Advancing material of indeterminate length – With adherence or attraction of material to advancing means – By pneumatic pressure
Patent
1988-12-27
1991-03-12
Stodola, Daniel P.
Advancing material of indeterminate length
With adherence or attraction of material to advancing means
By pneumatic pressure
B65H 2012
Patent
active
049986589
ABSTRACT:
An unported vacuum drum has a system of closely spaced small grooves in the outer surface thereof and holes drilled in the drum provide communication between the grooves on the outer surface and a space on the interior of the drum. The interior drum can be connected to a source of vacuum for applying the vacuum through the holes to the grooves. In order to avoid defects that may occur in a web brought into contact with a drum, the outer surface of the drum is covered with a porous sleeve. The pores in the sleeve enable the vacuum to be applied from the grooves to the outer surface of the sleeve for holding the web onto the sleeve.
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Distefano Joseph
Haas Roger
Kelley Fred D.
Nestle Mark
Childress G. Herman
Eastman Kodak Company
Stodola Daniel P.
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