Double container

Abstract

To provide a double container with enhanced impact resistance.SOLUTION: The double container includes a container body. The container body includes an inner bag and an outer shell disposed to cover the inner bag. The inner bag includes a first cylinder disposed within the outer shell and a second cylinder having a larger outer diameter than the first cylinder and disposed at a position closer to an opening end of the inner bag than the first cylinder. The second cylinder includes a circumferential wall and a bottom wall disposed below the circumferential wall and configured to reduce the diameter of the circumferential wall toward the first cylinder. The inner bag is disposed such that the bottom wall abuts against the outer shell.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dual container. [Background technology]

[0002] Conventionally, a double container having a container body having an outer shell and an inner bag is known. For example, Patent Document 1 discloses a method of manufacturing a container body having an inner bag and an outer shell covering the inner bag by biaxially stretching and blow molding a preform formed by covering an inner preform with an outer preform. In addition, in the container body of Patent Document 1, the inner bag has a protruding portion protruding from the open end of the outer shell, and the protruding portion is provided with an abutting flange that abuts against the open end of the outer shell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-26868 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors conducted a drop test at low temperatures on a double container having a container body with a configuration similar to that of Patent Document 1 and found that when the inner preform was direct blow molded, cracks were likely to occur in the inner bag at the abutting flange.

[0005] The present invention has been made in view of the above circumstances, and provides a double container having improved impact resistance. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided: [1] A double container comprising a container body, the container body comprising an inner bag and an outer shell arranged to cover the inner bag, the inner bag comprising a first tube arranged within the outer shell and a second tube having an outer diameter larger than that of the first tube and arranged closer to the open end of the inner bag than the first tube, the second tube comprising a peripheral wall and a bottom wall provided below the peripheral wall and configured to reduce the diameter of the peripheral wall toward the first tube, the inner bag being arranged so that the bottom wall abuts against the outer shell. [2] A double container according to the above [1], wherein the peripheral wall is covered in part or in whole with the outer shell on the side closer to the bottom wall. [3] The double container according to [1] or [2], wherein the angle of the peripheral wall relative to the lower wall is 90 degrees or more. [4] A double container as described in any one of [1] to [3], wherein the inner bag has an engaging portion at a protruding portion protruding from the opening end of the outer shell that can engage with a mouth attachment member, and the peripheral wall has a length between the lower surface of the lower wall and the lower surface of the engaging portion of 2 mm or more. [5] A double container as described in any one of [1] to [4], the double container comprising a mouth attachment member attached to the mouth of the container body, the mouth attachment member comprising an outer tube, the open end of the outer shell being provided with a base surface facing the open end of the outer tube and a ring-shaped protrusion protruding from the base surface, the ring-shaped protrusion protruding toward the inside of the outer tube. [6] The double container according to [5], wherein the apex of the annular convex portion is higher than the open end of the outer cylinder. [7] A double container comprising a container body and a mouth attachment member attached to the mouth of the container body, wherein the container body comprises an inner bag and an outer shell arranged to cover the inner bag, the inner bag comprises a protrusion protruding from the open end of the outer shell and an engagement portion capable of engaging with the mouth attachment member, and wherein, when the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, the length in the axial direction between the open end of the inner bag and the underside of the engagement portion is 4.0 to 5.0 mm. [8] The double container according to [7], wherein a recess is provided on the inner surface of the engaging portion. [9] A double container as described in [7] or [8], wherein the inner bag has an inclined surface and a sealing tube portion, in that order, closer to the opening end than the lower surface, the inner surface of the sealing tube portion is in close contact with the outer peripheral surface of the inner tube provided on the mouth mounting member, the inclined surface is configured to reduce the diameter of the engagement portion toward the sealing tube portion, and the length between the lower end of the sealing tube portion and the lower surface of the engagement portion is 1.2 to 4.0 mm.

[10] A double container as described in any one of [7] to [9], wherein the inner bag has a sealing tube portion closer to the opening end than the lower surface, the inner surface of the sealing tube portion is in close contact with the outer peripheral surface of the inner tube provided on the mouth mounting member, and when the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, the length in the axial direction between the opening end and the lower end of the sealing tube portion is 0.5 to 3.3 mm.

