 "A
much simpler, and less expensive way to shorten residence time is
with a volume reduction screw," says Randy Conner, president
of Concor Tool & Machine, Inc., Hayward, WI, a firm specializing
in molding machine screws, barrels and components. To cut residence
time, Concor makes a new screw with less plasticating area. They
do this by making the screw flights wider, thereby reducing throughput.
Since the reduced volume screw has the same overall dimensions as
the original, it can be used without any other component changes.
Conner says he has reduced the volume by as much as 60% on screws
for many types of thermoplastics. Cost is a small percentage over
that of a standard screw. He emphasizes that the modified screw
will have the compression ratio and other geometry recommended for
processing the material. |
