Method for making a multi-layer plastic container having a carbon-treated internal surface

A method of manufacturing a multi-layer container coated with a carbon coating, which comprises:

• providing a multi-layered container including an upper wall portion having an opening, an intermediate side wall portion positioned beneath the upper wall portion, a base portion positioned beneath the intermediate wall portion, and a central vertical axis, said container further including a plastic inner layer having a vertical length and an inner surfaces, and an outer layer including recycled plastic having a vertical length and an inner surface that is substantially coextensive with the inner layer, wherein the inner layer has a thickness that is between 0.022 an 0.833 of the thickness of the outer layer at corresponding points taken along the vertical lengths of the inner layer and the outer layer, the outer layer comprises at least 0.40 of the overall weight of the container, and the outer layer is in a contacting relationship with the inner layer along substantially the entire inner surface of the outer layer;
• enclosing the multi-layered container within a hollow space provided to accommodate the container;
• discharging the air within the container and creating a vacuum;
• charging the internal volume of the container with raw gas;
• and
• forming a carbon coating from said raw gas on the inner surface of the inner layer of the container, wherein the carbon coating has a thickness that is less than 10 μm.