JP4294411B2 - Cap for liquid container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cap for a liquid container having a pouring stopper that can cope with a positive pressure state, and more specifically, detaching the pouring stopper at the stage of setting the pouring stopper on the cap body. Without being affected by the pressure and temperature inside the container after being attached to the container mouth, without leaving the stopper during the pouring in the container mouth, without relying only on the material deformation of the stopper during the pouring, The present invention relates to a liquid container cap capable of freely screwing and screwing only a cap body from a container opening.

Caps for liquid containers are used for containers that contain seasonings, edible oils and beverages (hereinafter referred to as “condiments etc.”), and many of them are mainly made of plastics in terms of production and material costs. . And this plastic liquid container cap is tightly screwed into the container mouth to make it liquid-tight, and is further provided with a stopper during pouring and fitted into the container mouth to The cut is good. In addition, this liquid container cap has a tamper evidence mechanism, and the fact remains once opened, so that various mischiefs can be prevented.

The following are examples of liquid container caps in which a stopper during filling is fitted into the above-mentioned container mouth part to improve the liquid drainage of seasonings and the like.
Utility model registration No. 2510503 gazette According to Patent Document 1, as shown in FIGS. 15 and 16, a liquid container cap a is a combination of a cap main body b and a cylindrical pouring stopper d with a flange c. Consists of. The cap body b is formed in the shape of an inverted plate and has a thread groove f formed inside the skirt e. The circumference of the cap body b is located on the extension line in the spiral direction in which the thread groove f is formed above the thread groove f. A plurality of locking claws g are formed along the. The dispensing stopper d is formed by projecting a flange c on the upper end of the cylindrical body h having a size matching the inner diameter of the container mouth, and the height of the locking claw g is higher than the height of the screw groove f. In addition, the flange c is formed so that its outer peripheral portion has an outer diameter dimension that can be fitted to a locking claw g formed on the inner upper end of the skirt e of the cap body b. Then, if the flange c of the outlet plug d is forcibly pushed into the inside from the lower surface of the cap body b, the outer peripheral portion of the flange c instantaneously reaches the locking claw g while getting over the screw groove f, and is accurately locked. I can do it. In order to take out the liquid in the container, the cap main body b may be screwed off, and the cap main body b can be rotated and removed while using the locking claw g, the thread of the container mouth and the flange c as a guide, Even if no special operation is performed, the discharging stopper d remains in the container mouth portion, and functions as a discharging stopper for preventing dripping.

If the cap a for liquid container is forcibly pushed into the cap body b and the flange c of the outlet plug d is forcibly pushed, the outer peripheral portion of the flange c can get over the screw groove f and be instantly locked to the locking claw g. ,
When the inside of the container has a positive pressure, the sealing performance of the locking portion is lowered and it becomes difficult to cope with it. Moreover, when taking out the liquid in a container, it is necessary to unscrew the cap main body b from a container opening part, and the stopper nail | claw g of the cap main body b fits into the container opening part for that. The outer peripheral part of the flange c of d is disengaged and the thread groove f of the cap body b has to get over the outer peripheral part of the flange c. Therefore, the condition in which the discharging stopper d does not come off depends on the contact frictional force between the inner peripheral surface of the container mouth and the outer peripheral surface of the cylindrical body h of the discharging stopper d. That is, the locking claw g of the cap body b
The resistance when the cap body b engages and disengages the outer peripheral portion of the flange c and the resistance when the screw groove f of the cap main body b gets over the outer peripheral portion of the flange c is always smaller than the contact friction force when the cap main body b is unscrewed. There must be.

However, in this patent document 1, since the cylindrical body h of the spouting stopper d is sized to match the inner diameter of the container mouth, the contact frictional force cannot be expected. There is a very high possibility of losing. In addition, locking and disengaging from the locking claw g of the cap body b, and overcoming the thread groove f, relying only on the material deformation of the outer peripheral portion of the flange c of the outlet plug d, the load is heavy. Further, since the outer peripheral portion of the flange c has a function for running out of the liquid, it is difficult for the discharging plug d to fulfill the function of preventing dripping.

