JP2002240844A - Spout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spout capable of preventing breakage of a pull-ring when unsealing the spout. SOLUTION: In order to prevent breakage of the pull-ring 11f, a welded part farthest from a stay 11e is formed to be a thick-walled portion of the sectional area larger than that of other portion for reinforcement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to milk, juice,
The present invention relates to a spout to be attached to a container for accommodating alcohol or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a paper container 2 provided with a spout 1 is widely used. As shown in FIG. 9, the spout 1 can easily open a cylindrical nozzle portion 1a, a root flange 1b, a shielding portion 1c for closing the nozzle portion 1a, and a part of the shielding portion 1c. Opening groove 1d provided as described above, and a pull ring 1f and the like connected via a pillar 1e in a region surrounded by the opening groove 1d, and a cap 3 (see FIG. 8) on the nozzle portion 1a.
Is attached. And this spout 1
In order to attach the container to the container 2, the spout 1 with the cap attached is inserted from the inside of the container into the spout mounting hole of the container being assembled, the anvil is positioned inside the container, and the ultrasonic seal is applied from the outside. The ultrasonic horn of the apparatus is pressed, and the ultrasonic horn applies ultrasonic vibration to the joint surface between the container and the flange 1b to generate heat, thereby forming the heat-welding layer on the container surface and the heat-welding flange 1b. It was heat-welded (for example, see Japanese Patent Publication No. 60-50139).
There is also a configuration in which the flange of the spout is attached to the outer surface side of the container. In this case, too, an ultrasonic seal using an anvil and an ultrasonic horn has been used.

In general, the spout 1 is manufactured by injection molding. In the injection molding, a mold having a molding space equal to the shape of the spout to be molded is used. As shown by an arrow P in FIG. 9, it was performed almost at the center of the shielding portion 1c.

[0004]

However, in the above-mentioned conventional spout, when a finger is inserted into the pull ring 1f and pulled to open, the position farthest from the column 1e of the pull ring 1f (the column with the center interposed therebetween). (The side opposite to the portion 1e) was sometimes cut. In rare cases, for example, when ultrasonic sealing is performed under severe conditions such as low temperature, the column 1
In some cases, a pinhole was formed at a thin portion at the bottom of the opening groove 1d at the root of e. Furthermore, although rare,
When the spout was removed from the mold in the molding process of the spout, a part of the opening groove 1d was sometimes broken.

The present invention has been made to solve such a conventional problem, and has as its object to provide a spout capable of preventing the pull ring from breaking. Another object of the present invention is to provide a spout capable of preventing generation of pinholes during ultrasonic sealing and breakage of the opening groove during molding.

[0006]

According to one aspect of the present invention, in order to prevent breakage of a pull ring, a portion where a pull ring is likely to break, that is, a portion farthest from a pillar portion, has a larger sectional area than other portions. It is configured to be a thick portion. When the injection port is injection-molded, the molten resin is injected as shown by an arrow P in FIG. 9, so that the molten resin passes through the support 1 e of the injection port, and is divided into two sides from the top to form a pull ring 1 f. Flow, and meet and join at the position farthest from the strut to form a complete ring. For this reason, a weld portion (seam) where the molten resin abuts and joins is formed at a position of the pull ring 1f farthest from the support portion 1e. It has been found that this weld portion may have a lower strength than other portions depending on the injection conditions and the like, and may cause breakage. Therefore, in the present invention, this portion is reinforced by making it thicker than the other portions, thereby preventing breakage when pulling the pull ring to open it.

