Recycled Cellulose Polypropylene Composite Feedstocks for Material Extrusion Additive Manufacturing. According to ACS publications,” Many types of consumer-grade packaging can be used in material extrusion additive manufacturing processes, providing a high-value output for waste plastics. However, many of these plastics have reduced mechanical properties and increased warpage/shrinkage compared to those commonly used in three-dimensional (3D) printing. Recycled polypropylene/waste paper, cardboard, and wood flour composites were made using a solid-state shear pulverization process.”
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