JP2018019805A - Inner face electron beam irradiation device and electron beam sterilization facility equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner face electron beam irradiation device capable of extending life and an electron beam sterilization facility equipped with the same.SOLUTION: There is provided an inner face electron beam irradiation device for sterilizing an inner face of a PET bottle 1 with an aperture 2 formed by irradiation of electron beam E, having an electron beam irradiation nozzle 23 for irradiating the electron beam E to the inner face of the PET bottle 1. The electron beam irradiation nozzle 23 has an ejection window 41 ejecting the electron beam E, a nozzle body 31 for holding the ejection window 41 and a protective part 51 for protecting the nozzle body 31. The electron irradiation nozzle 23 has a lift 24 to make approach and alienation of the aperture 2 and the ejection window 41 and make a state of the PET bottle 1 at approach that the inner face is irradiated with the electron beam E.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an inner surface electron beam irradiation apparatus that sterilizes an inner surface of an object to be sterilized such as a container by electron beam irradiation, and an electron beam sterilization facility including the inner surface electron beam irradiation apparatus.

  If a company that handles containers for food and drink or medical use causes a food poisoning or medical accident due to insufficient sterilization of the container, the trust from society will be greatly lost. For this reason, these containers and the like need to be sterilized reliably in advanced countries where safety is important.

Currently, equipment that irradiates a container with an electron beam is used as a facility for surely sterilizing the container. In such equipment, in order to sterilize the outer surface and inner surface of the container reliably, an outer surface electron beam irradiation device that irradiates the outer surface of the container with an electron beam, and an inner surface electron beam irradiation device that irradiates the inner surface of the container with an electron beam And are provided. In the above equipment, when the container is irradiated with an electron beam, the container is surely sterilized, but corrosive gases such as ozone (O ₃ ) and nitric acid (HNO ₃ ) are generated by a chemical reaction by the electron beam. In order to prevent such corrosion of the equipment due to the corrosive gas, a ventilator for promoting the discharge of the corrosive gas is also provided in the equipment.

  By the way, the inner surface electron beam irradiation apparatus irradiates the inner surface of the container with the electron beam from the exit window of the electron beam irradiation nozzle while inserting the electron beam irradiation nozzle into the container from the opening. Since the corrosive gas tends to remain inside the container even when the ventilator is operated, the electron beam irradiation nozzle is exposed to the corrosive gas. For this reason, the electron beam irradiation nozzle is more easily corroded than other devices and equipment of the facility. In order to prevent such corrosion, it is conceivable to apply a conventional technique (see, for example, Patent Document 1) to cover the emission window of the electron beam irradiation nozzle with a catalyst film.

JP-A-10-142399

However, in an electron beam irradiation nozzle in which the exit window is covered with a catalyst film, even if corrosion is prevented to some extent in the exit window, the corrosive gas remaining inside the container has a strong oxidizing power. The side of the electron beam irradiation nozzle is susceptible to corrosion. Further, when the container is moved up and down with respect to the electron beam irradiation nozzle in order to insert the electron beam irradiation nozzle into the inside of the container from the opening, there is a possibility that the container and the device for lifting and lowering may collide with the electron beam irradiation nozzle . For this reason, the electron beam irradiation nozzle to which the above prior art is applied still has a short life.
Then, an object of this invention is to provide the inner surface electron beam irradiation apparatus which can lengthen a lifetime, and the electron beam sterilization equipment provided with the same.

In order to solve the above problems, an inner surface electron beam irradiation apparatus according to the first invention is an inner surface electron beam irradiation apparatus that sterilizes an inner surface of an object to be sterilized with an opening formed by electron beam irradiation,
An electron beam irradiation nozzle that irradiates the inner surface of the object to be sterilized with an electron beam is provided,
The electron beam irradiation nozzle has an emission window that emits an electron beam, a nozzle body that holds the emission window, and a protection unit that protects the nozzle body.
A drive unit is provided for bringing the opening of the sterilization object and the exit window of the electron beam irradiation nozzle closer to and away from each other, and for bringing the sterilization object to be irradiated with an electron beam on the inner surface during the approach. It is a thing.