[0007] The second invention of the present application is to prevent the pinhole from being generated at the spout by performing ultrasonic sealing and to prevent the opening groove from being broken at the time of molding. Is formed to have a thin portion which facilitates bending deformation. When the spout is removed from the mold in the molding process of the spout, a large tensile force acts on the pull ring. That is, when removing the mold on which the pull ring is formed, in FIG. 9, the mold (upper core) on which the inner surface of the nozzle portion 1a and the outer surface of the pull ring 1f are pulled upward. Since the outer surface of 1f is arc-shaped and the mold has a portion located below the arc, the portion is caught by the pull ring 1f and is difficult to pull out, and a large tensile force acts on the pull ring 1f. For this reason, a large tensile force also acts on the column 1e, and a large tensile force also acts on the bottom of the opening groove 1d at the root of the column 1e. The present inventors have confirmed that, when a large tensile force acts on the opening groove at the base of the support portion, although very rarely, a part of the opening groove may break, But it has a subtle effect on the physical properties of this part,
Accordingly, it has been found that vibrations generated when this spout is ultrasonically sealed may cause a pinhole to be formed at the bottom of the opening groove at the base of the column. Therefore, in the present invention, in order to make it easy to pull out the mold formed with the pull ring, a thin portion which facilitates bending deformation is formed on a part of the circumference of the pull ring. If the thin portion is formed in the pull ring in this manner, the circular pull ring is easily deformed into an elliptical shape when the mold outside the pull ring is pulled out, so that it is easy to fall out of the mold cavity, and when pulling out the mold. Therefore, it is possible to reduce the tensile force acting on the base of the support portion, thereby preventing breakage of a part of the opening groove which may occur at the time of molding and pinhole which may occur at the time of ultrasonic sealing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spout according to one embodiment of the present invention has a cylindrical nozzle portion and a shielding portion formed with an opening groove so as to close the bottom of the nozzle portion and easily open the nozzle. And at a spout provided with a pull ring connected to a region to be opened of the shielding portion via a pillar portion, at a portion farthest from the pillar portion of the pull ring, a thick wall having a larger sectional area than other portions. This feature is characterized by the provision of a thick portion in the welded portion, which is reinforced, so that the pull ring can be prevented from being broken when pulling the pull ring to open it.

A spout according to another embodiment of the present invention comprises:
A cylindrical nozzle portion, a shielding portion formed with an opening groove so that the bottom portion of the nozzle portion can be closed and easily opened, and a pull ring connected to a region to be opened of the shielding portion via a pillar portion. In the provided spout, a thin portion for facilitating bending deformation is provided on a part of the circumference of the pull ring, and by this configuration, the mold of the portion where the pull ring is formed can be used. It becomes easy to pull out, and the pulling force acting on the pull ring and the support portion is reduced, thereby preventing breakage of a part of the opening groove during molding and generation of pinholes during ultrasonic sealing.

Here, in the above-mentioned spout, the area from the end on the shield side to a position exceeding 2/3 of the total height of the pull ring on the outer peripheral surface of the prilling is extended from the end on the shield side to the opposite end. It is preferable to use a tapered surface whose diameter increases toward. With this configuration, it is easier to pull out the mold at the portion where the pull ring is formed, and it is possible to further prevent the occurrence of pinholes during ultrasonic sealing.

In the above-described spout, when a thick portion is provided, it is preferable that the thick portion is formed by adding a thickened portion having an arc-shaped cross section to the tapered surface. With this configuration, the thick portion does not protrude too much in the outer diameter direction of the pull ring, so that the mold is easy to pull out, in other words, the thick portion is provided without significantly reducing the ease of removal of the mold. Can be reinforced.

The material used for the spout of the present invention is not particularly limited. For example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDP)
E) and polypropylene (PP).

[0013]

Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic sectional view showing a spout 11 according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the spout 11, and FIG. 3 is a schematic sectional view showing a column and a pull ring provided in the spout. , FIGS. 4A and 4B respectively show A-
FIG. 5 is a schematic plan view of the pull ring and the column, as viewed in the direction of the arrow A, in the direction of the arrow BB. The spout 11 has a cylindrical nozzle portion 11a, a flange 11b at the root thereof, and a nozzle portion 1a.
A shielding portion 11c for closing 1a, an opening groove 11d provided so that a part of the shielding portion 11c can be easily opened, and a region connected to the region surrounded by the opening groove 11d via a support 11e. And a pull ring 11f.

