JP6638211B2 - Plug with check valve and container having the plug - Google Patents

Description

  The present invention relates to a check valve which is mainly used for a container for storing contents composed of various liquids having a low viscosity to a high viscosity, such as sauce, ketchup, mayonnaise, fresh cream, toothpaste, shampoo, rinse, paste, ink, and the like. With a container, it is possible to easily pour out the contents from the container by pressing the body or tilting the body, and close the spout if stopping pressing or tilting the body. Further, the present invention relates to a plug having a backflow prevention valve function for stopping inflow of air into the container and the like, and a container having the plug.

  In the food field such as sauce, ketchup, mayonnaise and fresh cream, and in the non-food field such as toothpaste, hand cream, shampoo, rinse, paste, and ink, the contents with relatively high viscosity are high in viscosity. The act of opening the container to pour out the contents or frequently closing the spout is cumbersome and troublesome. In particular, when the contents are attached to a cap to be screwed, a problem such as an increase in opening / closing torque tends to occur. If the container is left open, the contents will be oxidized and degraded, causing mold, etc., causing deterioration, decay, discoloration, etc., and the loss of moisture, increasing the viscosity and solidifying near the spout. And other problems also occur.

  With an extruded tube made of metal such as aluminum or lead, there was no force to restore the contents after pouring out the contents, so that there was no problem that air flowed back into the inside. However, there is a problem that the metal extruded tube is not reliable or easy to use, such as a hole easily formed in the container. For this reason, extruded containers made of plastic as a main material, which is easy to use and has high productivity without forming a hole at the time of use, have become mainstream.

  However, extruded containers made of plastic as the main material have high resilience, so immediately after the body is pushed out and the contents are poured out, the resilience of the container works and air inside the container comes in from outside. May invade. When air enters the inside of the container from the outside, the contents are liable to be oxidized and deteriorated, and there is a problem of deterioration.

  In order to solve such a problem, Patent Document 1 discloses a synthetic resin container body in which a mouth and neck is erected from a squeezable body, and a spout is formed in a top plate extending over an opening of the mouth and neck. And a synthetic resin pouring plug that extends the top wall from the upper edge of the peripheral wall fitted to the outer periphery of the mouth and neck, and penetrates the top wall to erect a nozzle for pouring, A tube container has been proposed, in which a valve plate whose peripheral edge is pressed against an upper surface of a top plate around an outlet through an elastic bent piece protruding from a lower end portion of a nozzle inner surface is integrally extended. .

  The spout with such a valve plate is structured to prevent the contents from being accumulated on the check valve when it is opened due to falling down at the time of resealing, etc. The spout has a complicated shape and is molded integrally with the valve body by injection molding, so it is expensive to manufacture, and must be made of a material that satisfies the requirements of flexibility, elasticity, environmental stress crack resistance (ESCR) of the contents. Needs and has difficult problems. Also, if the container falls, the contents may be spilled.

JP 2001-301779 A

  In view of the above problems, it is desirable to obtain a stopper having a check valve element function that is less likely to cause the contents to stay in the vicinity of the spout, and is less likely to accidentally remove the spout, is inexpensive, has high durability, and is easy to use. Is the subject of the present invention.

The invention according to claim 1 of the present invention is a check valve with a check valve, comprising a check valve, an inner plug, and a cap covering the inner plug and the mouth.
On the inner peripheral surface of the cap, a screw portion to be screwed into the container body opening is provided,
The stopper is provided with a pressing projection that contacts the outer surface of the check valve after opening,
The check valve has a notch in which a circular part is missing in a sheet-like member ,
The position of the pushing protrusion is between the pushing protrusion and the top plate of the container mouth after opening.
A plug with a non-return valve, characterized in that it is located at a position sandwiching a valve body in a region inside the notch having a shape in which a part of a circle is missing .

  The plug with a check valve according to the present invention presses the valve body from the outside when the plug is closed, so that even if it falls down, there is no danger that the valve body will open and the contents will flow out. In addition, since the check valve is manufactured separately from the inner plug, it is possible to select a material that emphasizes the function of the valve element, and it is inexpensive, highly productive, and durable. You can get a stopper.

BRIEF DESCRIPTION OF THE DRAWINGS It is the external appearance perspective view and longitudinal cross-sectional view which are an example of the container which has the plug with a non-return valve of this invention. It is sectional drawing of the vicinity of a mouth showing the process of opening the plug with a check valve of this invention. A cross-sectional view of the vicinity of the mouth portion in which the closure plate of the plug with a check valve of the present invention is opened and the pourable state is obtained, and a cross-sectional view showing a state in which the cap of the container is closed and the valve body is pressed. is there. It is sectional drawing which shows the pouring state in the plug with a non-return valve of this invention, and perspective view which shows an example of a non-return valve body.

