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Case history: Switch to purging compounds saves money

An injection molder producing the Flyer aerodynamic disk reduced its purging costs by more than 50% when it switched to commercial purging compounds, according to a report published by Shuman Plastic...


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September 1, 2002 by Canadian Plastics


An injection molder producing the Flyer aerodynamic disk reduced its purging costs by more than 50% when it switched to commercial purging compounds, according to a report published by Shuman Plastics, Inc. Aakron Rule had been using polypropylene to purge for every color change on a 375-ton injection molding machine with a two-cavity hot runner system. The calculated cost to purge was $237, incorporating lost production, labor time, materials and defective products. Color changes would take about two hours and result in 400 to 500 substandard parts produced before normal production resumed.

After switching to Shuman’s Dyna Purge P, color changes now take only 30 minutes — a 75% reduction. The cost to purge decreased to $110, yielding an annualized savings of approximately $6,320 for the processor, the report notes.

Shuman Plastics, Inc. 416-283-2427