Discharge container

Abstract

To provide a discharge container having improved sealing performance between an inner container and a discharge cap.SOLUTION: A discharge container 1 includes a container body 4 in which an inner container 2 capable of containing a liquid is disposed inside an outer container 3, and a discharge cap 5 attached to a mouth portion 4a of the container body 4. The container body 4 is a stretch-blow molded container obtained by stacking an injection-molded preform for the inner container and an injection-molded preform for the outer container inside and outside, and stretch blow-molding them. The mouth portion 4a of the container body 4 is formed by placing a flange 2c provided on a mouth portion 2a of the inner container 2 on an upper end of a mouth portion 3a of the outer container 3. An inner circumferential surface F2 of the mouth portion 2a of the inner container 2 is sealed by a seal portion S provided on the discharge cap 5. The seal portion S seals the inner circumferential surface F2 of the mouth portion 2a of the inner container 2 at a position below an upper end of the outer container 3. An upper end position of the seal portion S is the same as, or lower than, an upper end position of the mouth portion 3a of the outer container 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventional discharge containers include, for example, a container body in which an inner container capable of holding a liquid content is placed inside an outer container, and a discharge cap attached to the mouth of the container body, wherein the container body is a stretch-blow molded container that is formed by stretch-blowing an injection-molded preform for the inner container and an injection-molded preform for the outer container that are stacked inside and outside, and the mouth of the container body is formed by placing a flange provided on the mouth of the inner container on the upper end of the mouth of the outer container, and the inner surface of the mouth of the inner container is sealed by a seal provided on the discharge cap (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-172371 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional dispensing containers described above have room for improvement in the sealing performance between the mouth of the inner container and the dispensing cap.

[0005] An object of the present invention is to provide a dispensing container having an improved sealing property between the inner container and the dispensing cap. [Means for solving the problem]

[0006] (1) The present invention provides a discharge container comprising a container body in which an inner container capable of holding a liquid content is placed inside an outer container, and a discharge cap attached to the mouth of the container body, wherein the container body is a stretch-blow molded container formed by stretch-blowing an injection-molded preform for the inner container and an injection-molded preform for the outer container that are stacked inside and outside, the mouth of the container body being formed by placing a flange provided on the mouth of the inner container on the upper end of the mouth of the outer container, and the inner circumferential surface of the mouth of the inner container being sealed by a seal provided on the discharge cap, wherein the seal is provided at a position lower than the upper end of the mouth of the outer container so as to seal the inner circumferential surface of the mouth of the inner container, and the position of the upper end of the seal is the same as or lower than the position of the upper end of the mouth of the outer container.

[0007] (2) In the discharge container of (1) above, it is preferable that the inner circumferential surface of the mouth of the inner container, where the flange portion is located, is a tapered surface that slopes radially inward as it extends downward.

[0008] (3) In the dispensing container of (2) above, it is preferable that the tapered surface is inclined in a region radially inward from the inner circumferential surface of the mouth of the outer container.

[0009] (4) In any one of the above-mentioned (1) to (3) discharge containers, the discharge cap comprises an inner plug having a flow hole communicating with the inner container and a suck-back mechanism; a discharge valve capable of opening and closing the flow hole of the inner plug; a cap body having a discharge hole communicating with the flow hole via the discharge valve and attached to the mouth of the outer container; and an outside air introduction valve capable of opening and closing between an air vent provided in the mouth of the outer container and an outside air introduction hole provided in the cap body, and the sealing portion can be provided on the inner plug. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a discharge container with improved sealing performance between the inner container and the discharge cap. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing a main part of a discharge container according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view showing an area X in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a discharge container according to one embodiment of the present invention will be described with reference to the drawings.

[0013] 1, reference numeral 1 denotes a discharge container according to one embodiment of the present invention. The discharge container 1 includes a container body 4 in which an inner container 2 capable of containing a liquid is placed inside an outer container 3, and a discharge cap 5 attached to a mouth portion 4a of the container body 4.

[0014] The container body 4 is a stretch-blow molded container formed by stacking an injection-molded preform for an inner container used to form the inner container 2 and an injection-molded preform for an outer container used to form the outer container 3 inside and outside, and stretch-blowing them together.

