Mountain peaks are beautiful.
Calm water in a lake settles our mind.
Printing is done on paper, plastic films, ceramic plate, rubber, and cloth,
only if they are placed flat.
How can we make them flat?
In addition to gravity, they become flat by vacuum.
The picture below is measurement by laser
on vertical movement of vacuum steel belt surface.
It is controlled within 50 microns.
Steel belt video: http://www.steelbelt.jp/060video/video.php