Carton spout

Abstract

To provide the spout for a carton having an overrun-proof upper lid and improved in sealability and opening / closing operability.SOLUTION: The spout for a carton has bridge breaking means between an inner plug stem 5 and a TE band 29, and an overrun preventive structure between the inner plug stem 5 and an upper lid 3. The overrun preventive structure is formed of a first upper lid hooking part 3c provided on an opening edge end face of the upper lid 3 and a TE band falling preventive part 8. When the upper lid plug is closed, the first upper lid hooking part 3c abuts on an end face 8a around an inner plug axial center of the TE band falling preventive part 8 around an upper lid axial center, and the TE band falling preventive part 8 receives the upper lid at a part around the upper lid axial center.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carton spout that is provided in a carton made of a material such as paper. [Background technology]

[0002] Conventional carton spouts include, for example, the one described in Patent Document 1. This is a plastic resin spout that is attached to a paper container for liquids and consists of a spout and a cap. The resin that makes up the spout is primarily composed of polyethylene resin and contains 5% by weight or more of biomass polyethylene resin.

[0003] The spout has an external thread on its outer surface, and a sealing plate that seals the opening and a first engagement portion connected to the sealing plate on its inner surface. The sealing plate is connected to the inner surface of the spout via a thin peripheral portion. The cap has an internal thread that screws into the external thread of the spout and a second engagement portion that engages with the first engagement portion; when the external thread and the internal thread are unthreaded, the first engagement portion and the second engagement portion engage, and the sealing plate rotates together with the cap, breaking the thin peripheral portion.

[0004] Patent Document 2 describes a spout stopper comprising a stopper body and a cap. The inner ring of the cap has a first region with a first outer diameter on its outer peripheral surface and a second region with a second outer diameter. The side wall of the stopper body has a first region with a first inner diameter on its inner peripheral surface and a second region with a second inner diameter. When the cap is threaded onto the stopper body, the first region of the inner ring and the first region of the side wall of the stopper body are in close contact over the entire circumference, and the second region of the inner ring and the second region of the side wall of the stopper body are in close contact over the entire circumference. There is a space between the region where the first region of the inner ring and the first region of the side wall of the stopper body are in close contact and the region where the second region of the inner ring and the second region of the side wall of the stopper body are in close contact. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2020-189641 [Patent Document 2] Patent Publication No. 2019-34790 Summary of the Invention [Problem to be solved by the invention]

[0006] A typical carton spout has a structure in which an inner stopper having an opening for dispensing is attached to the carton, and a top lid that closes the opening in the inner stopper is screwed onto the inner stopper. In this structure, if the top lid is overtightened and overruns, a problem occurs in the threaded engagement between the top lid and the inner stopper, making it impossible to ensure a seal and resulting in a loss of hermeticity.

[0007] The present invention is devised to solve the above problems, and aims to provide a spout for a carton that prevents overrun of the top lid, improves sealing performance, and improves operability when opening and closing. [Means for solving the problem]

[0008] In order to achieve the above object, the spout for a carton according to the present invention comprises a stopper to be attached to a carton, an upper lid to be attached to the stopper, and a TE band that forms an annular shape around the axis of the upper lid, the stopper having a threaded cylinder on one side in the axial direction of the stopper, an inner stopper base on the other side, and an inner stopper aperture that penetrates in the axial direction of the stopper, the inner stopper base having TE band fall-off prevention portions on the outside that are provided intermittently around the axial direction of the stopper, the TE band fall-off prevention portions facing the inner peripheral surface of the band in the band radial direction, the threaded cylinder having a male thread portion on its outer peripheral surface, the upper lid having a female thread portion on its inner peripheral surface that is screw-connected to the male thread portion of the threaded cylinder, a knurled surface, a sealing means between the inner plug opening and the top lid, the TE band connected via a bridge to the opening edge end face of the top lid facing in the axial direction of the top lid, a bridge breaking means between the inner plug base and the TE band, an overrun prevention structure between the inner plug base and the top lid, the overrun prevention structure consisting of an upper lid hook portion and a TE band drop-off prevention portion provided on the opening edge end face of the top lid, and when the top lid is closed, the upper lid hook portion abuts against the end face of the TE band drop-off prevention portion around the top lid axis, and the TE band drop-off prevention portion receives the top lid around the top lid axis.

