JP2018177300A - Method of manufacturing pill fur proof cap, manufacturing apparatus and pill fur proof cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a pilfer proof cap, a manufacturing apparatus and a pilfer proof cap capable of suppressing the occurrence of bridge breakage. SOLUTION: An upper bead and a lower bead protruding outward in the radial direction of the skirt portion of a cap body including a top surface portion and a skirt portion, and a circumference of the skirt portion between the upper bead and the lower bead. A method for manufacturing a pilfer-proof cap in which a plurality of slits and a plurality of bridges alternately arranged in a direction are formed, and a cap material molding for forming a cap material including a cylindrical portion serving as a top surface portion and a skirt portion. In the process, the upper bead, the lower bead, and the bent portion that bends inward in the radial direction between the upper bead and the lower bead are formed on the cylindrical portion of the cap material along the circumferential direction of the cylindrical portion. The bead forming step is provided, and after the bead forming step, a slit forming step of forming a plurality of slits and a plurality of bridges in the bent portion is provided. [Selection diagram] Fig. 5

Description

  The present invention relates to a method of manufacturing a pill fur proof cap for sealing a container for drinks etc., a manufacturing apparatus and a pill fur proof cap.

  As a cap attached to a container made of steel, aluminum alloy or the like, a plurality of slits formed at predetermined intervals in the circumferential direction of the cap at the lower end portion of the skirt portion hanging down from the periphery of the top surface portion A pill fur proof cap with a bridge located between is known. The slits and the bridge are formed between an upper bead and a lower bead circumferentially formed in the skirt portion of the cap. The pill fur proof cap is cut off by the bridge being broken when the lower end of the cap is engaged with the bulging portion of the container opening, and only the portion located above the bridge is removed from the container It is removed and the part left below the bridge remains in the container.

  In such a pill fur proof cap, as shown in Patent Document 1, for example, a plurality of slits and a plurality of bridges form a cap material in which an aluminum alloy plate or the like is formed in a cup shape, The cap material is held between the outer tool on which a plurality of cutting edges are formed and the inner tool fitted to the inner peripheral surface of the cap material, and is rolled along with the inner tool along with the inner tool. It is formed by

JP, 2011-143973, A

  By the way, in the structure described in Patent Document 1, the inner tool is provided with an upper bead molding convex portion and a lower bead molding convex portion. In addition, the outer tool includes a plurality of cutting edges formed at intervals in the circumferential direction, a plurality of bridge accommodating portions disposed between the cutting edges for accommodating the bridge at the time of molding, and the cutting edges. An upper bead accommodating portion for accommodating an upper bead formed on the upper side of the lower bead receiving portion; and a lower bead accommodating portion for accommodating a lower bead below the cutting edge portion. Therefore, in the configuration of Patent Document 1, the upper bead and the lower bead are formed by rolling the cap material along with the inner tool along the outer tool, and a slit and a bridge are formed between these beads. .

However, in the configuration of Patent Document 1, since the slit is formed while forming the upper bead and the lower bead, a tensile force acts on the cap material in the vicinity of the position where the slit is to be formed. The bridge may break. Further, even when the bridge is not broken at the time of molding, the bridge may be broken at the time of attachment to a container or the like.
For this reason, a pill fur proof cap that can suppress the occurrence of bridge breakage is desired.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a method for manufacturing a pill fur proof cap, a manufacturing apparatus, and a pill fur proof cap capable of suppressing occurrence of bridge breakage.

  The method of manufacturing a pill fur proof cap according to the present invention projects radially outward of the skirt portion to the skirt portion of the cap main body provided with a top surface portion and a skirt portion substantially hanging from the periphery of the top surface portion. It is alternately arranged in the circumferential direction of the skirt portion between the upper bead, and the lower bead projecting radially outward of the skirt portion below the upper bead, and between the upper bead and the lower bead. What is claimed is: 1. A method of manufacturing a pill fur proof cap having a plurality of slits and a plurality of bridges, comprising: forming a cap material including a cylindrical portion to be the top surface portion and the skirt portion; Material, the upper bead, the lower bead, and a bent portion which is bent inward in the radial direction of the cylindrical portion between the upper bead and the lower bead; Comprising a bead forming step of forming along a direction, after said bead forming step, a slit forming step of forming a plurality of slits and the plurality of bridges to the bending portion.

  As described above, after the upper bead, the lower bead, and the bent portion formed between the beads are formed in the cylindrical portion of the cap material, a plurality of slits are formed in the bent portion, so in the slit forming step, The tensile force acting in the vicinity of the position where the slit is formed can be reduced. Therefore, bridge breakage at the time of manufacture of the pill fur proof cap can be suppressed.

