JP2000072164A - Method and apparatus for forming washing hole or slit for synthetic resin cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently form washing holes or a slit without requiring a wide space by a method wherein the washing holes or the slit are formed at the wall of a skirt of a cap main body with the cap main body held from inside and with its skirt wall pressed against a cutter, revolving on its own axis while revolving on a circular orbit. SOLUTION: A cap C brought through a conveyance passage is put and held on a head part 25 of a spindle 22 when being guided into a circling passage, and as it reaches a knurled groove 41a of a guide member 41 after revolving along the circling passage while turning on its axis, a knurled groove 31 of the cap C is caused to mesh with the knurled groove 41a and revolved while forcibly turned on its axis. In this process, washing holes 8,... and a slit are formed simultaneously and respectively at the upper part of a skirt wall 3 and a position between breakable bridges at the lower part thereof with cutters 42 and 43 provided integrally at the guide member 41. Therefore, the cap C is held stably with a pressing force of the spindle 22 and cutting is made precisely with the cutters 42 and 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a method for forming a cleaning hole or a slit in a synthetic resin cap and an apparatus for forming the same.

[0002]

2. Description of the Related Art At the time of filling a fruit juice beverage or the like, a content liquid overflows from a bottle mouth, and a liquid containing sugar adheres to an outer peripheral surface of the bottle mouth.
To prevent this, such as increasing the opening torque of the cap, capping after filling to prevent this, then wash water or hot water from the top of the cap by showering,
A cap has been proposed which is guided to the outer peripheral surface of the bottle through a cleaning hole of the cap to wash off a liquid containing sugar attached to the bottle.

For example, Japanese Patent Application Laid-Open No. 7-41023 proposes a pill fur proof cap made of a plastic molded product. Also, JP-A-6-34510
Japanese Patent Application Laid-Open No. 6-26139 proposes a method of manufacturing a synthetic resin pill fur proof cap having a plurality of slits formed at intervals in a circumferential direction mechanically by a rotary blade after the cap is formed.

[0004]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. 7-41023
In the conventional example shown in the publication, smooth capping properties and sufficient retaining force can be obtained by the continuous bellows-like locking part, but if the showering is performed for the purpose of cleaning the bottle mouth after capping, the lower part of the cap body can be broken. Cleaning water that has entered from the area may accumulate in the bellows locking portion and become contaminated, resulting in unsanitary food hygiene.

Further, when a cleaning hole c is formed by post-processing using a cutter b or the like above a cap a (see FIG. 15) made of a general synthetic resin, burrs d are likely to be generated. When used in combination with e, the inner plug e may be lifted by the burr d before the bridge is broken by a slight mischievous opening operation after the hot pack. At times, there is a concern that a problem may occur that the airtightness cannot be confirmed from the outside even though the airtightness is impaired.

On the other hand, a conventional example disclosed in Japanese Patent Application Laid-Open No. 6-345106 discloses a T-pillar-proof cap.
It only describes a manufacturing technique of forming a slit for forming a break area for separating the E band in the lower portion of the cap by post-processing, and a cleaning hole or slit for washing away substances attached to the bottle during filling. There is a demand for the development of a manufacturing technique for separately and efficiently forming.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a method and an apparatus capable of forming an inflow hole or a slit of a cleaning liquid capable of washing away an attached matter of an overflowing content liquid at the time of filling after capping without requiring a large space.

[0008]

According to the present invention, means for solving the above-mentioned problems are constituted as follows.

According to the first aspect of the present invention, the cap body is supported from the inside and revolves on a predetermined circular orbit while rotating, and the skirt wall is pressed against the cutter to form a cleaning hole in the skirt wall. Alternatively, a slit is formed.

According to the second aspect of the present invention, the cap body is supported from the inside and revolves around a predetermined circular orbit while rotating, and the cap body is subjected to a rotational forcing force from the outside, thereby forming the skirt wall. Press it against the cutter,
A cleaning hole or a slit is formed in the skirt wall.

According to a third aspect of the present invention, a cleaning hole or a slit is formed by heating the cutter according to the first or second aspect.

According to the fourth aspect of the present invention, a spindle for supporting the cap body from the inside and revolving while rotating on a predetermined circular orbit, and a cleaning hole in contact with the rotating skirt wall of the cap body. Alternatively, cutting means for forming a slit is provided.

According to the fifth aspect of the present invention, the spindle for supporting the cap body from the inside and revolving while rotating on a predetermined circular orbit, and slidingly contacting the outer peripheral surface of the cap body, forcibly displacing the cap body. And a cutting means for forming a cleaning hole or a slit in contact with the rotating skirt wall of the cap body.

