Plastics Technology

APR 2017

Plastics Technology - Dedicated to improving Plastics Processing.

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If the mold halves are not parallel, the leader-pin bushings, interlocks, and any cam or cavity shut-offs can wear prematurely. Complete Blown Film THE X -DIE & High Performance V -RING www.halpine.com T: (508) 655-1123 F: (508) 655-9337 ALPINE AMERICAN T H E B L O W N F I L M E X P E R T S Most of the damage caused by locating rings is at or near the platen's alignment hole. engaged in the platen orifice, it can be very helpful for a second setup person to stand at the back of the machine or use a step stool to be able to see the top of the mold. Regardless of what caused these dents in the platens, any raised or protruding areas should be repaired immediately so as not to effect the mold's parallelism. If the mold halves are not parallel, the leader-pin bushings, interlocks, and any cam or cavity shut- offs can wear prematurely. A 12-in.-long × 2.5-in.-wide aluminum oxide sharpening stone with an oil-based lubricant works very well at removing any high spots. The molding supervisor should show any platen damage to the setup men and explain that just because these giant blocks of steel look indestructible, they obviously are not. They need to be more careful when hanging the molds. If they don't seem to get it, intro- duce them to that sharpening stone. ABOUT THE AUTHOR: Jim Fattori is a third- generation injection molder with more than 40 years of molding experience. He is the founder of Injection Mold Consulting LLC, and is also a project engineer for a large, multi-plant molder in New Jersey. Contact jim@injectionmoldconsulting.com; injectionmoldconsulting.com. 40 APRIL 2017 Plastics Technology PTonline.com T O O L I N G K now How

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