Hello and welcome to a new post in which we discuss the usage of regrind when processing the high-performance Polyarylamide (PARA; MXD-6).
Recycling Process:
Polyarylamide regrind (sprues, runners, etc.), containing reinforcements such as glass fibers, can be recycled with virgin PARA compound. Important is to exclude any contamination such as oil, release agents, and other additives.
Impact on Mechanical Properties and Color Variation:
Several studies and experiments have shown [1] that a split of 70/30 (70 wt% virgin PARA / 30 wt% regrind) is preferred. The compound used in each cycle was 70% virgin compound (containing 50 wt% glass fibers) mixed with 30% regrind from the preceding cycle. Very little change was observed in the mechanical properties (tensile strength, elongation at break) after recycling. Successive recycling may cause a slight change in color.
Recommendations:
Important is to confirm the recycling rate experimentally to ensure the finished part meets specifications. Also, drying the regrind prior to injection unless directly grinded and reinjected at the moulding machine. Mark parts to facilitate after-use recycling (check out the part marking codes here).
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