JP2004059090A - Dripproof spout - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quite new seal opening system in which a liquid drip can be prevented well while achieving a complete sealing characteristic of a spout at its distribution preservation at first. <P>SOLUTION: The spout comprises a spout 4 protruded at the top part 3 of a paper container 2 for liquid and a cap 5 screwed to and installed at the spout 4. This spout is provided with an inclined surface 12 in which the outercircumference of an upper end surface 11 of a pouring cylinder 6 of the spout 4 occupies a lower level at its outer circumferential edge. An outer wall surface 6A communicating with an outer circumferential edge 11A of the inclined surface 12 of the pouring cylinder 6 is positioned more inside than an imaginary vertical line P passing through the outer circumferential edge 11A of the inclined surface 12. A crossing point between the inclined surface 12 and the outer circumferential edge 11A is formed into a sharp shape. The upper end surface 11 except the inclined surface 12 is formed into a substantially flat surface. The upper end surface 11 of the pouring cylinder 6 is provided with a lid 13 thermally melted and adhered to it in such a way that it can be peeled off. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a spout for a liquid paper container in which a cap is screwed onto a spout protruding from the top of the container, and more particularly to a spout for a small-capacity liquid paper container.
[0002]
[Prior art]
Conventionally, in a liquid paper container 01 for storing soy sauce, vinegar, oil, sauce, sake, etc., in consideration of ease of use, for example, as shown in FIG. A liquid paper container 01 is widely used in which a cap 05 and a spout 04 are projected from a gabled roof-shaped inclined plate 02 at the top. The spout 05 is formed by screwing a cap 03 onto a spout tube 06 of a spout 04 protruding from the container 01. The structure shown in FIG. 7 has been widely adopted in order to have both the perfect sealing property at the time of distribution storage and the easy opening property at the time of use. That is, the sealing plate 07 is provided below the inside of the pouring tube 06 and sealed. At the opening position of the sealing plate 07, there is provided a cut-out portion 09 having an annular thin-walled weak portion 08 provided therearound. A column 011 having a pull ring 010 at its upper end is provided upright on an inner peripheral edge of the cutout 09. To open the spout 05, the cap 03 is removed, and the pull ring 010 housed inside the spouting tube 06 is pulled over the fingertip. By doing so, the annular thin fragile portion 08 provided around the cutout 09 is torn open. The opened spout 04 is screwed with the cap 03 and sealed again.
[0003]
By the way, in recent years, such a liquid paper container has been required to have a small capacity such as 200 milliliters, and the injecting cylinder tends to have a small diameter inevitably.
[0004]
Also, in this type of liquid paper container, how to properly prevent liquid dripping is a major issue. Conventionally, as shown in FIG. 9, the upper end 012 of the spout 04 is expanded outward, and Those with rounded edges are used.
[0005]
Therefore, the present inventors have conducted various studies on the plug in the small-capacity liquid paper container by using the above-mentioned conventional technology. As a specific structure, the spout 04 shown in FIG. 9 was used in which the upper end was expanded outward and the edge was rounded. Also, as a structure for achieving both the perfect sealing property at the time of distribution storage and the easy opening property at the time of use, a prototype having a sealing plate with a pull ring therein as shown in FIGS. Decided to test.
[0006]
[Problems to be solved by the invention]
However, when the above-mentioned conventional plug is applied to such a small-volume container, various problems have been found. First, it is difficult to open the spout. To open the spout, put your fingertip on the pull ring housed inside the spout spout cylinder and pull it. . As a result, the opening method using the spout could hardly be applied to a spout having a small diameter. In addition, when the spout is manufactured by injection molding, the pull ring is caught by the mold, making it difficult to release the spout, and causing problems such as damage to the annular thin-walled fragile portion.
[0007]
Therefore, as a next measure, the adoption of a sealing plate provided with a pull ring was abandoned, and a method of sealing the upper end of the dispensing cylinder with a sealing material was taken.
However, in the conventional dispensing cylinder shown in FIG. 9, since the edge of the upper end has a radius, it is very difficult to attach the sealing material, and it has been found that the desired desired seal cannot be expected at all. . In addition, since the sealing material was heat-sealed, the upper end of the pouring cylinder was melted by heat, and the melted and softened resin swelled outward from the upper end and tended to be deformed. As a result, it was also found that a large radius portion protruding from the outer periphery of the upper end face of the pouring cylinder was formed, and this portion increased the adhesive force of the liquid as much as possible, and the function of preventing liquid dripping was greatly impaired.
[0008]
Therefore, the present inventors provide a completely new opening method from such a viewpoint. First, the spout is prevented from dripping while easily achieving the perfect sealing property at the time of distribution and storage of the spout. The task is to prevent it successfully. Second, it is an object to further reduce dripping as much as possible.
