JPS63185444A - Electron beam irradiation device - Google Patents

Abstract

PURPOSE:To enable the heat treatment or drying treatment before and/or after the irradiation of an electron beam by providing an irradiation part in a box body, and further furnishing a heater to form a self-shielding electron beam irradiation device. CONSTITUTION:The low-energy type electron beam irradiation device is arranged at the irradiation part 1, and an electron beam is projected on a body 13 to be irradiated through an irradiation window 5. The box body 2 consists of an irradiation chamber 8 and a passage 9 for the body 13, a lead sheet, etc., are stuck on the inner wall of the box body 2, and the passage 9 is bent and extended from the irradiation chamber 8 to complete the shielding. The irradiation chamber 8 is positioned under the irradiation window 5, and an inert gas supply port 6 and a discharge port 6' are provided. A shielding plate 7 extending from the upper end to the lower part and a shielding plate 7' extending from the lower end to the upper part are furnished respectively at the inlet and outlet of the window 5 to the extent that the movement of the body 13 is not disturbed, and the shielding is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention is a self-shielding electron beam irradiation device, more specifically, it has a heating section in addition to the irradiation section, thereby eliminating the need to separately install a heating dryer in the production line. The present invention relates to a secondary X-ray self-shielding electron beam irradiation device that can perform a variety of crosslinking and film hardening.

Background of the Invention In recent years, with the development of low-energy and compact self-shielding electron beam irradiation equipment that can easily shield secondary X-rays, electron beam irradiation technology has been applied to hardening liquid resins in coating, printing, lamination, etc. Significant progress has been made in the field of thin layer surface processing.

Generally, the liquid resin is cured by coating a base material with a thin layer of resin mainly composed of reactive monomers or reactive oligomers to form a film, and then irradiating it with an electron beam to cause polymerization mainly through a radical reaction. This is done by raising and curing. This electron beam curing method differs from the conventional general method in which a coating composition containing an organic solvent is applied, then heat-dried to volatilize and remove the solvent, and then heat-cured. -Since it can be cured, it is attracting attention along with the UV curing method from the perspective of pollution control, and from the perspective of energy saving because it does not require a heating dryer.

However, if the reactive monomer or reactive oligomer has high viscosity or high surface tension, coating after unwinding is often difficult. In such a situation, it is easier to improve coating properties by adding a small amount of organic solvent than by changing the composition of the monomer/oligomer itself. Therefore, ideally it would be done with a non-solvent system, but in reality it may be coated with a system containing a small amount of organic solvent, the solvent removed, and then cured, and in rare cases, the solvent may be removed. In some cases, electron beam irradiation is performed without further step, and then the solvent is removed.

In the above case, a heating dryer is required between the coater and the electron beam irradiation section or between the electron beam irradiation section and the winder. In addition, for example, in a non-solvent system, a heating device may be required in order to perform heat treatment to accelerate the curing reaction before electron beam irradiation. In cases where these heating devices are required, conventionally it has been usual to separately install heating drying devices before and after the electron beam irradiation device.

Problems to be Solved by the Invention One of the original major characteristics of the electron beam curing method is that it requires less installation space. The lines become long and the original characteristics are lost. Furthermore, the separate installation is disadvantageous in terms of equipment cost.

Means for Solving the Problems The present invention has been made in view of the above circumstances, and provides a self-shielding electron beam irradiation device characterized in that a heating device is attached inside the box.

The conventional electron beam irradiation unit itself can be used.

For example, electrons are emitted in one step in a vacuum chamber between an area beam type, curtain beam type, or broad beam type electron gun and an irradiation window made of titanium foil or aluminum foil, which has good electron transparency and excellent heat resistance. There is a non-scanning type that accelerates and emits electrons from the irradiation window to irradiate the object to be irradiated. The accelerating voltage is approximately 500 KV or less, which belongs to the so-called low-energy region, and the secondary X-rays generated by irradiating the irradiated object can be easily dissipated relatively quickly, and it is considered a self-shielding type. Ru.

