spout

Abstract

To reliably realize a seal performance of a spout and an inside plug even when a spout body and the inside plug are integrally molded via a score.SOLUTION: A spout includes a spout body 2 being a mouth of a container, an upper lid 4 disposed to cover a spout mouth 3, and an inside plug 5 disposed in the upper lid. The inside plug 5 includes an inside plug top part 14 with an outer peripheral edge hooked on an inner surface of the upper lid, a cylindrical part 15 extending from the inside plug top part 14 to the inside of the spout mouth 3, and an annular flap 16 formed at the outer periphery of the tip of the cylindrical part 15. The flap 16 has a form folded back from the tip of the cylindrical part 15 toward the side of the inside plug top part 14, and has a seal part 18 being in close-contact with an inner peripheral surface of the spout mouth 3 at a tip edge separated from an outer peripheral surface of the cylindrical part 15.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spout, and to a technique for integrally molding an inside plug and a spout body. [Background technology]

[0002] Conventional spouts of this type are described, for example, in Patent Document 1. This relates to a spout for a bag-shaped container. This spout for a bag-shaped container includes a welded portion attached to the container, a cylindrical spout portion that communicates with the interior of the bag-shaped container, and a plug that closes the end of the spout portion, with the plug being connected to the end of the spout portion via a breakable thin portion.

[0003] The stopper body has a tubular portion connected to the end of the spout portion via a thin-walled portion, a gripping flange that closes the end face of the tubular portion and extends outward from the tubular portion, and a plate-like protrusion that extends along the flattening direction of the bag-shaped container that is welded to the welding portion.

[0004] Furthermore, the cap described in Patent Document 2 is attached to the mouth of a container body and includes an inner stopper and an overcap. The inner stopper includes a planned opening portion, a fitting portion, and a cylindrical dispensing portion, and the fitting portion and the cylindrical dispensing portion constitute the main body of the inner stopper. The planned opening portion of the inner stopper is also a detachable portion that has a cylindrical appearance with a bottom surface, and is cut off along a score when the stopper is first opened, and the planned opening portion is separated from a horizontal wall formed on the inner periphery of the fitting portion, leaving the horizontal wall, thereby forming an opening. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2014-73858 [Patent Document 2] WO2007 / 126062A1 Summary of the Invention [Problem to be solved by the invention]

[0006] In most common spouts, the spout body, which forms the opening of the container, and the inner stopper that closes the spout opening are molded as a single unit via a score. When opening the container, the score breaks to separate the inner stopper from the spout, and after opening, the cylindrical body of the inner stopper is inserted into the spout opening to close it. In this closed state, the outer periphery of the inner stopper's body is in close contact with the inner periphery of the spout opening, providing a seal.

[0007] When the spout body and inner plug are molded as a single unit, the mold for resin molding consists of an inner mold that corresponds to the inner surfaces of the spout and inner plug, and an outer mold that corresponds to the outer surfaces of the spout and inner plug. The outer mold is split to avoid undercuts that would hinder removal of the molded product.

[0008] As a result, parting lines are formed on the outer surface of the molded product along the parting surfaces of the mold.

[0009] In the case of a structure in which the outer surface of the body of the inner plug is in close contact with the inner surface of the spout opening to ensure sealing performance, the parting line formed on the outer surface of the body of the inner plug becomes a factor that prevents the inner surface of the spout opening and the outer surface of the body of the inner plug from being in close contact with each other, thereby impairing sealing performance.

[0010] The present invention is intended to solve the above-mentioned problems, and aims to provide a spout that can achieve reliable sealing performance between the spout and the inner stopper, even when the spout body and the inner stopper are molded integrally via a score. [Means for solving the problem]

[0011] In order to achieve the above object, the spout according to the present invention comprises a spout body which serves as the opening of a container, an upper lid which is disposed to cover the spout opening, and an inner plug which is disposed within the upper lid, the inner plug having an inner plug top part whose outer peripheral edge engages with the inner surface of the upper lid, a cylindrical part which extends from the inner plug top part into the interior of the spout opening, and a ring-shaped flap formed on the outer periphery of the tip of the cylindrical part, the flap being folded back from the tip of the cylindrical part towards the inner plug top part, and having a sealing part at its tip edge which is spaced apart from the outer peripheral surface of the cylindrical part and which comes into close contact with the inner periphery of the spout opening, The flap has a constricted portion at the boundary between the flap base and the tip of the cylindrical portion on the same side as the outer peripheral surface of the cylindrical portion. It is characterized by:

[0012] The spout of the present invention comprises a spout body that serves as the mouth of the container, a top lid that covers the spout mouth and is screw-connected to the spout body, and an inner stopper that is molded integrally with the spout body and placed inside the top lid, and the inner stopper has an inner stopper top portion whose outer peripheral edge engages with the inner surface of the top lid, a cylindrical portion that extends from the inner stopper top portion toward the spout mouth, and a ring-shaped flap formed on the outer periphery of the tip of the cylindrical portion, the flap extending from the tip of the cylindrical portion toward the opening edge of the spout mouth, the tip edge of the flap connecting to the opening edge of the spout mouth via a score, and a seal portion on the inner surface of the tip of the flap.

