EFFECT OF POLYMER PROCESSING CONDITIONS ON SHRINKABILITY OF LDPE AND LLDPE FILMS, AND ON OPTICAL PROPERTIES OF LLDPE FILMS

摘要

The influence of the die gap (DG), the blow up ratio (BUR) and the frost line height (FLH) over shrinkability of LDPE and LLDPE films, and on the optical properties of LLDPE was evaluated using a 2~3 full factorial plan. For LDPE and LLDPE, shrink decreases in the extrusion direction and increases in the transverse direction when BUR increases. The die gap and the frost line height do not affect the shrinkability of LLDPE. Regarding LLDPE films optical properties, the haze decreases and the gloss increases when both, the FLH and the BUR, decrease.