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E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK. NEW JERSEY Copy No. 1 ^ .I ` .V NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Y-48&-D - SICK LIST STUDS * ELIMINATION OF DARK DUIL MASSTONES Period Covered: January 20, 1949 ~ February' 11, 1949 FILE: DATE: 5/24/49 / NJM7 N42208 I #tt *i i * to FM 0?KK3S *m.g (211,1) Jift mm.nTKfi mg t* cmopsai * iwsf f b *8 D# b * KILLIAH mem BtriaX So. KB4924 Cofjr Ko* l ymi&Rif gtyuf namt courn RESSAEca mi mmmm mi* ms s * - sacs vm awm m.mmAmm np w im MASS5K2J20 Peri* CovewKla Januajy 20# 1949 * F&*ftiy 11, 1%9 Charge 1100*31*3 smi9t 5/U/49 ^/ yW mm ISSUED* 5/24/49 DUP050067268 At the request f the Plant, the problna of comhtlng the <Sastc dull raesstonee of plant production f X*488#D a transferred from the Plant Assistance Group to tho Inorganic Research Group about January SO* 1949* The statu of the problem Is a -latter of E. F* Klimke to J, H, Bailey gated 1/24/49 (a espy of tiieh is attached), The balk f production at that time Mt in versus standard. Heavy produotlcn wt^<4nfa<f^f,|[ <fefl>ded ^ piygi at of prfrfrwtion tha aww'awlP'M Ft hp *h* Division had S liKnfldints angMt<mm tfi wM<uaa |ka |M W <>mH4sw i s^swaeed til thtt vey w v p1 vmss am*# nsBvOh neepoBMOveMancs eeuprweiwwe^ww m* v^ef' fly *^^np> ,aiser**veB-wiSF Accordingly* teediate production a# based ee the recoamendaticsB of the past Assistance Group* An avaltiatlw mi mtia of flivanl bstdiefl *A on thtt standard formula and on a foraila anabotying the recaasa^tiono of the Plant Assistance Group, This valuation shewed that final eat controls finished in the laboratory ere almost Invariably superior (lighter and ibr* intense in masstone) to press sabs* lump, and grind -saaples from th plant* to addition* it as also apparent that a continuous degradation Is quality as occurring daring plant processing, Ho particular quality advantage as evident fTon use of tho foraila chants hieb had been recdsaeuded (io, undersurface strike, increased strike tine, "dumping" in soda ngh), * . * <1110 natter as investigated in the plant, and gross contaaiaation of t4gg*D 1th various other pignents as observed, These findings ere brought to the attention of the Production Division supervisory pereonnel, A similar observation regarding contamination of T488*D io to be noted la the letter of , F. CLoniae to J, H, Bailey of 1/24/49. Th correction of thie situation led to an immediate the quality of the material being raamifactured* la The fcUoninaeewp eb^Sb^bbbbb^^'B^^ ere else found effective in iaarovlag thejen^weBeiBBveir TMb b bp .bbb^^b^b .^-"'Bw bib BeeTMTM""V ^**^0 ^^b ^b maastene appearance of plant T*46&*D manufacture. 1. Strike temperature Increased to 90*F for lighter sore intense masstanec. .2, Strike tine nay bo Increased to 40 Mantes if redder material (than that produced ith standard strike tins) is required. 3, X4dS<B manufactured in the green vats is anally lighter mod acre intense in fcaasteno than aaterial Manufactured In the yells vats. of the manufacture of this code* pins the institution of a 90*F strike/haa nad possible sarmfaeture of standard nudity material in the plant. afflasisa DSNb49-20 8B, gj||, 15, 14 DUP050067269 c 0 V Y CC: Messrs, Y.H, ChaLupskl C,D, Atkiagoa H Arnoul j*D, Moomaw AJ, Hughes 11,J Hughes AJ Sauerbom P0B,, Killian A, Siegel J, Jackson Newark, flew jersey January 24, 1949 HR, j. H, BAILEY NEWAISC Y^gfeB PUKT ASr.ISTAI-KJE STATUS Active investigation of Y-4S$~B bag been transferred Jfroa the Plant Assistance Group to the Ihorgcnic Research Group, Aa reported in the Becember Plant Assistance iNnaasy (January 10, 1949) it hag not been possible to 'consistently manufacture standard quality X-<48$~, therefore e litre previously recoaciended rer.teadardizaid.on at a more repro&ctble quality level * vs It,, .8,sra'., vs to s.cfcll. Although this proposal mu rejected, tee recommend that the variables used be continued since they appear i give .a higher percent OK straight performance than standard formula, These variables ares* . X The soda ash added to the lead nitrate solution should be added under the . surface, 2* Strike time should bo increased from 25 to 40 minutes, 3, The soda ash after strike should be dumped in at once, not ^during 2-3 ainut'SE", 4, Washing tire should be increased froa 4 to 8 hours, 5, Single batch (1663-r size) identity should be maintained during processing. Extreme care should b taken to insure equipment cleanliness, The press, as well as the slurry line from the tat to the press, should be thor oughly cleaned out before starting a production run and should be well hosed between batches. Grinding and packing equipment should also receive special attention. Use of the above variables, use of a yellow press (#23) for Y-488-D exclusively, and observance of cleanliness precautions in "toe press room, dry room and grind shop has made possible