[11] A double container having a container body, the container body having an inner bag and an outer shell arranged to cover the inner bag, the inner bag and the outer shell being provided with a cam mechanism that moves the inner bag in a direction of removing it from the container body by rotating the inner bag relative to the outer shell, the outer peripheral surface of the outer shell being provided with first and second flange portions in that order from the opening end side of the outer shell, and the cam mechanism being arranged so that the lower end of the cam mechanism is closer to the opening end than the lower surface of the second flange portion.

[12] A double container according to

[11] , wherein the first flange portion is configured such that the opening end has an expanded diameter.

[13] A double container as described in

[11] or

[12] , wherein the double container is provided with a mouth attachment member attached to the mouth of the container body, and the first flange portion does not engage with the mouth attachment member. Effect of the Invention

[0007] In the double container of the present invention, the lower wall of the second cylinder is abutted against the outer shell, thereby preventing the inner bag from penetrating into the outer shell. Therefore, unlike the abutment flange in Patent Document 1, the inner bag is locally bent and does not have any areas that are prone to cracking when impact is applied, thereby improving impact resistance. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a double container 1 according to a first embodiment of the present invention. The dashed and dotted lines in the figure represent the boundary lines at which the curvature of the faces that make up the surface shape changes. The same is true for the other figures. [Diagram 2] FIG. 2 is an exploded perspective view of the double container 1 of FIG. [Diagram 3] Fig. 3A is a longitudinal cross-sectional view of the double container 1 of Fig. 1 with the overcap 42 closed. Fig. 3B is an enlarged view of region B in Fig. 3A. [Figure 4] FIG. 3B is an exploded view of FIG. 3A with the overcap 42 slightly open. [Diagram 5] 5 is a divided view of the container body 2 in FIG. 4. FIG. [Figure 6] FIG. 3 is an exploded perspective view of the vicinity of the mouth portion 5 in FIG. 2. [Figure 7] Fig. 7A is a perspective view of the cap body 41 of the mouth-mounted member 8 in Fig. 2, seen from a different angle. Fig. 7B is a cross-sectional perspective view of the cap body 41 in Fig. 7A cut in half. [Figure 8] FIG. 2 is a perspective view showing a state in which the inner preform 14 and the outer preform 13 are separated. [Figure 9] 1 is a perspective view of a preform 15 formed by covering an inner preform 14 with an outer preform 13. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described. The various features shown in the following embodiments can be combined with each other. Each feature can be an independent invention. In the following embodiments, elements that are not specified in the claims are optional elements and can be omitted.

[0010] 1. First embodiment The double container according to the first embodiment of the present invention will be described with reference to Figs. 1 to 9. In the following description, terms related to directions such as "upper" and "lower" refer to directions when the bottom 7 is in contact with the ground. In addition, in the following description, the "axial direction" refers to the direction in which the central axis C (shown in Fig. 2) of the mouth 5 extends, in other words, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" refers to the direction of rotation about the central axis C of the mouth 5, in other words, the direction in which the inner bag 4 is rotated relative to the outer shell 3 at the mouth 5. "Clockwise" and "counterclockwise" refer to directions as viewed from the top of the double container 1, unless otherwise specified.

[0011] 1-1. Structure of double container 1 As shown in Fig. 1, the double container 1 of the first embodiment of the present invention comprises a container body 2 and a mouth attachment member 8. Each component will be described in detail below.

[0012] <Basic configuration of container body 2> As shown in Figures 2 and 3, the container body 2 has a mouth 5, a body 6, and a bottom 7. The mouth 5 is a tubular (preferably 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. The mouth 5 has an engagement portion 4m to which a mouth attachment member 8 can be attached.

[0013] The body 6 is disposed adjacent to the mouth 5 on the side farther from the open end 5c than the mouth 5. The body 6 has a larger outer diameter (in this specification, "outer diameter" means a circular equivalent diameter when the cross section is not circular) than the mouth 5. The body 6 is cylindrical, and the bottom 7 is provided at the lower end of the body 6 and closes the lower end of the body 6. The body 6 has a shoulder 6b whose outer diameter increases with increasing distance from the mouth 5. The body 6 also has a body main body 6c on the bottom 7 side of the shoulder 6b. The body main body 6c has a shape in which the outer diameter is approximately constant toward the bottom 7, or a shape in which the diameter decreases toward the bottom 7, for example.

