Document 6NVoyyrxk2G5gja2DoGVGQ8R

ABOUT REICHHOLD PHENOLIC MOLDING COMPOUNDS? en years ago when other companies were pulling in Ttheir horns and getting out of the business of man ufacturing phenolic molding compounds, Relchhoid This, lends itself to uniformity of plasticizing and molding in injection machines. By contrast, use of the conventional two-roll mill to manufacture phenolic3 Chemicals, Inc. reversed the trend and went into the business. inherently leads to non-uniform heat history since the material fed on the rolls first has the most heat his At that time, Relchhoid took out a license to tory. There is also no mixing from the left side of the manufacture these compounds using an extruder rolls to the right sfde. The work input is greater on a process developed In Europe. This method of mixing two-roil mill.artd ppwerinpirt increases as roiling time the ingredients to make a phenolic molding compound is the key factor in making ftCi phenolic molding cony pounds different from rriost other- compounds avail increases. Sheet cuts are made la ity to achieve mixini,and toisroperatJon leads to widely varying work; Inputs- as'indicated-'on wattmeters-attached to the- able today. ' 1 '' _ Robert Schmittberger.Mpnager of Research and? Development.-for Molding^Compounds,, explains,thi|T as follows: "All; geppralrpui^iOSa? phenolic molding compounds arerhasically tHsts^e^BljtTt^et;fat-th|at4J. drive motors. The'R'pl extruders thoroughly mixmate1 rials at lo.Wpr and constant.work Input and-at a steady ' ' temperatiire;gradjegt l(i the-extrpder. THIs.-rosults in . ;betfef;"m6lcfjhg iatitude-'-as well as more efficient `rtiiang," rTf. * ~s * ReichhokF injection type .materials'are fdrjhiiigji, ., Orte'qf the mostfesSehtial chare'cterisBc's needed others"lh,inclustry'&r'(Tud to'-'a numbet'irtifactd^,-'- , . fipr;#i iijjqetibh nriatlflaj i^good iripid release, which "First, there is a' similarity between, th^methbijf- . S'a^mblhatfdri.of'factofa:`(a) the parts musf'feadlly of Injection. moldih^'gnd=thb;;mani^ir..in 'WhiiJi materials are rnahWcttued!.R6iGhhpldjrGhernicaJs:iJ . the only phenOlTe' (fielding cornpkMnd S.0p|lip/vjh??rpahufaclures-^clusi^t'by1.atitr,L57ojj>fS4e;ad:qt;tfi'|' conventional twojtblTmjn ^ttip^.Ttm sirnil^fEiesTiy our extrusion, ^prodyctfon^eguirthfent' and.'TnjCctiofr molding equipme)^^^',r^&fc .a|fpglfenjt.iD ,)di'eJeeg(i reje>tjjroto'tfte><^nt(eSi (b}.the'sprue should,; break ' puffideptly far; BaSr'toward .the cylinder^ s6 thSV a r.t succeeding shpt; 'arid, (?) *i^^as(^B^ma^ij4ri2ip,^jf'V9hts must comeroffwith - '^;.the'precW|pd:toj^eys.;if:4t\ is- necpssarjfetiroppivthe' ,'dpbktb blow.nh aTpieFepf flash or chip-off'so'rne flash; ' ip a.yent, o^tiitlujn eycjds cpnnot be obtained hopper, jacketed temperature.contiblfed^jl^ wfijeB^r#i.go'^itLori' t&.1 ... RCI nJectiQntjg^tpVfaIs are specially.'formulated. -Arid Jubrl<^<rtdi.iBW^iw tflst- the entire mold will'be . both. fn.-tH* ^i^Sa^^j|teia^ge.^iispt}H^.' clbari after ejfiction/bylthe'khpckputs'.; ` i':\ \ ' s into, a . 'util This who piastic!feeSrft:tri.fij|!mabh}ffe"Ih Utejroold.ihg ppera< V.thSn, advatjci|igt.|(. f^f0ier'tif the th/^jdirnerislonai' fully-cured p6toi6rs0T;t|^rriald^l articfe' "Second,' KCI'i ffjrad.ucts have. IIWeAf rio.torp . dency to set yp or freeze" \n 'the injection, machinb barrel. If the,products dld.have a tendency .to build up in the cylinder of an Injection machine, they would dor so in RCI's extruders and could hot be processed* This is assurance to the moider that he can expect continuous troubie-frep performance. "Third, RCI injection materials cen be held for an exceptionally long time after plasticizing in an injection cylinder and .still flow out and fill a maid. For example, RCI 25000 has been held in a plasti cized state at 240"F for three minutes and after this long delay, still filled a tO-cavity mold when It was injected. `^Ih : Sri'extnidepft Is-, necessary to formulate to preyefit-buli^ lip On' th'ersieel to thd extruder: This idea b Compatible with good mold release'or freedom from stipking-To the steel molds. On the other hand, with a two-rolf mil! formulations must be adjusted so that, they will stick, to the steel roils, but not stlok to the steel' rholds. These Ideas are incompatible. RCI's extruded materials have proven themselves to be the best for mold release. - Faster core speed is always accompanied by a loss in molding latitude and slower cure speed is always accompanied by a gain in molding latitude. In other words, molding latitude and cure speed are on opposite sides of the scale and ddo is gained at the expense of the other. The RC( extrusion process inher ently moves the scale of molding latitude versus cure speed upwards; so that while the relationship of cure speed and molding latitude still exists, both of. these properties are improved simultaneously. Two exam "Fourth, RCI materials are formulated to extrude ples of the application of these inherent advantages uniformly based on work input and thermal history. were related in the foregoing article. RI-00030