Hereinafter, the plug with a check valve according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view and a longitudinal sectional view of an example of a container having a plug with a check valve according to the present invention.
FIG. 1-1 is a perspective view showing an appearance of an example of the present invention.
The container has an elastic container body 2 having an opening 3 at an end, a check valve for preventing inflow of outside air, an inner stopper for fixing the check valve to the opening, and an inner stopper. And a cap 5 for covering the mouth. An extruded tube container was used as the container having elasticity. The body 21 may be a flexible blow-molded container having high flexibility, a blow-molded tube container, or an injection blow-molded container.

FIG. 1-2 shows the cross section.
A check valve 1 having a movable soft valve body is attached to an opening 3 provided at an end of the container body 2, and the check valve 1 is fixed by pressing the check valve 1 with the opening 3 and an inner plug 4. The check valve 1 is capable of discharging the contents from the inside to the outside, but has a function of closing when outside air flows in to prevent air or the like from entering the inside of the container. As shown in this figure, it is preferable that a pouring top plate portion 31 is provided at a pouring outlet of the mouth portion 3, and the check valve 1 is sandwiched between the pouring top plate portion 31 and the inner plug 4.

At the upper end of the side wall of the mouth 3, an engagement claw 35 that engages with the inner plug 4 is provided.
A closing plate 42 having a pull ring 421 is provided at an outlet of the inner plug 4, and the periphery thereof is connected by a weak line 422 when not opened.
At the time of opening, since the weak line 422 is broken and opened, the engaging claw 35 which engages with the inner plug engaging claw 43 of the inner plug 4 so that the entire inner plug 4 does not come off from the mouth 3 at that time. Is engaged. In order to maintain the sealing property, it is preferable to provide an inner ring 44 inside the inner plug engaging claw 43 so as to sandwich the engaging claw 35 of the mouth portion 3 as shown in the figure.

The outer peripheral side surface of the mouth and the inner peripheral side surface of the cap have screw portions that are screwed together.
A tamper-evident band 51 is provided at the lower end of the inner periphery of the cap, and is connected to the engagement ring 34 provided near the lower end of the outer peripheral screw portion of the mouth. Further, a pressing projection 52 is provided on the inner surface of the cap top plate. The pressing projection 52 is located above the closing plate 42 when not opened. However, when the cap is opened and the cap 5 is tightened with the tamper-evident band 51 and the closing plate 42 removed, the cap 5 comes into contact with the outer surface of the check valve 1 to prevent the check valve from opening.

FIG. 2-1 is a cross-sectional view near the mouth showing a step of opening the cap 5 of the container with a check valve according to the present invention. This is the first step in unsealing in which the knurl 53 around the cap is gripped and rotated.
At the lower end of the cap 5, a tamper-evident band 51 is provided. The tamper evidence band 51 is engaged with the engagement ring 34.
When the cap 5 is gripped and rotated, a force acts to pull up the entire cap 5.
However, since the lower end of the cap 5 is engaged with the engagement ring 34 of the mouth 3, the fragile portion, which is a connection portion between the cap and the tamper evidence, is broken at the time of opening.

FIG. 2-2 shows a state in which the tamper evidence band 51 and the cap body are separated.
A cut 511 is provided in the separated tamper evidence band 51. Therefore, the tamper-evident band 51 can be removed from the cut.

FIG. 3-1 is a cross-sectional view illustrating a process of pulling the pull ring 421 of the closing plate 42 provided at the spout of the inner plug 4 to open the container in which the cap 5 has been removed.
The closing plate 42 is connected to the inner plug 4 by a thin wire 422, which is torn open. When the closing plate 42 is removed and the valve body 11 of the check valve 1 is opened, the contents can be poured out.

  FIG. 4-1 shows a state in which the closing plate is detached and poured out. The container body 21 is pushed to increase the internal pressure, and the valve body 11 is open. When the internal pressure of the container body becomes lower than the external pressure, the valve element 11 of the check ring 1 is drawn, moves inward and closes the spout 33, so that the intrusion of outside air or the like into the inside can be suppressed.

  FIG. 4-2 shows an example of such a check valve 1, which is made of an elastic body having a notch in which a circular part is missing and in which the valve body 11 is open. Any shape may be used as long as it can open the valve body, and the shape of the cut may be any shape.

  FIG. 3-2 shows a state in which the cap 5 in which the tamper-evident band has been broken is tightened after removing the closing plate. Because there is no tamper evidence band, the cap 5 can be tightened to the mouth 3 as far as it will go. When the tamper-evidence band is present, the pressing protrusion 52 is located at a position away from the check valve 1, but when the tamper-evidence band is removed, the pressing protrusion 52 is set to the check valve 1. Abuts on the outer surface of the valve body 11. When the pressing projection 52 abuts on the valve body 11, the container falls down or erroneously pushes the outside of the container, and the valve body 11 does not move outward.