[0014] 3 to 6, the container body 2 includes an inner bag 4 and an outer shell 3 arranged to cover the inner bag 4. The inner bag 4 has an inner bag body 4d other than the protruding portion 4c housed within the outer shell 3. In the following description, the portions of the inner bag 4 that correspond to the mouth 5, body 6, and bottom 7 of the container body 2 will be referred to as the mouth 5, body 6, and bottom 7 of the inner bag 4, respectively. The same applies to the outer shell 3.

[0015] <Detailed structure of outer shell 3 and inner bag 4> As shown in Fig. 4, the inner bag 4 has a protruding portion 4c protruding from the open end 3a of the outer shell 3. As shown in Figs. 5 and 6, the inner bag 4 has a first tube 4a and a second tube 4b. The first tube 4a is disposed inside the outer shell 3. The second tube 4b has an outer diameter larger than that of the first tube 4a and is disposed at a position closer to the open end 5c of the inner bag 4 than the first tube 4a. The second tube 4b may be entirely disposed outside the outer shell 3, or a part or all of the second tube 4b may be disposed inside the outer shell 3 and the remainder may be disposed outside the outer shell 3.

[0016] As shown in FIG. 5, the second tube 4b includes a peripheral wall 4b1 and a bottom wall 4b2 that is provided below the peripheral wall 4b1 and is configured to reduce the diameter of the peripheral wall 4b1 toward the first tube 4a. The inner bag 4 is disposed so that the bottom wall 4b2 abuts against the outer shell 3. The bottom wall 4b2 abuts against the outer shell 3 to prevent the inner bag 4 from entering the outer shell 3. The peripheral wall 4b1 preferably extends parallel to the axial direction. In addition, the angle α of the peripheral wall 4b1 with respect to 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, making it difficult to break when an impact is applied, thereby improving impact resistance. The length L1 between the bottom surface 4b4 of the bottom wall 4b2 and the bottom surface 4m3 of the engagement portion 4m described later 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, and 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 a range between any two of the numerical values ​​exemplified here. The length of the peripheral wall 4b1 from the lower surface 4b4 of the portion parallel to the axial direction is preferably within the above numerical range, and the peripheral wall 4b1 is preferably parallel to the axial direction between the lower surface 4b4 and the lower surface 4m3.

[0017] The open end 3a of the outer shell 3 is provided with a base surface 3a1, an annular protrusion 3a2, and an inner bag support surface 3a3. The base surface 3a1 is preferably annular. The annular protrusion 3a2 is disposed inside the base surface 3a1 and protrudes from the base surface 3a1 in the axial direction. Preferably, as shown in Figs. 3 and 4, the base surface 3a1 faces the open end 41a1 of the outer tube 41a of the mouth-mounted member 8, and the annular protrusion 3a2 protrudes toward the inside of the outer tube 41a of the mouth-mounted member 8. With this configuration, even if the contents in the inner bag 4 get into the gap 44 between the base surface 3a1 and the open end 41a1, the annular protrusion 3a2 prevents the contents from entering between the inner bag 4 and the outer shell 3. In addition, it is preferable that the apex 3a4 of the annular protrusion 3a2 is higher than the open end 41a1. In this case, the intrusion of the contents is further prevented.

[0018] The inner bag support surface 3a3 is a surface that the lower wall 4b2 abuts against. The inner bag support surface 3a3 is preferably annular. The lower wall 4b2 abuts against the inner bag support surface 3a3, so that the inner bag 4 is supported by the outer shell 3 and the inner bag 4 is prevented from entering the outer shell 3. The inner bag support surface 3a3 is disposed inside the base surface 3a1 and the annular protrusion 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 close to the lower wall 4b2 is covered by the outer shell 3, and the lower wall 4b2 and the corners 4b3 are necessarily covered by the outer shell 3. As a result, the corners 4b3, which have relatively low impact resistance, are protected by the outer shell 3, and the impact resistance of the inner bag 4 is further improved.

