JP6175856B2 - Check valve and container equipped with the check valve - Google Patents

Description

  The present invention is used in containers for storing liquids such as liquid seasonings, food oils, liquid sweeteners, and liquid cosmetics, and is attached to the mouth of the container, deformed to pressurize the contents of the container, and inside the spout It relates to a check valve set so that it can be dispensed only from

Liquid containers that contain liquid cosmetics such as lotions and lotions, food oils such as olive oil, and liquid seasonings such as wine vinegar should be prevented from deteriorating due to contamination from the outside as much as possible. It is requested to do.
For example, when the amount of contents stored in a tube container decreases, the elasticity of the container causes a force to return the shape after pouring, and it becomes easy to suck outside air. Therefore, a check valve is required particularly in a container for storing contents to be prevented from oxidation.

On the other hand, Document 1 has sufficient flexibility to deform corresponding to the pressing force and sufficient elasticity to automatically return to the undeformed state when the pressing force is removed, and the discharge orifice is An elastically deformable container comprising:
A self-sealing dispense valve that opens at a predetermined threshold pressure that is greater than the maximum head pressure in the container when the discharge orifice is directed downwards;
The dispensing valve is hermetically secured at the periphery to traverse the discharge orifice of the container, the dispensing valve having a central concave portion made of an elastic material;
The central elastic part is fixedly sealed so that the dispensing valve crosses the discharge orifice, and has a predetermined concave shape when no pressure is applied, and the dispensing valve is centered in the undeformed state of the container. When the elastic part is oriented with respect to the discharge orifice so that it is concave inward, the concave elastic part of the valve has a linear slit and when the dispensing valve increases above the threshold opening pressure, the leakage resistance A flexible package comprising a self-closing self-sealing dispensing valve with the ability to reverse from a sealed inwardly closed closed state to an unsealed outwardly convex open state .
However, the check valve of such a rubber packing is a mechanism in which a slit made of a straight line such as a cross or a straight line is deformed and discharged, so that sealing without maintaining the state of deformation of the slit is a slight deformation. Since no loosening is allowed, it is difficult to seal completely, and there is a problem that outside air gradually flows from the gaps in the slits.

JP 61-33927 A

  In view of the above problems, it is possible to securely seal with the addition of simple parts, and it is possible to prevent the inflow of air by ensuring the sealing performance, so that it does not deteriorate due to oxidation etc. and is an inexpensive check valve It is an object of the present invention to obtain the above.

The check valve according to claim 1 of the present invention is a check valve that is set to fit into a spout at the center of the mouth portion of the container body and to discharge only from the inside of the spout.
A planar pressure-receiving surface;
A shaft extending upward from the center of the pressure receiving surface, fitted into the spout from the outside, and having a reverse taper;
A check valve characterized by comprising a plurality of repulsive spring portions provided around the shaft so as to protrude upward from the pressure receiving surface and in pressure contact with the inner surface of the spout peripheral edge.

  The check valve according to claim 2 of the present invention is a check valve characterized in that a discharge window for discharging the contents from the pressure receiving side to the discharge side of the pressure receiving surface is provided on the pressure receiving surface.

  A check valve according to a third aspect of the present invention is a check valve characterized in that a protrusion is provided on the outlet side of the pressure receiving surface.

  The check valve according to claim 4 of the present invention is a check valve characterized in that the repulsion spring portion is made of a resin spring and is integrally formed with the pressure receiving surface by molding.

  A container according to a fifth aspect of the present invention is a container comprising the check valve according to the first to fourth aspects.

  Since the check valve of the present invention can be securely sealed, not only can it be used to store contents that are susceptible to oxidative degradation, but it can also be easily manufactured by injection molding using a single mold, so assembly is also included. Therefore, there is an effect that the productivity is high and it can be supplied at a low cost.

