JP6458544B2 - Spout - Google Patents

Description

  The present invention relates to a cap of a container for storing liquid or the like, and includes a plug main body having a flange and having a fitting protrusion on the outer periphery, and a spout that can be closed by fitting the inner surface with the plug main body. More particularly, the present invention relates to a plug that is unlikely to leak.

Conventionally, a packaging container for storing a liquid or the like, which is formed by forming a multilayer sheet into a bag shape, has been used in a box like a back-in box or used alone.
Since these containers are formed with a sheet as a base material, they are highly flexible containers with high storage efficiency compared to the storage capacity.
These containers have been manufactured by molding sheets, fusing a spout having a hole at one end and a fusing flange there.
A spout body or an adapter for inserting and stopping a fitting projection or ring on the inner surface of the spout, or the outer surface, or both the inner surface and the outer surface of such a spout has been used.

For example, in Patent Document 1,
A lower fitting projection and an upper side that fit with the fitting projection at the tip of the opening of the plug having a fitting projection on the outer diameter of the peripheral wall cylinder attached to the plastic bag filled with the liquid contents An adapter for a back-in box having an adapter peripheral wall cylinder made of a fitting projection, and a cap attached to the tip of the adapter peripheral wall cylinder,
Two tongue-shaped plates that prevent the film of the plastic bag from blocking the plug while the upper fitting projection is fitted to the upper end rib of the plug on the inside of the peripheral wall cylinder of the adapter are cross-shaped. A flow passage securing member having a joint structure at four locations at the upper end is provided at a substantially central position in the vertical direction on the inner side of the peripheral wall cylinder, and the lower fitting protrusion is provided on the mouth plug. When fitted to the upper end rib, it is stored in the storage box and can be stored and distributed. When the upper fitting protrusion is fitted to the upper end rib of the plug, the lower end of the flow path securing member is opened. We have proposed an adapter for back-in-box that protrudes from the lower surface of the flange part of the stopper.

  In the case of such a back-in-box adapter, the upper fitting protrusion is only fitted to the upper end rib of the plug on the inner side of the peripheral wall cylinder, so it is easy to cause a crease due to the fitting. There was a risk of leaking.

In Patent Document 2,
A spout spout composed of a spigot body, a cap for opening and closing, and a plunger, the spigot main body comprising a mounting portion that fits into the container main body spigot, a vertical extraction cylinder, and an extraction cylinder It is connected to the extraction tube at a right angle to communicate with the extraction tube, and is composed of a horizontal connection tube that connects the extraction tube and the mounting portion. The extraction tube has an external thread on the outer peripheral surface, and has a lower end surface of the extraction tube. The angle formed by the inner peripheral surface of the extraction cylinder is 90 ° or less, and the cap for opening and closing is composed of a cap top plate and a cap peripheral wall, and the cap top plate is suspended inward and is fitted to the upper end of the plunger. The inner circumferential surface of the cap peripheral wall is provided with a female screw that is screwed with the male screw on the outer peripheral surface of the extraction cylinder, and the plunger is fitted to the upper end to fit the cap inner ring. It has a joint and rotates together with the cap for opening and closing, and the extraction It can slide up and down, and the lower end of the plunger is closed at the center, and the angle between the lower end of the plunger and the side of the plunger is an acute angle, and the radius of the roundness is 0.3 mm In the following, a pouring spout is proposed in which the lower end of the plunger does not protrude from the lower end of the extraction cylinder.

In this proposal, the fitting in the mounting part is poured out by fitting it into the inner periphery of the opening of the container main body plug and the outer periphery of the opening of the container main body plug. It is said to have a flange shape with an occlusal cylinder for firmly fixing the mouth plug.
Although it is fitted from the inside and outside of the spout plug, these inner sealing rings and occlusal cylinders have a problem that they are easily deformed in the direction of escaping by fitting. Furthermore, when trying to make the fitting particularly strong, the fitting protrusion is deformed and it is not possible to surely prevent liquid leakage, and even if the stoppering force is increased, the removal force becomes small, etc. There was a problem.

Japanese Patent No. 5151335 Japanese Patent No. 5326857

  Therefore, in view of the above problems, it is an object of the present invention to obtain a plug that can ensure liquid stop even if the fitting strength of the main fitting portion is increased and deformed.

