JP7204381B2 - cap separator - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies. Delivered to ADVEL Co., Ltd. on July 19, 2018.

The present invention relates to a cap separating device for removing and separating a cap attached to a plastic container such as an empty or used beverage PET bottle from the plastic container.

Polyethylene terephthalate, which has a low burning calorie and does not contain chlorine, which is a cause of dioxin generation, is used in plastic beverage containers. A cap is attached to the PET bottle, and the cap is removed from the mouth of the PET bottle when the drink is to be drunk. Both PET bottles and caps are made of plastic and are subject to recycling. However, caps are made of polypropylene and have a different material from PET bottles, so they must be collected separately from PET bottles. Therefore, the cap removed from the PET bottle should be discarded separately from the PET bottle, but there are many cases where an empty PET bottle is discarded with the cap attached again. In addition, when the cap is removed from the mouth of the PET bottle, the plastic cap ring remains at the base of the mouth, but this cap ring is also made of polypropylene and must be separated.

However, manual removal of the cap from an empty or used PET bottle attached with the cap is inefficient. In addition, if the cap ring remaining on an empty or used PET bottle is removed manually, the work efficiency is even worse. . This cap separating device passes a PET bottle with a cap between a pair of crushing rollers and presses and breaks the cap and cap ring while crushing the PET bottle. It is a device for separating the cap and the cap ring from the PET bottle.

Japanese Patent Application Laid-Open No. 2002-292630

However, in the cap separating device described in Patent Document 1, the cap and the cap ring are crushed and broken by a pair of crushing rollers to separate the cap and the like from the PET bottle. The cap and the cap ring cannot be sufficiently crushed or broken by just using the plastic bottle, and the cap and the cap ring are often discharged with the cap and the cap ring attached to the mouth portion of the PET bottle so as not to be easily separated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cap separating device capable of effectively removing a cap and a cap ring from a PET bottle.

To this end, the cap separating device of the present invention provides for separating a cap, e.g. A cap separating apparatus for separating from a manufacturing container, comprising: a first crushing rotary drum; and said first crushing arranged to mesh with said first crushing rotary drum at a meshing position. a second rotating crushing drum having the same diameter as the rotating drum for the container; a drive motor for rotating at a rotational speed in opposite directions, and a large number of first ridge teeth extending in the longitudinal direction are provided on the outer circumference of the first crushing rotary drum at equal intervals in the circumferential direction. A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided at equal intervals in the circumferential direction on the outer periphery of the second crushing rotary drum. , the first space between the adjacent first teeth of the ridge corresponds to the cross-sectional shape of the second teeth of the ridge, and the second space between the second teeth of the adjacent ridge corresponds to the Corresponding to the cross-sectional shape of the first ridge tooth, at the center of the meshing position, the first ridge tooth is generally contained in the second space between the second ridge teeth. and said second ridge tooth is wholly contained in said first space between said first ridge teeth. The first ridge tooth and the second ridge tooth mesh at the meshing position. A plastic container with a cap is crushed and deformed into a corrugated shape as it passes through the mating position and is well compressed over a long range. Therefore, the connection such as the threaded portion between the cap and cap ring and the mouth portion of the plastic container is broken or crushed, and the cap and cap ring come off the plastic container. In particular, at the center of the meshing position, the first ridge tooth and the second ridge tooth mesh with each other with, for example, a slight clearance, so that the degree of crushing is sufficiently large. The meshing position is a position where the first ridge tooth enters the second space or where the second ridge tooth enters the first space.

Also, the cap separating device of the present invention separates, for example, a plastic cap attached to an empty or used plastic container, which can be easily crushed or flattened, from the plastic container. a first rotary crushing drum for and same as said first rotary crushing drum arranged to mesh with said first rotary crushing drum in a meshing position a second rotating crushing drum of diameter and rotating said first rotating crushing drum and said second rotating crushing drum at the same rotational speed and in opposite directions so that the plastic container is wound into said meshing position; and a drive motor for rotating the first crushing rotary drum, and a large number of first ridge teeth extending in the longitudinal direction are provided at equal intervals in the circumferential direction on the outer periphery of the first crushing rotary drum. A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided on the outer circumference of the rotating drum for crushing at regular intervals in the circumferential direction. When the half length of the interval between the rotation center of the first crushing rotary drum and the rotation center of the second crushing rotary drum is defined as P, the first crushing rotary drum Imaginary circles centered on the center of rotation and the center of rotation of the second crushing rotary drum and having a radius of P pass approximately midway between the tooth depths of the first ridge tooth and the second ridge tooth. It can be configured as being formed to In this case, too, at the center of the meshing position, the first ridge tooth and the second ridge tooth are meshed with, for example, a slight clearance, so that the crushing force or degree of crushing is sufficient over a long range. Become.