Therefore, the object of the present invention is that there is no detachment of the stoppering plug at the stage of setting the stoppering stopper on the cap body, and the container is not affected by the pressure and temperature in the container after being attached to the container mouth. A cap for a liquid container that allows the cap body to be screwed and screwed freely from the container mouth without relying only on the deformation of the material during the pouring while leaving the stopper during pouring at the mouth. It is to provide.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, a cap for a liquid container comprising a cap body and a dispensing plug of a cylindrical body having a flange near the upper end,
The cap body has a skirt that hangs down from the peripheral edge of the top and is formed with a thread that is threaded into the container mouth on the inner peripheral surface, and on the inner surface of the corner between the skirt and the top, An annular seal portion that protrudes and seals the container mouth portion, and a spouting stopper locking projection that contacts the upper surface of the flange when fitted to the container mouth portion radially inward from the annular seal portion, The inner surface of the top portion has an inner ring that can be sealed with the inner periphery of the spouting stopper when fitted to the container mouth portion, and the annular seal portion has an annular shape that seals the outer end of the container mouth portion. An outer ring is formed, a corner seal portion that is located above the outer ring and seals the outer corner portion of the container mouth portion, and a top surface of the container mouth portion is located above the corner seal portion. is formed and the top surface sealing part for sealing Ri,
The dispensing stopper is formed with a thin locking portion that locks with the annular seal portion at the outer periphery of the flange, and an annular engagement that locks with the inner periphery of the container mouth at the outer periphery of the middle part of the cylindrical body below the flange. A stop projection is formed, the bottom surface of the flange is formed so as to contact the top surface of the container mouth when fitted to the container mouth , and the pouring stopper is inserted into the cap body, A protrusion is formed at the upper inner periphery of the cylindrical body of the outlet plug with a clearance between the inner ring and the outer ring of the cap body. A cap for a liquid container is provided which is formed so as to be locked to an outer peripheral surface in a pressure contact state .

According to the present invention, when the thin locking portion of the flange of the spouting plug is pushed into the inside from the lower surface of the cap main body and locked to the annular seal portion of the cap main body, when the cap main body is screwed to the container mouth portion In addition, the stopper during pouring can be fitted into the container mouth without detaching from the cap body. At the same time, the outlet stopper moves slightly inward to seal the outer periphery of the cap body's inner ring and the inner periphery of the outlet stopper, and the stopper's locking protrusion and the inner peripheral surface of the container mouth. In addition, the outer ring moves slightly to the outside and the outer ring of the cap body and the outer tip of the container mouth are sealed. In addition, the top surface of the flange of the stopper and the cap body are being poured out. The stopper locking projection is in contact with the bottom surface of the flange and the top surface of the container mouth.
In addition, when the cap body is screwed off from the container mouth, as described above, the outer ring of the cap body has also moved to the outside in addition to the stopper being moved slightly to the inside during dispensing,
The thin stopper part of the flange of the spout stopper is disengaged from the annular seal part of the cap body, and the annular seal part of the cap body does not hit the thin stopper part of the flange of the spout stopper. Only the cap body can be smoothly screwed off. Therefore, there is no detachment of the stopper during pouring at the stage of setting the stopper during pouring on the cap body, and it is being poured into the container mouth without being affected by the pressure or temperature inside the container after being attached to the container mouth. With the stopper remaining, there is an effect that only the cap body can be screwed and screwed freely from the container mouth without relying only on the material deformation of the stopper during pouring.

In addition, by sealing the outer corner portion and top surface of the container mouth with the corner seal portion of the annular seal portion of the cap body and the top surface seal portion thereabove, the seal between the cap body and the container mouth portion is more reliably secured. There is an effect.

