U.S. patent application number 17/196184 was filed with the patent office on 2021-06-24 for cap.
This patent application is currently assigned to Daiwa Can Company. The applicant listed for this patent is Daiwa Can Company. Invention is credited to Eiji Araki, Eiji Fujishige, Keisuke Hashimoto, Junji Matsumura, Kenji Takagi.
Application Number | 20210188500 17/196184 |
Document ID | / |
Family ID | 1000005459014 |
Filed Date | 2021-06-24 |
United States Patent
Application |
20210188500 |
Kind Code |
A1 |
Fujishige; Eiji ; et
al. |
June 24, 2021 |
CAP
Abstract
A cap includes 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.
Inventors: |
Fujishige; Eiji;
(Sagamihara-shi, JP) ; Matsumura; Junji;
(Sagamihara-shi, JP) ; Araki; Eiji;
(Sagamihara-shi, JP) ; Takagi; Kenji;
(Sagamihara-shi, JP) ; Hashimoto; Keisuke;
(Sagamihara-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Daiwa Can Company |
Tokyo |
|
JP |
|
|
Assignee: |
Daiwa Can Company
Tokyo
JP
|
Family ID: |
1000005459014 |
Appl. No.: |
17/196184 |
Filed: |
March 9, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/JP2019/035338 |
Sep 9, 2019 |
|
|
|
17196184 |
|
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|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65D 51/1688 20130101;
B65D 41/325 20130101; B65D 41/3466 20130101 |
International
Class: |
B65D 51/16 20060101
B65D051/16; B65D 41/34 20060101 B65D041/34; B65D 41/32 20060101
B65D041/32 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 11, 2018 |
JP |
2018-169580 |
Claims
1. A cap comprising: 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.
2. The cap according to claim 1, wherein the slit portion is formed
closer to a distal end side of the skirt portion than a portion of
the bead portion having a smallest inner diameter.
3. The cap according to claim 1, wherein the slit portion includes
a first end portion on a side of the top plate portion and a second
end portion on a distal end side of the skirt portion, and the
first end portion is located inward in a radial direction of the
skirt portion with respect to the second end portion.
4. The cap according to claim 3, wherein a distal and of the first
end portion extends in an axial direction of the skirt portion.
5. The cap according to claim 1, comprising a plurality of recessed
portions provided in the skirt portion on the top plate portion
side with respect to the bead portion and provided in a
circumferential direction.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] 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.
[0002] 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
[0003] The present invention relates generally to a cap for closing
a can container.
BACKGROUND
[0004] 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.
[0005] 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
[0006] 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.
[0007] 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.
[0008] 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
[0009] 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.
[0010] FIG. 2 is a side view showing the configuration of the
cap.
[0011] FIG. 3 is a cross-sectional view showing the configuration
of the cap with a part thereof omitted.
[0012] FIG. 4 is a cross-sectional view showing a configuration of
a main part of the cap.
[0013] FIG. 5 is a cross-sectional view showing a configuration of
a cap body of the cap.
[0014] FIG. 6 is a cross-sectional view showing a configuration of
the cap body.
DETAILED DESCRIPTION
[0015] 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.
[0016] Hereinafter, a cap 1 according to an embodiment of the
present invention will be explained with reference to FIG. 1 to
FIG. 6.
[0017] 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.
[0018] 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.
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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 33a on the p plate portion 21 side and a second end portion
33b on the distal end side of the skirt portion 22.
[0030] The first end portion 33a and the second end portion 33b of
the slit portion 33 are formed by portions of the bead portion 32.
The first end portion 33a 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 33a extends inward and
downward of the cap 1.
[0031] Furthermore, for example, as shown in FIG. 4, the distal end
of the first end portion 33a 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 33a extends toward the distal end of the
cap 1 in the axial direction" does not mean that the extension of
the first end portion 33a needs to be a predetermined length;
however, it may mean that the distal end of the first end portion
33a is directed in the axial direction by bending a part of the
first end portion 33a so that the distal end thereof is directed in
the axial direction.
