Patent Publication Number: US-2021188500-A1

Title: Cap

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a Continuation Application of PCT application No. PCT/JP2019/035338, filed Sep. 9, 2019, which was published under PCT Article 21(2) in Japanese. 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2018-169580, filed Sep. 11, 2018, the entire contents of which are incorporated herein by reference. 
    
    
     FIELD 
     The present invention relates generally to a cap for closing a can container. 
     BACKGROUND 
     Conventionally, a cap for sealing a mouth portion of a can container has a configuration in which a sealing member made of a resin material that is in close contact with the mouth portion is provided on an inner surface of a cap body. Jpn. Pat. Appln. KOKAI Publication No. 2017-178421 discloses a technique in which a cap body and a sealing member are not bonded to each other in order to reduce opening torque when the cap is opened. As described above, in a case where the sealing member is not bonded, a locking protrusion protruding inward is formed on a skirt portion of the cap body to lock the sealing member so that the sealing member does not fall off. 
     Furthermore, in a case where a cap is used for a positive pressure can having a positive internal pressure, a technique is known in which a vent slit is formed in the cap in order to release the internal pressure when the cap is opened. 
     SUMMARY 
     However, in a case where the vent slit is provided in the cap, a tactile sensation when opening the cap may be reduced, such as a cut end portion of the vent slit Causing a sense of discomfort in the hand when opening the cap. In addition, there is a concern that the contents may scatter from the vent slit together with the gas in the can when opening the cap. Therefore, a technique for suppressing the scattering of the contents from the vent slit is required. 
     Therefore, an object of the present invention is to provide a cap capable of improving a tactile sensation when opening the cap and suppressing scattering of contents. 
     According to the present invention, it is possible to provide a cap capable of improving a tactile sensation when opening the cap and suppressing scattering of contents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view showing a configuration of a cap according to a first embodiment of the present invention in a partial cross section. 
         FIG. 2  is a side view showing the configuration of the cap. 
         FIG. 3  is a cross-sectional view showing the configuration of the cap with a part thereof omitted. 
         FIG. 4  is a cross-sectional view showing a configuration of a main part of the cap. 
         FIG. 5  is a cross-sectional view showing a configuration of a cap body of the cap. 
         FIG. 6  is a cross-sectional view showing a configuration of the cap body. 
     
    
    
     DETAILED DESCRIPTION 
     According to one aspect of the present invention, a cap includes a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion; a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and a slit portion provided in the bead portion. 
     Hereinafter, a cap  1  according to an embodiment of the present invention will be explained with reference to  FIG. 1  to  FIG. 6 . 
       FIG. 1  is a side view showing a configuration of cap  1  according to a first embodiment of the present invention in a partial cross section.  FIG. 2  is a side view showing the configuration of the cap  1 .  FIG. 3  is a cross-sectional view showing the configuration of the cap  1  with a part thereof omitted.  FIG. 4  is a cross-sectional view showing a configuration of a main part of the cap  1  and movement of gas in a can container  100  when the cap  1  is separated from a mouth portion  110  of the can container  100 .  FIG. 5  is a cross-sectional view showing a configuration of a cap body  11  used in the cap  1 , taken along a cross section of line V-V in  FIG. 2 .  FIG. 6  is a cross-sectional view showing a configuration of a bead portion  32  and a slit portion  33  of the cap body  11 , taken along a cross section of line VI-VI in  FIG. 2 , with other configurations partially omitted. 
     As shown in  FIG. 1 , the cap  1  is attached to the mouth portion  110  of the can container  100 , and is wound and compacted in a state of being placed on the mouth portion  110  of the can container  100 , thereby sealing the can container  100 . 
     Here, the can container  100  is a so-called bottle-shaped container that contains a beverage or the like. For example, the can container  100  is made of a metal material such as an aluminum alloy or a surface-treated steel plate having resin films laminated on both surfaces thereof. The can container  100  is formed in a cylindrical shape having a different outer diameter, with one end reduced in diameter. The can container  100  has the mouth portion  110  at one end for discharging the contained beverage. The mouth portion  110  has a law portion  111 , a male screw portion  112 , and a curled portion  113  on the outer peripheral surface thereof from the bottom surface side of the can container  100  toward the end portion. 
     The jaw portion  111  is configured to protrude annularly. The curled portion  113  is formed to have a smaller diameter than the male screw portion  112 . The outer diameter of the curled portion  113  is smaller than the inner diameter of the cap  1 . The curled portion  113  is formed by folding the end portion of the mouth portion  110  once or more. The curled portion  113  forms an opening through which the beverage contained in the can  100  is discharged. 