[0015] In this embodiment, the container body 4 is a delaminating container (delamination bottle) in which the inner container 2 is peelably laminated on the inner surface of the outer container 3. Specifically, the container body 4 is formed by forming a preform for the outer container and a preform for the inner container in advance by injection molding or the like, combining these in a double layer (inner and outer), and then biaxially stretching blow molding them. However, the container body 4 can also be formed by first biaxially stretching blow molding the preform for the outer container to form the outer container, then placing the preform for the inner container inside, and then biaxially stretching blow molding the preform for the inner container.

[0016] The material of the inner container 2 and the outer container 3 can be, for example, PET (polyethylene terephthalate) resin. However, the materials of the inner container 2 and the outer container 3 can be the same or different, as long as they are a separable combination.

[0017] In FIG. 1 , axis O is the central axis of the discharge container 1. In this embodiment, the central axis of the container body 4 and the central axis of the discharge cap 5 are coaxial with axis O. Here, "lower side" refers to the side of the container body 4 along axis O, and "upper side" refers to the side of the discharge cap 5 along axis O. Furthermore, "axial direction" refers to the direction in which axis O extends. Furthermore, "axial direction" (also referred to as "radial direction") refers to a direction perpendicular to the axial direction (up-down direction). Furthermore, "axial direction inner side" (also referred to as "radial inner side") refers to the side closer to axis O in the axial direction (radial direction), and "axial direction outer side" (also referred to as "radial outer side") refers to the side farther from axis O in the axial direction (radial direction). Furthermore, "circumferential direction" refers to the circumferential direction of axis O.

[0018] In this embodiment, the container body 4 is a so-called squeeze container. In this embodiment, the container body 4 is a resin bottle container that can be deformed and restored. In this embodiment, the container body 4 includes a mouth portion 4a, a neck portion 4b connected to the mouth portion 4a, a shoulder portion (not shown) connected to the neck portion 4b, and a body portion (not shown) connected to the shoulder portion. The lower end of the body portion of the container body 4 is closed by a bottom portion (not shown). In this embodiment, the outer shape of the container body 4 is mainly formed by the outer container 3.

[0019] The mouth 4a of the container body 4 is composed of the mouth 2a of the inner container 2 and the mouth 3a of the outer container 3. In this embodiment, the mouth 4a of the container body 4, together with the neck 4b, is formed so as to extend upward from the upper end opening of the shoulder portion.

[0020] In this embodiment, a bead ring 4c is provided at the mouth portion 4a of the container body 4. The bead ring 4c is provided on the outer container 3. The bead ring 4c protrudes radially outward from the outer container 3 and extends annularly around the entire circumferential direction. In this embodiment, the bead ring 4c forms the lower end of the mouth portion 4a of the container body 4, and the portion below the bead ring 4c is configured as a neck portion 4b up to the shoulder portion.

[0021] Furthermore, a male thread 4s is provided at the mouth 4a of the container body 4. The male thread 4s is provided at the mouth 3a of the outer container 3. In addition, a vent A3 is provided at the mouth 3a of the outer container 3. The vent A3 radially penetrates the mouth 3a of the outer container 3, connecting the gap C1 formed between the inner container 2 and the outer container 3 with the gap C2 formed between the outer container 3 and the discharge cap 5. In this embodiment, the vent A3 is located between the male thread 4s and the bead ring 4c. At least one vent A3 is arranged circumferentially at the mouth 3a of the outer container 3. In this embodiment, two vents A3 are arranged at the mouth 3a of the outer container 3 at positions opposite each other across the axis O. Note that in this embodiment, the vent A3 is formed by intermittently forming the male thread 4s at the portion where the vent A3 is arranged.

[0022] In this embodiment, a neck ring 4d is provided on the neck portion 4b of the container body 4. In this embodiment, the neck ring 4d is also provided on the outer container 3. The neck ring 4d is located lower than the bead ring 4c. The neck ring 4d also protrudes radially outward from the outer container 3 and extends annularly around the entire circumferential direction. In this embodiment, the diameter of the neck ring 4d is larger than the diameter of the bead ring 4c.

[0023] The mouth 4a of the container body 4 is formed by placing the flange 2c provided on the mouth 2a of the inner container 2 on the upper end 3e of the mouth 3a of the outer container 3.

