Carton spout

Abstract

To provide a spout for a carton having an overrun-proof upper lid, allowing easy separation from a mold, improved in sealability, and improved in opening / closing operability.SOLUTION: In the spout of a carton, an inner plug stem 5 has an opening 7 connected to a carton inside, a screw cylinder 4 has a male screw part 9 on an outer peripheral surface thereof, and a nozzle cylinder 6 has a nozzle port 10 continued to the opening of the inner plug stem 5. The inner plug stem has a connection part 11 continued to an inner peripheral face 20 of the screw cylinder 4 on an outer periphery thereof, a female screw part 12 screwed to the male screw 9 of the screw cylinder 4 on an inner peripheral face of an upper lid 3, a first inner ring 13 inserted into the nozzle port 10 and a second inner ring 14 inserted into the screw cylinder. In the second inner ring 14, one side tip end face 17 abuts on the connection part 11 of the nozzle cylinder 6 to form an overrun preventive part 18, and a circumferential face 19 of the one side tip end abuts on the inner peripheral face 20 of the screw cylinder 4 to form a deformation preventive part 21.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pouring outlet for a carton made of a material such as paper, and particularly relates to a technology that contributes to scoreless.

Background Art

[0002] Conventionally, there is, for example, a pouring outlet for a carton described in Patent Document 1. This is a plastic resin-made stopper attached to a liquid paper container, and is composed of a spout and a cap. The resin constituting the spout has a polyethylene resin as the main component and contains 5% by weight or more of a biomass polyethylene resin.

[0003] The spout is provided with an external thread on the outer surface, and a blocking plate for closing the opening and a first engaging portion connected to the blocking plate are provided on the inner surface. The blocking plate is connected to the inner surface of the spout via a circumferential thin-walled portion. The cap is provided with an internal thread that screws with the external thread of the spout and a second engaging portion that engages with the first engaging portion. When the external thread and the internal thread are screwed off, the first engaging portion and the second engaging portion engage with each other, and the blocking plate is rotated together with the cap to break the circumferential thin-walled portion.

[0004] In addition, what is described in Patent Document 2 is a pouring outlet stopper provided with a stopper body and a cap. The inner ring of the cap has a first region having a first outer diameter and a second region having a second outer diameter on the outer peripheral surface. The side wall of the stopper body has a first region having a first inner diameter and a second region having a second inner diameter on the inner peripheral surface. In a state where the cap is screwed 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] Japanese Patent Publication No. 2020-189641 [Patent Document 2] Japanese Patent Publication No. 2019-34790 [Overview of the project] [Problems that the invention aims to solve]

[0006] Traditionally, cartons have either a pull-open spout or a scoreless spout.

[0007] For products with a pull-open mechanism, opening requires two steps: removing the top lid and then pulling the pull-open mechanism to break it open.

[0008] The scoreless bottles have a stopper that is pushed into the spout to ensure airtightness both when unopened and after opening, and the top lid is fitted tightly, requiring force to twist the lid when opening. For this reason, knurling is provided on the outer surface of the top lid to allow sufficient force to be applied.

[0009] However, conventional knurling forms numerous fine grooves, so when a user applies pressure to the lid with their fingers to open it, their fingers slip on the knurling, failing to ensure sufficient opening.

[0010] Furthermore, the typical structure for carton spouts involves attaching an inner stopper with a dispensing opening to the carton, and then screwing a top lid onto the inner stopper to close the opening. In this structure, if the top lid is overtightened and overruns, it can cause problems with the screw engagement between the top lid and the inner stopper, resulting in a loss of sealing ability and compromised airtightness.

[0011] Furthermore, during the demolding process when manufacturing the inner plug, it is necessary to forcibly pull the inner plug out of the mold due to the structure of the inner plug, and deformation or damage may occur to the screw threads during this demolding process.