[0019] As shown in Fig. 4, the inner bag 4 has an engagement portion 4m that can engage with the mouth-mounting member 8 at a protruding portion 4c that protrudes from the open end 3a of the outer shell 3. As shown in Fig. 5, the engagement portion 4m is provided so as to protrude radially outward from the peripheral wall 4b1. As shown in Fig. 4, an engagement portion 8b that can engage with the engagement portion 4m is provided on the inner peripheral surface of the outer tube 41a of the mouth-mounting member 8, and the mouth-mounting member 8 is attached to the mouth 5 by engaging the engagement portion 8b with the engagement portion 4m. As shown in Fig. 5, a recess 4c13 is provided on the inner peripheral surface of the engagement portion 4m.

[0020] As shown in Fig. 6, the engaging portion 4m preferably includes an annular protrusion 4c5 and an engaging protrusion 4c2. The annular protrusion 4c5 engages with the engaging portion 8b of the mouth mounting member 8 in the axial direction. The engaging protrusion 4c2 engages with the mouth mounting member 8 in the circumferential direction. The engagement between the engaging protrusion 4c2 and the mouth mounting member 8 may be a concave-convex engagement or a frictional engagement. The engaging protrusion 4c2 may be omitted, in which case it is preferable that the annular protrusion 4c5 and the mouth mounting member 8 frictionally engage in the circumferential direction.

[0021] The engaging protrusions 4c2 are preferably provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engaging protrusions 4c2 are disposed on the annular protrusion 4c5 and are provided so as to protrude radially outward from the annular protrusion 4c5. The annular protrusion 4c5 and the engaging protrusions 4c2 are provided with a tapered surface 4c8 on the upper surface. This makes it easier for the engaging portion 8b, which is preferably annular and provided on the mouth attachment member 8, to climb over the annular protrusion 4c5 and the engaging protrusions 4c2 when the mouth attachment member 8 is attached.

[0022] As shown in Fig. 5, the length L2 between the open end 5c of the inner bag 4 and the lower surface 4m3 of the engagement portion 4m in the axial direction is preferably 4.0 to 5.0 mm. The F-port standard specifies that the length L2 is 4.5 mm, and by setting the length L2 in the above range, a mouth-attaching member 8 that complies with the F-port standard can be used. Various mouth-attaching members 8 that comply with the F-port standard are commercially available and are highly available. Specifically, the length L2 may be, for example, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, or 5.0 mm, or may be in a range between any two of the numerical values ​​exemplified here.

[0023] The inner bag 4 has an inclined portion 4e and a cylindrical seal portion 4f, in this order, closer to the opening end 5c than the lower surface 4m3. As shown in Figs. 3 and 4, the inner surface of the cylindrical seal portion 4f is in close contact with the outer circumferential surface 41b1 of the inner tube 41b provided in the mouth mounting member 8. This prevents the contents in the inner bag 4 from leaking. The inclined portion 4e is configured to reduce the diameter of the engaging portion 4m toward the cylindrical seal portion 4f. As shown in Fig. 5, the length L3 between the lower end of the cylindrical seal portion 4f and the lower surface 4m3 of the engaging portion 4m in the axial direction is preferably 1.2 to 4.0 mm. By setting the length L3 in this range, it becomes easier to set the length L2 in the above range. Specifically, the length L3 may be, 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, or 4.0 mm, or may be in a range between any two of the numerical values ​​exemplified here.

[0024] The length L4 between the opening end 5c and the lower end of the cylindrical seal portion 4f in the axial direction, and the length L5 of the cylindrical seal portion 4f are preferably 0.5 to 3.3 mm. By setting the lengths L4 and L5 in this range, it becomes easier to set the lengths L2 and L3 in 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, and 3.3 mm, respectively, and may be in a range between any two of the numerical values ​​exemplified here.

[0025] The engagement portion 4m preferably has a protruding length L6 from the peripheral wall 4b1 of 0.60 to 1.85 mm. In this case, there is an advantage that L2 to L4 can be easily set in the above range. 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, or 1.85 mm, or may be in a range between any two of the numerical values ​​exemplified here.

