WO2021039562A1

WO2021039562A1 - Container leak inspection method and method for forming outside air introduction hole in container body of delamination container

Info

Publication number: WO2021039562A1
Application number: PCT/JP2020/031392
Authority: WO
Inventors: 康佑相原; 公普中野
Original assignee: キョーラク株式会社
Priority date: 2019-08-26
Filing date: 2020-08-20
Publication date: 2021-03-04
Also published as: CN113767271A

Abstract

Provided is a leak inspection method whereby a leak from the bottom part of a container can be detected.　Through the present invention, there is provided a container leak inspection method, said method comprising an inspection step, the inspection step being performed using a detection mechanism provided with a bottomed cylindrical cup and a flow meter, the flow meter being provided so as to be communicated with an internal space of the cup, and the presence/absence of a leak being determined in the inspection step on the basis of the flow rate detected by the flow meter when the inside of an inner bag is compressed in a state in which the cup is positioned so as to cover the bottom part of the container.

Description

Leak inspection method for containers and method for forming outside air introduction holes in the container body of laminated peeling containers

(First viewpoint)
The present invention relates to a container leak inspection method.

(Second viewpoint)
The present invention relates to a method of forming an outside air introduction hole in a container body of a laminated peeling container in which an inner bag shrinks as the contents decrease.

(First viewpoint)
In Patent Document 1, air is supplied into the inner bag, and the presence or absence of holes in the inner bag is inspected based on whether the pressure inside the inner bag reaches a predetermined value after a lapse of a predetermined time.

(Second viewpoint)
Patent Document 2 discloses a method of forming an outside air introduction hole in the container body of a laminated peeling container in which the inner bag shrinks as the contents decrease. Specifically, the outside air introduction hole is formed by pressing the blade portion of the drilling drill against the outer shell.

Patent 3303234 JP-A-2019-81574

(First viewpoint)
In the method of Patent Document 1, if the inner bag is unintentionally inflated when air is supplied into the inner bag, the inner bag is perforated even though there is no hole in the inner bag. Since it may be determined that it exists, a leak inspection method by another means is desired.

Further, in a container formed by using a tubular parison, air leaks may occur from the seal portion at the bottom, and it is desired to reliably detect the leak from this portion.

The present invention has been made in view of such circumstances, and provides a leak inspection method capable of detecting a leak from the bottom of a container.

(Second viewpoint)
In Patent Document 2, a suction device is connected to a suction head, and by operating this suction device, the facets around the drill are sucked and removed, and the intake / exhaust device is connected to a cavity extending over the entire length of the drill. By operating this intake / exhaust device, the cutting piece is held at the tip of the drill.

Since the suction force of the suction device and the intake / exhaust device varies slightly, in the configuration of Patent Document 2, the pressure difference between the circumference of the drilling drill and the cavity of the drilling drill fluctuates, and as a result, the excision piece becomes It may not be held or the excision may penetrate deep into the cavity of the drill.

The present invention has been made in view of such circumstances, and provides a method for forming an outside air introduction hole capable of stably holding a cut piece in a drill.

(First viewpoint)
According to the present invention, there is a leak inspection method for a container, wherein the method includes an inspection step, and the inspection step is performed by using a detection mechanism including a bottomed tubular cup and a flow meter, and the flow rate is described. The meter is provided so as to communicate with the internal space of the cup, and in the inspection step, the flow meter is used when the inside of the inner bag is pressurized with the cup arranged so as to cover the bottom of the container. A method of determining the presence or absence of a leak based on the flow rate detected by is provided.

In the method of the present invention, the presence or absence of a leak is determined based on the flow rate detected by the flow meter when the inside of the inner bag is pressurized with the cup arranged so as to cover the bottom, so that the leak from the bottom is high. It can be detected with high accuracy.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, according to the method described above, the detection mechanism includes a bottom rubber member arranged on the bottom surface of the cup, and in the inspection step, the peripheral edge of the bottom portion is brought into contact with the bottom rubber member. It is a method of arranging the cup in the rubber.
Preferably, the method described above comprises a gripping step, wherein the gripping step is performed using a bottom-side device having a gripping mechanism and the detection mechanism, in which the cup covers the bottom. This is a method in which the gripping mechanism grips the body of the container in the state of being held.
Preferably, the method described above comprises an installation step, the installation step being performed using a mouth side device, the mouth side device comprising a mouth rubber member and a pressurizer, said mouth. The portion rubber member has a ventilation hole, and in the installation step, the container is installed so that the end surface of the mouth portion of the container is brought into contact with the mouth portion rubber member, and in the inspection step, the pressurizer Is a method of pressurizing the inside of the inner bag by blowing air into the inner bag through the ventilation hole and the opening of the mouth portion.
Preferably, in the method described above, the mouth-side device includes an upright portion, and the upright portion includes a container holding portion for holding the mouth portion of the container or a portion in the vicinity thereof, and the container holding portion. It is a method including an accommodating portion for accommodating a mouth rubber member.
Preferably, it is the method described above, wherein the container has an outer shell and an inner bag, and the inner bag is configured to shrink as the contents decrease.