[0012] The present invention aims to solve the above problems by providing a carton spout that prevents the top lid from overrunning, facilitates mold release, improves sealing performance, and enhances operability during opening and closing. [Means for solving the problem]

[0014] The carton spout according to the present invention comprises an inner stopper that is fitted into the carton and an upper lid that is fitted into the inner stopper. The inner stopper has a screw cylinder on one side in the direction of the inner stopper's axis, an inner stopper base on the other side, and a nozzle cylinder inside the screw cylinder. The inner stopper base has an opening that communicates with the inside of the carton, and the outer circumference of the inner stopper base has a carton joining portion that is joined to the carton. The screw cylinder has a male screw portion on its outer circumference, and the nozzle cylinder has a nozzle opening that is connected to the opening of the inner stopper base, and the outer circumference on the inner side of the screw cylinder is connected to the inner surface of the screw cylinder. The top cover has a connecting portion, and the top cover has a female threaded portion on its inner circumferential surface that screws onto the male threaded portion of the screw cylinder, and the inner top surface has a first inner ring that is inserted into the nozzle opening and a second inner ring that is inserted into the inside of the screw cylinder, and the outer circumferential surface of the top cover around its axis has knurling, and the second inner ring has an end face at one end that abuts against the connecting portion of the nozzle cylinder in the axial direction of the top cover to form an overrun prevention portion, and the outer circumferential surface at one end that abuts against the inner circumferential surface of the screw cylinder to form a deformation suppression portion. The nozzle cylinder is characterized by having a thin-walled, easily deformable portion at the conical base following the connection portion, which is easily deformed radially inward.

[0015] The carton spout according to the present invention comprises an inner stopper that is fitted into the carton and an upper lid that is fitted into the inner stopper. The inner stopper has a screw cylinder on one side in the direction of the inner stopper's axis, an inner stopper base on the other side, and a nozzle cylinder inside the screw cylinder. The inner stopper base has an opening that communicates with the inside of the carton, and the outer circumference of the inner stopper base has a carton joining portion that is joined to the carton. The screw cylinder has a male screw portion on its outer circumference, and the nozzle cylinder has a nozzle opening that is connected to the opening of the inner stopper base, and the outer circumference on the inner side of the screw cylinder is connected to the inner surface of the screw cylinder. The top cover has a connecting portion, and the top cover has a female threaded portion on its inner circumferential surface that screws onto the male threaded portion of the screw cylinder, and the inner top surface has a first inner ring that is inserted into the nozzle opening and a second inner ring that is inserted into the inside of the screw cylinder, and the outer circumferential surface of the top cover around its axis has knurling, and the second inner ring has an end face at one end that abuts against the connecting portion of the nozzle cylinder in the axial direction of the top cover to form an overrun prevention portion, and the outer circumferential surface at one end that abuts against the inner circumferential surface of the screw cylinder to form a deformation suppression portion. The device is characterized by having a sealing structure consisting of multiple sealing parts, with the first inner ring contacting the inner circumferential surface of the nozzle opening to form the innermost sealing part, the end face of one end of the second inner ring contacting the connection part of the nozzle cylinder to form an intermediate sealing part, and the outer circumferential surface of one end of the second inner ring contacting the inner circumferential surface of the screw cylinder to form the outermost sealing part, between the outside of the top lid and the inside of the inner stopper.

[0016] The carton spout according to the present invention is characterized in that the female screw portion of the top lid has screw threads intermittently formed around the axis of the top lid and has a drainage channel for externally infiltrating water.

[0017] The carton spout according to the present invention is characterized in that the top lid has an annular TE band on the opening side that fits around the outer circumference of the base of the inner stopper.

[0018] The carton spout according to the present invention is characterized in that the top lid consists of a plurality of plate-shaped protrusions arranged radially from the axis of the top lid, the plate-shaped protrusions are spaced apart from each other around the axis of the top lid to form a finger grip, and each plate-shaped protrusion extends radially outward from the top lid to form an input part that increases the torque applied to the top lid around the axis. [Effects of the Invention]

[0019] With the above configuration, a structure can be realized in which the second inner ring serves as both an anti-overrun prevention part and a deformation suppression part. That is, by the end face of one side tip of the second inner ring abutting and being fixed against the connection part of the nozzle cylinder, over-tightening of the upper lid is prevented, and by notifying the user that the optimal tightening position has been reached, the labor of the user can be reduced. Further, by the outer peripheral surface of one side tip of the second inner ring abutting against the inner peripheral surface of the screw cylinder, the second inner ring acts as a backup against the radially inward force acting on the screw cylinder when tightening the upper lid, and suppresses deformation of the screw cylinder. As a result, the sealing performance is not impaired due to screw joint defects.

[0020] Since the nozzle cylinder has a thin-walled and easily deformable part, the screw part that becomes an undercut during molding can be easily demolded. That is, by the nozzle cylinder deforming in the thin-walled and easily deformable part, deformation of the screw cylinder is allowed, and damage to the screw part during demolding can be prevented.

