Delaminated bottle

Abstract

To prevent a lower surface of a flange from peeling off from an upper end opening edge of a mouth of an outer container.SOLUTION: A top surface portion 17, a hanging surface portion 18, and a biting recess 21 are formed. The top surface portion 17 has a configuration in which an inner container 12 is peelably laminated on the inner surface of an outer container 11, a flange 14 protruding radially outwardly and extending circumferentially is formed on the upper end of a mouth of the inner container, and a lower surface of the flange is located at an upper end opening edge 15 of the mouth of the outer container. The top surface portion 17 is located on the flange, and on the upper end opening edge of the mouth of the outer container, at the inner end portion of the radial direction and facing upward. The hanging surface portion 18 extends downwardly on the outer radial end portion in the top surface portion. The biting recess 21 is provided with a lower surface portion 19, which extends from the lower end of the hanging surface portion to the outside in the radial direction and faces upward. The biting recess 21 is located on at least one of the upper and lower surface portions on the upper end opening edge of the mouth of the outer container, and is open upward and is bitten by a portion 14a of the flange.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a laminated peeling bottle.

Background Art

[0002] Conventionally, there is known a laminated peeling bottle including an outer container, a flexible inner container that contains contents and contracts and deforms as the contents decrease, the inner container being laminated on the inner surface of the outer container so as to be peelable, and a flange portion that protrudes radially outward and extends in the circumferential direction being formed at the upper end portion of the mouth of the inner container, the lower surface of the flange portion being disposed at the upper end opening edge of the mouth of the outer container.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional laminated peeling bottle, there is room for improvement in suppressing the lower surface of the flange portion from peeling from the upper end opening edge of the mouth of the outer container. Such peeling may occur, for example, when outside air flows into the space between the inner surface of the outer container and the outer surface of the inner container through the outside air introduction hole, and when peeling off a sealing seal attached to the upper end opening edge of the mouth in the laminated peeling bottle. Among these, as the former case, for example, after blow molding and before filling the inner container with contents, only the inner container is shrink-deformed to force the outer surface of the inner container to be separated from the inner surface of the outer container, and then the inner container is restored and deformed again, and also when a part of the outside air introduction hole is blocked for some reason.

[0005] Therefore, an object of the present invention is to provide a laminated peeling bottle capable of suppressing the lower surface of the flange portion from peeling from the upper end opening edge of the mouth of the outer container. [Means for solving the problem]

[0006] A laminated peelable bottle according to one aspect of the present invention comprises an outer container and a highly flexible inner container that contains contents and deforms in volume as the contents decrease, wherein the inner container is peelably laminated on the inner surface of the outer container, a flange portion is formed at the upper end of the mouth of the inner container, projecting radially outward and extending circumferentially, the lower surface of the flange portion is positioned at the upper opening edge of the mouth of the outer container, and the flange portion and the upper opening edge of the mouth of the outer container are provided with an upper surface portion located at the radially inward end and facing upward, a hanging lower surface portion extending downward from the radially outward end of the upper surface portion, and a lower surface portion extending radially outward from the lower end of the hanging lower surface portion and facing upward, and at least one of the upper surface portion and the lower surface portion is located at the upper opening edge of the mouth of the outer container, a recess is formed that opens upward and into which a part of the flange portion is embedded.

[0007] The flange portion and the upper opening edge of the mouth of the outer container are provided with an upper surface portion, a hanging lower surface portion, and a lower surface portion. At the upper opening edge of the mouth of the outer container, a recess is formed in which a part of the flange portion is embedded, located at least one of the upper surface portion and the lower surface portion. Therefore, compared to, for example, a configuration in which only an upper surface portion is provided on the flange portion and the upper opening edge of the mouth of the outer container, the adhesion strength between the flange portion and the upper opening edge of the mouth of the outer container can be increased, and even if a force is applied to the flange portion to pull it away from the upper opening edge of the mouth of the outer container, this force is less likely to be transmitted radially. As a result, the lower surface of the flange portion can be prevented from peeling off from the upper opening edge of the mouth of the outer container. Since the recessed portion faces upward and is formed in at least one of the upper and lower surfaces of the outer container's opening edge, both of which face upward, it is possible to obtain a laminated peel-off bottle that achieves the aforementioned effects while preventing complexity of the mold structure.

