INTRODUCTION
IT IS WELL known that a good shrink film depends on selecting the
proper material and operating conditions [1,2,6]. Different levels of
MD and TD shrink can be obtained for the same material by simply
modifying film orientation by changing blow-up ratio (BUR), frost line
height (FLH), and drawdown ratio (DDR). On the other hand, although
fractional-MFI low density polyethylene (LDPE) is commonly used for
this application, other materials such as high density polyethylene
(HDPE) and linear low density polyethylene (LLDPE) are added to gain
specific properties, such as rigidity, tear strength, and puncture
resistance.