[0021] Therefore, it is possible to simultaneously realize the conflicting problems of suppressing deformation of the screw cylinder by the second inner ring when attaching the upper lid and facilitating deformation of the screw cylinder during demolding.

[0022] By providing a sealing structure composed of multiple seal parts between the outside of the upper lid and the inside of the middle plug, the sealing performance as a scoreless cap is improved.

[0023] By intermittently forming the thread of the female screw part of the upper lid, even if external intrusion water during manufacturing, for example, shower cooling water, intrudes into the upper lid, the threaded part functions as a drainage path, and the external intrusion water can be reliably discharged.

[0024] The radial plate-like protrusions of the knurling form a finger hold and serve as an input part that increases the torque around the axis applied to the upper lid, so that the attachment / detachment operation of the upper lid during opening, closing after opening can be easily performed.

Brief Description of the Drawings

[0025] [Figure 1]Cross-sectional view showing the pouring outlet for a carton according to an embodiment of the present invention [Figure 2] Front view showing the pouring outlet for a carton according to the same embodiment [Figure 3] Plan view showing the pouring outlet for a carton according to the same embodiment [Figure 4] Perspective view showing the upper lid of the pouring outlet for a carton according to the same embodiment [Figure 5] Front view showing the upper lid of the pouring outlet for a carton according to the same embodiment [Figure 6] Perspective view showing the inner stopper of the pouring outlet for a carton according to the same embodiment [Figure 7] Front view showing the inner stopper of the pouring outlet for a carton according to the same embodiment [Figure 8] Bottom view showing the inner stopper of the pouring outlet for a carton according to the same embodiment [Figure 9] Perspective view showing the upper lid of the pouring outlet for a carton according to another embodiment of the present invention

Embodiments for Carrying out the Invention

[0026] Hereinafter, embodiments of the pouring outlet for a carton according to the present invention will be described with reference to FIGS. 1 to 8. (Example 1) In FIGS. 1 to 8, the pouring outlet for a carton according to the present invention includes an inner stopper 2 attached to a carton 1 made of scoreless cap paper or the like, and an upper lid 3 attached to the inner stopper 2.

[0027] One side of the inner stopper 2 in the direction of the inner stopper axis forms a screw cylinder 4, the other side forms an inner stopper base 5, and a nozzle cylinder 6 is provided inside the screw cylinder 4.

[0028] The inner stopper base 5 has an opening 7 communicating with the inside of the carton 1 and a carton joint portion 8 engaging with the carton 1 on the outer periphery.

[0029] The screw cylinder 4 has a male screw portion 9 on the outer peripheral surface, the nozzle cylinder 6 has a nozzle opening 10 continuous with the opening 7 of the inner stopper base 5, and a connecting portion 11 continuous with the inner peripheral surface of the screw cylinder 4 on the outer periphery on the inner stopper base side.

[0030] The top cover 3 has a large knurled surface 50 around its axis. The knurled surface 50 consists of a plurality of plate-shaped protrusions 51, in this case eight, arranged radially from the axis of the top cover. The plate-shaped protrusions 51 are spaced apart around the axis of the top cover 3 to form a finger grip, and each plate-shaped protrusion 51 extends radially outward from the top cover 3, forming an input section 52 that increases the torque applied to the top cover 3 around its axis.

[0031] Furthermore, the top cover 3 has a female threaded portion 12 on its inner circumference that is screw-connected to the male threaded portion 9 of the screw cylinder 4, and a first inner ring 13 that is inserted into the nozzle opening 10 and a second inner ring 14 that is inserted inside the screw cylinder 4 on its inner top surface. The female threaded portion 12 of the top cover 3 has threads 15 intermittently formed around the axis of the top cover 3, and the missing parts of the threads 15 form a drainage channel 16 for externally infiltrating water.

[0032] The second inner ring 14 has an end face 17 at one end that abuts against the connection portion 11 of the nozzle cylinder 6 in the axial direction of the top cover 3, forming an overrun prevention portion 18, and an outer peripheral surface 19 at one end that abuts against the inner peripheral surface 20 of the screw cylinder 4, forming a deformation suppression portion 21.

[0033] The first inner ring 13 abuts against the inner circumferential surface 22 of the nozzle opening 10 to form the innermost sealing portion 23. The second inner ring 14 has an end face 17 at one end abutting against the connection portion 11 of the nozzle cylinder 6 to form an intermediate sealing portion 24, and an outer circumferential surface 19 at one end abutting against the inner surface of the screw cylinder 4 to form the outermost sealing portion 25. Therefore, a sealing structure consisting of multiple sealing portions exists between the outside of the top cover 3 and the inside of the inner stopper 2.

