The Effect of Polypropylene Molecular Weight Distribution on BiaxiallyOriented Film Stability in the Tenter Process

This study investigates the impact of polypropylene molecular weight distribution (MWD) on thestability of biaxially oriented polypropylene (BOPP) film production in the tenter process.Rheological techniques were used to analyze five grades of polypropylene homopolymer todetermine the molecular weight distribution (MWD). Results indicate that a balance between highmelt strength (related to the high molecular weight component) and good processability (associatedwith the low molecular weight component) is crucial for optimal film stretchability and productionline stability. The optimal balance between elasticity and processability determines film stretchabilityand production line stability. Our findings highlight the importance of MWD control for improvingBOPP film production efficiency and reducing waste.

کلیدواژه ها:

Polymer rheology ، Bimodal MWD ، BOPP film ، Elasticity ، Processability ، Stretchability