Linear Low Density Polyethylene:
Linear low-density polyethylene is shortly known as LLDPE. LLDPE is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain of olefins. Linear low-density polyethylene differs structurally from predictable low-density polyethylene (LDPE) because of the absence of long chain branching.
Processing & Properties:
LLDPE has a unique melt flow properties. LLDPE is less shear sensitive because of its narrower molecular weight distribution and shorter chain branching. During a shearing process, such as extrusion, LLDPE remains more viscous than LDPE. The lower shear sensitivity of LLDPE allows for a faster stress relaxation of the polymer chains during extrusion, and, therefore, the physical properties are susceptible to changes in blow-up ratios. In melt extension, LLDPE has lower viscosity at all strain rates. As the deformation rate of the polyethylene increases.
|Density||0.88 – 0.915 gm/cc|
|Tensile Strength||30 MPa|
|Flexural Modulus||0.35 GPa|
|Izod Impact (Notched)||1.06 KJ/M|
|Elongation at Break||400%|
|Heat Distortion Temp. (Load@ 1.80 MPa)||37 Deg C|
|Melting Temperature||130-160 Deg C|
|Mould Shrinkage||Max. 3%|
|Mould Temperature||20-60 Deg C|
|Operating Temperature||Max. 50 Deg C|
|Water Absorption||0.01 %|
|Oxygen Index||Max. 17%|
it is used for plastic bags and sheets, plastic wrap, stretch wrap, pouches, toys, covers, lids, pipes, buckets and containers, covering of cables, geomembranes & flexible tubes.