[0024] The flange 2c of the inner container 2 is placed on the upper end 3e of the mouth 3a of the outer container 3, thereby closing the upper open end of the mouth 3a of the outer container 3 from above. In this embodiment, the flange 2c is formed by protruding radially outward from the upper end of the mouth 2a of the inner container 2 and extending annularly around the entire circumferential direction. That is, in this embodiment, the flange 2c is an annular flange 2c that protrudes radially outward from the upper end of the mouth 2a of the inner container 2 and extends annularly around the entire circumferential direction.

[0025] In this embodiment, the neck 2b of the inner container 2 is provided with multiple guide ribs 2d. The guide ribs 2d protrude radially outward from the neck 2b of the inner container 2 and extend vertically. In this embodiment, multiple guide ribs 2d are arranged at intervals around the circumferential direction of the neck 2b of the inner container 2. In this embodiment, the guide ribs 2d form a gap C1 between the neck 2b of the inner container 2 and the neck 3b of the outer container 3, which leads to the air vent A3. The gap C1 extends downward along the guide ribs 2d toward the shoulder. In this embodiment, the guide ribs 2d form the gap C1 between the inner container 2 and the outer container 3, thereby facilitating the introduction of air between the inner container 2 and the outer container 3 through the air vent A3 and efficiently guiding the air introduced through the air vent A3 downward toward the shoulder. However, the guide ribs 2d may also extend all the way to the mouth 2a of the inner container 2.

[0026] In addition, the inner circumferential surface F2 of the opening 2a of the inner container 2 is sealed by a seal portion S provided on the discharge cap 5.

[0027] In this embodiment, the discharge cap 5 includes an inner plug 6 provided with a flow hole A1 communicating with the inner container 2 together with a suck-back mechanism 7, a discharge valve 8 capable of opening and closing the flow hole A1 of the inner plug 6, a cap body 9 provided with a discharge hole A2 communicating with the flow hole A1 via the discharge valve 8 and attached to the mouth 3a of the outer container 3, and an outside air introduction valve 11 capable of opening and closing between an air vent A3 provided in the mouth 3a of the outer container 3 and an outside air introduction hole A5 provided in the cap body 9. The seal portion S provided in the discharge cap 5 is provided in the inner plug 6.

[0028] In this embodiment, the cap body 9 includes a mounting tube 9a, a partition wall 9b connected to the inner periphery of the upper end of the mounting tube 9a, and a discharge tube 9c provided in the partition wall 9b. In this embodiment, the discharge hole A2 is a through hole formed inside the discharge tube 9c.

[0029] In this embodiment, the attachment tube 9a of the cap body 9 includes an upper tubular portion 9a1 and a lower tubular portion 9a2. In this embodiment, an internal thread 9s is provided on the inner circumferential surface of the upper tubular portion 9a1. As shown in FIG. 1, in this embodiment, the internal thread 9s can be threaded onto an external thread 4s provided on the mouth portion 3a of the outer container 3. In addition, in this embodiment, as shown in FIG. 1, the inner circumferential surface of the lower tubular portion 9a2 tightly fits over the entire circumference with a bead ring 4c provided on the outer container 3, thereby sealing the entire circumference of the lower opening of the attachment tube 9a. That is, in this embodiment, the bead ring 4c functions as a sealing protrusion that tightly closes the gap C2 formed between the outer container 3 and the discharge cap 5 at the lower end of the gap C2.

[0030] Additionally, in this embodiment, an outside air introduction hole A5 is provided in the cap body 9. In this embodiment, the outside air introduction hole A5 is a through-hole formed in the partition wall 9b.

[0031] Reference numeral 12 denotes a lid that opens and closes the discharge hole A2 of the cap body 9. In this embodiment, the lid body 12 is an overcap that covers the upper part of the cap body 9. The lid body 12 includes a top wall 12a disposed above the partition wall 9b of the cap body 9 and a peripheral wall 12b extending downward from the radially outer edge of the top wall 12a. In addition, in this embodiment, as shown in FIG. 1, the lid body 12 includes a sealing protrusion 12c that tightly fits into the interior of the discharge tube 9c when the lid body 12 is placed over the cap body 9 to seal the discharge hole A2 of the discharge tube 9c. The sealing protrusion 12c extends downward from the top wall 12a. Furthermore, in this embodiment, as shown in FIG. 1, the lid body 12 includes a fitting tube 12d that releasably fits into the partition wall 9b when the lid body 12 is placed over the cap body 9. The fitting tube 12d also extends downward from the top wall 12a. In this embodiment, the lid body 12 is connected to the cap body 9 via a hinge 13. As a result, in this embodiment, the lid body 12 can be opened and closed relative to the cap body 9 via the hinge 13.

