Method of applying coating
AssigneeSewell Plastics, Inc.
InventorsGerhard E. B. Nickel, Alfred C. Alberghini
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Abstract
A method for applying a PVDC polymer coating to the outside of a PET parison includes deionizing the surface of the parison, dipping the parison into an aqueous PVDC dispersion, withdrawing the parison at a controlled rate to prevent slubbing of the polymer coating, and drying the coating by exposure to desiccated air. The method dramatically reduces the energy requirements for coating operations yet produces a finished biaxially oriented PET container having superior gas barrier characteristics.
Claims8
A method for producing a parison of amorphous PET having an outside coating comprising the steps of:
- (a) deionizing the surface of an amorphous PET parison;
- (b) dipping the parison into an aqueous PVDC dispersion;
- (c) withdrawing the parison and an adherent film of the PVDC dispersion below the rate at which film slubbing is observed;
- and
- (d) exposing the parison and film to ambient temperature desiccated air until the film is substantially dried.
In the process of applying a PVDC coating to an amorphous PET parison by dipping said parison into an aqueous PVDC dispersion and drying said coated parison, the improvement which comprises
- deionizing the surface of the parison prior to dipping it in the PVDC dispersion,
- withdrawing the parison and an adherent film of the PVDC dispersion from the PVDC dispersion at a rate below that of which film slubbing is observed, and
- exposing the PVDC film-coated parison to ambient temperature desiccated air until the film is substantially dried.
Dependencies are inferred from the claim text.