Experimental Analysis on Structure Formation in Tubular Film Blowing Process
Hiroshi Ito, Ken-ichi Suzuki, Takeshi Kikutani, Ho-Jong Kang
Tokyo Institute of Technology
JAPAN

Keywords: on-line measurements , birefringence, Film blowing

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In order to clarify the mechanism of structure development in tubular film blowing process, on-line measurements of velocity, bubble diameter, and birefringence were performed during the tubular film extrusion of polypropylene at various take-up ratios (TURs) and blow-up ratios (BURs). The effects processing conditions on the development of molecular orientation and crystallization
were investigated