Furthermore, the cap separating device of the present invention separates, for example, a plastic cap attached to an empty or used plastic container, which can be easily crushed or flattened, from this plastic container. a first rotary crushing drum for and same as said first rotary crushing drum arranged to mesh with said first rotary crushing drum in a meshing position a second rotating crushing drum of diameter and rotating said first rotating crushing drum and said second rotating crushing drum at the same rotational speed and in opposite directions so that the plastic container is wound into said meshing position; and a drive motor for rotating the first crushing rotary drum, and a large number of first ridge teeth extending in the longitudinal direction are provided at equal intervals in the circumferential direction on the outer periphery of the first crushing rotary drum. A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided on the outer periphery of the rotating drum for crushing at regular intervals in the circumferential direction. position, the addendum circle of the first ridge tooth is in contact with the dedendum circle of the second ridge tooth, and the addendum circle of the second ridge tooth is in contact with the first ridge tooth. It can also be configured as being in contact with the root circle of the tooth. In this case, too, at the center of the meshing position, the first ridge tooth and the second ridge tooth are meshed with, for example, a slight clearance, so that the crushing force or degree of crushing is sufficient over a long range. Become.

In order not to damage the plastic container excessively, it is preferable that the tips of the first and second ridge teeth are flat.

The first and second ridge teeth have a trapezoidal or isosceles trapezoidal cross section so that the plastic container does not get stuck between the first and second ridge teeth. preferably formed.

The first ridge tooth and the second ridge tooth are located on both leg portions such that the cap portion is sufficiently crushed over a long range by the first and second ridge teeth in the center of the engagement position. It is preferable to have a cross-sectional shape in which the sum of the length of the upper base and the length of the upper base is two to three times the length of the lower base. If the sum of the length of both legs and the length of the upper base is less than twice the length of the lower base, it may not be possible to compress the cap and the cap ring enough to separate them. Also, if the sum of the length of both legs and the length of the upper base exceeds three times the length of the lower base, the plastic container (container body) may break. More effectively, the first ridge tooth and the second ridge tooth are such that the sum of the length of the legs and the length of the upper base is 2.5 times or approximately 2.5 times the length of the lower base. It has a cross-sectional shape that is twice (within ±5% of 2.5 times).

In addition, the first protruded tooth and the second protruded tooth have a cross-sectional shape in which the length and height of the bottom are equal or approximately equal (the length of the bottom is within ±5% of the height). preferable. If the height exceeds the length of the bottom base, there is a risk that the plastic container may not be caught in the engaging position, and the plastic container may be caught on the outer periphery of the first crushing rotary drum or the second crushing rotary drum. There is also a possibility that it will adhere so that it is difficult to separate.

Furthermore, the first ridge tooth and the second ridge tooth advantageously have a cross-sectional shape in which the length of the lower base is two to three times the length of the upper base. If the length of the lower base is less than twice the length of the upper base, the inclination of the legs becomes too steep and there is a risk that the plastic container may not be caught in the engagement position, and the plastic container may not be able to reach the first push. There is also a risk that they will stick to the outer circumference of the rotary crushing drum or the second rotary crushing drum so as to be difficult to separate. In addition, if the length of the lower base exceeds three times the length of the upper base, the plastic container (container body) may be cut or broken by the tips of the first and second protrusion teeth. be. More preferably, the first ridge tooth and the second ridge tooth have a length of the lower base that is 2.7 times or approximately 2.7 times (±5% of 2.7 times) the length of the upper base. within).

The first protruded tooth and the second protruded tooth are, for example, meshed at the center of the meshing position so as to form a clearance path having a trapezoidal wavy cross section.