[0009] In the carton spout according to the present invention, the TE band fall-off prevention portion rises from the outer surface of the base of the inside plug in the axial direction of the inside plug, with its tip portion projecting radially outward from the inside plug and shaped to engage with the TE band after the bridge breaks.

[0010] The carton spout of the present invention has a stopper structure between the top lid and the TE band, and the stopper structure consists of a stopper portion provided on the upper surface of the TE band facing the opening edge end surface of the top lid in the direction of the top lid axis, and a second top lid hook portion provided on the opening edge end surface of the top lid, and when the top lid and TE band are attached to the inner plug during the manufacturing process, the second top lid hook portion engages with the stopper portion around the top lid axis, preventing breakage of the bridge.

[0011] In the carton spout of the present invention, the knurling consists of a plurality of plate-like protrusions arranged radially around the axis of the top lid, the plate-like protrusions are spaced apart around the axis of the top lid to form fingerholds, and each plate-like protrusion extends radially outward from the top lid to form the outermost diameter of the top lid.

[0012] In the carton spout of the present invention, the bridge breaking means has a ratchet structure, which is characterized by comprising a plurality of ratchet pawls provided on the outside of the base of the inner plug and a plurality of ratchet teeth provided on the inner surface of the TE band.

[0013] In the carton spout according to the present invention, the TE band is characterized by having a temporary carton holding portion on the outer peripheral surface of the band radially outward from the outermost diameter of the top lid.

[0014] In the carton spout according to the present invention, the sealing means between the inner plug opening and the top lid is characterized by comprising a nozzle opening forming the inner plug opening in a nozzle cylinder formed inside the screw cylinder, and an inner ring formed on the inner top surface of the top lid and inserted into the nozzle opening. [Effects of the Invention]

[0015] With the above configuration, when the top lid is closed, the top lid catch abuts against the end face of the TE band fall-off prevention part and receives the top lid around the center axis of the top lid, preventing overrun of the screw connection between the top lid and the inner plug. This prevents the top lid from being overtightened and also reduces the user's effort by notifying them when the optimal tightening position has been reached. As a result, there is no loss of sealing performance due to imperfections in the screw connection.

[0016] Furthermore, by using the TE band dropout prevention portion, which is intended to prevent the TE band from dropping off after the bridge breaks, as a component of the overrun prevention structure, an overrun prevention structure can be realized with a simple structure.

[0017] Furthermore, the stopper structure reduces the burden on the bridge when the top cover is attached to the inside plug during the manufacturing process, allowing the top cover to be attached to the inside plug without breaking the bridge.

[0018] The radial plate-like protrusions of the knurling form the outermost diameter of the top lid and form a finger grip, increasing the torque around the axis applied to the top lid, making it easier to remove and attach the top lid when opening it and when opening and closing it after opening.

[0019] By providing the bridge breaking means with a ratchet structure, the load on the bridge is reduced when the top cover is attached to the inside plug, and the bridge can be easily broken when opening the bottle.

[0020] By forming a temporary holding portion on the outer peripheral surface of the TE band, the diameter of the TE band can be increased, and the visibility of the TE band is improved.

