June 29, 2022
Electron Beam Processing Systems (EPS)
Electron Beam Processing Systems (EPS)

Summary:-

Electron beam machining, or electron beam irradiation (EBI), is a process that typically uses high-energy electrons to machine objects for a variety of purposes. This can occur at high temperatures and in nitrogen atmospheres. Potential uses for electron beam irradiation include sterilization and crosslinking of polymers.

Electron energies typically range from keV to MeV depending on the required penetration depth. The radiation dose is usually measured in Gray, but also in Mrad (1 Gy corresponds to 100 rad). The basic components of a typical electron beam processing unit are: an electron gun (consisting of a cathode, grid and anode) used to generate and accelerate the primary beam; A magneto-optical (focusing and deflecting) system used to control the way an electron beam strikes the material to be machined (“workpiece”). In operation, the overall cathode is a heat source that radiates electrons that are formed into a parallel beam and accelerated by the electrostatic field geometry set by the overall electrode configuration (grid and anode) used.

The electron beam then exits the gun assembly through the exit hole of the ground plane anode with an energy equal to the value of the negative high voltage (total working voltage) applied to the cathode. The direct use of high voltages to generate high-energy electron beams can convert input power to beam power with efficiencies in excess of 95%, making electron beam materials processing a very energy-efficient technique. After exiting the gun, the beam passes through an electromagnetic lens and a system of deflection coils. A lens is used to focus a workpiece or create an angled beam spot, while a deflection coil is used to position the beam spot in a fixed position or provide some sort of oscillating motion.

In polymers, electron beams can be used in materials to induce effects such as chain scission (making polymer chains shorter) and crosslinking. The result is a change in the properties of the polymer to expand the material’s range of applications. The effects of irradiation can include changes in crystallinity as well as microstructure. Typically, the irradiation process degrades the polymer. Irradiated polymers can sometimes be characterized using DSC, XRD, FTIR, or SEM. High-energy electron irradiation in poly(vinylidene fluoride-trifluoroethylene) copolymer lowers the energy barrier for the ferroelectric-paraelectric phase transition and reduces polarization hysteresis loss. Ingredient.

E-beam treatment involves irradiating (processing) products with high-energy electron beam accelerators. Electron beam accelerators use on-off technology and their general design is similar to that of cathode ray televisions.