RegrindMaterial

RegrindMaterial refers to plastic or polymer material that has been ground into smaller particles from scrap, sprues, runners, rejected parts, or post-consumer reclaim, and is then recycled into the production stream. Regrind is distinct from virgin resin, though it is commonly blended with virgin material to reduce material costs.

Properties vary by source and polymer type. Particle size, moisture content, contaminants, and color all influence processing behavior. Many polymers are hygroscopic and require drying before molding or extrusion. The thermal history of regrind can shorten molecular chains, potentially increasing melt flow and reducing mechanical performance if used at high proportions.

Processing and usage: Commonly fed into extrusion or injection molding as a blend with virgin resin. Typical usage ratios range from small percentages (5–20%) to more substantial shares (30–50%) for non-critical parts, depending on polymer and quality requirements. Equipment includes granulators, sorters, conveyors, and drying systems. Proper cleaning and sorting avoid contamination by metals, adhesives, labels, or coatings.

Advantages and challenges: Regrind reduces material costs and waste, lowers energy consumption, and supports circular economy goals. Challenges include inconsistent quality, color variation, contamination, and polymer degradation from heat and shear. Performance may degrade, particularly in high-strength or high-clarity applications.

Quality control: Manufacturers assess melt flow index, density, tensile properties, and color. Standards often specify maximum contamination levels and acceptable blend ratios. Regrind is most commonly used in non-structural parts, packaging components, or applications where aesthetic or critical performance is less demanding.