[0021] The sealing means is made up of a nozzle opening of a nozzle cylinder formed inside the screw cylinder and an inner ring inserted into the nozzle opening, so that even if the screw cylinder is deformed during opening and closing operations, the deformation of the screw cylinder does not affect the nozzle cylinder, and sealing is not affected, thereby achieving more reliable sealing. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a cross-sectional view showing a carton spout according to an embodiment of the present invention; [Figure 2] FIG. 10 is a front view showing the upper cover of the carton spout according to the embodiment. [Figure 3] FIG. 10 is a bottom perspective view showing the upper lid after the carton spout of the upper lid according to the embodiment has been opened. [Figure 4] FIG. 10 is a top view showing the upper cover of the carton spout according to the embodiment. [Figure 5] FIG. 10 is a top perspective view showing the upper cover of the carton spout according to the embodiment; [Figure 6] FIG. 10 is a bottom perspective view showing the upper cover of the carton spout according to the embodiment. [Figure 7]FIG. 3 is a cross-sectional view showing an inner plug of the carton spout according to the embodiment. [Figure 8] FIG. 10 is a top perspective view showing the inner plug of the carton spout according to the embodiment; [Figure 9] FIG. 10 is a front view showing the inner plug of the carton spout according to the embodiment. [Figure 10] FIG. 10 is a top view showing the inner plug of the carton spout according to the embodiment. [Figure 11] FIG. 10 is a top perspective view showing the top cover of a carton spout according to another embodiment of the present invention; [Figure 12] FIG. 10 is a bottom perspective view showing the upper cover of the carton spout according to the embodiment. [Figure 13] FIG. 10 is a top perspective view showing the upper cover of a carton spout according to still another embodiment of the present invention. [Figure 14] FIG. 10 is a bottom perspective view showing the upper cover of the carton spout according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of a carton spout according to the present invention will be described with reference to FIGS. Example 1 1 to 10, the carton spout according to the present invention has a scoreless cap and comprises an inner plug 2 to be attached to a carton 1 made of paper or the like, and an upper lid 3 to be attached to the inner plug 2. In the pre-opening state shown in FIGS. 1 to 10, the upper lid 3 integrally holds a TE band 29, which will be described later, via a bridge 30.

[0024] The plug 2 has a screw tube 4 on one side in the axial direction of the plug and a plug base 5 on the other side, a nozzle tube 6 inside the screw tube 4, and a plug opening 7 that penetrates in the axial direction of the plug and connects the inside of the carton 1 to the outside.

[0025] The inside plug base 5 has an annular base portion 5a on one side connected to the screw cylinder 4, and a flange portion 5b on the other side that engages with the carton 1. The outer peripheral surface of the base portion 5a has a plurality of ratchet pawls 5c, four in this example. The ratchet pawls 5c are provided at equal intervals around the axial center of the inside plug.

[0026] The plug base 5 also has TE band fall-off prevention sections 8 provided intermittently around the plug axis on the outer surface of the base section 5a. Here, a pair of TE band fall-off prevention sections 8 are provided at symmetrical positions about the plug axis, and each TE band fall-off prevention section 8 is provided within a 90-degree range around the plug axis, with the gap between the pair of TE band fall-off prevention sections 8 forming a drainage channel for water entering from the outside.

[0027] Furthermore, TE band dropout prevention portion 8 rises from the outer surface of base portion 5a in the axial direction of the inner plug, faces band inner peripheral surface 29a in the band radial direction, and has a tip portion 8b that protrudes radially outward in the inner plug direction, forming an undercut shape that engages with TE band 29 after bridge rupture. Furthermore, end face 8a of TE band dropout prevention portion 8 around the axial center of the inner plug abuts against first upper lid hook portion 3c, which will be described later, when the upper lid is closed after the bridge ruptures.

[0028] The screw tube 4 has a male thread portion 9 on its outer surface, and the nozzle tube 6 has a nozzle opening 10 that forms the inner plug opening 7, and has a connection portion 11 on the outer periphery on the inner plug base side that continues to the inner surface of the screw tube 4.

[0029] The top cover 3 has a large knurling 50 on its outer peripheral surface. The knurling 50 is made up of a plurality of, in this case twelve, plate-like protrusions 51 arranged radially around the axis of the top cover, with the plate-like protrusions 51 spaced apart around the axis of the top cover to form fingerholds, and each plate-like protrusion 51 extends radially outward of the top cover 3 to the outer peripheral edge of the flange 3a, forming the outermost diameter of the top cover and forming an input portion 52 that increases the torque around the axis applied to the top cover 3.