The pull ring 11f has a circular shape when viewed from the top as a whole and, as can be clearly seen from FIG. 4, expands from the end on the side of the shield toward the end on the opposite side. The tapered surface 13 has a diameter. The tapered surface 13 is provided for facilitating removal of the mold at the portion where the pull ring 11f is formed. The region (height h) where the tapered surface 13 is formed is preferably as large as possible because the inclination angle of the tapered surface 13 can be reduced and the mold can be easily pulled out. It is preferable to set a region from the end to a position exceeding 2/3 of the total height H of the pull ring (that is, h ≧ H × 2/3).

Further, as can be clearly understood from FIGS.
At a portion of the pull ring 11f farthest from the support portion 11e, a thick portion 14 having a larger sectional area than other portions is formed. The thick portion 14 is formed in a form in which a thickened portion 15 having an arc-shaped cross section is added to the tapered surface 13, whereby the thick portion 14 does not protrude much in the outer diameter direction of the pull ring 11 f, and therefore, We are trying not to reduce the ease with which the mold comes off. This thick portion 14 is provided to reinforce a welded portion formed by injection molding, and thereby prevents the pull ring 11f from being broken when pulling the pull ring 11f to open the spout. it can. Generally, pull ring 11f
Since the rate at which the strength of the welded portion is reduced as compared with the other portions is extremely small, the rate of reinforcement with the thick portion 14 may be small. Therefore, the cross-sectional area of the thick portion 14 is
What is necessary is just to set about 20% or more larger than the cross-sectional area of another part. The circumferential length L of the thick portion 14 may be determined so as to cover and reinforce the weld portion even if the position of the weld portion varies.
It may be about 5 mm.

As can be clearly seen from FIG.
The outer peripheral surface 17 of a part of the circumference of 1f and connected to the column 11e is cut inward as compared with the outer peripheral surface of the other part, whereby bending deformation can be easily performed on this part. Is formed. By forming the thin portion 18, the pull ring 11f can be easily deformed from a circle shown by a solid line in FIG. 5 to an ellipse shown by a two-dot chain line 19, and the mold can be easily pulled out. The shape of the thin portion 18 is not limited to the embodiment shown in the drawings, and may be appropriately changed as long as the pull ring 11f can be easily deformed into an elliptical shape. The inner surface may be inclined and a part of the pull ring 11f may be thinned.

FIGS. 6 and 7 illustrate a mold for forming the spout 11 having the above-described structure and an operation of removing the mold. The mold generally designated by reference numeral 20 forms a molding space 21 having the same shape as the shape of the spout to be molded, and is constituted by a plurality of molds so that the molded spout can be taken out. . That is, the mold 20 includes a mold (slide cavity) 23 that can be opened and closed to the left and right, and molds (upper cores) 24 and 25 for molding the upper surface of the shield of the spout, the inner surface of the nozzle, the pull ring, and the like. And a mold (lower core) 26 for molding the lower surface of the shielding portion, a mold (stripper plate) 27, and the like.
A sprue 28 for introducing a molten resin into the sprue is formed.

After molding the spout 11 with this mold 20,
To take out the spout 11, as shown in FIG.
First, the central upper core 24 (see FIG. 6) is pulled out upward. Next, as shown in FIG.
The upper core 25 having the outer surface f is pulled upward. At this time, the pull ring 11f is obliquely inclined and deformed into an elliptical shape when viewed from a plane, and comes out of the recess 30 on the inner surface of the upper core 25. As mentioned above,
The pull ring 11f has a thin portion 18 on the support 11e and can be easily deformed into an elliptical shape. Therefore, when the upper core 25 is pulled upward, the pull ring 11f can be easily deformed into an elliptical shape, and the upper core 25 can be easily pulled out. In other words, when pulling out the upper core 25, a large tensile force does not act on the pull ring 11f or the support portion 11e, so that the opening groove 11d at the base of the support portion 11e is not broken and the portion is deformed. It does not change or change the physical properties.

