A purging compound is a specialized resin-based product designed to clean thermoplastic processing machinery, including injection molding machines, extruders, and blow molding machines. Its primary purpose is to remove residual plastic material, color contamination, carbonized material (black specks), and degraded polymer from the barrel, screw, nozzle, hot runner systems, and dies of these machines. The use of a purging compound is critical for maintaining product quality, reducing scrap rates, and minimizing downtime during material or color changes, or before machine shutdowns.
Purging compounds typically consist of a base resin blended with proprietary additives that facilitate cleaning. These additives can include abrasive components that mechanically scrub the machine surfaces, chemical agents that break down degraded polymer and carbon deposits, or a combination of both. The compound is run through the processing equipment at specific temperatures and pressures, effectively "sweeping" out contaminants and leaving the machine clean for the next production run.
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The application of purging compounds is essential in various scenarios within plastic manufacturing. They are indispensable for quick and efficient color changes, preventing streaking or specking of the new product with remnants of the previous color. During material changes, especially when switching between incompatible polymers or those with different melt temperatures, purging compounds ensure thorough removal of the old material to prevent contamination and defects.
Furthermore, purging compounds are vital for preventative maintenance. Regular use before planned shutdowns can prevent material degradation and carbon buildup during cooling, making startups smoother and reducing scrap. They can also significantly reduce the need for manual screw pulls and cleanings, which are time-consuming and costly. The market offers various types of purging compounds tailored for different processing temperatures, resins (commodity to engineering plastics), and specific cleaning challenges, ensuring optimal performance and efficiency in thermoplastic production.