PSE 322 Final Exam Questions with Detailed Verified Answers

Page | 1



PSE 322 Final Exam Questions with
Detailed Verified Answers

Question:ASA properties

Ans: sizing additive

reacts really fast

liquid at room temp

Question: AKD properties

Ans: less reactive

waxy solid at room temp

Question: Starch properties

Ans: 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?

Ans: cook it

(helps utilize its best strength performance)

Question: How long does it take to fully cook starch?

, Page | 2

Ans: 20 minutes

Question: If ____ isn't cooked it acts like a ____

Ans: starch

filler

Question: Two ways to cook starch

Ans: batch cooking

jet/continuous cooking

Question: What happens if cooked starch sits?

Ans: Subject to retrogradation

(will crystallize)

Question: What two things does paper strength depend on?

Ans: 1.) strength of individual fiber

2.) strength of bonds between them

Question: Amylose properties

Ans: vulnerable to retrogradation

linear

Question: Amylopectin properties

Ans: branched

dense

does not retrograde

, Page | 3

Question: Why does amylopectin resists retrogradation?

Ans: it's branched

Question: What two things do we want wed end starch to have?

Ans: higher molecular mass

cationic charge

Question: Basic ways to increase dry strength

Ans: increase refining

use strength agent

Question: Tissue tear properties

Ans: very weak paper

few fibers break

low refining

Question: Tracing tear properties

Ans: well bonded paper

many fibers break

highly refined

Question: RBA is based on what? (two things)

Ans: Tensile strength

# of fibers broken

Question: Consequences of refining (4 things)