  The inner surface electron beam irradiation apparatus according to the second invention has a cap body in which the protection part in the inner surface electron beam irradiation apparatus according to the first invention is provided at the tip of the nozzle body.

  Furthermore, in the inner surface electron beam irradiation apparatus according to the third invention, the protective part in the inner surface electron beam irradiation apparatus according to the first or second invention has a coating on the nozzle body.

  In addition, the inner surface electron beam irradiation apparatus according to the fourth aspect of the invention is an inert gas supply in which the protection unit in the inner surface electron beam irradiation apparatus according to any of the first to third aspects of the invention supplies an inert gas to the nozzle body. And an inert gas guide that guides the inert gas supplied from the inert gas supplier and discharges the inert gas from the tip of the nozzle body.

An electron beam sterilization facility according to a fifth invention includes an inner surface electron beam irradiation apparatus according to any one of the first to fourth inventions,
A transport device for transporting an object to be sterilized to the inner surface electron beam irradiation device;
And an outer surface electron beam irradiation device that sterilizes the outer surface of the object to be sterilized which is being transported by the transport device by electron beam irradiation.

  According to the inner surface electron beam irradiation apparatus and the electron beam sterilization equipment equipped with the inner surface electron beam irradiation apparatus, the nozzle main body is protected by the protection part, so that the life can be extended.

It is a schematic block diagram which shows the electron beam sterilization installation which concerns on embodiment of this invention. It is a schematic perspective view which shows the inner surface electron beam irradiation apparatus which the same electron beam sterilization equipment comprises. It is a partially notched side view which shows the electron beam emitter and elevator of the same inner surface electron beam irradiation apparatus. It is the partially cutaway side view which expanded the electron beam irradiation nozzle of the electron beam emitter which concerns on Example 1 of this invention, and its lower end vicinity. It is the partially cutaway side view which expanded the electron beam irradiation nozzle of the electron beam emitter which concerns on Example 2 of this invention, and its lower end vicinity. It is the partially cutaway side view which expanded the electron beam irradiation nozzle of the electron beam emitter which concerns on Example 3 of this invention, and its lower end vicinity. It is the partially cutaway side view which expanded the electron beam irradiation nozzle of the electron beam emitter which concerns on Example 4 of this invention, and its lower end vicinity.

Hereinafter, an inner surface electron beam irradiation apparatus according to an embodiment of the present invention and an electron beam sterilization facility including the same will be described with reference to the drawings.
First, an outline of an electron beam sterilization facility including an inner surface electron beam irradiation apparatus will be briefly described.

  This electron beam sterilization facility is a facility that sterilizes by irradiating an electron beam while conveying an object to be sterilized in which an opening is formed. The sterilization target in which the opening is formed is, for example, a container such as a plastic bottle or a preform body. The preform body is a raw material body before being formed into a PET bottle by blow molding, and has a test tube shape. In the following, for the sake of simplicity, the sterilization object in which the opening is formed will be described as a PET bottle.

As shown in FIG. 1, the electron beam sterilization facility has a large number of PET bottles from an upstream side where unsterilized PET bottles 1 are continuously charged to a downstream side where sterilized PET bottles 1 are collected. A conveying device 4 for continuously conveying 1 is provided. The electron beam sterilization facility 3 includes an outer surface electron beam irradiation device 5 that continuously irradiates the outer surface of the PET bottle 1 being transported to the transport device 4 and an electron beam E on the downstream side. 4 is provided with an inner surface electron beam irradiation device 6 that continuously irradiates the inner surface of the plastic bottle 1 being conveyed to the electron beam E. Moreover, the PET bottle 1 that is insufficiently sterilized by the irradiation with the electron beam E needs to be discarded as a defective product. A reject device 7 that performs this disposal is also provided in the electron beam sterilization facility 3. Furthermore, corrosive gases such as ozone (O ₃ ) and nitric acid (HNO ₃ ) are generated by the electron beam E irradiation. Such a corrosive gas causes corrosion of the devices 4 to 7 of the electron beam sterilization facility 3, and therefore needs to be discharged to the outside of the electron beam sterilization facility 3. A ventilation device 8 that promotes the discharge is also provided in the electron beam sterilization facility 3.
Next, the inner surface electron beam irradiation apparatus 6 will be described with reference to FIGS.

