JP5936933B2 - Cap for liquid container - Google Patents

Description

  The present invention relates to a stopper for a liquid container.

  Conventionally, the applicants of the present application have disclosed a discharge container with a filter using a delami bottle (laminated peeling bottle) that can be suitably used for a sterile eye drop container or the like, for example, in Patent Documents 1 and 2 below.

Japanese Patent Laid-Open No. 2002-80055 JP 2009-179403 A

  In these conventional discharge containers with a filter, an outer layer bottle provided with a mouth at the upper end of a squeeze-deformable body, and an opening provided inside the outer layer bottle and connected to the mouth of the outer layer bottle An inner layer bag having a cap attached to the mouth of the outer layer bottle, the outer layer bottle has an introduction hole for introducing outside air between the outer layer bottle and the inner layer bag, The spout is provided with a discharge passage for discharging the content liquid contained in the inner layer bag, and a filter and a check valve are provided in the discharge passage.

  As this filter, a membrane filter or the like having a large number of fine holes that do not allow the passage of viruses and bacteria is used. In the above-mentioned Patent Document 1, the check valve is a valve body elastically supported by a thin piece. In the above-mentioned Patent Document 2, the main structure is formed by inserting a cross-shaped orifice into a valve head of a valve body formed of an elastic material.

  A filter having a large number of micropores as described above becomes so-called air-locked when the micropores are closed by moisture when wet, and air can pass through without applying high pressure that exceeds the bubble point of the filter. Therefore, it is required to keep the filter in a dry state when storing the container before the first use.

  However, in the above-mentioned conventional container plug structure, a highly permeable liquid may ooze out from the check valve, and the liquid that has oozed out wets the filter, causing an air lock. There is a possibility that the discharge of the content liquid is hindered by the air remaining on the upstream side. That is, in the check valve described in Patent Document 1, since the valve hole is sealed by bringing the disc-shaped valve body into contact with the valve hole, the adhesion between the valve body and the valve hole is In the case of a relatively weak and highly permeable liquid, it may ooze out between the valve element and the valve hole. Further, in the check valve described in Patent Document 2, the orifice is formed by cutting, and an external force that strongly adheres the orifice does not act, so that in the case of a highly permeable liquid, the orifice may ooze out from the orifice. .

  Furthermore, in the case of a check valve mechanism, a valve body is installed to draw the liquid agent downstream of the filter, but the orifice is opened by raising the valve head when the liquid contents are dropped after the second use. It is necessary to squeeze and deform the outer layer bottle relatively strongly in order to cause the content liquid to drip due to this lifting resistance, and a comfortable feeling of use cannot be obtained.

  In addition to the above conventional delamination containers, the discharge port is sealed with a sealing member such as a pull ring or an aluminum sealing film in single-layer bottles for various cosmetics and detergents, and sealed by the user during use. Some of the members are configured to remove the member, but it takes time and effort to remove the sealing member, and some users feel troublesome.

  Therefore, the present invention reliably prevents the content liquid from seeping out to the filter before the first use in the plug structure of various liquid containers, and can be opened only by the discharge operation of the content liquid. Thus, it is an object of the present invention to improve the convenience of the user at the first use, and to reduce the discharge resistance at the second and subsequent uses.

  In order to achieve the above object, the present invention takes the following technical means.

  That is, the stopper of the liquid container of the present invention comprises a stopper holder that is attached to the mouth of the liquid container and has a discharge passage for the content liquid, and a stopper provided in the discharge passage. In the middle of the discharge path, there is provided a fitting portion for fitting the plug so that the discharge passage is closed by fitting and the liquid container is pushed out from the fitting portion by the increased internal pressure. It is a feature.

  In the stopper of the liquid container according to the present invention, the plug body closes the discharge path by fitting to the fitting portion, and discharges the liquid content around the plug body when not fitted to the fitting portion. An opening for forming the discharge path is formed. Therefore, the leaching of the content liquid can be reliably prevented by fitting the plug into the fitting portion with a fitting force that does not allow the content liquid to bleed out until the first discharge. Since the stopper is detached from the fitting portion by increasing the internal pressure of the container by squeezing deformation or the like of the barrel of the container while having a structure in which the stopper is fitted to the fitting portion in this way, the first time A special opening operation is not necessary when the content liquid is discharged, and a squeeze operation or the like may be performed slightly stronger only during the first discharge. In addition, when the plug body is removed from the fitting portion, the plug body momentarily jumps out of the fitting portion due to the pressurized internal pressure of the container. Thus, even if the structure of the plug body cannot be visually confirmed from the outside, it is possible to make the user recognize that the discharge passage is communicated by this vibration. In addition, when the plug holder is attached to the mouth portion, the plug body is configured so that it cannot be removed from the plug holder, so that the plug body is removed from the plug holder when the plug body is detached from the fitting portion. It can prevent jumping out.

