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Chapter 17: Coating Processes
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1. It is important to select coating materials that are reasonably close to the ____ of the substrate to be coated.
a.
density
b.
thermal expansion
c.
molecular weight
d.
texture
ANSWER:
b
2. One of the most critical factors in any coating operation is ____.
a.
water content
b.
cooling
c.
temperature
d.
adhesion
ANSWER:
d
3. A technique in which a hot film of plastics is placed on a substrate and allowed to cool is known as ____.
a.
extrusion film coating
b.
transfer coating
c.
knife coating
d.
sputter coating
ANSWER:
a
4. Which material is commonly used in extrusion coating of various substrates?
a.
epoxy
b.
polyester
c.
PVC
d.
ABS
ANSWER:
c
5. What is an advantage of extrusion coating?
a.
labor costs are low
b.
no solvents are needed
c.
equipment is not costly
d.
the process is simple
ANSWER:
b
6. Melt-roll coating is a modification of ____, in which a preheated substrate is pressed into the hot melt by a rubber-
covered roller.
a.
extrusion coating
b.
knife coating
c.
calendering
d.
transfer coating
ANSWER:
c
7. An advantage of calender coating is that ____.
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Chapter 17: Coating Processes
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a.
labor costs are low
b.
no solvents are needed
c.
equipment cost is low
d.
coatings are stress-free
ANSWER:
d
8. The process of coating a substrate with a plastics powder is sometimes called ____ painting.
a.
dry
b.
calendar
c.
extrusion
d.
transfer
ANSWER:
a
9. In which process is a heated part suspended in a tank of finely powdered plastics—usually a thermoplastic?
a.
electrostatic-bed coating
b.
transfer-bed coating
c.
knife-bed coating
d.
fluidized-bed coating
ANSWER:
d
10. An advantage of fluidized-bed coating is ____.
a.
primer is not needed
b.
thin coatings are easy to control
c.
no solvents are needed
d.
continuous automation of line is easy
ANSWER:
c
11. In which process is a fine cloud of negatively charged plastics powders sprayed and deposited on a positively charged
object?
a.
electrostatic-bed coating
b.
transfer-bed coating
c.
knife-bed coating
d.
fluidized-bed coating
ANSWER:
a
12. What is a disadvantage of electrostatic-bed coating?
a.
the process is difficult to automate
b.
preheating is needed
c.
post-cure is generally needed
d.
there is a lot of over spray
ANSWER:
c
13. Which process is similar to painting with a spray paint?
a.
electrostatic-bed coating
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Chapter 17: Coating Processes
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b.
transfer-bed coating
c.
electrostatic powder gun coating
d.
fluidized-bed coating
ANSWER:
c
14. Examples of products coated with the both the electrostatic bed and the electrostatic powder gun process are ____.
a.
footwear
b.
tents
c.
awnings
d.
dishwasher parts
ANSWER:
d
15. An advantage of the electrostatic powder gun process is ____.
a.
the process is readily automated
b.
labor cost is low
c.
thickness is easy to control
d.
post-cure is not needed
ANSWER:
a
16. Which method produces a tough, leather-like skin on the fabric and is used in the manufacture of awnings, footwear,
upholstery, and fashion apparel?
a.
knife coating
b.
electrostatic powder gun
c.
transfer coating
d.
fluidized-bed coating
ANSWER:
c
17. Knife coating is often used to coat ____.
a.
paper
b.
metals
c.
Styrofoam
d.
electrical components
ANSWER:
a
18. A disadvantage of knife coating is that ____.
a.
it is a slow process
b.
thick coatings are not possible
c.
it is difficult to control thickness
d.
it is not justified for short runs
ANSWER:
d
19. In dip coating, the most common plastics used is ____.
a.
polyethylene
b.
polyvinyl chloride
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c.
polypropylene
d.
polyester
ANSWER:
b
20. The following image shows tool handles coated by the process of ____.
a.
dip coating
b.
knife coating
c.
transfer coating
d.
electrostatic powder gun
ANSWER:
a
21. An advantage of dip-coating is ____.
a.
relatively inexpensive equipment is used
b.
primers are not needed
c.
there is a long pot life
d.
coating thickness is easy to control
ANSWER:
a
22. Which process uses a finely ground powder blown through a specially designed burner nozzle of a spray gun?
a.
dip coating
b.
transfer coating
c.
flame coating
d.
knife coating
ANSWER:
c
23. In ____, a pre-plating step is accomplished by carefully cleaning the plastics part and etching the surface to ensure
adhesion.
a.
vacuum metallizing
b.
electroplating
c.
flame coating
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d.
knife coating
ANSWER:
b
24. This automotive headlight is coated by ____.
a.
vacuum metallizing
b.
electroplating
c.
laminated vapor plating
d.
knife coating
ANSWER:
a
25. A familiar example of brush coating is (a) ____.
a.
handle of a tool
b.
kitchen utensil
c.
nail polish
d.
None of the above
ANSWER:
c