  As shown in FIG. 2, the inner surface electron beam irradiation device 6 continuously sterilizes the inner surfaces of a large number of PET bottles 1 transported to the circular path 4 </ b> C by the transport device 4. The inner surface electron beam irradiation device 6 is located above the circular path 4C and concentric with the circular path 4C, and a large number of the turntables 11 are arranged on the turntable 11 and located immediately above the circular path 4C. An electron beam emitter 12.

  The turntable 11 rotates so that a certain electron beam emitter 12 is positioned directly above the PET bottle 1 conveyed to the circular path 4C. As shown in FIG. 3, the electron beam emitter 12 mainly includes a vacuum chamber 20 having a vacuum inside, a fixture 22 for fixing the vacuum chamber 20 to the turntable 11, and a downward direction from the vacuum chamber 20. An extending electron beam irradiation nozzle 23 is included. The vacuum chamber 20 has an electron generation source 21 disposed therein, thereby generating a large number of electrons e and accelerating downward. The electron beam irradiation nozzle 23 communicates with the vacuum chamber 20 and has a vacuum atmosphere inside. The electron beam irradiation nozzle 23 emits a number of electrons e accelerated in the vacuum chamber 20 from the lower end as an electron beam E. Therefore, in order to sterilize the inner surface of the PET bottle 1, the electron beam irradiation nozzle 23 is inserted into the PET bottle 1 through the opening 2 as shown in FIGS. It is necessary to irradiate with an electron beam E. For this reason, as shown in FIG. 3 (omitted in FIG. 2), the inner surface electron beam irradiation device 6 is provided with an elevator 24 (an example of a drive unit) that moves the PET bottle 1 up and down. The elevator 24 raises the plastic bottle 1 from the circular path 4C, thereby inserting the electron beam irradiation nozzle 23 into the inside of the plastic bottle 1 from the opening 2 and lowering the plastic bottle 1 from the state. The electron beam irradiation nozzle 23 is removed from the inside of the PET bottle 1. The elevator 24 is not particularly limited as long as it raises and lowers the PET bottle 1. For example, the gripper 25 that grips the PET bottle 1, a guide member 26 that guides the gripper 25 in the vertical direction, and the guide member 26. And an actuator (not shown) for moving the gripper 25 in the vertical direction.

  As shown in FIG. 3, the electron beam irradiation nozzle 23 is arranged at the lower end of the electron beam irradiation nozzle 23, emits an electron beam E, a nozzle body 31 that holds the emission window 41, and protects the nozzle body 31. And a protection unit 51. The protection unit 51 is not particularly limited as long as it protects the nozzle body 31. For example, the protection unit 51 may be a member that prevents contact between the nozzle body 31 and a corrosive gas or the like by a solid, such as a protective member disposed on the nozzle body 31, and a gas or liquid is blown into the nozzle body 31. The fluid may prevent contact between the nozzle body 31 and the corrosive gas.

  Thus, according to the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 including the same, the nozzle body 31 is protected by the protection unit 51 in the electron beam irradiation nozzle 23, so that the life can be extended. it can.

  Hereinafter, the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 including the inner surface electron beam irradiation apparatus 6 according to Examples 1 to 4 showing the above embodiment more specifically will be described. In the following Examples 1 to 4, the configuration of the electron beam irradiation nozzle 23 is shown more specifically, and the other configuration is the same as that of the above embodiment, and the description thereof is omitted.

  Hereinafter, the electron beam irradiation nozzle 23 according to the first embodiment will be described in detail with reference to FIG.

  As shown in FIG. 4, the electron beam irradiation nozzle 23 that can be inserted into the inside of the plastic bottle 1 from the opening 2 is held by a cylindrical nozzle body 31 and a lower end of the nozzle body 31 to be an electron beam E (see FIG. 4). 4 to 7), and a cap body 52 (which is an example of a protection portion 51) that protects the lower end of the nozzle body 31.

