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Screen Printing Evaluation 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 35 questions. 1) What are the advantages of screen printing? It is an engineering process. It is controllable. It is a Black Art. It is measurable. It can print a wide range of inks or mediums. It can print film thickness from 2 Micron to 300 Micron. It doesn’t require a lot of skill.
2) What is the definition of printing? Redo the original artwork and lay down a controlled thickness of ink. Replicate the original artwork and lay down a contoured thickness of ink. Replicate the original artwork and lay down a controlled thickness of ink. Replicate the original artwork and lay down a contrived thickness of ink.
3) Why was screen printing initially known as silk screen printing? Because silk was used to make the mesh/screen. Because it was used to print onto silk.
4) Which one of the following statements is correct? The screen printing process is made up of the basic items: Stencil, Squeegee, Ink, Substrate, Machine. The screen printing process is made up of the basic items: Stencil, Squeegee, Printer, Substrate, Machine. The screen printing process is made up of the basic items: Stencil, Vacuum Bed, Ink, Substrate, Machine. The screen printing process is made up of the basic items: Stencil, Squeegee Sharpener, Ink, Substrate, Machine.
5) What is the primary purpose of the flood coater? To cover the screen with ink. To charge the mesh openings with ink. To bring the stencil into contact with the substrate. To mix the ink.
6) Select all the correct statements with regard to the functions of the squeegee. The squeegee creates a wave in the ink that is a pressure system. The squeegee pressure forces the ink through the mesh. The tip of the squeegee displaces ink in the mesh openings that has already been pushed there by the flood coater. The squeegee brings the stencil into contact with the substrate. The squeegee mixes the ink. The squeegee removes any excess ink left on the stencil.
7) If the stencil tension is low the snap distance or off contact has to be: Low. High.
8) Which one of the following statements is correct? The ink deposit is mainly controlled by: Mesh Count, Thread Diameter, Mesh Weave. The ink deposit is mainly controlled by: Squeegee Pressure, Stencil Thickness, Mesh Count. The ink deposit is mainly controlled by: Stencil Thickness, Snap Distance, Mesh Weave. The ink deposit is mainly controlled by: Thread Diameter, Mesh Weave, Stencil Thickness.
9) Why is it sometimes necessary to condition the substrate? To stabilise the substrate dimensionally so that when it is actually printed and dried there is no further movement that could affect registration. Warming the substrate prior to printing helps the ink flow better. If you have problems with registration you can use it to change the substrate size and get a better fit. Conditioning the substrate helps the ink adhesion.
10) Which of the following statements about ink are correct? UV ink can be affected when on the stencil by the UV in daylight. Ink should be thinned at the machine. You only need to keep the lids on the ink when it is in the store room. Keeping the lids on ink containers stops the ink becoming contaminated with dust, etc. You should always read the Technical and Material Safety Data Sheets (MSDS) before using an ink.
11) Which of the following instruments should be used when checking a first off print? Ruler to check positioning of the image. Densitometer to check four colour process ink densities and dot gain/loss. Pantone colour chart. Ink Material Safety Data sheet. Snap wedge. Gloves. Light viewing box. Proof or sample. Tensiometer.
12) Whose responsibility is Health & Safety in the work place? The employer. The employee. Everyone's. Health & Safety Executive.
13) How often should you clean your hands with solvents? As required. At the end of your shift. Never. Before lunch and at the end of your shift.
14) Which of the following statements are correct? The squeegee should not be sharpened/dressed for 24 hours after removing from the press. A soft squeegee will put down more ink than a hard squeegee. Too much squeegee pressure can stretch the image. Squeegees are made from rubber. Too much squeegee pressure can damage the squeegee edge.
15) What is the purpose of the flood coater? To keep the ink mixed. To charge the mesh openings with ink. To stop the ink drying in the stencil. To cover the image on the stencil with ink.
16) How should you set the flood coater if you want to accurately control the ink deposit? In contact with the stencil. With a gap between the flood coater and the stencil. Use a sharp profile flood coater. Use a round profile flood coater.
17) If you wanted to print a large area of solid colour what type of flood coater would you use? The flood coater would not have any effect on the type of image being printed. A flood coater with a slight bend in the centre. A flood coater with a round edge. A flood coater with a sharp edge.
18) Which of the following provide colour in the ink? Spectrum. Density. Resins. Pigments.
19) How should you measure additions to ink? By volume. By viscosity. By weight. By eye.
20) What percentage of solvents is there in conventional UV curing ink? 25% 20% 10% 0%
21) What is the difference between a thinner and a retarder? They have different viscosities. They evaporate at different rates. They are different colours. They come from different suppliers.
22) What is the instant curing process called that takes place when a UV curing ink cures? Photosynthesis. Photopolymerisation. Photoelectric. Photopolymer.
23) Which of these two colours printed with UV inks will cure faster?
24) What forms of dryers are there? Jet Dryer Stump Dryer Wicket Dryer U B Dryer Infra Red Dryer UV Dryer