On Stock Properties Of Light Weight Coated Base Paper

With the development of paper industry, more and more attentions havebeen paid to produce high quality paper cost effectively. So coated paper entersthe fast develop time, especially light weight coated paper (LWC). LWC is akind of high grade printing paper with less basis weight and coated layer.Usually it contains a portion of mechanical pulp, and is widely used in offsetprinting and gravure printing.This paper mainly deals with LWC base stock properties applied for LWC,in order to make stocks cost effectively, DIP is added to raw stocks. Beatingproperties of NBKP, APMP, CTMP and DIP have been separately researched.Then carrying out four furnish handsheet making experiments, obtaining the bestfurnish ar(e1)NBKP:APMP:DIP = 30:30:40;(2)NBKP:CTMP:DIP = 40:30:30,then on the base of best furnish, doing the experiments of choosing beatingdegree, the results are as follows: for(1), NBKP 44 oSR,APMP 50oSR,DIP 80oSR;basis weight is 39.3g/m2, bulk is 2.468cm3/g, breaking length is 3.956km,opacity is 87.8%, light scattering coefficient is 41.87m2/kg;for(2), NBKP is 44oSR,CTMP is 50 oSR,DIP 为 80oSR. Handsheet properties are as follows: basisweight is 43.8g/m2, bulk is 2.940cm3/g, breaking length is 3.453km, opacity is88.8%, light scattering coefficient is 39.41m2/kg.Beating changes fiber morphology parameters, so the influence of beatingon handsheet is determined by fiber morphology parameters. With beating, fiberlength, coarseness, curl index and kink index are lowered by different degrees.Influence of fiber length, coarseness, curl index and kink index on handsheetproperties has been researched. Results show, for the same stock, with beating,fiber is shorter, but breaking length increases;coarseness decreases, but breakinglength increases, opacity and light scattering coefficient decreases;curl and kinkdecrease, but breaking length increases.Finally, sizing and filling experiments were done as following experimentalconditions: adding 0.20% AKD, 1.8% CS, 0.03% PAM and 20% CaCO3, makehandsheets (1), (2). The results show: (1) bulk is 2.360cm3/g, breaking length is3.360km, opacity is 96.3%, light scattering coefficient is 67.97 m2/kg(;2)bulk is2.399cm3/g, opacity is 95.7%, light scattering coefficient is 68.62m2/kg, breakinglength is 3.213km.