Roller device for use in coil coating process, coil coating apparatus and method for controlling temperature of coil in coil coating process

A drum device (10) for guiding a web (12) in a web coating process under vacuum conditions, a web coating apparatus (14) comprising a vacuum chamber (16) comprising the drum device (10), and a method for controlling the temperature of a web (12) in a web coating process under vacuum conditions. The drum device (10) comprises:-a rotatable drum (100) having a web facing surface (102), the web facing surface comprising a first web facing surface portion (104); -a gas distribution system (400) for providing a gas flow (115) comprising a gas composition comprising a vapour of a gas and/or a liquid into a void, denoted as a first void (110), between the web (12) and the first web-facing surface portion (104); and-a temperature adjustment system (300) adapted for controlling the temperature of the first web facing surface portion (104) such that the gas composition cools in such a way that the gas and/or the liquid changes the aggregation state, thereby forming a non-gaseous mat (116) in the first void (110). 一种用于在真