[0032] In this embodiment, the inside plug 6 also includes a partition wall 61 that is placed on the upper end of the mouth 4a of the container body 4. The partition wall 61 is placed on the upper end of the mouth 4a of the container body 4 to close the upper opening of the mouth 4a. Specifically, the partition wall 61 closes the upper opening of the mouth 2a of the inner container 2, which is formed radially inward of the flange 2c of the inner container 2. Additionally, in this embodiment, the partition wall 61 is provided with a cylindrical seal portion 62. In this embodiment, the cylindrical seal portion 62 extends downward from the partition wall 61. In this embodiment, the seal portion S is provided on the cylindrical seal portion 62. In this embodiment, the seal portion S is the outer peripheral surface of the cylindrical seal portion 62. The seal portion S tightly fits into the inner peripheral surface of the mouth 4a of the container body 4, thereby sealing the entire inner peripheral surface of the mouth 4a. Specifically, the seal portion S tightly fits onto the inner circumferential surface F2 of the mouth portion 2a of the inner container 2, thereby sealing the inner circumferential surface F2 of the mouth portion 2a of the inner container 2 over the entire circumference.

[0033] Furthermore, in this embodiment, the inside plug 6 is fixed to the inside of the cap body 9. In this embodiment, the radially outer edge of the partition wall 61 of the inside plug 6 is prevented from coming off by a retaining protrusion 9d provided on the inner circumferential surface of the upper cylindrical portion 9a1 of the mounting tube 9a of the cap body 9. Furthermore, in this embodiment, a cylindrical engagement wall 63 extending upward is integrally provided on the partition wall 61 of the inside plug 6. In this embodiment, the upper end of the engagement wall 63 contacts the lower surface of the partition wall 9b of the cap body 9, with the radially outer edge of the partition wall 61 being prevented from coming off by the retaining protrusion 9d of the cap body 9. As a result, in this embodiment, the inside plug 6 is fixed to the inside of the cap body 9.

[0034] Additionally, in this embodiment, the engagement wall 63 of the inside plug 6 is provided with an air hole A4 that is integrally formed with the partition wall 61. The air hole A4 connects the outside air introduction hole A5 with the gap C2. Furthermore, in this embodiment, the partition wall 61 of the inside plug 6 is provided with a circulation hole A1 that allows the content liquid in the container body 4 (inner container 2) to circulate to the outside. In this embodiment, the circulation hole A1 penetrates the partition wall 61 in the vertical direction.

[0035] In this embodiment, the discharge valve 8 is incorporated between the inside plug 6 and the cap body 9. The discharge valve 8 includes a valve body 8a, a fixed cylinder 8b, and a plurality of arms 8c. The arms 8c are arranged at intervals in the circumferential direction and connect the valve body 8a and the fixed cylinder 8b. The valve body 8a is formed in a plate shape (disk shape). The valve body 8a is arranged on the upper surface of the partition wall 61. In an initial state, the valve body 8a closes the flow hole A1.

[0036] In this embodiment, the lower end of the fixed barrel 8b is tightly fitted into a fitting groove 6g formed in the partition wall 61 of the inside plug 6. Also, in this embodiment, the upper end of the fixed barrel 8b is tightly fitted into a fitting groove 9g formed in the partition wall 9b of the cap body 9. As a result, in this embodiment, the portion between the partition wall 61 of the inside plug 6 and the partition wall 9b of the cap body 9 that is radially inward of the fixed barrel 8b is defined as a flow path for the content liquid. On the other hand, in this embodiment, the portion between the partition wall 61 of the inside plug 6 and the partition wall 9b of the cap body 9 that is radially outward of the fixed barrel 8b is defined as a flow path for the outside air (gas).

