Screen Printing

Topics: Ultraviolet, Vacuum, Light Pages: 11 (3600 words) Published: May 3, 2013
Exposure Unit Manual

Please Read Instructions Prior To Use





Table of Contents:
Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9-10 Page 11 Page 12 Page 13-14 Table of Contents Exposure unit setup and preparation Exposure times, Washout Block-out, Taping the screen Additional Exposure times/emulsions Troubleshooting- Screen exposure variables Troubleshooting- Over/Under exposure Step Wedge Test- finding exposure times Analog Timer Instructions Digital Timer Instructions Ballast replacement


Set-up of the UV Exposure Unit and Preparation of the Screen Room A light safe environment consists of a room blocked out from UV Rays; in a light safe room you can setup your Ryonet UV Exposure Unit. Place on a flat surface about waist high, make sure it’s secure and plugged in. If it’s available use a 4x8” folding table or countertop. Keep the washout area away from the unit, use a shower curtain to prevent overspray in tight quarters. A light safe environment can have light safe bulbs such as yellow bug light bulbs. Fluorescent tube covers in yellow or clear will also block UV rays. If you do not have a dedicated darkroom, a bathroom with no windows or a room with dark blinds or Rubylith covering the windows will suffice. To find Rubylith visit the darkroom supplies page on

Step 1: Prep for exposure
Always clean your glass prior to exposing a screen. (For Compression Lid & Open Face Units make sure the foam that came with the unit is cut to fit the inside of your frames, trim if needed.) For X-VACTOR Vacuum Units: Always clean your glass prior to exposing a screen. For reclaimed frames that may have ink residue use a black muslin cloth to protect the vacuum blanket. Tape the enclosed rope to the glass where the vacuum fitting enters the blanket; place the rope into the frame along the edge and away from your film. This allows the vacuum to pull all the air out resulting in complete contact of film to screen. *NOTE: When unit arrives unpack and place on level surface, connect vacuum hose to nipple on blanket and tighten clamps. There are 8 exposure bulbs and 2 yellow safe lights; the safe lights go on the FAR ends of the unit, test bulbs before installing glass to ensure proper placement. For Compression Lid Units: When closing the compression lid the foam will press the coated screen tightly against the positive. This ensures a clean exposure with crisp edges. Lock lid down, set timer and expose according to tables provided in Figure 1. For Open Face Units: use a board cut to the size of the foam, place on top of the foam then weigh down evenly using 4 gallon containers or roughly 50-60lbs.) Set timer and expose according to tables provided in Figure 1. To prevent damage to your film positives, hang a box on the wall or have a basket near for films after exposing the screen. Remove tape and place film for aside for safe keeping and/or filing.

Step 2: Film Notes
You must insure that the image on your film is 100% opaque so NO light is allowed through the positive image area. Hold your films up to the light; you should not see ANY light through the image (black) area whatsoever. If light comes through the black area of the film, print another copy and stack them together or go over the films with a film opaque pen. If using a laser printer, you can also apply toner aid to enhance the darkness of the toner on the film. Films that are not 100% opaque may cause difficulties during washout.


Step 3: Exposure Time
Unfiltered black light (HUV) exposure tables expose coated screens by wavelength and strength of UV light. If you’re not using one of these light sources please check the advanced exposure guide later in this manual and the step-wedge instructions. After exposing you will see the image on the screen prior to washing out. We recommend using a Dual Cure Emulsion with...
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