The plug of claim 1 of the present invention is:
In a spigot comprising: a spigot body having a fitting projection provided in a circumferential shape at an outer peripheral position of a certain depth from the lower end of the flange; and a spout that can be closed by fitting the inner face with the spigot body ,
The spout is characterized in that the fitting inner surface of the spout is provided with at least a fitting portion having a minimum diameter and a second fitting portion having a second smallest diameter spaced downward from the fitting portion.

  In the plug according to claim 2 of the present invention, the length of the protrusion on the outer periphery of the plug body is sufficiently longer than the length from the lower end of the fitting portion having the smallest diameter contacting the fitting inner surface of the spout to the upper end of the second fitting portion. The plug according to claim 1, wherein the plug is long.

  In the plug according to claim 3 of the present invention, the fitting inner surface of the spout that is fitted to the fitting protrusion on the outer periphery of the plug body is larger than the cylindrical inner surface that abuts against the plug main body largest protrusion, and the cylindrical inner surface. The plug according to claim 1, wherein the plug has an inclined surface inclined to the inner diameter side surface.

  The spigot according to claim 4 of the present invention is characterized in that the cylindrical inner surface of the spout fitted to the plug main body maximum protrusion is an inclined surface having a gradient of 0.5 degrees or more and 2 degrees or less. 3. The plug according to 3.

  The spigot according to claim 5 of the present invention is characterized in that a corner R of 0.5 mm or more is provided at the tip of the spout fitting protrusion that fits into the plug main body maximum protrusion. It is a mouth plug as described in.

When the plug body of the present invention is inserted into the spout, even if the tip of the fitting projection on the side of the plug body is deformed, there is a second fitting portion, so that it is possible to stop liquid.
Further, since the risk of liquid leakage can be reduced without tightly fitting the spout, there is an effect that stable workability can be obtained without changing the plugging force and the removal force.

It is the longitudinal cross-sectional view which showed the state in which the plug main body and the spout are fitting (biting) with the plug in the embodiment of the present invention. The longitudinal cross-section which shows the fitting process of the 1st step which inserted the fitting part of the minimum diameter of the fitting inner surface of a spout to the front of the fitting projection part of the inserted plug main body outer periphery in the plug in embodiment of this invention FIG. The longitudinal section which shows the fitting process of the 2nd step in which the fitting projection part of the inserted mouthpiece main body outer periphery passes through the fitting part of the minimum diameter of the fitting inner surface of a spout by the mouthpiece in embodiment of this invention FIG. It is a longitudinal cross-sectional view which shows the process in which the fitting protrusion part of the inserted plug stopper main body periphery passes the 2nd smallest fitting part of the fitting inner surface of a spout with the stopper in embodiment of this invention. It is a longitudinal cross-sectional view which shows the state in which the fitting protrusion part of the plug main body outer periphery passed through the fitting part of the spout and was bitten by the plug in the embodiment of the present invention. In the plug in the embodiment of the present invention, in the second stage fitting process in which the fitting projection portion on the outer periphery of the plug body inserted through the smallest diameter fitting portion of the fitting inner surface of the spout It is a longitudinal cross-sectional view which shows the process of passing through the fitting part of a spout and crushing, crushing the front-end | tip of the fitting protrusion part of a stopper main body outer periphery.

Hereinafter, the form for implementing the stopper of this invention is demonstrated in detail using figures.
FIG. 1 is a longitudinal cross-sectional view showing a state in which the plug body and the spout are engaged with each other in the embodiment of the present invention.
The plug of the present invention is a plug used for a bag-like container made by fusing the periphery of a film 9 made of a thermoplastic resin at least on the inner surface.
A hole is made in one part of the bag, and the spout 1 is fused there.

The spout 1 is usually provided so that only the tip protrudes from the inside, and has a spout flange 11 on the side surface, and is fused to the film 9 constituting the bag with the flange. Therefore, the spout 1 is manufactured by injection molding of a thermoplastic resin.
A large corner R is provided at the upper end of the inner diameter of the spout, and the corner R is designed to be 0.5 mm or more so that the plug body 2 can be easily inserted. This corner R has the purpose of facilitating the insertion of the plug body, and the purpose of making the plug body fitting protrusion 22 not hurt when it gets over the plug body fitting protrusion 22 so that it can be resealed. is there. If it is less than 0.5 mm, there is a problem that damage to the plug body fitting protrusion 22 becomes so large that it is difficult to reseal, and 0.8 to 2 mm is preferable.