[0037] The valve element 8a of the discharge valve 8 is supported by the fixed cylinder 8b via a plurality of arms 8c in an elastically deformable manner. This allows the valve element 8a to move in the vertical direction (towards or away from) relative to the upper surface of the partition wall 61 of the inside plug 6. Specifically, the valve element 8a opens and closes the flow hole A1 so as to allow the content liquid to flow out from the flow hole A1 toward the discharge hole A2, while preventing the content liquid from flowing in from the discharge hole A2 toward the flow hole A1.

[0038] Furthermore, in this embodiment, the inside plug 6 is equipped with a suck-back mechanism 7 for preventing liquid from dripping outward from the discharge hole A2. The suck-back mechanism 7 is disposed radially forward of the axis O and farther from the hinge 13. In addition, in this embodiment, the flow hole A1 is disposed radially rearward, closer to the hinge 13 than the axis O. In this embodiment, the suck-back mechanism 7 includes a cylindrical wall 7a extending downward from the partition wall 61, and a valve body 7b. In this embodiment, the lower end of the cylindrical wall 7a tapers downward so that the inner diameter decreases. In addition, in this embodiment, the valve body 7b is formed in a spherical (ball) shape from, for example, steel or resin. The valve body 7b is disposed within the cylindrical wall 7a so as to be movable up and down.

[0039] In this embodiment, when the container body 4 is tilted so that the discharge hole A2 faces downward, the valve element 7b moves toward the discharge hole A2 within the cylindrical wall 7a, as shown by the dashed line in FIG. 1 . Then, when the container body 4 is returned to its upright position after the liquid content is discharged so that the discharge hole A2 faces upward, the valve element 7b moves toward the lower end of the cylindrical wall 7a within the cylindrical wall 7a. As a result, the liquid content remaining within the discharge hole A2 is sucked into the radially inner space surrounded by the fixed tube 8b within the space between the partition wall 61 of the inside plug 6 and the partition wall 9b of the cap body 9 until the valve element 7b moves to a position where it abuts the lower end (reduced diameter portion) of the cylindrical wall 7a, as shown in FIG. 1 . Therefore, the suck-back mechanism 7 reduces the amount of content remaining within the discharge hole A2, preventing dripping from the discharge hole A2.

[0040] Additionally, in this embodiment, an outside air introduction valve 11 that opens and closes the outside air introduction hole A5 is integrally provided on the outer peripheral surface of the fixed cylinder 8b of the discharge valve 8.

[0041] The outside air introduction valve 11 includes an annular membrane 11a that protrudes radially outward from the fixed barrel 8b and extends annularly in the circumferential direction, and an annular valve body 11b that forms the radially outer edge of the annular membrane 11a. In this embodiment, as shown in FIG. 1 , the annular valve body 11b initially closes the outside air introduction valve 11 by tightly contacting the lower surface of the partition wall 9b. In this embodiment, the annular valve body 11b is elastically supported on the fixed barrel 8b via the annular membrane 11a. The annular valve body 11b can be moved vertically (toward or away from) the lower surface of the partition wall 9b of the cap body 9. This allows the outside air introduction into the discharge cap 5 through the outside air introduction hole A5 while preventing air from escaping from the inside of the discharge cap 5 to the outside through the outside air introduction hole A5. In this embodiment, the outside air introduction valve 11 is an elastic member integrally formed with the discharge valve 8.

[0042] However, the discharge valve 8 and the outside air introduction valve 11 may be configured as separate members.

[0043] According to the discharge container 1, when the container body 4 is squeezed, the liquid contained in the container body 4 (inner container 2) is discharged from the flow hole A1 to the outside through the discharge hole A2 by the discharge valve 8 being opened by an increase in the internal pressure of the container body 4 (inner container 2). At this time, the air between the container body 4 and the discharge cap 5 is held between the container body 4 and the discharge cap 5 by the seal between the bead ring 4c of the container body 4 and the mounting tube 9a of the cap body 9, and the seal between the partition wall 9b of the cap body 9 and the outside air introduction valve 11. As a result, the liquid contained in the container body 4 can be easily pushed out of the inner container 2 by the inner container 2 being separated from the outer container 3 and undergoing volume reduction deformation due to the air drawn into the gap C1 through the air vent A3.