  The nozzle body 31 includes a general-purpose corrosion-resistant portion 32 made of a general-purpose corrosion-resistant material (for example, stainless steel), a heat-conducting portion 36 made of a material having high thermal conductivity (for example, copper), and the general-purpose corrosion-resistant portion 32. A welding affinity portion 37 made of a material (for example, nickel) for facilitating welding. The general-purpose corrosion-resistant portion 32 has a double shell structure including an outer shell 33 and an inner shell 34 shorter than the outer shell 33. In the general-purpose corrosion-resistant part 32, a refrigerant space for circulating the coolant 35 is formed between the outer shell 33 and the inner shell 34. The heat conducting part 36 is connected to the lower end of the inner shell 34 of the general-purpose corrosion-resistant part 32 in order to take the heat of the emission window 41 heated by the electron beam E and transmit it to the coolant 35. That is, the heat conducting part 36 is arranged so as to compensate for a shorter part of the inner shell 34 of the general-purpose corrosion-resistant part 32 than the outer shell 33, and a refrigerant space for circulating the coolant 35 is formed between the outer shell 33. Has been.

  The said exit window 41 is the foil 41 and grid (illustration omitted) comprised with the high corrosion resistance material (for example, titanium) which has corrosion resistance higher than the said general purpose corrosion resistance material. Since the grid improves the strength of the exit window 41, the grid is omitted from the configuration of the exit window 41 if the strength of the exit window 41 is secured only by the foil 41. The exit window 41 is disposed between the lower end of the nozzle body 31 and the upper end of the cap body 52.

  The cap body 52 is a ring-shaped member made of a highly corrosion-resistant material (for example, titanium) having higher corrosion resistance than the general-purpose corrosion-resistant material. The cap body 52 is designed to have an inner diameter so that the electron beam E is emitted from the inner side through the emission window 41 with an appropriate cross section. Furthermore, the outer diameter of the cap body 52 is designed so that the lower end of the nozzle body 31 is not exposed to the outside of the electron beam irradiation nozzle 23. More specifically, the cap body 52 has an outer diameter that is equal to or greater than the outer diameter of the lower end of the nozzle body 31, and an inner diameter that is equal to or greater than the inner diameter of the lower end of the nozzle body 31. Have In addition, as shown in FIG. 4, the cap body 52 is configured to extend downward from the outer peripheral portion thereof. In other words, by increasing the distance between the lower end of the cap body 52 and the exit window 41, even if an obstacle collides with the lower end, the obstacle collides with the exit window 41 which is thin and easily broken. Configured to be difficult.

  As described above, according to the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 having the same according to the first embodiment, the electron beam irradiation nozzle 23 has a lower end of the nozzle body 31, that is, inside the PET bottle 1. Since the portion exposed to the corrosive gas staying for the longest time is protected by the cap body 52, the nozzle body 31 is efficiently protected from the corrosive gas, and as a result, the life can be further extended. it can.

  In addition, even if an obstacle or the like collides with the lower end of the cap body 52, the obstacle does not easily collide with the exit window 41 which is thin and easily torn. Therefore, the nozzle body 31 and the exit window 41 are protected from the collision of the obstacle. As a result, the lifetime can be further increased.

  Hereinafter, the electron beam irradiation nozzle 23 according to the second embodiment will be described in detail with reference to FIG.

  In the electron beam irradiation nozzle 23 according to the second embodiment, the protection unit 51 is not the cap body 52 described in the first embodiment, but a coating 53 that covers the side surface of the nozzle body 31. Note that the same reference numerals in the second embodiment denote the same parts as in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 5, the electron beam irradiation nozzle 23 that can be inserted into the inside of the PET bottle 1 from the opening 2 is the entire surface of the portion that can be inserted into the inside of the PET bottle 1 from the side of the nozzle body 31. Is coated 53 (an example of the protective part 51). The coating 53 is, for example, a titanium film or a diamond-like carbon film.

  Thus, according to the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 including the same according to the second embodiment, the side surface of the nozzle body 31 can be inserted into the plastic bottle 1 from the opening 2. Since the entire surface of the portion is protected by the coating 53, the nozzle body 31 is protected from the collision of corrosive gas and obstacles in a wide range, and as a result, the life can be further extended.

  Hereinafter, the electron beam irradiation nozzle 23 according to the third embodiment will be described in detail with reference to FIG.