(Second viewpoint)
According to the present invention, it is a method of forming an outside air introduction hole of a container body of a laminated peeling container including a holding step and a cut forming step. In the holding step, an outer shell and an inner bag are laminated. In the notch forming step, a suction head is used to form a decompression space, and a drill is used to make an annular notch in the outer shell in the decompression space. The suction head is provided with a suction hole for sucking the air and the chips in the suction head, and is configured to form the decompression space by the suction, and the hole is drilled. The drill includes a tip portion having a blade portion, a cavity reaching the tip portion, and a communication hole for communicating the cavity with the decompression space, and the notch causes the container body to be held by the holding jig. A method is provided in which the tip portion and the communication hole are arranged in the decompression space, and the blade portion is pressed against the outer shell while rotating the drilling drill.

In the present invention, the excision piece is formed with the tip portion and the communication hole arranged in the decompression space. In such a configuration, the pressure in the cavity of the drilling drill changes in conjunction with the pressure in the decompression space, so that even if the suction force of the suction device mounted on the suction head fluctuates, it will be around the drilling drill. Since the pressure difference in the cavity of the drilling drill hardly or not fluctuates, the excision piece can be stably held at the tip of the drilling drill.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.

Preferably, in the method described above, the holding jig is provided with a tubular portion having an end opening at one end, and the container body is inserted into the holding jig through the end opening. The main body is held by the holding jig, and the holding jig is provided with a drill opening for inserting the drill on the side surface of the tubular portion, and the drill is inserted through the drill opening to form the notch. Is the way to do it.
Preferably, in the method described above, the suction head is provided with a drill insertion hole through which the drill can be inserted, and the suction head is such that the drill insertion hole and the suction hole communicate with the drill opening. This is a method in which the drill is inserted through the drill insertion hole and the drill opening to form the notch.
Preferably, it is the method described above, wherein the communication hole has a diameter of 2.7 to 3.5 mm.
Preferably, in the method described above, the cavity is provided so as to reach the rear end of the drilling drill, includes a discharge step, and in the discharge step, the suction is performed by the suction head while performing the suction. This is a method in which air is blown into the cavity from the rear end to release a cut piece held at the tip portion.

FIG. 5 is a perspective view of a container 1 to be inspected for leaks in the first embodiment of the first aspect of the present invention. It is a perspective view of the leak inspection apparatus 2. It is an exploded perspective view of the bottom side device 3 (bracket 33 is not shown). It is an exploded perspective view of the mouth side device 4. It is sectional drawing in the state which the container 1 is installed in the mouth side device 4. FIG. 6A shows a state after the bottom portion 7b is covered with the cup 32a, and FIG. 6B shows a state after the body portion 7a is gripped by the gripping mechanism 31 from the state of FIG. 6A. It is a perspective view which shows the state after moving the bottom side device 3 which grasped a container 1 right above the mouth side device 4. FIG. 5 is a perspective view showing a state after the bottom side device 3 is lowered from the state of FIG. 7 and the container 1 is installed in the mouth side device 4. It is a front view which shows only the container body 103 of the laminated peeling container 101. 9 is a cross-sectional view corresponding to the AA cross section in a state where the valve member 105 is attached to the container body 103 of FIG. FIG. 5 is a cross-sectional view (same cross section as in FIG. 10) showing a state immediately before the container body 103 is held by the holding jig 104. It is sectional drawing which shows the state which held the container body 103 by the holding jig 104. 13A is a cross-sectional view of the holding jig 104 (the same cross-sectional view as FIG. 11), FIG. 13B is a cross-sectional view taken along the line BB in FIG. 13A, and FIG. 13C is a view seen from the direction of arrow C in FIG. 13A. .. 14A is a right side view of FIG. 13A, and FIG. 14B is a sectional view taken along line DD in FIG. 13A. A state in which the locking piece 106 is held in the locking piece holding groove 104i is shown, FIG. 15A is a cross-sectional view corresponding to FIG. 13A, and FIG. 15B is a right side view corresponding to FIG. 14A. It is sectional drawing which shows the state which a drill 130 is brought into contact with a container body 103. It is an enlarged view of the region A in FIG. The drill 130 is shown, FIG. 18A is a perspective view, FIG. 18B is an enlarged view of the vicinity of the tip portion 130c of FIG. 18A, FIG. 18C is a plan view of FIG. 18A, and FIG. 18D is a sectional view taken along the line AA in FIG. 18C. It is an enlarged view of the part corresponding to the region A in FIG. 17, and shows the state which the cut 115b was formed by the drill 130.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

1. 1. First viewpoint 1-1. First Embodiment The leak inspection method of the container of the first embodiment of the first aspect of the present invention will be described.

1-1-1. Container 1
First, the container 1 to be inspected for leaks will be described with reference to FIGS. 1 and 6.

The container 1 has a bottomed tubular shape and includes an accommodating portion 7 for accommodating the contents and a mouth portion 9 for discharging the contents from the accommodating portion 7. The accommodating portion 7 includes a body portion 7a and a bottom portion 7b. The mouth portion 9 is provided with an engaging portion (male threaded portion) 9d so that a cap or a pump can be attached.

