Iron corrosion; anti-fouling and anti-corrosive paints . ing, and soforth, performed by hand in the case of small quantities,but necessitating the employment of properly constructedpaint mills when the work is on a large scale. Paint mills may be divided into three classes, accordingas the grinding of the material is effected— (ft) Between two slanting, roughened surfaces, one fixedand the other executing a rotary movement; (h) Between two flat grooved plates, moving eccentricallyin opposite directions ; or (c) Between a series of rotating steel, porphyry (granite),or porcelain rollers. IRON-C
Iron corrosion; anti-fouling and anti-corrosive paints . ing, and soforth, performed by hand in the case of small quantities,but necessitating the employment of properly constructedpaint mills when the work is on a large scale. Paint mills may be divided into three classes, accordingas the grinding of the material is effected— (ft) Between two slanting, roughened surfaces, one fixedand the other executing a rotary movement; (h) Between two flat grooved plates, moving eccentricallyin opposite directions ; or (c) Between a series of rotating steel, porphyry (granite),or porcelain rollers. IRON-CORROSION AND ANTI-COBROSIVE PAINTS. 197 For works of moderate size the mills of class a are suit-able, but larger quantities can only be dealt with by rollermills (class c). Fig. 55 shows a funnel-shaped or conical mill, the uppergrinding surface of which is attached to the fixed feedhopper, whilst the movable lower conical grmding surfaceis adjusted by a screw and spindle so as to leave merely asmall aperture for the outflow of the ground paint. The. Pig. 55.—Paint mill with conical grinding surfaces. (For power.) conical surfaces must be accurately turned, the actual grindingsurfaces forming only a portion of the funnel or cone, whichportion is in both cases riftled in order to increase the grind-ing power. The riffles run from the centre towards theedge, which, however, they do not quite reach. The paint to be groimd is put into the hopper, and ouissuing from the mill is conducted into a recipient belowby means of a scraper placed at the side. 198 IRON-COEROSION AND ANTI-CORROSIVE PAINTS. The larger mills are always of the roller type, such asillustrated in Figs. 56 to .58. They contain from three tosix rollers of equal dimensions, mounted one above another
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
