Chemistry of pulp and paper making . edin a tank of the coating mixture and the excess is removed bysqueeze rolls. In either case _ the coating is immediatelysmoothed out and broughtinto good contact with thepaper by means of brushesworking across its surfacewith a reciprocating first of these brushes iscomparatively coarse, but theygradually become finer till thelast, which is very fine, toeUminate the marks made bythe first. The arrangementof this coating machine is in-dicated in Fig. 39. Afterleaving the brushes the paperpasses through a drying gal-lery heated by steam coils ora
Chemistry of pulp and paper making . edin a tank of the coating mixture and the excess is removed bysqueeze rolls. In either case _ the coating is immediatelysmoothed out and broughtinto good contact with thepaper by means of brushesworking across its surfacewith a reciprocating first of these brushes iscomparatively coarse, but theygradually become finer till thelast, which is very fine, toeUminate the marks made bythe first. The arrangementof this coating machine is in-dicated in Fig. 39. Afterleaving the brushes the paperpasses through a drying gal-lery heated by steam coils ora current of hot air and whenthoroughly dry is reeled upready for calendering. Theamount of coating appKed bythis process varies with thepurpose for which the paperis made and may be anythingfrom a wash coat up to 35 percent of the weight of the fin-ished paper. According to thetype of coating machine used,both sides may be coated atone operation with the samecolor or each side may becoated separately with thesame or different
Size: 1199px × 2084px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1920
