Investigation into the cooling characteristics of blown film extrusion lines

To analyze and to optimize the cooling conditions at blown film extrusion l ines, the cooling air stream has been determined by using a hot wire anemom eter. The velocity and temperature profiles of the air stream and the air p ressure along the bubble have been measured. During film extrusion the sign ificant process parameters and the cooling air ring geometry have been vari ed. The goal of these studies is to gain a theoretical description of the cooli ng air stream. Therefore, the experimental results represent a good basis f or developing and checking the results of such a model.