Method for manufacturing gas barrier thin film-coated plastic container

摘要

Disclosed herein is a method for producing a plastic container coated with a thin film that is excellent in gas barrier properties, film coloration and film adhesiveness without using an external electrode having a special shape while suppressing deposition of foreign matters such as carbon powders. The method for producing a gas barrier thin film-coated plastic container according to the present invention includes the steps of: housing a plastic container in an external electrode serving as a film-forming unit; placing an internal electrode serving as a raw material gas supply tube in an inside of the plastic container; exhausting gas from an inside of the external electrode by activating a vacuum pump; blowing a raw material gas into the inside of the plastic container under a reduced pressure; and forming a gas barrier thin film on an inner wall surface of the plastic container by generating plasma from the raw material gas, setting a power source frequency of a power source for plasma generation to supply power to the external electrode to be 5.5 to 6.5 MHz.

主权项

1. A method for producing a gas barrier thin film-coated plastic container, comprising the steps of:
housing a plastic container in an external electrode serving as a film-forming unit; placing an internal electrode serving as a raw material gas supply tube in an inside of the plastic container; exhausting gas from an inside of the external electrode by activating a vacuum pump; blowing a raw material gas into the inside of the plastic container under a pressure which is less than atmospheric pressure; and forming a gas barrier thin film on an inner wall surface of the plastic container by generating plasma from the raw material gas, setting a power source frequency of a power source for plasma generation to supply power to the external electrode to be 5.5 to 6.5 MH, wherein the gas barrier thin film-coated plastic container has a shoulder and a body, the shoulder and the body each independently has a b* value, the absolute value of the difference between the b* value of the shoulder and the b* value of the body is defined as x, and x satisfies an inequality “x<1.6”, and wherein (i) the plastic container is a container made of PET and (ii) a DLC film is formed as the gas barrier thin film.