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