One of the most common methods of film manufacture is Blown Film (also referred to as the Tubular Film) Extrusion. The process involves extrusion of a plastic through a circular die, followed by "bubble-like" expansion. The principal advantages of manufacturing film by this process include the ability to:
- Produce tubing (both flat and gussetted) in a single operation
- Regulation of film width and thichness by control of the volume of air in the bubble, the output of the extruder and the speed of the haul-off
- Eliminate end effects such as edge bead trim and non uniform temperature that can result from flat die film extrusion
- Capability of biaxial orientation (allowing uniformity of mechanical properties)
- Blown Film Extrusion can be used for the manufacture of co-extruded, multi-layer films for high barrier applications such as food packaging.
Adding CaCO3 into original polymer formulations is the most economical way to improve the properties of LDPE, LLDPE and HDPE films and sheeting.
The following product benefits will be achieved with PE compound:
- Higher blocking and slip resistance.
- Greater tensile strength of film after stretching.
- Improved mated surface for printing.
- “Food Contact Use” compliance due to absence of toxic components.
- Higher quality of folding and creasing.