  The apparatus for manufacturing a pill fur proof cap according to the present invention projects outward in the radial direction of the skirt section to the skirt section of the cap body provided with a top surface section and a skirt section substantially hanging from the periphery of the top surface section. It is alternately arranged in the circumferential direction of the skirt portion between the upper bead, and the lower bead projecting radially outward of the skirt portion below the upper bead, and between the upper bead and the lower bead. An inner tool for fitting a cap material comprising a cylindrical portion serving as the top surface portion and the skirt portion, which is a manufacturing apparatus of a pill fur proof cap in which a plurality of slits and a plurality of bridges are formed, and the inner tool The cap material pressed by the roller is rolled together with the inner tool, thereby sandwiching the cap material with the inner tool An outer tool for forming the lower bead, the inner tool includes a lower bead forming convex portion for forming the inner surface of the lower bead, an upper bead forming convex portion for forming the inner surface of the upper bead, and A relief groove formed in a concave shape between the upper bead molding convex portion and the lower bead molding convex portion, and disposed radially inward of the upper bead molding convex portion and the lower bead molding convex portion in the clearance groove portion A first cutting edge portion for forming the plurality of slits, and the outer tool rolls a first region for rolling the cap material together with the inner tool, and rolling the first region And a second region for rolling the cap material further, and the first region deforms the cylindrical portion between the upper bead forming convex portion and the upper bead forming outer surface of the upper bead. A bead molding part and the lower part Between the lower bead and the upper bead, and bent radially inward, by deforming the cylindrical portion between the mold forming convex portion and forming the outer surface of the lower bead, and between the lower bead and the upper bead Forming the outer surface of the bent portion, and the second region cuts the bent portion formed in the first region with the first cutting edge portion A plurality of second cutting edges forming the slit are provided.

According to such a configuration, when the cap material fitted with the inner tool is rolled against the first region of the outer tool, the upper bead and the lower bead are formed on the cylindrical portion of the cap material . Under the present circumstances, the site | part (site between an upper bead and a lower bead) located between the site | part pressed by the upper bead molding convex part and the site | part pressed by the lower bead molding convex part is a bending part molding convex part , And is accommodated in the relief groove of the inner tool in a state of being recessed in the direction opposite to the direction pressed by each bead forming convex portion. For this reason, a radially inward bent portion is formed between the upper bead and the lower bead.
Then, when the cap material obtained by rolling the first region of the outer tool is rolled while pressing against the second region of the outer tool, the second cutting blade portion approaches the first cutting blade portion, and the first cutting blade portion And a part of bending part is torn by each of a 2nd cutting blade part, and a slit is formed. In addition, since the bridge left between the adjacent slits is formed by the bending portion, it is bent radially inward.

  In the manufacturing apparatus of the present invention, bead forming and slit forming can be performed separately by rolling the cap material fitted with the inner tool sequentially from the first region to the second region of the outer tool, so that the bridge is broken. Can be efficiently produced.

  The pill fur proof cap according to the present invention comprises a cap main body having a top surface and a skirt substantially hanging from the peripheral edge of the top surface, and an upper bead projecting radially outward of the skirt. And a plurality of slits alternately arranged in a circumferential direction of the skirt portion between the upper bead and the lower bead, and a lower bead protruding radially outward of the skirt portion below the upper bead. And a plurality of bridges, wherein the plurality of bridges are formed radially inward of the skirt portion relative to the upper bead and the lower bead in a longitudinal sectional view of the skirt portion. It is bent.

  Since the plurality of bridges of such a pill fur proof cap are bent inward in the radial direction of the skirt portion relative to the upper bead and the lower bead, when the pill fur proof cap is attached to the container opening etc. Even when the portion of the skirt portion near the bridge is pulled, the bent portion of the bridge extends and changes in a substantially linear shape, whereby the tensile force can be relaxed. In addition, when the lower end of the skirt portion is squeezed and reduced in diameter at the time of mounting (it is wound around), a compressive stress is also generated, but the compressive stress is also reduced by the bridge being bent. it can. Therefore, breakage of the bridge of the pill fur proof cap at the time of attachment to the container opening can be suppressed.

  According to the present invention, after the bridge forming step of forming the upper bead, the lower bead and the bending portion, the bending portion is subjected to the slit forming step of forming the bridge positioned between the plurality of slits and the adjacent slits. Compared with the case where the bead, the lower bead, the plurality of slits and the bridge are formed at one time, the tensile force acting in the vicinity of the position where the slit is formed can be reduced, and the bridge breakage can be suppressed.

