Injection Molding Machines and Equipment
It is difficult for the average person to grasp the concept of how different
it is to make a first shot figure from injection molded plastic than it is
to make a urethane hard copy unless he knows what kind of equipment is
involved in the former. Injection molding required a steel mold that will
withstand tremendous pressure and heat involved in "shooting" or injecting
molten plastic. Molding machines are big and heavy and their capacity is
measured in tonnage. This describes the force that will hold the two halves
of the mold together as the plastic is being shot into it. A 30 Ton press
is relatively small and ones going up to 200 tons are not uncommon. That's
a heck of a lot of force, folks! Many production molding machines are
about 6 feet tall, 5 feet wide, and 12 feet long so you can guess that
something of this magnitude isn't within the grasp of your average
bootlegger. In addition to the machine itself, other equipment is involved
such as dryers, regrinders, forklifts and hoists. The plastic material
itself is also a huge part of the process. Plastic is sold in 1000 pound
boxes and is nothing more than tiny pellets that look like very short bits
of spaghetti. You need a hoist to get the mold into the machine because
those things weigh several hundred pounds. The dryer uses a vacuum to suck
the pellets from the box and move them into its hopper. The plastic will
stay in the hopper for a pre-determined time in order to remove all moisture
from the "virgin" material. Moisture in the plastic is a no-no in molding
as the steam produced can cause major pressure (explosion, spattering,
popping) problems.
Description: Chris Georgoulias