LUCOBIT RESINS AND THEIR USE
IN BLOWN & CAST FILM APPLICATIONS
The most widely used method for film extrusion is the tubular or blown film technology which accounts for about 85 % of all film production. Cast film extrusion is the other major process and accounts for about 10-12 % of all polyethylene film production. Blown film generally has a better balance of mechanical properties than cast or extruded films because it is drawn in both the transverse and machine directions. The nearly uniform properties in both directions allow for maximum toughness in the film.
Cast film has a more effective cooling process than blown film resulting in less haze and better gloss. In addition, the cast film has a thickness variation of only 1 to 2 % versus the 3 to 4 % for blown film.