FIG. 5 is a side view with a half of the pill fur proof cap according to the embodiment of the present invention broken away. It is an arrow A top view of the pill fur proof cap shown in FIG. It is the side view which fractured the half of the cap material constituted by the cap material formation process of the pill fur proof cap in this embodiment. It is the side view which fractured the half of the cap material constituted by the bead formation process of the pill fur proof cap in this embodiment. It is a top view which shows typically the outer tool and inner tool which are used with the manufacturing apparatus of this embodiment. It is sectional drawing in alignment with the BB line of FIG. 5 which shows the positional relationship of the cylindrical part of the cap material before bead shaping | molding in this embodiment, and an outer tool and an inner tool. It is sectional drawing which follows the C-C line of FIG. 5 which shows the principal part of the outer tool in the bead formation in this embodiment, and an inner tool. It is the elements on larger scale of FIG. It is sectional drawing in alignment with the DD line of FIG. 5 which shows the principal part of the outer tool in the slit formation in this embodiment, and an inner tool.

Hereinafter, embodiments of a pill fur proof cap manufacturing method, a manufacturing apparatus, and a pill fur proof cap according to the present invention will be described with reference to the drawings.
The pill fur proof cap 3 (also referred to as a PP cap) of the present embodiment is attached to the mouth of an aluminum or aluminum alloy (metal) bottle can (a container according to the present invention) of 38 mm diameter, for example. It is a thing.

  FIG. 1 and FIG. 2 show the pill fur proof cap 3 before attaching to a bottle can, and the pill fur proof cap 3 is formed into a cup shape by forming a plate material of aluminum or aluminum alloy coated with inner and outer surfaces. And a liner 5 provided on the inner surface of the cap body 4. The cap body 4 includes a top surface portion 41 and a skirt portion 42 which is substantially suspended from the periphery of the top surface portion 41.

  The liner 5 is formed so as to abut on the mouth (not shown) of the bottle can when the bottle can is closed by the pill fur proof cap 3 and to seal the inside of the bottle can. The liner 5 is disposed on the inner surface side of the top surface portion 41 of the cap body 4, and the sliding layer 51 sliding on the inner surface of the top surface portion 41 and the sliding layer 51 directly or an intermediate layer such as a barrier layer. And a sealing layer 52 that is softer than the sliding layer 51 and has a smaller outer diameter. The sealing layer 52 is formed of an annular thick seal portion 54 in close contact with the mouth of the bottle can and a thin wall portion 55 formed on the inner side of the seal portion 54 and thinner than the seal portion 54. There is.

  At the lower part of the skirt portion 42, an upper bead 45 projecting radially outward of the skirt portion 42, and a lower bead 46 projecting radially outward of the skirt portion 42 below the upper bead 45 The upper bead 45 and the lower bead 46 are formed along the circumferential direction of the skirt portion 42. Further, between the upper bead 45 and the lower bead 46, a bending portion 47 which is bent inward in the radial direction of the skirt portion 42 is formed. The bent portion 47 is formed with a plurality of slits 48 formed intermittently in the circumferential direction, and a bridge 49 located between the adjacent slits 48. For this reason, the bridge 49 is bent inward in the radial direction of the skirt portion 42.

Such a skirt portion 42 has a cylinder upper portion 43 and a cylinder lower portion 44 which can be divided up and down by the plurality of slits 48 described above, and the cylinder upper portion 43 and the plurality of bridges 49 formed between adjacent slits 48 It is made into the shape which connected the cylinder lower part 44. As shown in FIG.
Among these, the lower portion 44 of the cylinder is locked to the lower surface of a bulging portion (not shown) provided at the container opening, and the cap body 4 is attached to the container opening. On the other hand, the cylindrical portion 43 is screwed into a screw provided at the container opening, and the cap main body 4 mounted on the container is rotated in the circumferential direction of the skirt portion 42 (direction in which the screw is released). When moved, the bridge 49 is broken, and the top surface portion 41 and the cylinder upper portion 43 of the cap body 4 are removed from the container, and the cylinder lower portion 44 is left in the container.

