ORIENTED FILM EASY TO SPLIT AND METHOD OF PRODUCING THE SAME

摘要

An oriented film easy to split which contains nylon (Ny) and meta-xylene adipamide (MXD6) at the weight ratio of 40-85:15-60 and which were oriented with magnification above 2.8 times to both direction of MD and TD. The concrete example of nylon (Ny) composes of as nylon 66 (Ny66), nylon 6-66 copolymer (Ny6-66) and so on. Under this manufacturing method of oriented film easy to split, when a raw film is heated in the biaxially orienting process based on the tubular method, heating temperature of side part to direction of width when folding bubbles is controlled along the circumference direction of bubbles so as to be lower than the heating temperature of part which is used later as a product. The process to give heat treatment to films has a process of first step heat treatment implemented for films at temperature between 120 degrees and 190 degrees based on tubular method or Tenter method and a process of second step heat treatment implemented for films at temperature between 190 degrees and 220 degrees based on Tenter method.