Abstract:
Low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) belong to
polyethylene group of thermo-plastics. LDPE is generally the softest and least crystalline of all the
polyethylene. LDPE has a unique combination of properties namely toughness, high impact
strength, low-brittleness temperature, flexibility, processibility, film transparency, chemical
resistance and having a density of 0.91 – 0.94. LDPE applications are mostly film based. The
most common application areas are in general food packaging, milk pouches, industrial products,
textiles, frozen foods, agriculture and horticulture section etc.
LLDPE has all the advantages of LDPE together with the added benefit of low energy output
which leads to a saving of over 20% in the manufacturing cost. The use of LLDPE has been
predominantly in blends with LDPE as far as film extrusion is concerned. LLDPE and LDPE
blended film are used for milk packaging, nursery bags, heavy duty sacks and general purpose
bags.