  Further, as shown in FIGS. 1 and 2, grooves 14 are formed in the upper part of the cap main body 4 along the circumferential direction, and a plurality of grooves 14 are arranged in the circumferential direction between the grooves 14 and the top surface 41. A knurled recess 11 and a plurality of hooks 13 having an opening 12 for releasing the internal pressure when opened are formed. An uneven surface is formed on the outer peripheral surface of the skirt portion 42 by arranging the knurled recess 11 and the hook portion 13 at an interval, thereby increasing the frictional resistance with the finger gripping the liner cap 3 at the time of opening. And can be easily opened.

  The hook portion 13 is a portion formed by pressing the upper portion divided by the opening portion 12 of the skirt portion 42 radially inward, and locks the liner 5 disposed on the top surface portion 41. Therefore, the distance from the top surface portion 41 to the radially inward end of the hook portion 13 is set to a distance larger than the thickness of the sliding layer 51. The inscribed circle C (see FIG. 2) formed by each hook portion 13 is set smaller than the outer diameter of the sliding layer 51 of the liner 5, and this sliding layer 51 is the hook portion 13 and the top surface portion. The liner 5 is supported by the hook portion 13 and attached to the cap body 4 by being disposed between the inner surface and the inner surface 41.

Next, a method of manufacturing the pill fur proof cap 3 of the present embodiment will be described with reference to FIGS. In this manufacturing method, the cap material forming process, the bead forming process and the slit forming process are provided, and the cap material 4A not having the upper bead 45, the lower bead 46, the bent portion 47, the plurality of slits 48 and the plurality of bridges 49 is provided. First, forming (cap material forming process), forming upper bead 45, lower bead 46 and bent portion 47 on the cap material 4A (bead forming step), upper bead 45, lower bead 46 and bent portion 47 are formed A plurality of slits 48 and a plurality of bridges 49 are formed in the cap material 4B (slit forming step).
In the following description, the cap main body 4 is in a state before the bead forming process, that is, in a state before the upper bead 45, the lower bead 46, the bent portion 47, the slit 48 and the bridge 49 are formed. The portion to be the skirt portion 42 in the cap member 4A is referred to as a cylindrical portion 42A. Further, a state before the slit forming process is referred to as a cap material 4B, and a portion to be the skirt portion 42 in the cap material 4B is referred to as a cylindrical portion 42B. Hereinafter, the steps will be described in order.

[Cap material forming process]
First, the inner and outer surfaces of a plate material (not shown) such as an aluminum alloy are coated. A lubricant is applied to the surface of the coated plate material, and punched into a cup shape by a press, as shown in FIG. 3, a cylindrical cylindrical portion suspended straight from the top surface portion 41 and the end portion of the top surface portion 41. A cap 4A having 42A is formed.

[Bead forming process]
In the bead forming process and the slit forming process, as shown in FIG. 5, the convex arc of the outer tool 7 is engaged with the outer tool 7 having the convex circular arc surface fixed to the apparatus main body and the cap members 4A and 4B. And an inner tool 6 rollable along the surface. In the case of this embodiment, the convex circular arc surface of the outer tool 7 is disposed continuously to the arc-shaped first area 7A and the first area 7A where the cap material 4A can roll for one or more rotations, and the cap material 4B And an arc-shaped second region 7B capable of rolling for one or more rotations. The bead forming process is performed by the inner tool 6 and the first area 7A of the outer tool 7, and the slit forming process is performed by the inner tool 6 and the second area 7B of the outer tool 7. Details will be described below.

(Configuration of inner tool)
The inner tool 6 is engaged with the cap members 4A and 4B from above with the top surface portion 41 of the cap members 4A and 4B positioned on the lower side and the cylindrical portions 42A and 42B positioned from the top surface portion 41 in the upper direction Be done. For this reason, although illustration is abbreviate | omitted in FIGS. 6-9, the top | upper surface part 41 is located in the lower side, and the front-end | tip of cylindrical part 42A, 42B is located in the upper side. Moreover, these FIGS. 6-9 have shown only the edge part vicinity of cylindrical part 42A, 42B. In the following description, in the drawings, the upward and downward directions are the same as the direction with respect to the paper surface.
As shown in FIGS. 6-9, the inner tool 6 is configured by laminating a plurality of disc-shaped plates, and the lower bead 46 is formed in a portion where each bead 45, 46 is formed in the cylindrical portion 42A. A lower bead plate 61 for molding the inner surface and an upper bead plate 62 for molding the inner surface of the upper bead 45 are provided.