The spout 11 formed as described above is
It is attached to the container by an ultrasonic seal as before. Ultrasonic vibration is applied to the spout 11 at the time of this ultrasonic sealing. However, since a large tensile force does not act on the opening groove 11d at the base of the support 11e in the molding process, a pinhole is formed. Will not occur. Thus, even when ultrasonic sealing is performed under severe conditions such as low temperature, good sealing can be performed without generating pinholes. At the time of opening, since the thick portion 14 is formed on the pull ring 11f, breakage does not occur, and the opening can always be satisfactorily opened.

[0020]

As described above, the present invention has the effect of preventing the breakage when pulling and opening the pull ring by forming the thick part at the portion farthest from the pillar portion of the pull ring and reinforcing it. Have.

Further, according to the present invention, by forming a thin portion on the circumference of the pull ring to facilitate bending deformation, the pull ring can be easily elliptical when the mold located outside the pull ring is pulled out. It can be deformed into a shape and the mold can be easily pulled out, which can reduce the tensile force acting on the base of the column when the mold is pulled out, and breakage of the opening groove that may occur in the molding process In addition, there is an effect that it is possible to prevent the occurrence of pinholes that may occur when the injection port is ultrasonically sealed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a spout according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a spout 11 in FIG.

FIG. 3 is a schematic cross-sectional view showing a pillar portion and a pull ring provided at the spout shown in FIG.

FIGS. 4 (a) and (b) are cross-sectional views taken along arrows AA and BB in FIG. 3, respectively.

FIG. 5 is a schematic plan view of a pull ring and a support portion.

FIG. 6 is a schematic sectional view showing a mold for molding the spout shown in FIG. 1;

FIGS. 7A and 7B are schematic cross-sectional views showing an operation of removing a mold.

FIG. 8 is a schematic perspective view showing a container provided with a spout.

FIG. 9 is a schematic sectional view of a conventional spout.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Injection port 11a Nozzle part 11b Flange 11c Shielding part 11d Opening groove 11e Support part 11f Pull ring 13 Tapered surface 14 Thick part 15 Thickening part 18 Thin part 20 Mold 25 Mold (upper core)

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuya Nozaki 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Kenichi Endo 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F-term (reference) 3E084 AA12 AA34 AB02 BA03 CA01 CB01 CB04 DA01 EA04 EB01 EB03 EB04 EC03 FA09 GB08 GB17 HD01 KB01 LA03 LA07 LA17 LB02 LB05 LB07 LD01

Claims (4)

[Claims] 1. A cylindrical nozzle portion, a shielding portion formed with an opening groove for closing a bottom portion of the nozzle portion and easily opening the nozzle portion, and a pillar portion in a region of the shielding portion to be opened through a pillar portion. A spout provided with a connected pull ring, wherein a thick portion having a larger cross-sectional area than other portions is provided at a portion of the pull ring farthest from the column. 2. A cylindrical nozzle portion, a shielding portion formed with an opening groove so as to close the bottom portion of the nozzle portion and to be easily opened, and a column portion to be opened in the shielding portion through a support portion. A spout provided with a connected pull ring, wherein a thin portion for facilitating bending deformation is provided on a part of the circumference of the pull ring. 3. A taper for increasing the diameter of the outer peripheral surface of the prilling from an end on the shield side to a position exceeding 2/3 of the total height of the pull ring from the end on the shield side to the opposite end. The spout according to claim 1, wherein the spout is a surface. 4. The note according to claim 3, wherein a thick portion having a form in which a thickened portion having an arc-shaped cross section is added to the tapered surface is provided at a portion of the pull ring farthest from the support portion. exit.