[0026] In order to meet F-port standards, it is preferable to meet at least one of the following dimensions. The outer diameter of the engagement portion 4m is 30.5 to 33.8 mm (preferably 31.8 to 33.3 mm, and more preferably 32.3 to 33.3 mm. In this embodiment, it is 32.8 mm). The outer diameter of the inner bag 4 at the open end 5c 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 circumferential surface of the cylindrical seal portion 4f is 28.1 to 30.1 mm (preferably, 28.6 to 29.6 mm. In this embodiment, it is 29.1 mm).

[0027] 6, a ridge 4g is provided on the outer circumferential surface of the inner bag 4 (more specifically, the inner bag main body 4d). The lower surface of the ridge 4g is inclined so as to approach the open end 5c in the counterclockwise direction.

[0028] A plurality of ridges 4g are provided on the outer peripheral surface of the inner bag 4, and the start and end points of the plurality of ridges 4g are offset from each other in the circumferential direction. In this embodiment, two ridges 4g are arranged offset from each other by 180 degrees in the circumferential direction. The angle at which each ridge 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 this embodiment). Specifically, this angle may be, 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, or 180 degrees, or may be in a range between any two of the values ​​exemplified here.

[0029] A cam rail 3l is provided on the inner peripheral surface of the outer shell 3. A recessed strip 3m that can engage with the protruding strip 4g is provided in a portion of the cam rail 3l. The recessed strip 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 advances in the counterclockwise direction. The protruding strip 4g and the recessed strip 3m are configured to be engageable by rotating the inner bag 4 clockwise relative to the outer shell 3, and to be disengaged by rotating the inner bag 4 counterclockwise relative to the outer shell 3. The recessed strip 3m is configured as a non-through hole. In this case, cracks are less likely to occur in the outer shell 3 than when the recessed strip 3m is configured as a through hole.

[0030] A plurality of cam rails 3l are provided on the inner peripheral surface of the outer shell 3, and the start points and end points of the plurality of cam rails 3l are offset from each other in the circumferential direction. In this embodiment, two cam rails 3l are disposed offset by 180 degrees in the circumferential direction. The angle at 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 this embodiment). Specifically, this angle may be, 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, or 360 degrees, or may be in a range between any two of the values ​​exemplified here.

[0031] The recessed strip 3m is preferably provided on each cam rail 3l. The angle at which the recessed strip 3m extends is the same as the angle at which the protruding strip 4g extends.

[0032] The container body 2 is preferably provided with a rotation restricting structure that restricts relative rotation between the inner bag 4 and the outer shell 3. Examples of the rotation restricting structure include a structure that increases the frictional force between the inner bag 4 and the outer shell 3, and a structure that engages the inner bag 4 and the outer shell 3 in a circumferential direction.

[0033] Before the inner bag 4 is pulled out from the container body 2, the lower surface of the ridge 4g abuts against the upper surface of the cam rail 3l within the groove 3m. The ridge 4g and the cam rail 3l form a cam mechanism 31. When the inner bag 4 is rotated counterclockwise relative to the outer shell 3, the cam mechanism 31 causes the inner bag 4 to be displaced in a direction that allows it to come out of the container body 2. At this time, the inner bag 4 is twisted and reduced in diameter. The cam mechanism 31 has an inclined structure in the same direction as a positive screw.

[0034] As shown in Figs. 5 and 6, the outer circumferential surface of the outer shell 3 is provided with first and second flanges 3f1 and 3f2 in this order from the opening end 3a of the outer shell 3. The cam mechanism 31 is preferably disposed so 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 3f2. The container body 2 is formed by biaxially stretching and blow molding the preform 15 shown in Figs. 8 and 9, and the second flange 13f2 and the cam mechanism 15g of the preform 15 become the second flange 3f2 and the cam mechanism 31 of the container body 2 after molding. The cam mechanism 15g is composed of the convex strip 14g of the inner preform 14 and the cam rail 13l of the outer preform 13. Since the preform 15 is mainly stretched by heating the bottom 15c side of the second flange portion 13f2, the cam mechanism 15g is arranged closer to the opening end 13d of the outer preform 13 than the lower surface 13f3 of the second flange portion 13f2, so that the shape of the cam mechanism 15g provided on the preform 15 is prevented from collapsing during molding. Similarly, it is preferable that the concave strip 3m and the convex strip 4g, and the portions of the preform 15 corresponding to the concave strip 3m and the convex strip 4g are arranged closer to the opening ends 3a and 13d than the lower surfaces 3f3 and 13f3 of the second flange portions 3f2 and 13f2.

