STENCIL MAKING EVALUATION 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.

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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