Pelletizers | machinery feature
effi ciency as a result of improved pellet quality and uniformity.
“It is not a material of any kind that insulates the die,
rather, it is an insulating cavity designed in the style of a double- or triple-pane of glass,” says John Roberts, director of sales and marketing at Gala Industries in Eagle Rock, Virginia. “The cavity within the die provides the insulation from the water and will not rob the heat from the die-plate.” The cavity design also minimizes pressure drop
while maintaining a uniform temperature on the heated side of the die-plate, reducing the potential of polymer solidifi cation in the die face. The trick is to make the die-plate robust and fl exible enough to handle the constant thermal cycle that a die-plate goes through and not destroy the insulation properties or the integrity of the die-plate for long- term performance. Gala says that its conventional die-plate designs can
process most grades of highly engineered materials, but the Heat Flux die-plate opens an entirely new arena of engineered materials and generally higher-tempera- ture or high-performance material formulations to its pelletizers.
The company has also launched a new fully automated underwater pelletizing unit that processes a wide range of materials at rates up to 15,000 kg/h while maximizing blade and die face life. Its
Electronically Adjustable Pelletizer (EAC) joins
Gala’s line of automated, spring-loaded and manually adjustable underwater
pelletizers. It features a servo stepper motor that is positioned, adjusted and monitored by PLC.
The cutter blades can be positioned in increments
down to less than 0.001 inch (0.025 mm). “We know, through the use of pelletizer automation and monitor- ing, that spinning cutter blades in an underwater pelletizer are subject to a force that can draw the blade into the die face, potentially increasing blade and die face wear on certain applications,” says Roberts. “A processor might assume that they have to push the
The Heat Flux die-plate from Gala can handle temperature- sensitive
materials more effi ciently
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