The bottom 7b is provided with a central concave region 29a and a peripheral region 29b provided around the central concave region 29a, and the central concave region 29a is provided with a seal portion 27. The seal portion 27 preferably protrudes from the bottom surface in order to increase the seal strength, but may not protrude. The peripheral edge region 29b is provided with a peripheral concave region 29c connected to the central concave region 29a.

Container 1 can be formed by direct blow molding. In this case, the seal portion 27 is formed by crushing the tubular parison with a pair of split dies and welding the facing surfaces of the parison to each other. At this time, if the welding is insufficient, a leak occurs in the seal portion 27, so that a leak is likely to occur in the seal portion 27, and the technical significance of inspecting the leak from this portion is great.

As shown in FIG. 6, the container 1 is a so-called laminated peeling container which has an outer shell 12 and an inner bag 14 and the inner bag 14 shrinks as the contents decrease. In such a container, since it is difficult for outside air to enter the inner bag 14, deterioration of the contents is suppressed. Further, in the laminated peeling container, leakage at the sealing portion 27 is likely to occur, so that the technical significance of applying the present invention is great. The container 1 may be a single-walled container having no inner bag. In this case, the container 1 preferably has a multi-layer structure. This is because in the case of a multi-layer structure, leakage is likely to occur in the seal portion 27, and the technical significance of applying the present invention is great.

The outer shell 12 is composed of, for example, a polyolefin such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, or an ethylene-propylene copolymer. The inner bag 14 is preferably composed of a plurality of layers. For example, an EVOH layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin can be used for the layer in contact with the outer shell 12, and an inner surface layer made of the above-mentioned polyolefin can be used as the layer in contact with the contents. .. Then, it is preferable to provide an adhesive layer between the EVOH layer and the inner surface layer.

The outer shell 12 is provided with an outside air introduction hole 15. The outside air introduction hole 15 is preferably provided in the accommodating portion 7. As a result, outside air can be introduced between the outer shell 12 and the inner bag 14. The outside air introduction hole 15 may be formed before or after the leak inspection, but it is preferably formed before the leak inspection. A valve member that controls the flow of gas through the outside air introduction hole 15 can be attached to the outside air introduction hole 15.

1-1-2. Leak inspection device 2
The leak inspection apparatus 2 used for carrying out the leak inspection method for the container 1 of the present embodiment will be described with reference to FIGS. 2 to 6. The leak inspection device 2 includes a bottom side device 3, a mouth side device 4, and a control unit (not shown). The control unit controls the leak inspection device 2 and the entire leak inspection using the leak inspection device 2.

<Bottom side device 3>
As shown in FIG. 3, the bottom side device 3 includes a gripping mechanism 31 and a detecting mechanism 32. The gripping mechanism 31 is configured to be able to grip the body portion 7a of the container 1. The detection mechanism 32 is configured to be capable of detecting an air leak from the bottom portion 7b (particularly, the seal portion 27). The bottom side device 3 is preferably mounted on a drive device configured to move the bottom side device 3. Preferably, the base 31a of the bottom side device 3 is attached to the drive device. The drive device is, for example, a device using a cylinder mechanism, and is a device configured so that the bottom side device 3 can be moved in the vertical direction and the horizontal direction by combining the cylinder mechanisms.

The gripping mechanism 31 includes a base 31a, a pair of linear sliders 31b, and a pair of arms 31c. The arm 31c is fixed to the linear slider 31b. The linear slider 31b is slidable with respect to the base 31a. By driving the pair of linear sliders 31b, the distance between the pair of arms 31c is variable, and by changing this distance, the container 1 can be gripped and opened.

The arm 31c includes an arm base 31c1, a pair of inclined portions 31c2 provided inclining with respect to the arm base 31c1, and a contact body 31c3 provided in each inclined portion 31c2. The inclined portion 31c2 is inclined so that the contact body 31c3 faces the direction of the container 1. The contact body 31c3 is a portion that comes into contact with the container 1. The contact body 31c3 is preferably made of rubber. Examples of the rubber include silicone rubber and urethane rubber. This makes it easier to grip the container 1 and prevents the container 1 from being damaged when gripping the container 1.

As shown in FIGS. 3 and 6, the detection mechanism 32 includes a bottomed tubular cup 32a, a flow meter 32b, and a bottom rubber member 32c. The cup 32a is fixed to the base 31a via the bracket 33. A recess 32a2 is provided on the bottom surface 32a1 of the cup 32a. The recess 32a2 is provided with a through hole 32a3 that communicates with the outside of the cup 32a. The through hole 32a3 communicates with the flow meter 32b via the joint 32d and the air tube 32e. Therefore, the internal space of the cup 32a (more specifically, the internal space of the recess 32a2) is communicated with the flow meter 32b. The flow meter 32b is configured to be able to measure the flow rate of the gas flowing out from the internal space of the cup 32a, and the presence or absence of a leak is determined based on the flow rate detected by the flow meter 32b. The bottom rubber member 32c is annular and is arranged around the recess 32a2 on the bottom surface 32a1. The bottom rubber member 32c is made of rubber (preferably silicone rubber). In the inspection step described later, as shown in FIGS. 1 and 6, the peripheral region 29b is pressed against the bottom rubber member 32c. As a result, the peripheral region 29b is suppressed from being damaged, and the degree of adhesion between the cup 32a and the bottom portion 7b is enhanced.

