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After seeing Dyna–Purge at a plastics industry trade show, David Tall of Alpha Rho requested a trial sample of the purging compound for testing. Now used for the company’s 12 injection molding machines, Dyna–Purge has reduced downtime by 67% and the cost to purge by 50%.
Alpha Rho produces a wide assortment of clear and colored boxes and containers used for packaging, display, storage, and organizing. Using Dyna–Purge to help ensure the integrity of its products is critical to the company and its customers.
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Problem:
Founded in 1965, Alpha Rho is a leading manufacturer of rigid plastic boxes and other containers for the consumer market.
Molded from GPPS, the boxes are offered in clear and in a variety of translucent and opaque colors.
In order to purge for color changes, the company would run its own regrind through the barrel and screw of its 350–ton IMPCO injection molding machine.
The barrel temperature operates at 400°F to 430°F.
Chemical compounds and liquid purging agents used previously proved cumbersome to prepare and work with, so the company continued using in–house regrinds for purging.
Depending on the screw size (up to 32 oz.), 25 to 50 lbs. of regrind would be required, and it would take approximately one hour to purge and post-purge the entire system thoroughly.
The calculated cost to purge for every color change was $60 in lost production, material and labor.
Solution:
Use 2 lbs. of Dyna–Purge C, a grade specifically designed for purging transparent resins from injection molding or extrusion equipment at 400°F to 590°F.
Results:
- Machine downtime is reduced 67% as Alpha Rho is able to purge and post–purge the entire system in only 20 minutes.
- Since the cost to purge is only $30 using Dyna–Purge C, Alpha Rho reduced its purging costs by 50%.
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