A method of stretching films in which all or a portion of the width of the film
is cooled during or just after stretching so as to improve the uniformity of the
film. The includes stretching a polymeric film in a tenter that grasps the film
with a plurality of clips along the opposing edges of the film and propels the
clips to thereby stretch the film. The tenter includes driven clips and idler clips,
with at least one idler clip between respective pairs of driven clips. The cooling
is done so as to improve the uniformity of the clip spacing relative to the spacing
obtained at otherwise identical process conditions without such cooling.