  On the outer peripheral surface 611 of the lower bead plate 61, a lower bead forming convex portion 612 is formed which protrudes outward in the radial direction. As shown in FIG. 8, the lower bead forming convex portion 612 is formed in a triangular shape in a longitudinal sectional view, and a first inclined surface 613 inclined downward from the outer peripheral surface 611 in the radial direction, and And a second inclined surface 614 inclined from the end of the first inclined surface 613 toward the end surface 616 of the lower bead plate 61. An apex formed by the first inclined surface 613 and the second inclined surface 614 is formed by an arc-shaped surface 615.

In the upper bead plate 62, the outer peripheral end of the end surface 621 in contact with the end surface 616 of the lower bead plate 61 is provided with a gap between the second inclined surface 614 and the outer peripheral surface hanging from the end surface 621 and its outer peripheral end The ridge line 622 constitutes a first cutting edge portion 623.
Further, at a lower position than the first cutting edge portion 623, an upper bead forming convex portion 624 protruding outward in the radial direction from the outer peripheral surface 622 forming the first cutting edge portion 623 is formed. The upper bead molding convex portion 624 is formed in a shape in which the upper part of a substantially semicircle is cut away in a longitudinal cross sectional view, and is inclined with a first inclined surface 625 inclined downward outward from the outer peripheral surface 622 in the radial direction An arc-shaped surface 626 projecting radially outward from the outer peripheral end of the first inclined surface 625; and a second inclined surface 627 inclined from the end of the arc-shaped surface 626 toward the end surface 628 of the upper bead plate 62; Have. In the upper bead forming convex portion 624, the top located at the outermost peripheral end is constituted by an arc-shaped surface 626 formed in an arc shape in the longitudinal sectional view.

The curvature radius of the arc-shaped surface 626 constituting the top of the upper bead molding convex portion 624 is set larger than the curvature radius of the arc-shaped surface 615 constituting the top of the lower bead molding convex portion 612, and The bead forming convex portion 624 is located radially outward of the lower bead forming convex portion 612. Therefore, the width (longitudinal dimension) of the upper bead 45 is larger than the width (longitudinal dimension) of the lower bead 46, and is formed so as to project radially outward of the skirt portion 42 more than the lower bead 46. .
In addition, the first cutting edge portion 623 is located radially inward from a tangent of the arc-shaped surface 626 of the upper bead forming convex portion 624 and the arc-shaped surface 615 of the lower bead forming convex portion 612. Therefore, a region surrounded by the second inclined surface 614 of the lower bead plate 61, the end surface 621 of the upper bead plate 62, the outer peripheral surface 622, and the first inclined surface 625 forms a relief groove S1.
In addition, the code | symbol 63 has shown the intermediate | middle plate contact | abutted to the upper bead plate 62, and other several plates (not shown) are laminated | stacked one by one on this intermediate | middle plate 63. As shown in FIG.

(Configuration of the first area of the outer tool)
As shown in FIGS. 6-8, the outer tool 7 forms the outer surface of the lower bead 46 in the first region 7A, which is a portion for forming the beads 45, 46 in the cylindrical portion 42A. 71, an upper bead upper edge plate 73 for molding the outer surface of the upper bead 45, and a bent portion formed plate 72 located between the lower bead lower edge plate 71 and the upper bead upper edge plate 73.
The lower bead lower edge plate 71 has a lower bead formed portion 713 formed by the outer peripheral surface 711 and an end surface 712 in contact with the bent portion formed plate 72. The lower bead formed portion 713 is a circle in a longitudinal sectional view It is formed in an arc shape and located slightly above the lower bead molding convex portion 612.

The upper bead upper edge plate 73 is disposed to face the middle plate 63 of the inner tool 6. An upper bead molding portion 733 formed by the outer peripheral surface 731 and the end surface 732 of the upper bead upper edge plate 73 is formed in an arc shape in a longitudinal cross sectional view and is positioned below the upper bead molding convex portion 624. There is.
The bending portion forming plate 72 is disposed to face the lower bead forming convex portion 612 of the lower bead plate 61 and the upper bead forming convex portion 624 of the upper bead plate 62, and protrudes outward in the radial direction on the outer peripheral surface 721. A bent portion forming convex portion 722 is formed. As shown in FIGS. 6 to 8, the bent portion forming convex portion 722 is formed in a triangular shape in a longitudinal sectional view, and the top portion is formed by an arc-shaped surface 723. Further, the bent portion forming convex portion 722 is formed below the lower bead forming convex portion 612 of the inner tool 6 and above the upper bead forming convex portion 624.