  In addition, the present invention provides a stopper for a liquid container that includes a stopper holder that is attached to a mouth portion of a liquid container and has a discharge path for a content liquid, and a stopper member that is held by the stopper holder. The plug holder is integrally formed with a base portion attached to the plug holder, a plug body provided in the discharge passage, and an elastic connection portion that elastically connects the plug body and the base portion. In the middle of the discharge path, there is provided a fitting portion for closing the discharge passage by fitting and for fitting the plug so that the liquid container is pushed out by the increased internal pressure of the liquid container. After the base is attached to the plug, the plug is pushed upstream, so that the plug is fitted into the fitting portion with a predetermined fitting force, and the plug is pushed downstream with a biasing force smaller than the fitting force. The urging force to urge toward the side is in front And it is characterized in that it is configured to generate the elastic connecting portion.

  In the stopper of the liquid container according to the present invention, the plug body closes the discharge path by fitting to the fitting portion, and discharges the liquid content around the plug body when not fitted to the fitting portion. An opening for forming the discharge path is formed. Therefore, the leaching of the content liquid can be reliably prevented by fitting the plug into the fitting portion with a fitting force that does not allow the content liquid to bleed out until the first discharge. Since the stopper is detached from the fitting portion by increasing the internal pressure of the container by squeezing deformation or the like of the barrel of the container while having a structure in which the stopper is fitted to the fitting portion in this way, the first time A special opening operation is not necessary when the content liquid is discharged, and a squeeze operation or the like may be performed slightly stronger only during the first discharge. At this time, the urging force accumulated in the elastic connection portion assists the detachment of the plug body from the fitting portion, so that the fitting force is ensured so that the content liquid does not exude, and the first discharge is performed. The operating force can be reduced. In addition, when the plug body is detached from the fitting portion at the first discharge, the plug body is held at the detached position by the elastic connecting portion thereafter, and the plug body is fitted again to the fitting portion to close the discharge passage. Therefore, the content liquid can be smoothly discharged with a relatively light force during the second and subsequent discharges. Moreover, since the plug body, the base portion, and the elastic connection portion are integrated as a plug member, it is possible to improve the assembly workability, reduce the number of parts, and thus reduce the manufacturing cost. Furthermore, since the mounting position of the plug body is positioned by mounting the base portion, the plug body is automatically positioned with respect to the fitting portion, and the occurrence of poor fitting during mass production can be reduced. In addition, when the plug body is removed from the fitting portion, the plug body momentarily jumps out of the fitting portion due to the pressurized internal pressure of the container. Thus, even if the structure of the plug body cannot be visually confirmed from the outside, it is possible to make the user recognize that the discharge passage is communicated by this vibration. In addition, when the plug holder is attached to the mouth portion, the plug body is configured so that it cannot be removed from the plug holder, so that the plug body is removed from the plug holder when the plug body is detached from the fitting portion. It can prevent jumping out.

  In the present invention, further comprising a cover attached to the stopper holder, a mounting recess for accommodating a stopper member is formed at the downstream end of the stopper holder, the base is attached in the recess, The fitting portion is provided on the back side of the mounting recess, the cover includes a top portion that covers the mounting recess, a discharge nozzle portion is provided on the top portion, and a base portion of the plug member and the plug body are attached. The cover may be attached to the plug holder assembled to the recess and the fitting portion. According to this, the workability of assembling the plug member can be improved, and the plug body can be securely fitted by being pushed into the fitting portion from above. And it can be handled as one assembly part with the stopper holder and cover integrally fitted, and in the content liquid filling factory, the plug as this assembly part is a container after filling the content liquid agent. What is necessary is just to attach to a mouth part, and improvement of mass-productivity and quality controllability is aimed at.

