JP2004291979A - Metal cap and bottle with metal cap fitted thereto - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal cap capable of enhancing the gripping property without degrading fittability, sealability, or the like. <P>SOLUTION: In the metal cap 10, a substantially cylindrical part 11 and a top plate 12 to cover one end of the cylindrical part 11 are integrated with each other by a metal plate, a knurl 13 comprising a plurality of recessed parts 13a and projecting parts 13b alternately arranged in the circumferential direction is provided on the cylindrical part 11, and 4-16 sets of the recessed parts 13a and projecting parts 13b to constitute the knurl 13 are arranged in the circumferential direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a metal cap having a knurl formed integrally by plastic molding of a metal plate material and having an uneven shape arranged in a circumferential direction.
[0002]
[Prior art]
Conventionally, as a cap for sealing a bottle, a metal cap in which a cylindrical portion and a top plate are integrally formed by plastic molding of a metal plate material such as aluminum or an aluminum alloy is used. The metal cap is attached to the bottle by being deformed along the screw portion provided in the bottle base, and a liner made of synthetic resin or the like affixed to the inner surface of the top plate is attached to the opening end of the bottle base. The container can be deformed so as to be pressed to seal the container (for example, see Patent Document 1).
[0003]
Generally, such a metal cap is provided with a screw portion at a central portion in the axial direction of the cylindrical portion, and a knurl provided above the screw portion to prevent slippage when opening and closing. The knurl has an uneven shape composed of a plurality of concave portions and convex portions alternately arranged in the circumferential direction, and is formed between an inner die and an outer die that are in contact with the inside and outside of the cylindrical portion. This knurl increases the friction between the finger and the cap at the time of opening due to the uneven shape. One set of each of the concave and convex portions is provided as one set. For example, about 27 to 28 sets are provided for a cap having a diameter of 38 mm. Is common.
[0004]
[Patent Document 1]
Japanese Patent No. 2622124 [0005]
[Problems to be solved by the invention]
This type of metal cap is required to have good gripping properties to facilitate opening and closing. However, in conventional knurls having 27 to 28 sets of irregularities, the circumferential width of each irregularity is small, and the shape of the outer peripheral surface is almost an approximate circle, so that it is difficult to say that the grip performance is good. .
[0006]
In order to cope with this problem, for example, it is conceivable that the cap is made polygonal such as hexagon or octagon. However, in the case of the polygonal cap, since the grip portion is flat, there is a possibility that the cap becomes slippery. Furthermore, since it is difficult to attach a polygonal cap to a cylindrical bottle cap, the attachment is poor, and there is a possibility that the sealing performance may be reduced.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to realize a cap with improved gripping properties without a decrease in mounting properties, sealing properties, and the like.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a metal cap according to the invention of claim 1 is configured such that a substantially cylindrical tubular portion and a top plate closing one end of the tubular portion are integrally formed of a metal plate material. A metal cap provided with a plurality of knurls composed of a plurality of concave portions and convex portions alternately arranged in the circumferential direction, wherein 4 to 16 sets of concave portions and convex portions are arranged in the circumferential direction.
[0009]
According to the present invention, since the number of the concave portions and the convex portions is small, the circumferential length of each of the concave portions and the convex portions is increased, and the force in the direction of rotating the cap formed by the step between the concave portions and the convex portions is easily received. Since the shapes are provided at a certain interval, the force applied to the cap can be efficiently applied to the opening and closing of the cap, and a cap that can be easily opened and closed can be realized.
[0010]
A metal cap according to a second aspect of the present invention is the metal cap according to the first aspect, wherein a vent hole formed by cutting a cylindrical portion in a circumferential direction is provided in each concave portion with a circumferential length substantially equal to that of each concave portion. Features.
[0011]
According to the present invention, the vent hole has a circumferential length substantially equal to that of the concave portion, so that the vent hole for releasing the gas in the container and reducing the pressure difference between the inside and outside prior to removing the cap when the cap is opened is provided. It can be provided in a sufficient size without standing.
[0012]
A metal cap according to a third aspect of the present invention is the metal cap according to the first or second aspect, wherein the ratio of the circumferential length of the convex portion to the circumferential length of the set of the concave portion and the convex portion is 0.05. ０．５0.5.
The metal cap according to the invention of claim 4 is characterized in that, in the metal cap of claims 1 to 3, the circumferential length of the projection is 1.5 to 10 mm.
