JP6903905B2 - Liquid dripping prevention cap and its manufacturing method - Google Patents

Description

The present invention is a cap that is used by being fitted in a flexible container for storing a high-viscosity or medium-viscosity liquid to prevent dripping after the contents are poured out, and is integrally provided. Regarding the molded cap and its manufacturing method.

Liquid seasonings such as dressings, sauces and ketchups, edible oils such as olive oil, high-viscosity liquid foods such as honey, toiletries such as shampoos, rinses and conditioners, and liquid detergents for kitchens, etc. After pouring out from the container to be stored, the contents continued to come out from the spout as if pulling a string, and there was a problem that the liquid could not be drained. If the liquid did not run out, the contents would hang around the container and become dirty, causing hygienic problems such as mold growth and easy growth of pests.

By the way, there is a method of forcibly stopping the contents to be used for dripping by providing a valve with a slit at the tip of the spout so that the liquid can easily run out.
However, the spout having such a slit valve is generally made of a highly elastic material, and is generally simply sandwiched between the spout and the holding member and fixed.
However, if the mouthpiece portion provided with such a slit valve is provided, there is a problem that the valve is easily disengaged, the number of parts is large, the assembly process is troublesome, and the price is high. Further, during long-term storage of the discharge container, the cut surfaces in contact with the slits may block each other, the slits may not open during use, and the discharge container may not be usable.

In contrast to the above, Patent Document 1 is a content discharge container in which a slit valve is attached to the mouth cylinder portion of the container via a cap.
The slit valve has an orifice forming wall in which the outer surface is a spherical recess, a slit whose end is surrounded by a reinforcing rib is engraved in the center, and a flap is formed.
The cap is composed of a cap base to which a slit valve is attached and screwed to a container mouth tube portion, and a cover to be fitted on the cap base.
The cover has a pressing surface and a protruding portion on the lower surface thereof that engage with the peripheral edge of the orifice forming wall, and engages with the orifice forming wall when the covering is closed to increase the degree of curvature of the orifice forming wall surface. , Proposes a discharge container cap with a slit valve attached, which is characterized by opening a slit.

This cap engages with the orifice forming wall at the protruding part on the lower surface of the cover, and is stored with the slit open, so that the cut surfaces in contact with the slit are blocked even during long-term storage of the discharge container. Is prevented from occurring. However, this cap is composed of a slit valve molded from silicone rubber, elastomer, and soft synthetic resin, a cover, and a cap base, and since they are not made integrally, an assembly process is required. In addition to being expensive, there were problems such as loss, forgetting to close it, and getting dirty.

Further, in Patent Document 2, a cap substrate, a slit valve attached to an opening of the cap substrate, which opens outward when the internal pressure is higher than the atmospheric pressure and closes by an elastic force when the internal pressure is equal to the atmospheric pressure, and a cap substrate. With a lid that opens and closes the opening of the
The lid has an inverted convex push-in portion formed on the inner surface thereof.
We propose a cap with a slit valve, which is characterized in that when the lid is closed, the push-in portion abuts only on the center side from the slit end of the slit valve and pushes the slit valve slightly inward. There is.

This cap is also composed of a cap base, a lid body, and a slit valve, and even if the cap base and the lid body are integrated with a hinge, the slit valve is a molded body molded of an elastic soft synthetic resin material. , It is composed of separate parts and needs to be assembled manually. Therefore, there is a problem that the price coming from the assembly process becomes high.

Japanese Patent No. 374508 Japanese Unexamined Patent Publication No. 2016-50007

Therefore, even though the slit valve is provided, the spout main body and the slit valve are integrated into the spout so that the contents can be instantly threaded so that the contents do not drip after pouring. It is an object of the present invention to obtain a cap for stopping and preventing liquid dripping.

