NAVIGATION MEMBERS COURSE REGISTER DEMO

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) The unit of measurement for pad hardness is? Newton Micron Shore Rockwell

2) A flat pad is better than a pad with an angle? True False

3) A hard pad will give a better printed image than a soft pad. True False

4) Which is the most reliable method to mix ink? Weigh the ink and thinner Measure the viscosity Mix the ink and thinner using your own judgement Get someone else to do it for you

5) Using a sealed ink cup means that you only need to change the ink when you need to change the colour. True False

6) How hard is a (thick) steel plate? 62 – 64 Rockwell C 62 – 64 Shore A 100 microns 100 RZ

7) Which of the following plastics require pre-treatment? Polypropylene Polycarbonate Polyethylene Polystyrene

8) What are the methods of pre-treating plastics? Flaming Dip in thinner Corona discharge Bake in an oven

9) The unit measurement of surface tension is? RZ Microns Dynes/cm Newton/cm

10) Which of the following statements is correct? Pad printing works by the evaporation of the solvents More pad pressure is better Pad printing is best for printing large areas of solid colour

11) The etch depth of a plate with an open etch is? 25 microns 25 newtons 32 microns 32 newtons

12) The main elements of the pad printing process are? Pad, ink cup/doctor blade, plate, ink, machine Pad, ink cup/doctor blade, thinner, operator, machine Pad, ink cup/doctor blade, machine, plate

13) Two component ink, that is ink mixed with a catalyst will last for several days in a closed cup. True False

14) If the printing pad does not initially pick up ink it is recommended to gently rub the surface with fine abrasive paper soaked in thinners. True False

15) If the temperature drops in the print shop and the ink doesn’t transfer properly what is the first thing you should try? Add retarder Slow the print cycle Add thinner Speed up the print cycle

16) How do you get ink splashes off your hands? Carefully removed with a tissue moistened with thinners Remove excess with a tissue or cloth and wash with hands with soap and water Place a pad of methylated spirits on the ink for two minutes and then wipe with a dry cloth or tissues

17) What happens to printing solvent fumes when in still air? The rise to the ceiling They float in mid air They sink to the floor

18) What type of plate will hold (resolve) the finest line thickness when exposed? Thin steel plates Photopolymer plates Thick steel plates Mechanically engraved thermoset plastic

19) If the temperature increases in the print shop and the ink doesn’t transfer properly what is the first thing you should try? Add retarder Slow the print cycle Add thinner Speed up the print cycle

20) What is the ideal action of the printing pad surface across the plate? Rocking Rolling Squeezing Sliding Pushing

21) If you wanted to choose a plate material for finer detail and long life which would it be? Photopolymer Thin steel Thick steel Mechanically engraved thermoset plastic

22) Which material has the lowest surface energy? ABS PVC Nylon Polypropylene

23) Why should the surface energy of a substrate be higher than the surface tension of the ink? So the ink can easily be removed if there is a fault To enable the ink to cure correctly To allow the ink to wet the substrate To ensure that there is no colour change of the printed ink film

24) What are the likely causes of wisps of ink spreading from the printed image? Ink too thin Ink too thick Etch depth too deep Excessive charge of static electricity

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