JP5090726B2 - Container mouth closing mechanism - Google Patents

Description

  The present invention relates to a container mouth closing mechanism comprising a combination of a cylindrical mouth provided in a container body and a cap for closing the cylindrical mouth.

  A container having a cylindrical mouth portion functioning as a content outlet (pour port) and a cap for closing the cylindrical mouth portion is widely used as a container for storing liquid beverages, liquid foods, seasonings and the like. It is used. In such a container, when the mouth is closed only by fitting the cap and the cylindrical mouth, there is a concern that the contents may leak due to poor molding or scratching of the fitting. In addition, when a retort process is performed in which the contents are filled in a container and the container is sealed and then sterilized by heating at high temperature, the contents may leak due to an increase in pressure in the container during the retort process. Furthermore, if there is a difference in the shrinkage / expansion rate between the cap and the cylindrical mouth portion due to the retort process, the mouth portion is not sufficiently closed by the cap, and the contents may leak.

  Conventionally, in order to improve the sealing performance of a container provided with this cylindrical mouth portion, it has been performed to seal the mouth portion using an inner seal material that can be bonded to the mouth portion. However, in order to take out the contents from the container sealed with the inner seal material, the cap must first be opened, and the inner seal material adhered to the mouth portion must be peeled off from the mouth portion. It took.

  Therefore, a container has been proposed in which the inner seal material is peeled off from the mouth at the same time as opening the cap. For example, in Patent Document 1 and Patent Document 2, the inner seal material is bonded to both the mouth portion and the cap inner surface, and the adhesive force between the inner seal material and the cap inner surface is greater than the adhesive force between the inner seal member and the mouth portion. A sealing device is described in which, when the cap is opened, the inner seal member is automatically peeled off from the mouth while maintaining the adhesive state with the inner surface of the cap when the cap is opened.

Japanese Utility Model Publication No. 49-26614 JP 2004-83080 A

  However, as in Patent Document 1 and Patent Document 2, a large force is required to generate a shearing force at the interface between the mouth portion and the inner seal material by the rotation of the cap and to peel the inner seal material from the mouth portion. There is a problem.

  The present invention has been accomplished in view of the above circumstances, and the inner seal material is removed from the mouth at the same time as opening the cap with a small force, compared to the method of peeling the inner seal material by shearing force due to rotation of the cap. An object of the present invention is to provide a container mouth closing mechanism that can be peeled off.

The container mouth closing mechanism of the present invention is a container mouth closing mechanism comprising a combination of a cylindrical mouth provided in a container body and a cap for closing the cylindrical mouth,
The cap has a cylindrical shape that covers a side surface of the cylindrical mouth portion, and has a screw portion that is screwed into an inner surface of the cylindrical shape with a screw portion provided on an outer surface of the cylindrical mouth portion, A cap body capable of moving up and down while rotating along the side surface of the cylindrical mouth portion, a cap upper cover covering the upper end opening of the cylindrical mouth portion and closing the cylindrical mouth portion,
The cap main body and the cap upper lid are mutually independent members that can rotate the cap main body without rotating the cap upper lid, and are fitted to each other so as not to separate,
When the cap main body is rotated along the side surface of the cylindrical mouth portion and moved toward the upper end of the cylindrical mouth portion, the cap main body is slidably engaged with the cap upper lid, and the cap upper lid is engaged. The cylindrical mouth is opened by pushing up,
When the cap body is rotated along the cylindrical mouth portion and moved toward the lower end of the cylindrical mouth portion, the cap body engages with the cap upper lid, and the cap upper lid is pulled down so that the cylindrical mouth portion is moved. Is sealed,
In a state in which the cap body seals the cylindrical mouth portion, the engagement surface of the cap upper cover that engages with the engagement surface of the cap body has a cut surface that becomes lower on the peripheral side of the cap upper cover. A notch is provided.

  The container mouth closing mechanism according to the present invention is configured such that when the cap body is rotated along the side surface of the cylindrical mouth portion and moved toward the upper end of the cylindrical mouth portion, the cap body, the cap upper lid, A force in the upper end direction of the cylindrical mouth portion acting on the engaging surface with which the cap is engaged pushes up the cap upper lid to open the cylindrical mouth portion (typically, the cap upper lid and the cylindrical mouth portion It is used as a force to unbond. At this time, the cap main body rotates while sliding with respect to the engagement surface with the cap upper lid, and pushes up the cap upper lid, so that even if the cap main body and the cylindrical mouth portion are bonded, the bonding surface Almost no shear force is generated. Therefore, according to the present invention, it is possible to rotate the cap body with a small force as compared with the conventional cap that releases the bond between the cap and the mouth by generating a shearing force on the bonding surface between the mouth and the cap. It is possible to open the cap easily.

  Further, since the cylindrical mouth portion can be resealed by the cap, the cap main body and the cap upper lid are fitted to each other so as not to be separated, and the cap main body is disposed along the cylindrical mouth portion. When the cap is rotated and moved toward the lower end of the cylindrical mouth, the cap main body engages with the cap upper lid, so that the cap upper lid is pulled down and the cylindrical mouth can be resealed.

  Further, in a state where the cap body seals the cylindrical mouth portion, a notch having an inclined surface which is lowered on the peripheral side of the cap upper lid on the engagement surface of the cap upper lid engaged with the engagement surface of the cap main body Since the portion is provided, drainage from the gap between the cap body and the cap upper lid to the outside is excellent, and it is difficult for water to collect in this portion.

From the viewpoint of sealing performance of the cylindrical mouth portion, it is preferable that the upper end surface of the cylindrical mouth portion and the cap upper lid are bonded.
At this time, the form of adhesion between the upper end surface of the cylindrical mouth portion and the cap upper lid is not particularly limited, but from the viewpoint of sealing performance and ease of opening, the cap upper lid is connected to the upper end surface of the cylindrical mouth portion. It is preferable that the contact surface has an inner seal material, and the cylindrical mouth portion and the cap upper lid are bonded to each other through the inner seal material.

  When the cap body is rotated along the side surface of the cylindrical mouth portion and moved in the upper end direction of the cylindrical mouth portion, an engagement surface that engages the cap body and the cap upper lid is configured to disengage the cap body. When it is configured so that it does not contact at all when it is rotated along the side surface of the cylindrical mouth and moved to the lowermost side, the force required at the start of cap rotation is reduced, and the cap opening property is improved. Can be made.

