure in the same direction as a right-handed screw.

[0050] As shown in FIGS. 8 to 9, first and second flange portions 3f1 and 3f2 are provided on the outer peripheral surface of the outer shell 3 in order from the opening end 3a side of the outer shell 3. The cam mechanism 31 is preferably arranged such that the lower end of the cam mechanism 31 is closer to the opening end 3a than the lower surface 3f3 (preferably the central surface 3f4, more preferably the upper surface 3f5) of the second flange portion 3f2. The container body 2 is formed by biaxially stretch blow molding the preform 15 shown in FIGS. 10 to 11, and the second flange portion 13f2 and the cam mechanism 15g of the preform 15 become the second flange portion 3f2 and the cam mechanism 31 of the container body 2 after molding. The cam mechanism 15g is composed of a rib 14g of the inner preform 14 and a cam rail 13l of the outer preform 13. Since the bottom 15c side of the preform 15 is heated and mainly stretched rather than the lower surface 13f3 of the second flange portion 13f2, by arranging the cam mechanism 15g at a position closer to the opening end 13d of the outer preform 13 than the lower surface 13f3 of the second flange portion 13f2, it is possible to suppress the shape of the cam mechanism 15g provided on the preform 15 from collapsing during molding. Similarly, the concave groove 3m and the convex rib 4g, and the portions corresponding to the concave groove 3m and the convex rib 4g in the preform 15 are preferably arranged at positions closer to the opening ends 3a and 13d than the lower surfaces 3f3 and 13f3 of the second flange portions 3f2 and 13f2.

[0051] As shown in FIG. 8, the first flange portion 3f1 is configured such that the opening end 3a has an enlarged diameter. Preferably, a recess 3g is provided on the inner peripheral surface of the first flange portion 3f1. The lower surface of the recess 3g serves as the inner bag support surface 3a3. In the F-mouth standard, it is defined that the axial length from the opening end 5c of the container body 2 to the lower surface of the support ring that supports the mouth portion 5 when the mouth portion mounting member 8 is mounted is 10.2 mm. Therefore, if an attempt is made to comply with the F-mouth cap standard with a single flange portion provided on the outer shell 3, it is necessary to provide the flange portion at the opening end 3a or a position adjacent thereto like the first flange portion 3f1. In that case, heat is likely to be applied to the cam mechanism 15g provided on the preform 15 during molding, and the shape of the cam mechanism 15g is likely to collapse during molding. On the other hand, in the present embodiment, since the first and second flange portions 3f1 and 3f2 are provided, the shape of the cam mechanism 15g provided on the preform 15 is suppressed from collapsing during molding. The first flange portion 3f1 is provided as a support ring, and preferably, the first flange portion 3f1 does not engage with the mouth portion mounting member 8.

[0052] The length L7 between the lower surfaces of the first and second flange portions 3f1 and 3f2 in the axial direction is, for example, 3 to 9 mm, and preferably 4.5 to 7.5 mm (in this embodiment, it is 6 mm). Specifically, the length L7 is, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0 mm, and it may be within the range between any two of the values exemplified here.

[0053] <Detailed Configuration of the Mouth Port Mounting Member 8> As shown in FIG. 7, the mouth portion mounting member 8 preferably has a discharge port 8d for discharging the contents in the inner bag 4. Further, the mouth portion mounting member 8 preferably includes a nozzle 8c.

[0054] The mouth-attached member 8 preferably includes a main body member 41 and an opening / closing member 42. When the mouth-attached member 8 is the cap 8a, the main body member 41 is the cap body, and the opening / closing member 42 is the overcap. The main body member 41 is configured to be engageable with the protruding portion 4c and includes a discharge port 8d. The opening / closing member 42 is configured to open and close the discharge port 8d. FIG. 6 shows the closed state where the discharge port 8d is closed, and FIG. 7 shows the open state where the discharge port 8d is open. In the present embodiment, the main body member 41 and the opening / closing member 42 are connected by a hinge 43, but they may not be connected. The opening / closing member 42 is preferably engageable with the main body member 41 by a screw or a snap fit.

