ES304546A1 - Improvements in the method of coating for the manufacture of paper with high brightness (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

IMPROVEMENTS IN THE METHOD OF COATING FOR THE MANUFACTURE OF PAPER WITH HIGH BRIGHTNESS, characterized by passing through a continuous band of suitable support paper by a first roller whose surface has an adjustable convex curvature designed to be able to transversally stretch the paper as it slides on the roller; the strip passes to a paint unit constituted by an applicator roller of the paint in the state of paste and a dosing roller of said paste arranged in parallel and so that they can rotate with different speeds in relation to one another; by means of a level plotted in front of the painting step this step is maintained at a predetermined height between said applicator and dosing rollers; by means of an adjustable pneumatic pressure device with precision valves, the applicator roller can exert a great pressure on the dosing roller between variable limits; the support paper web already painted on one side with exact dosage passes through a cold roll and then through a second tension roller also adjustable; the supporting paper web follows between a counterpressure roller which presses it against a large smoothing cylinder so that the painted face of the paper results in contact with the polished surface of said heated large cylinder and receives moisture on the unpainted face; said moisture is transmitted to the counter-pressure roller by means of an auxiliary cylinder that rotates supported under said counter-pressure roller and whose surface is partially submerged in the water of a tray placed under said auxiliary cylinder; along a generatrix of said auxiliary cylinder is faced a way of adjustable strip to eliminate the tiny specks that may have been deposited on said counter-pressure roller; said auxiliary cylinder is at the same time an improved regulator of the pressure between said counter-pressure roller and the large smoothing cylinder by means of a pneumatic pressure device adjustable with precision valves that supports with more or less force said auxiliary cylinder against said counter-pressure roller and force that through the paper web is transmitted to the surface of the large smoothing cylinder, and finally the band of paper support already painted and dried at the end of its travel on the large smoothing cylinder happens to rest on an adjustable side guide roller that it deflects the trajectory of the paper strip, which comes off by itself from the large cylinder with the high brightness that this method was intended to achieve. (Machine-translation by Google Translate, not legally binding)