Further, since the cap main body concentrates the force that pushes up the cap top cover in one place, the cap can be easily opened, so the cap main body is rotated along the side surface of the cylindrical mouth portion, and the cap main body is rotated. It is preferable that a convex portion is provided on one of the opposing engagement surfaces at a position where the cap main body and the cap upper lid engage when moving in the upper end direction of the cylindrical mouth portion.
In addition, from the viewpoint of high drainability, the engagement surface of the cap upper lid provided with the notch portion is more than the outer diameter R1 of the cap upper lid at a portion where the notch portion is not provided. It is preferable that the outer diameter R2 of the cap upper lid at the portion where the notch is provided is smaller.

The manufacturing method of the cap constituting the container mouth closing mechanism of the present invention is not particularly limited. For example, the step of integrally molding a molded body in which the cap main body and the cap upper lid are connected by a breakable thin portion. And a step of fitting the cap upper lid and the cap main body simultaneously with breaking the thin portion by pressing the cap upper lid toward the cap main body.
Moreover, the container of this invention comprises the closing mechanism of the container opening part of the said invention.

The container mouth closing mechanism provided by the present invention caps the cap body from the cylindrical mouth to the upper end of the cylindrical mouth when the cap and the cylindrical mouth are unscrewed. The cap is opened using the force for separating the upper lid and releasing the adhesion between the cap and the mouth, and almost no shearing force is generated on the adhesion surface between the cap upper lid and the cylindrical mouth. Therefore, when rotating the cap, the cap and the mouth are unbonded by the shearing force generated at the interface between the cylindrical mouth and the cap, and the container can be easily operated with a small force compared to the conventional closing mechanism that opens the cap. Can be opened.
Further, the closing mechanism of the present invention has a structure in which the cap body and the cap upper lid are separated but connected, and the cylindrical mouth portion of the container body can be resealed, and the cap body and Since the cap top lid is separated, a gap is formed between the two members, and drainage from the gap is good.

The container mouth closing mechanism of the present invention is a container mouth closing mechanism comprising a combination of a cylindrical mouth provided in a container body and a cap for closing the cylindrical mouth,
The cap has a cylindrical shape that covers a side surface of the cylindrical mouth portion, and has a screw portion that is screwed into an inner surface of the cylindrical shape with a screw portion provided on an outer surface of the cylindrical mouth portion, A cap body capable of moving up and down while rotating along the side surface of the cylindrical mouth portion, a cap upper cover covering the upper end opening of the cylindrical mouth portion and closing the cylindrical mouth portion,
The cap main body and the cap upper lid are mutually independent members that can rotate the cap main body without rotating the cap upper lid, and are fitted to each other so as not to separate,
When the cap main body is rotated along the side surface of the cylindrical mouth portion and moved toward the upper end of the cylindrical mouth portion, the cap main body is slidably engaged with the cap upper lid, and the cap upper lid is engaged. The cylindrical mouth is opened by pushing up,
When the cap body is rotated along the cylindrical mouth portion and moved toward the lower end of the cylindrical mouth portion, the cap body engages with the cap upper lid, and the cap upper lid is pulled down so that the cylindrical mouth portion is moved. Is sealed,
In a state in which the cap body seals the cylindrical mouth portion, the engagement surface of the cap upper cover that engages with the engagement surface of the cap body has a cut surface that becomes lower on the peripheral side of the cap upper cover. A notch is provided.

Hereinafter, the closing mechanism of the present invention will be described with reference to FIGS.
1 to 3 are cross-sectional views showing an embodiment of a closing mechanism for a container mouth portion composed of a combination of a cylindrical mouth portion and a cap for closing the tubular mouth portion, to which the present invention is applied. 1 is a view showing a state in which the cylindrical mouth portion 1 is closed by a cap 5, FIG. 2 is a view showing only the cap of the closing mechanism in FIG. 1, and FIG. 3 is only a cylindrical mouth portion of the closing mechanism in FIG. FIG. However, in FIG. 1 to FIG. 3, the notch portion 21 (see FIG. 4) for improving drainage is omitted.
10 is a front view (10A) and a side view (10B) showing one embodiment of the content take-out device 101 to which the closing mechanism of FIG. 1 is applied, and FIG. 11 shows the content take-out device 101 in FIG. It is a figure which shows the example of 1 form of the attached container.

  In the present invention, the container having the cylindrical mouth portion is not limited to the one shown in FIG. 11, and the material may be made of paper, resin, metal, or a combination of these materials. The tube type, bottle type, bag type and the like are not particularly limited. Moreover, the cylindrical mouth part provided in a container main body should just be cylindrical and can be closed by a cap, and may be integral with a container main body, or may not be integral. Further, the cylindrical mouth portion is not limited to the content take-out device as shown in FIG. 10, and may be a mouth portion having a structure attached as a general tube or bottle spout (injection port).

In FIG. 10, the content take-out device 101 includes a cylindrical mouth portion 1, a conduit portion 2, a straw portion 4 including at least a pair of joint portions 3 projecting left and right at the upper end of the conduit portion 2, and the cylindrical mouth portion 1. And a cap 5 for closing. As shown in FIGS. 1 and 3, the cylindrical mouth portion 1 has a screw portion (this embodiment) that can be engaged with a screw portion (screw groove in this embodiment) 20 provided on the cap 5 (cap body 12). Is threaded) and is closed by being screwed onto the cap 5. When the container is not opened, the upper end opening portion 1c of the cylindrical mouth portion 1 is bonded to the disk portion (cap upper lid 13) of the cap 5 via the inner seal material 19 on the upper end surface 1b. It is kept high.
Moreover, the longitudinal groove 12b etc. which become a slip stopper may be provided in the outer surface of the side part of the cap 5 (cap main body 12).

The straw portion 4 is usually formed by injection molding a plastic material such as polyethylene such as high density polyethylene (HDPE) or polypropylene in terms of adhesion to the cap lid or inner seal material. There is no particular limitation, and materials other than plastic may be used.
The cylindrical mouth portion 1 has a support flange 7 for suspending the content take-out device 101 during the manufacturing process of the container, an alignment rib 8 for aligning the content take-out device 101 lifted through the support flange 7, and the like. It may be provided. Further, the upper end flange 9 and a content outlet hole 10 for efficiently filling or removing the content may be formed in the conduit portion 2.

  For example, as shown in FIG. 11, the content take-out device 101 joins the upper opening of the container main body 11 made of a gusset bag made of a flexible laminated film and the joint 3 of the content take-out device 101. Can be used. When taking out the contents from this container, the cap 5 and the cylindrical mouth part 1 are unscrewed, the cap 5 is opened, and the cylindrical mouth part 1 is used as a spout. As shown in FIG. 11, when the tip of the conduit portion 2 reaches the vicinity of the bottom portion of the container body 11, the content take-out device 101 can be used as a straw, and a mouth is attached to the cylindrical mouth portion 1. Can suck up the contents.

