US 12,447,738 B2
Device and method for cleaning exhaust air
Stefan Röhl, Munich (DE); Andreas Geishauser, Munich (DE); Revdin Dedic, Markt Schwaben (DE); and Fabien Ferron, Munich (DE)
Assigned to Canon Production Printing Holding B.V., Venlo (NL)
Filed by Canon Production Printing Holding B.V., Venlo (NL)
Filed on Aug. 18, 2023, as Appl. No. 18/235,408.
Claims priority of application No. 10 2022 120 972.5 (DE), filed on Aug. 19, 2022.
Prior Publication US 2024/0059058 A1, Feb. 22, 2024
Int. Cl. B41F 23/04 (2006.01); F28D 21/00 (2006.01)
CPC B41F 23/0426 (2013.01) [F28D 21/0003 (2013.01); F28D 2021/0019 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A printing device, comprising:
at least one print group configured to print an image onto a recording medium;
a drying unit configured to fix the image onto the recording medium;
a heat exchanger, the heat exchanger configured to transfer thermal energy from the exhaust air to a cooling fluid; and
a device configured to control a cleaning of exhaust air from the printing device by the heat exchanger, the device is operatively connected to at least one of the printing device, the drying unit, or the heat exchanger and comprising a controller configured
to operate the heat exchanger in a standard phase such that an output temperature of the exhaust air at an output of the heat exchanger exhibits a standard value, via which hydrocarbons are condensed out of the exhaust air;
to operate the heat exchanger in a regeneration phase such that the output temperature of the exhaust air exhibits a value that is reduced relative to the standard value by at least one of reducing a temperature of the cooling fluid or increasing a volumetric flow of the cooling fluid, via water is condensed out of the exhaust air, wherein the reduced value and/or the standard value of the output temperature of the exhaust air are such that: a fraction of water in a condensate generated from the exhaust air in the heat exchanger is greater at the reduced value than at the standard value; and/or a quantity of condensate that is generated per time unit is greater at the reduced value than at the standard value; and/or the reduced value of the output temperature is below a dew point of water, and the standard value of the output temperature is above a dew point of water;
to determine one or more measured values with regard to the quantity of condensate that is generated from the exhaust air in the heat exchanger; and
to determine, depending on the one or more measured values, whether a transition—starting from a regeneration phase—from the regeneration phase into a subsequent standard phase, or a transition—starting from a standard phase—from the standard phase into a subsequent regeneration phase, is effected.