[0013] In the spout according to the present invention, the flap has a constricted portion on the same side as the outer peripheral surface of the cylindrical portion, at the boundary between the flap base and the tip of the cylindrical portion.

[0014] In the spout according to the present invention, the flap has a constricted portion on the same side as the inner circumferential surface of the tubular portion, on the side of the flap base portion that continues to the seal portion.

[0015] The spout of the present invention is characterized in that the upper lid and the spout body are screwed together, the tubular portion and the flap are pushed into the interior of the spout opening, the flap is folded back toward the top of the inner plug, and the inner surface of the tip of the flap is inverted from the inner surface side of the tubular portion to the outer surface side, so that the seal portion is tightly pressed against the inner surface of the spout opening, and the score is broken.

[0016] The method for manufacturing a spout according to the present invention includes: For producing the spout described in paragraph number 0011,A method for manufacturing a spout, comprising the steps of: forming an inner stopper integrally with a spout body that forms the opening of a container; placing the inner stopper inside a top lid that covers the spout opening and is screw-connected to the spout body; screw-connecting the top lid and the spout body together to integrally press the inner stopper top section, whose outer edge engages with the inner surface of the top lid, the cylindrical section extending from the inner stopper top section toward the spout opening, and the annular flap expanding from the tip of the cylindrical section toward the opening edge of the spout opening; pushing the cylindrical section and flap into the interior of the spout opening with the tip edge of the flap connected to the opening edge of the spout opening via a score; folding the flap back toward the inner stopper top section and inverting the inner surface of the tip of the flap from the inner side to the outer side of the cylindrical section to bring the seal section formed on the inner surface of the tip of the flap into close contact with the inner surface of the spout opening; and breaking the score. [Effects of the Invention]

[0017] As described above, in the spout of the present invention, the flap is folded back from the tip of the cylindrical portion toward the top of the inner plug, and has a sealing portion at the tip edge that is spaced apart from the outer peripheral surface of the cylindrical portion that is in close contact with the inner peripheral surface of the spout opening.This means that the flap can easily be elastically deformed, and the elastic force can reliably bring the sealing portion into close contact with the inner peripheral surface of the spout opening, thereby reliably achieving the sealing performance of the spout and inner plug.

[0018] When the spout is pushed into the interior of the spout opening with the tip edge of the flap connected to the opening edge of the spout opening via a score, the flap folds back toward the top of the inner plug, the inner surface of the tip of the flap inverts from the inner surface of the cylindrical part to the outer surface, and the seal portion comes into close contact with the inner surface of the spout opening.

[0019] Therefore, when the spout body and inner stopper are molded as a single unit, the sealing portion corresponds to the integral inner mold which is not a split mold, and no parting line that would impede sealing performance is formed in the sealing portion, thereby achieving reliable sealing performance between the spout and inner stopper. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a half-sectional view showing a state after the spout according to the embodiment of the present invention has been set. [Figure 2] FIG. 10 is a half-sectional view showing a state before the spout according to the embodiment is set. [Figure 3] FIG. 10 is an enlarged view of a sealing portion according to the embodiment; [Figure 4] FIG. 10 is a top view of the spout according to the embodiment. [Figure 5] FIG. 10 is a bottom view of the spout according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a spout according to the present invention will be described with reference to the drawings. (Spout configuration) In Figures 1 to 5, the spout 1 has a spout body 2 which serves as the opening of, for example, a bag-shaped container (not shown), an upper lid 4 which is placed to cover the spout opening 3 formed in the spout body 2, and an inner stopper 5 which is placed inside the upper lid 4.

[0022] The spout body 2 has a discharge part 7 with a male thread 6 formed on its outer circumferential surface and a welded part 8 for connection to a container, and the spout opening 3 passes through the discharge part 7 and the welded part 8 .