As shown in FIGS. 1 and 2, the cap 5 that is screwed into the cylindrical mouth portion 1 and closes the cylindrical mouth portion 1 includes a cap body 12 and a cap upper lid 13.
The cap body 12 has a cylindrical shape that covers the side surface 1 a of the cylindrical mouth portion 1, and has a screw portion 20 that can be engaged with the screw portion 6 of the cylindrical mouth portion 1 on the inner surface of the cylindrical shape. . The cap body 12 can be moved up and down (in the direction of the arrow in FIG. 1) while rotating along the side surface 1a of the cylindrical mouth portion 1 by screwing with the cylindrical mouth portion 1. The structure is detachable from the portion 1. On the other hand, the cap upper lid 13 covers the upper end opening 1 c of the cylindrical mouth portion 1 and closes the cylindrical mouth portion 1.

In the present invention, the cap main body and the cap upper lid are “independent members” and “fitted together so as not to be separated” means that the cap main body 12 can freely rotate with respect to the cap upper lid 13. It means the state connected by.
As shown in FIGS. 1 and 2, the cap main body 12 and the cap upper lid 13 constituting the cap 5 are members separated from each other, but have a structure in which the cap upper lid 13 is fitted inside the cap main body 12. The cap body is connected to the cap upper lid in a freely rotatable state.
On the inner surface of the upper end portion of the cap main body 12, a convex portion that forms an engagement surface 12 c with the cap upper lid 13 is formed. When the cap main body 12 is rotated along the side surface 1a of the cylindrical mouth portion 1 and moved in the upper end direction (upper end surface side) of the cylindrical mouth portion 1, the cap main body 12 and the cap upper lid 13 are engaged with the engaging surface 12c. 13c, and the cap upper lid 13 is pushed up by moving the cap body 12 toward the upper end of the cylindrical mouth portion 1.

  By pushing up the cap upper lid 13 by the cap body 12, the cap upper lid 13 is separated from the upper end opening 1c of the cylindrical mouth portion 1, and the cylindrical mouth portion 1 is opened. At this time, when the upper end surface 1 b of the cylindrical mouth portion 1 and the cap upper lid 13 are bonded, the cap main body 12 pushes the cap upper lid 13 from the upper end surface 1 b of the cylindrical mouth portion 1 by the force pushing up the cap upper lid 13. 13 peels, the cylindrical mouth is opened, and the container is opened (see FIGS. 7 and 8).

In the above-described opening operation, the cap body 12 has a structure that can freely rotate with respect to the cap upper lid 13. Therefore, even after the cap main body 12 and the cap upper lid 13 are engaged, While sliding (sliding) with respect to the engagement surface of the cylindrical mouth portion 1, it can rotate around the axis of the cylindrical mouth portion 1, moves toward the upper end of the cylindrical mouth portion 1, and pushes up the cap upper lid 13.
Therefore, even when the cylindrical mouth portion 1 and the cap upper lid 13 are bonded, when the cap main body 12 pushes up the cap upper lid 13 as described above, the cap main body 12 slides on the engaging surface with the cap upper lid 13. Therefore, almost no shearing force is generated on the bonding surface between the cap upper lid 13 and the cylindrical mouth portion 1. Therefore, the resistance in the shearing direction is not as great as in Patent Document 1 and Patent Document 2, and the cap body 12 can be rotated with a small force. Then, by rotating the cap body 12, the cap upper lid 13 is pushed up in a direction perpendicular to the adhesive surface between the cap upper lid 13 and the cylindrical mouth portion 1, and the cap upper lid 13 is moved without generating a shearing force on the adhesive surface. It can be peeled off from the cylindrical mouth portion 1.

  As described above, the container mouth portion closing mechanism according to the present invention rotates the cap body along the side surface of the cylindrical mouth portion and moves the cap body and the cap upper lid when moving the cap body toward the upper end of the cylindrical mouth portion. The force in the upper end direction of the cylindrical mouth that acts on the engagement surface that engages with the cap pushes up the cap upper lid to open the cylindrical mouth (typically, bonding between the cap upper lid and the cylindrical mouth It is used as power.

  By pulling the cap top lid adhered to the upper end surface of the cylindrical mouth portion away from the cylindrical mouth portion in a direction perpendicular to the adhesive surface between the cap top lid and the cylindrical mouth portion, the cylindrical mouth portion and the cap top lid The force required to unbond the cap is compared with the force required to unbond the cap and the mouth by rotating the cap and generating a shearing force on the bonding surface of the mouth and the cap. Small and easy to open cap.

  That is, according to the present invention, in a conventional container that opens a container by a shearing force, it is possible to close the cylindrical mouth portion with a high adhesive force that makes it difficult to open the cap. A container excellent in sealing performance can be provided. Alternatively, it is possible to provide a container excellent in easy-openability that can be opened with a small force while maintaining the sealability when not opened.

  In the present invention, the cap upper lid closes the cylindrical mouth portion means that the cap upper lid covering the upper end opening of the cylindrical mouth portion is bonded to the cylindrical mouth portion, as well as the cap upper lid. A state in which the cap top lid is fixed to the upper end opening of the cylindrical mouth portion by a method other than adhesion without bonding the cylindrical mouth portion to the cylindrical mouth portion is also included. For example, it includes a state in which a cap upper lid made of a material having excellent adhesion such as rubber is attached so as to surround the outer periphery of the upper end surface of the cylindrical mouth portion, and the cylindrical mouth portion is sealed.

  In the present embodiment shown in FIGS. 1 to 3, the cap upper lid 13 and the cylindrical mouth portion 1 are arranged on the contact surface 14 with the upper end opening 1 c of the cylindrical mouth portion of the cap upper lid 13. 19, the cap upper lid and the cylindrical mouth when the container is not opened keeps the sealing performance when the container is not opened, and the cap upper lid is pushed up by the cap body, so that the cylindrical mouth If it is a form which can peel a cap top cover from, it will not specifically limit. For example, the cap upper lid and the upper end surface of the cylindrical mouth portion may be directly welded, or the cap upper lid and the upper end surface of the cylindrical mouth portion may be bonded with an adhesive. From the viewpoint of ensuring sealing performance when unopened and easy opening when opening the cap, the cap upper lid and the cylindrical mouth are provided via an inner seal material arranged on the contact surface with the cylindrical mouth portion of the cap upper lid. It is preferable that the part is bonded.

  As an inner seal material, the upper end opening of the cylindrical mouth is covered, and when the container is not opened, the contact surface of the cap upper lid and the upper end of the cylindrical mouth are adhered to maintain the airtightness in the container. It is possible to use an adhesive that can be easily peeled off from the upper end surface of the cylindrical mouth portion when the cap is opened, but does not peel off from the cap upper lid. By adhering the cap top lid and the cylindrical mouth portion through such an inner seal material, the cap is opened with a small force while maintaining the sealing performance at the unsealed cylindrical mouth portion, and at the same time The inner seal material can be peeled off from the cylindrical mouth portion.