[0034] Furthermore, the nozzle cylinder 6 has a pointed, protruding shape and includes a straight cylindrical portion 26 that forms the nozzle opening 10, and a conical base portion 27 that extends from the connecting portion 11 to the straight cylinder 26. The base portion 27 has a thin-walled, easily deformable portion 28 that is easily deformed radially inward.

[0035] Furthermore, the top cover 3 holds an annular TE band 29 that fits onto the outer circumference of the inner plug base 5 on the opening side, via a bridge 30. The TE band 29 is prevented from coming off by engaging with an undercut formed on the outer circumference of the inner plug base 5 at an engaging portion 31 that protrudes radially inward formed on the inner circumferential surface of the inner plug base 5, in the axial direction of the inner plug base 5.

[0036] The carton joint 8 has a raised portion 33 intermittently formed around the axis of the plug base 5 on the outside of the TE band 29, and a notch 34 forms a drainage channel 35. Multiple temporary holding portions 36 are provided at appropriate intervals on the outer surface of the raised portion 33, protruding radially outward and engaging with the surface side of the carton 1. Furthermore, the outside of the raised portion 33 has a flange portion 37 that engages with the back side of the carton 1.

[0037] Furthermore, the TE band 29 has a stopper portion 29a at a position facing the top cover 3 in the axial direction of the top cover, and the top cover 3 has a top cover engagement portion 3a that engages with the stopper portion 29a around the top cover axis, so that when the top cover 3 is attached to the inner plug 2 during the manufacturing process, the lid engagement portion 3a engages with the stopper portion 29a around the top cover axis, preventing the bridge 30 from breaking.

[0038] The operation of the above configuration will now be explained. According to the carton spout of the present invention, a structure can be realized in which the second inner ring 14 serves as both an overrun prevention part 18 and a deformation suppression part 21.

[0039] In other words, the end face 17 of one end of the second inner ring 14 abuts against the connection portion 11 of the nozzle cylinder 6, preventing the top cover 3 from being overtightened and reducing the user's effort by informing them that the optimal tightening position has been reached.

[0040] Furthermore, the outer circumferential surface 19 of one end of the second inner ring 14 abuts against the inner circumferential surface 20 of the screw cylinder 6, so that the second inner ring 14 acts as a backup against the radially inward force acting on the screw cylinder 4 when the top cover 3 is tightened, thereby suppressing deformation of the screw cylinder 6.

[0041] As a result, the sealing performance will no longer be compromised due to a faulty screw connection between the female screw portion 12 of the top cover 3 and the male screw portion 9 of the inner plug base 3.

[0042] The nozzle cylinder 6 has a thin-walled, easily deformable portion 28, which allows for easy demolding of the male thread portion 9, which would otherwise be undercut during molding. In other words, the deformation of the nozzle cylinder 6 at the thin-walled, easily deformable portion 28 allows for radial inward deformation of the thread cylinder 4, preventing damage to the male thread 9 during demolding.

[0043] Therefore, it is possible to simultaneously achieve the conflicting goals of preventing deformation of the screw cylinder 4 by the second inner ring 14 when the top cover 3 is attached, and facilitating deformation of the screw cylinder 4 during demolding.

[0044] By providing a sealing structure consisting of multiple sealing parts between the outside of the top lid 3 and the inside of the inner stopper 2, the airtightness as a scoreless cap is improved.

[0045] By intermittently forming the threads of the female screw portion 9 of the top cover 3, even if external water, such as shower cooling water, enters the interior of the top cover 3 during manufacturing, the threaded portion functions as a drainage channel 16, ensuring that the external water is reliably discharged.

