This video is a Uniform heating of polyethylene cap by the INFRARED PANEL-HEATER.
Please check the following site for more information.
Related page:
Holing in the High Density Polyethylene－HDPE bottle by the Air Blow heater 
Uniform heating of EVA resin mat 
Uniform heating of Rubber sheet 
Uniform heating of Styrofoam sheet 
Uniform heating of Carbon fiber sheet 
Uniform heating of Printed Circuit Boards 
The heating demonstration of Holing Polyethylene bottle by the Air Blow Heater 
Uniform heating of Glass plate