[0009]
[Means for Solving the Problems]
In order to solve the above technical problems, a liquid dripping prevention plug according to claim 1 of the present invention comprises a spout protruding from the top of a liquid paper container and a cap screwed to the spout. The spout comprises an outer peripheral portion of an upper end surface of the spout cylinder, the outer peripheral surface of which is provided with an inclined surface which is lower toward the outer peripheral edge, and an outer wall surface continuous with the outer peripheral edge of the inclined surface of the spout cylinder has the inclined surface. Is located more inward than a virtual vertical line passing through the outer peripheral edge, the intersection between the inclined surface and the outer peripheral surface is sharply formed, and the upper end surface excluding the inclined surface is formed as a substantially flat surface. A lid that is heat-sealed so as to be peelable is provided on the upper end surface of the pouring cylinder.
[0010]
[Action]
In the anti-dripping spout with the above configuration, first remove the cap, and then peel off the sealing material that has been heat-sealed to the upper end surface of the dispensing tube by pulling it upward from the upper end surface. Can be opened. This opening operation is easier and more reliable than the conventional method of pulling the pull ring to tear the sealing plate.
[0011]
Further, the outer peripheral portion of the upper end surface of the spout pouring cylinder is formed on an inclined surface that is lower toward the outer peripheral edge, and the intersection point with the outer wall surface connected to the outer peripheral edge of this inclined surface of the spout cylinder is formed sharply. Thereby, dripping can be effectively prevented. In other words, when the sealing material is heat-sealed, the upper end of the pouring cylinder is melted by the heat generated during this heat-sealing, and the melted and softened resin tends to swell outward from the upper end and deform. Can be However, as shown in FIGS. 3 and 4, since an inclined surface exists at the outer peripheral portion of the upper end surface, a gap is formed between the lower surface of the lid and the inclined surface, and the molten material which is about to swell is formed. The swelling of the resin is absorbed in the voids. In addition, since the inclined surface is formed, the amount of melting at the upper end surface of the pouring cylinder is overwhelmingly smaller than, for example, when the upper end surface of the pouring cylinder is flattened. Therefore, the melted and softened resin does not bulge outward from the outer peripheral portion of the upper end surface of the pouring cylinder. As a result, the outer peripheral portion of the upper end surface of the pouring cylinder always has an edge kept at an acute angle, and the function of preventing liquid dripping is properly maintained.
[0012]
【The invention's effect】
Therefore, the anti-dripping plug according to claim 1 of the present invention has the following effects.
The pull-out tube is opened only by pulling the sealing material upward and peeling the spout from the upper end surface of the spout-out tube. Therefore, as compared with the conventional method of pulling the pull ring and tearing the sealing plate, the spout can be opened without inserting the fingertip into the inside of the spout cylinder. As a result, the opening area of the pouring cylinder can be reduced as much as possible, and for example, a spout that can be sufficiently applied to a very small volume container of 200 ml or less can be obtained.
[0013]
In addition, the upper end surface of the dispensing cylinder, except for the inclined surface, is formed almost flat, so that the lid material can be accurately heat-sealed and the initial sealing performance can be significantly improved. Became. In addition, when the sealing material is heat-sealed, the melted and softened resin does not swell outward from the outer peripheral portion of the upper end surface of the pouring cylinder, and the outer peripheral portion of the upper end surface of the pouring cylinder has an acute angle. Because of the presence of such a sharp edge, the danger of the inner solution dripping from the outer periphery of the upper end surface of the dispensing cylinder can be reduced as much as possible, and the function of preventing liquid dripping can be maintained properly.
[0014]
In addition, in the liquid dripping prevention plug according to the present invention, as described in claim 2, the inner peripheral surface of the pouring cylinder is provided with a small diameter portion in a lower part of the upper end opening of the pouring cylinder, It is desirable that the opening amount of the small diameter portion is set to an opening amount smaller than the opening amounts above and below the small diameter portion.
In other words, by narrowing the root diameter smaller than the mouth diameter, the depressurizing force in the container can be effectively applied, and the liquid at the mouth of the spout and further at the upper end surface of the spout can be accurately removed from the container. Because it can be returned inside.
[0015]
Furthermore, in the liquid dripping prevention plug according to the present invention, as described in claim 3, the inner peripheral surface of the spouting cylinder connected vertically above and below the small diameter portion has an inclined surface whose diameter gradually decreases as reaching the small diameter portion. It is desirable to be formed.
This is because the residual liquid at the spout can be smoothly flowed down into the container with low flow resistance, and the residual liquid can be more accurately returned into the container.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Hereinafter, a first embodiment of a plug for preventing dripping according to the present invention will be described with reference to FIGS.