     As shown in  FIG. 1  to  FIG. 4 , the cap  1  includes the cap body  11  and a sealing member  12  provided separately in the cap body  11 . 
     The cap body  11  is formed of a material obtained by forming a resin coating layer on a metal material such as an aluminum alloy. The cap body  11  is formed by performing each molding such as drawing, knurling, and roll-on molding of a thin plate-shaped material into a cup shape. 
     The cap body  11  includes a disk-shaped top plate portion  21  and a cylindrical skirt portion  22  provided integrally with a peripheral edge portion of the top plate portion  21 . In the cap body  11 , the top plate portion  21  and the skirt portion  22  are integrally and continuously configured by an annular and curved corner portion  23 . 
     The top plate portion  21  has a disk shape and has a flat main surface. One end of the skirt portion.  22  is continuous with the top plate portion  21  via the corner portion  23 , and the other end is open. The skirt portion  22  includes a plurality of recessed portions  31 , a bead portion  32 , a plurality of slit portions  33 , a female screw portion  34 , and a tamper evidence band portion  35  between an end portion on the top plate portion  21  side and an opened distal end portion. 
     As shown in  FIG. 1  to  FIG. 6 , the plurality of recessed portions  31 , the bead portion  32 , the plurality of slit portions  33 , the female screw portion  34 , and the tamper evidence band portion  35  are formed by performing processing, such as knurling or roll-on molding, on a cup-shaped molded product including the top plate portion  21 , the cylindrical skirt portion  22  on which the plurality of recessed portions  31 , the bead portion  32 , the plurality of slit portions  33 , the female screw portion  34 , and the tamper evidence band portion  35  are not formed, and the corner portion  23 . 
     As shown in  FIG. 1 ,  FIG. 2 , and  FIG. 5 , the plurality of recessed portions  31  are provided between the top plate portion  21  and the bead portion  32  of the skirt portion  22 . For example, the plurality of recessed portions  31  are arranged at equal intervals in the circumferential direction of the skirt portion  22 . The plurality of recessed portions  31  are formed so that the dimension in the axial direction of the cap  1  is longer than the dimension in the circumferential direction of the cap  1 . 
     As shown in  FIG. 1 ,  FIG. 2 ,  FIG. 4 , and  FIG. 6 , the bead portion  32  is formed in an annular shape. The bead portion is configured in a manner Such that the skirt portion  22  annularly protrudes  7  ward in the radial direction on the distal end side of the skirt portion  22  with respect to the plurality of recessed portions  31 . The inner diameter of the bead portion  32  is smaller than the outer diameter of the sealing member  12 . Therefore, the bead portion  32  configures a locking portion that restricts movement of the sealing member  12  disposed on the top plate portion  21  in a direction away from the top plate portion  21 . Specifically, as shown in  FIG. 1 ;  FIG. 3 , and  FIG. 4 , a portion of the bead portion  32  having the smallest inner diameter is set to be smaller than the outer diameter of the sealing member  12 , and is inclined with respect to the axis of the skirt portion  22  from such a portion to the skirt portion  22 . 
     As shown in  FIG. 1 ,  FIG. 2 ,  FIG. 4 , and  FIG. 6 , the plurality of slit portions  33  are provided in the bead portion  32 . The plurality of slit portions  33  are arranged at equal intervals along the circumferential direction of the bead portion  32 . For example, the slit portions  33  are provided at eight locations in the bead portion  32  at equal intervals in the circumferential direction. The slit portion  33  is configured by a cut provided in a part of the bead portion  32 . The slit portion  33  releases the internal pressure of the sealed can container  100  when the cap  1  is removed from the can container  100 . 
     As shown in  FIG. 1 ,  FIG. 3 , and  FIG. 4 , the slit portion  33  is provided at a portion closer to the distal end side of the skirt portion  22  than a portion of the bead portion  32  which is the innermost peripheral portion in the radial direction. In other words, the slit portion  33  is provided on the distal end side of the skirt portion.  22  with respect to a portion where the inner diameter of the bead portion  32  is the smallest. The slit portion  33  is formed by a cut provided in a part of the bead portion  32  and extending in the circumferential direction. Therefore, as shown in  FIG. 1 ,  FIG. 3 , and  FIG. 4 , the slit portion  33  has a first end portion  33   a  on the p plate portion  21  side and a second end portion  33   b  on the distal end side of the skirt portion  22 . 