<Mouth side device 4>
As shown in FIGS. 4 to 5, the mouth side device 4 includes a base 41, a mouth rubber member 42, an upright portion 43, and a pressurizer 44.

The base 41 and the mouth rubber member 42 are provided with

ventilation holes

41a and 42a. The mouth rubber member 42 is arranged on the base 41 so that the

ventilation holes

41a and 42a communicate with each other. The mouth rubber member 42 is made of rubber (preferably silicone rubber). The upright portion 43 includes a container holding portion 43a for holding the mouth portion 9 of the container 1 or a portion in the vicinity thereof, and a housing portion 43b for accommodating the mouth portion rubber member 42. The upright portion 43 is fixed on the base 41 so that the mouth rubber member 42 is accommodated in the accommodating portion 43b. The container holding portion 43a holds the container 1 so that the opening 9a of the mouth portion 9 communicates with the ventilation hole 42a. The end face 9b of the mouth portion 9 comes into contact with the mouth portion rubber member 42 while the container 1 is held by the container holding portion 43a. By bringing the end surface 9b of the mouth portion 9 into contact with the mouth portion rubber member 42, the internal space of the inner bag 14 can be easily pressurized.

As shown in FIG. 5, the ventilation hole 41a is connected to the pressurizer 44 via the joint 45 and the air tube 46. The inside of the inner bag 14 is pressurized by blowing the air from the pressurizer 44 into the inner bag 14 through the

ventilation holes

41a and 42a.

1-1-3. Leak Inspection Method The leak inspection method according to the embodiment of the present invention includes a gripping step, an installation step, and an inspection step. One or both of the gripping process and the installation process can be omitted or changed to another method. This leak inspection may be performed before the preliminary peeling step of pre-peeling the inner bag 14 from the outer shell 12, but it is preferably performed after the pre-peeling step. In this case, the preliminary peeling step

<Gripping process>
The gripping step can be performed using the bottom side device 3. In this step, as shown in FIG. 6, the gripping mechanism 31 grips the body portion 7a of the container 1 with the cup 32a covering the bottom portion 7b. In one example, the container 1 flows along the production line with the mouth portion 9 facing downward. When the container 1 approaches the position directly below the bottom side device 3 with the bottom side device 3 arranged above the production line, the drive device lowers the bottom side device 3 to lower the cup 32a, as shown in FIG. 6A. Covers the bottom portion 7b with, and then grips the body portion 7a with the gripping mechanism 31 as shown in FIG. 6B. FIG. 7 shows a state after the gripping mechanism 31 grips the body portion 7a.

<Installation process>
The installation step can be performed using the mouth side device 4. In this step, as shown in FIGS. 5 and 7 to 8, the container 1 is installed so that the end surface 9b of the mouth portion 9 of the container 1 is brought into contact with (preferably pressed) the mouth rubber member 42. In one example, after the bottom side device 3 grips the container 1 on the production line, the drive device moves the bottom side device 3 together with the container 1 above the mouth side device 4, as shown in FIG. 7, and then the figure. As shown in 8, the container 1 can be installed in the mouth side device 4 by bringing the bottom side device 3 closer to the mouth side device 4.

<Inspection process>
In the inspection step, as shown in FIGS. 6 and 8, leaks occur based on the flow rate detected by the flow meter 32b when the inside of the inner bag 14 is pressurized with the cup 32a arranged so as to cover the bottom 7b. Check for presence. As shown in FIG. 5, this pressurization can be performed by blowing air into the inner bag 14 through the vent holes 41a and 42a and the opening 9a by the pressurizer 44. The pressurizing pressure is, for example, 10 kPa to 100 kPa, specifically, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 kPa, and any of the numerical values exemplified here. It may be within the range between the two. If this pressure is too small, it may be difficult to detect the flow rate, and if this pressure is too large, the seal portion 27 may crack. The pressure in the present specification means a gauge pressure.

If the seal at the seal portion 27 is incomplete and the inside of the inner bag 14 is pressurized, air leaks through the seal portion 27. As shown in FIG. 6, the leaked air escapes from the through hole 32a3 to the outside of the cup 32a and is detected by the flow meter 32b. As shown in FIG. 6, since the cup 32a and the bottom portion 7b are not in close contact with each other in the peripheral concave region 29c, a part of the leaked air escapes to the outside through the peripheral concave region 29c, but the leaked air. Since the rest of the above is detected by the flow meter 32b through the through hole 32a3, the leak from the seal portion 27 can be detected even if the recess 32a2 is not sealed.

On the other hand, if there is no air leak in the seal portion 27, the flow rate detected by the flow meter 32b becomes substantially zero. Therefore, the presence or absence of air leakage can be determined by the seal portion 27 depending on whether or not the flow rate detected by the flow meter 32b is equal to or higher than a predetermined threshold value. The threshold value is, for example, 1 to 10 ml / min, and specifically, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ml / min, and the numerical values exemplified here are used. It may be within the range between any two.

