COLD CALCULATIONS

24/04/2017
Canadian Plastics

COLD CALCULATIONS

If you think choosing a chilling system comes down to cost, capacity, and performance capabilities, you’re only half right. The resins you’ll be processing give up heat at different rates, which means you’d better be taking them into account, too.

In everything from romantic relationships to pumping gas, compatibility is critical. If a cat lover hooks up with a feline fur allergy sufferer, for example, bet on a quick breakup; likewise you won’t get far by putting diesel fuel into a non-diesel vehicle. It’s a law that extends even to selecting the best cooling system for your plastics processing needs. Plastics part makers face an important choice when determining how best to cool their equipment: use a central cooling system, or use portable chillers that serve specific machines or manufacturing cells. There’s a variety of factors to take into account when deciding — cost, capacity, performance capabilities — but one consideration tends to get overlooked: the types of resins being processed. 

To the uninitiated, calculating the various heat loads of common resins, and therefore the detailed process load calculations, can seem as complicated as a NASA formulation. The good news is, it’s all been done for you. “The cooling system industry has developed timesaving guidelines — we call them cookbook formulas — that simplify the process of estimating heat loads,” said Ziggy Wiebe, owner of Chillers Inc. But that doesn’t mean you don’t still have a decision to make: specifically, the choice between a central cooling system and portable chillers mentioned above. “Knowing what the resin is only tells us what the heat load is,” said Giorgio Santella, chief marketing officer with Piovan S.p.A. “After that, deciding between portable and central systems has nothing to do with the material — it has to do with the unique situation of a molding facility, and each one is different.”

 

Read the complete article published on Canadian Plastics.