The liquid dripping prevention cap of the present invention is
It consists of a spout body that is attached to the mouth of a flexible container and a lid that covers the spout of the spout body and can be opened and closed.
Inside the spout of the spout body, a liquid check valve with a slit that can be closed instantly after pouring out the contents is integrally provided.
The tip of the insertion protrusion provided on the inside of the lid has a cross section larger than the cross section on the root side thereof , and has an insertion shaft narrower on the root side than the tip of the insertion protrusion.
With a liquid dripping prevention cap characterized in that when the lid is closed, the tip of the insertion protrusion having a large cross section comes to a position where it penetrates the slit and is locked by contacting the end face of the slit. is there.

Since the liquid stop valve having a slit and the spout main body are integrated in the liquid stop valve of the present invention, it is inexpensive, there is no concern that the liquid stop valve will come off, and leakage from around the liquid stop valve will occur. It does not occur and is highly airtight.
Further, when the pouring is stopped, the liquid stop valve closes instantly and stringing does not occur, so that the pouring outlet and the lid are less likely to be soiled.

It is a vertical cross-sectional view of the liquid dripping prevention cap of this invention, and is the enlarged perspective view of the liquid stop valve part. It is a partially enlarged sectional view in the vicinity of the liquid stop valve which shows the process of closing a lid part with the liquid dripping prevention cap of this invention. It is a vertical cross-sectional view of the liquid dripping prevention cap of the present invention in a state where a lid portion is opened, and a vertical cross-sectional view in a state where the contents are poured out. It is an enlarged cross-sectional view which shows the other embodiment of the liquid stop valve in the liquid dripping prevention cap of this invention, and the other embodiment of the insertion protrusion of a lid part. It is sectional drawing which shows an example of the injection molding die of the liquid dripping prevention cap of this invention.

Hereinafter, an example of an embodiment of the liquid dripping prevention cap of the present invention will be described in detail with reference to the drawings.
The liquid dripping prevention cap of the present invention is a cap used for a flexible container.
That is, it is used for a container in which the contents are extruded by pushing the container body with the spout facing downward.
FIG. 1-1 is a vertical cross-sectional view of the liquid dripping prevention cap of the present invention screwed into the container mouth, and is carried out in a liquid dripping prevention cap of a type that is integrally molded with the spout main body with the lid as a hinge cap. This is a morphological example. The liquid dripping prevention cap 2 is screwed into the mouth 11 of the container body 1. Of course, it may be a plug-type fitting.
The liquid dripping prevention cap is composed of a liquid stop valve 21, a spout main body 22, and a lid portion 23, and is manufactured so that the liquid stop valve 21 and the spout main body 22 are integrated by insert molding. There is.

The spout main body 22 is composed of a spout top plate 221 and a spout side wall 222 extending downward from the peripheral edge of the spout top plate 221.
The pouring outlet top plate 221 has a pouring cylinder 2211 protruding from the center of the top plate, and a liquid stop valve 21 is formed inside the pouring cylinder 2211.
Further, the inside of the tip of the dispensing cylinder 2211 has a curved surface having a large curvature, so that even if the lid inner ring 2311 of the lid portion 23 is inserted in a circular motion from a slightly oblique angle, it can be smoothly inserted. It has become.

Inside the spout outlet side wall 222, there is an internal screw 2221 that is screwed into the mouth of the spout container. Of course, if a fitting projection for plugging is provided instead of the screw for screwing into the mouth of the container body 1, a fitting ring for plugging or the like is provided on the spout side wall 222.
Then, it is preferable to provide a knurl 2222 on the outside of the spout side wall 222 to facilitate tightening of the screw to be screwed.
Further, it is preferable to provide an inner ring 2212 or a contact ring 2213 inside the spout top plate 221 so that it can be easily inserted into the container mouth to ensure high sealing performance.

