Method and apparatus for coating plastic bottles

A method comprising using an apparatus comprising a coating chamber, an enclosed cooling segment upstream of said coating chamber, a cooling-gas device for cooling a cooling gas that is provided for cooling a polyethylene terephthalate bottle, an air feed, and a first lance that introduces material into a bottle in said coating chamber and introduces energy into said material to cause a reaction that results in coating of an oxide of silicon on an interior wall of said bottle, which is in said coating chamber, wherein said cooling segment is connected to said coating chamber such that said bottle passes through said cooling segment on its way to said coating chamber and wherein cooled gas that is passed through said air feed into said enclosed cooling segment cools said bottle before said bottle has reached said coating chamber, wherein using said apparatus comprises cooling said bottle within said enclosed cooling segment while transporting said bottle toward said coating chamber, immediately after having cooled said bottle and transported said bottle to said coating chamber, forming a plasma, creating an under-pressure, and coating an inner surface of said bottle with an oxide of silicon, said method further comprising causing an air flow that propels the bottle toward said coating chamber, said air flow comprising air that has been cooled by said cooling-gas device.