SYSTEM AND METHOD FOR FORMING HYDROPHOBIC STRUCTURES IN POROUS SUBSTRATE Russian patent published in 2018 - IPC B41J11/00 B41J13/02 D21H23/56 D21H25/06 D21H17/60 D21H19/18 G03G9/87 B05D1/28 

FIELD: technological processes.

SUBSTANCE: invention can be used in the production of devices for biochemical analysis based on paper. Device for distributing hydrophobic material in the substrate comprises a first roller and a second roller, heater, printer head and a carrier for the substrate. Second roller is configured to interact with the first roller to form a gap. Heater is operatively associated with the first roller and is configured to heat the first roller to a first temperature that is greater than a second temperature of the second roller. Printer has a plurality of spray nozzles configured to eject droplets of hydrophobic material in a predetermined pattern onto the second roller. Carrier for the substrate is configured to move the substrate through the gap at least twice at a predetermined linear speed of about 5 inches per second. First roller interacts with the first side of the substrate, and the second roller interacts with the second side of the substrate to allow the hydrophobic material to penetrate the substrate in response to a temperature gradient effect in the gap between the first roller and the second roller.

EFFECT: invention provides the improved flow control of hydrophobic material, such as wax, applied to the substrate.

18 cl, 11 dwg