FIG. 1-2 is an external perspective view of the liquid stop valve 21 in the embodiment. The liquid stop valve 21 is located on the top plate of the pouring outlet main body 22, and is fixed to the inside of the pouring cylinder 2211 protruding from the center of the top plate by insert molding. In this embodiment, the check valve 21 forms a plurality of check valve bodies 212 divided by two slits 211 intersecting at the center.
The liquid stop valve 21 is molded from a resin having rubber elasticity, such as natural rubber, silicone rubber, or a polyester-based elastomer, which does not have a bending habit even when bent.
The check valve 21 easily moves due to the internal pressure, and if a large pressure is applied, the check valve 21 opens wider by that amount, and a large amount of contents can be poured out in a short time.

As shown in FIG. 1-1, the lid portion 23 includes a lid top plate 231 and a lid side wall 232 hanging from the peripheral edge of the lid top plate.
Inside the center of the lid top plate 231 is a cylindrical lid inner ring 2311 that can be inserted into the tip of the dispensing cylinder 2211.
Further, the insertion protrusion 2312 is located in the center of the lid inner ring 2311 and protrudes below the tip of the lid inner ring 2311.
In this figure, the lid portion 23 is connected to the spout main body 22 by a hinge and is integrated, but a male screw is further provided on the outside of the spout side wall 222 or a male screw is provided on the outside of the spout cylinder and screwed therein. The female screw to be fitted may be provided inside the lid so as to be removable.

FIG. 2 is a partially enlarged cross-sectional view of the vicinity of the liquid stop valve showing the step of closing the lid portion 23 with the liquid dripping prevention cap of the present invention.
FIG. 2-1 shows a state before the lid portion 23 is completely closed, and the insertion protrusion 2312 has not yet started to push the slit 211 of the liquid stop valve body 212 open. At this point, the liquid stop valve 21 itself is closed, but the lid inner ring 2311 has already begun to be inserted into the inside of the dispensing cylinder 2211, so that the liquid stop state is ensured.
In this way, before the insertion protrusion 2312 reaches the liquid stop valve body 212, the lid inner ring 2311 is inserted into the dispensing cylinder 2211 to seal the liquid stop valve 2312. Even if it is expanded and opened, there is no risk that the contents will leak to the outside of the spout main body 22.

FIG. 2-2 shows a state in which the lid portion 23 is completely closed and the insertion protrusion 2312 pushes out the slit 211 of the liquid stop valve 21.
When the insertion protrusion 2312 expands the slit 211 of the check valve 21, a gap is created between the adjacent check valve bodies 212, and even if the contents are about to solidify without pouring for a long time, the adjacent liquids are formed. The problem that the check valve body 212 and the liquid stop valve body 212 stick to each other is unlikely to occur.
Further, in this state, the lid inner ring 2311 is inserted into the inner surface of the dispensing cylinder 2211 and sealed, so that the volatile components of the contents are hard to come off.
A fitting ring made of an undercut is provided at the tip of the lid inner ring 2311, a recess is provided inside the pouring cylinder 2211, and a fitting portion is formed between the lid side wall 232 and the pouring outlet side wall 222 to form a lid portion. It may also be used in combination with making it difficult for the 23 to come off from the spout main body 22 so that the fitted state can be easily maintained.

FIG. 3-1 is a vertical cross-sectional view of the liquid dripping prevention cap of the present invention in a state where the lid portion 23 is opened.
When the lid portion 23 is opened, the insertion protrusion 2312 is separated from the liquid stop valve 21, and the liquid stop valve 21 is closed. At this point, the check valve 21 is not open, so the contents are not poured out.
The liquid check valve 21 can be opened when the internal pressure is applied by pressing from the outside of the pouring container body, and can be closed when the internal pressure is lowered.
However, the slit 211 of the check valve 21 does not need to be completely closed. If the gap of the slit 211 of the check valve 21 is very narrow, the contents can stay inside the check valve due to surface tension. Therefore, it is possible to cut the string of the viscous content to drain the liquid.