Furthermore, since the protrusion on the inner periphery of the inner portion of the inner tube of the pouring plug has a clearance between the outer ring and the outer ring of the inner ring of the cap main body, The stopper is easy to insert, and when the cap body and the outlet plug are attached to the container mouth, the ridge of the outlet stopper is locked in contact with the outer peripheral surface of the inner ring, and the cap body and the outlet stopper Therefore, it is easy to lock the stopper during extraction to the cap body, and there is an effect that the sealing performance between the cap body and the stopper stopper during extraction is more reliable.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a state in which the cap for a liquid container of the present invention is attached to the mouth of a container, and FIG. 2 is a cross-sectional view of the main part showing a process of capping the cap for a liquid container of the present invention to the container mouth. .
In the figure, a cap 1 for a liquid container has a cap body 4 that is screwed into a mouth 3 of a container 2 (hereinafter referred to as a container mouth 3 when the mouth 3 is shown), and a flange 5 in the vicinity of the upper end. The cap body 4 has a skirt 9 formed with a thread 8 that hangs down from the periphery of the top 7 and is screwed into the container mouth 3 on the inner peripheral surface. This skirt 9 and top 7
And an annular seal portion 10 that protrudes inwardly to seal the container mouth portion 3 and contacts the upper surface of the flange 5 when capping the container mouth portion 3 radially inward from the annular seal portion 10. The inside of the top 7 has an inner ring 12 that can be sealed with the inner periphery of the outlet stopper 6 when capping the container mouth 3. The seal portion 10 is formed with an annular outer ring 13 that seals the outer front end of the container mouth portion 3. On the other hand, the outlet plug 6 has a thin wall that engages with the annular seal portion 10 on the outer periphery of the flange 5. A locking portion 14 is formed, and an annular locking protrusion 15 is formed on the outer periphery of the middle of the cylindrical body below the flange 5 to lock the inner periphery of the container mouth 3, and the lower surface of the flange 5 is connected to the container mouth 3. Is formed so as to come into contact with the top surface of the container mouth 3 at the time of fitting. It is intended.

The shape and material of the container 2 are not particularly limited. However, since the contents of the container 2 are usually seasonings, edible oils, beverages, and the like, polyethylene, polypropylene, polyethylene terephthalate suitable for these uses, Is made of a material such as glass, and is generally bottle-shaped. In this embodiment, the container 2 is a cylindrical plastic bottle 20, which includes a container mouth portion 3, a shoulder portion, a trunk portion, and a bottom portion. The container mouth portion 3 has a ridge 21, on which a cap body 4 is placed. There is a thread 22 along the thread 8, and the cap body 4 is screwed.

The cap body 4 has an axial knurl 23 formed on the outer peripheral surface of the skirt 9 to prevent slipping at the time of initial opening and screwing, and a tamper evidence mechanism for preventing unauthorized opening at the lower end of the skirt 9. 24 is provided with a band 25, and the band 25 and the cap body 4 are integrally formed. The tamper-evidence mechanism 24 connects the skirt 9 of the cap body 4 and the band 25 below the cap body 4 with an easily breakable connecting rib 26, and a stopper 27 is provided on the skirt 9 and the band 25, and these are screwed. If the cap body 4 is screwed (closed) to the container mouth 3 by rotating in the direction of fitting (closing direction), and conversely, the cap body 4 is rotated in the screwing direction (opening or unsealing direction). The tether rib 26 is broken leaving the band 25 in the container mouth 3, whereby the tampering is immediately recognized, and the cap body 4 can be unscrewed (opened) from the container mouth 3. is there.

The annular seal portion 10 of the cap body 4 includes a corner seal portion 28 that is located above the outer ring 13 and seals the outer corner portion of the container mouth portion 3, and is located above the corner seal portion 28. Thus, a top surface sealing portion 29 that seals the top surface of the container mouth portion 3 is formed. By these corner seal portions 28 and the top seal portion 29 above them,
Since the outer corner and the top surface of the container mouth 3 are sealed, the sealing performance between the cap body 4 and the container mouth 3 is more reliable.

The pouring spigot 6 is fitted to the container mouth portion 3 to prevent the liquid from leaking out of the seasoning or the like, and prevents the liquid from dripping. The flange 5 is formed above the cylindrical portion 16, and the thin-walled locking portion 14 is formed on the outer periphery of the flange 5. Further, above the flange 5, there is a spout 30 spreading in a trumpet shape, and a hole 31 is opened at the bottom of the cylindrical portion 16. An annular protrusion 32 is formed on the inner periphery of the upper portion of the cylindrical portion 16 of the discharging plug 6, and when the protruding plug 32 is fitted into the cap body 4, A clearance 33 is formed between the cap body 4 and the outer periphery of the inner ring 12. In addition, the protrusion 32 is pressed against the outer peripheral surface of the inner ring 12 when fitted to the container mouth 3. It is formed so as to be locked in a state. Therefore, since the protrusion 32 has a clearance 33 between the outer ring 12 and the inner ring 12, the thin locking portion 14 of the flange 5 of the outlet plug 6 can be easily inserted into the annular seal portion 10 of the cap body 4. Furthermore, when the cap body 4 and the outlet plug 6 are attached to the container opening 3, the protrusion 32 is locked in contact with the outer peripheral surface of the inner ring 12 so that the cap body 4 and the outlet stopper 6 The sealing performance is improved, and these seals are more reliable.