According to a sixth aspect of the present invention, the cutting means according to the fourth or fifth aspect has a heating device.

By pressing the skirt wall of the cap being forcibly rotated against the cutting means, a cleaning hole or slit can be easily formed in the skirt wall. By heating the cutting means, the formation of the cleaning holes or slits is further facilitated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for forming a cleaning hole or a slit in a synthetic resin cap of the present invention will be described below in detail with reference to the drawings.

1 to 6 show a synthetic resin cap (pill fur proof cap) C formed by the injection molding method of the present invention. In these figures, reference numeral 1 denotes a cap body, 2 denotes a top plate, and 3 denotes a top plate. The top plate 2
The skirt wall 31 hangs down from the outer periphery of the skirt wall, 31 is a knurl groove formed on the outer periphery of the skirt wall, 4 is a female screw groove carved on the inner circumference of the skirt wall 3, and 41 intersects the female screw groove 4. 5 is a breakable bridge formed in the lower inner surface of the skirt wall 3, and 6 is a TE connected to the lower portion of the skirt wall 3 via the bridge 5.
This is a band (tamper evidence band), and a plurality of the above-described bridges 5 are provided at predetermined intervals, and a gap is formed therebetween.

Reference numeral 7 denotes a continuous bellows-shaped locking member formed on the inner surface of the TE band 6, which is bent obliquely inward and upward from the lower end of the TE band 6, and is formed in a bellows shape having a continuous constriction. You. Reference numeral 8 denotes a slit-shaped washing hole (or vent hole) formed in the upper part of the skirt wall 3 at appropriate intervals in the circumferential direction. 9 denotes a continuous bellows-like locking member 7 at the lower end of the TE band 6. Is a small hole formed in the bent portion for discharging the cleaning liquid.

On the other hand, reference numeral 11 denotes an inner plug closely fitted to the bottle opening 10, and a top plate 111 whose outer peripheral edge is in contact with the upper end of the bottle opening 10,
It consists of a middle foot 112 which hangs downward from the peripheral edge of the top plate 111 and is in close contact with the inner peripheral surface of the bottle opening 10. Reference numeral 12 denotes a male screw formed on the outer periphery of the bottle 10 for screwing the female screw groove 4 of the cap body 1, 121 denotes a vertical groove formed so as to cross the male screw 12, and 13 denotes a TE band 6. This is a bead for locking the continuous bellows-shaped locking member 7 formed on the inner surface.

In the cap C formed as described above,
Since the continuous bellows-shaped locking member 7 has flexibility, the bridge 5 can easily pass over the bead 13 of the bottle opening 10 at the time of closure, and can be restored and locked at the lower portion of the bead 13 after closure.
Is prevented, the mounting property is good, and when the plug is opened, the continuous bellows-shaped locking member 7 having a constricted upper shape is securely locked to the bead 13 to break the bridge 5 without fail. The bridge 5 can be
The danger that the airtightness is lost before the burnout expires is completely prevented. The small holes 9 formed in the continuous bent portion 61 of the TE band 6 are preferably provided at predetermined intervals in the circumferential direction so as to secure sufficient retaining strength of the TE band 6. In the example, four are formed.

On the other hand, the filling liquid 15
The inner plug 11 may be closed in a state in which is adhered (see FIG. 5). Even in such a case, when the cleaning liquid is sprayed on the cap during the cleaning process, as shown in FIG. ,... And the gap between the bridges 5,.
5 is washed away by the washing liquid, flows down from the vertical groove 41, and is discharged to the outside through the small hole 9 in the lower part. Therefore, in any cap, the inside of the cap is uniformly cleaned, the generation of mold is prevented, and the appearance is also clean.

Needless to say, the above-mentioned cleaning holes 8,... And discharge small holes 9,. Also, when the upper cleaning holes 8,... Are not provided, a sufficient cleaning effect can be obtained by introducing the cleaning liquid into the gaps between the bridges 5,. The cleaning effect can be further improved by providing.

FIGS. 7 and 8 show cross sections of different embodiments of the synthetic resin cap. In these figures, reference numeral 14 denotes a thin portion formed on the upper portion of the skirt wall 3, and the thin portion 14 is a cap body. It can be formed in advance in one molding step, and the thickness is preferably about 0.1 to 0.5 mm, more preferably about 0.3 mm. With such a thickness, even if the post-processing of the cleaning hole 8 is performed by the cutter 42 after the molding of the cap main body, a large burr as shown by d in FIG. 15 does not occur. The cleaning holes 8 can be easily formed by means or electric discharge machining means.