At this time, in order to ensure that the inner seal material is peeled off from the cylindrical mouth portion 1 simultaneously with the opening of the cap, the adhesive strength per unit area or unit length between the inner seal material and the cap upper cover is determined by the inner seal material. It is preferable that the adhesive strength per unit area or unit length between the cylindrical mouth portions is larger.
The adhesive strength per unit area or unit length between the inner seal material / cap upper lid is equal to the adhesive strength per unit area or unit length between the inner seal material / cylindrical mouth, or the inner seal material. / Even if it is smaller than the adhesive strength per unit area or unit length between the cylindrical mouth parts, the inner seal material is shaped so as to cover the entire upper end opening of the cylindrical mouth part, and is bonded to the cap top cover and the entire surface If this is done, the inner sealing material is usually stronger than the cap upper lid because the bonding area between the cap top cover and the inner seal material is much larger than the bonding area between the upper end of the cylindrical mouth and the inner seal. It is stuck. Therefore, the inner seal material can be reliably peeled off from the cylindrical mouth portion simultaneously with the opening of the cap.

When it is difficult to directly measure the adhesive strength per unit area or unit length between the inner seal material / cap top lid and between the inner seal material / cylindrical mouth, it is formed of the inner seal material / cap top cover material. The adhesive strength per unit area or unit length between the plate-like members formed between the plate-like members and the inner seal material / cylindrical mouth material is determined between the inner seal material / cap upper lid and the inner seal material / cylindrical shape. What is necessary is just to employ | adopt as adhesive strength per unit area or unit length between mouth parts, respectively.
As a method for measuring the adhesive strength per unit length between the plate-like members formed of the inner seal material / cap upper cover material and between the plate-like members formed of the inner seal material / cylindrical mouth material, for example, JISZ0238 The method described in “Testing method of heat-sealing soft packaging bag and semi-rigid container” can be used.

  As the inner seal material, various materials can be used, for example, a single layer or multilayer plastic film, a metal film, an inorganic vapor deposition layer, a composite plastic film that optionally includes a paper layer, etc. Generally, a plastic film layer (surface layer) to be welded to the cap lid, an intermediate layer made of a plastic layer, a metal film layer, an inorganic vapor deposition layer, or a laminated film in which a plurality of these are laminated, and a cylindrical mouth portion are welded. A composite film having a heat seal layer (back layer) is used.

  The heat seal layer may be a single layer structure or a multilayer structure in which a plurality of layers are laminated as long as it can be welded to the cylindrical mouth portion 1, and the material is not particularly limited, but an easy peel It is preferable to use a film having a property (easy peel film). The peeling type of the easy peel film is not particularly limited, and may be properly used depending on the shape of the container, sealing conditions, sterilization conditions, etc., such as interfacial peeling, cohesive peeling, and delamination. Examples of the interface peel type easy peel film include a structure in which a support layer made of a polyethylene (PE) film and an adhesive layer containing an ethylene vinyl acetate copolymer (EVA) and an adhesive are laminated, and an easy peel film of a cohesive peel type. As a film, the thing of the structure which laminated | stacked the support layer which consists of PE film or a polypropylene (PP) film, and the aggregation peeling layer containing PP, PE, and another material as needed is mentioned, for example.

  When the container provided with the container mouth closing mechanism according to the present invention is used as a retort pouch, the peeling type of the easy peel film is preferably cohesive peeling or delamination, particularly cohesive peeling. As the structure of the cohesive peeling type easy peel film for the retort pouch, for example, a support layer made of a PP film excellent in heat resistance and an cohesive peeling layer containing PP, PE and other materials as required are laminated. Those are preferred.

  On the other hand, the plastic film layer may be a single layer structure or a multilayer structure in which a plurality of layers are laminated as long as it can be welded to the contact surface 14 of the cap upper lid 13. Examples thereof include unstretched film layers such as polyethylene (LLDPE), unstretched polypropylene (CPP), low density polyethylene (LDPE), and ethylene vinyl acetate copolymer (EVA), or those obtained by laminating these film layers. Similar to the heat seal layer, when a container provided with the closing mechanism of the present invention is used as a retort pouch, it is preferable to use a polypropylene film layer such as CPP having heat resistance.

  The intermediate layer is made of a stretched film layer such as stretched polyethylene terephthalate, stretched polypropylene (OPP), stretched high-density polyethylene (HDPE), stretched nylon (ONY), a metal film layer such as aluminum (Al), or a metal deposition layer. A layer or a stack of a plurality of these layers can be used. When a metal film layer such as aluminum (Al) or a metal vapor deposition layer is provided as an intermediate layer, the metal layer is heated by electromagnetic induction, and the heat seal layer and the upper end surface of the cylindrical mouth and / or Or a plastic film layer and a cap top cover can be welded. From the above viewpoint, the intermediate layer preferably includes a metal layer. Further, the intermediate layer can be provided with a layer capable of imparting functions such as gas barrier properties as necessary.

Specific examples of the inner seal material include the following, but are not limited thereto. In the following examples, the symbol “#” represents the thickness (unit: μm) of the corresponding layer.
Specific example: Plastic film layer [CPP # 30-50] / intermediate layer [Al # 6-30] / heat seal layer [easy peel film # 25-50]

The method of adhering the inner seal material to both the abutting surface of the cap upper lid and the upper end surface of the cylindrical mouth portion and sealing the cylindrical mouth portion is not particularly limited. For example, when manufacturing a cap upper lid, an inner seal material is set at a position to be a contact surface in a cap upper lid mold, and a molten plastic material is injected and filled in the mold, By cooling and solidifying with, the inner seal material and the cap top lid can be bonded and integrated (insert injection method).
In addition, after molding the cap upper lid or after molding the cap in which the cap upper lid and the cap body are fitted, an inner seal material is set at a position to be a contact surface with the cylindrical mouth portion of the cap upper lid, The inner seal material can be welded to the cap top cover by a general method such as heat sealing, high frequency, ultrasonic wave, electromagnetic induction or the like.

  Inner seal material by applying high frequency, ultrasonic waves, etc. in a state where the cap provided with the cap upper lid to which the inner seal material is bonded as described above is completely screwed into the cylindrical mouth portion attached to the container. And the upper end surface of the cylindrical mouth portion can be welded.

