Search Results

You are looking at 1 - 10 of 90 items :

  • "Filler retention" x
Clear All

Filler retention and the specific surface area of fibres S. R. Middleton and A.M. Scallan, Pulp and Paper Re Canada Keywords: Filler, Fiber, Titanium dioxide, Retention, Sur- faces, Filler retention, Adsorption, Wood species, Bleached pulps, Monolayers. SUMMARY: Good retention of filler by chemical pulp fibres is associated with fibres of high specific surface area and thus with fibres derived from wood species having thin cell walls. I t is also shown that the increase in retention caused by beat- ing is due to the increased surface area of the fibres

8TH INTERNATIONAL PAPER AND COATING CHEMISTRY SYMPOSIUM 2012 Nordic Pulp & Paper Research Journal Vol 28 no (3) 2013 458 The effect of anionicity and feed strategy on filler retention and agglomeration Emmi Kallio, Petteri Paananen, and Jari Käyhkö KEYWORDS: Dispersion agent, Dispersant, Filler retention, Feeding strategy SUMMARY: With the help of new feeding methods, retention chemical and filler can be injected to stock flow at the same location. The aim of this study was to clear out how anionicity of the filler and pulp affects on the retention

188 Nordic Pulp and Paper Research Journal Vol 16 no. 3/2001 Keywords: Filler retention, Model, Microparticle, Bridging, Wet-end, Papermaking, Poly(acrylamide), Bentonite, Control SUMMARY: A model predicting filler retention from collision efficiency was developed and validated with a mill trial. The col- lision efficiency model for retention systems consisting of a high molecular weight polymer and microparticles was modified to include two different particles (fiber and filler) and the effect of polymer transfer. The collision efficiency is a function of the

Partial lumen loading Steven R. Middleton and Anthony M. Scallan, Pulp and Paper Research Institute of Canada, Pointe Claire, P.Q, Canada Keywords: Lumens, Pulps, Fillers, Titanium dioxide. Filler retention. SUMMARY: Prolonged mixing of a pulp with a titanium diox- ide filler at a conventional level of addition can result in the loading of a fraction of the filler within the fibre lumens. Under certain conditions, as much as 50% of the filler charge may be so loaded. This simple treatment results in a significant increase in the average tenacity by

Special Issue: NANOCELLULOSE Nordic Pulp & Paper Research Journal Vol 29 no (1) 2014 119 Flocculation and retention of fillers with nanocelluloses Markus H.J. Korhonen, Janne Laine KEYWORDS: Nanofibrillar cellulose, Flocculation, Charge density, Filler, retention SUMMARY: The objective of this study was to examine the effect of different cellulose nanofibrils (CNF) on the flocculation and retention of precipitated calcium carbonate (PCC) and kaolin. Of particular interest was the study of how charge modifications of CNF affect its flocculation and

3 filler on the paper sheets are low and most of the CaCO 3 filler particles transfer from the pulp slurry to drainage through a papermaking wire. The retention value of the CaCO 3 filler on the paper sheet can be controlled by addition of retention-aid polymer(s), such as cationic or amphoteric polyacrylamides and starches. In the CaCO 3 filler/retention-aid system, heterogeneous CaCO 3 aggregates are unevenly distributed on the pulp fiber surfaces, resulting in the added CaCO 3 filler efficiently improving the optical properties of the paper sheets

PAPER CHEMISTRY Nordic Pulp & Paper Research Journal Vol 30 no (2) 2015 243 The effect of pre-flocculation of lime mud by wet-end additives on paper properties Yuan Peng, Beihai He, and Lihong Zhao KEYWORDS: Lime mud, Pre-flocculation, Filler retention, Paper strength, Optical properties, Paper formation SUMMARY: The presence of filler in cellulosic paper usually decreases the paper strength, which has been limiting the filler loading beyond a critical level in papermaking process and increasing production cost accordingly. In order to increase

Particle deposition on pulp fibers The influence of added chemicals Theo G. M. van de Ven, Paprican and Department of Chemistry, Pulp and Paper Research Centre, McGill University, Montreal, Canada Keywords: Particle collisions, Retention aids, Filler retention, Kinetics, Flocculation, Deposition, Chemicals, Particles, Fib- ers, Fines, Fillers, Pulps. SUMMARY: Many chemicals added to a papermaking suspen- sion are of a polymeric nature and affect the interactions be- tween fibers, fines and fillers. Optimization of fines and fillers retention is

515Nordic Pulp and Paper Research Journal Vol 15 no. 5/2000 Keywords: Fines retention, Filler retention, Microparticulate retention aid systems, Fiber flocculation, Kinetics of deposition, Bentonite, Polyacrylamide, Montmorillonite SUMMARY: The use of microparticulate retention aids was investigated in three different papermaking systems: the deposi- tion of PCC on kraft fibers, flocculation of TMP fibers and the deposition of fines on TMP fibers. It is shown that montmorillo- nite significantly increases both particle deposition and fiber floc- culation. This is

results in loss of paper strengths due to the fact that filler particles interfere fiber-fiber bonding (Koivunen et al. 2010 , Seo et al. 2012 ). Furthermore, increasing the filler content in the stock of papermaking tends to reduce the filler retention in the system, which decreases sizing efficiency, causes more wire abrasion and linting/dusting problems (Lee et al. 2006 , Shen et al. 2010 ). In order to increase the use of filler while avoiding the negative effect of filler on paper strengths, various filler modification methods have been explored (Shen et al