JP4074178B2 - Bottle can and bottle can with cap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottle can for sealing a cap by attaching a cap to the cap of the bottle can, and a bottle can with a cap to which the cap is attached.
[0002]
[Prior art]
In general, a bottle can widely used as a beverage can is formed by drawing a metal plate made of aluminum or an alloy thereof and then performing an ironing process (Ironing). being called.
[0003]
Such a bottle can is conventionally formed into a bottomed cylindrical shape, and then, as shown in FIG. 5, the opening of the bottle can 1 is neck-formed to reduce the diameter to form the base portion 2. Then, the base part 2 is threaded to form thread parts (male threads) 3 and. When the temper evidence part 4 is formed, the curled part 5 is formed by curl forming that turns the opening end of the base part 2 from the inside to the outside. The curled part 5 has an inner peripheral wall 5a provided continuously to the base part 2, an outer peripheral wall 5b provided on the outer side of the inner peripheral wall 5a, and a connecting part 5c for connecting both 5a and 5b.
[0004]
When the contents of the bottle can 1 thus formed are filled, the cap material 6 is attached to the base 2 of the bottle can 1 as shown in FIG. .
[0005]
That is, as shown in FIG. 7, a cylindrical pressure block 71, a pressure block insert 72 provided in the center of the pressure block 72 so as to be movable in the axial direction, an RO roller 73, and a PP roller 74 were provided. Using the capping device 7, as shown in FIG. 8A, the pressure block insert 72 presses and holds the top surface portion 61 of the cap material 6 covered on the cap portion 2 of the bottle can 1 in the direction of the bottom of the can. Next, as shown in FIG. 8 (b), the pressure block 71 is drawn in the desired depth and radial direction while pressing the outer peripheral side of the top surface portion 61 in the direction of the bottom of the can. In this state, the RO roller 73 rotates along the screw part 3 of the base part 2 to form a female screw around the cap material 6 and PP. As the roller 74 rolls along the temper evidence part 4, the flare 66 on the opening end side of the cap material is tightened (clamping process), whereby the cap material 6 is attached to the base part 2 as shown in FIG. 6. The liner 67 mounted in the cap member 6 is in close contact with the curled portion 5 of the base portion 2, so that a sealing property that prevents the contents from leaking is obtained. Here, the one before being attached to the bottle can 1 is referred to as “cap material 6”, and the one after being attached is referred to as “cap 6”. Here, in FIG. 8, reference numeral 75 denotes a spring that urges the pressure block insert 72 toward the bottom of the can.
Prior art document information related to the sealing between the bottle can and the cap includes the following.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-10627
[Problems to be solved by the invention]
The bottle can 1 can be closed again (called reseal) once the cap 6 that has been attached is opened, and at that time, the female screw of the cap 6 is moved from the screw start position 31 of the screw portion 3. By screwing, the contents can be resealed so as not to leak.
[0008]
Incidentally, as shown in FIG. 6, the conventional bottle can 1 is formed with a screw introduction / extraction portion 90 for attaching and detaching the cap 6 to the screw start position 31 of the screw portion 3 as shown in FIG. 9. FIG. 9 is a cross-sectional view corresponding to the line AA in FIG. 6 and shows the periphery of the screw introduction / extraction part 90 provided between the screw part 3 and the curl part 5.
As shown in FIG. 9, a screw introduction / extraction portion 90 is provided between the screw portion 3 and the curl portion 5 via a recess 8. However, since the screw introduction / extraction portion 90 projects outward, the cap 6 When the cap is closed, the cap 6 is caught by the screw introduction / extraction portion 90, and the cap 6 cannot be resealed well, and there is a problem that a stronger torque is required.
[0009]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bottle can and a bottle can with a cap that can re-seal a cap satisfactorily.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention proposes the following means.
According to the first aspect of the present invention, a screw portion is provided around the base portion toward the bottom of the can, a curled portion is formed at the opening end of the base portion, and a recess portion is interposed between the screw portion and the curled portion. in a bottle can in which a threaded inlet and outlet portions Te, the threaded inlet and outlet portions, the thread-starting position of the screw portion in the base part, there in the range of 90 ° from 45 ° in the direction opposite to the winding direction of the threaded portion And when the height protruding outward from the line connecting the first intersection point and the second intersection point in the base part is L, the first intersection point is formed in a range of 0 ≦ L ≦ 0.3 mm. The line perpendicular to the can axis passes through the tip of the outer peripheral wall of the curl portion that is closest to the bottom of the can and intersects the surface of the base portion, and the second intersection point is the winding of the screw portion from the screw start position . Inflection connecting the threaded portion of the screw introduction / extraction part opposite to the direction and the recess It is the position which cross | intersects the 1st tangent which passes a point, and the 2nd tangent which passes the inflection point between the said dent part and a screw introduction / exit part.