  Alternatively, the cap is closed with the inner seal material set in the upper end opening of the cylindrical mouth portion attached to the container, and the inner seal material is removed from the upper end surface of the tubular mouth portion and the cap upper cover by high frequency or ultrasonic waves. It is also possible to weld both at the same time.

  The cap main body and the cap upper cover constituting the cap are independent members that can rotate the cap main body without rotating the cap upper cover, and the cap main body is rotated along the side surface of the cylindrical mouth portion to As long as the cap body is slidably engaged with the cap top cover and moved up toward the upper end of the cylindrical mouth portion, and the cylindrical mouth portion is opened by pushing up the cap top cover, The specific structure of is not particularly limited.

That is, the cap body 12 has a cylindrical shape that covers the side surface 1 a of the cylindrical mouth portion 1, a screw portion 20 that can be screwed to the cylindrical mouth portion 1, and the cap body 12 of the cylindrical mouth portion 1. An engagement surface 12c that can be slidably engaged with the cap upper lid 13 and can be pushed up when rotated along the side surface 1a and moved toward the upper end of the cylindrical mouth portion 1; As long as it has.
On the other hand, the cap top cover 13 can cover the upper end opening 1 c of the cylindrical mouth 1 and close the cylindrical mouth 1, and rotate the cap body 12 along the side surface 1 a of the cylindrical mouth 1. It is only necessary to have an engagement surface 13c that is slidably engaged with the cap body 12 when the cylindrical mouth portion 1 is moved toward the upper end, and the cap upper lid 13 is pushed up.

  As shown in FIGS. 1 and 2, the cap 5 can be closed again by the cap 5 even after the cap upper lid 13 and the cylindrical mouth 1 are unbonded. The cap main body 12 and the cap upper lid 13 are fitted to each other so as not to be separated, and the cap main body 12 is rotated along the cylindrical mouth portion 1 so that the lower end direction of the cylindrical mouth portion (the upper end surface 1b side is It is preferable that the cap main body 12 engages with the cap upper lid 13 and the cap upper lid 13 is pulled down to reseal the cylindrical mouth portion 1 when moving to the opposite side.

  1 and 2, the cap main body 12 and the cap upper lid 13 are the cap upper lid 13 when the cap main body 12 moves along the cylindrical mouth 1 and moves toward the upper end of the cylindrical mouth 1. Engagement that engages with the cap top lid 13 when the cap body 12 moves along the cylindrical mouth part 1 and moves toward the lower end of the cylindrical mouth part together with the engaging surfaces (12c, 13c) to be engaged. It has surfaces (12d, 13d). The cap main body 12 and the cap upper lid 13 are fitted in a fitting portion 17 that forms the engaging surfaces 12c and 13c and the engaging surfaces 12d and 13d, and the cap upper lid 13 is peeled off from the cylindrical mouth portion 1. The cap body 12 and the cap upper lid 13 are connected to each other later.

  Then, when the cap body 12 is rotated along the side surface 1a of the cylindrical mouth portion 1 and moved toward the lower end of the cylindrical mouth portion, the cap body 12 and the cap upper lid 13 are engaged at the engagement surfaces 12d and 13d. Further, the cap upper lid 13 is pulled down by moving the cap body 12 toward the lower end of the cylindrical mouth portion. As a result, the cap top lid 13 comes into contact with the upper end surface 1b of the cylindrical mouth portion 1 again, and the cylindrical mouth portion 1 can be resealed.

  Here, the fitting between the cap body and the cap upper lid is a loose fitting that allows the cap body to rotate freely with respect to the cap upper lid, and prevents rotation along the side surface of the cylindrical mouth portion of the cap body. is not.

  In order to improve the sealing performance at the time of resealing, it is preferable to provide the packing 18. The packing 18 only needs to have a structure that can improve the sealing performance of the cylindrical mouth portion 1. For example, as shown in FIG. 4, it is provided on the contact surface 14 of the cap upper lid 13 and is slightly smaller than the outer diameter of the cylindrical mouth 1 and smaller than the inner diameter so that it can be in close contact with the outer peripheral surface of the cylindrical mouth 1. And a cylindrical shape having a slightly larger inner diameter so that the inner peripheral surface of the packing 18 and the outer peripheral surface of the cylindrical mouth portion 1 are in close contact with each other by screwing the cap 5 and the cylindrical mouth portion 1 ( Outer packing).

Alternatively, although not shown, it has a cylindrical shape that is provided on the contact surface of the cap top lid and has an outer diameter that is slightly larger than the inner diameter of the cylindrical mouth portion 1 so as to be in close contact with the inner peripheral surface of the cylindrical mouth portion 1. However, it is also possible to use an inner packing that enters the inside of the cylindrical mouth portion and is in close contact with the inner peripheral surface of the cylindrical mouth portion by screwing between the cap and the cylindrical mouth portion.
Alternatively, a packing (not shown) that combines the inner packing and the outer packing, is in close contact with the inner peripheral surface and the outer peripheral surface of the cylindrical mouth portion, and seals the cylindrical mouth portion can also be used.

Outer packing is preferable among the packings because it is easy to attach the inner sealing material to the cap upper lid and the configuration of the inner sealing material and packing is not complicated.
The packing can be provided regardless of whether or not an inner seal material is used.

  The cap 5 is an engaging surface on which the cap main body 12 and the cap upper lid 13 are engaged when the cap main body 12 is rotated along the side surface 1a of the cylindrical mouth portion 1 and moved toward the upper end of the cylindrical mouth portion. As shown in FIGS. 1 and 2, (12c, 13c) has a structure that does not contact at all when the cap body 12 is rotated along the side surface 1a of the cylindrical mouth portion 1 and moved to the lowermost side. It is preferable to have (refer FIG. 7A-FIG. 7C).

  In this way, the cap body 12 is positioned at the lowest end of the cylindrical mouth portion 1, that is, the cap body 12 is completely screwed with the tubular mouth portion 1, and the cap body 12 is no longer in the cylindrical mouth portion. 1, when there is a gap between the engagement surface 12 c of the cap body 12 and the engagement surface 13 c of the cap upper lid 13, the cap body 12 is moved in the upper end direction of the cylindrical mouth portion 1. Since the cap body 12 and the cap upper lid 13 are not engaged with each other at the start of the rotation to move to the position, a force for pushing up the cap upper lid 13 is not required, and only a force for starting the rotation of the cap body 12 is required. (See FIG. 7A).

  Depending on the thickness of the thread and the like, the force required for rotation between the two members that are screwed is usually the largest when rotation starts in the direction of opening from the completely screwed state. Therefore, when the cap main body 12 and the cap upper lid 13 are engaged at the start of rotation of the cap main body and a force for pushing up the cap upper lid 13 is required (see FIGS. 8A to 8B), the cap main body 12 is rotated. It takes a relatively large force to get started. On the other hand, when the force necessary for starting the rotation of the cap body 12 is only the force for unscrewing the cap body 12 and the cylindrical mouth portion 1, the cap body 12 can be easily rotated with a relatively small force. Can start.

