Apparatus for heat shrinking a film wrapping an object and method for operating the apparatus

An apparatus for heat shrinking a film wrapped around an object, the apparatus comprising:

• a housing having a heat treatment chamber configured to contain steam, the housing including a window arranged to allow an operator to look into an interior environment of the heat treatment chamber,
• a conveyor configured to support and move the object through the heat treatment chamber,
• at least one steam supply configured to supply steam to the heat treatment chamber,
• a steam outlet device including one or more outlets configured to output steam, the steam outlet device being connected to the at least one steam supply, the steam outlet device being disposed in the heat treatment chamber along the conveyor, and the one or more outlets being directed towards the moving object, and
• a blurring reduction system including:
• an air flow generator configured to generate an unheated air flow directed along and at an interior side of the window,
• an air inlet configured to receive an intake of the air flow from outside the heat treatment chamber,
• a secondary chamber arranged in between the window and the heat treatment chamber, the secondary chamber being connected to the heat treatment chamber by a passage, and
• the window, the passage of the secondary chamber, and the steam outlet device being aligned to allow an operator to view the steam outlet device in the heat treatment chamber through the window and the passage of the secondary chamber.