As shown in FIG. 5, when the inner tool 6 is fitted to the cap member 4A and the first region 7A of the outer tool 7 is rolled, the inner surface of the cylindrical portion 42A is the inner tool 6 as shown in FIG. The outer surface of the cylindrical portion 42A is pressed by the lower bead forming portion 713, the bent portion forming convex portion 722, and the upper bead forming convex portion 733 by the lower bead forming convex portion 612 and the upper bead forming convex portion 624. The lower portion of the portion pressed by the upper bead molding convex portion 624 is pressed by the upper bead molding portion 733, and the upper portion of the portion pressed by the lower bead molding convex portion 612 is the lower bead molded portion 713 is pressed. Thereby, the upper bead 45, the lower bead 46, and the bending portion 47 are formed in the cylindrical portion 42A.
Thus, the cylindrical portion 42A is formed into the cylindrical portion 42B having the upper bead 45, the lower bead 46 and the bent portion 47, and the cap material 4B is formed.

[Slit molding process]
The slit forming process is performed by the second region 7 B of the inner tool 6 and the outer tool 7.
(Configuration of the second area of the outer tool)
The second area 7B of the outer tool 7 has the lower bead lower edge plate 71 and the upper bead upper edge plate 73 as shown in FIG. 9 in the same manner as the first area 7A shown in FIGS. 6 and 7. However, there is a slit plate for forming a plurality of slits 48 in place of the plate formed between the lower bead lower edge plate 71 and the upper bead upper edge plate 73 in the first area 7A. The difference is 74.

On the outer peripheral surface 741 of the slit plate 74, as shown in FIG. 9, protruding pieces 742 protruding outward in the radial direction are formed at intervals in the circumferential direction. The projecting pieces 742 are disposed at an interval corresponding to the width of the bridge 49 in the slit plate 74.
The projecting piece 742 is formed in a thin, substantially triangular wedge shape in a longitudinal sectional view, and a first surface 743 linearly extending outward in the radial direction from the outer peripheral surface 741 and a straight line upward from the tip of the first surface 743 , And a first inclined surface 746 inclined upward and inward in the radial direction from the end of the second surface 744 to the end surface 748 of the slit plate 74. Of these, the ridge line between the first surface 743 and the second surface 744 constitutes a second cutting edge 745. Further, the corner portion 747 formed by the second surface 744 and the first inclined surface 746 is formed in an arc shape in the longitudinal sectional view.
The first surface 743 of the second cutting edge 745 is disposed with a slight clearance between the first cutting surface 623 of the inner tool 6 and the end surface 621 of the first cutting edge 623. When brought into contact with the second region 7B, the second cutting edge 745 bites into the clearance groove S1 radially inward of the inner tool 6 than the first cutting edge 623. There is.

  As shown in FIG. 5, when the inner tool 6 is fitted to the cap member 4B and the second region 7B of the outer tool 7 is rolled, the bent portion 47 of the cylindrical portion 42B has an arc-shaped corner of the projecting piece 742 The bent portion 47 is broken by the portion 747 and pressed against the first cutting edge portion 623, and the first cutting edge portion 623 and the second cutting edge portion 745 positioned at the tip of the projecting piece 742 A slit 48 is formed at 47.

Although not shown, the grooves 14 near the top surface 41, the knurled recess 11, the opening 12 and the hooks 13 are formed on the plurality of disc-shaped plates constituting the inner tool 6 described above. A plate (not shown) is included. The first region 7A of the outer tool 7 includes a plate (not shown) for forming the groove portion 14. The second region 7B includes the knurled recess 11, the opening 12 and the hook portion 13 in the cylindrical portion 42B. A plate (not shown) to be molded is included. Therefore, although the detailed description is omitted, the groove portion 14 is formed in the cylindrical portion 42A in the bead forming step, and the knurled recess 11, the opening 12 and the hook portion 13 are formed in the cylindrical portion 42B in the slit forming step.
And the pill fur proof cap 3 manufactured by the said manufacturing process is given a capping process in the state which covered the opening part of the bottle can, and the bottle can with a cap (not shown) is formed.

In the method of manufacturing the pill fur proof cap 3 of the present embodiment, since the slit forming step is performed after the bead forming step, the tensile force acting in the vicinity of the position where the slit 48 is formed can be reduced. Therefore, bridge breakage at the time of manufacture of the pill fur proof cap 3 can be suppressed.
Further, since the plurality of bridges 49 of the pill fur proof cap 3 are bent radially inward of the skirt portion 42 with respect to the upper bead 45 and the lower bead 46, the pil fur proof cap 3 is attached to the container opening At the same time, the bending portion 47 is extended, and the generation of the tensile stress and the compressive stress can be reduced accordingly, and the bridge breakage of the pill fur proof cap 3 can be suppressed.
Furthermore, in the manufacturing apparatus 8, the bead forming and the slit forming are separately performed while rolling the cap material 41A fitted with the inner tool 6 from the first area 7A to the second area 7B of the outer tool sequentially. It is possible to efficiently manufacture the pill-fur proof cap 3 which is resistant to breakage and breakage.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the pill fur proof cap attached to the cap can and the bottle can has been described, but the container of the cap container in the present invention is not limited to the bottle can In addition to bottle cans, containers such as glass bottles and PET bottles are also included.