[0035] As shown in FIG. 5, the first flange portion 3f1 is configured with the opening end 3a expanded. A recess 3g is preferably provided on the inner peripheral surface of the first flange portion 3f1. The lower surface of the recess 3g becomes the inner bag support surface 3a3. The F-mouth standard specifies 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 attached is 10.2 mm. For this reason, if one flange portion provided on the outer shell 3 is to comply with the F-mouth cap standard, the position of the flange portion needs to be provided at the opening end 3a or a position adjacent thereto, as with the first flange portion 3f1, and in that case, heat is easily applied to the cam mechanism 15g provided on the preform 15 during molding, and the shape of the cam mechanism 15g is easily distorted during molding. On the other hand, in this embodiment, the first and second flange portions 3f1 and 3f2 are provided, so that the shape of the cam mechanism 15g provided on the preform 15 is prevented from distorting during molding. The first flange portion 3f1 is provided as a support ring, and it is preferable that the first flange portion 3f1 does not engage with the mouth attachment member 8.

[0036] The length L7 between the lower surfaces of the first and second flange portions 3f1, 3f2 in the axial direction is, for example, 3 to 9 mm, and preferably 4.5 to 7.5 mm (6 mm in this embodiment).Specific examples of the length L7 are 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, and 9.0 mm, and may be in the range between any two of the numerical values ​​exemplified here.

[0037] <Configuration of Mouth-mounted Member 8> The mouth attachment member 8 is a member that is attached to the mouth 5 of the container body 2. In this embodiment, the mouth attachment member 8 is a cap 8a, but may be another member such as a pump. As shown in FIG. 4, the mouth attachment member 8 has an engagement portion 8b that can engage with the engagement portion 4m. The engagement portion 8b is preferably an annular protrusion 8b3. The mouth attachment member 8 preferably has a discharge port 8d for discharging the contents in the inner bag 4. In addition, the mouth attachment member 8 preferably has a nozzle 8c.

[0038] The cap 8a preferably includes a cap body 41 and an overcap 42. The cap body 41 is configured to be able to engage with the protruding portion 4c, and includes an outlet 8d. The overcap 42 is configured to be able to open and close the outlet 8d. FIG. 3 shows a closed state in which the outlet 8d is closed, and FIG. 4 shows an open state in which the outlet 8d is open. In this embodiment, the cap body 41 and the overcap 42 are connected by a hinge 43, but they do not have to be connected. The overcap 42 is preferably able to engage with the cap body 41 by a screw or a snap fit.

[0039] The cap body 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 flow hole 41i is provided in the upper wall 41d, and the flow passage of the inner cylinder 41b and the nozzle 8c are connected through the flow 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 sealing cylinder portion 4f. Therefore, the inner cylinder 41b and the sealing cylinder portion 4f are frictionally engaged in the circumferential direction. An engagement portion 8b is provided on the inner peripheral surface of the outer cylinder 41a.

[0040] The overcap 42 includes an outer tube 42a, an inner tube 42b, and an upper wall 42d. The inner tube 42b is disposed inside the outer tube 42a. The outer tube 42a and the inner tube 42b are connected via the upper wall 42d. The upper wall 42d is not provided with a discharge port for discharging the contents in the inner bag 4.

[0041] With the discharge port 8d closed by the overcap 42, the inner tube 42b is inserted into the nozzle 8c of the cap body 41 and is in close contact with the inner surface of the nozzle 8c. In addition, the bottom surface of the outer tube 42a abuts against the upper wall 41d of the cap body 41. From this state, by gripping the outer tube 42a and applying an upward force to the overcap 42, the overcap 42 can be separated from the cap body 41 to open the discharge port 8d.