[0030] Furthermore, the flange 3a of the top lid 3 forms a ring around the top lid axis along the opening edge, and the opening edge end surface 3b of the flange 3a faces the band upper surface 29b of the TE band 29 in the direction of the top lid axis. The opening edge end surface 3b is provided with a plurality of first top lid hook portions 3c, here a pair of first top lid hook portions 3c, at positions symmetrical with respect to the top lid axis, and further provided with a second top lid hook portion 3d at a position symmetrical with respect to the top lid axis, with the first top lid hook portion 3c and the second top lid hook portion 3d being spaced apart by 90 degrees around the top lid axis.

[0031] The first upper lid hook portion 3c extends radially inward of the upper lid and is shaped so as to be able to abut against the end face 8a of the TE band fall-off prevention portion 8, and the second upper lid hook portion 3d is shaped so as to be able to abut against the stop portion 29d of the TE band 29 described later.

[0032] Furthermore, the top cover 3 has a female thread portion 12 on its inner peripheral surface that screws onto the male thread portion 9 of the screw cylinder 4, and has a first inner ring 13 on its inner top surface that is inserted into the nozzle opening 10 and a second inner ring 14 that is inserted inside the screw cylinder 4. The female thread portion 12 of the top cover 3 has threads 15 formed intermittently around the axis of the top cover 3, and missing portions of the threads 15 form drainage channels 16 for water entering from the outside.

[0033] The second inner ring 14 has an end face 17 at one end abutting the connection portion 11 of the nozzle tube 6 in the axial direction of the upper cover 3, and an outer peripheral surface 19 at one end abutting the inner peripheral surface 20 of the screw tube 4 to form a deformation prevention portion 21.

[0034] The first inner ring 13 abuts against the inner peripheral surface 22 of the nozzle port 10 to form an innermost seal portion 23. The second inner ring 14 has an end face 17 at one end abutting against the connecting portion 11 of the nozzle cylinder 6 to form an intermediate seal portion 24, and an outer peripheral surface 19 at one end abutting against the inner surface of the screw cylinder 4 to form an outermost seal portion 25. Therefore, a sealed structure consisting of multiple seal portions exists between the outside of the top cover 3 and the inside of the inside plug 2.

[0035] Furthermore, since the sealing means consists of the nozzle opening 10 of the nozzle cylinder 6 formed inside the screw cylinder 4 and the first inner ring 13 inserted into the nozzle opening 10, even if the screw cylinder 4 is deformed during opening and closing operations, the deformation of the screw cylinder 4 does not affect the nozzle cylinder 6, and sealing is not affected, thereby achieving more reliable sealing.

[0036] The nozzle cylinder 6 has a pointed protruding shape and a straight cylinder portion 26 that forms the nozzle opening 10, and a conical bottom portion 27 that continues from the connecting portion 11 to the straight cylinder 26, with the bottom portion 27 having a thin, easily deformable portion 28 that can easily deform radially inward. Furthermore, the top cover 3 holds, via a bridge 30, an annular TE band 29 that fits onto the outer periphery of the inside plug base 5 on the opening side.

[0037] The TE band 29 has a plurality of temporary holding portions 32 that protrude radially outward from the outer circumferential surface 29c of the band, located radially outward from the outermost diameter of the top lid, and engage with the surface of the carton 1. The temporary holding portions 32 are provided at appropriate intervals on the outer circumferential surface 29c of the band. Furthermore, a plurality of (here, a pair of) stoppers 29d are provided on the upper surface 29b of the band, protruding toward the axial center of the top lid, and the stoppers 29d are provided symmetrically about the axis of the band. Furthermore, a plurality of ratchet teeth 29e are provided at appropriate intervals circumferentially on the inner circumferential surface 29a of the band, forming a ratchet structure in which the ratchet teeth 29e engage with the ratchet pawls 5c of the inner plug base 5 in the opening direction around the axis of the top lid 3.

