Keiji Ueno

Development of a plastic dosimeter for industrial use with high doses

Abstract We developed the new high dose plastic dosimeters using the phenomenon of hydrogen-chloride generation from PVC under irradiation, which indicates pH change in the color of a dye contained in the PVC.

The radiation crosslinking process and new products

Abstract In 1988 there were over 90 EB accelerators for industrial use in Japan. The number one industrial application was Wire and Cable, the 2nd was PE foam and Curing, and the 3rd was Precure of tyre. R & D has a very high ration of EB accelerator use. Low energy industrial applications were coated steel (white board), plaster slab, coated paper, magnetic tape and floppy disks. As a new application of the radiation crosslinking process, we have studied radiation crosslinking of engineering plastics and succeeded in improving the hea tresistivity without using glass fibers. Many kinds of polyfunctional monomers used as crosslinking reagents of irradiated Nylon and PBT were studied.

Radiation-crosslinked polyethylene for wire and cable applications

Abstract Polyethylene is used as an insulation material for wires and cables because of its excellent electrical properties. Polyethylene is also a typical irradiated crosslinked polymer. The characteristics of irradiated polyethylene, the effects of density, molecular weight and so on, were studied.

Development of halogen-free, heat-resistant, low-voltage wire for automotive use

Abstract Development of the electron beam irradiated halogen-free, heat-resistant, low-voltage wire for automotive use and its properties are discussed in this short report.

IRRADIATED CROSS-LINKED WIRE

Abstract Generally speaking, polyurethane has excellent mechanical properties but poor water resistance. It is rather difficult to obtain flame retardant polyurethane while maintaining water resistance. We ascertained that improvement in water resistance could be achieved on polyurethane by high energy electron beam irradiation. The irradiated cross-linked polyurethane is very useful as jacketing material for automobile cables.