Abstract
The produced mechanical work at tensile drawing is converted into heat almost completely and the polymer temperature rises. The temperature rise at adiabatic drawing for different polymers is 20-100°C. To determine the temperature of PET during neck propagation, micro-particles with pre-determined melt surface were dusted on the sample surface. If particles melted, surface temperature exceeded the particle melt temperature. In addition, the temperature rise was analyzed theoretically. The surface temperature of 140°С of PET film samples was recorded. Equations describing distribution of temperature are derived. The equations are solved for steady neck propagation. The drawing ratio in the neck and the draw stress are the main parameters determining the temperature rise. A new method of measurement of the heat transfer coefficient from the neck temperature profile is developed. When the temperature in the yield zone reaches the glass transition temperature, appear pores, the neck drawing ratio increases, and further temperature rises are observed.
Highlights
The produced mechanical work at tensile drawing is converted into heat almost completely and the polymer temperature rises
It may be performed at elevated temperatures lower than the glass transition temperature
The temperature of the polyethylene terephthalate (PET) film in the neck was measured in room conditions at a drawing rate of 1,000 mm/min as described in the ‘Methods’ section
Summary
The produced mechanical work at tensile drawing is converted into heat almost completely and the polymer temperature rises. The temperature rise at adiabatic drawing for different polymers is 20-100°C. If drawing occurs without application of external heat, the process is called cold drawing. Drawing is often done at room temperature and called a cold drawing. It may be performed at elevated temperatures lower than the glass transition temperature. Eventually it grows in length without further change of depth. Upon the passage of this zone through a region, the material in that region is taken from the state of low stretch to the state of high stretch
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Mechanical and Materials Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
