Document jmkz1Jkr0z88B7mxx3m7E3g1y

IlUliiitt U) ilnaltHtl UuMiUrtiwul UMHrtiil CROSS REF; File W-502 W-065 "45 Process" W-521 J,CCs Mr. 1. S. Allen, Wilm. D-8012 Mr. A. Gallo - Plant; vr-360 Mr. E. p, Fitzgerald - Lab, "46 Process'* c 2111 R 1 S 2 u Philadelphia Laboratory AriU Z,RiffiCI COPY MOT TOR GiCMTIOif LABORATORY raOEMDUM REPORT #M~107 LOMP COLOR The term "Lump Color" refers to the physical state of a pigment and applies to precipitated, unoaloined, in herently fine pigments. Pigments as now used are usually in the poured state since they hare been passed through a micropulverizer or similar mill. Generally such treatments of pigments are desirable but with iron blues and organic reds a bad dusting and a mill loading problem results. with the conventional method of grinding, the use of unpulverlzad pigment resulted in considerable seed and some grit. Since the "45"and "46 Process" hare proved more efficient than conventional grinding, the dried press cake was retested in the Mllori Blue and Toluidine Red formulas. Examination of the mill bases and enamels showed the absence of seed and grit. The production advantages in. using lump pigments are readily apparent. The dusting problem is better than 90$ eliminated, a few fines are usually presentv It is possible to load a mill more rapidly since it is not necessary to wait for the usual cloud to settle between additions and the denser form can be packed thereby eliminating at least one spin. There is also a quality advantage. Tints made from bases using lump pigments are definitely cleaner than tints made from bases containing pulverized pigments. This has been checked in both laboratory and plant grinds. While it is desirable to use lump pigments as widely as possible, some pulverized pigment will have to be LABORATORY MEMORANDUM REPORT #M-107 (Cont6) continued. The problem of using lump pigments In roller mill and stone mill grinds has not been solved. Permanent codes bave baen issued for two lump pigments. W-521 W-360 LUMP MILORI PLUS LUMP TOLUIDITflS RED lPC;mc W, P, COLIO DUP030002942