Here, in order to verify the effect of the present invention, it is possible to form the upper bead 45, the lower bead 46, the plurality of slits 48 and the plurality of bridges 49 at one time on the cylindrical portion 42A of the cap member 4A having an outer diameter of 38 mm. After forming the upper bead 45, the lower bead 46 and the bent portion 47 in the forming step (collective step) and the cylindrical portion 42A of the cap member 4A by the bead forming step, a plurality of them are formed in the cylindrical portion 42B of the cap member 4B. The following experiment was conducted to compare with the manufacturing process (the present manufacturing process) of the present invention in which the slits 48 and the plurality of bridges 49 are formed by the slit forming process.
In each of the batch process and the main production process, 20 samples each having a plurality of slits 48 are formed, (A) opening torque, (B) opening angle, (C) tensile limit condition The number of occurrences of bridge breakage and the number of occurrence of bridge breakage under (D) compression limit conditions were evaluated.

The definition and evaluation method of each evaluation item mentioned above are as follows.
(A) Opening torque: When the pill fur proof cap 3 attached to the bottle can is opened, the value of the torque at which one of the plurality of bridges 49 first breaks is taken as the opening torque. The value of the opening torque is desirably 160 [N / cm] or less.

  (B) Opening angle: The opening angle of the pill fur proof cap 3 until all the bridges 49 are broken when the pill fur proof cap 3 attached to the bottle can is opened is Do. The value of the opening angle is desirably 300 degrees or less.

(C) Number of bridge breakages occurring under tensile limit conditions: Set under conditions where strong tensile stress is generated in the bridge at the time of capping, and the number of bridge breakages is counted. The condition setting of the limit test at this time is as follows.
(1) Axial load when drawing at the end edge during capping: 970 [N] (2) Hem-winding roll torque when hemming is performed to the lower portion 44 of the cylinder: 3.8 [Nm]
(3) Distance between the winding roll and the die for drawing at the edge: 14.9 [mm]
(4) Internal pressure: 2.2 [kgf / cm ² ]

(D) Number of bridge breakages occurring under compression limit conditions: The number of bridge breakages is counted under the condition that strong compressive stress is generated in the bridge at the time of capping. The condition setting of the limit test at this time is as follows.
(1) Axial load at the time of drawing in the lower portion 44 of the cylinder at the time of capping: First load is 950 [N], second load is 850 [N]
(2) Torque of screw roll when performing internal thread processing on the internal thread formation portion of the cylinder upper portion 43: The first time is 3.8 [Nm] and the second time is 3.0 [Nm]
(3) Torque of the hemming roll when hemming is performed on the lower portion 44 of the cylinder: 3.8 [Nm] for both the first time and the second time
(4) Distance between the screw roll and the die for drawing the end edge: 2.6 [mm] for both the first and second times
(5) The distance between the bottom roll and the die for drawing at the edge: 15.9 [mm] for the first time, 15.6 [mm] for the second time

  The experimental results are as shown in Table 1 below.

As shown in Table 1, (A) the opening torque is 120 [N / cm] in the case of the batch process, 115 [N / cm] in the case of the present manufacturing process, and both are 160 [N / cm]. It was below.
(B) The opening angle was 200 ° in the case of the batch process and 220 ° in the case of the main production process, and both were 300 ° or less. As described above, the reason why the opening angle is slightly larger than the pill-ferr proof cap manufactured by the batch process is that the bridge 49 is bent inward in the radial direction of the skirt portion 42. It is considered that the cause is that the bent portion of the is elongated and changes substantially linearly. However, even in the case of molding according to the present manufacturing process, since the opening torque and the opening angle are within the desired range, it can be used in substantially the same manner as the pilfer proof cap manufactured in the collective process. It is recognized that the pill fur proof cap 3 manufactured by the manufacturing process is not different from the pill fur proof cap manufactured by the batch process.