[0038] The operation of the above configuration will now be described. With the carton spout according to the present invention, the ratchet structure in which ratchet teeth 29e and ratchet pawl 5c engage with each other serves as bridge breaking means, making it easy to break bridge 30 when opening the carton.

[0039] Additionally, an overrun prevention structure is provided between the inside plug base 5 and the top cover 3, consisting of a first top cover hook 3c provided on the opening edge end surface 3b of the top cover 3 and a TE band fall-off prevention part 8. That is, when the top cover is closed, the first top cover hook 3c abuts against the end surface 8a of the TE band fall-off prevention part 8 around the top cover axis, and the TE band fall-off prevention part 8 receives the top cover 3 around the top cover axis, preventing overrun of the screw connection between the top cover 3 and the inside plug 2. This prevents the top cover 3 from being overtightened and also reduces the user's effort by notifying the user when the optimal tightening position has been reached. As a result, loss of sealing performance due to imperfections in the screw connection is eliminated.

[0040] Furthermore, by using the TE band dropout prevention portion 8, which is intended to prevent the TE band 29 from dropping off after the bridge breaks, as a component of the overrun prevention structure, an overrun prevention structure can be realized with a simple structure.

[0041] In addition, a stopper structure consisting of a stopper portion 29d of the TE band 29 and a second top lid hook portion 3d of the top lid 3 is provided between the top lid 3 and the TE band 29. That is, when the top lid 3 is attached to the inside plug in the manufacturing process, the second top lid hook portion 3d engages with the stopper portion 29d around the axis of the top lid, preventing the bridge 30 from breaking.

[0042] In addition, the radial plate-like protrusions 51 of the knurling 50 form the outermost diameter of the top lid 3 and provide a finger grip, which increases the torque around the axis applied to the top lid 3, making it easier to remove and attach the top lid when opening it and when opening and closing it after opening.

[0043] Furthermore, since the outer surface 19 of one end of the second inner ring 14 abuts against the inner surface 20 of the screw tube 6, the second inner ring 14 acts as a backup against the radially inward force acting on the screw tube 4 when the top cover 3 is tightened, thereby preventing deformation of the screw tube 6.

[0044] As a result, the sealing performance is not impaired due to a problem in the threaded connection between the female thread portion 12 of the top cover 3 and the male thread portion 9 of the inside plug base 3.

[0045] The nozzle cylinder 6 has a thin, easily deformable portion 28, which allows the male thread portion 9, which becomes an undercut during molding, to be easily released from the mold. In other words, the nozzle cylinder 6 deforms at the thin, easily deformable portion 28, which allows the screw cylinder 4 to deform radially inward, preventing damage to the male thread 9 during mold release.

[0046] By providing a sealing structure consisting of multiple seals between the outside of the top lid 3 and the inside of the inside plug 2, the sealing performance is improved. Example 2 11 and 12, in Example 2, the radius of the flange 3a of the top cover 3 is made smaller than the outermost diameter of the knurling 50, thereby exposing the band upper surface 29b of the TE band 29 between the plate-like protrusions 51 and improving the visibility of the TE band 29. Other effects are the same as those of Example 1, and therefore a description thereof will be omitted. Example 3 13 and 14, Example 3 shows a configuration in which the knurling 50 formed on the top cover 3 has eight plate-like protrusions 51. As in Example 2, by making the radius of the flange 3a of the top cover 3 smaller than the outermost diameter of the knurling 50, the band upper surface 29b of the TE band 29 is exposed between the plate-like protrusions 51, improving the visibility of the TE band 29. Other effects are the same as those of Example 1, and therefore a description thereof will be omitted. [Explanation of symbols]

