| Rotating
unions maintain huge calender rolls at desired temperature level
 In
extrusion plants for cast film, often called flat foil production, calendars
play a unique and important role. They are not only crucial for the
quality of the transported foil (webs) but they are also of vital importance
for the speed of the production lines. The web width may vary between
3 1/3' to 6 1/2' while the roll diameter may vary between 15"to 20".
One Deublin customer, however, decided to build a very unusual super-size
calender. Each of the rolls is 3' in diameter with a width of more than
18'. Each roll weighs 10 tons with a torque of 8,859 lb-ft. The total
weight of the calender is 62 tons. The rolls turn at a maximum speed
of 142 feet/min.
The cooling capacity of the rolls of 615 BTU/hr requires a flow of 310
gpm. This is accomplished by the Deublin 6400 Series Rotating Unions.
Equipped with the exclusive "Cartridge Seal" technology, Deublin offered
the appropriate solution for this application. Deublin's exclusive "Cartridge
Seal" design allows on-the-machine replacement of seals. There is no
need to dismantle the unions from the rolls. Replacement of the sealing
elements can be conducted on the machine at the customer's plant nor
is it necessary to remove the flexible hose connections.
The long service life of the sealing elements, the ability to choose
various sealing materials and other engineering features such as the
widely spaced heavy duty ball bearings had led to the selection of the
6400 series rotating union to be installed on such a huge Super Calender.
Deublin Company
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