NANOTECHNOLOGY IN PRACTICE: IMPROVING MACHINE PERFORMANCE IN A NEWSPRINT MILL

摘要

The use of microparticle retention systems has become increasingly important in the past decade.rnMicroparticle systems tend to give better retention, drainage, and formation than do conventional polymerrnretention systems. The small, tight flocs, which form with the aid of microparticle retention aids and adsorbrnstrongly to the fiber furnish components, create a more open and uniform sheet structure in paper. Sincerntheir introduction a number of years ago, microparticle systems have consisted mostly of two types, silica -rncationic starch based, or bentonite - polyacrylamide based. In the last few years, a number of otherrncompeting technologies have been developed and used successfully.rnPapermakers have continued to seek more advanced technology that would allow them to meet stringentrnrequirements for formation and opacity in lightweight fine paper grades as well as superior retention ofrnfillers and fines. For heavier weight grades of paper and paperboard, increased or high response drainage isrnoften key to keeping up consistent machine speeds withoutrnsacrificing paper and paperboard properties.rnThis paper will present a newsprint case study using an engineered colloidal technology. We will presentrnthe benefits associated with the use of this technology. Areas discussed will be wet-end chemistry, on-linernfirst pass retention control, process stability, and impact on paper quality.