[0013]
According to these inventions, since the circumferential length of the convex portion can be set to an appropriate size, the circumferential length of the convex portion is too small and the convex portion becomes sharp, or the circumferential length of the convex portion is reduced. It is possible to avoid such a problem that the cap is too large and the peripheral surface of the cap becomes an approximately circular shape and the grip performance is deteriorated.
[0014]
A metal cap according to a fifth aspect of the invention is characterized in that, in the metal cap of the first to fourth aspects, the concave portions and the convex portions are uniformly arranged in the circumferential direction of the cylindrical portion.
[0015]
For example, when a concave portion and a convex portion are unevenly arranged, and a convex portion having a small interval between them is formed, the portion is slippery, grip performance is deteriorated, or a circumferential direction of a vent hole provided between the convex portions is reduced. There is a possibility that the length becomes shorter and the degassing property is reduced. According to the present invention, since the concave portions and the convex portions are uniformly arranged, a metal cap having good gripping properties and gas releasing properties can be realized at any position on the peripheral surface.
[0016]
The bottle according to the invention of claim 6 is characterized in that the metal cap of claims 1 to 5 is mounted.
[0017]
According to the present invention, a metal cap with good grip and gas release properties is attached, so that a bottle that is easy to handle can be realized without slipping during opening and closing or opening with a high internal pressure of the container. can do.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6.
FIG. 1 shows a metal cap 10 according to a first embodiment of the present invention. In the metal cap 10, a top plate 12 having a diameter of 38 mm and a substantially cylindrical tube portion 11 hanging from an edge thereof are integrally formed from a metal plate material such as aluminum or an aluminum alloy.
[0019]
The cylindrical portion 11 of the metal cap 10 includes a knurl 13 composed of a plurality of concave portions 13a and convex portions 13b alternately arranged in the circumferential direction, and a plurality of scores 14a obtained by cutting the lower end portion of the cylindrical portion 11 in the circumferential direction. A shape such as a pill fur proof portion 14 composed of a bridge 14b connecting an upper portion (cap body) 10A and a lower portion (PP band) 10B of the metal cap 10 divided by the score 14a is provided. The inner surface of the top plate 12 is provided with a liner 15 made of a synthetic resin or the like, which is pressed along the opening end surface of the bottle 100 and tightly seals the bottle 100.
[0020]
In the present embodiment, the knurl 13 has a configuration in which four concave portions 13a and four convex portions 13b are arranged in the circumferential direction. Above each recess 13a, a vent hole 13c formed by cutting the cylindrical portion 11 in the circumferential direction is provided with a circumferential length substantially equal to that of each recess 13a.
The vent hole 13c is a hole for releasing gas in the container before opening. By providing a vent hole 13c in the metal cap 10 for sealing the positive pressure can in which the bottle 100 is higher than the atmospheric pressure, the screw portion of the metal cap 10 is broken when the gas in the container rises abnormally. As a result, it is possible to prevent a situation in which the metal cap 10 comes off and the screwing is released when the metal cap 10 is opened, and at the same time the metal cap 10 comes off vigorously due to the internal pressure.
[0021]
The vent hole 13c is generally formed simultaneously with the formation of the concave and convex shape of the knurl 13, and the concave portion 13a is formed between the inner die and the outer die sandwiching the inside and the outside of the cylindrical portion 11. It is easily possible to form the vent hole 13c formed on the upper part of the 13a with the same width.
[0022]
Here, when the circumferential length of the concave portion 13a is x1 (mm) and the circumferential length of the convex portion 13b is y1 (mm),
y1 / (x1 + y1) = 0.05 and y1 = 1.5 mm
It is. Further, the concave portions 13a and the convex portions 13b are uniformly arranged in the circumferential direction of the cylindrical portion 11, as shown in FIG.
By setting as described above, the convex portion 13b that is caught at the time of gripping in the knurl 13 is formed to have an appropriate circumferential length that enables secure gripping and does not bite into a finger.
[0023]
As shown in FIG. 1, the metal cap 10 is screwed onto the base 101 while being covered by the base 101 of the bottle 100 having a screw shape and pressed against the end face of the base 101 from above. The screw shape is formed on the tubular portion 11 (cap body 10A) (closed and tightened), so that it is mounted on the bottle 100 (FIG. 3). The screw shape of the cylindrical portion 11 is formed, for example, by rolling a disk-shaped screw forming roller (not shown) along the thread groove of the base portion 101 on the peripheral surface.