  Then, the cap body 12 moves along the side surface 1 a of the cylindrical mouth portion 1 while moving in the upper end direction of the cylindrical mouth portion 1, and the engagement surface 12 c of the cap body 12 and the engagement surface 13 c of the cap upper lid 13 are moved. From the point of time when the cap body 12 is engaged, a force for pushing up the cap upper lid 13 is required to rotate the cap body 12 (see FIG. 7B). At this time, the force for rotating the cap body 12 to unscrew the cap body 12 and the cylindrical mouth portion 1 is smaller than that at the start of the rotation of the cap body 12, and thus is relatively small. The cap main body 12 can be rotated by force to push up the cap upper lid 13 (see FIG. 7C).

  In particular, even when the cap upper lid 13 and the cylindrical mouth portion 1 are bonded and a force is required to peel the cap upper lid 13 from the cylindrical mouth portion 1 when the cap upper lid 13 is pushed up, By providing the gap structure as described above between the engagement surface 13c, the cap can be opened easily with a small force.

  An elastic member (not shown) is put in contact with the engagement surface 12c and the engagement surface 13c in the gap between the engagement surface 12c and the engagement surface 13c, and the cap is applied with a weak force at the start of rotation. While allowing the main body to rotate, dust or the like may be prevented from entering between the cap and the cylindrical mouth portion. The elastic member is crushed between the engagement surface 12c and the engagement surface 13c by the movement of the cylindrical mouth portion 1 of the cap body in the upper end direction, and between the engagement surface 12c and the engagement surface 13c. As long as it has the same effect as the case where there is a gap, and the original shape can be restored again by moving the cap body toward the lower end of the cylindrical mouth portion 1, for example, Examples thereof include elastic members such as rubber and ring-shaped members having a bellows structure.

  In addition, as shown in FIG. 8, in the state which rotated the cap main body 12 along the side surface 1a of the cylindrical opening | mouth part 1, and moved to the lowest end side, the engagement surface 12c and the engagement surface 13c engage. In the case of having such a structure, when the cap starts rotating, a force for pushing up the cap and a force for pushing up the cap upper cover are required. Although the cap body cannot be rotated by force, it can be opened with a sufficiently weak force as compared with a conventional cap.

  Although the engagement form of the cap main body 12 and the cap upper cover 13 in the engagement surface 12c and the engagement surface 13c is not particularly limited, the force for pushing up the cap upper cover 13 of the cap main body 12 is concentrated in one place, and the cylindrical mouth portion 1 Since the cap top lid 13 can be more easily peeled off, the following structure is preferable. That is, when the cap body 12 is rotated along the side surface 1a of the cylindrical mouth portion 1 and moved in the upper end direction of the cylindrical mouth portion, the positions at which the cap body 12 and the cap upper lid 13 are engaged are opposed to each other. It is preferable that one convex portion 16 is provided on one of the mating surfaces 12c and 13c (see FIG. 4).

  Thus, when the convex part 16 is provided in one place in either of the engagement surfaces 12c and 13c, the cap top cover 13 is the height of the convex part 16 at the position where the convex part 16 is provided. It is lifted up and tilted obliquely as a whole. At this time, the force for peeling the cap top lid 13 from the cylindrical mouth portion 1 concentrates on the adhesive surface between the cap top lid 13 and the cylindrical mouth portion 1 at the position where the convex portion 16 is provided. From which the cap top lid 13 peels off. Thus, the force required to peel a part of the adhesive surface is smaller than the force required to peel the entire adhesive surface all at once, and the adhesive surface where the starting point of peeling occurs is the starting point. Since the stress concentrates on the surface, peeling of the remaining adhesive surface is likely to proceed. Accordingly, the cap upper lid 13 and the cylindrical mouth portion 1 can be easily peeled off.

  As shown in FIG. 4, when the convex portion 16 is provided on the engaging surface 12 c of the cap main body 12, the convex portion 16 makes contact with the cap upper lid 13 while rotating around the cap main body 12 and pushes up the cap upper lid 13. Therefore, the force for peeling the cap upper lid 13 from the cylindrical mouth portion 1 is gradually applied to the bonding surface between the cap upper lid 13 and the cylindrical mouth portion 1.

  On the other hand, when the convex portion 16 is provided on the engagement surface 13c of the cap upper lid 13 (not shown), the convex portion 16 is not rotated even when the cap body 12 rotates until the cap upper lid 13 is peeled off from the cylindrical mouth portion 1. The cap upper lid 13 is lifted intensively at the position where the convex portion 16 is provided without rotating.

  The vertical movement distance per rotation of the cap body varies depending on the pitch of the screw part provided in the cap body and the cylindrical mouth part. Therefore, the force required to push up the cap top cover by adjusting the thread part pitch. Can also be adjusted. That is, by reducing the pitch of the screw portion and reducing the vertical movement distance per rotation of the cap, the cap can be rotated with a small force, and the cap can be easily opened.

  When the container provided with the closing mechanism of the present invention is retorted, a gap existing in the engaging portion between the cap body and the cap upper lid, for example, the cap body side engaging surface 12c and the cap upper lid side engaging surface 13c in FIG. Since water may accumulate in the gaps between them, there is a sanitary problem. In particular, the configuration shown in FIGS. 1 and 2 is a mechanism in which the cap body and the cap upper lid engage when the cap body is rotated along the side surface of the cylindrical mouth portion of the container body and moved in the upper end direction. The mating surface is preferable in that it can be opened with a weak force because it does not contact at all when the cap body is rotated along the side surface of the cylindrical mouth portion of the container body and moved to the lowermost end. As described above, when the container having such a form of the closing mechanism is retorted, water is likely to accumulate because a gap existing in the engaging portion between the cap body and the cap upper lid is relatively large.