By using the cap separating device of the present invention, the cap can be efficiently separated from the plastic container.

1 is a plan view of a cap separator according to the present invention; FIG. 1 is a front view of a cap separator according to the present invention; FIG. 1 is a cross-sectional view of a cap separator according to the present invention; FIG. 1 is a perspective view of a cap separator according to the present invention; FIG. FIG. 4 is a conceptual diagram when a label peeler is connected to the cap separator according to the present invention; It is a figure for demonstrating the arrangement|positioning state of the 1st rotating drum for crushing, and the 2nd rotating drum for crushing. It is an enlarged view of the mesh|engagement position part of a 1st protrusion tooth|gear and a 2nd protrusion tooth|gear. FIG. 4 is an enlarged perspective view of a meshing position between a first ridge tooth and a second ridge tooth; FIG. 10 is a view showing a crushed state of the PET bottle at the meshing position between the first toothed protrusion and the second toothed protrusion. FIG. 2 is a conceptual diagram when a drainer and a sorter are connected together with a label peeler to the cap separator according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

First, the general configuration of the cap separator according to the present invention will be described with reference to FIGS. 1 to 4. FIG.

The cap separator 1 (cap separator) crushes the cap attached to the used PET bottle for beverages and the cap ring attached to the mouth of the PET bottle together with the PET bottle. A device for removing or facilitating removal from a PET bottle, comprising a casing 3, a first rotating crushing drum 5 and a second rotating crushing drum 7 arranged in the casing 3, and a second For example, a hydraulic first motor 9 for rotationally driving the rotary crushing drum 5 and a second hydraulic motor 11 for rotationally driving the second crushing rotary drum 7 are provided. .

The casing 3 is a rotary drum containing body having a PET bottle inlet 13 on the upper surface and a PET bottle outlet 15 on the lower surface, and is provided with support plates 17 and 19 at the lower end position of the front surface and the lower end position of the rear surface, respectively, A first bearing 21 for supporting the first rotating drum 5 for crushing and a second bearing 23 for supporting the second rotating drum 7 for crushing are attached to the support plates 17 and 19 .

The first rotating crushing drum 5 has a first rotating shaft 25, the second rotating crushing drum 7 has a second rotating shaft 27, and the first rotating crushing drum 5 is rotatably arranged in the casing 3 by a first rotating shaft 25 penetrating the front and rear surfaces of the casing 3 and rotatably supported by the first bearing 21, forming a second crushing rotating drum. 7 is rotatably arranged in the casing 3 by a second rotating shaft 27 passing through the front and rear surfaces of the casing 3 and rotatably supported by the second bearing 23 . The first rotary crushing drum 5 and the second rotary crushing drum 7 are arranged horizontally, parallel to each other and at the same height, and engage inside to crush the PET bottles passing through the engagement position 29. is configured as

The first motor 9 is attached to the first bearing 21 on the front side and connected to the first rotating shaft 25 of the first rotating drum 5 for crushing, and rotates the first rotating shaft 25 to rotate the first rotating drum 5 . The rotating drum 5 for crushing is rotated in the upper clockwise direction in FIG. 3 (the direction of the arrow X). The second motor 11 is attached to a second bearing 23 on the front side and connected to a second rotary shaft 27 of the second crushing rotary drum 7 to rotate the second rotary shaft 27. The second crushing rotary drum 7 is rotated in the counterclockwise direction (arrow Y direction) in FIG. 3 at the same speed as the first crushing rotary drum 5 .

In the cap separator 1 having such a configuration, the first rotating drum 5 for crushing and the second rotating drum 7 for crushing are rotated in opposite directions at a constant speed, and the caps are separated from the PET bottle inlet 13 . When the PET bottle C to which A and the cap ring B are attached is put into the casing 3, the PET bottle C moves to the meshing position 29 between the first crushing rotary drum 5 and the second crushing rotary drum 7. When passing through, it is thinly crushed into a corrugated shape together with the cap A and the cap ring B, and is discharged from the PET bottle outlet 15.例文帳に追加The cap A and the cap ring B attached to the outside of the PET bottle C are crushed, the screw part of the cap A is crushed and removed from the PET bottle C, the positioning annular projection of the PET bottle C is crushed, and the cap B is crushed. For example, the cap ring B is broken and removed from the PET bottle C. Even if the cap A and the cap ring B remain adhered to the PET bottle C and pass through the engagement position 29 and are discharged from the PET bottle outlet 15 (see FIGS. 5 and 10), for example, the cylindrical casing 31 It is removed from the PET bottle C when it is thrown into a PET bottle label peeler 37 having a conveying blade 35 on a rotating shaft 33 disposed inside and stirred or conveyed (see FIG. 5). Here, peeling teeth are formed on the radially outer end of the conveying blade 35 and the inner surface of the casing 31, and the PET bottle C is bitten into the narrow gap between the radially outer end of the conveying blade 35 and the inner surface of the casing 31 to remove the label and remove it. It can be configured to separate the cap A and the cap ring B which are not connected.

