Hochgeschwindigkeitsverfahren zur Herstellung einer Folie mit hoher Streckung

摘要

An apparatus and high speed process for heating and stretching a film (40) having a bridle mechanism comprising a first heated roll (15) and a second heated roll (16). The film is stretched as the film is transferred from the first heated roll (15) to the second heated roll (16) which rotates at a speed greater than the speed at which the first heated roll rotates. The film is fed into the bridle mechanism at a rate of about 1,500 fpm to about 2,500 fpm wherein it is stretched to a length that is up to about 450% greater than its initial, pre-stretched length. The increased contact between the large diameter heated rolls and the film and the short draw gap between the two heated rolls result in a highly stretched film having minimal neck-in.