APPARATUS AND METHOD FOR PRODUCING COATED FILM

摘要

The invention relates to apparatus and a method for producing a coated film in which a cooled polymeric tubular extrudate is coated, reheated and inflated to yield an oriented, coated tubular film. The apparatus includes a coating head comprising a rotatable assembly including a support member ¢13! providing: an orifice ¢14! through which the tubular extrudate may be fed, a plurality of spreading members ¢19! spaced-apart around the orifice, mounting means ¢15! for each of the spreading members operatively associated with the support member and displaceable relative thereto, and means ¢21! for biasing each of the spreading members into engagement with the tubular extrudate. Liquid coating medium is suitably deposited on the extrudate from a spray assembly, and the coating assembly is rotated around the extrudate thereby spreading and polishing the deposited medium to yield a uniformly coated film. The system is particularly suitable for the production of polymeric packaging films having an antistatic coating on the surface thereof.