[0044] On the other hand, when the squeeze of the container body 4 is released, the liquid content of the container body 4 (inner container 2) is not discharged to the outside through the flow hole A1 and the discharge hole A2 because the discharge valve 8 is closed due to a decrease in the internal pressure of the container body 4 (inner container 2). The liquid content remaining inside the discharge cap 5 is also returned to the container body 4 (inner container 2) by the suck-back mechanism 7. At this time, the outside air introduction valve 11 inside the discharge cap 5 is opened by the negative pressure generated below the outside air introduction valve 11 (on the air hole A4 side). This allows outside air from the discharge cap 5 to be introduced into the discharge cap 5 through the outside air introduction hole A5. The air introduced through the outside air introduction hole A5 passes through the air hole A4, gap C2, and ventilation A3 before being drawn into the gap C1 between the inner container 2 and the outer container 3. As a result, even after the squeeze of the container body 4 is released, the outer container 3 can be restored to its original shape while the inner container 2 remains deformed.

[0045] FIG. 2 shows an enlarged view of the area X in FIG.

[0046] The sealing portion S is arranged to seal the inner surface F2 of the mouth 2a of the inner container 2 at a position lower than the upper end 3e of the mouth 3a of the outer container 3, and it is preferable that the position of the upper end e1 of the sealing portion S is the same as the position of the upper end 3e of the mouth 3a of the outer container 3 or lower than the position of the upper end 3e of the outer container 3.

[0047] In FIG. 2, the symbol Dc denotes the flange thickness. In this embodiment, the flange thickness Dc is the axial thickness (length) of the flange 2c. In this embodiment, the flange thickness Dc is the axial thickness (length) between the upper end 2e1 of the flange 2c (which in this embodiment is the same as the upper end of the mouth 2a of the inner container 2) and the lower end 2e2 of the flange 2c. A specific example of the flange thickness Dc is 1.8 mm. If the flange thickness Dc is too thin, it may fall off from the mouth 3a of the outer container 3 during, for example, blow molding of the container body 4 or capping when attaching the discharge cap 5. Therefore, the flange thickness Dc needs to be, for example, 1.0 mm or more.

[0048] Reference symbol L2 denotes the protruding length of the inner container 2 protruding from the upper end 3e of the outer container 3. Specifically, the protruding length L2 is the length in the axial direction between the upper end 2e1 of the flange 2c and the upper end 3e of the outer container 3. In this embodiment, the protruding length L2 is equal to the flange thickness Dc. However, the protruding length L2 may be longer than the flange thickness Dc.

[0049] The symbol Ls denotes the seal length. In this embodiment, the seal length Ls is the axial length of the seal portion S. Specifically, the seal length Ls is the length in the axial direction between the upper end e1 of the seal portion S and the lower end e2 of the seal portion S. A specific example of the seal length Ls is 1.5 mm. The seal length Ls can be set appropriately based on the condition of the inner surface (inner circumferential surface F2) of the mouth portion 2a of the inner container 2. In this embodiment, the position of the upper end e1 of the seal portion S is lower than the position of the upper end 3e of the outer container 3. However, the position of the upper end e1 of the seal portion S may also be the same as the position of the upper end 3e of the mouth portion 3a of the outer container 3.

[0050] As described above, in this embodiment, the mouth 2a of the inner container 2 is provided with a flange 2c that protrudes radially outward from the outer peripheral surface of the mouth 2a in order to hook onto the upper end 3e of the mouth 3a of the outer container 3.

[0051] However, when the inner container 2 is molded using an injection-molded preform, sink marks may occur on the inner circumferential surface of the flange 2c provided at the mouth 2a of the inner container 2. If sink marks occur on the inner circumferential surface of the flange 2c, distortion or a dent will be formed on the inner circumferential surface of the flange 2c, i.e., the inner circumferential surface F2 of the mouth 2a of the inner container 2. In this case, even when the mouth 2a of the inner container 2 is sealed with the cylindrical sealing portion of the discharge cap 5, the seal may not function properly. Therefore, conventional discharge containers have room for improvement in the sealing performance between the inner container and the discharge cap.