On the other hand, the continuous bellows-shaped locking member 7, which is constricted at the lower part of the skirt wall 3 via the bridge 5, can easily pass over the bead 13 with a low passage resistance when the plug is closed, and the bottle 10 It can be stably hooked from below on the entire circumference of the bead 13, and can be reliably hooked on the bead 13 when the plug is opened, so that the bridges 5,.

At the time of opening, since no large burr is formed in the washing hole 8, the inner plug 11 is not carelessly lifted, and the airtightness is lost due to mischief such as a short turn. There is no such a problem, and the airtightness of the inner plug 11 is maintained even when the bridges 5 are broken.

After the content liquid is filled, even if the content liquid overflows into the cap C, the cleaning liquid is introduced into the inside through the cleaning holes 8,... And the slits 51 between the bridges 5, 5. The inside is washed and discharged from the discharge holes 9 to prevent the generation of mold.

FIGS. 9 to 14 show an apparatus for carrying out the method of forming the synthetic resin cap C according to the present invention. A small gear 23 fixed at one end of the spindle 22 meshes with a large-diameter fixed gear 24, and a head 25 formed at the other end of the spindle 22 has Three balls 2 abutting on the inner surface of the top plate 2 of the cap body 1
Are fitted in the guide holes 27 to form springs 28,.
As shown in FIG. 9, a sleeve 29 is rotatably supported on the outer periphery of the tip of the head 25.

A rod 30 for projecting a cap is freely rotatably fitted into the shaft center of the spindle 22 (see FIG. 10). A cam follower 31 provided at the base of the rod 30 has a cylindrical shape. The cap C is slidably guided by a cam groove 33 (see FIG. 13) provided on the outer periphery of the support 32, and the cap C is projected outward by the rod 30 at the cap projection position 444. A discharge blow nozzle 445 is provided at the protruding position 444 (see FIG. 14), so that air is blown out in synchronization with the protruding operation of the rod 30 so that the cap C can be reliably protruded. .

The six spindles 22,... Are rotatably supported by a hub 34 at equal intervals (see FIG. 10), and a pulley (or a pulley) fixed to one end of a support shaft 35 of the hub 34 is provided. Although not shown, a driving force source is operatively connected to the sprocket (not shown) through a wrapping transmission mechanism using a belt or a chain. Are revolving around the fixed gear 24 while rotating. Reference numeral 37 denotes a bearing that rotatably supports the spindle 22 on the hub 34, and reference numeral 38 denotes a bearing that rotatably supports the support shaft 35 of the hub 34, and is supported by the support 32.

The cap C is supported from the inside by the head portion 25 of the spindle 22, and the skirt wall 3 is pressed against the knurl groove 41a of the guide member 41 to engage with the knurl groove 6 formed in the cap C in advance. The cutters 42 and 43 provided integrally with the guide member 41 while forcibly rotating the cap C by the
Can be formed in the upper portion of the skirt wall 3 (see FIG. 12), and the slits 71 can be formed simultaneously between the breakable bridges 7 formed in the lower portion. Note that the above-described cleaning hole 8 may have a slit shape.

As described above, the cap C is attached to the spindle 2
When the head 2 is forcibly rotated by being sandwiched between the head 25 and the knurled groove 41a, the sleeve 29 is freely rotatably provided on the outer periphery of the tip of the head 25.
Can absorb the peripheral speed difference from the large diameter portion, eliminate the slip between the cap C and the head portion 25, and stably hold the cap C by the pressing force of the spindle 22 against the knurled groove 41a. The cutting operation can be performed with high accuracy by both cutters 42 and 43.

The transport route 440 of the cap C is shown in FIG.
3, see FIG. 14), the cross-section of which is substantially U-shaped, and from a carry-in path 441 formed diagonally downward, to a discharge path 443 diagonally downward through a swirling circuit 442 formed around the fixed gear 24. It is formed so as to be continuous, and its loading path 441
Is formed at an inclination angle such that the cap C is fitted obliquely from above to the head portion 25 of the spindle 22 (see FIG. 10).
It is formed so that the cap C protruded at 44 can be discharged obliquely downward as it is. Since the transport route 440 is formed in such an annular shape, the entire apparatus can be made compact.

