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Preventing contamination and resin purging residue is critical for plastics processing companies as it can lead to unsellable products and costly production downtime. Using the right purging compound and purging process can reduce or eliminate contamination, scrap rates, and downtime. Here are three easy ways to prevent residue and contamination during resin transitions:
Purging compound selection plays a significant role in avoiding contamination during production. Use the appropriate purging compound grade based on the melt index (MI) of your resins.
A low-residue purging compound is ideal for high-MI resins. If contamination exists, use a glass-filled purging compound (for screw and barrel only) grade before the low-residue grade.
Using the recommended temperature range for your purging compound and resin is crucial to ensuring a successful purging process.
To prevent residue from building up during the purging process, it's essential to use a purging compound that's designed to work at the recommended temperature range for your resin. Make sure to use a purging compound designed explicitly for your resin's temperature range, such as a low-temperature purging compound for PVC.
When changing production resins, residue issues can be minimised by taking assertive steps. Increase screw speed and back pressure to their highest safe levels to fully displace purging compound residue. These techniques are especially effective for resins like Bayer’s Texin, Desmopan (TPU), and Makrolon (PC). Minimise residue by taking these simple yet effective steps:
Efficiently switch between colours on one machine by using the right purging procedures. Prevent residue issues, eliminate contamination, and increase machine capacity with the cleaning power of a proper purging compound and process. Experience a significant reduction in scrap rates with easy-to-follow purging procedures.
Request a free sample of ASACLEAN purging compound and see how it can prevent residue-related contamination and downtime.