[0052] In contrast, according to the dispensing container 1, as shown in Fig. 2, the seal portion S seals the inner circumferential surface F2 of the mouth 2a of the inner container 2 at a position lower than the flange 2c provided on the mouth 2a of the inner container 2 and lower than the upper end 3e of the outer container 3. Furthermore, in this embodiment, the upper end e1 of the seal portion S is located lower than the upper end 3e of the outer container 3. That is, the seal portion S according to this embodiment seals the inner circumferential surface F2 of the mouth 2a of the inner container 2, excluding the flange 2c where sink marks may occur. Therefore, according to the dispensing container 1, the sealing performance between the inner container 2 and the dispensing cap 5 is improved.

[0053] Furthermore, in the discharge container 1, the flange 2c provided on the mouth 2a of the inner container 2 is hooked onto the upper end 3e of the mouth 3a of the outer container 3. For this reason, the mouth 3a of the outer container 3 in the discharge container 1 needs to have a certain radial thickness. In addition, since deformation may occur in the mouth 3a of the outer container 3 when it is blow molded together with the inner container 2, the radial thickness of the mouth 3a of the outer container 3 cannot be made thin.

[0054] According to the discharge container 1, the seal portion S is fitted tightly in the radial direction to the inner circumferential surface F2 of the mouth 2a of the inner container 2, thereby pressing the mouth 2a of the inner container 2 toward the inner circumferential surface F3 of the mouth 3a of the outer container 3. Meanwhile, as described above, the mouth 3a of the outer container 3 has a constant radial thickness, thereby ensuring high rigidity and strength. Therefore, the discharge container 1 can improve the deterioration of sealing performance caused by sink marks that may occur in the flange 2c, and can efficiently seal the inner circumferential surface F2 of the mouth 2a of the inner container 2.

[0055] In addition, the inner circumferential surface F2 of the mouth 2a of the inner container 2, where the flange 2c is located, is preferably a tapered surface 2t that slopes radially inward as it extends downward. However, as described above, in this embodiment, the protrusion length L2 is equal to the flange thickness Dc. Therefore, as shown in Fig. 2, in this embodiment, the inner circumferential surface F2 of the mouth 2a of the inner container 2, between the upper end 2e1 of the mouth 2a of the inner container 2 and the upper end e1 of the seal S provided on the discharge cap 5, is a tapered surface 2t that slopes radially inward as it extends downward.

[0056] In this embodiment, when the inner circumferential surface F2 of the mouth 2a of the inner container 2, where the flange 2c is located, is formed by a tapered surface 2t, it is possible to prevent sink marks from occurring on the inner circumferential surface of the flange 2c. This reduces the likelihood of sink marks occurring on the inner circumferential surface F2 where the flange 2c is located, thereby reducing the impact of sink marks on the seal portion S adjacent to the flange 2c. This further improves the sealing performance between the inner container 2 and the discharge cap 5.

[0057] 2, in this embodiment, the tapered surface 2t is inclined in a region radially inward from the inner circumferential surface F3 of the mouth 3a of the outer container 3. In this case, the flange 2c provided on the mouth 2a of the inner container 2 for hooking onto the upper end 3e of the mouth 3a of the outer container 3 can be prevented from generating sink marks on the inner circumferential surface F2 where the flange 2c is located, without impairing the function of the flange 2c.

[0058] In FIG. 2, the mouth thickness W2 is the radial thickness (width) between the inner circumferential surface F2 of the mouth 2 of the inner container 2 and the outer circumferential surface of the mouth 2 of the inner container 2 (which coincides with the inner circumferential surface F3 of the mouth 3a of the outer container 3 in FIG. 2), excluding the flange thickness Wc (described later). Also, the symbol Dt denotes the taper depth. In this embodiment, the taper depth Dt is the radial depth (width) between the inner circumferential surface F2 of the mouth 2a of the inner container 2 and the upper end of the tapered surface 2t, which is the maximum radial depth of the tapered surface 2t, with the inner circumferential surface F2 of the mouth 2a of the inner container 2 as the base point. A specific example of the taper depth Dt is 0.4 mm. The maximum value of the taper depth Dt may be equal to the mouth thickness W2 (Dt = W2). The minimum value of the taper depth Dt may be, for example, 0.2 mm.