[0032] The second end portion 33b 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 33b extends inward and upward
of the cap 1.
[0033] As shown in FIG. 4, the distal end of the first end portion
33a of the slit portion 33 is located inward of the distal end of
the second end portion 33b in the radial direction of the skirt
portion 22. That is, in the slit portion 33, the distal end of the
first end portion 33a is closer to the center of the skirt portion
22 than the distal end of the second end portion 33b.
[0034] 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.
[0035] 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 35a
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 35a, 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.
[0036] 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 2L 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.
[0037] 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.
[0038] 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 12a that is uniformly thick and a
curved surface portion 12b 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 12b forming the outer peripheral edge side is
configured to be thinner than the flat plate portion 12a, the
curved surface portion 12b is configured to be gradually thinner
from the center side toward the outer peripheral edge, and the
distal end of the curved surface portion 12b, that is, the outer
peripheral edge, is configured to be thinnest among other portions.
The flat plate portion 12a configures a sealing portion in which a
part of the curved surface portion 12b side comes into contact with
the mouth portion 110 of the can container 100. In the flat plate
portion 12a, for example, the sealing portion is configured to be
thicker than other portions.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] The sliding layer 41 includes a first flat plate portion 41a
having a uniform thickness, a first curved surface portion 41b
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 41c provided on the sealing layer 42 side of the first
curved surface portion 41b. The first flat plate portion 41a 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.
[0043] The first curved surface portion 41b 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
41c 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 41c gradually decreases
from the first curved surface 41b toward the distal end.
[0044] 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.
[0045] 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.
[0046] The sealing layer 42 includes a second flat plate portion
42a whose portion facing the mouth portion 110 is thicker than
other portions, a second curved surface portion 42b whose outer
surface of the outer peripheral edge on the top plate portion 21
side is a curved surface, and an annular recess 42c provided on the
main surface of the second curved surface portion 42b on the side
opposite to the sliding layer 41 side. The second flat plate
portion 42a has a flat main surface facing the curled portion 113.
For example, the second flat plate portion. 42a is configured to
have the same diameter as the first flat plate portion 41a of the
sliding layer 41. The second flat plate portion 42a configures the
flat plate portion 12a of the sealing member 12 together with the
first flat plate portion 41a.
[0047] The second curved surface portion 42b has, for example, a
main surface flush with a main surface of the second flat plate
portion 42a facing the curled portion 113. The second curved
surface portion 42b 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 42b is stacked
on the first curved surface portion 41b and the protruding portion
41c. The second curved surface portion 42b configures the curved
surface portion 12b of the sealing member 12 together with the
first curved surface portion 41b and the protruding portion
41c.
[0048] The recess 42c 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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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.
[0054] 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.
[0055] Furthermore, in the slit portion 33, the distal end of the
first end portion 33a is positioned further inward in the radial
direction of the skirt portion 22 than the distal end of the second
end portion 33b. 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 33a and the distal end of the second end portion 33b. As a
result, the movement of the contents is blocked by the first end
portion 33a of the slit portion 33, and the scattering of the
contents from the slit portion 33 can be further suppressed.
[0056] In addition, since the end portion of the first end portion
33a 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 33a as indicated by the arrow in
FIG. 4, and thus the movement of the contents from the slit portion
33 can be further suppressed.
[0057] In other words, the configuration in which the distal end of
the first end portion 33a is positioned further inward in the
radial direction of the skirt portion 22 than the distal end of the
second end portion 33b, and the configuration in which the distal
end of the first end portion 33a extends downward, cause the distal
end of the first end portion 33a 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.
[0058] 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.
[0059] 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.
[0060] 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 33a is positioned at the same position as the distal end of
the second end portion 33b 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 33a faces the
same direction as other portions of the first end portion 33a.
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 33a extend in the
axial direction, and the distal end of the first end portion 33a be
disposed radially inward with respect to the distal end of the
second end portion 33b.
[0061] 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.
* * * * *