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Screen Printing
Skills USA Prep
| Question | Answer |
|---|---|
| True or False - Where light strikes the screen printing photo stencil, the emulsion of that photo stencil will harden and block in so it won't print in that area | True |
| True or False - Squeegee pressure has little affect on ink thickness if your image carrier is properly prepared. | False |
| True or False - The angle of the squeegee during printing can affect the amount of ink deposited on the substrate. | False |
| T/F A sharp, square-edged squeegee blade will print a heavier ink deposit than a rounded-edge squeegee blade. | False |
| T/F The emulsion side of film or vellum positive, correctly made for use in exposing a direct emulsion photographic right reading. | True |
| T/F The following steps in reclaiming the screen after printing are in proper sequence: remove ink, wash out stencil, degrease. | True |
| T/F It is best to clean the ink from the screen immediately after printing, as well as remove the stencil, if that stencil is not going to be used again. | True |
| T/F The operator of a high pressure wash out unit should wear eye protections. | True |
| T/F The block out applied around the photo stencil is normally water based. | True |
| The major consideration for coating a fabric mesh with direct liquid emulsion is | Apply a uniform coating |
| What is the main purpose of the screen frame used in screen printing? | To hold the screen mesh at proper tension |
| What press material/component pushes ink through the screen? | Squeegee |
| The largest market for screen printing | Textiles |
| Which squeegee shape will lay down the thickest ink layer | Round |
| How is the flexibility or hardness of a squeegee measured | Durometer |
| What is the best type of squeegee blade to use? | It depends on the printing job |
| Which type of screen fabric is very stable, is a good general purpose fabric and is most widely used today? | Polyester |
| Which variable is going to impact ink film thickness the most? | Mesh selection |
| Things that impact the ink film thickness include: | Stencil selection, squeegee angle, and mesh count |
| Which type of screen mesh, because of its elasticity, is good for printing on irregular objects like bottles and glasses | Polyester |
| When printing fine detail, the fabric mesh should be a... | High numbered mesh |
| What is the measure of the fineness or coarseness of the mesh? | Mesh count |
| Which mesh count would be appropriate to use in the case of printing large, bold, numbers onto sports jerseys | 85 |
| What is the property of ink that indicates its resistance to flow | Viscosity |
| What type of ink is generally used to screen print on t-shirts | Plastisol inks |
| How do you select the proper ink to use when screen printing on different materials? | By running tests |
| What is the proper temperature at which to cure plastisol ink | 450 |
| What is a small but proportionate drawing, as a result of the brainstorming of ideas of the final job | Thumbnail |
| The piece of film/vellum, used to create the stencil on a screen that is used to screen print, needs to be emulsion: | Right Reading, Positive |
| T/F Screen printing is the process of transferring an image from a flat surface | False |
| What type of product is generally printed on a carousel press | Tshirts |
| Screen tension is measure in | Newtons |
| In screen preparation, what is the process of removing any contaminates, solvents, or dust from the screen mesh | Degreasing |
| Emulsion is applied directly to the screen with a/an | Scoop coater |
| What is usually used to seal the screen mesh surrounding a stencil | A screen filler/Block out |
| What is done to a screen using direct emulsion or capillary right after it has been exposed | The image is washed out |
| Off-Contact distance between the screen and pallet should be | 1/8" |
| The side of the screen in which the ink goes is referred to as | Squeegee side |
| When trying to determine the emulsion side of an exposed piece of film, what are typical indicators | Right reading type, dark areas scratch, dull finish |
| After washing out the image on an exposed screen, you should | Use pressurized air to blow off excess water |
| When cleaning up plastisol ink, you should... | Wear gloves, use solvents, wear eye protection |
| When handling emulsion and unexposed coated screens you work under | Safe lights |
| Factors that effects screen exposure include | Reclaiming technique, coating technique and brand of emulsion |
| What is a screen exposure calculator | A piece of photo positive film that has a series of objects with various densities of neutral gray filters |
| Stencil breakdown during printing can be caused by | Stencil underexposure |
| When the image will not completely develop when using the direct emulsion method, one cause may be | Overexposure |
| In order to allow the ink to be applied to the surface of the substrate, the squeegee pressure should be: | Kept to a minimum |
| What is flash curing | An intermediate point between liquid and total fusion of plastisol inks |
| When printing on shaped objects, the screen mesh needs to be | More flexible |
| What is one thing that determines the thickness of ink deposit in screen printing | Stencil |
| The process of stripping the stencil from the screen so that a new stencil can be applied is called | Screen reclamation |
| When reclaiming screens it is particularly important to pay attention to | Screen Mesh |
| All ink should be cleared off screen immediately after printing to | Avoid the use of chemicals and effort |
| Dust or dirt on the exposure unit glass can cause tiny holes in the stencil called | Pin holes |
| The type of screen fabric that is woven from threads made of single strand is called | Monofilament |
| Curing of plastisol ink is controlled by the temperature setting on the dryer and | Speed of the conveyer belt |
| Re-tensionable frames... | Can add tension after every use, must be assembled properly to use, do not warp |
| T/F Ink screen printing, the dark areas of the film or vellum positive during the exposure of a screen allows UV light to expose or harden the emulsion | False |
| T/F The hardness of a squeegee use in screen printing does not have an effect on the print quality | False |
| It is clear that screen printing's ability to _________ is an over-riding benefit when you look at the markets it serves. | Lay down a thick layer of ink |
| In screen printing, the ______ controls the quantity of ink deposited on the substrate and the "resolution" of the printed image | Mesh |
| The synthetic material in the frames is known as the | Screen Mesh |
| The shirt shaped boards on the screen press are known as: | Pallettes |
| What ink do professional screen printers use? | Plastisol |
| What device/tool forces ink through the stencil | Squeegee |
| How do you keep ink from one color from transferring to the back of another screen when printing a multi-color job? | Flash-cure unit |
| What is the recommended temperature and time for drying plastisol inks | 350 for 30 seconds |
| What are methods of attaching mesh to a frame? | Cord and groove, adhesive bonding, and stapling. |
| Screen printing is used to print: | Circuit boards, cups, t-shirts |
| Which mesh fabric is not a good choice for textile printing and is not an ideal candidate for reclaiming? | Silk |
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bhsgraphics
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