If it is determined by this inspection that no leak has occurred in the seal portion 27, the container 1 is returned to the production line. On the other hand, if it is determined that a leak has occurred in the seal portion 27, the container 1 is discarded or returned to the production line after being treated to stop the leak.

1-2. Other Embodiments-In the container 1 of the above-described embodiment, the outer shell 12 is provided with the outside air introduction hole 15 to introduce the outside air between the outer shell 12 and the inner bag 14, but the outer shell 12 is introduced in the seal portion 27. A gap may be provided between the inner bag 14 and the inner bag 14, and outside air may be introduced between the outer shell 12 and the inner bag 14 through this gap.
-In the above embodiment, the bottom side device 3 has both the gripping mechanism 31 and the detecting mechanism 32, but the gripping mechanism 31 and the detecting mechanism 32 may be provided in separate devices.

2. 2. Second viewpoint 2-1. Laminated peeling container As shown in FIGS. 9 to 10, the laminated peeling container 101 of the second aspect of the present invention includes a container body 103 and a valve member 105. The container body 103 includes an accommodating portion 107 for accommodating the contents, and a mouth portion 109 having a mouth opening 109 g for discharging the contents from the accommodating portion 107. The accommodating portion 107 is provided with a shoulder portion 108. The radius of curvature of the shoulder portion 108 is 4 mm or less, preferably 1 to 3 mm.

As shown in FIG. 10, the container body 103 includes an outer shell 112 and an inner bag 114 in the accommodating portion 107 and the mouth portion 109. The inner bag 114 contracts as the inner bag 114 separates from the outer shell 112 as the contents decrease.

The outer shell 112 is composed of, for example, polyolefins such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, and ethylene-propylene copolymer. The outer shell 112 is preferably formed to be thicker than the inner bag 114 so as to have high resilience.

The inner bag 114 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the inner surface side of the container of the EVOH layer, and an adhesive layer provided between the EVOH layer and the inner surface layer. By providing the EVOH layer, the gas barrier property and the peelability from the outer shell 112 can be improved. The adhesive layer may be omitted.

The EVOH layer is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of an ethylene-vinyl acetate copolymer. The inner surface layer is a layer that comes into contact with the contents of the laminated stripping container 101, and is composed of, for example, the above-mentioned polyolefin. The adhesive layer is a layer having a function of adhering the EVOH layer and the inner surface layer.

The mouth portion 109 is provided with an engaging portion 109d that can be engaged with a cap with a check valve. The cap may be attached by a plug type or may be attached by a screw type.

As shown in FIG. 9, the accommodating portion 107 is provided with a recess 107a, and the recess 107a is provided with an outside air introduction hole 115. The outside air introduction hole 115 is a through hole provided only in the outer shell 112, and communicates the intermediate space 121 between the outer shell 112 and the inner bag 114 with the outer space S of the container body 103. The recess 107a is provided to avoid interference between the valve member 105 and the shrink film when the accommodating portion 107 is covered with the shrink film. Further, an air flow groove 107b extending from the recess 107a in the direction of the mouth 109 is provided so that the recess 107a is not sealed with the shrink film.

The valve member 105 has a function of adjusting the inflow and outflow of air into the intermediate space 121 between the outer shell 112 and the inner bag 114.

2-2. Method for Manufacturing Laminated Stripping Container Next, an example of the manufacturing method for the laminated stripping container 101 of the present embodiment will be described.
First, a laminated parison in a molten state having a laminated structure corresponding to the container body 103 to be manufactured is extruded, the laminated parison in the molten state is set in a split mold for blow molding, and the split mold is closed.
Next, a blow nozzle is inserted into the opening of the container body 103 on the mouth 109 side, and air is blown into the cavity of the split mold in a state where the mold is tightened. Next, the split mold is opened and the blow-molded product is taken out.

Next, the outside air introduction hole 115 is formed in the outer shell 112 of the container body 103 of the laminated peeling container 101. The outside air introduction hole 115 can be formed by a holding step, a notch forming step, and a releasing step. Hereinafter, each step will be described in detail. At least one of the holding step, the cut forming step, and the releasing step may be carried out by a method other than the methods shown below, or may be omitted.

<Holding process>
In the holding step, as shown in FIGS. 11 to 15, the container body 103 is held by the holding jig 104.

As shown in FIGS. 11 to 15, the holding jig 104 includes a tubular portion 104b having an end opening 104a at one end 104h, and the container body 103 is held in the holding jig 104 from the mouth 109 side from the end opening 104a. The container body 103 is held by the holding jig 104 by inserting it into the holding jig 104. Further, a drill opening 104c for inserting the drill 130 is provided on the side surface of the tubular portion 104b. A ventilation groove 104d extending along the close contact surface between the container body 103 and the cylinder portion 104b is provided on the inner surface of the cylinder portion 104b so as to communicate with the drill opening 104c. The ventilation groove 104d preferably has an end portion 104d1 (see FIG. 14B) of the ventilation groove 104d arranged at a position close to a region forming the outside air introduction hole 115 when the container body 103 is held by the holding jig 104. It is provided so as to. Further, the ventilation groove 104d is preferably provided so as to extend along the circumferential direction of the container body 103. Further, the ventilation groove 104d is preferably provided so as to surround the container body 103. By providing the ventilation groove 104d, when suction is performed through the drill opening 104c, an air flow in the direction from the container body 103 toward the drill opening 104c is likely to occur, and chips generated when the outside air introduction hole 115 is formed are generated. It is discharged promptly. Outside air flows into the ventilation groove 104d through a gap between the container body 103 and the holding jig 104. A connecting groove for connecting the outside of the holding jig 104 and the ventilation groove 104d may be separately provided. In this case, the air flow in the ventilation groove 104d at the time of suction becomes smoother.