[0042] <Attachment of mouth attachment member 8> 3 and 4, the mouth attachment member 8 can be attached to the mouth 5 with the first flange portion 3f1 supported. The mouth attachment member 8 is preferably of a plug type, and when the mouth attachment member 8 is placed over the protruding portion 4c with the first flange portion 3f1 supported and a downward force is applied to the mouth attachment member 8 in this state, the engaging portion 8b overcomes the engaging portion 4m, and the engaging portion 8b and the engaging portion 4m engage with each other in the circumferential and axial directions, so that the mouth attachment member 8 can be attached to the mouth 5.

[0043] <Removing 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 so that the inner bag 4 rotates relative to the outer shell 3 as the mouth attachment member 8 rotates. The inner bag 4 is configured to move in a direction coming out of the container body 2 as the inner bag 4 rotates due to the action of a cam mechanism 31 provided between the inner bag 4 and the outer shell 3.

[0044] According to this configuration, by rotating the mouth attachment member 8, the inner bag 4 can be moved in a direction that allows it to be removed from the container body 2 while being twisted, and then by pulling the mouth attachment member 8, the inner bag 4 can be pulled out of the container body 2. Note that the inner bag 4 may be separated from the container body 2 by pulling it in the axial direction without twisting it. In this case, the mouth attachment member 8 may not be engaged with the mouth 5 of the inner bag 4 in the circumferential direction, but may be engaged only in the axial direction.

[0045] 1-2. Manufacturing method of double container 1 The container body 2 can be manufactured by biaxially stretching and blow molding a preform 15 shown in Fig. 9. In addition, the double container 1 can be manufactured by attaching the mouth attachment member 8 to the container body 2.

[0046] <Configuration of inner preform 14, outer preform 13, and preform 15> As shown in FIG. 8, the preform 15 includes an inner preform 14 which becomes the inner bag 4 and an outer preform 13 which becomes the outer shell 3 .

[0047] As shown in Fig. 8, the inner preform 14 is a cylindrical shape with a bottom, 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 is a cylindrical shape with a bottom, 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.

[0048] 9, a preform 15 can be formed by covering the inner preform 14 with the outer preform 13. In the preform 15, the mouth portion 14a faces the mouth portion 13a, and the body portion 14b faces the body portion 13b.

[0049] 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 is hardly deformed during molding and becomes the mouth portion 5 of the container body 2. The above-mentioned contents regarding the configuration included in the mouth portion 5 can also be applied to the configuration included in the mouth portion 15a as long as it is not contrary to the spirit thereof.

[0050] <Materials and manufacturing methods of 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 a thermoplastic resin such as polyester (eg, PET) or polyolefin (eg, polypropylene, polyethylene).

[0051] The outer preform 13 is preferably formed by injection molding. The inner preform 14 is preferably formed by direct blow molding using a molten cylindrical parison. When the inner preform 14 is formed by direct blow molding, a structure in which a recess 4c13 is formed on the inner peripheral surface of the engagement portion 4m can be obtained. The inner preform 14 is preferably of a multi-layer structure.

[0052] 2. Other embodiments The direction in which each member is rotated relative to the above embodiment may be reversed. In the above embodiment, the inner bag 4 is displaced in a direction to come out of the container body 2 by rotating the clockwise thread in the loosening direction, but the inner bag 4 may be displaced in a direction to come out of the container body 2 by rotating the counterclockwise thread in the loosening direction. [Explanation of symbols]