  In the electron beam irradiation nozzle 23 according to the third embodiment, the protective portion 51 is not the coating 53 described in the second embodiment, but an outer peripheral tube 54 that surrounds the nozzle body 31 outward, and the nozzle main body 31 and the outer peripheral tube 54. It is the inert gas supply device 61 which supplies an inert gas between. Here, the inert gas in this specification means a gas having a lower activity than the corrosive gas, and is a concept including air. Note that the same reference numerals in the third embodiment denote the same parts as in the first and second embodiments, and a description thereof will be omitted.

As shown in FIG. 6, the electron beam irradiation nozzle 23 that can be inserted into the inside of the PET bottle 1 from the opening 2 has an outer peripheral tube 54 (an example of the protection unit 51) that surrounds the nozzle body 31 outward. The outer peripheral tube 54 has an outer diameter passing through the opening 2 of the plastic bottle 1 (that is, smaller than the opening 2), and may be detachable as necessary. Further, the outer peripheral tube 54 not only protects the nozzle body 31 from collision of obstacles, but also guides an inert gas (nitrogen N ₂ gas as an example in FIG. 6) from the outside to the inside of the PET bottle 1. In addition, the corrosive gas (ozone O ₃ gas as an example in FIG. 6) staying inside the PET bottle 1 is also discharged to the outside. For this reason, the outer peripheral tube 54 is arranged so as to form a ventilation space 56 between the nozzle body 31 and the electron beam irradiation nozzle 23 allows the inert gas to enter the ventilation space 56 from the outside of the PET bottle 1. An inert gas supply device 61 is provided. Therefore, the outer peripheral pipe 54 is also an inert gas guide part that guides the inert gas supplied by the inert gas supply device 61 and discharges it from the tip part of the nozzle body 31.

  As described above, according to the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 having the same according to the third embodiment, the side surface of the nozzle body 31 is protected by the outer tube 54 and the outer tube 54 and the non-circular tube. Since the inside of the PET bottle 1 is replaced from the corrosive gas to the inert gas by the active gas supply device 61, the nozzle body 31 is protected from the collision of the corrosive gas and the obstacle in a wide range. , Can extend the life.

  Hereinafter, the electron beam irradiation nozzle 23 according to the fourth embodiment will be described in detail with reference to FIG.

  In the electron beam irradiation nozzle 23 according to the fourth embodiment, the protection unit 51 is disposed along the outer surface of the nozzle body 31 instead of the outer peripheral tube 54 that surrounds the nozzle body 31 described in the third embodiment. A ventilation pipe 55. Note that the same reference numerals in the fourth embodiment denote the same components as those in the first to third embodiments, and a description thereof will be omitted.

As shown in FIG. 7, the electron beam irradiation nozzle 23 that can be inserted into the inside of the plastic bottle 1 from the opening 2 is arranged along the outer surface of the nozzle body 31 in the longitudinal direction of the nozzle body 31. It has a vent pipe 55 (an example of the protection part 51). These vent pipes 55 have outer diameters that pass through the opening 2 of the plastic bottle 1 together with the nozzle body 31. In the same manner as in the third embodiment, the two vent pipes 55 are formed inside the PET bottle 1 from corrosive gas (ozone O ₃ gas as an example in FIG. 7) to inert gas (nitrogen N ₂ as an example in FIG. 7). In addition to the replacement with gas), the nozzle body 31 is also protected from the collision of obstacles. Of course, the vent pipe 55 is also an inert gas guide part that guides the inert gas supplied from the inert gas supplier 61 and discharges it from the tip of the nozzle body 31. Note that the number of vent pipes 55 is not limited to two as described above, and one or three or more are selected as necessary.

  As described above, according to the inner surface electron beam irradiation apparatus 6 and the electron beam sterilization equipment 3 having the same according to the fourth embodiment, the side surface of the nozzle body 31 is protected by the vent pipe 55, and Since the inside of the PET bottle 1 is replaced from the corrosive gas to the inert gas by the active gas supply device 61, the nozzle body 31 is protected from the collision of the corrosive gas and the obstacle in a wide range. , Can extend the life.

  By the way, in the said embodiment and Examples 1-4, although the welding affinity part 37 comprised with the material (for example, nickel) which is easy to weld the output window 41 to the general-purpose corrosion-resistant part 32 (for example, stainless steel) was demonstrated, HIP joining If the exit window 41 can be directly joined to the general-purpose corrosion-resistant part 32 and the heat conducting part 36 by the above, the welding affinity part 37 may not be used.