Next, a method of using the liquid container cap 1 configured as described above will be described.
First, the container 2 suitable for the seasoning etc. which are the contents, the integral body of the cap main body 4 and the band 25 which constitutes the liquid container cap 1 corresponding thereto, and the spouting stopper 6 are selected. Next, when the extraction stopper 6 is pushed into the inside from the lower surface of the cap body 4, the thin stopper 14 of the flange 5 of the extraction stopper 6 is easily engaged with the annular seal portion 10 of the cap body 4. The stopper 6 is not dropped from the cap body 4 in the subsequent capping line. The container 2 is filled with the contents, and then, the cap body 4 and the band 25 are integrally screwed into the container mouth 3 by the capping line, and the cap 1 is thereby attached to the container mouth 3.
To make it liquid-tight. At this time, the stopper 27 provided on the skirt portion 9 and the band 25 of the main body cap 4 is rotated synchronously in the screwing direction (capping direction), so that the easily breakable tether rib 26 of the tamper evidence mechanism 24 is formed. The container mouth 3 without breaking
The cap body 4 can be screwed (closed). The process in the capping line is as follows.

The cap body 4 and the band 25 shown in FIG. 8 with the stopper 6 being locked out are fitted into the end of the container mouth 3 and screwed together as shown in FIG. As a result, the tip of the container mouth 3 enters between the skirt 9 of the cap body 4 and the cylindrical portion 16 of the outlet plug 6 so that the cylindrical portion 1
6 (see FIG. 10). Further, when the screws are engaged, the inner end portion of the container mouth 3 hits the annular locking projection 15 of the cylindrical portion 16, and an inner force A acts on the cylindrical portion 16, and the thin locking portion 14 is The protrusion 32 is engaged with and disengaged from the annular seal portion 10, and the outer end portion of the container mouth portion 3 comes into contact with the outer ring 13 of the cap body 4 (see FIG. 11). Furthermore, as shown in FIG. 12, a force B in the outer direction acts on the outer ring 13,
When the thin locking portion 14 is completely disengaged from the annular seal portion 10 and the outer corner portion of the container mouth portion 3 is sealed by the corner seal portion 28 of the annular seal portion 10, the state shown in FIGS. The top surface of the container mouth portion 3 is sealed by the top surface seal portion 29 of the annular seal portion 10.

That is, in the state shown in FIGS. 13 and 14, the outlet plug 6 slightly moves inward, and the inner ring 12 of the cap body 4 and the protrusion 32 on the inner peripheral surface of the outlet plug 6 are sealed. The locking projection 15 of the outlet plug 6 and the inner peripheral surface of the container mouth 3 are sealed, and the container mouth 3 is slightly moved outward to cause the outer ring 13 and the container mouth 3 of the cap body 4 to move outward. And the outer tip of the
The outer corner portion and the top surface of the container mouth portion 3 are sealed by the corner seal portion 28 and the top surface seal portion 29 of the annular seal portion 10. In addition, the upper surface of the flange 5 of the outlet stopper 4 and the stopper stopper projection 11 of the cap body 4 are sealed, and the lower surface of the flange 5 and the top surface of the container mouth 3 are sealed. 3 and the cap main body 4 and the plug 6 during dispensing are completely sealed. On the other hand, since the thin locking portion 14 of the outlet plug 6 is disengaged from the annular seal portion 10 of the cap body 4, the locking state between the cap body 4 and the outlet stopper 6 is eliminated. . In this way, capping with respect to the container mouth 3 is completed.