[0008] The recessed portion may be formed on the upper opening edge of the mouth of the outer container, in the portion located on the lower surface.

[0009] Since the recessed portion is formed on the lower surface of the upper opening edge of the mouth of the outer container, for example, when the cap is tightly pressed against the upper surface to seal the upper opening of the laminated peel-off bottle, the inside of the laminated peel-off bottle can be easily sealed, and when the sealing seal that closes the upper opening of the laminated peel-off bottle is peelably attached to the upper surface, the adhesive area of ​​the sealing seal can be secured.

[0010] Of the inner surfaces of the recessed portion, the inner circumferential surface located at the radially inner end and facing radially outward may be seamlessly connected to the portion located at the upper opening edge of the mouth of the outer container, where the portion is located on the downward-facing surface.

[0011] Since the inner circumferential surface of the recessed portion is seamlessly connected to the portion located on the downward-sloping surface of the upper opening edge of the outer container's mouth, it becomes possible to ensure a longer vertical extension portion of the flange portion and the upper opening edge of the outer container's mouth. This reliably suppresses the transmission of the aforementioned peeling force applied to the flange portion in the radial direction, and makes it difficult for gaps to form between the flange portion and the upper opening edge of the outer container's mouth. This reliably increases the adhesion strength between the flange portion and the upper opening edge of the outer container's mouth. [Effects of the Invention]

[0012] According to this invention, it is possible to prevent the lower surface of the flange from peeling off from the upper opening edge of the mouth of the outer container. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view of the mouth of a laminated peel-off bottle, as shown in one embodiment. [Figure 2] This is a top view of Figure 1. [Figure 3] This is a cross-sectional view taken along the line III-III in Figure 2. [Figure 4] This is an explanatory diagram of a method for manufacturing a laminated peel-off bottle, as shown as one embodiment. [Figure 5] This is a side view of a laminated peel-off bottle shown as one embodiment. [Modes for carrying out the invention]

[0014] A laminated peel-off bottle according to one embodiment will be described below with reference to the drawings. As shown in Figures 1 to 3, the laminated peel-off bottle 1 according to this embodiment comprises an outer container 11 and a highly flexible inner container 12 that holds contents and deforms to reduce in volume as the contents decrease, with the inner container 12 being laminated to the inner surface of the outer container 11 in a peel-off manner. The inner container 12 is housed inside the outer container 11. An outside air inlet 16 is formed at the mouth of the outer container 11, allowing outside air to be introduced between it and the inner container 12. The shape of the outside air inlet 16 in plan view may be circular, angular, or slit-shaped, and the position of the outside air inlet 16 may be on the body or bottom of the outer container 11.

[0015] The outer container 11 and the inner container 12 are made of synthetic resin material, and may be made of the same material or different materials. Examples of synthetic resin materials include PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), nylon (polyamide), and EVOH (ethylene-vinyl alcohol copolymer).

[0016] As shown in Figure 5, the laminated peeling bottle 1 comprises at least a mouth portion 13, a body portion 1a, and a bottom portion 1b. The mouth portion 13, body portion 1a, and bottom portion 1b are arranged in this order coaxially with a common axis. Hereinafter, this common axis will be referred to as the bottle axis O, the side of the laminated peel-off bottle 1 with the mouth portion 13 along the bottle axis O will be referred to as the upper side, and the side of the laminated peel-off bottle 1 with the bottom portion 1b will be referred to as the lower side. When viewed from the direction of the bottle axis O (up and down direction), the direction intersecting the bottle axis O will be referred to as the radial direction, and the direction that circles around the bottle axis O will be referred to as the circumferential direction.

[0017] The mouth part 13 of the laminated peelable bottle 1 is formed by laminating the mouth part of the outer container 11 and the mouth part of the inner container 12. The body part 1a of the laminated peelable bottle 1 is formed by laminating the body part of the outer container 11 and the body part of the inner container 12. The bottom part 1b of the laminated peelable bottle 1 is formed by laminating the bottom part of the outer container 11 and the bottom part of the inner container 12.

