It is desired to make thin, clear polypropylene films by blow extrusion. The process uses a screw extruder to melt the polymer (Tm = 175 oC) and eject it out of a ring-shaped die pointed upwards. A jet of air at 90 oC and an absolute pressure of 1.1 atm is used to stretch the polymer, which is collected by rollers placed 6 inches above the die. After the rollers, the film continues another 1 foot before being immediately spun onto a spool (for storage and shipment).

The company has found three major problems with the polypropylene films: (1) the films tend to be opaque rather than clear, (2) the spooled film is sticky and difficult to roll out to thin sheets, and (3) the films are lumpy (the thickness is variable rather than uniform).

List/discuss THREE suggestions that will help solve these problems.