[0055] The main body member 41 includes an outer cylinder 41a, an inner cylinder 41b, a nozzle 8c, and an upper wall 41d. The inner cylinder 41b is disposed inside the outer cylinder 41a. The outer cylinder 41a and the inner cylinder 41b are connected via the upper wall 41d. The nozzle 8c is disposed above the upper wall 41d. A circulation hole 41i is provided in the upper wall 41d, and the circulation paths of the inner cylinder 41b and the nozzle 8c are connected through the circulation hole 41i. The tip of the nozzle 8c becomes the discharge port 8d. The inner cylinder 41b is inserted into the protruding portion 4c and is in close contact with the inner surface 4f1 of the seal cylinder portion 4f. Therefore, the inner cylinder 41b and the seal cylinder portion 4f are frictionally engaged in the circumferential direction. An engaging portion 8b is provided on the inner peripheral surface of the outer cylinder 41a.

[0056] The opening / closing member 42 includes an outer cylinder 42a, an inner cylinder 42b, and an upper wall 42d. The inner cylinder 42b is disposed inside the outer cylinder 42a. The outer cylinder 42a and the inner cylinder 42b are connected via the upper wall 42d. No discharge port for discharging the contents in the inner bag 4 is provided in the upper wall 42d.

[0057] In the state where the discharge port 8d is closed by the opening / closing member 42, the inner cylinder 42b is inserted into the nozzle 8c of the main body member 41 and is in close contact with the inner surface of the nozzle 8c. Further, the bottom surface of the outer cylinder 42a abuts against the upper wall 41d of the main body member 41. From this state, by gripping the outer cylinder 42a and applying an upward force to the opening / closing member 42, the opening / closing member 42 can be separated from the main body member 41 to open the discharge port 8d.

[0058] <Mounting of the mouthpiece mounting member 8> As shown in FIGS. 6 to 7, the mouthpiece mounting member 8 can be mounted on the mouthpiece 5 while supporting the first flange portion 3f1. The mouthpiece mounting member 8 is preferably a plug type. With the first flange portion 3f1 supported, when the mouthpiece mounting member 8 is placed over the protruding portion 4c and a downward force is applied to the mouthpiece mounting member 8 in that state, the engaging portion 8b gets over the axial engaging portion 4ma, and the engaging portion 8b engages with the axial engaging portion 4ma and the circumferential engaging portion 4mb, so that the mouthpiece mounting member 8 can be mounted on the mouthpiece 5.

[0059] <Discharge of the content> The double container 1 is, for example, a squeeze-type container. In this case, the double container 1 is tilted so that the mouth attachment member 8 faces obliquely downward, and in this state, the body 6 is squeezed to discharge the contents in the inner bag 4 through the mouth attachment member 8. When the squeezing of the body 6 is released after the contents are discharged, the outer shell 3 returns to its original shape by the restoring force. At this time, when outside air easily enters the inner bag 4, the outer shell 3 and the inner bag 4 return to their original shapes together. However, when the outer shell easily enters the intermediate space between the inner bag 4 and the outer shell 3, outside air enters this intermediate space, and the outer shell 3 separates from the inner bag 4 and returns to its original shape. When a check valve is provided in the mouth attachment member 8, outside air does not enter the inner bag 4, so the outside air enters the intermediate space. Also, even when a check valve is not provided in the mouth attachment member 8, when the contents are a highly viscous substance, the discharge port 8d may be at least partially blocked by the contents, which may prevent outside air from entering the inner bag 4. This tendency is more prominent as the inner diameter of the discharge port 8d is smaller. Also, when an outside air introduction hole is provided in the outer shell 3, outside air is introduced into the intermediate space through the outside air introduction hole. However, even when an outside air introduction hole is not provided in the outer shell 3, outside air may be introduced into the intermediate space through the gap between the outer shell 3 and the inner bag 4 at the mouth 5. When outside air is introduced into the intermediate space, the amount of air contained in the inner bag 4 decreases accordingly. The smaller the amount of air contained in the inner bag 4, the easier it is for the inner bag 4 to be reduced in diameter when the inner bag 4 is pulled out. Therefore, by configuring so that outside air is easily introduced into the intermediate space, the extractability of the inner bag 4 can be enhanced.