The container body 2 having elasticity used in the present invention is a container having a body 21 whose body is made of a flexible material. That is, by pressing the flexible body 21 from the outside of the container, a pressure is generated inside the container, and the increased pressure causes the contents near the spout 310 to be pushed out. It is.
As for the container body 2 used in the present invention, the manufacture of the extruded tube container as shown in FIG. After filling the contents 5 from the other end, the other end is fused to form a bottom seal portion 22.
The mouth 3 is made of a material that can be fused to the body 21. The inner surface may be integrated with a barrier sheet to form a shoulder having a barrier property.
The shoulder 33 at the mouth is fused to the neck fusion part 23 at the tip of the body 21 at the same time as molding.
For example, the body 21 is inserted into an injection molding die, the mouth 3 is injection-molded, and molding and fusion are simultaneously performed by the heat of the molten resin. Alternatively, an opening in which a constituent film containing a metal foil is bonded to the inner surface may be prepared in advance, and the opening 3 and the body 21 to which the metal foil-containing film is bonded may be produced by a high-frequency fusion method. .
The body 21 is made of a flexible material such as low-density polyethylene, lamination film with paper or metal foil, medium-density polyethylene,
Polyamide resin / maleic anhydride-modified polyethylene / low density polyethylene,
Low-density polyethylene / maleic anhydride-modified polyethylene / saponified ethylene / vinyl acetate copolymer / maleic anhydride-modified polyethylene / low-density polyethylene,
Low density polyethylene / maleic anhydride modified polyethylene / polyamide resin / maleic anhydride modified polyethylene / low density polyethylene,
An extruded tube container having a body having such a configuration is conceivable.
In addition, the elastic container used in the present invention may be a blow-molded container made of a thin and soft plastic as a whole, such as a mayonnaise container. Further, a blow-molded tube container in which the shoulder portion and the trunk portion are integrally formed and the bottom is sealed after filling the contents may be used. By adjusting the thickness of the check valve, a structure can be provided in which the container can be poured only by the pressure of the contents when the container is tilted without pressing the container.

  Since the container body 2 having such elasticity is made of plastic as a main material, it has high flexibility, but has a restoring force, that is, maintains its original shape, and returns to its original shape even when deformed. High shape memory to be used. Therefore, when the contents are discharged and the pressing of the container is stopped, the container tries to return to its original state, and in order to return the volume corresponding to the pushed-out internal volume, a force for sucking air from outside acts. However, in the case of the container with a check valve according to the present invention, when the internal pressure is reduced after the contents 5 are discharged, the valve element 11 immediately contacts the sealing surface to block the spout 310. The function works and there is no risk of air entering.

  The material used for the mouth portion 3 of the present invention is a hard material which does not deteriorate and does not deteriorate the contents 8, and is made of polypropylene resin, high-density polyethylene resin, medium-density polyethylene resin, acrylonitrile / butadiene / styrene. Polymer resins, polyoxymethylene resins, polyamide resins, polyethersulfone resins, and the like are conceivable, and can be manufactured by injection molding or compression molding.

  The material used for the backflow prevention valve body 1 may be any material as long as it does not deteriorate the contents and does not deteriorate. For example, polypropylene resin, polyoxymethylene resin, polyamide resin, polyether sulfone resin, high-density polyethylene resin, low-density polyethylene resin, fluorine resin, silicone rubber, fluorine rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber, etc. Conceivable. It is manufactured by punching a single layer or a laminate of a film made of these materials.

The plug with a check valve according to the present invention is as described above and has a check function, so that no air enters the inside. In addition, if the cap is closed, the check valve does not open, so that even if it falls, there is no danger of the contents being spilled.
In addition, an act such as cutting the tamper-evidence band of the cap, breaking the closure plate and pulling it out is necessary for opening, so that it is possible to make a clear judgment visually and confirm the virginity.
In addition, a film-shaped check valve having high productivity can be used. The advantages of the present invention are great, such as being inexpensive and having high productivity because the members are separate bodies and the optimal material can be used.

1 ... check valve 11 ... valve body 2 ... container body 21 ... body 22 ...・ ・ ・ ・ ・ ・ Bottom seal part 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ Neck fusion part (tip of body part)
3 ... Mouth 31 ... Pour-out top plate 32 ... Side wall 321 ... Screw 33 ... ······················································································ ·············································································· Inner ring 5 ...... Cap 51 ...... Tamper evidence band 510 ...... Fragile part 511 ... Cut 52 ...・ Pressing projection 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knurl 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ Contents

Claims (4)

In a check valve with a check valve, an inner plug, and a check valve with a check valve consisting of a cap that covers the inner plug and the mouth,
On the inner peripheral surface of the cap, a screw portion to be screwed into the container body opening is provided,
The stopper is provided with a pressing projection that contacts the outer surface of the check valve after opening,
The check valve has a notch in which a circular part is missing in a sheet-like member ,
The position of the pressing projection is the position where the valve body in the area inside the cut having a partially circular shape is sandwiched between the pressing projection and the pouring top plate of the container main body after opening. A spigot with a check valve, characterized in that it is provided .   The plug with a check valve according to claim 1, wherein the inner plug is provided with a closing plate connected via a thin wire.   A tamper evidence band connected to the lower end of the cap via a fragile portion is provided, and the tamper evidence band is engaged with an engagement ring provided on the container body opening. The plug with a check valve according to claim 1 or 2.   A container with a check valve, wherein the stopper according to any one of claims 1 to 3 is attached to an opening of the container body.