As shown in FIGS. 11 to 12, the holding jig 104 is provided with a mouth holding portion 104e and a housing portion holding portion 104f. The mouth portion holding portion 104e holds the mouth portion 109 of the container body 103, and the accommodating portion holding portion 104f holds the accommodating portion 107 of the container body 103. Since the inner diameter of the mouth portion 104e is substantially equal to the outer diameter of the mouth portion 109, the mouth portion 109 is held by inserting the mouth portion 109 into the mouth portion holding portion 104e. The diameter of the accommodating portion holding portion 104f increases toward one end 104h, and has a substantially complementary shape to the accommodating portion 107. The outer surface of the accommodating portion 107 comes into contact with the accommodating portion holding portion 104f, and the accommodating portion 107 is held by the accommodating portion holding portion 104f. By holding the container body 103 by the mouth portion holding portion 104e and the accommodating portion holding portion 104f, it becomes possible to form the outside air introduction hole 115 in a stable state, and the variation in the shape of the outside air introduction hole 115 is reduced. ..

Further, the holding jig 104 is provided with a shoulder contact portion 104 g. The shoulder portion 104g abuts the shoulder portion 108 of the container body 103. The container body 103 is positioned in the height direction when the shoulder portion 108 abuts on the shoulder abutting portion 104g or the accommodating portion 107 abuts on the accommodating portion holding portion 104f.

Further, the holding jig 104 is provided with a locking piece holding groove 104i. The locking piece 106 is held in the locking piece holding groove 104i. When the container body 103 is held by the holding jig 104, the locking piece 106 is engaged with the air flow groove 107b of the container body 103. As a result, the container body 103 is positioned in the circumferential direction.

<Cut formation process>
In the notch forming step, as shown in FIGS. 16 to 19, in a state where the decompression space 151c is formed by using the suction head 151, the outside air introduction hole of the outer shell 112 is used by using the drill 130 in the decompression space 151c. An annular (preferably circular) notch 115b is formed at a position where the 115 is formed to form a cut piece 115a (see FIG. 19).

As shown in FIG. 17, the suction head 151 includes a drill insertion hole 151a through which a drill 130 can be inserted, and a suction hole 151b for sucking air and chips in the suction head 151. The suction head 151 is brought into close contact with the holding jig 104 so that the drill insertion hole 151a and the suction hole 151b communicate with the drill opening 104c. In the notch forming step, the drill 130 is inserted through the drill insertion hole 151a and the drill opening 104c to form the notch 115b.

Suction of chips is performed through the suction hole 151b. A hose 152 is connected to the suction hole 151b, and a suction device is connected to the hose 152. This makes it possible to suck air and chips in the suction head 151.

A decompression space 151c is formed by suction with the suction head 151. In the present embodiment, since the suction head 151 is in close contact with the drill opening 104c, the decompression space 151c is formed so as to straddle the space inside the suction head 151 and the space inside the drill opening 104c.

As shown in FIG. 18, the drill 130 has a tip 130c having a blade 130f, a cavity 130g reaching the tip 130c, a communication hole 130h for communicating the cavity 130g with the decompression space 151c, and a spindle fixing portion. It is provided with 130b.

The tip 130c has a tubular shape with a C-shaped cross section. As shown in FIG. 18B, the tip portion 130c is provided with a flat surface 130d and a notch portion 130e, and the side surface of the notch portion 130e in the circumferential direction is the blade portion 130f.

The width W of the flat surface 130d in the radial direction is preferably 0.1 to 0.2 mm, more preferably 0.12 to 0.18 mm. If the width W is too small, the inner bag 114 is easily damaged during drilling, and if the width W is too large, the blade portion 130f is difficult to contact the outer shell 112, so that it is difficult to perform drilling smoothly. The range in which the notch 130e is provided is preferably 30 to 270 degrees or more, more preferably 45 to 180 degrees, more preferably 60 to 120 degrees, and even more preferably 75 to 105 degrees. If this range is too large, the inner bag 114 is easily damaged during drilling, and if this range is too small, it is difficult to perform drilling smoothly. Specifically, this range is, for example, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270 degrees, and is exemplified here. It may be within the range between any two of the given numerical values.

Further, the inner surface of the tip portion 130c is provided with a tapered surface 130k that extends toward the tip. As a result, the cutting piece 115a generated at the time of drilling does not remain on the container body 103 side, and easily shifts to the drilling drill 130 side.