In use, when the cap body 4 is turned in the opening direction by fingers using the knurl 23 of the cap body 4, the easily breakable tether rib 26 of the tamper evidence mechanism 24 is cut,
Since the locking state between the cap body 4 and the discharging spout 6 has been eliminated, the cap body 4 can be easily removed from the container opening 3, and seasonings and the like from the spout 30 of the discharging spout 6. Can be taken out. If seasonings etc. remain in the container 2, the cap main body 4 can be screwed again into the container mouth part 3, and the preservation becomes easy. On the other hand, once the cap main body 4 is removed from the container mouth portion 3, the band 25 falls to the flange 21 of the container mouth portion 3. Therefore, if the above-described screwing is tampered with, the legitimate unsealed band 25 It is possible to visually observe that it is falling and easily sight that the easily breakable tether rib 26 is cut, so that the fact of tampering can be recognized immediately and clearly, and danger can be avoided easily. .

As mentioned above, although the Example of this invention was described, it cannot be overemphasized that a specific structure is not limited to this but can be suitably changed and added in the range which does not deviate from the summary of this invention.

The liquid container cap of the present invention can be used in general for containers that contain liquid, but the temperature and pressure in the container fluctuate, and the applicability becomes extremely high particularly when the pressure is positive.

It is sectional drawing of the state which mounted | wore the container opening part with the cap for liquid containers of this invention. It is sectional drawing of the principal part which shows the process of capping the cap for liquid containers of this invention to a container opening part. It is a side view of the cap main body of the cap for liquid containers of this invention. FIG. 4 is a cross-sectional view of FIG. 3. It is a side view of the stopper | injection stopper of the cap for liquid containers of this invention. It is sectional drawing of FIG. FIG. 6 is a plan view of FIG. 5. It is sectional drawing of the state which mounted | wore the pouring inside stopper in the cap main body in the cap for liquid containers of this invention. It is sectional drawing which shows the process 1 of capping the cap for liquid containers of this invention to a container opening part. It is sectional drawing which similarly shows the capping process 2. FIG. It is sectional drawing which similarly shows the capping process 3. It is sectional drawing which similarly shows the capping process 4. It is sectional drawing which similarly shows the capping process 5. It is sectional drawing to which the principal part of FIG. 13 was expanded. It is sectional drawing of the cap for liquid containers of a prior art example. It is a reverse view of the liquid container cap of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, a Cap for liquid container 2 Container 3 Mouth part 4, b Cap body 5, c Flange 6, d Discharging middle stopper 7 Top part 8 Thread 9, e skirt 10 Annular seal part 11 Discharging stopper stopper 12 Inner ring 13 Outer ring 14 Thin locking portion 15 Locking protrusion 16 Tube portion 20 PET bottle 21 鍔 22 Thread 23 Knurl 24 Tamper evidence mechanism 25 Band 26 Connecting rib 27 Stopper 28 Corner seal portion 29 Top seal portion 30 Pour Port 31 Hole 32 Projection 33 Clearance f Thread groove g Locking claw h Tube body

Claims (1)

A cap for a liquid container comprising a cap body and a spout of a cylindrical body having a flange near the upper end,
The cap body has a skirt that hangs down from the peripheral edge of the top and is formed with a thread that is threaded into the container mouth on the inner peripheral surface, and on the inner surface of the corner between the skirt and the top, An annular seal portion that protrudes and seals the container mouth portion, and a spout locking stopper locking projection that contacts the upper surface of the flange when fitted to the container mouth portion radially inward from the annular seal portion, and the top portion The inner surface has an inner ring that can be sealed with the inner periphery of the outlet stopper when fitted to the container mouth, and the annular seal portion has an annular shape that seals the outer tip of the container mouth. An outer ring is formed , and a corner seal portion that is positioned above the outer ring and seals an outer corner portion of the container mouth portion, and a top surface of the container mouth portion is sealed above the corner seal portion. you and the top surface seal portion which is formed ,
The dispensing stopper is formed with a thin locking portion that locks with the annular seal portion at the outer periphery of the flange, and an annular engagement that locks with the inner periphery of the container mouth at the outer periphery of the middle part of the cylindrical body below the flange. A stop projection is formed, the bottom surface of the flange is formed so as to contact the top surface of the container mouth when fitted to the container mouth , and the pouring stopper is inserted into the cap body, A protrusion is formed at the upper inner periphery of the cylindrical body of the outlet plug with a clearance between the inner ring and the outer ring of the cap body. A cap for a liquid container, wherein the cap is formed so as to be engaged with an outer peripheral surface in a pressure contact state .

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