[0018] At least the body part of the outer container 11 is formed to be elastically deformable in the radial direction. A circumferential groove 11a that continuously extends over the entire circumferential length is formed at the upper end of the outer peripheral surface of the mouth part of the outer container 11. The circumferential groove 11a opens integrally outward and upward in the radial direction. As shown in FIG. 3, among the inner surfaces of the circumferential groove 11a, the upper end edge of the bottom surface located at the inner end in the radial direction and facing outward in the radial direction is continuous with the outer end edge in the radial direction at the upper end opening edge 15 of the mouth part of the outer container 11.

[0019] A flange part 14 that protrudes outward in the radial direction and extends in the circumferential direction is formed at the upper end of the mouth part of the inner container 12. The flange part 14 is formed by bending the upper end part of the inner container 12 outward in the radial direction. The flange part 14 continuously extends over the entire circumferential length. The lower surface of the flange part 14 is disposed at the upper end opening edge 15 of the mouth part of the outer container 11.

[0020] The upper end opening edge 13a of the mouth part 13 of the laminated peelable bottle 1 is constituted by the flange part 14 and the upper end opening edge 15 of the mouth part of the outer container 11.

[0021] The upper end part 13b of the inner peripheral surface of the mouth part 13 of the laminated peelable bottle 1 is constituted by a part that extends downward from the inner end in the radial direction of the flange part 14 of the inner container 12 and the upper end part of the inner peripheral surface of the mouth part of the outer container 11. A seal cylinder of a cap (not shown) is fitted to the upper end part 13b of the inner peripheral surface of the mouth part 13. Among the inner peripheral surface of the mouth part 13, the upper end part 13b is located most inward in the radial direction.

[0022] An upper surface portion 17, a hanging lower surface portion 18, and a lower surface portion 19 are provided on the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11.

[0023] The upper portion 17 is provided at the radial inner end of the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11. The upper portion 17 faces upward. The upper portion 17 preferably extends in a direction perpendicular to the bottle axis O. The lower surface of the sealing seal S is peelably bonded (welded) to the upper surface of the upper portion 17. However, it is not necessary to provide the sealing seal S on the upper surface of the upper portion 17. On the upper surface portion 17, the flange portion 14 faces in the direction of the bottle axis O, and the upper end opening edge 15 of the mouth of the outer container 11 faces upward. The lower surface of the sealing seal S is peelably adhered to the upper surface of the flange portion 14 of the upper surface portion 17. The sealing seal S is not adhered to the hanging lower surface portion 18 and the lower surface portion 19.

[0024] The hanging surface portion 18 extends downward from the radial outer end of the upper surface portion 17. The hanging surface portion 18 faces radially outward. The hanging portion 18 preferably extends straight in the direction of the bottle axis O. The size of the hanging portion 18 in the direction of the bottle axis O is equal to the radial width of the upper portion 17. However, the size of the hanging portion 18 in the direction of the bottle axis O may be different from the radial width of the upper portion 17. In the hanging surface portion 18, the flange portion 14 faces radially, and the upper opening edge 15 of the mouth of the outer container 11 faces radially outward.

[0025] The lower surface portion 19 extends radially outward from the lower end of the hanging lower surface portion 18. The lower surface portion 19 faces upward. The lower portion 19 preferably extends in a direction perpendicular to the bottle axis O. The radial width of the lower portion 19 is equal to the radial width of the upper portion 17 and the size of the hanging lower portion 18 in the direction of the bottle axis O. However, the radial width of the lower portion 19 may be different from the radial width of the upper portion 17 and the size of the hanging lower portion 18 in the direction of the bottle axis O. The distance between the upper surface of the lower portion 19 and the upper surface of the upper portion 17 in the direction of the bottle axis O is equal to the radial width of the lower portion 19. However, the distance between the upper surface of the lower portion 19 and the upper surface of the upper portion 17 in the direction of the bottle axis O may be different from the radial width of the lower portion 19. In the lower portion 19, the flange portion 14 faces in the direction of the bottle axis O, and the upper opening edge 15 of the mouth of the outer container 11 faces upward.