FIG. 3-2 is a vertical cross-sectional view of the liquid dripping prevention cap of the present invention in a state where the contents are poured out.
When the body of the container body 1 is pressed and internal pressure is applied as shown in this figure, the liquid check valve 21 opens and the contents are poured out. However, when the internal pressure drops, the liquid stop valve 21 closes and the state shown in FIG. 3-1 is reached. Therefore, even a highly viscous liquid content that does not easily run out can easily run out and the pouring cylinder 2211. Is hard to get dirty depending on the contents.

FIG. 4 is an enlarged cross-sectional view showing another embodiment of the liquid stop valve 21 in the liquid dripping prevention cap of the present invention and another embodiment of the insertion protrusion of the lid portion 23.
FIG. 4-1 is an example of an embodiment in which tubular seats are provided above and below the peripheral edge of the check valve 21 in parallel with the pouring direction. When the liquid check valve 21 is insert-molded, the tubular seats provided above and below the peripheral edge parallel to the pouring direction are covered so that the molding resin of the pouring cylinder 2211 wraps around the liquid stop valve 21. It can be fixed in a sealed state so that it will not come off.
The liquid stop valve 21 does not come off from the dispensing cylinder 2211 even if it is greatly deformed by the insertion protrusion. Further, the cut of the slit 211 spreads to the outer peripheral edge portion, and the liquid stop valve 21 is unlikely to break as if it were broken.

FIG. 4-2 is an example of an embodiment in which the tip of the insertion protrusion of the lid portion 23 has a cross section larger than the cross section on the root side thereof. When the lid of the insertion protrusion 2312 is closed, the tip of the insertion protrusion 23121 having a large cross section comes to a position where it penetrates the slit 211.
At this time, the narrowed insertion shaft 23122 on the root side is sandwiched by the narrowest slit 211, and the insertion protrusion tip 23121 having a large cross section at the tip of the insertion shaft 23122 abuts on the end surface of the slit 211 that has begun to expand from there. To lock.
Therefore, a force for closing the liquid stop valve 21 is likely to work, and the force makes it difficult to open the lid portion, and there is no possibility that the lid portion 23 is easily opened due to dropping or the like.
At this time, the lid portion 23 has a lid inner ring 2311, and the lid inner ring 2311 is inserted into the tip of the spout 2211, which also acts to prevent the lid inner ring from coming off, thereby sealing. Since the above is obtained, there is no risk of the contents leaking.

FIG. 5 is a cross-sectional view showing an example of an injection molding die of the liquid dripping prevention cap of the present invention.
As shown in this figure, the liquid stop valve 21 is sandwiched and fixed by the core side core and the cavity side core, and insert injection molding is performed. At the time of insert injection molding of the spout main body 22, the injection molding resin forming the spout main body 22 can be integrated by covering the peripheral edge of the liquid stop valve 21 so as to wrap around.
By insert molding in this way, the liquid check valve 21 can be manufactured integrally with the spout main body at the time of molding, so that the assembly work after molding is eliminated, and therefore, there is no assembly loss and the sealing performance is maintained high. At the same time, the manufacturing cost can be suppressed.

As described above, the check valve 21 can be manufactured integrally with the spout main body, but the slit 211 of the check valve 21 can also be machined by inserting a blade with a press after insert injection molding. Of course, it is also possible to make a slit before insert molding.
The liquid stop valve to be inserted can be manufactured by pre-molding a rubber sheet or an elastomer sheet and removing it by press molding.
Of course, in the case of the liquid check valve 21 having tubular seats on the upper and lower sides parallel to the pouring direction as shown in FIG. To do.
In that case as well, a slit may be made after the insert molding, or a slit may be made before the insert molding.