Regarding self-shielding, in addition to shielding the irradiation chamber and vacuum chamber with lead plates or steel plates, in order to eliminate the leakage of secondary The box extends from the entrance and exit of the irradiation chamber to both sides, and has a bent structure so that the entrance of the box, the irradiation chamber, and the exit of the box are not on the same plane.

In the present invention, a heating device is attached to the inside of the box between the box population and the irradiation chamber and/or between the irradiation chamber and the box outlet, and heating and/or drying is performed before and/or after irradiation. can be processed. The heating device attached to the box body may be of any type as long as it is thin enough to ensure a passage for the irradiated object, such as a hot air nozzle type, a panel heater type, or a type that the present inventors have developed for practical use. A flat plate type hot air nozzle system using a porous material, which has been applied for new patent registration (Utility Application No. 185503/1983), can be used.

In addition, in the irradiation chamber, a supply/discharge port is provided to supply and dispose of inert gas (usually nitrogen) in order to eliminate oxygen that inhibits radical reactions. Alternatively, the heating device may be used to blow heated inert gas such as nitrogen gas or carbon dioxide instead of heated air, thereby omitting the blowing of the inert gas in the irradiation chamber. Note that it is of course possible to use the blowing of inert gas from the heating device as an auxiliary means to complete the blowing in the irradiation chamber.

Below, the self-shielding electron beam irradiation device of the present invention will be explained in more detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing one embodiment of the device of the present invention, and FIG. 2 is a sectional view of the device of FIG. 1. The apparatus of the present invention consists of an irradiation part l and a box body 2. A low-energy type electron beam irradiation device as described above is arranged in the irradiation section, and the object 13 to be irradiated is irradiated with the electron beam through the irradiation window 5 .

The box body 2 consists of an irradiation chamber 8 and a passage 9 for the irradiated object. A lead plate or the like is pasted on the inner wall of the box body, and the passage extends in a curved manner from the irradiation chamber to complete shielding.

The irradiation chamber is located below the irradiation window, and the inert gas supply port 6
and a waste port 6. A shielding plate 7 extending downward from the upper end and a shielding plate 7' extending upward from the lower end are provided at the entrance and exit of the irradiation chamber to an extent that does not impede the movement of the irradiated object, thereby making the shielding more complete.

The passage has an inlet 3 and an outlet 4, and guide rolls 1O are arranged at intervals in an arch shape at the bottom, over which the object to be irradiated passes. A heating device 11 having a flat hot air nozzle is disposed at the upper part of the artificial passage, and hot air is supplied toward the irradiated object.

After the hot air gives heat to the air in the passage space and the irradiated object,
Air is exhausted from the waste port 12.

To operate this device, for example, when coating a film, the film is unwound from an unwinder using a conventional method, and a coating composition containing a small amount of organic solvent is applied to the film at a constant thickness using a coater. The material is then supplied to the inlet of the apparatus, the organic solvent is volatilized in the inlet passage, electron beam curing is performed in the irradiation section, and the material is taken out from the outlet and wound up.

Although the case where the coating composition contains a small amount of organic solvent has been described, the present invention can also be applied to a case where the coating composition contains a small amount of water as a special case. In addition, the apparatus of the present invention is applicable not only to the curing of resin films on substrates but also to crosslinking of plastic films, etc., to which low-energy type electron beam irradiation can be applied.

Effects of the Invention By using the apparatus of the present invention, it becomes possible to perform heat treatment and drying treatment before and/or after irradiation, without installing a separate heating dryer in the production line as in the past. It requires less space and equipment costs can be kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the device of the present invention, and FIG. 2 is a sectional view of the device of FIG. 1. The main symbols in the drawing are as follows.

Claims (1)

[Claims] (1) A self-shielding electron beam irradiation device having an irradiation section inside a box, characterized in that a heating device is attached inside the box.