[0060] <Withdrawal of the inner bag 4> The mouth attachment member 8 is engaged with the mouth 5 of the inner bag 4 in the circumferential and axial directions, and is configured such that the inner bag 4 rotates with respect to the outer shell 3 as the mouth attachment member 8 rotates. Then, due to the action of the cam mechanism 31 provided between the inner bag 4 and the outer shell 3, the inner bag 4 is configured to move in the direction of coming out of the container body 2 as the inner bag 4 rotates.

[0061] According to such a configuration, by rotating the mouth-mounted member 8, the inner bag 4 can be moved in a direction of coming out of the container body 2 while being twisted, and then, by pulling the mouth-mounted member 8, the inner bag 4 can be pulled out of the container body 2.

[0062] 1-2. Manufacturing method of the double container 1 The container body 2 can be manufactured by biaxially stretching and blow molding the preform 15 shown in FIG. 11. Further, the double container 1 can be manufactured by attaching the mouth-mounted member 8 to the container body 2.

[0063] <Configuration of the inner preform 14, the outer preform 13, and the preform 15> As shown in FIG. 10, the preform 15 includes an inner preform 14 that becomes the inner bag 4 and an outer preform 13 that becomes the outer shell 3.

[0064] As shown in FIG. 10, the inner preform 14 has a bottomed cylindrical shape and includes a mouth portion 14a, a body portion 14b, and a bottom portion 14c. The bottom portion 14c is provided so as to close the lower end of the body portion 14b. The outer preform 13 has a bottomed cylindrical shape and includes a mouth portion 13a, a body portion 13b, and a bottom portion 13c. The bottom portion 13c is provided so as to close the lower end of the body portion 13b.

[0065] As shown in FIG. 11, the preform 15 can be formed by covering the inner preform 14 with the outer preform 13. In the preform 15, the mouth portion 14a and the mouth portion 13a face each other, and the body portion 14b and the body portion 13b face each other.

[0066] The mouth portions 13a and 14a become the mouth portion 15a of the preform 15, the body portions 13b and 14b become the body portion 15b of the preform 15, and the bottom portions 13c and 14c become the bottom portion 15c of the preform 15. The body portion 15b and the bottom portion 15c are mainly stretched in the biaxial stretch blow molding. The mouth portion 15a hardly deforms during molding and becomes the mouth portion 5 of the container body 2. Regarding the configuration included in the mouth portion 5, the content described above is applicable to the configuration included in the mouth portion 15a as long as it does not go against the gist.

[0067] <Materials and manufacturing methods of the inner preform 14, outer preform 13, and preform 15> The inner preform 14 and the outer preform 13 can be formed by direct blow molding or injection molding using thermoplastic resins such as polyester (e.g., PET) and polyolefin (e.g., polypropylene, polyethylene).

[0068] The outer preform 13 is preferably formed by injection molding. The inner preform 14 is preferably formed by direct blow molding using a cylindrical parison in a molten state. When the inner preform 14 is formed by direct blow molding, a structure in which the concave portion 4c13 is formed on the inner peripheral surface of the axial engagement portion 4ma can be obtained. The inner preform 14 preferably has a multilayer structure.

