APPARATUS FOR AIR-COOLING A TUBULAR PLASTICS FILM BLOWN BY A BLOWHEAD

摘要

An apparatus for air cooling a tubular plastic film blown by a blowhead to introduce cooling air to within the tubular film at a pressure so that the interior film pressure exceeds the blowing pressure necessary for stretching the film in its plastic state. Mechanical supporting elements of low coefficient of friction externally support the tubular film issuing from the blowhead at least up to a position where the film has solidified.