Further, with respect to the number of bridge breakage occurrence under (C) tensile limit conditions, bridge breakage occurred in two pilfer proof caps out of the 20 pilfer proof caps in which the slits 48 were formed in the collective step. On the other hand, in the twenty pill fur proof caps 3 manufactured according to the present manufacturing process, bridge breakage did not occur in all.
Furthermore, in the (D) number of occurrences of bridge breakage under the compression limit condition, bridge breakage occurred in three pill-ferr proof caps out of the twenty pill-ferr proof caps in which the slits 48 were formed by the collective process. On the other hand, in the twenty pill fur proof caps 3 manufactured according to the present manufacturing process, bridge breakage did not occur in all.
Therefore, it has been verified that the pill fur proof cap 3 manufactured by the present manufacturing process can suppress the occurrence of bridge breakage.

Reference Signs List 3 pill fur proof cap 4 cap body 4A cap material 4B cap material 5 liner 6 inner tool 7 outer tool 7A first area 7B second area 8 manufacturing device 41 top surface portion 42 skirt portion 42A cylindrical portion 42B cylindrical portion 43 cylindrical portion 44 cylinder Lower part 45 Upper bead 46 Lower bead 47 Bending part 48 Slit 49 Bridge 612 Lower bead forming convex part 623 First cutting edge part 624 Upper bead forming convex part 713 Lower bead forming part 722 Bending part forming convex part 733 Upper bead forming part 745 2 cutting blade

Claims (3)

In the skirt portion of the cap main body provided with a top surface portion and a skirt portion substantially depending from the periphery of the top surface portion, an upper bead projecting radially outward of the skirt portion, and a lower side of the upper bead A lower bead protruding radially outward of the skirt portion, and a plurality of slits and a plurality of bridges alternately arranged in the circumferential direction of the skirt portion between the upper bead and the lower bead are formed. Method of producing a pill-ferr proof cap,
A cap material forming step of forming a cap material including the top surface portion and a cylindrical portion to be the skirt portion;
In the cylindrical portion of the cap member, the upper bead, the lower bead, and a bent portion which is bent inward in the radial direction of the cylindrical portion between the upper bead and the lower bead, the circumference of the cylindrical portion Forming a bead along a direction;
And a slit forming step of forming the plurality of slits and the plurality of bridges in the bent portion after the bead forming step. In the skirt portion of the cap main body provided with a top surface portion and a skirt portion substantially depending from the periphery of the top surface portion, an upper bead projecting radially outward of the skirt portion, and a lower side of the upper bead A lower bead protruding radially outward of the skirt portion, and a plurality of slits and a plurality of bridges alternately arranged in the circumferential direction of the skirt portion between the upper bead and the lower bead are formed. An apparatus for producing a pill fur proof cap,
An inner tool fitted with a cap material including the top surface portion and a cylindrical portion to be the skirt portion; and the cap material pressed by the inner tool being rolled together with the inner tool; And an outer tool for sandwiching and molding the cap material therebetween;
The inner tool includes a lower bead molding convex portion for molding the inner surface of the lower bead, an upper bead molding convex portion for molding the inner surface of the upper bead, the upper bead molding convex portion and the lower bead molding In order to form the plurality of slits, which are disposed radially inward from the upper bead molding convex portion and the lower bead molding convex portion in the relief groove portion having a concave shape between the convex portion and the relief groove portion. A first cutting edge portion of
The outer tool has a first area for rolling the cap material together with the inner tool, and a second area for rolling the cap material rolled on the first area.
The first region deforms the cylindrical portion with the upper bead molding convex portion to mold the outer surface of the upper bead, and the cylindrical portion between the upper bead molding portion and the lower bead molding convex portion Bending part forming convex part which is located between the lower bead and the upper bead and which forms the outer surface of a bending part which is located between the lower bead and the upper bead and which deforms to form the outer surface of the lower bead. Have a department,
The second region is characterized by having a plurality of second cutting edge portions for cutting the bending portion formed in the first region with the first cutting edge portion to form the slit. Production equipment for pill fur proof caps. In the skirt portion of the cap main body provided with a top surface portion and a skirt portion substantially depending from the periphery of the top surface portion, an upper bead projecting radially outward of the skirt portion, and a lower side of the upper bead A lower bead protruding radially outward of the skirt portion, and a plurality of slits and a plurality of bridges alternately arranged in the circumferential direction of the skirt portion between the upper bead and the lower bead are formed. Pill fur proof cap,
A pilfer-proof cap, wherein the plurality of bridges are bent inward in the radial direction of the skirt portion with respect to the upper bead and the lower bead in a longitudinal sectional view of the skirt portion.

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