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Chapter 11: Extrusion Processes
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1. The word extrusion is derived from the Latin word extrudere, which means to ____.
a.
heat
b.
push
c.
form
d.
compress
ANSWER:
b
2. Screws are measured by their _____, from very small (19 mm) to very large (300 mm).
a.
length
b.
penetration
c.
barrel
d.
diameter
ANSWER:
d
3. A long screw provides more ____ than a short screw.
a.
mixing
b.
pressing power
c.
plastication
d.
heating
ANSWER:
a
4. The material is ____ as it goes through the transition section of the screw.
a.
fed
b.
extruded
c.
melted
d.
mixed
ANSWER:
c
5. The process of blending basic plastics with plasticizers, fillers, colorants, and other ingredients is called ____.
a.
injecting
b.
compounding
c.
curing
d.
plasticating
ANSWER:
b
6. Most extruded products other than pipe, film, sheet, and filaments are formed by ____ extrusion.
a.
pipe
b.
film
c.
profile
d.
sheet
ANSWER:
c
7.
In profile extrusion, to produce exact cross-sectional dimensions after the extrudate has cooled, allowances must be made
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Chapter 11: Extrusion Processes
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in the ____ design.
a.
barrel
b.
screw
c.
blower
d.
orifice
ANSWER:
d
8. In pipe extrusion, what forms the inside of the pipe?
a.
a mandrel
b.
a spider
c.
a tube
d.
a screw assembly
ANSWER:
a
9. What is the major difference between film extrusion and sheet extrusion?
a.
types of extrudate
b.
processing time
c.
thickness
d.
cooling time
ANSWER:
c
10. A prominent use of calendered film is in the ____ industry.
a.
aeronautic
b.
medical supply
c.
automotive
d.
textile
ANSWER:
d
11. Calendering is the preferred method of producing ____ sheets at high rates.
a.
epoxy
b.
PVC
c.
acrylic
d.
ABS
ANSWER:
b
12. What type of extrusion process is similar to inflating a balloon?
a.
blown-film
b.
calender
c.
sheet
d.
pipe
ANSWER:
a
13. Which sport is most closely associated with filament extrusion?
a.
hunting
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Chapter 11: Extrusion Processes
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b.
golfing
c.
fishing
d.
tennis
ANSWER:
c
14. When a thin film of molten plastics is applied to paper without the use of adhesives while paper and film are pressed
between rollers, it is known as ____.
a.
sheet extrusion
b.
pipe extrusion
c.
calendering
d.
extrusion coating
ANSWER:
d
15. Blow molding has been adopted from the ____ industry and modified for making one-piece containers and other
articles.
a.
glass
b.
metals
c.
automobile
d.
textile
ANSWER:
a
16. The largest disadvantage of extrusion blow molding is ____.
a.
controlling wall thickness
b.
the cost
c.
training personnel
d.
internal stresses
ANSWER:
a
17. An advantage of extrusion blow molding is ____.
a.
machine cost is low
b.
very little waste
c.
most thermoplastics may be used
d.
many shapes and die configurations are available
ANSWER:
c
18. A laminar bottle product can be formed by ____.
a.
cold parison extrusion
b.
co-extrusion
c.
sheet extrusion
d.
biaxial extrusion
ANSWER:
b
19. In this technical drawing, what is the name of the part indicated by the red arrow?
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Chapter 11: Extrusion Processes
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Name:
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Date:
Chapter 11: Extrusion Processes
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Page 5
20. The part of an extruder shown here is ____.
a.
feed section
b.
hopper
c.
head clamp
d.
breaker plate
ANSWER:
d
21. In ____ machines (pictured here), one screw wipes the material off the other one, allowing little material to pass
between the two screws.
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Chapter 11: Extrusion Processes
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a.
corotating twin-screw
b.
compounding single screw
c.
counter-rotating twin-screw compounding
d.
downstream feeding
ANSWER:
a
22. The extrudates at left are postformed into the shapes at right by being passed through____.
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Chapter 11: Extrusion Processes
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a.
dies
b.
rollers
c.
spiders
d.
orifices
ANSWER:
b
23. What is the process pictured here?
a.
blown-film extrusion
b.
film casting
c.
filament extrusion
d.
calendaring
ANSWER:
d
24. This graphic representation shows the various shapes of ____.
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Chapter 11: Extrusion Processes
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a.
filaments
b.
dies
c.
deniers
d.
spinnerets
ANSWER:
a
25. This graphic representation shows the process of ____.
a.
extrusion blow molding
b.
parison blow molding
c.
injection blow molding
d.
continuous-parison process
ANSWER:
c