It is sectional drawing which showed the state which the valve closed in the container mouth vicinity using the check valve of this invention. It is a perspective view of the check valve simple substance of the present invention. It is the top view which looked at the non-return valve of this invention from the outer surface side. It is the top view which looked at the non-return valve of this invention from the inner surface side. It is the figure which showed the surface which the internal pressure of the non-return valve of this invention receives. It is sectional drawing which showed the state which can open the valve and the contents can be discharged | emitted in the container mouth vicinity using the non-return valve of this invention. FIG. 4 is a cross-sectional view of the vicinity of the mouth using a locking valve that is made easier to discharge by increasing the discharge port diameter in the check valve of the present invention, and a plan view showing the pressure receiving surface at that time. In the check valve of the present invention, the discharge window is eliminated and a protrusion is provided. This is an example in which the check spring of the present invention has three rebound springs. It is a detailed sectional view of a rebound spring in the check valve of the present invention. It is a detailed sectional view showing the state where the rebound spring was compressed with the check valve of the present invention. In the check valve of the present invention, the rebound spring shape is a spiral screw type.

Hereinafter, embodiments of the check valve 1 of the present invention will be described in detail with reference to the drawings.
A check valve 1 used in the embodiment is shown in FIG. The check valve 1 is attached to the mouth of a flexible container 2 such as a plastic blow molded container or an extruded tube.
When the contents filled in the flexible container 2 are poured out, the spout 210 of the mouth 21 sealed with the check valve 1 is opened, and the contents can be discharged from the inside to the outside. Can be easily checked to prevent air from entering.
A tapered spout 210 is provided at the mouth 21 of the container 2.
The check valve 1 includes a planar pressure receiving surface 3 that is installed in parallel with the surface of the tip 21;
It comprises a shaft 4 extending upward from the center of the pressure receiving surface 3,
The axis | shaft 4 has the reverse taper part 41 which fits into the said spout 210 from the outside, and has the reverse taper which can be closed.
In order to insert the check valve 1 into the container outlet 210, a tapered portion 42 is also provided on the upper portion of the shaft 4, and the reverse tapered portion 41 is connected by an arc.
A plurality of repulsion spring portions 5 are provided around the shaft 4 in the pressure receiving surface 3, and the check valve is pressurized inward by pushing down the inner surface of the mouth 21 with the repulsion spring portion 5, and the spout is provided with a taper. It plays the role of being pressed against the inner surface of 210 by the tapered portion 41 of the shaft 4.

FIG. 2 is a perspective view showing the appearance of the check valve 1 of the present invention.
The pressure receiving surface 3 is usually a plate-like plane like a disk, and a shaft 4 is provided at the center of the pressure receiving surface 3.
The front end side of the shaft 4 is once thickened in the middle, and the front end side is also tapered, but the root side is set to a reverse tapered portion 41 having a reverse taper that matches the taper of the spout 210. .
The pressure receiving surface 3 around the shaft 4 is provided with a repulsion spring 5 and a dispensing window 6 equally around the shaft.
The repulsion spring 5 is made of a resin spring and is designed so that it can be freely pressed and deformed by having square holes 51 formed by pushing left and right so that it can be easily molded by injection molding. ing.
The extraction window 6 provided on the pressure receiving surface 3 around the shaft 4 simply allows the contents to easily flow from the back surface of the pressure receiving surface 3 to the front surface. Therefore, the pouring window 6 may not be arranged evenly around the axis 4.

FIG. 3 is a plan view of the check valve 1 viewed from the outer surface side.
In this embodiment, the repulsion springs 5 are equally arranged in four directions, and the dispensing windows 6 are also arranged equally. As can be seen in this figure, the square holes 51 provided on the left and right sides of the rebound spring 5 have the same clearance as shown in FIG. It doesn't matter. However, when the contents are high in viscosity, it is necessary to increase the opening area in order to make the contents easy to be poured out with a small force by reducing the resistance to pass through as much as possible. Make it larger.

FIG. 4 is a plan view of the check valve 1 as viewed from the inner surface side.
A central portion of the shaft 4 is provided with a meat stealing recess.