[0023] The top lid 4 has knurling 9 on its outer peripheral surface and a female screw 10 on its inner peripheral surface, and is screw-connected to the spout body 2 via the male screw 6 and the female screw 10. An inner plug holding portion 11 for holding the inner plug 5 is provided on the inner end side of the top lid 4. The inner plug holding portion 11 protrudes radially inward from the top lid 4, and the surface facing the opening side of the top lid 4 forms a gently inclined surface 12, which engages with the inner plug 5 at the inclined surface 12 and the surface facing the inner end side of the top lid 4.

[0024] The inner plug 5 is molded from resin integrally with the spout body 2, and has an inner plug top part 14 whose outer peripheral edge 13 engages with the inner plug holding part 11 on the inner surface of the top lid, a cylindrical part 15 extending from the inner plug top part 14 toward the inside of the spout opening 3, and a ring-shaped flap 16 formed on the outer periphery of the tip of the cylindrical part 15. (Before setting) As shown in Figure 2, before the spout 1 is set, the flap 16 extends from the tip of the tubular portion 15 toward the opening edge of the spout mouth 3, and the tip edge of the flap is connected to the opening edge of the spout mouth 3 via a score 17, and a seal portion 18 is formed on the inner surface of the tip of the flap.

[0025] Furthermore, the flap 16 has a first constricted portion 19 on the same side as the outer peripheral surface of the tubular portion 15 at the boundary between the flap base and the tip of the tubular portion 15, and a second constricted portion 20 on the same side as the inner peripheral surface of the tubular portion 15 on the flap base side continuing to the seal portion 18. The seal portion 18 and the second constricted portion 20 are shaped so as not to form an undercut.

[0026] A sealing strip 21 is connected to the open end of the top cover 4 via a bridge 22. The sealing strip 21 is loosely fitted into the discharge portion 7 and has an engaging portion 23 on its inner circumferential surface.

[0027] The spout body 2 has an engaged portion 25 on the outer periphery of the base of the discharge portion 7. The engaging portion 23 of the sealing band 21 and the engaged portion 25 of the spout body 2 engage in the axial direction of the spout body 2, thereby locking the sealing band 21. (Setting process) The screw connection between the top lid 4 and the discharge portion 7 of the spout body 2 moves the top lid 4 and sealing band 21 toward the base of the discharge portion 7. The top lid 4 engages with the top portion 14 of the inner plug 5 at the inclined surface 12 of the inner plug holding portion 11 on the inner peripheral surface, pressing the inner plug 5 in the axial direction of the spout body 2 and forcing the tubular portion 15 and the flap 16 into the interior of the spout opening 3.

[0028] Furthermore, when the inner peripheral surface of the top lid 4, the inner plug holding portion 11, overcomes the outer peripheral edge of the inner plug top portion 14, the rear end surface 4a of the top lid 4 abuts against the top surface 14a of the inner plug top portion 14, pressing the inner plug 5 in the axial direction of the spout body 2 and forcing the tubular portion 15 and flap 16 into the inside of the spout opening 3.

[0029] Flap 16 is then pressed in the axial direction of spout body 2 with the flap tip edge connected to the opening edge of spout opening 3 via score 17, so that the flap tip remains in its current position while the flap base connected to tubular portion 15 is pushed into the interior of spout opening 3 together with tubular portion 15. At this time, first constricted portion 19 and second constricted portion 20 facilitate the elastic deformation of flap 16.

[0030] As a result, annular flap 16, which spreads from the tip of tubular portion 15 toward the opening edge of spout opening 3, can be folded back toward inner plug top portion 14, and the inner surface of the tip of the flap is inverted from the inner surface side to the outer surface side of tubular portion 15. Then, seal portion 18 formed on the inner surface of the tip of the flap comes into close contact with the inner peripheral surface of spout opening 3, and score 17 breaks. (After setting) As shown in Figure 1, after spout 1 has been set, flap 16 is folded back from the tip of tubular portion 15 toward inner plug top portion 14, and expands in an annular shape from the tip of tubular portion 15 toward inner plug top portion 14, with the flap tip separated from the outer peripheral surface of tubular portion 15, and seal portion 17 at the edge of the flap tip being subjected to the elastic force of flap 16 and coming into close contact with the inner peripheral surface of spout opening 3. At this time, the presence of second constricted portion 20 facilitates elastic deformation of the flap tip, ensuring sufficient sealing performance of seal portion 17 in close contact with the inner peripheral surface of spout opening 3.

[0031] In addition, the top lid 4 has the inner plug holding portion 11 which overcomes the inner plug top portion 14 due to elastic deformation of the outer peripheral edge of the inner plug top portion 14 and externally fits onto the tip of the discharge portion 7 of the spout body 2, and the rear end surface 4a of the top lid 4 abuts against the top surface 14a of the inner plug top portion 14, pressing the inner plug top portion 14 against the opening edge of the spout opening 3, and the inner plug top portion 14 closes the spout opening 3.