The plug body 2 is used by being inserted into the opening of the spout.
The plug main body 2 has a screw part to be screwed or a fitting part for plugging in order to fit the cap upward. Further, it has a function of a backflow prevention valve and a chucking function for connection with an automatic suction device.
The lower part is used by being plugged into the spout 1.
A plug body flange 21 is provided between the upper side and the lower side so that the plug body 2 can be easily removed and plugged.

The spout 1 and the plug body 2 are fitted with a large spout fitting protrusion 12 provided at the upper end portion of the inner diameter of the spout 1 and a plug body fitting protrusion 22 provided on the lower outer periphery of the plug body 2. Are combined.
The plug body fitting protrusion 22 has an inclined surface on the lower side and is a protrusion having a two-stage shape.
Moreover, the cylindrical inner surface of the spout 1 on the lower side of the fitting protrusion 12 has an inclined surface having a gradient in which the inner diameter increases toward the lower side, and the gradient is provided at 0.5 degrees to 2 degrees. .
This gradient has the purpose of facilitating the formation of the spout, smoothing the fitting with the plug body 2 and minimizing deformation and breakage so that the plug body fitting protrusion 22 can be resealed. It is provided so that it can be securely stopped. If the angle is less than 0.5 degrees, deformation and breakage of the plug main body fitting protrusion 22 become excessively large, and there is a problem that it is difficult to reseal. Even with the deformation of the liquid, there is a problem that the liquid stop cannot be reliably performed.

FIG. 2 shows the first step of inserting the spigot body 2 into the spout 1 by first inserting the fitting portion of the smallest diameter of the fitting inner surface of the spout up to the front of the fitting projection portion on the outer periphery of the inserted spout body. It is a longitudinal cross-sectional view which shows the fitting process of a step.
A lower R projection 23 having a large curvature is provided below the fitting projection 22 of the plug body 2. Since the R protrusion 23 has a large R and is a low protrusion, it can be easily overcome.
Therefore, when the plug main body 2 is inserted into the spout 1, the spout fitting protrusion 12 once gets over the R protrusion 23 and fits between the plug main body fitting protrusion 22 and the R protrusion 23.

FIG. 3 is a longitudinal sectional view showing a second stage fitting process in which the inserted plug main body fitting projection 22 passes through the spout fitting projection 12 having the smallest diameter provided on the fitting inner surface of the spout 1. It is.
When the plug body 2 is further inserted into the spout 1 from the first stage fitting process of FIG. 2, the plug body fitting protrusion 22 and the spout fitting protrusion 12 are pressed against each other as shown in FIG. 1 The diameter of the tip is greatly widened, the outer diameter below the plug body 2 is compressed and contracted, and the plug body fitting protrusion 22 rides on the spout fitting protrusion 12.

Further, when the plug main body 2 is inserted, the maximum protrusion 221 of the plug main body fitting protrusion 22 rides on the spout fitting protrusion 12 as shown in FIG.
Since a considerably large force is applied when riding, there is a possibility that the maximum protrusion 221 portion of the plug main body fitting protrusion 22 may be plastically deformed upward as shown in FIG.
Of course, since the tip of the spout has a large corner R shape, the maximum protrusion portion of the plug body fitting protrusion 22 does not completely collapse. Depending on the plugging speed, temperature, and material, the maximum protrusion of the plug body protrusion is somewhat plastically deformed upward.
Of course, in order to reduce the amount of plastic deformation as much as possible, it is needless to say that the large corner R-shaped portion at the tip of the inner diameter of the spout 1 should be sufficiently polished and made slippery.

FIG. 4A shows a state in which the maximum protrusion 221 of the spigot body fitting protrusion 22 riding on the spout fitting protrusion 12 is further inserted into the spout.
The plug body fitting protrusion length 222 of the plug body fitting protrusion 22 is changed from the lower end of the spout fitting protrusion 12 having the smallest diameter contacting the fitting inner surface of the spout to the upper end of the second fitting portion 13 having the second smallest diameter. The spout fitting length 14 is sufficiently longer.
Therefore, when the largest protrusion 221 of the plug body fitting protrusion 22 rides on the spout fitting protrusion 12, the second fitting portion 13 of the spout does not contact the stopper body or does not contact strongly. Thus, the plug main body fitting protrusion length 222 is entered.
For this reason, if there is no damage to the maximum protrusion 221 in the second fitting portion 13, the maximum protrusion 221 contacts the lower spout fitting protrusion 141 of the lower portion of the fitting protrusion of the spout 1 as shown in FIG. 4B. Thus, the liquid can be stopped by the first fitting portion 10.