The above-described guide member 41 and cutters 42, 4
3 (see FIG. 11) is formed in a fan shape,
45 and heaters 46, 47 together with both brackets 48,
It is clamped and integrated by fastening a bolt 50 between 49 and fixed at a predetermined position inside the swirl circuit 442. The cutter 42 for forming the cleaning hole 8 (see FIGS. 7 and 12) has eight blades 421,..., And the cutter 43 for forming the slit 51 has one blade 431. Since both the cutters 42 and 43 are heated by the heaters 46 and 47, good cutting properties can be obtained and the generation of burrs can be suppressed in combination with the formation of the thin portion 14.
In order to form the above slits 51,..., The cap C is preliminarily formed so that the portion to be the bridge 5 projects inward, and the portion is cut from the outside with a single-blade cutter 43. Can be formed between the bridges 5 and 5, or the slits can be formed by the method disclosed in the above-mentioned JP-A-6-345106.

The step of forming the cap C will be described. First, the cap C loaded from the loading path 441 is fitted and supported by the head portion 25 of the spindle 22 at the time when the cap C is introduced into the rotation circuit 442. When the knurl groove 41a of the guide member 41 reaches the knurl groove 41a, the knurl groove 31 of the cap C engages with the knurl groove 41a and revolves while forcibly rotating. During this time, the cleaning holes 8,... And the slits 51,... Are simultaneously formed by the two cutters 42, 43, and the cap C is protruded toward the discharge path 443 by the rod 30 at the cap protruding position 444. The small holes (or slits) 9 for draining water are formed in advance in the molding stage.

During the cutting operation by the cutters 42 and 43, the cap C is sandwiched between the head portion 25 of the spindle 22 and the knurled groove 41a. Since the peripheral speed difference on the surface is absorbed, the support of the cap C is stable, and two cuttings can be performed efficiently.

[0036]

According to the first to fourth aspects of the present invention, the cap is supported from the inside and revolves while revolving on a predetermined circular orbit, and a forced force component is applied to the cap from the outside. The skirt wall is pressed against the cutter to form a cleaning hole or slit in the skirt wall, so that the cleaning hole or slit can be efficiently formed without requiring a large space.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a closed state of an embodiment of a synthetic resin cap of the present invention.

FIG. 2 is a longitudinal sectional view of the cap.

FIG. 3 is a bottom view of the cap.

FIG. 4 is an enlarged sectional view of a lower portion of the cap.

FIG. 5 is an assembled perspective view of the cap.

FIG. 6 is a cross-sectional view showing a flow of a cleaning liquid during the cleaning.

FIG. 7 is a partial cross-sectional view showing a different embodiment of the same cap in a closed state.

FIG. 8 is an enlarged sectional view of a main part of the cap.

FIG. 9 is a cross-sectional plan view of a main part of a cutting step in the method for manufacturing the cap.

FIG. 10 is an explanatory diagram showing a correspondence relationship between a cap and a spindle in each step of loading and unloading the cap.

FIG. 11 is an exploded perspective view of the guide member, the cutter, and the like.

FIG. 12 is an explanatory view of a step of forming the cleaning hole.

FIG. 13 is an explanatory perspective view showing a main layout of the device.

FIG. 14 is a perspective view showing a transport route of the apparatus.

FIG. 15 is a cross-sectional view of a cap showing an example of a case in which burrs are generated by a conventional cleaning hole processing.

[Explanation of symbols]

C: cap, 1: cap body, 3: skirt wall, 8
... holes or slits for cleaning, 22 ... spindles, 41 ...
Guide member, 41a: Knurl groove, 42, 43: Cutter.

Claims (6)

[Claims] 1. A method in which a cap body is supported from the inside and revolves around a predetermined circular orbit while rotating, and a skirt wall is pressed against a cutter to form a cleaning hole or a slit in the skirt wall. A method for forming a cleaning hole or a slit in a synthetic resin cap. 2. The cap body is supported from the inside and revolves while revolving on a predetermined circular orbit, and a rotational force is applied to the cap body from the outside, and the skirt wall is pressed against a cutter, and A method for forming a cleaning hole or slit in a synthetic resin cap, comprising forming a cleaning hole or slit in a skirt wall. 3. A cleaning hole or a slit is formed by heating the cutter.
3. The method for forming a cleaning hole or a slit of a synthetic resin cap according to item 1. 4. A spindle for supporting a cap body from the inside and revolving while rotating on a predetermined circular orbit, and for forming a cleaning hole or a slit in contact with a skirt wall of the rotating cap body. An apparatus for forming a cleaning hole or a slit in a synthetic resin cap, comprising: a cutting means. 5. A spindle which supports the cap body from the inside and revolves while revolving on a predetermined circular orbit, and a knurl groove for slidingly contacting the outer peripheral surface of the cap body and forcibly rotating the cap body. Or a cutting member for forming a cleaning hole or a slit in contact with the rotating skirt wall of the cap body, the cleaning hole of the synthetic resin cap or Slit forming device. 6. The apparatus according to claim 4, wherein said cutting means has a heating device.