     The first end portion  33   a  and the second end portion  33   b  of the slit portion  33  are formed by portions of the bead portion  32 . The first end portion  33   a  extends radially inward from the top plate portion  21  side toward the distal end side of the skirt portion  22 . In other words, as shown in  FIG. 4 , when the can container  100  is set downward and the cap  1  is set upward in a state where the cap  1  is placed on the mouth portion  110  of the can container  100 , the first end portion  33   a  extends inward and downward of the cap  1 . 
     Furthermore, for example, as shown in  FIG. 4 , the distal end of the first end portion  33   a  bends toward the axial direction of the cap  1  and extends toward the distal end of the cap  1  in the axial direction of the cap  1 . Here, the expression “the distal end of the first end portion  33   a  extends toward the distal end of the cap  1  in the axial direction” does not mean that the extension of the first end portion  33   a  needs to be a predetermined length; however, it may mean that the distal end of the first end portion  33   a  is directed in the axial direction by bending a part of the first end portion  33   a  so that the distal end thereof is directed in the axial direction. 
     The second end portion  33   b  extends radially inward from the distal end side of the skirt portion  22  toward the top plate portion  21 , In other words, as shown in  FIG. 4 , when the can container  100  is set downward and the cap  1  is set upward in a state where the cap  1  is placed on the mouth portion  110  of the can container  100 , the second end portion  33   b  extends inward and upward of the cap  1 . 
     As shown in  FIG. 4 , the distal end of the first end portion  33   a  of the slit portion  33  is located inward of the distal end of the second end portion  33   b  in the radial direction of the skirt portion  22 . That is, in the slit portion  33 , the distal end of the first end portion  33   a  is closer to the center of the skirt portion  22  than the distal end of the second end portion  33   b.    
     The female screw portion  34  is configured to be screwed with the male screw portion  112  of the can container  100 . The female screw portion  34  is molded together with the can container  100 . That is, the female screw portion  34  is not molded in the cap  1  before attachment to the can container  100 ; however, it is molded when being integrally combined with the can container  100 . 
     As shown in  FIG. 1  and  FIG. 2 , the tamper evidence band portion  35  engages with the jaw portion  111  of the cap container  100  in a direction in which the cap  1  moves away from the can container  100  and in an axial direction of the cap  1 . Furthermore, the tamper evidence band portion  35  has a breaking portion  35   a  which is broken when the cap  1  is opened and is detached from the skirt portion  22 . That is, the tamper evidence band portion  35  is configured by forming a slit on the end portion side of the skirt portion  22  while leaving the breaking portion  35   a , and is shaped into the shape of the jaw portion  111  of the can container  100  when it is integrally combined with the can container  100 , thereby engaging with the jaw portion  111 , in a manner similar to the female screw portion  34 . 
     As shown in  FIG. 3 , the sealing member  12  is formed separately from the cap body  11 . That is, the sealing member  12  is disposed to face the top plate portion  21  and the skirt portion  22 , and is not bonded to the cap  1 . Specifically, as shown in  FIG. 1 ,  FIG. 3 , and  FIG. 4 , the sealing member  12  is formed in a disk shape and has an outer diameter set to be larger than an inner diameter of the bead portion  32  provided in the skirt portion  2 L of the cap body  11 . Furthermore, the outer diameter of the sealing Member  12  is set to be equal to or slightly smaller than the diameter of a circle tangent to the inner surfaces of the plurality of recessed portions  31  provided in the skirt portion  22  of the cap body  11 . 
     The sealing member  12  is prevented from falling off from the cap body  11  in the axial direction by engaging with the bead portion  32  protruding in the radial direction from the inner peripheral surface of the skirt portion  22  in the axial direction of the cap body  11 , and is integrally provided with the cap body  11 , Furthermore, the sealing member  12  is brought into contact with the inner surfaces of the plurality of recessed portions  31  of the skirt portion  22  to be engaged with the cap body  11  in the radial direction, whereby the sealing Member  12  is centered so that the center thereof is positioned in a predetermined range on the axis of the cap body  11 . 
