High Quality Virgin LLDPE Smooth with Opening Blown Film

Both LDPE and LLDPE have excellent rheology or melt fluidity. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short branched chains. LLDPE maintains a higher viscosity during shearing, so it is more difficult to process than LDPE with the same melt index. In extrusion, the lower shear sensitivity of LLDPE makes the stress relaxation of polymer molecular chain faster, and thus the sensitivity of physical properties to the change of blow up ratio decreases. In melt elongation, LLDPE usually has lower viscosity at various strain rates. That is to say, it will not produce strain hardening in tension like LDPE.

Although LLDPE and LDPE in the past belong to the same density range, their basic physical properties and molding processing characteristics are different due to their different molecular structures and melting rheological behaviors.