PCC Study Guide Questions with Verified
Correct Answers
When nylon is heat set before dyeing, the dye yield
decrease
Which sizes can be applied to a cotton fabric
Carboxymethylcellose (CMC), Polyvinyl alcohol (PVA), Starch
Which fiber types are bleached with sodium peroxide (Na2O2)?
Wool and silk
What is the typical pH for wool scouring with mild alkali
8-9
Chemical concentration is commonly reported as %OWB
continuous
How does singeing affect the dyeing and printing quality of fabric
it leads to higher quality prints
what does stabilizer do
controls the rate of bleaching reaction
What is NaOH
sodium hydroxide- activates the bleaching agent and raises the pH
what wet process is NaOH used in
Mercerization or scouring
, Na2CO3
sodium carbonate
What wet process is Na2CO3 used in
scouring
H2O2
hydrogen peroxide- bleaching agent
What wet process is hydrogen peroxide used in
bleaching
NaClO2
sodium chlorite
what wet process is sodium chlorite used in
bleaching
True or false- Thermoset fibers can be heat set
False
Mercerization and carbonization can be done in one process because they are both done
in acidic conditions
False
Optical Brightening Agents (OBAs) function as a permanent chemical substitute for the
bleaching process because they destroy colored impurities within the fiber
False
Correct Answers
When nylon is heat set before dyeing, the dye yield
decrease
Which sizes can be applied to a cotton fabric
Carboxymethylcellose (CMC), Polyvinyl alcohol (PVA), Starch
Which fiber types are bleached with sodium peroxide (Na2O2)?
Wool and silk
What is the typical pH for wool scouring with mild alkali
8-9
Chemical concentration is commonly reported as %OWB
continuous
How does singeing affect the dyeing and printing quality of fabric
it leads to higher quality prints
what does stabilizer do
controls the rate of bleaching reaction
What is NaOH
sodium hydroxide- activates the bleaching agent and raises the pH
what wet process is NaOH used in
Mercerization or scouring
, Na2CO3
sodium carbonate
What wet process is Na2CO3 used in
scouring
H2O2
hydrogen peroxide- bleaching agent
What wet process is hydrogen peroxide used in
bleaching
NaClO2
sodium chlorite
what wet process is sodium chlorite used in
bleaching
True or false- Thermoset fibers can be heat set
False
Mercerization and carbonization can be done in one process because they are both done
in acidic conditions
False
Optical Brightening Agents (OBAs) function as a permanent chemical substitute for the
bleaching process because they destroy colored impurities within the fiber
False