  Moreover, although the elevator 24 was demonstrated as an example of a drive part in the said embodiment and Examples 1-4, it is not limited to this, The emission part 2 of the sterilization target object, and emission of the electron beam irradiation nozzle 23 What is necessary is just to make it the state which irradiates the electron beam E to the inner surface of the sterilization target object while making the window 41 approach and separate and the said approach. Another example of the drive unit is a transporter that transports an object to be sterilized in a direction orthogonal to the longitudinal direction of the nozzle body 31 until the inner surface is irradiated with the electron beam E.

  Furthermore, in the said embodiment and Examples 1-4, in the inner surface electron beam irradiation apparatus 6, although demonstrated on the assumption that the longitudinal direction of the nozzle main body 31 is a perpendicular direction, it is not limited to this direction. These may be changed as necessary.

  In addition, as an example of the protection unit 51, the cap body 52 in the first embodiment, the coating 53 in the second embodiment, the outer peripheral pipe 54 and the inert gas supply 61 in the third embodiment, and the vent pipe 55 and the non-passage in the fourth embodiment. Although the active gas supply device 61 has been described, the protection unit 51 may be formed by appropriately combining these 52 to 55 and 61.

  Moreover, in the said Example 3 and 4, although shown in FIG. 6 so that the lower end of the outer periphery pipe | tube 54 and the vent pipe 55 may reach the lower end of the nozzle main body 31, this is only an example and the outer periphery pipe | tube 54 and the vent pipe 55 are shown. May not reach the lower end of the nozzle body 31. Since the outer peripheral pipe 54 and the vent pipe 55 replace the corrosive gas staying inside the PET bottle 1 with an inert gas, the lower ends of the outer peripheral pipe 54 and the vent pipe 55 are located inside the PET bottle 1. Any length is acceptable.

E electron beam 1 PET bottle 2 opening 3 electron beam sterilization equipment 4 transport device 5 outer surface electron beam irradiation device 6 inner surface electron beam irradiation device 7 reject device 8 ventilator 12 electron beam emitter 20 vacuum chamber 21 electron generation source 23 electron beam irradiation Nozzle 24 Elevator 31 Nozzle body 32 General purpose corrosion resistant part 33 Outer shell 34 Inner shell 35 Coolant 36 Heat conduction part 37 Welding affinity part 41 Exit window 51 Protective part 52 Cap body 53 Coating 54 Outer peripheral pipe 55 Ventilation pipe 61 Inert gas supplier

Claims (5)

An inner surface electron beam irradiation apparatus for sterilizing the inner surface of an object to be sterilized with an opening formed by electron beam irradiation,
An electron beam irradiation nozzle that irradiates the inner surface of the object to be sterilized with an electron beam is provided,
The electron beam irradiation nozzle has an emission window that emits an electron beam, a nozzle body that holds the emission window, and a protection unit that protects the nozzle body.
A drive unit is provided for bringing the opening of the sterilization object and the exit window of the electron beam irradiation nozzle closer to and away from each other, and for bringing the sterilization object to be irradiated with an electron beam on the inner surface during the approach. An inner surface electron beam irradiation apparatus characterized by that.   The inner surface electron beam irradiation apparatus according to claim 1, wherein the protection unit includes a cap body provided at a tip of the nozzle body.   The inner surface electron beam irradiation apparatus according to claim 1, wherein the protection unit has a coating on the nozzle body.   An inert gas supply unit for supplying an inert gas to the nozzle body, and an inert gas guide unit for guiding the inert gas supplied by the inert gas supply unit to discharge from the tip of the nozzle body. The inner surface electron beam irradiation apparatus according to any one of claims 1 to 3, wherein: An inner surface electron beam irradiation apparatus according to any one of claims 1 to 4,
A transport device for transporting an object to be sterilized to the inner surface electron beam irradiation device;
An electron beam sterilization facility comprising: an outer surface electron beam irradiation device for sterilizing an outer surface of an object to be sterilized conveyed by the conveying device by irradiation of an electron beam.

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