In addition, 38 in the figure is a handle used when moving the cap separator 1. As shown in FIG.

Next, the structures of the first crushing rotary drum 5 and the second crushing rotary drum 7 will be described with reference to FIGS. 6 and 7. FIG.

The first crushing rotary drum 5 extends longitudinally, i.e. parallel to the first rotation axis 25, on the outer peripheral surface 41 of the first cylindrical body 39, for example of length 600 mm and outer diameter 833 mm. A plurality of first ridge teeth 43 are formed at equal intervals in the circumferential direction, and each of the first ridge teeth 43 is formed to have an isosceles trapezoidal cross-section, and has a planar tooth tip. there is Here, 280 first protrusion teeth 43 are provided, and each first protrusion tooth 43 is formed over the entire length or substantially the entire length of the outer peripheral surface 41 of the first cylindrical body 39 . The cross-sectional shape of the first ridge tooth 43 is, for example, the lower base D1 is 6.5 mm or approximately 6.5 mm, the upper base E1 is 2.4 mm or approximately 2.4 mm, and the leg F1 is 6.8 mm or approximately 6 mm. .8 mm, an isosceles trapezoid with an angle G1 of 35° or approximately 35° between a pair of legs F1 and a height H1 of 6.5 mm or approximately 6.5 mm. Also, the first space 45 between adjacent first ridge teeth 43 corresponds to the cross-sectional shape of the first ridge tooth 43, or is equal to or substantially equal to the cross-sectional shape of the first ridge tooth 43. It has an equal isosceles trapezoidal shape. Then, the radius P is half the distance L between the rotation center of the first crushing rotary drum 5 and the rotation center of the second crushing rotary drum 7, and the first crushing drum A virtual circle J1 centered on the rotation center of the rotating drum 5 is positioned approximately in the middle of the tooth depth (height) of the first ridge tooth 43 or slightly on the tip side of the middle of the tooth depth of the first ridge tooth 43. configured to pass through Here, the tooth depth of the first ridge tooth 43 is, for example, 6.5 mm. passes through the ridge tooth 43 position of . For example, the virtual circle J1 has a diameter of 840 mm, the addendum circle K1 has a diameter of 846 mm, and the pitch (angle) L1 at which the first ridge teeth 43 are provided is 1.2857° or approximately 1.2857°.

Also, the second crushing rotary drum 7 extends longitudinally, i.e., parallel to the second rotating shaft 27, on the outer peripheral surface 49 of the second cylindrical body 47 having a length of 600 mm and an outer diameter of 833 mm, for example. The second ridge teeth 51 are formed by forming a large number of second ridge teeth 51 extending in the circumferential direction at equal intervals. trapezoid), and the tip of the tooth is planar. Here, 280 second protrusion teeth 51 are provided, and each second protrusion tooth 51 is formed over the entire length or substantially the entire length of the outer peripheral surface 49 of the second cylindrical body 47 . The cross-sectional shape of the second ridge tooth 51 is, for example, the lower base D2 is 6.5 mm or approximately 6.5 mm, the upper base E2 is 2.4 mm or approximately 2.4 mm, and the leg F2 is 6.8 mm or approximately 6 mm. .8 mm, an isosceles trapezoid with an angle G2 of 35° or approximately 35° between a pair of legs F2 and a height H2 of 6.5 mm or approximately 6.5 mm. Also, the second space 53 between adjacent second ridge teeth 51 corresponds to the cross-sectional shape of the second ridge tooth 51, or is equal to or substantially equal to the cross-sectional shape of the second ridge tooth 51. It has an equal isosceles trapezoidal shape. Then, the radius P is half the distance L between the rotation center of the first crushing rotary drum 5 and the rotation center of the second crushing rotary drum 7, and the second crushing drum A virtual circle J2 centered on the center of rotation of the rotating drum 7 is positioned approximately in the middle of the tooth depth (height) of the second ridge tooth 51 or slightly on the tip side of the middle of the tooth depth of the second ridge tooth 51. configured to pass through Here, the tooth depth of the second ridge tooth 51 is, for example, 6.5 mm, but the virtual circle J2 is the second tooth height of the tooth addendum: dedendum height=7:6, 8:5 or 9:4. passes through the ridge tooth 51 position of . For example, the virtual circle J2 has a diameter of 840 mm, the addendum circle K2 has a diameter of 846 mm, and the pitch (angle) L2 at which the second ridge teeth 51 are provided is 1.2857° or approximately 1.2857°.

