CHERRY HILL, N.J. - A New Jersey company claims it has developed a way to cool extruded plastic products more quickly by adding small amounts of water within a vacuum sizer. That process reduces the length of the sizer to inches rather than feet. It takes advantage of the heat of evaporation, which allows the removal of 540 calories per cubic centimeter of water, according to Extrusion Die Technologies Inc. of Cherry Hill. Heat transfer in water or conduction through a metal surface yields 1 calorie/cc of water.
Extrusion Die Technologies said this type of sizing requires a liquid ring vacuum pump. The Corona Pumps Division of E.R. Mitchell Co Inc. of Winslow, N.J., supplies a vacuum sizing stand for the process.