Stencil Making Quiz

Please do not make a blind guess or randomly select the answers to these questions, as it is a measure of what you know, and not how lucky you are.

There are a total of 21 questions.

Good Luck!

 

1) Nowadays what is screen printing mesh made from?

Polyester
Polyurethane
Silk
Nylon
Steel

 

2) Which of these images is likely to be printed using a stencil that is produced with liquid emulsion that has a face coat applied?

 

3) The unit measure of tension is:

RZ
Shore
Microns
Newtons

 

4) Which of the following statements is correct?

Tension has very little effect on the print
A high tension is best
The best way to check if mesh tension correct is by bouncing a coin on it

 

5) In this example what does 140/355-34Y PW signify in a mesh specification?

140 microns/0.355� mesh opening - 34 microns thread diameter � yellow mesh � plain weft
140 threads per centimetre/355 threads per inch - 34 micron thread diameter � yellow mesh � plain weave
140 microns/0.355� mesh thickness - 34 microns mesh opening � yellow mesh � plain weft

 

6) Accepting that most meshes now are plain weave, what are the main characteristics of mesh that affect the ink deposit?

Mesh Count
Thread Diameter
Mesh Thickness
Mesh Weight

 

7) What is the hidden energy of the process?

Squeegee movement
Ink flow
Mesh tension
Mesh opening

 

8) Liquid emulsions and capillary film are:

Direct emulsions
Indirect emulsions

 

9) What does EOM stand for?

Emulsion on mesh
Emulsion overt mesh
Emulsion outside mesh
Emulsion over mesh

 

10) In the printed example what are the likely causes of the loss of definition on the second R? (These have been printed off different stencils)

Underexposed emulsion
Over exposed emulsion
Poor contact of photopositive with emulsion

 

11) If an emulsion is not dried sufficiently, when it is exposed will it be?

Over exposed
Under exposed

 

12) What will you see in a developed stencil that has not been dried sufficiently ?

Pinholes
Fisheyes
Water stains
Dust particles

 

13) When coating the mesh wet on wet on what side should the last coat be made?

Squeegee side
Print side

 

14) What instrument is used to measure the roughness of the stencil?

Spectrophotometer
RZ meter
Magnifying glass

 

15) Why is it important to have as flat stencil as possible?

To stop ink seeping out of the mesh
To stop the squeegee juddering while printing
To give good edge definition

 

16) Is it better to have a?

High RZ reading
Low RZ reading

 

17) The reason for coating the print side of the stencil after it has been coated and dried is to?

Make a thicker stencil
Improve the RZ
Stop the emulsion from breaking down
Fill in any pinholes

 

18) If the image on a photopositive is 1000 mm and the humidity increases by 1% rh what will be the effect on the image size?

The image will increase in size
Rh has no effect on the photopositive
The image will decrease in size
It depends how long the stencil is exposed for

 

19) What instrument is used to check the dot area and the density of the emulsion on the photopositive?

Reflection densitometer
Transmission tensiometer
Transmission densitometer

 

20) When printing 4 colour process what is the acceptable difference in tension between all four stencils?

+/- 1 Newton
Varying tensions don't make any difference
3 Newtons
+/- 1 Shore

 

21) Which flood coater profile would you use for printing four colour process?

 

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