[0053] 1:Double container 2: Container body 3: Outer shell 3a: Open end 3a1: Base surface 3a2: Annular protrusion 3a3: Inner bag support surface 3a4 : Vertex 3f1: First flange section 3f2: Second flange part 3f3: Bottom surface 3f4: Center plane 3f5:Top surface 3g: Concave 3l: Cam rail 3m: Concave 4: Inner bag 4a: 1st tube 4b: 2nd cylinder 4b1: Peripheral wall 4b2 :Bottom wall 4b3 : Corner 4b4:Bottom surface 4c:Protrusion 4c13: Recess 4c2: Engagement convex part 4c5: Circular convex part 4c8: Tapered surface 4d: Inner bag body 4e: Inclined part 4f: Seal cylinder 4f1:Inner surface 4g: Convex stripe 4m: Engagement part 4m3: bottom surface 5: Mouth 5c: Open end 6: Torso 6b:Shoulder 6c: Main body 7: Bottom 8: Mouth attachment member 8a: Cap 8b: Engagement part 8b3: Circular convex part 8c: Nozzle 8d:Discharge port 13: Outer preform 13a: Mouth 13b: Torso 13c: Bottom 13d: Open end 13f2: Second flange part 13f3: Bottom surface 13l: Cam rail 14: Inner preform 14a: Mouth 14b: Torso 14c: Bottom 14g: Convex strip 15: Preform 15a: Mouth 15b: Torso 15c: bottom 15g: Cam mechanism 31: Cam mechanism 41: Cap body 41a: Outer cylinder 41a1: Open end 41b: Inner cylinder 41b1: Outer surface 41d: Upper wall 41i :Flow hole 42: Overcap 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, The container body includes an inner bag and an outer shell arranged to cover the inner bag. the inner bag includes a first tube disposed within the outer shell, and a second tube having an outer diameter larger than that of the first tube and disposed closer to an open end of the inner bag than the first tube, The second cylinder includes a peripheral wall and a lower wall provided below the peripheral wall and configured to reduce the diameter of the peripheral wall toward the first cylinder, The inner bag is positioned such that the lower wall abuts against the outer shell.

2. The double container according to claim 1, A double container, wherein a part or all of the peripheral wall on the side closer to the bottom wall is covered with the outer shell.

3. The double container according to claim 1, A double container, wherein the angle of the peripheral wall with respect to the lower wall is 90 degrees or more.

4. The double container according to claim 1, The inner bag has an engagement portion that is capable of engaging with a mouth attachment member at a protrusion that protrudes from an open end of the outer shell, The peripheral wall has a length between the lower surface of the lower wall and the lower surface of the engagement portion of 2 mm or more.

5. The double container according to any one of claims 1 to 4, The double container includes a mouth attachment member attached to the mouth of the container body, The mouth-mounted member includes an outer tube, The open end of the outer shell is provided with a base surface facing the open end of the outer cylinder and an annular protrusion protruding from the base surface, The annular protrusion protrudes toward the inside of the outer cylinder.

6. The double container according to claim 5, A double container, wherein the apex of the annular convex portion is higher than the open end of the outer cylinder.

7. A double container comprising a container body and a mouth attachment member attached to a mouth of the container body, The container body includes an inner bag and an outer shell arranged to cover the inner bag. The inner bag has an engagement portion that is capable of engaging with the mouth attachment member at a protrusion that protrudes from an open end of the outer shell, If the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, The double container has a length in the axial direction between the open end of the inner bag and the lower surface of the engagement portion of 4.0 to 5.0 mm.

8. The double container according to claim 7, The double container has a recess on the inner surface of the engagement portion.

9. The double container according to claim 7, the inner bag includes an inclined surface and a cylindrical seal portion in this order on the opening end side of the lower surface, The inner surface of the cylindrical seal portion is in close contact with the outer circumferential surface of the inner cylinder provided in the mouth mounting member, The inclined surface is configured to reduce a diameter of the engagement portion toward the tubular seal portion, The double container has a length between the lower end of the sealing tube portion and the lower surface of the engagement portion of 1.2 to 4.0 mm.

10. The double container according to any one of claims 7 to 9, the inner bag includes a cylindrical seal portion closer to the opening end than the lower surface, The inner surface of the cylindrical seal portion is in close contact with the outer circumferential surface of the inner cylinder provided in the mouth mounting member, If the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, The double container has a length in the axial direction between the opening end and the lower end of the cylindrical seal portion of 0.5 to 3.3 mm.

11. A double container comprising a container body, The container body includes an inner bag and an outer shell arranged to cover the inner bag. a cam mechanism is provided on the inner bag and the outer shell for moving the inner bag in a direction to come out of the container body by rotating the inner bag relative to the outer shell, A first flange portion and a second flange portion are provided on an outer peripheral surface of the outer shell in this order from an opening end side of the outer shell, The cam mechanism is positioned so that a lower end of the cam mechanism is closer to the opening end than a lower surface of the second flange portion.

12. The double container according to claim 11, The first flange portion is configured such that the opening end has an enlarged diameter.

13. The double container according to claim 11 or 12, The double container includes a mouth attachment member attached to the mouth of the container body, The first flange portion does not engage with the mouth attachment member.

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