The lower part of the PP band 10B is swollen by a disk-shaped hem winding roller (not shown) rolling along the underside of the swollen part 102 provided below the screw shape of the base part 101. It is locked on the lower side of the protrusion 102.
[0024]
After the metal cap 10 is wound around the bottle 100 and before it is first removed from the bottle 100, each bridge 14b connecting the cap body 10A and the PP band 10B is cut. Therefore, by checking whether or not the bridge 14b is broken, it can be easily checked whether or not the bottle 100 (metal cap 10) has already been opened.
[0025]
The metal cap 10 thus attached to the bottle 100 is rotated with respect to the bottle 100 by grasping the knurl 13 when opening the cap. At this time, since the user can put his / her finger on the concave portion 13a and the convex portion 13b of the knurl 13, the metal cap 10 does not slip and can be firmly gripped and rotated.
[0026]
When the metal cap 10 is rotated with respect to the bottle 100, the PP band 10 </ b> B is locked by the bulging portion 102 and rotates, while the cap body 10 </ b> A screwed to the base 101 has a screw shape. Then, the cap body 10A is lifted by being rotated along, and only the cap body 10A is removed from the bottle 100.
During the opening, the liner 15 is separated from the opening end of the base 101, and the gas in the container is discharged from between the liner 15 and the opening end of the base 101 through each vent hole 13c. Thereby, when the screwing of the metal cap 10 is released, the inside of the bottle 100 is at the atmospheric pressure, so that the metal cap 10 can be prevented from flying from the bottle 100 due to the internal pressure of the container.
[0027]
In particular, in the present embodiment, each vent hole 13c is formed with the same width as the concave portion 13a provided in 95% of the entire circumference of the metal cap 10, and there are only four vent holes 13c, and each vent hole 13c has Since the circumferential length of the hole 13c is large, gas is easily passed.
In the circumferential length of the convex portion 13b is 1.5 mm, that is, in the circumferential length of the metal cap 10 having a diameter of 38 mm, the ratio of the convex portion 13b occupying the set of the concave portion 13a and the convex portion 13b is set to 0.05. Thus, a convex portion 13b having a size that does not cause pain to the hand grasped at the time of opening is formed. If the circumferential length and the ratio of the convex portion 13b are smaller than this, the convex portion 13b becomes extremely small, so that the convex portion 13b may bite into the hand at the time of opening and may cause pain, which is not preferable.
[0028]
In addition, since the metal cap 10 has a cylindrical shape similar to the base part 101 of the bottle 100, the cylindrical part 11, the liner 15, and the top plate 12 are also easily attached to the bottle 100, and have good hermeticity. Can be obtained.
[0029]
Next, a second embodiment of the present invention will be described with reference to FIG. The metal cap 20 according to the present embodiment is formed of the same material as the metal cap 10 according to the first embodiment and is similarly formed. The difference between the metal cap 20 and the metal cap 10 of the first embodiment is that the circumferential length x2 (mm) of the concave portion 23a constituting the knurl 23 and the circumferential length y2 (mm) of the convex portion 23b. And the ratio,
y2 / (x2 + y2) = 0.12 and y2 = 3.5 (mm)
It has become. Further, the concave portions 23a and the convex portions 23b are uniformly arranged in the circumferential direction of the metal cap 20 as shown in FIG.
Similarly to the metal cap 10, a vent hole 23c having the same circumferential length as the concave portion 23a is formed in the upper portion of the concave portion 23a.
[0030]
In the present embodiment, the circumferential length of the convex portion 23b is longer than that of the metal cap 10 of the first embodiment, and the ratio thereof is large, so that the area of the convex portion 23b that corresponds to a finger when gripped is large, It is difficult to cut into your fingers.
[0031]
Next, a third embodiment of the present invention will be described with reference to FIG. The metal cap 30 according to the present embodiment is formed in the same manner from the same material as the metal caps 10 and 20 according to the above embodiments. The difference between the metal cap 30 and the metal caps 10 and 20 of the above embodiments is that the circumferential length x3 (mm) of the concave portion 33a constituting the knurl 33 and the circumferential length y3 (mm) of the convex portion 33b. ) And ratio,
y3 / (x3 + y3) = 0.34 and y3 = 10 (mm)
It has become. Further, the concave portions 33a and the convex portions 33b are arranged uniformly in the circumferential direction of the metal cap 30, as shown in FIG.