production of 12 out of 16 OK straight batches so far in January, All these batches, however, are dull in nnsetona N42208.01 DUP050067270 and. tint, ecisifimteg pwiotts eijpsriaacs, % copy of this latter the scheduling group is requested to send all future Y'-.480-P batch cards to 3r, <feeh:.son* BFEsGC a, f , KLans, j r . CHEMlCiiL DIY1SIOH DUP050067271 CO; Ssssrs, y*S,Bog V*H* Chalupslci C, IX Atkinson H*Arnofcl J.S!lpoisew A*y*iuglies HR, ,JT. H* BAXlEtslBmSlC S J,Hugh3 A#J*S&nerb oa IXB * Killian A,Siegel y9*lisrris0h <X Jackson lew-ark* lew Jersey February 11, 1949 The following recommendations stmsmariz the findings of our investigations to date, We believe that strict of thee factors will permit tbs manufacture of standard quality material, Restand&rdisatlon is pot reeowsanded. We request that the Plant rssma responsibility fox* the manufacture of this cod, X, Baking, .ffrcoodure The use of standard formula modified la the following fashion is recommended* A* .Strike temperature should he raised to 90Fg, B* Strike time my be Increased to 40 minutes if redder material {than that produced with, standard strike time) is required, 0. I other changes from standard procedure an recommended* 2, process im .Prop doreg Too great emphasis cannot be placed on the necessity f maintaining scrupulous cleanliness of strike equipment, 'pip lines, filter presses, 3^f3F*pHS7~tE'ying .ovens, dumping hoppers, all handling containers, and grinders. These observations have been previously indicated in the Plant Assistance Group's letter of recossicndat ion* Very gross contamination, of Y-488 lots has been pointed out to Hr, 0, D, Atkinson,In his area. With his assistance, corrective measures were instituted starting with lot 6A6SY, Results were immediately apparent from the elimination of all darkness and most dullness of maastone even while operating on it^dj^Lfettula* N42208.02 DUP050067272 Th following specific reeoismiawdatloa have been made* A* U & press ** IS frames for Y-48S-D and Y-49B-D exclusively Tlis ppp and hose lines feeding this pros should act be used for any other color during the campaign. Tress wash 8 Hoars, as per Plant Assistance Group* recommendations B Us selected dryer pass ** soaked in alkali and thoroughly scrubbed free of all previous odors for these codes ex clusively* .0 Do not use brick dryers for these codes.# Us P# & S. high velocity dryers exclusively* D* Use selected drums for handling these codes exclusively! or preferentially use liners in drums# E Maintain scrupulously clean conditions in feed hoppers and grinding equipment F Handle and store all Y-483-D drums so as to prevent contamina tion ' G These conclusions are based on Chemical Division rubouts of plant grinds They hate been approved, by H* Arooul and AHughes Serious discrepancies have been noted in evaluation of Y-480-D .lots between Chemical Division (using Hoover Muller) and Control laboratory using hand smXlers. These differences have been resolved usually in favor of the Hooves* Muller results. Cont.aminefcion of rubouts is just asi serioue as contamination of color during processing Careful scrutiny of the testing method for prevention of contamination is essential JllRMK DUP050067273 CC* .Eos are# y.E.Bocge, Wilmu fH,Oils'.1upski, lutea C . D s, Atkinson, " E.#Arn0uXs n DaBKillianj, Wwk. A,-Siegel, w B * tt* Perkins3 !! .JoO.,Sk>rrisonj " JB-Jacks on 3 n Sswark, Sow Jersey February 25, 1949 MB, J, H. bklJMiWmikm. Y-488-D ' ElIiilBATlOII OP' BED-BULL MA8ST0ME Current observations upon companion . batches of y>4S8**D fl/s prs3 load mad in Vat 844 ** 1/2 press load made in Vat 262) hare shown consistent advantages resulting .from use of the green Vat SOB* Batches made in this vat are lighter and greener in mass* tone sad closer to standard than those -made in Vat 244.# This is probably the result of the better agitation .of the green vat which is far mors uniform than the type of agitation used in Vat 244# This point has been substantiated by laboratory observa tions* The following pairs of batches may be referred tor* HEADINGS VERSUS BTASfDABP T-4S8-D Chemical Division Vat Dot --W~"" Control Lab# " m 3TB. TIJPf 24-4 64815 s.dk, ,s.g]p 262 04817 . vvs.dk,, gy. vs.elk*, gr, ,dull e.lt, to lt.,(gr.) 105 s.gr*.dull 105 s.gr.sdul! 244 64860 s.dk*,3.rod 268 64862 vs.lt*9s,gr* svdk* 3&.rsd vs.It,,(gr.),vs dull 90-92 red 102 a, ditll .244 64858 s.dk* 8.#?ed 282 64957 ws.dkvys.gr.. s.dk.Ss.red vs.dk,,gr.,dull 102 s.gr,& int 98 s*lnt 244 84977 vsudk. ,vs,red 262 64979 vvs.lt,., vs.gr* vvs.lt,vvs* dull, ws. red 98 vvs.lf. jvs.gr.,s,dull 98 vs Ss,iat. VSainto la view of these findings we recommend that the use of yellow vats equipped with turbine type agitators be abandoned as far as manufacture of this code is concerned. If this is not feasible, because of production demands, then Y-488-D for Puller (light intense material) should be scheduled in the green vat exclusively# DUP050067274