The communication hole 130h is a through hole provided on the side surface of the drill 130. The communication hole 130h is provided in the vicinity of the tip portion 130c. Since the cavity 130g and the decompression space 151c are communicated with each other through the communication hole 130h, the cavity 130g is also decompressed when the decompression space 151c is formed.

As shown in FIG. 17, the notch 115b has a blade while rotating the drill 130 with the container body 103 held by the holding jig 104 and the tip portion 130c and the communication hole 130h arranged in the decompression space 151c. It can be formed by pressing the portion 130f against the outer shell 112.

The drill 130 is connected to the spindle 150 capable of uniaxial movement and rotation at the spindle fixing portion 130b. Therefore, it is possible to move forward or backward while rotating the drill 130.

When the flat surface 130d is pressed against the outer shell 112 while rotating the drill drill 130, the flat surface 130d slightly sinks into the outer shell 112. As a result, the outer shell 112 partially enters the notch 130e, the blade portion 130f comes into contact with the outer shell 112, and the outer shell 112 is cut. As shown in FIG. 19, when the flat surface 130d reaches the boundary between the outer shell 112 and the inner bag 114, an annular notch 115b and a cut piece 115a are formed in the outer shell 112. The excision piece 115a is a portion formed by the notch 115b, and the outside air introduction hole 115 is formed by removing the excision piece 115a.

The excised piece 115a is held by the tip 130c by the suction force due to the decompression of the cavity 130 g and the frictional force between the excised piece 115a and the inner surface of the tip 130c. In the configuration of the present embodiment, the pressure in the cavity 130g changes in conjunction with the pressure in the decompression space 151c, so that even if the suction force of the suction device mounted on the suction head 151 fluctuates, the drill 130 Since the pressure difference between the periphery and the cavity 130g of the drill 130 does not fluctuate at all, the excision piece 115a can be stably held at the tip 130c.

The diameter of the communication hole 130h is, for example, 2.5 to 4.0 mm, preferably 2.7 to 3.5 mm. If this diameter is too small, the degree of decompression in the cavity 130 g is insufficient, and the holding of the excised piece 115a tends to be insufficient. On the other hand, if this diameter is too large, the degree of decompression in the cavity 130g becomes too high, and the excision piece 115a easily penetrates deep into the cavity 130g, making it difficult to release the excision piece 115a in the release step. Specifically, this diameter is, for example, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, It is 3.5, 3.6, 3.7, 3.8, 3.9, 4.0 mm, and may be within the range between any two of the numerical values exemplified here.

<Release process>
After the notch forming step, the drilling drill 130 is retracted and air is blown into the cavity 130g so that the cutting piece 115a held by the tip portion 130c can be discharged from the tip of the drilling drill 130. The released excision piece 115a can be sucked through the suction head 151.

The cavity 130g reaches the rear end 130i of the drill 130 (that is, the cavity 130g is provided over the entire length of the drill 130), and air is blown from the rear end 130i. This makes it possible to discharge the cutting piece 115a from the drilling drill 130 while performing suction by the suction head 151. In this case, it is preferable to provide a cavity 150 g extending over the entire length of the spindle 150, connect a blowing device to the rear end of the spindle 150 via a rotary joint, and blow air from the blowing device.

By the above steps, the formation of the outside air introduction hole 115 in the outer shell 112 is completed. After that, a preliminary peeling step of pre-peeling the inner bag 114 from the outer shell 112 is performed as necessary, or a valve member 105 is inserted into the outside air introduction hole 115 to complete the production of the laminated peeling container 101.

2-3. Other Embodiments-In the above embodiment, the tubular holding jig 104 having the drill opening 104c is used, but the holding jig 104 has a different configuration as long as the container body 103 can be held. You may.
In the above embodiment, the suction head 151 is brought into close contact with the holding jig 104, but the suction head 151 may be brought into close contact with the container body 103 directly. Further, as long as the decompression space 151c can be formed sufficiently for removing the facets and holding the cut piece 115a, there may be a gap between the suction head 151 and the container body 103 or the holding jig 104.

(Second viewpoint)
The outside air introduction hole 115 having a diameter of 4.4 mm was formed by using the apparatus having the configuration shown in FIGS. 16 to 17. In Examples 1 to 3, the diameters of the communication holes 130h of the drill 130 were 2.5 mm, 3.0 mm, and 4.0 mm, respectively.

In Example 1, the holding of the excised piece 115a at the tip 130c was slightly weak. On the other hand, in Example 3, the excised piece 115a may enter the tip 130c a little too deeply. In Example 2, the excision piece 115a was appropriately held by the tip portion 130c, and the excision piece 115a could be smoothly discharged from the tip portion 130c by blowing air into the cavity 130g. From this result, it was found that the diameter of the communication hole 130h is preferably 2.7 to 3.5 mm.