[0047] 1 carton 2 inner stoppers 3 Top lid 3a Tsuba 3b Opening edge end surface 3c First upper cover hook 3d Second upper cover hook 4 Screw barrel 5. Base of inner stopper 5a Base 5b Flange part 5c ratchet pawl 6 nozzle cylinder 7 Inner plug opening 8 TE band fall prevention part 8a End face 8b Tip 9 Male thread 10 nozzle opening 11 Connection 12 Female thread 13 First Inner Ring 14 Second inner ring 15 threads 16 Drainage Channel 17 End face 19 Outer surface 20 Inner surface 21 Deformation prevention part 22 Inner surface 23 Innermost seal 24 Intermediate seal 25 Outermost seal 26 Straight cylinder part 27 Hem 28 Easily deformable part 29 TE band 29a Inner surface of band 29b Top of band 29c band outer surface 29d Stopper 29e Ratchet teeth 30 Bridge 32 Temporary holding section 50 Knurling 51 Plate-like protrusion 52 Input section

Claims

1. The carton includes an inner plug to be attached to the carton, an upper cover to be attached to the inner plug, and a TE band that forms a ring around the axis of the upper cover, The inside plug has a screw cylinder on one side in the axial direction of the inside plug, an inside plug base on the other side, and an inside plug opening that penetrates the inside plug in the axial direction, The inner plug base has TE band dropout prevention portions provided intermittently around the axial center of the inner plug on the outside, and the TE band dropout prevention portions face the inner peripheral surface of the band in the band radial direction, and the screw cylinder has a male thread portion on the outer peripheral surface, The upper cover has a female screw portion on its inner circumferential surface, the female screw portion is screwed to the male screw portion of the screw cylinder, and has a knurled outer circumferential surface; A sealing means is provided between the inner plug opening and the top cover, The TE band is connected to the opening edge end surfaces of the upper covers that face each other in the axial direction of the upper covers via bridges, A bridge breaking means is provided between the base of the inner plug and the TE band, A carton spout characterized in that it has an overrun prevention structure between the inner plug base and the top lid, the overrun prevention structure consisting of an upper lid hook portion and a TE band drop-off prevention portion provided on the opening edge end surface of the top lid, and when the top lid is closed, the upper lid hook portion abuts against the end surface of the TE band drop-off prevention portion around the axis of the upper lid, and the TE band drop-off prevention portion receives the top lid around the axis of the top lid.

2. 2. A spout for a carton according to claim 1, characterized in that the TE band fall-off prevention portion rises from the outer surface of the base of the inside plug in the axial direction of the inside plug, with its tip portion protruding radially outward from the inside plug so as to engage with the TE band after the bridge breaks.

3. A stopper structure is provided between the top cover and the TE band, and the stopper structure comprises a stopper portion provided on the top surface of the TE band facing the opening edge end surface of the top cover in the axial direction of the top cover, and a second top cover hook portion provided on the opening edge end surface of the top cover, A spout for a carton according to claim 1 or 2, characterized in that when the top lid and TE band are attached to the inside stopper during the manufacturing process, the second top lid hooking portion engages with the stopper portion around the axis of the top lid, preventing breakage of the bridge.

4. A spout for a carton according to any one of claims 1 to 3, characterized in that the knurling consists of a plurality of plate-like protrusions arranged radially around the axis of the top lid, the plate-like protrusions are spaced apart around the axis of the top lid to form fingerholds, and each plate-like protrusion extends radially outward from the top lid to form the outermost diameter of the top lid.

5. 5. The spout for a carton according to claim 1, wherein the bridge breaking means is a ratchet structure, the ratchet structure comprising a plurality of ratchet pawls provided on the outside of the base of the inside plug and a plurality of ratchet teeth provided on the inner peripheral surface of the TE band.

6. 6. The spout for a carton according to claim 1, wherein the TE band has a temporary carton holding portion on the outer peripheral surface of the band radially outward from the outermost diameter of the top lid.

7. 7. A carton spout according to claim 1, wherein the sealing means between the inner plug opening and the top lid comprises a nozzle opening in a nozzle cylinder formed inside the screw cylinder, the nozzle opening forming the inner plug opening, and an inner ring formed on the inside top surface of the top lid and inserted into the nozzle opening.

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