Year-end Sale % OFF 
Abstract
This chapter describes a unique use of existing quality control (QC)-measured resin properties to predict relative molding cycle times for high-flow polyethylene (PE) resins. A resin manufacturer changes polymerization catalyst systems, modifies reactor configuration, or adjusts reactor-operating parameters such as temperature, ethylene, and hydrogen concentrations to vary molecular weight (MW) and molecular weight distribution (MWD). Melt index is measured in the QC lab and is used as an indication of resin molecular weight. It is defined as the number of grams of polymer extruded in ten minutes as measured by ASTM Method D1238. The higher melt index results in the lower molecular weight and melt viscosity, which ensures that the resin processes more easily. Melt flow ratio is a calculated QC lab number that is used as an indication of MWD. It is calculated by dividing a melt index measured at a high shear rate by a melt index measured at a low shear rate.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