1: Container 2: Leak inspection device 3: Bottom side device 4: Mouth side device, 7: Housing part, 7a: Body, 7b: Bottom, 9: Mouth, 9a: Opening, 9b: End face , 12: outer shell, 14: inner bag, 15: outside air introduction hole, 27: seal portion, 29a: central concave region, 29b: peripheral region, 29c: peripheral concave region, 31: gripping mechanism, 31a: base, 31b: Linear slider, 31c: arm, 31c1: arm base, 31c2: inclined part, 31c3: contact body, 32: detection mechanism, 32a: cup, 32a1: bottom surface, 32a2: recess, 32a3: through hole, 32b: flow meter, 32c: Bottom rubber member, 32d: Joint, 32e: Air tube, 33: Bracket, 41: Base, 41a: Vent, 42: Mouth rubber member, 42a: Vent, 43: Standing part, 43a: Container holding Part, 43b: Accommodating part, 44: Pressurizer, 45: Joint, 46: Air tube, 101: Laminated peeling container, 103: Container body, 104: Holding jig, 104a: End opening, 104b: Cylinder part, 104c : Drill opening, 104d: Ventilation groove, 104d1: End, 104e: Mouth holding part, 104f: Accommodating part holding part, 104g: Shoulder contact part, 104h: One end, 104i: Locking piece holding groove, 105: Valve member, 106: locking piece, 107: accommodating part, 107a: recess, 107b: air flow groove, 108: shoulder part, 109: mouth part, 109d: engaging part, 109g: mouth opening, 112: outer shell , 114: Inner bag, 115: Outside air introduction hole, 115a: Cut piece, 115b: Notch, 121: Intermediate space, 130: Drill, 130b: Spindle fixing part, 130c: Tip part, 130d: Flat surface, 130e: Notch part , 130f: Blade, 130g: Cavity, 130h: Communication hole, 130i: Rear end, 130k: Tapered surface, 150: Spindle, 150g: Cavity, 151: Suction head, 151a: Drill insertion hole, 151b: Suction hole, 151c : Decompression space, 152: Hose, A: Area, S: External space

Claims

It is a leak inspection method for containers.
The method comprises an inspection step.
The inspection step is performed using a detection mechanism including a bottomed tubular cup and a flow meter.
The flow meter is provided so as to communicate with the internal space of the cup.
In the inspection step, a method of determining the presence or absence of a leak based on the flow rate detected by the flow meter when the inside of the inner bag is pressurized with the cup arranged so as to cover the bottom of the container.
The method according to claim 1.
The detection mechanism comprises a bottom rubber member located on the bottom surface of the cup.
In the inspection step, a method of arranging the cup so that the peripheral edge of the bottom is in contact with the bottom rubber member.
The method according to claim 1 or 2.
Equipped with a gripping process
The gripping step is performed using a gripping mechanism and a bottom-side device having the detection mechanism.
In the gripping step, a method in which the gripping mechanism grips the body of the container with the cup covering the bottom.
The method according to any one of claims 1 to 3.
Equipped with an installation process
The installation process is performed using the mouth side device,
The mouth side device includes a mouth rubber member and a pressurizer.
The mouth rubber member has ventilation holes and
In the installation step, the container is installed so that the end surface of the mouth portion of the container is brought into contact with the mouth rubber member.
In the inspection step, the pressurizer pressurizes the inside of the inner bag by blowing air into the inner bag through the ventilation hole and the opening of the mouth portion.
The method according to claim 4.
The mouth-side device includes an upright portion and
A method in which the erecting portion includes a container holding portion for holding the mouth portion of the container or a portion in the vicinity thereof, and an accommodating portion for accommodating the mouth rubber member.
The method according to any one of claims 1 to 5.
A method in which the container has an outer shell and an inner bag, and the inner bag is configured to shrink as the contents decrease.
A method for forming an outside air introduction hole in the container body of a laminated stripping container, which comprises a holding step and a notch forming step.
In the holding step, the container body formed by laminating the outer shell and the inner bag is held by the holding jig.
In the notch forming step, in a state where a decompression space is formed by using a suction head, an annular notch is formed in the outer shell by using a drilling drill in the decompression space to form a cut piece.
The suction head is provided with a suction hole for sucking the air and the chips in the suction head, and is configured to form the decompression space by the suction.
The drilling drill includes a tip portion having a blade portion, a cavity reaching the tip portion, and a communication hole for communicating the cavity with the decompression space.
In the notch, the blade portion is made into the outer shell while rotating the drilling drill in a state where the container body is held by the holding jig and the tip portion and the communication hole are arranged in the decompression space. A method formed by pressing.
The method according to claim 7.
The holding jig includes a tubular portion having an end opening at one end.
By inserting the container body into the holding jig through the end opening, the container body is held by the holding jig.
The holding jig is provided with a drill opening for inserting the drill on the side surface of the cylinder portion.
A method of inserting the drilling drill through the drill opening to form the notch.
The method according to claim 8.
The suction head includes a drill insertion hole through which the drill can be inserted.
The suction head is brought into close contact with the drill insertion hole and the suction hole so as to communicate with the drill opening.
A method of inserting the drill through the drill insertion hole and the drill opening to form the notch.
The method according to any one of claims 7 to 9.
The method, wherein the diameter of the communication hole is 2.7 to 3.5 mm.
The method according to any one of claims 7 to 10.
The cavity is provided so as to reach the rear end of the drill.
Equipped with a release process
In the release step, a method in which air is blown into the cavity from the rear end while suction is performed by the suction head to release a cut piece held at the tip.