It is principal part sectional drawing at the time of sealing of an eyedrop container provided with the spigot which concerns on 1st Embodiment of this invention. It is principal part sectional drawing at the time of seal | sticker opening | release of the same container. The stopper member in the container is shown, (a) is a plan view and (b) is a longitudinal sectional view. It is principal part sectional drawing at the time of sealing of an eye drop container provided with the stopper concerning 2nd Embodiment of this invention. It is principal part sectional drawing at the time of seal | sticker opening | release of the same container. The stopper holder in the container is shown, (a) is a plan view and (b) is a longitudinal sectional view. It is principal part sectional drawing at the time of sealing of a liquid container provided with the spigot concerning 3rd Embodiment of this invention. It is principal part sectional drawing at the time of the seal opening operation of the container. It is principal part sectional drawing at the time of the content liquid discharge of the container. It is principal part sectional drawing at the time of sealing of a liquid container provided with the stopper which concerns on 4th Embodiment of this invention. It is principal part sectional drawing at the time of the seal opening operation of the container. It is principal part sectional drawing at the time of the content liquid discharge of the container. It is a whole sectional view of the liquid container concerning a 5th embodiment of the present invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG.1 and FIG.2 has shown the eye drop container 1 provided with the stopper structure of the liquid container which concerns on one Embodiment of this invention. The basic configuration of the eye drop container 1 is the same as that of Patent Documents 1 and 2 described above. The eye drop container 1 includes a laminated bottle 2 having an inner and outer two-layer structure formed by blow-molding a bottomed cylindrical laminated parison, and the bottle 2. And a mouth plug 3 mounted on the mouth portion 2a. The mouth plug 3 is provided with a discharge passage for discharging the liquid content. Further, a filter 33 and a plug body 34 that seals the discharge path until the first discharge on the upstream side of discharge of the filter 33 are provided in the discharge path of the plug 3. By turning the laminated bottle 2 upside down and squeezing the body part by pressing, the content liquid (fluid) inside the bottle 2 passes through the discharge passage in the plug 3 and is dripped from the tip nozzle part 3a. .

  The laminated bottle 2 has a laminated structure of an outer layer bottle 21 (squeeze bottle) constituting an outer layer and an inner layer bag 22 (fluid containing bag) constituting an inner layer. The outer layer bottle 21 and the inner layer bag 22 both have a cylindrical mouth portion and a body portion having an elliptical cross section immediately after blow molding. The outer layer bottle 21 can be formed of, for example, a synthetic resin material such as PET or SBS, and the inner layer bag 22 is a synthetic resin having a property of easily peeling from the outer layer bottle 21 (for example, polyolefin such as polypropylene or polyethylene). It is even better if it is a material that can be molded by electron beam sterilization and γ sterilization. The mouth portion of the bag 22 constitutes an opening portion for discharging the content liquid, and the opening portion of the bag 22 is fixedly connected to the mouth portion of the outer layer bottle 21.

  The outer bottle 21 is provided with a cylindrical mouth portion at the upper end of a bottomed cylindrical body that can be elastically squeezed and deformed through a shoulder that gradually decreases in diameter as it moves upward. is there. The outer layer bottle 21 may have any structure. However, as disclosed in Patent Document 2, the front and rear wall portions may be rigid wall portions. The outer bottle 21 is provided with an introduction hole (not shown) for introducing outside air between the outer bottle 21 and the inner bag 22. The introduction hole is preferably provided in the body portion of the outer layer bottle 21 as disclosed in Patent Document 2, but can also be provided in the bottle bottom portion or the mouth portion.

  The inner layer bag 22 has a film shape and is easily contracted and deformed as the content liquid decreases. On the other hand, after discharging the content liquid, the front end nozzle portion of the discharge path on the downstream side of the filter 33 is discharged. It has a restoring elasticity for sucking back the liquid content remaining in 3 a to the upstream side of the filter 33. On the other hand, the mouth portion of the inner layer bag 22 is formed to be relatively thick compared to the trunk portion.