[0032] Furthermore, the sealing strip 21 is loosely fitted to the base of the discharge part 7, and the engaging part 23 reaches a position where it has climbed over the engaged part 25. (When opened) When the top lid 4 is rotated in the opening direction, the top lid 4 moves in a direction to separate from the spout body 2, and the engaging portion 23 of the sealing band 21 and the engaged portion 25 of the spout body 2 engage in the axial direction of the spout body 2 to lock the sealing band 21, and further, the top lid 4 moves in a direction to separate from the spout body 2, causing the bridge 22 to break.

[0033] Furthermore, when the screw connection is loosened and the top lid 4 is moved in the direction of detachment from the spout body 2, the inner plug holding part 11 engages with the outer peripheral edge of the inner plug top part 14, the inner plug 5 is detached from the spout body 2 together with the top lid 4, and the flap 16 comes out of the spout opening 3 while maintaining its folded-back shape, and the plug is opened. [Explanation of symbols]

[0034] 1 spout 2 Spout body 3 Spout 4 Top lid 4a Back end surface 5 inner stopper 6 male thread 7 Discharge part 8 Welded area 9 Knurling 10 female thread 11 Inner stopper holding part 12 Slope 13 Outer rim 14 Top of inner stopper 14a Top 15 Cylindrical part 16 Flap 17 score 18 Seal part 19 First constricted part 20 Second constricted part 21 Sealed Belt 22 Bridge 23 Engagement part 25 Engaged part

Claims

1. The container has a spout body that serves as the opening of the container, an upper lid that is disposed to cover the spout opening, and an inner plug that is disposed inside the upper lid, The inner plug has an inner plug top part whose outer periphery engages with the inner surface of the upper lid, a cylindrical part extending from the inner plug top part to the inside of the spout opening, and an annular flap formed on the outer periphery of the tip of the cylindrical part, the flap is folded back from the tip of the cylindrical portion toward the top portion of the inner plug, and has a seal portion at its tip edge separated from the outer peripheral surface of the cylindrical portion that is in close contact with the inner peripheral surface of the spout opening; A spout characterized in that the flap has a constricted portion on the same side as the outer peripheral surface of the cylindrical portion, at the boundary between the flap base and the tip of the cylindrical portion.

2. The container has a spout body that serves as the opening of the container, an upper lid that covers the spout opening and is screwed to the spout body, and an inner plug that is molded integrally with the spout body and placed inside the upper lid, The inner plug has an inner plug top part whose outer periphery engages with the inner surface of the upper lid, a cylindrical part extending from the inner plug top part toward the spout opening, and an annular flap formed on the outer periphery of the tip of the cylindrical part, The spout is characterized in that the flap extends from the tip of the tubular portion toward the edge of the spout opening, the edge of the flap tip is connected to the edge of the spout opening via a score, and a seal portion is formed on the inner surface of the flap tip.

3. 3. The spout according to claim 2, wherein the flap has a constricted portion at the boundary between the flap base and the tip of the cylindrical portion on the same side as the outer peripheral surface of the cylindrical portion.

4. 3. The spout according to claim 1, wherein the flap has a constricted portion on the same side as the inner circumferential surface of the cylindrical portion, on the side of the flap base portion adjacent to the seal portion.

5. The spout according to claim 2, characterized in that the top lid and the spout body are screwed together, the tubular portion and the flap are pushed into the interior of the spout opening, the flap is folded back toward the top of the inner plug, and the inner surface of the tip of the flap is inverted from the inner surface of the tubular portion to the outer surface, bringing the seal portion into close contact with the inner surface of the spout opening, and the score is broken.

6. A method for manufacturing the spout described in claim 1, comprising the steps of: forming an inner stopper integrally with the spout body, which becomes the opening of a container; placing the inner stopper inside an upper lid that covers the spout opening and is screw-connected to the spout body; and integrally pushing in the inner stopper top part, the outer peripheral edge of which engages with the inner surface of the upper lid, the tubular part extending from the inner stopper top part toward the spout opening, and the annular flap expanding from the tip of the tubular part toward the opening edge of the spout opening, with the tip edge of the flap connected to the opening edge of the spout opening via a score; pushing the tubular part and flap into the inside of the spout opening; folding the flap back toward the inner stopper top part, and inverting the inner surface of the tip of the flap from the inner side to the outer side of the tubular part to bring the seal part formed on the inner surface of the tip of the flap into close contact with the inner surface of the spout opening, and then breaking the score.

Images