By Rolf Klein
This can be the 1st specified description in English of radiation and polymeric fabric interplay and the impacts of thermal and optical fabric houses. As such, it presents entire details on fabric and technique features in addition to purposes relating to plastic laser welding. the 1st a part of this sensible e-book introduces the constitution and actual houses of plastics, sooner than discussing the interplay of fabric and radiation within the NIR and IR spectral diversity. this is often through an summary of the actual foundations of laser radiation and laser resources used for plastic welding. The 3rd half describes the most techniques of laser welding thermoplastics, in addition to probabilities of approach regulate, layout of joint geometry, fabric compatibilities and version of absorption of plastics to NIR radiation. ultimately, the writer explains purposes of laser welding plastics utilizing a number of business case reports from the automobile undefined, family items, and clinical units. adapted to the wishes of every body facing laser welding of plastics, particularly engineers in packaging, part production, and the clinical undefined.
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Additional resources for Laser Welding of Plastics: Materials, Processes and Industrial Applications
Example text
If the material completely plasticizes the decrease of the specific density is again quasilinear. 31 Temperature conductivity as function of the temperature for some semicrystalline thermoplastics [11]. 31) caused by the superposition of the given effects. The temperature conductivity decreases on increasing temperature during the state of application and has a discontinuity at the crystallite melt temperature. Exceeding the crystallite melt temperature the temperature conductivity increases quasilinearly by increasing temperature.
The acoustic mode of the oscillation will be described by Debyes approach and the optical mode by Einsteins approach [26, 27]. Consideration of the heat capacity at constant volume cv enables a theoretical determination of molecule chain oscillations induced by acoustic or optical waves, related with the heat capacity. In contrast to the heat capacity at constant pressure cp, the heat capacity cv cannot be measured, however. Therefore, for computation of temperature distributions in the material by numerical or analytical computer simulation the heat capacity cp is of practical importance.
1 Amorphous Thermoplastics . . Heat conductivity shows a gentle rise with increasing temperature. Heat capacity increases on rising temperature. At the glass-transition temperature the increase is more distinctive. Specific density decreases slowly below the glass-transition temperature. Exceeding the glass-transition temperature the decrease is more intensive with increasing temperature. 30 Temperature conductivity as a function of the temperature for some amorphous thermoplastics [11]. The superposition of these effects results in a slow decrease of the temperature conductivity in the state of application by increasing temperature.