Mechanism of polyacrylamide-bentonite – microparticulate retention aids

2000 ◽  
Vol 15 (5) ◽  
pp. 515-519 ◽  
Author(s):  
Tom Asselman ◽  
Bob Alince ◽  
Gil Garnier ◽  
Theo G.M. van de Ven
Keyword(s):  
Retention Aids

A pilot web former designed to study retention-formation relationships

2010 ◽  
Vol 25 (2) ◽  
pp. 185-194
Author(s):  
Anna Svedberg ◽  
Tom Lindström
Keyword(s):  
Pilot Scale ◽  
Operating Conditions ◽  
Montmorillonite Clay ◽  
Speed Ratio ◽  
Good Reproducibility ◽  
Total Solids ◽  
Retention Aids ◽  
Solids Content ◽  
Relationship Of ◽  
The Relationship

Abstract A pilot-scale fourdrinier former has been developed for the purpose of investigating the relationship between retention and paper formation (features, retention aids, dosage points, etc.). The main objective of this publication was to present the R-F (Retention and formation)-machine and demonstrate some of its fields of applications. For a fine paper stock (90% hardwood and 10% softwood) with addition of 25% filler (based on total solids content), the relationship between retention and formation was investigated for a microparticulate retention aid (cationic polyacrylamide together with anionic montmorillonite clay). The retention-formation relationship of the retention aid system was investigated after choosing standardized machine operating conditions (e.g. the jet-to-wire speed ratio). As expected, the formation was impaired when the retention was increased. Since good reproducibility was attained, the R-F (Retention and formation)-machine was found to be a useful tool for studying the relationship between retention and paper formation.

Paper Making Furnish as a Composite Blend. Some Wet End Interactions among Furnish Ingredients

1990 ◽  
Vol 197 ◽  
Author(s):  
Joseph Marton
Keyword(s):  
Strength Loss ◽  
Accessible Surface Area ◽  
Strength Properties ◽  
Fiber Network ◽  
Cellulosic Fibers ◽  
Paper Making ◽  
Fibrous Network ◽  
Retention Aids ◽  
Accessible Surface ◽  
End Use

ABSTRACTC.A. Hogart defined paper as “a random bonded fibrous network carrying filler material“. A few thoughts related to this definition and pertaining to paper composites are presented.A typical papermaking furnish consists of a blend of cellulosic fibers and fines, inorganic fillers and additives. Composition varies according to end use requirements. The fiber network secures desired mechanical and strength properties, fillers contribute to esthetics and good optics. Filler retention is improved by using retention aids. Strength-loss due to filler, use is compensated for, by applying strength additives.Additives applied at the wet end interact with furnish components. The surface charge, accessible surface area and composition play a role in the interactions. Some typical interactions, involving cationic starch and polyacrylamide, are discussed.

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