Web dryer with variable ventilation rate

Details Web dryer with variable ventilation rate Web dryer with variable ventilation rate

1984-06-08

1986-05-27

Beck, Shrive P.

Coating processes

With post-treatment of coating or coating material

Heating or drying

118 68, 118665, 118688, 432 72, 432 59, 432 8, B05D 304

Patent

active

045915172

ABSTRACT:
A web dryer for use in the graphic arts industry or the like includes a dryer housing through which a printed web travels and which contains a plurality of nozzles, an air inlet, an air exhaust and a source of heat. The desired ventilation rate for purposes of maintaining the interior dryer environment at a required low percentage of the Lower Flammable Limit is designed to be dependent on the measured or calculated rate of ink application to the web. The ink application rate and information regarding the actual exhaust flow or ventilation rate is fed to a ventilation rate control and the exhaust flow or ventilation rate is then varied in response thereto, as by controlling a variable speed exhaust blower. At the same time, make-up air is provided to the dryer interior, preferably at a point remote from the exhaust discharge duct so that it thoroughly mixes with recirculating air within the dryer to reduce condensation problems. The make-up air can be supplied from a number of sources, as illustrated in the various embodiments disclosed.

REFERENCES:
patent: 2743529 (1956-05-01), Hayes
patent: 3521600 (1970-07-01), Toya
patent: 3596071 (1971-07-01), Doering
patent: 3874091 (1975-04-01), Fukumoto
patent: 3909953 (1975-10-01), Hemsath et al.
patent: 4087568 (1978-05-01), Fay et al.
patent: 4414757 (1983-11-01), Whipple
patent: 4494315 (1985-01-01), Roos et al.

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