  The plug 3 includes a cylindrical plug holder 31, a cover 32 fitted around the plug holder 31, the filter 33 and the plug body 34. The center of the stopper holder 31 penetrates in the vertical direction so as to form a discharge path for the liquid contents. The cover 32 has a disk-like top portion 32a (top plate portion), and is formed so that the nozzle portion 3a penetrates in the vertical direction at the center portion of the top portion. A discharge path for discharging the content liquid stored in the inner layer bag 22 is constituted by the central discharge path. In addition, the whole top part may be comprised by the nozzle shape.

  The stopper holder 31 includes a cylindrical base portion 31a that is externally fitted to the mouth portion of the outer layer bottle 21, and a content liquid outlet portion 31b that is integrally formed inside the base portion 31a and has a smaller diameter than the base portion 31a. The content liquid lead-out part 31b is fitted in the bottle mouth part 2a in a liquid-tight manner. A plug fitting recess 31c (fitting portion) is formed in the upper open portion at the upper end portion of the content liquid outlet portion 31b. The inner peripheral surface of the plug holder 31 is formed so as to gradually increase in diameter from the fitting portion 31c to the upper side, and is formed at the upper end portion (downstream end portion) of the plug holder 31. The elastic support portion 35 of the plug body 34 is accommodated in the mounting recess (internal space).

  The cover 32 is integrally attached to the stopper holder 31 by being externally fitted from above, and a filter 33 is disposed on the lower surface side of the top portion 32a before the attachment. The tip nozzle part 3a of the plug 3 is provided in the center part of the cover 32, and the content liquid agent which passed the filter 33 is discharged outside from the tip nozzle part 3a.

  Examples of the filter 33 include a membrane filter, a sintered body filter, a hydrophilic porous flat membrane, and a hydrophobic porous flat membrane from the discharge downstream side (outside the container) to the discharge upstream side (inside the container). Those capable of preventing permeation of pathogenic microorganisms and viruses can be appropriately used. The filter 33 is disposed on the discharge downstream side of the plug body 34, and the outer peripheral edge portion of the filter is welded to the upper end portion of the plug holder 31.

  The plug 34 is formed in a disk shape with a central portion slightly bulging downward, and is fitted into the fitting portion 31c in a liquid-tight manner. In the present embodiment, the plug 34 is pushed into the fitting portion 31c from above, so that the plug 34 is not detached from the fitting portion 31c due to a slight increase or vibration of the bottle internal pressure during bottle storage or transportation. A fitting force is generated. In the present embodiment, the elastic support portion 35 that supports the plug body 34 is integrally formed with the plug body 34 to form one plug member. The elastic support portion 35 biases the plug body 34 fitted in the fitting portion 31c upward (in a direction in which the plug body 34 is detached from the fitting portion 31c), and the plug body 34 is detached upward from the fitting portion 31c. After that, the plug body 34 is supported at the disengaged position, that is, the position where the plug body 34 is spaced upward from the fitting portion 31c. The urging force by the support portion 35 is made smaller than the fitting force.

  More specifically, as shown in FIG. 3, the plug member having the elastic support portion 35 and the plug body 34 of the present embodiment is made of a molded product having elasticity such as polyethylene, polypropylene using a metallocene catalyst, and an elastomer. The elastic support portion 35 includes a cylindrical base portion 35a fitted in and attached to an attachment recess at the upper end portion of the plug holder 31, and a pair of front and rear semicircular arc-shaped elastic connections for connecting the base portion 35a and the plug body 34. The part 35b is integrally formed. The outer diameter of the plug body 34 is smaller than the inner diameter of the base portion 35a, and the content liquid that uniformly flows out from the periphery of the plug body 34 detached from the fitting portion 31c passes through the inner peripheral portion of the base portion 35a and enters the filter 33. It is designed to flow towards. Note that the number or strength of the elastic connecting portions 35b is not limited to the number of the elastic connecting portions 35b as long as the plug body 34 is maintained at a position separated from the fitting portion 31c.

  According to the eye drop container 1 according to the embodiment, before the first discharge, the discharge passage in the plug 3 is reliably closed by fitting the plug body 34 into the fitting portion 31c as shown in FIG. Even if the liquid agent has high permeability, it can be surely prevented from oozing out from the plug 34 to the downstream side, and the occurrence of an air lock caused by the filter 33 getting wet can be prevented.

