Recorded Wednesday, July 22st, at 2PM EDT Presented by Sun Plastech, INC.
Thermoplastics extrusion takes several related industrial forms – profile, sheet, compounding, jacketing, blown film, and extrusion blow molding to name a few – and each of these processes benefits from the use of Commercial Purging Compounds (CPCs) to improve efficiencies and drive down costs.
Continuous processes like extrusion are most profitable over very long production runs, so there is constant pressure for processors to avoid taking lines out of production unless absolutely necessary. Complex downstream equipment and processes only make the situation worse as the pressure to keep running increases. This typically results in carbon and color buildup on screws and in dies or die heads, often causing contamination, poor product quality, and unplanned downtime (and unhappy customers). During color changes, or to remove contamination, some processors will simply run vast amounts of virgin or regrind materials in an effort to return to production as quickly as possible. The problem with this approach, though, is that virgin resins are not designed to clean. If they were, you wouldn’t be in this situation in the first place!
Using Commercial Purging Compounds offer many benefits to extrusion processors, including: faster color and material changes, removal of stubborn carbon and color deposits, and diminished frequency of screw pulls equating to reductions in downtime and total costs. CPCs are engineered thermoplastic compounds that clean screws and tooling far more quickly and thoroughly than resins alone.
There are multiple types of purging compounds, but the market is dominated by two primary forms – mechanical and chemical. Their differences and benefits of each will be discussed.
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