Therefore, the closing mechanism of the present invention exists at or near the engaging portion between the cap body and the cap upper cover in a state where the cap body is rotated along the side surface of the cylindrical mouth portion of the container body and moved to the lowermost end. In order to facilitate the discharge of water that has entered the gap, the following structure is adopted.
That is, as shown in FIG. 4, the closing mechanism of the present invention has a structure in which a cap upper lid 13 is fitted inside the cap body 12, and the cap body extends along the side surface of the cylindrical mouth portion of the container body. A notch portion 21 having an inclined surface 21a that is lowered on the peripheral side of the cap upper lid is formed on the engagement surface 13d of the cap upper lid that engages with the engagement surface 12d of the cap main body in a state where the cap is rotated to the lowermost end. Provide.
The outer diameter of the cap upper lid at the height of the engaging surface 13d of the cap upper lid is smaller in the outer diameter R2 of the portion where the notch portion 21 is provided than the outer diameter R1 of the portion which is not the notch portion. It is preferable. By doing so, the inclined surface 21a ends before the end portion of the cap upper lid that is not a notch, so that a highly drainable opening is formed on the side of the cap upper lid at the end of the inclined surface. The In order to obtain good drainage, the width W of the notch is also adjusted as appropriate.
FIG. 5 is a horizontal sectional view (AA sectional view) at the height of the engaging surface 13d of the cap upper lid used in the example of FIG. In this example, two notches 21 are arranged at an interval of 180 degrees on the engagement surface 13d of the cap upper lid.
In the closed state, the notch portion 21 forms a through path that leads from the engaging surface 13d of the cap upper lid to the side surface 21c below the engaging surface 13d of the cap upper lid. Accordingly, in the closed state, a state in which the recess of the notch is open on the engagement surface, that is, the region of the notch on the engagement surface 13d of the cap upper lid is separated from the engagement surface 12d of the cap body. It will be in the state of protruding. FIG. 4 shows an opening 21b of such a notch recess.
The inclined surface 21a of the notch is typically a flat tapered surface as shown in the drawing, but may be an inclined surface where water flows toward the periphery of the upper lid by the action of gravity. For example, it may be a canyon-shaped inclined surface that is sandwiched between a pair of flat slopes and that falls to the peripheral side of the cap upper lid. The inclination angle is preferably 30 degrees or more, and more preferably 45 degrees or more. The inclination angle is preferably 70 degrees or less, and more preferably 60 degrees or less.
FIG. 6 shows another example of the arrangement of the notches, and the four notches 21 are evenly arranged on the engaging surface 13d of the cap upper lid. The number of notches is not particularly limited, but usually 2 to 6 notches are equally arranged on the engagement surface of the cap upper lid.

  The manufacturing method of the cap which comprises the closing mechanism of this invention is not specifically limited. For example, the cap body and the cap upper lid may be separately molded and assembled (fitted). Alternatively, as shown in FIG. 9, first, the cap body 12 and the cap upper lid 13 are integrally formed with a breakable thin portion, and the cap upper lid 13 is pressed against the cap body side, The cap upper lid 13 and the cap main body 12 may be fitted simultaneously with breaking the thin wall portion.

  When the cap body and the cap top cover are formed using different materials, a method of forming the cap body and the cap top cover separately may be employed, and the cap body and the cap top cover are formed using the same material. In such a case, it is preferable to adopt an integral molding method because the assembling work between the cap body and the cap upper lid becomes easy.

As a material for forming the cap body, any material may be used as long as it is rigid so that it is not greatly deformed by the force applied to the cap body when the cap is opened. For example, polyethylene such as HDPE, polypropylene and the like can be mentioned.
On the other hand, as a material for forming the cap upper lid, any material having a strength capable of maintaining the closed state of the cylindrical mouth portion may be used, and can be appropriately selected and used. Further, when the cap upper lid and the cylindrical mouth portion are bonded via the inner seal material, a material that can be welded to the inner seal material, or the cap upper lid and the cylindrical mouth portion 1 are directly bonded. In the case of making it, it is preferable to use a material that can be welded to the cylindrical mouth portion. Examples thereof include polyethylene (such as HDPE) and polypropylene.

  When used as a cap for a container (retort pouch) to be sterilized by retort, it is preferable to use heat-resistant polypropylene or the like for both the cap body and the cap lid.

[Production of content take-out device]
As shown in FIG. 10, the contents take-out devices of Examples and Comparative Examples having a basic structure of a cap and a straw part were produced. However, the cylindrical mouth portion and the cap of the straw portion have a structure as shown in FIG. 12 (Example) and FIG. 13 (Comparative Example).

(Example)
First, a cap body (made of PP) and a cap top cover (made of PP) are manufactured separately, and an inner seal material (in order from the cap top cover side: polypropylene film (30 μm) // Al (7 μm) // ONY (15 μm) ) // Easy peel film (30 μm)) was thermally welded, and then the cap upper cover was fitted into the cap body to produce the cap of the example (see FIG. 12).
The gap between the engagement surfaces of the cap body and the cap upper lid was set to 0.5 mm at the maximum. As the cap upper lid, the outermost diameter of the uppermost part is φ14 mm, and two notches 21 as shown in FIG. 4 are provided at intervals of 180 degrees on the engaging surface 13d with the cap body in the sealed state. The outer diameter R1 of the portion that is not a notch at the height of the mating surface 13d is φ11.9 mm, the outer diameter R2 of the portion provided with the notch 21 is φ9.36 mm, the width W of the notch 21 is 2 mm, and The inclined surface 21a has an angle θ (see FIG. 4) of 45 degrees.
Next, the cap is fastened to the cylindrical mouth portion (made of PP, inner diameter 8.5 mm, outer diameter 10.7 mm), and the inner seal material and the cylindrical mouth portion are welded at a high frequency to obtain a cap as shown in FIG. A content take-out device comprising a straw section was produced.

(Comparative Example 1)
First, an inner sealing material (in order from the cap side: polypropylene film (30 μm) // Al (7 μm) // ONY (on the cap side) is formed on the upper end surface of the cylindrical mouth (PP, inner diameter 8.5 mm, outer diameter 10.7 mm). 15μm) // Easy peel film (30μm)), cap (PP, outer diameter 16mm) is fastened to the cylindrical mouth, and the inner seal material is sandwiched between the upper end surface of the cylindrical mouth and the cap It is.
Next, the inner seal material was welded to both the cap and the cylindrical mouth portion by high frequency to produce a content take-out device comprising a cap and a straw portion as shown in FIG.

(Comparative Example 2)
A cap that is basically the same as the cap of the example (FIG. 12) but does not have a notch 21 (see FIG. 4) for draining water on the cap upper lid was produced.
Next, the above-described cap is fastened to the cylindrical mouth portion used in the example, and the inner seal material and the cylindrical mouth portion are welded at a high frequency, and a contents take-out device comprising a cap and a straw portion as shown in FIG. Produced.

[Opening torque measurement]
The maximum opening torque of the contents extracting device of the example shown in FIG. 12 and the contents extracting device of the comparative example 1 shown in FIG. 13 was measured using a digital opening torque meter (manufactured by Nidec Symposium). .

