Determinación de perfiles de temperatura para el proceso de extrusión de polipropileno virgen y polipropileno reciclado”en el laboratorio de procesos industriales de la Facultad de Ciencias.

Abstract

The extrusión temperatura profiles of recycled polypropylene and the virgin polypropylene in the screw extruder machine werw determined in the Inndustrial Processes Laboratory of the Faculty of Sciences of the “Escuela Superior Politecnica de Chimborazo”.The mold was designed and implemented to obtain extruded polypropylene specimens measuring approximately 30cm by 3 cm. The optical sensors control the amount of minimum and maximum raw material to start the extrusion process wich requires 1 kg of load that easily enters having a suitable preheating stage to avoid problems of clogging in the engine.Drying was done in the stove at 60°C within30 minutes with a moisture content of 0.1 % because the polypropylene does not tend to absorb moisture easily because it passes throught the screw and breaks down any porous molecules but it does not do it in its whole. The feed in the hopper is done manually by the raw material (PP) in the extrusion stage,thus it ensures its respective feed,on wich the specimens are obtained with a thickness of 8mm in the mold,wich in the order perform test of traction,these are first cut and polished to accommodate parameters and chara teristics by the INEN 2043:95 standardthat says to have a thicknessof 3mm and length of 18cm minimum,the the most physical tests that ar of traction and reflection are performed,wich provide parameters of resistance,rupture,percentage elongation,with a maximum load of 694.15 N,a maximum effort of 22.48 MPa.it is determined the temperature is 180 °C-250°C,however in the set point of the same,it must enter screw temperature 180°C and tip temperature 250°C. It is recommended to implement a VDF frequency inverter,to control the tip temperature of the screw.