     The sealing member  12  includes a disk-shaped sliding layer  41  and a disk-shaped sealing layer  42  integrally laminated on the sliding layer  41 . The sealing member  12  is configured by integrally molding the sliding layer  41  and the sealing layer  42  with different resin materials. The sealing member  12  includes, for example, a flat plate portion  12   a  that is uniformly thick and a curved surface portion  12   b  in which an outer surface of an outer peripheral edge on the top plate portion  21  side is formed of a curved surface. In other words, the sealing member  12  is formed in a disk shape, and the ridge portion on the top plate portion  21  side is configured by a curved surface having a predetermined curvature. Furthermore, in the sealing member  12 , the curved surface portion  12   b  forming the outer peripheral edge side is configured to be thinner than the flat plate portion  12   a , the curved surface portion  12   b  is configured to be gradually thinner from the center side toward the outer peripheral edge, and the distal end of the curved surface portion  12   b , that is, the outer peripheral edge, is configured to be thinnest among other portions. The flat plate portion  12   a  configures a sealing portion in which a part of the curved surface portion  12   b  side comes into contact with the mouth portion  110  of the can container  100 . In the flat plate portion  12   a , for example, the sealing portion is configured to be thicker than other portions. 
     The sliding layer  41  is made of a resin material whose hardness is relatively higher (harder) than that of the sealing layer  42 . Furthermore, the sliding layer  41  is made of a resin material that does not have adhesion or stickiness with the resin film layer of the cap body  11 . That is, the sliding layer  41  is not bonded to the top plate portion  21  and slides on the top plate portion  21  in a state of being in contact with the top plate portion  21 . 
     Examples of the resin material used for the sliding layer  41  include olefin-based resins such as polypropylene resins and polyethylene resins, polyester-based resins such as polyethylene terephthalate, styrene-based resins, and acrylic resins. In the present embodiment, the sliding layer  41  is made of, for example, polypropylene resin. A pigment, a lubricant, a softener, and the like can be appropriately added to the resin material used for the sliding layer  41 . 
     The sliding layer  41  is provided separately from the cap body  11  so as to face the top plate portion  21  of the cap body  11 . The sliding layer  41  is configured to be slidable with the top plate portion  21  of the cap body  11  by the resin material being used. The sliding layer  41  is configured in a disk shape. The outer diameter of the sliding layer  41  is smaller than the inner diameter of the skirt portion  22 , smaller than the inscribed circle of the plurality of recessed portions  31 , and larger than the smallest inner diameter of the bead portion  32 . 
     The sliding layer  41  includes a first flat plate portion  41   a  having a uniform thickness, a first curved surface portion  41   b  whose outer surface of an outer peripheral edge on the top plate portion  21  side is formed by a curved surface, and a protruding portion  41   c  provided on the sealing layer  42  side of the first curved surface portion  41   b . The first flat plate portion  41   a  is configured in a manner such that the portion from the center of the sliding layer  41  to the outer peripheral side of the portion of the mouth portion  110  facing the curled portion  113  has a uniform thickness. 
     The first curved surface portion  41   b  is configured in a manner such that the thickness of a portion from the outer peripheral side of a portion facing the curled portion  113  of the mouth portion  110  to the outer peripheral edge is made gradually thinner toward the outer peripheral edge. The protruding portion  41   c  is configured in an annular protruding shape that is inclined with respect to the axial direction of the sliding layer  41  and the surface direction of the top plate portion  21  and is curved or inclined toward the opening end portion side of the skirt portion  22 . The thickness of the protruding portion  41   c  gradually decreases from the first curved surface  41   b  toward the distal end. 
     The sealing layer  42  is made of a resin material whose hardness is relatively lower (softer) than that of the sliding layer  41 . Examples of the resin material used for the sealing layer  42  include olefin-based resins, polyester-based resins, styrene-based resins, and acrylic resins, and more preferably include blended materials of a styrene-based elastomer and a polypropylene resin, blended materials of low-density polyethylene and a styrene-based elastomer, and polyester-based elastomers. In the present embodiment, the sealing layer  42  is made of, for example, a mixed material of a styrene-based elastomer and a polypropylene resin. A pigment, a lubricant, a softener, and the like can be appropriately added to the resin material used for the sealing layer  42 . 
     The sealing layer  42  is integrally provided on the main surface of the sliding layer  41  on the side facing the mouth portion  110 . The sealing layer  42  is formed in a disk shape. The outer diameter of the sealing layer  42  is configured to be larger than the outer diameter of the curled portion  113  of the mouth portion  110 , and is configured to be substantially the same as the outer diameter of the sliding layer  41 . 
