Comparison of mechanical properties of extruded blown and cast polypropylene-1-pentene thin film.
László Halász, Károly Belina, Olof Vorster, Ioan Tincul
Technikon Pretoria
Hungary

Keywords: blown film , cast film, propylene copolymer

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Thin monolayer films of Ziegler-Natta catalyst ethylene-propylene and 1-pentene-propylene copolymers were produced from a 45 mm Reifenhauser extruder through a 65 mm diameter blown film die and 600 mm cast film die by using the same die gap on each die to achieve equal drawn down ratios.
Yield strength (ASTMD 882), tensile strength at break (ASTMD 882), tear streangth (ASTMD 1922) haze and gloss (ASTMD 1023) in both machine and transverse directions were determined.
Investigating the effect of 1-pentene content, the smaller amount of 1-penten is advantageous from the point of view of mechanical and optical properties. The blown and cast films show similar mechanical properties, but the optical properties are better in the case of cast films. The 1-pentene-propylene copolymer film has a better optical properties than