[0011]
According to the bottle can of the present invention, since the maximum height L of the screw introduction / extraction part is formed in the range of 0 ≦ L ≦ 0.3 mm, the height of the screw introduction / extraction part is the screw start of the screw part. Therefore, when the cap that has been opened once is closed, the cap is not caught and the torque at the time of resealing is reduced, so that the cap can be resealed satisfactorily. .
[0012]
According to a second aspect of the present invention, in the bottle can according to the first aspect, the screw introducing / extracting portion is configured such that the second tangent and an angle formed by a straight line parallel to the can axis is θ. The tangent is formed so as to satisfy −20 ° ≦ θ ≦ −5 ° in a direction away from the can axis with respect to a straight line parallel to the can axis.
According to the bottle can according to the present invention, the screw introducing / extracting portion is formed in the range of −20 ° ≦ θ ≦ −5 ° so that the θ can be substantially equal to or lower than the recessed portion, The cap can be easily screwed into the threaded portion, and a good reseal can be performed accurately.
[0013]
The invention according to claim 3 is characterized in that a cap is attached to the cap portion of the bottle can according to claim 1 or 2.
According to the bottle can with a cap according to the present invention, the cap can be smoothly closed, and the cap can be resealed satisfactorily.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 3 are views showing a bottle can according to an embodiment of the present invention, and FIG. 1 is an explanatory view showing a periphery of a screw introduction / extraction part provided between a screw part and a curl part in a bottle can base part. FIGS. 3 and 3 are enlarged explanatory views showing the curled portion in FIG.
As shown in FIGS. 5 to 8 described above, the bottle can of this embodiment is reduced in diameter to the opening side of the can body to form the base portion 2, and a screw portion (male screw) around the base portion 2. 3 is formed, a temper evidence part 4 is formed on the bottom side of the can, and a curl part 5 is formed by folding the tip end of the base part 2 from the inside to the outside. A capping device 7 is formed on the base part 2. By attaching the cap material 6 by the above, the bottle can 1 with the cap is configured. As shown in FIG. 3, the curled portion 5 includes an inner peripheral wall 5a that is connected to the base portion 2 and extends to the opening end, an outer peripheral wall 5b that is provided outside the inner peripheral wall 5a, and both 5a and 5b. The outer peripheral wall 5b is further slot processed to form a substantially flat shape. A hook 5d that bends toward the inner peripheral wall 5a is provided at the tip of the outer peripheral wall 5b.
[0015]
The base part 2 is provided with a screw introduction / extraction part 90 between the screw part 3 and the curl part 5. As shown in FIG. 1, the screw introduction / extraction part 90 is provided between the screw thread 3 a of the screw part 3 and the curl part 5 via the recess part 8, and the first intersection 91 in the base part 2 and the second It protrudes outward from a line 93 connecting the intersection 92, and the maximum height L of the protrusion is set to a predetermined range so as to be substantially equal to or lower than that of the recessed portion 8.
[0016]
In this case, as shown in FIG. 3, the first intersection 91 has a line H orthogonal to the can axis passing through the tip 94 on the most bottom side of the hook 5 d of the curled portion 5 and the outer surface of the base portion 2. It is a crossing position. As shown in FIG. 1, the second intersection 92 is a position that intersects the first tangent line 95 passing through the inflection point X and the second tangent line 96 passing through the inflection point Y. As shown in FIG. 1, the inflection point X includes a convex arc of the screw thread 3 a of the screw introduction / extraction portion 90 in the direction opposite to the winding direction of the screw portion from the screw start position 31 and a concave arc of the recess portion 8. The inflection point Y is a point in the vicinity of the connection portion between the concave arc of the recess portion 8 and the convex arc of the screw introduction / extraction portion 90.
These inflection points X and Y are obtained as follows.
That is, the contour line a of the can body 1 shown in FIG. 2 obtained by a measuring instrument to be described later is converted into CAD data. In this CAD data image, vertical lines b1, b2, perpendicular to the can axis at intervals of 10 μm in the can axis direction. ..., bn is calculated. Among these vertical lines, the vertical line b1 at the highest position in the can axis direction is set, for example, at the lower end of the curled portion 5. Then, the tangent lines that contact the intersection points a1 to an of each of the vertical lines b1 to bn and the contour line a are respectively calculated, and the extending direction of each tangent line approaches or separates from the can axis. Let the inflection point be the intersection of the changing boundaries. For example, in FIG. 2, the inflection points of the screw introduction / extraction part 90 are the intersection point a6 and the intersection point a8. That is, the tangent line from the intersection point a1 to the intersection point a5 at the highest position in the can axis direction extends in a direction away from the can axis, and at the intersection point a6, the tangent line extends in a direction approaching the can axis. The direction is changing. Further, the tangent at the intersection point a8 extends in the same direction as the intersection point a6, and the direction changes so that the tangent line extends in a direction away from the can shaft at the intersection point a9. Of these inflection points, that is, the intersection points a6 and a9, the inflection point Y is a point in the vicinity of the connecting portion between the concave arc of the recess 8 and the convex arc of the screw introduction / extraction portion 90 as described above. , The intersection point a9.