  When the first discharge is performed, the bottle body is squeezed to close the introduction hole with a finger or the like while the container 1 is inverted, and the internal pressure of the inner layer bag 22 is increased by the internal pressure. As shown, the plug 34 is pushed up from the fitting portion 31c. At this time, since the pushing-up force of the plug body 34 is assisted by the elastic connecting portion 35b, a smooth initial discharge operation can be performed. Further, at the time of the first discharge, the air between the filter 33 and the plug 34 is pushed out by the content liquid from the filter 33 which is still in a dry state, and thereafter, it is filled with the content liquid until just below the filter 33. Thus, the filter 33 is always wet by the liquid content.

  During the second and subsequent discharges, since the inner layer bag 22 is always in communication with the filter 33, the squeeze force of the bottle body for discharge is reduced, and a smooth discharge operation can be performed. . Further, since the outside air cannot pass through the wet filter, the outside air is not introduced upstream of the filter after the second time, and the discharge failure due to the occurrence of the air lock state does not occur. Furthermore, since the liquid agent remaining in the downstream side of the filter 33, that is, in the discharge nozzle portion 3a is sucked back to the upstream side of the filter 33 due to the restoring property of the inner layer bag 22, the propagation of bacteria in the nozzle portion 3a can be prevented.

  FIGS. 4-6 has shown the discharge container 1 with a filter concerning 2nd Embodiment of this invention, about the structure similar to the said 1st Embodiment, attaches | subjects the same code | symbol and abbreviate | omits detailed description, A different structure The effect will be described.

  In the present embodiment, the plug body 34 is formed of an elastic material such as silicon rubber, chlorinated butyl rubber, or elastomer, and includes a plug flange 35a (base portion) and a connector sleeve 35b (elastic connection portion) constituting the elastic support portion 35. A plug head 34 constituting the plug 34 is integrally formed. The plug flange 35a is substantially ring-shaped, and the cross-sectional shape is substantially triangular so that the thickness increases toward the outer side in the radial direction. The connector sleeve 35b is substantially cylindrical, and one end in the axial direction is integrally connected to the inner peripheral edge of the plug flange 35a, and the other end in the axial direction is integrally connected to the outer peripheral edge of the plug head 34. Further, the connector sleeve 35b has a relatively thin and flexible structure so that it can be easily deformed. Further, as shown in FIG. Yes. The state shown in FIG. 5 is the initial shape of the connector sleeve 35b. As a matter of course, the plug head 34 is not provided with a cross-shaped orifice as described in Patent Document 2.

  Further, the content liquid outlet 31b of the valve holder 31 is formed so that the inner surface of the upper end portion gradually becomes smaller in diameter toward the upper side, and the fitting hole portion 31c (fitting portion) is configured by the minimum diameter portion. Then, the plug head 34 is fitted into the fitting hole 31c from above in a liquid-tight manner. In addition, when the plug head 34 is spaced upward from the fitting hole 31c, the content liquid can be discharged from the outer periphery of the plug head and the plug flange to the filter 33 above the fitting hole 31c. As shown in FIG. 6, at least one flow groove 31 d is provided at a predetermined position in the circumferential direction on the inner peripheral surface of the valve holder 31. In the illustrated example, the liquid content is uniformly distributed over the entire circumference of the plug head 34. Eight flow grooves 31d are formed at equal intervals in the circumferential direction so as to flow out. This circulation groove 31d is formed in a substantially L-shaped longitudinal section.

  Furthermore, in this embodiment, in order to more reliably support the state in which the plug head 34 is separated from the fitting hole 31c, the inner surface of the lower side portion of the side wall of the L-shaped flow groove 31d is pushed up by the content liquid. The plug head 34 may be configured to be fitted or locked. According to such a configuration, the plug head 34 is reliably supported at a position spaced upward from the fitting hole 31c. . Of course, the plug head 34 may be supported at a position disengaged upward from the fitting hole 31c only by the elastic restoring force of the connector sleeve 35b.