  The opening torque of the content take-out device of the comparative example in which shearing force is generated on the bonding surface between the inner seal material and the cylindrical mouth portion by the rotation of the cap and the inner seal material is peeled off from the cylindrical mouth portion is 98 N · cm. was. On the other hand, the opening torque of the content take-out device of the example to which the closing mechanism of the present invention was applied was 35 N · cm. From this result, it was found that the embodiment to which the present invention was applied can open the cap with a force of about one third or less of the opening torque of the comparative example. That is, the content take-out device of the embodiment is excellent in the storage stability of the content and the easy opening of the container.

[Drainability of water from between the cap body and cap top cover]
About the content extraction apparatus of the Example shown in FIG. 12, and the content extraction apparatus of the comparative example 2 which is the same as that of the Example in appearance, but does not have the notch part for draining water, it discharges | emits water Sex was tested.
The content extraction device was sterilized under pressure and heat (retort) (121 ° C., 30 minutes) and then placed at room temperature (25 ° C. ± 5 ° C.) with the cap on top. Immediately after the retort treatment, water was collected in the gap between the cap upper lid and the cap body in both of the content take-out devices of the example and the comparative example 2, but the example had less water. In addition, the content take-out device of Comparative Example 2 was dried after two days from the start of standing at room temperature, and the moisture was lost, whereas the content take-out device of the example was at room temperature. After 12 hours from the start of standing and after 1 day, the drying was completed and the water had disappeared. From this result, it was confirmed that the content take-out device of the example is excellent in water discharge performance.

It is a figure which shows one example of the closing mechanism of the container opening part which concerns on this invention. It is a figure which shows only the cap in the closing mechanism of FIG. It is a figure which shows only the cylindrical opening part in the closing mechanism of FIG. It is a figure which shows one example of the closing mechanism of the container opening part which concerns on this invention. It is a figure which shows the notch provided in the engagement surface of the cap upper cover in the closing mechanism of FIG. It is a figure which shows another example of a notch part provided in the engagement surface of a cap upper cover. It is a figure which shows the opening operation | movement at the time of cap opening in the closing mechanism of the container opening part which concerns on this invention. It is a figure which shows the opening operation | movement at the time of cap opening in the closing mechanism of the container opening part which concerns on this invention. It is a figure which shows an example of the manufacturing method of the cap which comprises the closing mechanism of the container opening part of this invention. It is a figure which shows the example of 1 form of the content extraction apparatus 101 which has the closing mechanism of FIG. It is a figure which shows one example of a container which attached the content extraction apparatus 101 of FIG. It is a fragmentary sectional view of the contents extraction apparatus of an Example. It is a fragmentary sectional view of the contents extraction apparatus of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylindrical mouth part 1a ... Side surface of cylindrical mouth part 1b ... Upper end surface of cylindrical mouth part 1c ... Upper end opening part of cylindrical mouth part 2 ... Conduit part 3 ... Joint part 4 ... Straw part 5 ... Cap 6 ... Screw part (thread)
DESCRIPTION OF SYMBOLS 7 ... Support flange 8 ... Alignment rib 9 ... Upper end flange 10 ... Contents outlet hole 11 ... Container main body 12 ... Cap main body 12a ... Upper end surface of cap main body 12b ... Vertical groove 12c ... Engagement surface 12d ... Engagement surface 13 ... Cap Upper lid 13a ... disc part 13b ... skirt part 13c ... engagement surface 13d ... engagement surface 14 ... contact surface 16 ... convex part 17 ... fitting part 18 ... packing 19 ... inner seal material 20 ... screw part (screw groove)
DESCRIPTION OF SYMBOLS 21 ... Notch part 21a ... Inclined surface 21b ... Opening part of a hollow 21c ... Side surface 101 ... Content extraction apparatus

Claims (8)

A container mouth closing mechanism comprising a combination of a cylindrical mouth provided in the container body and a cap for closing the cylindrical mouth,
The cap has a cylindrical shape that covers a side surface of the cylindrical mouth portion, and has a screw portion that is screwed into an inner surface of the cylindrical shape with a screw portion provided on an outer surface of the cylindrical mouth portion, A cap body capable of moving up and down while rotating along the side surface of the cylindrical mouth portion, a cap upper cover covering the upper end opening of the cylindrical mouth portion and closing the cylindrical mouth portion,
The cap main body and the cap upper lid are mutually independent members that can rotate the cap main body without rotating the cap upper lid, and are fitted to each other so as not to separate,
When the cap main body is rotated along the side surface of the cylindrical mouth portion and moved toward the upper end of the cylindrical mouth portion, the cap main body is slidably engaged with the cap upper lid, and the cap upper lid is engaged. The cylindrical mouth is opened by pushing up,
When the cap body is rotated along the cylindrical mouth portion and moved toward the lower end of the cylindrical mouth portion, the cap body engages with the cap upper lid, and the cap upper lid is pulled down so that the cylindrical mouth portion is moved. Is sealed,
In a state in which the cap body seals the cylindrical mouth portion, the engagement surface of the cap upper cover that engages with the engagement surface of the cap body has a cut surface that becomes lower on the peripheral side of the cap upper cover. A closing mechanism for a container mouth, wherein a notch is provided.   The container mouth closing mechanism according to claim 1, wherein an upper end surface of the cylindrical mouth and the cap upper lid are bonded to each other.   3. The container mouth closing mechanism according to claim 1, wherein the cap top lid has an inner seal material on a contact surface with an upper end surface of the cylindrical mouth portion.   When the cap body is rotated along the side surface of the cylindrical mouth portion and moved in the upper end direction of the cylindrical mouth portion, an engagement surface that engages the cap body and the cap upper lid is configured to disengage the cap body. The container mouth closing mechanism according to any one of claims 1 to 3, wherein the container mouth does not contact at all when rotated along the side surface of the cylindrical mouth and moved to the lowermost side.   Which of the opposing engagement surfaces of the cap main body and the cap upper lid engage when the cap main body is rotated along the side surface of the cylindrical mouth portion and moved toward the upper end of the cylindrical mouth portion. The container mouth portion closing mechanism according to any one of claims 1 to 4, wherein the crab convex portion is provided at one location. In the engagement surface of the cap upper lid provided with the notch, the portion of the cap provided with the notch compared to the outer diameter R1 of the cap upper lid of the portion not provided with the notch. The container mouth closing mechanism according to any one of claims 1 to 5, wherein an outer diameter R2 of the cap upper lid is smaller. A method for manufacturing a cap according to any one of claims 1 to 6 , wherein the cap body and the cap upper lid are integrally formed with a molded body connected by a thin portion that can be broken, and the cap upper lid. Pressing the cap toward the cap body to break the thin portion and simultaneously fitting the cap upper lid and the cap body. A container comprising the container mouth portion closing mechanism according to claim 1.

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