[0017]
Such a screw introduction / extraction part 90 is not shown in detail, but from the screw start position 31 of the screw part 3 in the base part 2 to a range returned by 45 ° in the direction opposite to the winding direction, or from 45 ° to The range is set back by 90 °, and is slightly higher than the line 93. For example, when the screw part 3 provided in the base part 2 is configured to have 1.7 turns, the height L of the screw introduction / extraction part 90 is 0 on the line 93 connecting the first intersection 91 and the second intersection 92. It is formed in a size of 0.1 to 0.3 mm when formed in a size of .5 to 0.7 mm, and 2.2 volumes.
[0018]
Further, in FIG. 1, the screw introduction / extraction portion 90 is formed such that an angle θ formed by a second tangent line 96 passing through the inflection point Y and a straight line O parallel to the can axis is within a predetermined range. . That is, the second tangent line 96 is formed so as to satisfy −20 ° ≦ θ ≦ −5 ° outward (in a direction away from the can shaft) with respect to the straight line O parallel to the can shaft. Accordingly, the screw introduction / extraction portion 90 is substantially equal to the position of the straight line parallel to the can axis passing through the second intersection 92 described above or inclined toward the can axis side with respect to the direction along the cross section of the can body. Is formed. The angle θ is, for example, 0 ° to 1.1 ° when the number of turns of the screw portion 3 is 1.7, and −10 ° to −13 ° when the number of turns is 2.2.
1 and 3, the same parts as those in FIGS. 5 to 9 are denoted by the same reference numerals.
[0019]
Since the bottle can 1 of this embodiment is configured as described above, after the user opens the cap 6 and drinks it from a cap can with the cap 6 wound around the base 2. The user reseals the cap by screwing the cap 6 onto the screw portion 3 in order to reseal the cap to the base portion 2 of the bottle can 1.
[0020]
At that time, the height L of the screw introduction / extraction portion 90 formed between the screw portion 3 and the curl portion 5 of the base portion 2 via the recess portion 8 is formed to be substantially equal to or lower than that of the recess portion 8. 9 is lower than the conventional screw introduction / extraction portion 90 shown in FIG. 9, when the cap 6 is screwed onto the screw portion 3 from the screw introduction / extraction portion 90 side and resealed, the female screw of the cap 6 is inserted into the screw portion 3. The screw start position 31 can be easily guided. Thereby, at the time of resealing, the cap 6 is not caught on the screw introducing / extracting portion 90 and the resealing torque is reduced, so that the cap 6 can be satisfactorily closed.
[0021]
In addition, since the screw introduction / extraction part 90 is formed so that the angle θ falls within the predetermined range described above, the screw introduction / extraction part 90 corresponds to the first direction described above with respect to the direction along the cross section of the can body. It is possible to realize a configuration that is substantially the same as the position of a straight line parallel to the can axis passing through the two intersections 92 or is inclined toward the can axis. Thereby, at the time of resealing, not only the introduction of the cap 6 but also the derivation can be performed reliably and satisfactorily, and the usability for the user is extremely good.
[0022]
Incidentally, as the screw introduction / extraction part 90, the height L is 0.1, 0.2, 0.3, and 0.4 mm, respectively, and the reseal torque when they are formed at various angles θ. The test results are shown in FIG. In the test, a measuring instrument (CDH-400 made by Mitutoyo) called a tracer was used, and its contact (tip radius: 0.022 mm, outer shape: 3Φ mm, tip angle: 12 °) was 0.2 mm / The height L dimension is obtained by scanning between the screw thread 3a of the screw introduction / extraction portion 90 and the tip 94 of the curl hook 5d in the direction opposite to the winding direction of the screw portion from the screw start position of the screw portion at a speed of s. And the angle θ was measured. Moreover, the torque measuring device was used for the reseal torque of the cap.
[0023]
In FIG. 4, “◯” in the reseal torque column means that the torque is less than 19.6 N · cm and reseal is performed at a low torque, and “×” indicates that a high torque greater than the above value is required. Means.