At the point where the virtual circle J1 and the virtual circle J2 touch each other, the first ridge tooth 43 and the second ridge tooth 51 form a space 53 between the second ridge tooth 51 and a space between the first ridge tooth 43. 45 as a whole. More specifically, at the center of the meshing position 29, the first ridge tooth 43 and the second space 51 mesh with a clearance of, for example, 0.5 mm or approximately 0.5 mm, and the second ridge tooth 51 and the first space 45 are meshed with a clearance of, for example, 0.5 mm or approximately 0.5 mm. Therefore, at the center of the meshing position 29, the meshing of the first ridge tooth 43 and the second ridge tooth 51 forms a 0.5 mm or approximately 0.5 mm clearance path 55 with a cross-sectional trapezoidal wave shape. The addendum circle K1 of the first ridge tooth 43 is closest to the outer peripheral surface 49 of the second cylindrical body 47 (root circle of the second ridge tooth 51) (the center of the meshing position 29). , the addendum circle K2 of the second ridge tooth 51 is in contact with the outer peripheral surface 41 of the first cylindrical body 39 (the first ridge tooth 43) and the closest point (the center of the meshing position 29) with a clearance of, for example, 0.5 mm or approximately 0.5 mm.

As shown in FIG. 9, the PET bottle C passing through the engaging position 29 is flattened into a thin waveform along with the cap A and the cap ring B, and the cap A and the cap ring B are separated from the PET bottle C. As shown in FIG.

Referring to FIG. 10, a bottle processing system in which a draining feeder (draining machine) and a sorting machine are connected to a combination of cap separator 1 and label peeler 37 will be described.

In the bottle processing system 57, a draining feeder 59 is arranged to receive caps A, cap rings B and PET bottles C discharged from the cap separator 1. As shown in FIG. The draining feeder 59 has a discharge port 61 at its tip, and includes a transport box 63 that is inclined downward toward the front, and a vibration motor 65 that vibrates the transport box 63. Cap A, cap ring B and PET bottle C are configured to move in box 63 toward discharge port 61 . A large number of wedge wires 69 are arranged at the bottom 67 of the transport box 63, and the beverage remaining in the PET bottle C and spilling out of the PET bottle C is discharged through the gaps between the wedge wires 69. Become. The cap A, cap ring B and PET bottle C separated from the remaining beverage and discharged from the discharge port 61 are put into the label peeler 37 and separated from the label M peeled from the PET bottle C in the label peeler 37. are put into the sorting machine 71. A large number of sorting and conveying discs 73 are rotating in the sorter 71, the PET bottle C is conveyed toward the discharge port 75 in front, and the cap A and the cap ring B fall from the gap between the sorting and conveying discs 73. The PET bottle C is separated.

