| 摘要 |
PURPOSE:To improve the operatability of orientation and to prepare biaxially oriented film whose transparency has been remarkably improved, by biaxially orientating a resin compsn. which consists of a specified quantity of linear low density polyethylene and a specified quantity of branched low density polyethylene. CONSTITUTION:An un-drawn film or sheet is prepd. by using a polyethylene resin compsn. which consists of 97 to 55pts.wt. of linear low density polyethylene whose melt index is 0.3 to 4g/10min, pref. 0.5 to 3g/10min and 3 to 45pts.wt. of branched low density polyethylene whose melt index is 0.3 to 4g/10min and the film or sheet is then biaxially oriented by a draw ratio of less than 3 times to the longitudinal direction and a draw ratio of 3 to 9 times to the lateral direction. The biaxially oriented film can be thereby obtd. stably and in high efficiency and the films prepd. has excellent transparency, uniform thickness and excellent strength. |