     The sealing layer  42  includes a second flat plate portion  42   a  whose portion facing the mouth portion  110  is thicker than other portions, a second curved surface portion  42   b  whose outer surface of the outer peripheral edge on the top plate portion  21  side is a curved surface, and an annular recess  42   c  provided on the main surface of the second curved surface portion  42   b  on the side opposite to the sliding layer  41  side. The second flat plate portion  42   a  has a flat main surface facing the curled portion  113 . For example, the second flat plate portion.  42   a  is configured to have the same diameter as the first flat plate portion  41   a  of the sliding layer  41 . The second flat plate portion  42   a  configures the flat plate portion  12   a  of the sealing member  12  together with the first flat plate portion  41   a.    
     The second curved surface portion  42   b  has, for example, a main surface flush with a main surface of the second flat plate portion  42   a  facing the curled portion  113 . The second curved surface portion  42   b  is configured in a manner such that the thickness of a portion from the outer peripheral side of a portion facing the curled portion  113  of the mouth portion  110  to the outer peripheral edge is made gradually thinner toward the outer peripheral edge. The second curved surface portion  42   b  is stacked on the first curved surface portion  41   b  and the protruding portion  41   c . The second curved surface portion  42   b  configures the curved surface portion  12   b  of the sealing member  12  together with the first curved surface portion  41   b  and the protruding portion  41   c.    
     The recess  42   c  is, for example, an annular recess having a semi-circular cross section. When the cap  1  is disposed in a state in which the top plate portion  21  faces upward and the sealing member  12  falls below the top plate portion  21 , the sealing member  12  abuts against the bead portion  32  to be locked, and downward movement of the sealing member  12  in the gravity direction is restricted. Furthermore, when the cap  1  is removed from the can container  100 , the sealing member  12  is supported by the bead portion  32 , is separated from the mouth portion  110 , and moves together with the cap body  11 . 
     A method of manufacturing the cap  1  configured in the above manner will be briefly explained below. First of all, for example, the cap body  11  is molded in a cup shape from a metal plate material. The cap body  11  is then disposed on a lower mold in a posture in which the top plate portion  21  is positioned on a lower side in the gravity direction. A molten or softened resin material for the sliding layer  41  is then supplied onto the top plate portion  21 , and the supplied resin material is compression-molded by an upper mold to mold the sliding layer  41 . A molten or softened resin material for the sealing layer  42  is supplied onto the sliding layer  41 , and the supplied resin material is compression-molded by the upper mold to mold the sealing layer  42  on the sliding layer  41 . Subsequently, the recessed portion  31 , the bead portion  32 , the slit portion  33 , the tamper evidence band portion  35 , and the like are formed in the skirt portion  22  of the cap body  11 . For example, the bead portion  32  is molded by pressing a molding tool whose distal end is curved against the outer surface of the skirt portion  22 . The slit portion  33  is molded by disposing a molding tool having a cutting edge on the outer surface side and the inner surface side of the skirt portion  22  and sandwiching and shearing the molded bead portion  32  from the outer surface side and the inner surface side. The cap  1  is manufactured by such a process. 
     Furthermore, the manufactured cap  1  is set in a posture in which the top plate portion  21  of the cap  1  faces upward when the cap  1  is attached to the mouth portion  110  of the can container  100 . Here, the sealing member  12  comes into contact with the inner surfaces of the plurality of recessed portions  31 , thereby being positioned at the central portion of the cap body  11 . When the sealing member  12  descends by a certain distance, the sealing member  12  is supported by the bead portion  32 , and the movement thereof is restricted in the descending direction. When the cap  1  is placed on the mouth portion  110  in this state, a predetermined portion of the sealing layer  42  of the sealing member  12  faces the mouth portion  110  in this state, by roll-on molding the skirt portion  22  while drawing the corner portion  23  of the cap body  11 , the cap  1  is wound and compacted on the mouth portion  110  of the can container  100 . 
     According to the cap  1  configured in this manner, the bead portion  32  for restricting the movement of the sealing member  12  in the axial direction of the cap  1  is provided in the skirt portion  22 , and the slit portion  33  for releasing the internal pressure of the can container  100  is provided in the bead portion  32 . With this configuration, since the slit portion  33  is provided in the bead portion  32  recessed inward from the skirt portion  22  in an annular shape, the slit portion  33  is positioned inward in the radial direction from the outer peripheral surface of the skirt portion  22 . 
     Therefore, when the cap  1  is operated to be opened, the slit portion  33  will not come into contact with a finger; therefore, the slit portion  33  will not cause a sense of discomfort by coming in contact with a hand. For this reason, even if the slit portion  33  is provided, the cap  1  can improve the tactile sensation when being opened. 