  Also in the container 1 according to the present embodiment, before the first discharge, as shown in FIG. 4, the plug head (plug body) 34 is fitted into the fitting portion 31 c to prevent the content liquid from oozing out reliably. After the second discharge, the plug head 34 is supported at the disengaged position as shown in FIG. 5, so that the content liquid can be discharged with a light squeeze force.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed in design. For example, the plug body may be formed of a spherical member without providing the base portion and the elastic connection portion. The present invention can be applied to various dropping containers other than eye drops containers and other discharge containers. The third embodiment shown in FIGS. 7 to 9 and the fourth embodiment shown in FIGS. 10 to 12 are suitably used as a stopper structure of a liquid container for cosmetics such as shampoos and rinses, and these embodiments. Then, the bottle 2 of the container has a single-layer structure, and no filter as in the first and second embodiments is provided. Hereinafter, the same reference numerals are given to the same structures as those in the above-described embodiment, and detailed description thereof is omitted, and different configurations and operational effects will be described.

  In the plug structure according to the third embodiment, a hinge cap 36 is provided on the upper portion of the cover 32 so as to be openable and closable. By closing the hinge cap 36, the discharge nozzle portion 3a can be closed. However, since the closure by the hinge cap 36 is not certain, conventionally, when the hinge cap is employed, the outer periphery of the hinge cap 36 is shrink-wrapped or the container mouth is sealed with an aluminum packaging material. Sometimes it was removed by the user. In this embodiment, before use, the discharge passage can be reliably sealed inside the spout 3 by the plug 34 as shown in FIG. 7, and the bottle body is first squeezed as shown in FIG. 8 at the start of use. By raising the internal pressure of the container and detaching the plug body 34 from the fitting portion 31 c, the discharge path in the plug 3 is always opened, and thereafter, it can be used only by opening and closing the hinge cap 33.

  In the spigot structure according to the fourth embodiment, the entire top portion of the cover 32 is configured as the discharge nozzle portion 3a, and the cap 4 covering the discharge nozzle portion 3a is detachably attached to the cover 32. Others are the same as those in the third embodiment, and thus detailed description thereof is omitted.

  FIG. 13 shows an eye drop container 1 according to a fifth embodiment of the present invention. The same components as those in the fourth embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different configurations and operational effects are shown. explain.

  In the eye drop container 1 according to the fifth embodiment, the body portion of the bottle 2 is formed in a bellows shape, and can be expanded and contracted in the axial direction thereof. Moreover, the bottom part of the bottle 2 is formed in a cup shape having a smaller diameter than the bellows-like part of the body part. Further, the body of the bottle 2 is covered on the outer peripheral side by a bottomed cylindrical exterior body 21, and the bottom of the bottle 2 is projected outward from an opening provided in the bottom plate of the exterior body 21. Yes. In addition, the exterior body 21 is detachably attached to the bottle 2, and when applying a strong compressive force to the inside of the bottle 2 in order to detach the stopper body 34 from the fitting portion 31c, the exterior body 21 is removed. The bellows-like bottle 2 can be greatly compressed and deformed by being removed from the bottle 2. On the other hand, after the stopper 34 is detached, the exterior body 21 is attached to the bottle 2 and the bottom of the bottle is projected from the opening of the bottom plate of the exterior body 21, so that a constant compressive force can be obtained by pushing the bottom of the bottle. It can be generated inside the bottle, and a predetermined amount of dropping operation can be performed stably.

DESCRIPTION OF SYMBOLS 1 Container 2 Bottle 3 Plug 3a Discharge nozzle 3b Holding part 31 Plug holder 31c Fitting part 32 Cover 33 Filter 34 Plug body 35 Elastic support part

Claims (2)

In a stopper for a liquid container comprising a stopper holder that is attached to a mouth portion of a liquid container and has a discharge passage for content liquid, and a stopper member that is held by the stopper holder, the stopper member is attached to the stopper holder. A base, a plug provided in the discharge passage, and an elastic connection portion that elastically connects the plug and the base, and is fitted into a middle portion of the discharge path of the plug holder by fitting. A fitting part for fitting the plug so as to close the discharge path and be pushed out of the fitting part by the increased internal pressure of the liquid container is provided,
The elastic connection portion is configured to support the plug body at a position spaced from the fitting portion in a state where the base portion is attached to the plug holder, and the plug body is fitted with a predetermined fitting force. A stopper for a liquid container, characterized in that the stopper is allowed to be pushed upstream until it is fitted into a joint . 2. The stopper of the liquid container according to claim 1, wherein the predetermined fitting force is such that a bursting vibration is generated when the stopper is detached from the fitting portion due to an increased internal pressure of the liquid container. A cap for a liquid container, characterized by having a fitting force of

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