PURPOSE: To obtain the film excellentin transverse tear resistance, lengthwise strength, moisture proof, etc. by rolling the film of polyethylene resin having a density and a crystallization within specific range in the lengthwise uniaxial direction.
CONSTITUTION: There is provided the film of resin having a resin layer composed of one kind or more selected from polyethylene, ethylene-vinglacetate copolymer and ionomer resin that all have densities 0.94 or less and having a crystallization of resin 60% or less. In order to obtain the title resin film, lengthwise uniaxial rolling is carried out by such a method as this film is allowed to pass between a pair of rolls or the like. It is preferable that the rolls take the room temperature or more, the resin crystallization initiating temperature or the softening point or less, 100W1,000kg/cm is given to the linear pressure of the rolls and 3W6 times is given to the rolling ratio defined by the initial thickness/the rolled thickness of the film.
TOGAWA HIROSUKE
SHIRAI AKIMOTO
| JPS5349072A | 1978-05-04 |