FIG. 5 is a view showing a surface that is subjected to the internal pressure of the check valve of the present invention.
In FIG. 5A, the surface represented by the oblique line inclined to the upper right is the surface 7 that receives pressure applied from the outside to the inside.
In FIG. 5C, the surface represented by the oblique lines inclined to the upper left is the surface 8 that receives pressure applied from the inside to the outside.
Since the contents are liquid with viscosity, it is thought that force is applied uniformly in any direction in the container. Accordingly, the check valve 1 has a size in which the area of the surface 8 that receives the pressure applied from the inside to the outside is larger than the area of the surface 7 that receives the pressure applied from the outside to the inside, It becomes the force which pushes the stop valve 1 outward, and opens.
As can be seen by comparing FIGS. 5-1 and 5-3, only the presence or absence of the shaft 4 portion is different.
Therefore, in order to facilitate the pouring with a small internal pressure, the area of the shaft 4 portion may be made a large check valve 1.
Actually, since the contents are non-Newtonian fluids with viscosity, when flowing out, the check valve opens and the contents should flow out with a difference greater than the difference in area.

FIG. 6 shows a state in which the container is pushed from the outside to be deformed and pressure is applied to the inside.
When the internal pressure is increased to 1 atm or more, the pressure that pushes the check valve from the inside becomes larger than the pressure that pushes the check valve from the outside, and the repulsion spring 5 is pushed and deforms.
When the repulsion spring 5 is pushed and deformed, the reverse tapered portion 41 portion of the shaft 4 moves upward, and the spout 210 of the tip 21 of the container 2 and the reverse tapered portion 41 of the shaft 4 are separated to form a gap. The contents can be extracted from.

FIG. 7 shows a check valve 1 for dispensing a high-viscosity content. Usually, if the viscosity is high, a large force is required to pour out. However, this figure is an example of the check valve 1 that makes it easy to pour even with a weak force. The diameter of the shaft 4 is increased to increase the ratio of the shaft 4 portion of the pressure receiving applied to the whole, as well as the area of the opening and the dispensing window. The size of 6 is also up. The check valve 1 is easy to dispense even contents that are difficult to dispense, such as highly viscous contents.
Further, in the case of contents with particularly high viscosity, it is necessary to increase the diameter of the container body, and both the diameter and the shaft diameter of the check valve are increased.
Furthermore, the taper of the reverse taper part 41 and the extraction taper part 211 of the shaft 4 is increased. By enlarging, the gap of the spout 210 when the check valve 1 is actually moved is greatly widened, and the flow becomes easy even if the viscosity is high.

FIG. 8 shows an example in which the dispensing window 6 is eliminated and a protrusion 61 is provided instead. The protrusion 61 is formed in a kamaboko shape in the direction toward the axis and in the direction of flow so as not to hinder the flow of contents.
The role of this protrusion is to prevent the repulsion spring 5 from being pushed and the pressure receiving surface 3 to abut the inner surface of the tip 21 to close the content extraction path, so that the pressure receiving surface is uniformly pushed up and opened. There is an aim to make it possible. Therefore, even if the extraction window 6 is provided, the protrusion 61 may be provided.

  FIG. 9 shows an example in which the repulsion spring 5 is provided in three places. The repulsion spring 5 has a role of uniformly separating the pressure receiving surface 3 from the inner surface of the tip 21. Therefore, it is necessary to provide the repulsion springs 5 at least at three places and arrange them uniformly around the shaft 4. Of course, as long as it is evenly arranged at five or six places, the number may be large. However, if there are too many repulsive springs 5, the check valve 1 will not open unless a large internal pressure is applied, and it will be difficult to process the mold for removing the undercut of the reverse tapered portion 41 of the shaft 4. It is desirable to have four places.

FIG. 10 is a detailed sectional view in the vicinity of the repulsion spring 5. The shape of the repulsion spring 5 is not particularly limited. Basically, if both ends are connected to the pressure-receiving surface 3, an arc cross section is provided in the connection portion, and a certain end thin portion 52 is provided, it is easy to use.
The repulsion spring 5 pushes down the pressure receiving surface 3 so as to extend the spring, and presses the reverse taper portion 41 of the shaft 4 against the discharge taper portion 211 at the tip of the spout 210 to block the outside.
Usually, if both ends of the resin spring are connected to the pressure receiving surface 3, the strength of the spring increases, and the problem that it is difficult to deform and difficult to open tends to occur. However, if there is the end thin part 52, it will become easy to deform | transform from that part, a spring constant will become small, and durability will also improve. A connection portion between the end thin portion 52 and the pressure receiving surface 3 should have an arc cross section to improve durability.