[0026] At the upper opening edge 15 of the mouth of the outer container 11, a recessed area 21 is formed in the portion located at least one of the upper surface portion 17 and the lower surface portion 19, which opens upward and into which a part 14a of the flange portion 14 is embedded. In the illustrated example, the recessed portion 21 is formed on the upper opening edge 15 of the mouth of the outer container 11, in the portion located on the lower surface 19. The recessed portion 21 may also be formed on the upper surface 17 of the upper opening edge 15 of the mouth of the outer container 11, or it may be formed on both the upper surface 17 and the lower surface 19.

[0027] The recessed portion 21 opens straight upward. The recessed portion 21 may also open in a direction that is slightly inclined with respect to the bottle axis O. The bottom surface 21a of the recessed portion 21 is formed as a concave curved surface that is recessed downward. Of the inner surface of the recessed portion 21, the inner circumferential surface 21b located at the inner end in the radial direction and facing outward in the radial direction is seamlessly connected in the direction of the bottle axis O to the portion located at the hanging surface 18 of the upper opening edge 15 of the mouth of the outer container 11.

[0028] A portion 14a of the flange portion 14 is embedded in the recessed portion 21 over its entire thickness. The upper surface of the portion 14a of the flange portion 14 is located below the opening of the recessed portion 21 at the upper end opening edge 15 of the mouth of the outer container 11.

[0029] As shown in Figure 2, the recessed areas 21 are formed in a circumferentially extending strip-like shape. The lower surface of a portion 14a of the flange portion 14 abuts against the inner surface of the recessed area 21 over its entire surface. Multiple recessed areas 21 are provided at intervals in the circumferential direction. The multiple recessed areas 21 are provided at equal intervals in the circumferential direction. The distance between adjacent recessed areas 21 in the circumferential direction is smaller than the circumferential size of the recessed area 21. Furthermore, the recessed portion 21 may be provided continuously along the entire length of the upper opening edge 15 of the mouth of the outer container 11 in the circumferential direction, and the spacing between adjacent recessed portions 21 in the circumferential direction may be greater than or equal to the circumferential size of the recessed portion 21.

[0030] Next, the manufacturing method of the laminated peel-off bottle 1, configured as described above, will be explained with reference to Figure 4.

[0031] First, a parison P, formed by heating and melting a synthetic resin material and extruding it into a tube, is sandwiched between a pair of split molds 51 from the radial outside. Compressed air is then supplied to the inside of the parison P to expand it. At this time, the entire laminated release bottle 1 is formed, except for the upper opening edge 13a of the mouth portion 13 and the upper end portion 13b of the inner circumferential surface of the mouth portion 13.

[0032] At this time, the plug 52 is pushed into the parison P from above (extruder side), and the upper surface portion 17, the hanging lower surface portion 18, and the lower surface portion 19, that is, the upper opening edge 13a of the mouth portion 13, and the upper end portion 13b of the inner circumferential surface of the mouth portion 13, are formed together with the recessed portion 21. The plug 52 is formed in an annular shape and abuts against the parison P along its entire length in the circumferential direction. Furthermore, in this process, the connection portion of the parison P between the bottom surface of the circumferential groove 11a formed at the upper end of the outer peripheral surface of the mouth of the outer container 11 and the upper opening edge 13a of the mouth 13 is sandwiched and cut by the split mold 51 and the plug 52, and the portion P1 located above this connection portion is removed.

[0033] As described above, according to the laminated peel-off bottle 1 of this embodiment, an upper surface portion 17, a hanging lower surface portion 18, and a lower surface portion 19 are provided on the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11, and a recessed portion 21 is formed in which a part 14a of the flange portion 14 is embedded in the upper opening edge 15 of the mouth of the outer container 11, in a portion located at least one of the upper surface portion 17 and the lower surface portion 19. Therefore, compared to a configuration in which only an upper surface portion 17 is provided on the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11, for example, the adhesion strength between the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11 can be increased, and even if a force is applied to the flange portion 14 to pull it away from the upper opening edge 15 of the mouth of the outer container 11, this force is less likely to be transmitted radially. As a result, the lower surface of the flange portion 14 can be prevented from peeling off from the upper opening edge 15 of the mouth of the outer container 11.

