Manufacturers utilizing both post-consumer resins(PCRs)and virgin resins often have difficulty producing a homogenous materials mix.The ability to obtain a homogeneous PCR/virgin mix is affected by such PCR materials characteristics as varying melt points,viscosity levels,densities,and form(flake or pellet).An often overlooked remedy to a poor materials mix is to change the screw design of the machine being used in product manufacture.Optimizing the screw design for use with PCR materials enables manufacturers to obtain consistent processing characteristics and contributes to maximizing material properties.This may result in improved output,increased recycled content,or better performance properties.This technology brief provides background information on plastics processing screws and highlights the important points to consider when evaluating screw design for use with PCR materials.
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