     In addition, since the distance from the slit portion  33  to the outer peripheral surface of the skirt portion  22  can be secured, when the internal pressure of the can container  100  is released, the contents can be suppressed from scattering together with the gas in the can container  100 . 
     In addition, since the slit portion  33  is disposed on the distal end side of the skirt portion  22 , that is, on the lower side in the posture of being attached to the can container  100  with respect the portion where the inner diameter of the bead portion  32  is the smallest, the skirt Portion  22  is positioned lower than the gap generated by separation of the sealing member  12  and the mouth portion  110  at the time of opening. Therefore, the distance in which the gas and the contents move becomes long, and the gas and the contents move downward from the inside of the can container  100  through the gap between the sealing member  12  and the mouth portion  110 , and then flow into the atmosphere from the slit portion  33 . Therefore, since it is possible to prevent the contents from moving to the slit portion  33  as much as possible, it is possible to further suppress the contents from scattering from the slit portion  33 . 
     Furthermore, in the slit portion  33 , the distal end of the first end portion  33   a  is positioned further inward in the radial direction of the skirt portion  22  than the distal end of the second end portion  33   b . Therefore, as shown by the arrow in  FIG. 4 , the gas and the contents which have moved downward through the gaps between the sealing member  12  and the mouth portion  110  further move obliquely upward from between the distal end of the first end portion  33   a  and the distal end of the second end portion  33   b . As a result, the movement of the contents is blocked by the first end portion  33   a  of the slit portion  33 , and the scattering of the contents from the slit portion  33  can be further suppressed. 
     In addition, since the end portion of the first end portion  33   a  is configured to extend downward, the movement of the gas and the contents is changed from a downward movement to an upward movement at the first end portion  33   a  as indicated by the arrow in  FIG. 4 , and thus the movement of the contents from the slit portion  33  can be further suppressed. 
     In other words, the configuration in which the distal end of the first end portion  33   a  is positioned further inward in the radial direction of the skirt portion  22  than the distal end of the second end portion  33   b , and the configuration in which the distal end of the first end portion  33   a  extends downward, cause the distal end of the first end portion  33   a  to serve as a function for blocking liquid which is the contents moving together with the gas. Thus, the slit portion  33  has an effect of suppressing the contents from scattering. 
     In addition, the cap  1  is configured in a manner such that the plurality of recessed portions  31  are provided on the top plate portion  21  side with respect to the bead portion  32  of the skirt portion  22 , whereby the sealing member  12  can be centered by the inner surfaces of the recessed portions  31 . The plurality of recessed portions  31  improve the grip of the cap  1  when the cap  1  is opened, and prevent the upper portion of the cap  1  from shrinking due to molding of the bead portion during manufacturing. 
     As described above, according to the cap  1  according to an embodiment of the present invention, by providing the slit portion  33  in the bead portion  32 , it is possible to improve the tactile sensation when opening the cap, and suppress the contents from scattering. 
     Note that the present invention is not limited to the above embodiment. For example, the slit portion  33  is not limited to the above configuration. In the example described above, the slit portion  33  may be provided only in the bead portion  32  recessed inward from the skirt portion  22  in an annular shape. The slit portion  33  having this configuration can also improve the tactile sensation of the cap  1  when the cap is opened, and suppress the contents from scattering. Similarly, the slit portion  33  may be configured in a manner such that the distal end of the first end portion  33   a  is positioned at the same position as the distal end of the second end portion  33   b  in the radial direction of the skirt portion  22  or positioned outward in the radial direction of the skirt portion  22  in addition, the slit portion  33  may have a shape in Which the distal end′ of the first end portion  33   a  faces the same direction as other portions of the first end portion  33   a . However, in consideration of suppressing the contents from scattering, it is preferable that the slit portion  33  be located on the distal end side of the skirt portion  22  with respect to the portion where the inner diameter of the bead portion  32  is the smallest, the distal end of the first end portion  33   a  extend in the axial direction, and the distal end of the first end portion  33   a  be disposed radially inward with respect to the distal end of the second end portion  33   b.    
     It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention in the implementation stage. In addition, the embodiments may be appropriately combined and implemented, and, in this case, exercise a combined effect. Furthermore, various inventions are included in the above embodiment, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect can be obtained, the configuration rom which the constituent elements are deleted can be extracted as the invention.