Explanation of reference numerals

[0069] 1: Double container 2: Container body 2a: Maximum perimeter portion 2a1: Portion 2a2: Portion 2b: Minimum perimeter portion 3: Outer shell 3a: Open end 3a1: Base surface 3a2: Annular convex portion 3a3: Inner bag support surface 3a4: Vertex 3f1: First flange portion 3f2: Second flange portion 3f3: Lower surface 3f4: Central surface 3f5: Upper surface 3g: Concave portion 3l: Cam rail 3m: Concave stripe 4: Inner bag 4a: First cylinder 4b: Second cylinder 4b1: Peripheral wall 4b2: Lower wall 4b3: Corner 4b4: Below 4c: Protrusion 4c13: Recess 4c2: Engaging projection 4c5: Annular projection 4c8: Tapered surface 4d: Inner bag body 4e: Inclined part 4f: Seal cylinder part 4f1: Inner surface 4g: Rib 4m3: Below 4ma: Axial engagement part 4mb: Circumferential engagement part 4o: Diameter-expanded part 5: Mouth part 5c: Open end 6: Barrel part 6b: Shoulder 6c: Barrel body 6d: Inner convex curved part 6e: Outer convex curved part 6f: Boundary part 7: Bottom part 7a: Bottom surface 8: Mouth part mounting member 8a: Cap 8b: Engagement part 8b3: Annular projection 8b4: Tip 8c: Nozzle 8d: Discharge port 13: Outer preform 13a: Mouth part 13b: Barrel part 13c: Bottom part 13d: Open end 13f2: Second flange part 13f3: Below 13l: Cam rail 14: Inner preform 14a: Mouth part 14b: Barrel part 14c: Bottom part 14g: Rib 15: Preform 15a: Mouth part 15b: Barrel part 15c: Bottom 15g: Cam mechanism 31: Cam mechanism 41: Body member 41a: Outer cylinder 41a1: Open end 41b: Inner cylinder 41b1: Outer peripheral surface 41d: Upper wall 41i: Flow-through hole 42: Opening / closing member 42a: Outer cylinder 42b: Inner cylinder 42d: Upper wall 43: Hinge 44: Gap C: Central axis

Claims

1. A double container comprising a container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag, the inner bag is configured to be withdrawable from the container body, the container body includes a mouth portion, a body portion, and a bottom portion, the mouth portion is a cylindrical portion having an open end, the body portion is disposed adjacent to the mouth portion on a side farther from the open end than the mouth portion, and the bottom portion is configured to close the lower end of the body portion, with the direction in which the central axis of the mouth portion of the container body extends being defined as the axial direction, the overall height of the container body being H, the portion of the body portion where the perimeter in a cross-section perpendicular to the axial direction is maximum being defined as the maximum perimeter portion, and the height of the maximum perimeter portion from the bottom surface of the container body being Hmax, the body portion includes a shoulder portion configured such that the perimeter in a cross-section perpendicular to the axial direction increases as it moves away from the mouth portion, Hmax / H is 0.20 to 0.40, a double container wherein, when the major-axis outer diameter that is maximum at the maximum perimeter portion is DLmax and the minor-axis outer diameter perpendicular to the major axis direction is DSm, DSm / DLmax is 0.70 to 0.

95.

2. The double container according to claim 1, wherein the portion of the body portion where the perimeter in a cross-section perpendicular to the axial direction is minimum is defined as the minimum perimeter portion, the height of the minimum perimeter portion from the bottom surface of the container body is Hmin, and when the major-axis outer diameter at the minimum perimeter portion is DLmin, (DLmax - DLmin) / (Hmin - Hmax) is 0.26 to 0.

46.

3. The double container according to claim 2, wherein Hmin / H is 0.80 to 0.

90.

4. The double container according to any one of claims 1 to 3, wherein the body portion includes an inwardly convex curved portion and an outwardly convex curved portion, the outwardly convex curved portion is disposed closer to the bottom surface than the inwardly convex curved portion, the maximum perimeter portion is disposed at the outwardly convex curved portion, a double container wherein, when the height of the boundary portion between the inwardly convex curved portion and the outwardly convex curved portion from the bottom surface is Hb and the major-axis outer diameter at the boundary portion is DLb, (DLmax - DLb) / (Hb - Hmax) is 0.28 to 0.

48.

5. The double container according to claim 4, wherein Hb / H is 0.45 to 0.75.

Images