When the cap is a hinge cap, the liquid dripping prevention cap of the present invention uses polypropylene, ethylene / propylene random copolymer, ethylene / propylene block copolymer, or the like as the material of the spout body and the cap. use. However, when manufactured separately from the cap, the high-pressure method low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene / propylene random copolymer, and ethylene / propylene block copolymer weight Olefin resin alone such as coalesced or polymethylpentene, or crystalline polyolefin mixed with them, ionomer resin, polyoxymethylene, acrylonitrile / butadiene / styrene copolymer resin, acrylonitrile / styrene copolymer resin, high impact styrene Resin etc. can be used. However, it is preferable to use a resin different from that of the pouring container.
The liquid dripping prevention cap can be mass-produced by a general injection molding machine using an injection molding die, so that the productivity is high.

The liquid dripping prevention cap of the present invention is as described above, and can promote liquid dripping of contents having high viscosity or viscosity such as medium viscosity and prevent liquid dripping.
In manufacturing, a liquid stop valve can be inserted into an injection molding die, and injection molding can be performed integrally by insert molding. Therefore, only closing the cap after molding requires almost no assembly.
In particular, since the liquid check valve is integrated with the cap body, problems such as falling off inside the container do not occur, so that problems in terms of hygiene are unlikely to occur. In addition, there is no problem that the check valve falls off to the outside and is swallowed, or enters the device and causes a failure.
Further, since it can be manufactured by an ordinary injection molding machine, it has high productivity and can be mass-produced at low cost, and the merit of the present invention is high.

1 ・ ・ ・ ・ ・ ・ ・ ・ Container body 11 ・ ・ ・ ・ ・ ・ ・ Mouth 2 ・ ・ ・ ・ ・ ・ ・ ・ Liquid dripping prevention cap 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ Liquid stop valve 211 ・ ・ ・ ・ ・・ Slit 212 ・ ・ ・ ・ ・ ・ Liquid stop valve body 2121 ・ ・ ・ ・ ・ Thin-walled part 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Outlet 2212 ・ ・ ・ ・ ・ Inner ring 2213 ・ ・ ・ ・ ・ Contact ring 222 ・ ・ ・ ・ ・ ・ Cap side wall 2221 ・ ・ ・ ・ ・ Internal screw 2222 ・ ・ ・ ・ ・ Laurette 23 ・ ・ ・ ・ ・ ・ ・Lid 231 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Cover side wall 2321 ・ ・ ・ ・ ・ Eaves 24 ・ ・ ・ ・ ・ ・ ・ Hinge

Claims (7)

It consists of a spout body that is attached to the mouth of a flexible container and a lid that covers the spout of the spout body and can be opened and closed.
Inside the spout of the spout body, a liquid check valve with a slit that can be closed instantly after pouring out the contents is integrally provided.
The tip of the insertion protrusion provided on the inside of the lid has a cross section larger than the cross section on the root side thereof , and has an insertion shaft narrower on the root side than the tip of the insertion protrusion.
A liquid dripping prevention cap characterized in that when the lid portion is closed, the tip portion of the insertion protrusion having a large cross section comes to a position where it penetrates the slit and is in contact with the end face of the slit to be locked. The liquid dripping prevention cap according to claim 1, wherein an insertion protrusion is provided inside the lid, and when the lid is closed, the insertion protrusion inserts into the slit of the liquid stop valve and opens the slit. The liquid dripping prevention cap according to claim 1 or 2, wherein the lid portion and the spout main body are sealed at the time when the insertion protrusion is inserted into the slit of the liquid stop valve. The liquid dripping prevention cap according to claim 3, wherein an inner ring is provided on the lid portion, and the inner ring is inserted into the tip of the spout to obtain a sealing property. The liquid dripping prevention cap according to any one of claims 1 to 4, wherein tubular seats are provided on the peripheral edge of the liquid stop valve in parallel with the pouring direction. The liquid dripping prevention cap according to any one of claims 1 to 5, wherein the lid portion is integrated with the spout main body by a hinge. A method for manufacturing a liquid dripping prevention cap, which comprises inserting a liquid stop valve into a molding die of a spout main body to integrally manufacture the liquid dripping prevention cap according to claims 1 to 6.

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