According to FIG. 4, when the height L is 0.4 mm, the reseal torque becomes large regardless of the angle θ, and although not shown, when the height L is 0 mm, Since similar results are obtained, it can be seen that 0 ≦ L ≦ 0.3 mm may be satisfied. On the other hand, when the angle θ is as small as −23 °, or as large as −3 ° or 0 °, the reseal torque becomes large at any height L, so −20 ° ≦ θ It can be seen that a range of ≦ −5 ° is sufficient. Therefore, as apparent from FIG. 4, the height L of the screw introduction / extraction portion 90 is in the range of 0 ≦ L ≦ 0.3 mm, and the angle θ is −20 ° ≦ θ ≦ −5 °. It may be in the range, preferably -13 ° to -10 °.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the opened cap is closed to the bottle can, the cap is not caught and the reseal torque is reduced, so that the cap can be improved. The effect of resealing is obtained.
[0025]
According to the second aspect of the invention, since the angle θ of the screw introduction / extraction part can be recessed from the recess part, the cap can be easily screwed into the screw part, and a good reseal can be achieved. The effect which can be performed exactly is acquired.
[0026]
According to the invention which concerns on Claim 3, since the reseal of a cap can be performed favorably, the effect which can provide the bottle can with a cap excellent in the reseal characteristic is acquired.
[Brief description of the drawings]
[1] A diagram showing a bottle can in accordance with one embodiment of the present invention, cross-section a threaded inlet and outlet portions of the winding direction opposite to the direction of the threaded portion from the thread-starting position of the screw portion of the mouth section of the bottle can It is explanatory drawing of the principal part.
FIG. 2 is an explanatory diagram for explaining a method of calculating an inflection point.
FIG. 3 is an enlarged explanatory view showing a curled portion in FIG. 1;
FIG. 4 is an explanatory diagram showing various test results of the bottle can obtained by the present invention.
FIG. 5 is an explanatory view showing a curled portion provided in a base portion of a bottle can.
FIG. 6 is an explanatory view showing a state in which a cap is attached to the cap portion of the bottle can.
FIG. 7 is an explanatory diagram when a cap is attached to a cap portion of a bottle can by a capping device.
FIG. 8 is a view when the capping device attaches a cap, and (a) is an explanatory view showing a state in which the cap material is pressed against the bottle can, and (b) is a diagram showing a step portion and a female screw on the cap material. It is explanatory drawing formed.
FIG. 9 is a cross-sectional view corresponding to the line AA in FIG. 6 and is an explanatory view showing the periphery of the introduction / extraction part between the screw part and the curl part in the conventional bottle can cap part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Can body 2 Cap | bolt part 3 Screw part 31 Screw start position 3a of screw part Screw thread 5 of the screw introduction / extraction part in the direction opposite to the winding direction of the screw part from the screw start position Curl part 8 Depression part 90 Screw introduction / extraction part 91 1 intersection point 92 2nd intersection point 93 Line 94 connecting the first intersection point and the second intersection point Tip 95 in the bottom direction of the curl portion Thread and recess of the screw introduction / extraction portion in the direction opposite to the winding direction of the screw portion from the screw start position First tangent line 96 passing through the inflection point between the parts Second tangent line X passing through the inflection point between the recess and the screw introduction / extraction part Thread of the screw introduction / extraction part in the direction opposite to the winding direction of the screw part from the screw start position Inflection point Y between indentations Inflection point between indentations and introduction and exit

Claims (3)

A screw part is provided around the base part toward the bottom of the can, a curl part is formed at the opening end of the base part, and a screw introduction / extraction part is provided between the screw part and the curl part via a recessed part. In bottle cans,
The threaded inlet and outlet portions, the thread-starting position of the screw portion in the base part, a first intersection point in a range of 90 ° from 45 ° in the direction opposite to the winding direction of the threaded portion, and the base part, the When the height protruding outward from the line connecting the two intersections is L, it is formed in the range of 0 ≦ L ≦ 0.3 mm,
The first intersection point is a position where a line perpendicular to the can axis passes through the tip on the most bottom side of the outer peripheral wall of the curled part and intersects the surface of the base part,
The second intersection point includes a first tangent line passing through an inflection point connecting a screw thread of a screw introduction / extraction portion in a direction opposite to a winding direction of the screw portion from the screw start position and the depression, and the depression and screw introduction / extraction. A bottle can characterized by being a position intersecting a second tangent line passing through an inflection point between parts. The bottle can according to claim 1,
When the angle between the second tangent and a straight line parallel to the can axis is θ, the second tangent is separated from the can axis with respect to the straight line parallel to the can axis. It is formed so that it may be set to -20 degrees <= theta <-5 degrees in the direction to do.   A bottle can with a cap, wherein the cap is attached to the cap portion of the bottle can according to claim 1 or 2.

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