As shown in FIG. 5, the anti-dripping plug 1 is a plug comprising a spout 4 projecting from the top 3 of the liquid paper container 2 and a cap 5 screwed to the spout 4. This is a so-called internal plug, in which the upper surface of the flange 7 below the spout tube 6 of the spout 4 is heat-sealed and adhered to the inner surface of the liquid paper container 2 by ultrasonic sealing or the like. The cap 5 is injection-molded using polypropylene, polyethylene, or the like. The spout 4 is usually injection-molded using polyethylene.
[0017]
As shown in FIG. 4, the structure of one embodiment of the anti-dripping spigot according to the present invention is that a screw portion 8 (female screw) with the spout 4 is provided on the inner peripheral surface of the cap 5. 4 is provided with a threaded portion 9 (male thread) with the cap 5 on the lower outer peripheral surface 4A, and the flange 7 is provided below the pouring cylinder 6.
[0018]
As shown in FIGS. 1 and 2, the upper part of the spout cylinder above the screwing part 9 provided on the lower outer peripheral surface 4 </ b> A of the spout 4 has a small-diameter root part 10 whose inner and outer surfaces are once narrowed. Above the small diameter base portion 10, the upper end surface 11 is formed while expanding again. That is, the opening amount of the small-diameter root portion 10 is set to be smaller than the opening amounts of the outlet 6C at the upper end and the opening 6D at the lower end of the pouring tube 6. As shown in the drawing, the inclination angle β of the outer wall surface 6A extending from the outer surface side root portion 10A of the small diameter root portion 10 to the upper end surface 11 is appropriately set in the range of 50 degrees to 80 degrees. In addition, the inclination angle α of the inner surface 6B of the small-diameter root portion 10 from the inner-side root portion 10B to the upper end surface 11 is appropriately set in a range of 45 ° to 75 °. As for the correlation between the two inclination angles, it is desirable that the outer wall surface 6A is always in the range of plus 5 to 10 degrees with respect to the inner surface 6B. In addition, the root portion 10B on the inner surface side is formed in a vertical wall in the vertical direction, and the vertical dimension thereof is set to about 1.5 to 2.0 mm. Further, between the root portion 10 and the lower threaded portion 9, both the outer wall surface 6A and the inner surface 6B are formed as inclined surfaces whose diameter gradually increases toward the lower side. Further, the inclined surface on the inner surface 6B side continues to a portion corresponding to the upper end portion of the screwing portion 9, and thereafter is formed as a vertical surface having the same diameter up to the opening 6 at the lower end.
[0019]
As shown in FIG. 2, the upper end surface 11 is formed on an inclined surface 12 whose outer peripheral portion is lower as the outer peripheral edge 11A. Then, an outer wall surface 6A continuous with the outer peripheral edge 11A of the inclined surface 12 of the pouring cylinder 6 is positioned inside (inward) the virtual vertical line P passing through the outer peripheral edge 11A of the inclined surface 12, and the inclined surface The intersection of the outer wall 12A and the outer wall 6A, that is, the outer peripheral edge 11A is sharply formed. Further, the upper end surface 11 of the pouring cylinder 6 is formed as a horizontal flat surface, and a lid 13 which is heat-sealed so as to be peelable is adhered thereto (see FIGS. 3 and 4). The horizontal length X between the outer peripheral edge 11A and the upper end edge 11B of the inclined surface 12 is set to 1.5 to 2.0 mm. Preferably, it is 1.0 mm. The vertical length Y between the outer peripheral edge 11A and the upper end edge 11B of the inclined surface 12 is set to 0.05 to 0.2 mm. Preferably, it is 0.1 mm.
[0020]
The lid 15 is made of aluminum foil, but may be replaced with a polyethylene film or the like on which a metal oxide such as silicon oxide or aluminum oxide is deposited, if necessary.
[0021]
In the above configuration, the lid 13 is thermally bonded to the upper end surface 11 of the pouring cylinder 6, but since the upper end surface 11 is formed to be almost flat, the thermal bonding of the lid 13 is securely performed, and Sealability is significantly improved. At this time, the upper end surface 11 is melted by heat, and the resin that has been melted and softened swells outward from the upper end surface 11 and tends to be deformed by the combined pressing force from above. However, since the inclined surface 12 exists on the outer peripheral portion of the upper end surface 11, a gap portion A is formed between the lower surface of the lid 13 and the inclined surface 12, and the molten resin that is about to swell is not shown in FIG. As shown in FIG. 3, the swelling is absorbed by the gap portion A, and the possibility of reaching the outer peripheral edge 11 </ b> A of the upper end surface 11 can be prevented well. Moreover, since the inclined surface 12 is formed, the amount of melting of the upper end surface 11 of the pouring tube 6 is overwhelmingly smaller than, for example, when the upper end surface 11 of the pouring tube 6 is flattened. . Therefore, the molten resin does not bulge outward from the outer peripheral portion of the upper end surface 11 of the pouring cylinder 6, that is, the outer peripheral edge 11A. As a result, the outer peripheral edge 11A of the upper end surface 11 is always kept at an acute edge as compared with the conventional case where the upper end surface 11 is simply formed flat over the entire area, and the liquid is applied to this portion. Adhesion can be made as low as possible, and the dripping prevention function works properly.