[0034] Since the recessed portion 21 faces upward and is formed on at least one of the upper surface portion 17 and the lower surface portion 19, both of which face upward, at the upper opening edge 15 of the mouth of the outer container 11, it is possible to obtain a laminated peel-off bottle 1 that achieves the aforementioned effects while preventing complexity of the mold structure.

[0035] Since the recessed portion 21 is formed on the upper opening edge 15 of the mouth of the outer container 11, at the portion located on the lower surface 19, for example, when the cap is brought into close contact with the upper surface 17 to seal the upper opening of the laminated peel-off bottle 1, the inside of the laminated peel-off bottle 1 can be easily sealed, and when the sealing seal S that closes the upper opening of the laminated peel-off bottle 1 is peelably attached to the upper surface 17, the adhesive area of ​​the sealing seal S can be secured.

[0036] Since the inner circumferential surface 21b of the recessed portion 21 is seamlessly connected to the portion located at the downward-sloping surface portion 18 of the upper opening edge 15 of the mouth of the outer container 11, it becomes possible to ensure a longer portion of the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11 that extends in the direction of the bottle axis O. This reliably suppresses the propagation of the aforementioned peeling force applied to the flange portion 14 in the radial direction, and makes it difficult for gaps to form between the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11. This reliably increases the adhesion strength between the flange portion 14 and the upper opening edge 15 of the mouth of the outer container 11.

[0037] Since the lower portion 19 is located below the upper portion 17 to which the sealing seal S is adhered, and the sealing seal S is not adhered to the lower portion 19 which has the outer peripheral edge of the flange portion 14, it is possible to prevent the lower surface of the flange portion 14 from peeling off from the upper opening edge 15 of the mouth of the outer container 11 when peeling off the sealing seal S from the upper opening edge 15 of the mouth of the outer container 11.

[0038] Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0039] For example, the inner circumferential surface 21b of the recessed portion 21 may be radially outward from the portion located on the hanging surface portion 18 at the upper opening edge 15 of the mouth of the outer container 11. The upper surface portion 17 may be slightly inclined with respect to the direction perpendicular to the bottle axis O. The hanging surface portion 18 may be slightly inclined with respect to the bottle axis O direction. The lower surface portion 19 may be slightly inclined with respect to the direction perpendicular to the bottle axis O.

[0040] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above embodiments and modifications may be combined as appropriate. [Explanation of symbols]

[0041] 1. Laminated peel bottle 11 Outer container 12 Inner container 14 Flange section 14a Part 15 Upper end opening edge 17 Top part 18 Drooping surface part 19 Bottom part 21 Indentation recess 21b Inner surface

Claims

1. The container comprises an outer container and a flexible inner container that accommodates contents and deforms to reduce its volume as the contents decrease, the inner container being peelably stacked on the inner surface of the outer container; A flange portion is formed at an upper end of a mouth portion of the inner container, protruding radially outward and extending circumferentially, a lower surface of the flange portion disposed on an upper opening edge of a mouth portion of the outer container; The flange portion and the upper opening edge of the mouth portion of the outer container are provided with an upper surface portion located at an inner end portion in the radial direction and facing upward; a hanging surface portion extending downward from a radially outer end portion of the upper surface portion; a lower surface portion extending radially outward from a lower end of the hanging surface portion and facing upward; A laminated peelable bottle in which a recess that opens upward and is embedded into a portion of the flange portion is formed in a portion of the upper opening edge of the mouth of the outer container, located on at least one of the upper surface portion and the lower surface portion.

2. The delaminating bottle according to claim 1 , wherein the biting recess is formed in a portion of the upper opening edge of the mouth of the outer container that is located on the lower surface portion.

3. 3. The laminated delaminating bottle according to claim 2, wherein the inner peripheral surface of the engaging recess, which is located at the radially inner end and faces radially outward, is seamlessly connected to the portion located at the hanging surface portion at the upper opening edge of the mouth of the outer container.

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