ABSTRACT
The processes for making films that will be discussed in this chapter transform solid polymer resins in granular or pellet form into films on rolls. The first part of the transformation is the extrusion sequence, which consists of the following steps:
Polymer Feeding —> Melting-Mixing —• Metering--Filtration All extruded polymers must go through the complete sequence, and variations in each step to accommodate differences in polymer characteristics are relatively subtle. Therefore the description of these steps will be general with an emphasis on fundamentals.
