The Production And Practice Research Of Carbonless Copy Base Paper

Bleaching straw pulp which adopt wet preparation and continuous digesting is better thanbleaching straw pulp of intermittent digesting in purity, whiteness and quality, and moreover thequality of poplar and straw mixed bleaching pulp is much more stable than bleaching straw pulp. Itis observed from analysis physical strength that the performance of poplar and straw mixedbleaching pulp is between bleaching poplar pulp and bleaching straw pulp.For using mixed pulp and imported conifer pulp as material and also adding liquid whitenessagent which is not tend to turn yellow, selecting direct dye which is imported withenvironment-friendly quality as well as high colour and fastness of solarization resistance andadopting neutral sizing and nano silicon particles technology in retention and drainage, the basepaper has high stable whiteness and brightness. The base paper is affluent in colour and have highquality in flexility, stiffness, strength and formation whithout warping, distortion and sideness so thatit is advantageous to handing coat layer.The result of study shows that cationic agent has good absorption to furnish but carbon dioxidehas the least absorption to chemicals while the pH value is 7.5 to 8.5 and moreover it is helpful toreduce activation energy in neutral sizing reaction. The modified sizing agent of surface strengthZSF-402 which is used with starch and surface sizing agent can improve surface picking strengthand printablity.The direct dye has high affinity to cellulose fibre so that the fibre is easy to be dyed with highfastness. Especially the imported dye of solarization resistance has fastness of 4-5 degree so that thebase paper not change color after coating. The chromogenic reaction of colourful carbonless copybase paper is fast and strong with clear and gentle colour as well as low cost while addingabove-mentioned dye to pulp directly in production. The APC-H liquid FWA has good capability ofdissolution and whitening and not turning yellow with high dosage.Particle retention system which selects a kind colloidal substance of Silicon-Alum complexacquired from acidification of aluminum sulfate and cationic starch which is added into pulp first issuitable for high shear force and forming tiny, compact and fast flocculation. When the dosage is at0.3ï¼…, retention and drainage rate of carbon dioxide is excellent.When the oxide starch is used with surface sizing agent D-1, it can achieve good waterresistance and film formation ability so that the surface strength of paper can be improved greatly. Italso ensure even absorption of dye in coating layer in the handing process of base paper so that thecopy function of carbonless copy base paper is improved too.Production practice has proved that with neutral papermaking and high effective microparticleretention and drainage technology as well as paper surface processing technology by syntheticsurface sizing agent, all physical index of carbonless copy base paper achieve or exceed nationalstandard and received good feedback after using of customers.