[0046] The radial plate-like protrusions 51 of the knurling form a finger grip and act as an input part that increases the torque applied around the axis of the top lid 3, thereby facilitating the removal and attachment of the top lid 3 during opening and closing after opening. (Example 2) In the above embodiment 1, the knurling 50 formed on the top lid 3 is shown to have eight plate-like protrusions 51. However, as shown in Figure 9, the knurling 50 formed on the top lid 3 can also have twelve plate-like protrusions 51. [Explanation of Symbols]

[0047] 1 carton 2. Inner stopper 3 Top lid 3a Lid retaining part 4 Screw tube 5. Base of the inner plug 6 Nozzle cylinder 7 hole 8. Carton joint 9 Male threaded section 10 Nozzle openings 11 Connection part 12 Female thread section 13. First Inner Ring 14. Second inner ring 15 screw threads 16 Drainage Channel 17 End face (second inner ring) 18 Overrun prevention unit 19 Outer surface (second inner ring) 20 Inner surface (screw cylinder) 21 Deformation suppression part 22 Inner surface (nozzle opening) 23 Innermost seal section 24 Intermediate seal section 25 Outermost seal section 26 Straight cylinder part 27 Hem 28. Parts that are easily deformable 29 TE band 29a Stopper part 30 Bridge 31 Engaging part 32 TE band holding part 33 Ridge 34 Notch 35 Drainage Channel 36 Temporary holding part 37 Flange section 50 knurled 51 Plate-like projections 52 Input section

Claims

1. It has an inner stopper that fits into the carton and an outer lid that fits into the inner stopper. The inner plug has a threaded cylinder on one side in the direction of the inner plug's axis, an inner plug base on the other side, and a nozzle cylinder inside the threaded cylinder. The stopper base has an opening that communicates with the inside of the carton, and the outer circumference of the stopper base has a carton joining portion that connects to the carton. The screw cylinder has a male threaded portion on its outer surface. The nozzle cylinder has a nozzle opening that follows the opening at the base of the inner plug, and has a connecting portion on the outer circumference of the inner plug base that follows the inner surface of the screw cylinder. The top cover has a female threaded portion on its inner circumference that connects to the male threaded portion of the screw cylinder, a first inner ring that is inserted into the nozzle opening and a second inner ring that is inserted into the inside of the screw cylinder on its inner top surface, and knurling on the outer circumference of the top cover around its axis. The second inner ring has an end face at one end of the top cover that abuts against the connection part of the nozzle cylinder in the axial direction of the top cover to form an overrun prevention part, and an outer circumferential surface at one end of the top abuts against the inner circumferential surface of the screw cylinder to form a deformation suppression part. The nozzle barrel is characterized by having a thin-walled, easily deformable portion at the conical base following the connection portion, which is easily deformed radially inward.

2. It has an inner stopper that fits into the carton and an outer lid that fits into the inner stopper. The inner plug has a threaded cylinder on one side in the direction of the inner plug's axis, an inner plug base on the other side, and a nozzle cylinder inside the threaded cylinder. The stopper base has an opening that communicates with the inside of the carton, and the outer circumference of the stopper base has a carton joining portion that connects to the carton. The screw cylinder has a male threaded portion on its outer surface. The nozzle cylinder has a nozzle opening that follows the opening at the base of the inner plug, and has a connecting portion on the outer circumference of the inner plug base that follows the inner surface of the screw cylinder. The top cover has a female threaded portion on its inner circumference that connects to the male threaded portion of the screw cylinder, a first inner ring that is inserted into the nozzle opening and a second inner ring that is inserted into the inside of the screw cylinder on its inner top surface, and knurling on the outer circumference of the top cover around its axis. The second inner ring has an end face at one end of the top cover that abuts against the connection part of the nozzle cylinder in the axial direction of the top cover to form an overrun prevention part, and an outer circumferential surface at one end of the top abuts against the inner circumferential surface of the screw cylinder to form a deformation suppression part. A carton spout characterized by having a sealing structure consisting of multiple sealing parts, with a first inner ring contacting the inner circumferential surface of the nozzle opening to form the innermost sealing part, one end face of the tip of the second inner ring contacting the connection part of the nozzle cylinder to form an intermediate sealing part, and the outer circumferential surface of one end of the second inner ring contacting the inner circumferential surface of the screw cylinder to form the outermost sealing part, between the outside of the top lid and the inside of the inner stopper.

3. The carton spout according to claim 1 or 2, characterized in that the female screw portion of the top lid has screw threads intermittently formed around the axis of the top lid and has a drainage channel for externally infiltrated water.

4. The carton spout according to any one of claims 1 to 3, characterized in that the top lid has an annular TE band that fits onto the outer circumference of the base of the inner stopper on the opening side.

5. The top lid is characterized in that the knurling consists of a plurality of plate-like protrusions arranged radially from the axis of the top lid, the plate-like protrusions are spaced apart from each other around the axis of the top lid to form a finger grip, and each plate-like protrusion extends radially outward from the top lid, forming an input part that increases the torque applied to the top lid around the axis.

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