REFERENCE SIGNS LIST 1 cap separator 5 first rotary drum for crushing 7 second rotary drum for crushing 9 first motor 11 second motor 29 engagement position 43 first ridge tooth 45 first space 51 second second 53 Second space A Cap B Cap ring C PET bottle

Claims (9)

A cap separating device for separating a cap attached to an empty or used plastic container from the plastic container,
a first crushing rotating drum;
a second rotating crushing drum of the same diameter as said first rotating crushing drum, arranged to mesh with said first rotating crushing drum at a meshing position;
a drive motor that rotates the first rotating crushing drum and the second rotating crushing drum at the same rotational speed and in opposite directions so that the plastic container is wound in the engaged position;
A large number of first ridge teeth extending in the longitudinal direction are provided on the outer periphery of the first rotating drum for crushing at equal intervals in the circumferential direction, and the outer periphery of the second rotating drum for crushing is provided with the above-mentioned A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided at regular intervals in the circumferential direction. The space corresponds to the cross-sectional shape of the second ridge tooth, and the second space between the adjacent second ridge teeth corresponds to the cross-sectional shape of the first ridge tooth,
In the middle of the meshed position, the first ridge tooth is wholly received in the second space between the second ridge teeth, and the second ridge tooth is located between the first ridge teeth. Entirely contained in the first spaces between the teeth ,
A cap separating device , wherein the cap attached to the plastic container is broken or crushed at the engagement position . A cap separating device for separating a cap attached to an empty or used plastic container from the plastic container,
a first crushing rotating drum;
a second rotating crushing drum of the same diameter as said first rotating crushing drum, arranged to mesh with said first rotating crushing drum at a meshing position;
a drive motor that rotates the first rotating crushing drum and the second rotating crushing drum at the same rotational speed and in opposite directions so that the plastic container is wound in the engaged position;
A large number of first ridge teeth extending in the longitudinal direction are provided on the outer periphery of the first rotating drum for crushing at equal intervals in the circumferential direction, and the outer periphery of the second rotating drum for crushing is provided with the above-mentioned A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided at equal intervals in the circumferential direction,
When the half length of the interval between the rotation center of the first crushing rotary drum and the rotation center of the second crushing rotary drum is P, the first crushing rotation Virtual circles centered on the rotation center of the drum and the rotation center of the second crushing rotary drum and having a radius P correspond to the tooth depths of the first ridge teeth and the second ridge teeth. is formed to pass through the middle of
A cap separating device , wherein the cap attached to the plastic container is broken or crushed at the engagement position . A cap separating device for separating a cap attached to an empty or used plastic container from the plastic container,
a first crushing rotary drum;
a second rotating crushing drum of the same diameter as said first rotating crushing drum, arranged to mesh with said first rotating crushing drum at a meshing position;
a drive motor that rotates the first rotating crushing drum and the second rotating crushing drum at the same rotational speed and in opposite directions so that the plastic container is wound in the engaged position;
A large number of first ridge teeth extending in the longitudinal direction are provided on the outer periphery of the first rotating drum for crushing at equal intervals in the circumferential direction, and the outer periphery of the second rotating drum for crushing is provided with the above-mentioned A large number of second ridge teeth extending in the longitudinal direction and having the same cross-sectional shape as the first ridge teeth are provided at equal intervals in the circumferential direction,
At the center of the meshing position, the addendum circle of the first ridge tooth is in contact with the dedendum circle of the second ridge tooth, and the addendum circle of the second ridge tooth is in contact with the dedendum circle of the second ridge tooth. It is in contact with the root circle of the ridge tooth 1 ,
A cap separating device , wherein the cap attached to the plastic container is broken or crushed at the engagement position . 4. The cap separating device according to claim 1, wherein the tip of said first protruded tooth and said second protruded tooth are formed flat. 5. The cap separating device according to claim 4, wherein said first ridge tooth and said second ridge tooth are formed in a trapezoidal shape or an isosceles trapezoidal shape in cross section. The first ridge tooth and the second ridge tooth have a cross-sectional shape in which the sum of the length of both legs and the length of the upper base is two to three times the length of the lower base. 6. The cap separating device according to claim 5, characterized by: 7. The cap separating device according to claim 5, wherein said first protruding tooth and said second protruding tooth have a cross- sectional shape in which the length and height of the lower base are equal . 6. The first ridge tooth and the second ridge tooth have a cross-sectional shape in which the length of the lower base is two to three times the length of the upper base. The cap separating device according to 6 or 7. 4. A clearance path according to claim 1, 2 or 3, characterized in that said first protruded tooth and said second protruded tooth form a clearance path having a trapezoidal wavy cross section at the center of said meshing position. Cap separating device.

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