| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging film which exhibits superb characteristics such as low-temperature shrink, special shrink stress, elongation and high transparency after shrinkage and further, is best-suited for stretch, elongation and high transparency after shrinkage and further, is best-suited for stretch shrink and also a shrink package which shows a neat finish, using various kinds of automatic packaging machines, and almost does not cause a container deformation when heated by an electronic oven. SOLUTION: The packaging film is structured of at least three layers composed mainly of an ethylene polymer resin and a propylene polymer resin and has the described characteristics (a) to (d) and the shrink package using this film is provided. (a) The shrinkage factor by hot blast at 90 deg.C when measured by ASTM D1204 is 20% or higher both in longitudinal and crosswise directions. (b) The average value of a maximum heat shrinkage stress at 100 deg.C when measured by ASTM D2838 is 1.5 to 2.5 MPa in the longitudinal and the crosswise direction and the average value of the equilibrium heat shrinkage stress is 0.5 to 1.5 MPa both in the longitudinal and the crosswise direction. (c) The tensile stress at the time of 30% stretching when measured by JIS Z1707 is 10 to 22 MPa in the crosswise direction. (d) The haze after 0 to 30% shrinkage at 100 deg.C when measured by JIS K7105 is 2% or lower. |