Further, similarly to the metal caps 10 and 20, a vent hole 33c having the same circumferential length as the concave portion 33a is formed in the upper portion of the concave portion 33a.
[0032]
In the present embodiment, the circumferential length of the convex portion 33b is longer than the metal caps 10 and 20 of each of the above embodiments, that is, 10 mm, and the ratio thereof is large. Is large and difficult to penetrate the finger. Since the convex portion 33b is smooth, increasing the circumferential length of the convex portion 33b further increases the portion where the friction with the metal cap 30 is small and the finger does not get caught, thereby reducing grip. It is not preferable because it leads to
[0033]
Next, a fourth embodiment of the present invention will be described with reference to FIG. The metal cap 40 according to the present embodiment is formed by using the same material as the metal caps 10, 20, and 30 according to the above embodiments. The metal cap 40 is different from the metal caps 10, 20, 30 of the above embodiments in the number of the concave portions 43a and the convex portions 43b constituting the knurl 43 and the circumferential direction of the concave portions 43a and the convex portions 43b. Length and ratio.
[0034]
That is, in the metal cap 40, the sixteen concave portions 43a and the convex portions 43b are uniformly arranged alternately in the circumferential direction of the metal cap 40. When the circumferential length of these concave portions 43a is x4 (mm) and the circumferential length of the convex portions 43b is y4 (mm),
y4 / (y4 + x4) = 0.12 and y4 = 3.5 (mm)
It has become.
Further, similarly to the metal caps 10, 20, and 30, a vent hole 43c having the same circumferential length as the concave portion 43a is formed above the concave portion 43a.
[0035]
In the metal cap 40 of the present embodiment, the knurl 43 is provided with a concave and convex shape composed of 16 sets of concave portions 43a and convex portions 43b, which is larger than the metal caps 10, 20, and 30 of the above embodiments. Even if the user does not consciously hold the metal cap 40 in accordance with the position of the protrusion 43b, the finger can be put on any of the protrusions 43b simply by grasping the metal cap 40. Further, since the circumferential length of the convex portion 43b is smaller than that of the concave portion 43a, the peripheral surface of the metal cap 40 has a shape that is less slippery when gripped, unlike a polygonal shape.
[0036]
Next, a fifth embodiment of the present invention will be described with reference to FIG. The metal cap 50 according to the present embodiment is formed by using the same material as the metal caps 10, 20, 30, and 40 according to the above-described embodiments. The difference between the metal cap 50 and the metal cap 40 of the fourth embodiment is the circumferential length and ratio of the concave portion 53a and the convex portion 53b constituting the knurl 53.
[0037]
That is, in the metal cap 50, the sixteen concave portions 53a and the convex portions 53b are uniformly arranged alternately in the circumferential direction of the metal cap 50. When the circumferential length of these concave portions 53a is x5 (mm) and the circumferential length of the convex portions 53b is y5 (mm),
y5 / (y5 + x5) = 0.5 and y5 = 3.75 (mm)
It has become.
Similarly to the metal caps 10, 20, 30, and 40, a vent hole 53c having the same circumferential length as the concave portion 53a is formed on the upper portion of the concave portion 53a.
[0038]
In the metal cap 50 of the present embodiment, the knurl 53 is provided with a concave and convex shape composed of 16 sets of concave portions 53a and convex portions 53b, which is larger than the metal caps 10, 20, and 30 of the above embodiments. Even if the user does not consciously hold the metal cap 50 in accordance with the position of the convex portion 53b, the finger can be put on any of the convex portions 53b simply by grasping the metal cap 50.
In addition, since the ratio of the circumferential length occupied by the convex portion 53b in the set of the concave portion 53a and the convex portion 53b is larger than that of the metal cap 40, the finger is less likely to bite when gripped than the metal cap 40. In addition, since the convex portion 53b is smooth, increasing the circumferential length of the convex portion 53b further increases the portion where friction with the metal cap 50 is small and a finger is not caught, and the metal cap 50 is enlarged. It is not preferable because it is close to an approximate cylindrical shape and leads to a decrease in grip performance.
[0039]
As described above, according to the metal cap according to each embodiment of the present invention, the number of the concave portions and the convex portions constituting the knurl is small, and the circumferential length of each concave portion is large, thereby impairing the sealing performance of the bottle. Without removing the cap, the metal cap and the bottle can have a good grip at the time of opening. And the bottle equipped with this metal cap has good grip of the cap and is easy to open and close.