[0059] Furthermore, the symbol Da denotes the thickness of the remaining mouth portion of the inner container 2. The remaining mouth portion thickness Da is the thickness (width) of the remainder of the mouth portion thickness W2, obtained by subtracting the taper depth Dt from the mouth portion thickness W2 of the inner container 2. In this embodiment, the remaining mouth portion thickness Da is the thickness (width) in the radial direction between the upper end of the tapered surface 2t and the outer peripheral surface of the mouth portion 2a of the inner container 2 (excluding the flange portion 2c). A specific example of the remaining mouth portion thickness Da is 1.1 mm.

[0060] Furthermore, the symbol Wc denotes the flange width. The flange width Wc is the radial width (thickness) between the outer peripheral surface of the mouth 2a of the inner container 2 (excluding the flange 2c) and the radially outer edge of the flange 2c. A specific example of the flange width Wc is 0.8 mm. As long as the flange width Wc is 0.5 mm or more, it should not extend beyond the outer surface (outer peripheral surface) of the mouth 3a of the outer container 3.

[0061] The above-described exemplary embodiments of the present invention are merely illustrative, and the present invention is not limited to the above-described embodiments, but may be modified in various ways within the scope of the appended claims. [Explanation of symbols]

[0062] 1: Discharge container, 2: Inner container, 2a: Mouth, 2b: Neck, 2c: Flange, 2e1: Upper end of mouth 2a of inner container 2 (upper end of flange), 2e2: Lower end of flange, 2t: Tapered surface, 3: Outer container, 3a: Mouth, 3b: Neck, 3e: Upper end of mouth of outer container, 4: Container body, 4a: Mouth, 4b: Neck, 4c: Bead ring, 4d: Neck ring, 4s: Male thread, 5: Discharge cap, 6: Inner plug, 6g: Fitting groove, 7: Suck-back mechanism, 7a: Cylindrical wall, 7b: Valve, 8: Discharge valve, 8a: Valve, 8b: Fixed tube, 8c: Arm, 9: Cap body, 9a: Mounting tube, 9a1: Upper tube part, 9a2: lower cylinder part, 9b: partition wall, 9c: discharge cylinder, 9d: retaining protrusion, 9g: fitting groove, 9s: internal thread, 11: outside air introduction valve, 12: lid body, 12a: top wall, 12b: peripheral wall, 12c: sealing protrusion, 12d: fitting cylinder, 13: hinge, 61: partition wall, 62: sealing cylinder part, 63: engagement wall, A1: circulation hole, A2: discharge hole, A3: ventilation hole, A4: air hole, A5: outside air introduction hole, Da: remaining thickness of mouth part of inner container, Dc: flange thickness, Dt: taper depth, L2: protruding length of inner container, Ls: seal length, W2: mouth thickness of inner container, Wc: flange width, S: seal part

Claims

1. A discharge container comprising: a container body in which an inner container capable of containing a liquid content is placed inside an outer container; and a discharge cap attached to a mouth portion of the container body, wherein the container body is a stretch-blow molded container formed by stretch-blowing an injection-molded preform for the inner container and an injection-molded preform for the outer container that are stacked inside and outside, the mouth portion of the container body being formed by placing a flange portion provided on the mouth portion of the inner container on an upper end of the mouth portion of the outer container, and the inner circumferential surface of the mouth portion of the inner container being sealed by a seal portion provided on the discharge cap, A dispensing container, wherein the sealing portion is arranged to seal the inner surface of the mouth of the inner container at a position lower than the upper end of the mouth of the outer container, and the position of the upper end of the sealing portion is the same as or lower than the upper end of the mouth of the outer container.

2. 2. The discharge container according to claim 1, wherein the inner circumferential surface of the mouth of the inner container, where the flange is located, is a tapered surface that slopes radially inward as it extends downward.

3. The discharge container according to claim 2 , wherein the tapered surface is inclined in a region radially inward from an inner circumferential surface of the mouth of the outer container.

4. The discharge cap includes an inner plug having a flow hole communicating with the inner container and a suck-back mechanism, a discharge valve capable of opening and closing the flow hole of the inner plug, a cap body having a discharge hole communicating with the flow hole via the discharge valve and attached to the mouth of the outer container, and an outside air introduction valve capable of opening and closing between an air vent provided in the mouth of the outer container and an outside air introduction hole provided in the cap body, The discharge container according to any one of claims 1 to 3, wherein the seal portion is provided on the inside plug.

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