Deck 17: Coating Processes

Question 1

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 1

C

Question 2

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 2

A

Question 3

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 3

D

Question 4

In dip coating, the most common plastics used is ____.  

A) polyethylene
B) polyvinyl chloride
C) polypropylene
D) polyester

Question 5

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

Question 6

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

Question 7

Knife coating is often used to coat ____.   

A) paper
B) metals
C) Styrofoam
D) electrical components

Question 8

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

Question 9

Which material is commonly used in extrusion coating of various substrates? 

A) epoxy
B) polyester
C) PVC
D) ABS

Question 10

The process of coating a substrate with a plastics powder is sometimes called ____ painting.

A) dry
B) calendar
C) extrusion
D) transfer

Question 11

The following image shows tool handles coated by the process of ____.   

A) dip coating
B) knife coating
C) transfer coating
D) electrostatic powder gun

Question 12

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

Question 13

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

Question 14

One of the most critical factors in any coating operation is ____.  

A) water content
B) cooling
C) temperature
D) adhesion

Question 15

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

Question 16

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

Question 17

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

Question 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

Question 19

An advantage of calender coating is that ____.  

A) labor costs are low
B) no solvents are needed
C) equipment cost is low
D) coatings are stress-free

Question 20

Which process is similar to painting with a spray paint? 

A) electrostatic-bed coating
B) transfer-bed coating
C) electrostatic powder gun coating
D) fluidized-bed coating

Question 21

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

Question 22

This automotive headlight is coated by ____. 

A) vacuum metallizing
B) electroplating
C) laminated vapor plating
D) knife coating

Question 23

A familiar example of brush coating is (a) ____.  

A) handle of a tool
B) kitchen utensil
C) nail polish
D) None of the above

Question 24

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
D) knife coating

Question 25

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