By Jiri George Drobny
The economic use of ultraviolet (UV) and electron beam (EB) radiation is starting to be speedily and now penetrates an ever-widening variety of functions, together with electronics, printing, packaging. assets and references for pro pros abound, yet few successfully introduce the sphere to beginners or offer speedy entry to specifics on UV and EB results on specific fabrics. This e-book does both.Radiation know-how for Polymers systematically offers the sensible points of utilizing UV and EB radiation to regard polymeric fabrics. Drawing on greater than 30 years of engineering event in polymer processing, the writer describes the creation and houses of UV and EB strength, explores tactics linked to either kinds of radiation, and gives an in depth evaluate in their functions. He concludes with a glance at contemporary advancements and rising tendencies in apparatus, chemistry, and technologies.Whether you're an engineer or scientist new to radiation expertise or a product or approach fashion designer gaining knowledge of the consequences of radiation on a selected fabric, Radiation know-how for Polymers is where commence your look for info. It deals a whole assessment of the expertise and offers priceless path to assets of extra particular, specified information.
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The higher surface dose produces a higher concentration of radicals, which in turn reduces the oxygen inhibition. 5 µm-thick silica ceramic window or a 5–10 µm titanium window as the beam exit. Such electron beam tubes or bulbs are capable of operating at 50 to 150 kV,64,67-71 and can be stacked into modules to cure wide webs. It is conceivable that a miniature electron beam could provide an efficient low-cost means to cure thin coatings, adhesives (clear and filled) and inks. 22. 22 Low voltage electron beam processor; (left) emitter (right) power supply.
The light generated by the lamp is reflected by a reflector that can either focus or defocus it, depending on the process. The lamp performance, which affects cure, is expressed by the following characteristics:2 • UV Irradiance is the radiant power arriving at a surface per unit area, most commonly expressed in W/cm2. It varies with lamp output power, efficiency, the focus of its reflector system and its distance to the surface. The intense peak of focused power directly under the lamp is referred to as peak irradiance.
Long filaments set parallel to the web direction eliminates the problem of filament support and adjustment of the single-filament design. The filaments are mounted between two rigid bars that determine the length of the filament assembly. A control and screen grid defines the electron optical extraction conditions for each filament into a single gap. The overlapped beams emitted from adjacent cathode filaments form a uniform electron cloud before the acceleration takes place. 1 Single Stage Scanned Beam Accelerator The accelerator for the electron beam processor produced by Electron CrossLinking AB in Halmstadt, Sweden (originally developed by Polymer Physik) uses a classical triode system comprising an electron gun, a single electrode gap, and a beam-focusing and -deflection system.