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PSE 322 Final Exam Questions and Correct
Answers/ Latest Update / Already Graded
ASA properties
Ans: sizing additive
reacts really fast
liquid at room temp
AKD properties
Ans: less reactive
waxy solid at room temp
Starch properties
Ans: low cost
good H-bonding
makes paper stiff
microscopic parts
What is the first thing you have to do to starch before using it?
Ans: cook it
(helps utilize its best strength performance)
How long does it take to fully cook starch?
Ans: 20 minutes
If ____ isn't cooked it acts like a ____
Ans: starch
filler
Two ways to cook starch
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Ans: batch cooking
jet/continuous cooking
What happens if cooked starch sits?
Ans: Subject to retrogradation
(will crystallize)
What two things does paper strength depend on?
Ans: 1.) strength of individual fiber
2.) strength of bonds between them
Amylose properties
Ans: vulnerable to retrogradation
linear
Amylopectin properties
Ans: branched
dense
does not retrograde
Why does amylopectin resists retrogradation?
Ans: it's branched
What two things do we want wed end starch to have?
Ans: higher molecular mass
cationic charge
Basic ways to increase dry strength
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Ans: increase refining
use strength agent
Tissue tear properties
Ans: very weak paper
few fibers break
low refining
Tracing tear properties
Ans: well bonded paper
many fibers break
highly refined
RBA is based on what? (two things)
Ans: Tensile strength
# of fibers broken
Consequences of refining (4 things)
Ans: interfiber bonding
slower drainage
denser, thinner paper
decreased tear strength
RBA Equation
Ans: (s_unbonded - s_bonded)/s_unbonded
RBA can be found by what optical criteria?
Ans: Scattering coefficient
PSE 322 Final Exam Questions and Correct
Answers/ Latest Update / Already Graded
ASA properties
Ans: sizing additive
reacts really fast
liquid at room temp
AKD properties
Ans: less reactive
waxy solid at room temp
Starch properties
Ans: low cost
good H-bonding
makes paper stiff
microscopic parts
What is the first thing you have to do to starch before using it?
Ans: cook it
(helps utilize its best strength performance)
How long does it take to fully cook starch?
Ans: 20 minutes
If ____ isn't cooked it acts like a ____
Ans: starch
filler
Two ways to cook starch
, 2 | Page
Ans: batch cooking
jet/continuous cooking
What happens if cooked starch sits?
Ans: Subject to retrogradation
(will crystallize)
What two things does paper strength depend on?
Ans: 1.) strength of individual fiber
2.) strength of bonds between them
Amylose properties
Ans: vulnerable to retrogradation
linear
Amylopectin properties
Ans: branched
dense
does not retrograde
Why does amylopectin resists retrogradation?
Ans: it's branched
What two things do we want wed end starch to have?
Ans: higher molecular mass
cationic charge
Basic ways to increase dry strength
, 3 | Page
Ans: increase refining
use strength agent
Tissue tear properties
Ans: very weak paper
few fibers break
low refining
Tracing tear properties
Ans: well bonded paper
many fibers break
highly refined
RBA is based on what? (two things)
Ans: Tensile strength
# of fibers broken
Consequences of refining (4 things)
Ans: interfiber bonding
slower drainage
denser, thinner paper
decreased tear strength
RBA Equation
Ans: (s_unbonded - s_bonded)/s_unbonded
RBA can be found by what optical criteria?
Ans: Scattering coefficient
