PSE 322 Chapter 11 - Starch and Dry Strength
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15 Terms
what is the main internal starch used?
cationic starch
what is the main surface starch used?
unmodified (native pearl) or hydroxyethyl
what is the typical dp of amylose?
1000-20000
what is the typical dp of amylopectin?
millions
what is the typical amount of cationic starch used in copy paper?
5-25 lb/ton
what is the typical dp of surface starch?
150-1300
what is the typical amount of surface starch added to copy paper?
50-100 lb/ton
what roles does cationic starch play?
strength, emulsifier and stabilizer for ASA size, essential part of some retention aid systems
what does zero-span tensile strength measure?
individual fiber strength
how does strength change with increased wet-pressing?
increases
what does cationic starch do?
increases the bond strength per unit of optically bonded area
with little mixing what is the impact of cationic starch on strength?
decrease in strength with increased cation starch
with intermediate mixing, what is the impact of cationic starch on strength?
zero net effect
with longest mixing time, what is the impact of cationic starch on strength?
increased strength with increased cationic starch
can cationic starch flocculate fibers?
yes