[0022]
The inner surface 6B of the pouring tube 6 is provided with a small-diameter root portion 10 at a lower portion of the upper end opening of the pouring tube 6, and the opening amount of the small-diameter root portion 10 is larger than the opening amounts at the top and bottom. Since the opening amount is set to be small, that is, by narrowing the root diameter smaller than the mouth diameter, the depressurizing force in the container 2 can be effectively applied.
Therefore, the liquid at the mouth of the spout and at the upper end portion of the spout can be accurately returned into the container. In particular, since the inner surface 6B of the spouting cylinder connected vertically above and below the small-diameter root portion 10 is formed on an inclined surface that gradually decreases in diameter as it reaches the small-diameter root portion 10, the residual liquid at the pouring outlet 6C flows downward. The liquid can flow down into the container with little smoothness, and the residual liquid can be more accurately returned into the container.
[0023]
(Second embodiment)
The dripping prevention plug according to the second embodiment of the present invention has the same basic configuration as that of the first embodiment, and the inclined surface extending vertically above and below the root portion 10B of the inner surface 6 faces the vertical plane. It differs in that it is formed. Therefore, detailed description of other configurations, operations, and the like will be omitted.
[0024]
As shown in FIG. 6, the small-diameter root portion 10B is formed in a rectangular ridge, and the upper and lower inner surfaces 6B connected to the root portion 10B are each formed in a vertical plane. Even with this structure, basically, the opening amount of the small-diameter root portion 10 is set to be smaller than the opening amounts above and below it. Therefore, the same effect as in the first embodiment is exhibited in the dripping prevention effect.
[Brief description of the drawings]
FIG. 1 is a sectional view of a stopper for preventing dripping according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the liquid dripping prevention plug according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram of an operation of a liquid dripping prevention plug according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of the first embodiment of the present invention in a state in which a cap of a dripping prevention plug is capped.
FIG. 5 is a partially cutaway external view of a paper container to which a liquid dripping prevention plug according to the first embodiment of the present invention is applied.
FIG. 6 is a sectional view of a stopper for preventing dripping according to a second embodiment of the present invention.
FIG. 7 is an external view of a liquid paper container equipped with a conventional anti-dripping stopper.
FIG. 8 is a cross-sectional view of a main part of a conventional liquid dripping prevention plug.
FIG. 9 is a partially cutaway sectional view of a main part showing another embodiment of a conventional liquid dripping prevention plug.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid dripping prevention stopper, 4 ... Spout, 5 ... Cap, 6 ... Outlet cylinder, 6A ... Outer wall surface, 6B ... Inner surface, 6C ... Outlet, 6D ... Opening, 9 ... Screw part, 10 ... Root part , 10A: Root portion on the outer surface side, 10B: Root portion on the inner surface side, 11: upper end surface, 11A: outer peripheral edge, 11B: upper end edge, 12: inclined surface, 13: lid (seal material), A: void portion, P: virtual vertical line.

Claims (3)

A spout protruding from the top of the liquid paper container and a cap screwed to the spout and being attached to the spout, wherein the outer peripheral portion of the upper end surface of the spout pouring cylinder is lower toward the outer peripheral edge. Surface, and an outer wall surface continuous with the outer peripheral edge of the inclined surface of the pouring cylinder is located inward of a virtual vertical line passing through the outer peripheral edge of the inclined surface, and an intersection point between the inclined surface and the outer peripheral surface is provided. Is formed sharply, the upper end surface excluding the inclined surface is formed substantially flat, and the upper end surface of the pouring cylinder is provided with a lid that is heat-sealed so as to be peelable. Drip prevention stopper. The inner peripheral surface of the dispensing cylinder is provided with a small-diameter portion in a lower part of the upper end opening of the dispensing cylinder, and the opening of the small-diameter portion is set to be smaller than the upper and lower openings. Item 4. A stopper for preventing dripping according to Item 1. 3. The anti-dripping spout according to claim 2, wherein the inner peripheral surface of the pouring cylinder connected vertically above and below the small-diameter portion is formed as an inclined surface that gradually decreases in diameter toward the small-diameter portion.

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