  FIG. 11 shows a state in which the rebound spring portion 5 of FIG. 10 is compressed and deformed to open the spout. As shown in this figure, when the end thin portion 52 is provided, the repulsion spring portion 5 is freely deformed and tries to push the pressure receiving surface 3 outward.

FIG. 12 shows an example in which the shape of the repulsion spring portion is a spiral screw type. The repulsive screw spring portion 50 has a biting hole 53 formed by a biting die in the center of the spring, and the contents can be poured out through this hole.
In this way, a resin spring that can be molded with a die using a bite is applied to a check valve, and can be easily manufactured by injection molding.

The material used for the mouth body of the present invention has a bending rigidity of 1000 MPa to 2000 MP.
The relatively hard material a is preferred. For example, polypropylene, high density polyethylene resin, acrylonitrile butadiene resin, polymethyl methacrylate resin, polyethylene terephthalate resin, and polystyrene resin can be used.

The molding resin used for manufacturing the check valve 1 is preferably a relatively soft material having a bending rigidity of 10 MPa to 600 MPa and a Shore hardness of 30 A or more. For example, high pressure method low density polyethylene, linear low density polyethylene, ethylene / propylene rubber, polyoxymethylene resin, oxymethylene / oxyethylene copolymer resin, polyamide resin, polycarbonate resin, and mixtures thereof, butadiene rubber, silicon Rubber, urethane rubber, etc. can be used.
Also, since the check valve is used immersed in the contents, compatibility with the contents is also important, so when actually used, it is molded with the resin to be used and then fitted to the container body Then, using the contents to be filled, perform an environmental stress cracking test and make a judgment.

When the check valve of the present invention is attached to the tube container, simply insert the check valve 1 inside the container, and when the tip of the shaft 4 is located at the spout 210 portion, it is inserted by pressing at once. Is done.
In the case of a blow bottle, a method is used in which another piece of an inner stopper is used at the tip of the mouth, the check valve of the present invention is inserted into the inner stopper, and then the inner stopper is fitted into the container.

The check valve of the present invention is as described above, and can be obtained by simple injection molding. Therefore, the productivity is high, the assembly process is simple, and the check valve can be manufactured at low cost.
Moreover, it has been difficult to push out the contents to the end in the conventional plastic tube container, etc., but if the check valve of the present invention is used, the outside air can be easily and reliably blocked, so the viscosity of the contents Change is unlikely to occur.
In addition, there is an advantage that it is easy to squeeze the contents to the end, and there is a merit that helps to improve the residual rate.

1 ·····················································································································・ ・ ・ Taping taper part 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ Pressure receiving surface 4 ・ ・ ・ ・ ・ ・ ・ ・ Shaft 41 ・ ・ ・ Reverse taper part 42 ・ ・ ・ ・ ・ ・・ Taper part 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ Repulsion spring part 50 ・ ・ ・ ・ ・ ・ Repulsion screw spring part 51 ・ ・ ・ ・ ・ ・ ・ ・ Square hole 52 ・ ・ ・ ・ ・ ・ ・ ・ End Thin-walled part 53 ... Cutter hole 6 ... Pouring window 7 ... Surface 8 that receives pressure applied from outside to inside ...・ ・ ・ ・ ・ Surface receiving pressure applied from inside to outside

Claims (5)

In a check valve that is set so as to fit into the spout at the center of the mouth of the container body and to pour only from the inside of the spout,
A planar pressure-receiving surface;
A shaft extending upward from the center of the pressure receiving surface, fitted into the spout from the outside, and having a reverse taper;
A check valve characterized by comprising a plurality of repulsive spring portions provided around the shaft so as to protrude upward from the pressure receiving surface and in pressure contact with the inner surface of the spout peripheral edge.   The check valve according to claim 1, wherein a discharge window for discharging contents from the pressure receiving side to the discharge side of the pressure receiving surface is provided on the pressure receiving surface.   The check valve according to claim 1 or 2, wherein the pressure receiving surface is provided with a protrusion on the outlet side of the pressure receiving surface.   The check valve according to any one of claims 1 to 3, wherein the repulsion spring portion is made of a resin spring and is integrally formed with the pressure receiving surface by molding.   A container comprising the check valve according to claim 1.