[0040]
The components, their shapes, combinations, and the like shown in the above embodiments are merely examples, and can be variously changed based on design requirements without departing from the spirit of the present invention.
For example, in the above embodiment, each vent hole is provided with the same circumferential length of the concave portion, and good venting performance is obtained by the large vent hole, but the upper and lower vent holes of the cap body are connected only by the convex portion. Therefore, the strength may be insufficient. Therefore, in order to secure the strength of the metal cap, a vent hole is provided in a part of the concave part with a circumferential length smaller than the concave part, or a vent hole is provided intermittently in one concave part along the circumferential direction. May be adopted.
[0041]
【The invention's effect】
As described above, according to the metal cap according to the first aspect of the present invention, since the number of the concave portions and the convex portions is small, the circumferential length of each concave portion and the convex portion is increased, and the concave and convex portions are formed. Since the shape formed by the step and easily receiving the force in the direction of rotating the cap is provided at a certain interval, the force applied to the cap can be efficiently applied to the opening and closing of the cap, and the opening and closing Can be realized easily.
[0042]
According to the metal cap according to the second aspect of the present invention, the vent hole has a circumferential length substantially equal to that of the concave portion, so that gas is released from the container prior to removal of the cap when the cap is opened, thereby reducing the pressure difference between inside and outside. Vent holes can be provided in a sufficient size without being noticeable.
[0043]
According to the metal cap according to the third and fourth aspects of the present invention, the circumferential length of the convex portion can be made appropriate, so that the circumferential length of the convex portion is too small and the convex portion is sharp. It is possible to avoid such a problem that the circumferential length of the convex portion is too large and the peripheral surface of the cap becomes an approximately circular shape and the grip performance is deteriorated.
[0044]
According to the metal cap according to the fifth aspect of the present invention, since the concave portions and the convex portions are uniformly arranged, a metal cap having good gripping properties and gas releasing properties can be realized at any position on the peripheral surface. .
[0045]
According to the bottle according to the sixth aspect of the present invention, since the metal cap with good grip and degassing property is attached, the hand does not slip when opening and closing, and is not opened while the container internal pressure is high. Thus, a bottle that is easy to handle can be realized.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a metal cap according to a first embodiment of the present invention.
FIG. 2 is a top view showing a schematic shape of a knurl portion of the metal cap shown in FIG. 1;
FIG. 3 is a view showing a bottle equipped with the metal cap shown in FIG. 1;
FIG. 4 is a top view showing a schematic shape of a knurl portion of a metal cap according to a second embodiment of the present invention.
FIG. 5 is a top view showing a schematic shape of a knurl portion of a metal cap according to a third embodiment of the present invention.
FIG. 6 is a top view illustrating a schematic shape of a knurl portion of a metal cap according to a fourth embodiment of the present invention.
FIG. 7 is a top view showing a schematic shape of a knurl portion of a metal cap according to a fifth embodiment of the present invention.
[Explanation of symbols]
10, 20, 30, 40, 50 Metal cap 11 Tube part 12 Top plate 13, 23, 33, 43, 53 Knurl 13a, 23a, 33a, 43a, 53a Concave parts 13b, 23b, 33b, 43b, 53b Convex part 13c , 23c, 33c, 43c, 53c Vent hole 100 bottle

Claims (6)

A substantially cylindrical tubular portion and a top plate closing one end of the tubular portion were integrally formed of a metal plate material, and the tubular portion was provided with a knurl composed of a plurality of concave portions and convex portions alternately arranged in the circumferential direction. A metal cap,
A metal cap, wherein 4-16 sets of the concave portions and the convex portions are arranged in a circumferential direction. The metal cap according to claim 1, wherein a vent hole formed by cutting the cylindrical portion in a circumferential direction is provided in each of the concave portions with a substantially equal circumferential length. The metal part according to claim 1, wherein the ratio of the circumferential length of the convex portion to the circumferential length of the set of the concave portion and the convex portion is 0.05 to 0.5. 4. cap. The metal cap according to any one of claims 1 to 3, wherein a circumferential length of the projection is 1.5 to 10 mm. The metal cap according to any one of claims 1 to 4, wherein the concave portions and the convex portions are uniformly arranged in a circumferential direction of the cylindrical portion. A bottle provided with the metal cap according to any one of claims 1 to 5.

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