In the present invention, the plug body fitting protrusion length 222 is sufficiently longer than the spout fitting length 14.
Therefore, even if the damage to the maximum protrusion 221 occurs, the second fitting part 13 enters the range of the plug body fitting protrusion 22 with almost no damage. The second fitting portion 13 in the state comes into contact with the plug body fitting projection 22 and can be liquid-stopped.
This means that there is a high possibility of damage to the maximum protrusion 221 when the plug body and spout are repeatedly inserted and pierced, such as when the plug body 2 once removed is reinserted into the spout 1.
However, if the plug is made as in the present invention, even if it is repeatedly pierced, a major problem such as liquid leakage due to resealing does not occur.

The plug of the present invention can be used in any shape as long as the inner surface of the film forming bag to be used can be fused, and is mainly used for liquid bags that are sucked and discharged by a machine such as a back-in box. Used as a plug for use.
Molding resin used for spout is olefin resin such as high pressure method low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer Coalescence etc. can be used.
Usually, these resins are selected according to the fusion layer of the film to which these resins are fused, the environmental stress cracking resistance to the contents, the compatibility with the plug body, and the like, and manufactured by an injection molding machine or a compression molding machine.

  The molding resin used for the plug body is desirably a resin different from the spout from the viewpoint of slidability. For example, high pressure method low density polyethylene resin, linear low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, isotactic polypropylene resin, synocta polypropylene resin, poly 1-butene resin, poly-methyl-1 -Various olefin resins such as random or block copolymers of α-olefins such as pentene resin, ethylene-, propylene-, 1-butene-, 4-methyl-1-pentene, preferably various polyethylene and polypropylene It is molded by injection molding or compression molding using the like.

The plug of the present invention is as described above, and since a conventional automatic paper container manufacturing machine for a bag with a plug can be used as it is, the startup cost can be manufactured in the same manner as a container such as a normal back-in box.
In particular, since the plug of the present invention is provided with the second fitting portion 13, the stopper can be reliably stopped even when the tip of the plug body fitting protrusion is bent, deformed or scratched. .
Moreover, in the spigot of the present invention, it is not necessary to make the inside of the spout smaller to make the fitting tight and to greatly increase the thickness of the spout, so there is no increase in the amount of resin, and the plugging force is This can be achieved without increasing the size and without reducing the removal force. For this reason, there is a great merit that liquid stoppage can be surely achieved without changing workability and feel of use.

1 ... Spout 10 ... First fitting part 11 ... Spout flange 12 ... Spout Fitting projection 13 ··········· Second fitting portion 14 ··················································································· ························································································. Maximum protrusion 222 ··· Plug body fitting protrusion length 23 ... R protrusion 9 ... Film

Claims (5)

In a spigot comprising: a spigot body having a fitting projection provided in a circumferential shape at an outer peripheral position of a certain depth from the lower end of the flange; and a spout that can be closed by fitting the inner face with the spigot body ,
A spigot characterized in that a fitting portion having at least a minimum diameter and a second fitting portion having a second smallest diameter separated downward from the fitting inner surface of the spout are provided.   The length of the spigot fitting protrusion is sufficiently longer than the length from the lower end of the spout fitting protrusion having the smallest diameter contacting the fitting inner surface of the spout to the upper end of the second fitting portion. The mouth plug according to 1.   The fitting inner surface of the spout that fits to the fitting protrusion on the outer periphery of the plug body has a cylindrical inner surface that abuts against the largest protrusion of the stopper body, and an inclined surface that is inclined from the cylindrical inner surface to a larger inner diameter side surface. The spigot according to claim 1 or 2, characterized in.   The spigot according to claim 3, wherein the cylindrical inner surface of the spout fitted to the plug main body maximum protrusion is an inclined surface having a gradient of 0.5 degrees or more and 2 degrees or less.   The plug according to any one of claims 1 to 4, wherein an angle R of 0.5 mm or more is provided at a tip of a spout fitting protrusion of the spout that is fitted to the plug main body maximum protrusion.

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