1)
Raise the exposing unit lid and wipe the glass
surface clean with a lint free rag.
2)
Position the screen with positive attached, onto the
glass and against the two back screen stops.
Do not position any screen outside screen area
indicated by the blue tape. Damage to vacuum
blanket can result.
3)
Lay the small string attached to the rear of the
exposing unit over the edge of the screen to assist in
achieving a good vacuum in the center of the screen.
4)
Lower the lid and lock closed with both handles.
5)
Turn on the power switch.
6)
Set the Vacuum Time. (See Tips).
7)
Set Exposure Time. (See Tips).
8)
Start Exposure Cycle. The vacuum pump will start.
After the vacuum timer has reached preset time the
LED lights will start. After the exposing time has ex-
pired, the lights and vacuum pump will automatically
shut off. The screen is now exposed.
9)
Unlock the lid to break the vacuum and remove the
screen.
Operation
Overview:
Your Exposing Unit is equipped with LED Lights, vacuum timer, exposure timer, vacuum
pump, and separate switches for main power and exposure cycle start.
The vacuum pump draws the air out from between the blanket and glass. This flattens the
coated screen and positive to the glass making for a sharper exposed image.
Timers are factory set to a 5 minute scale. Mode selector in lower right corner is set to
B. Typical vacuum time is just under 1 minute. For Exposure tips, please see below.
Sequence of Operation
Tips
Vacuum Time:
(for each size screen)
Place desired size blank screen properly onto the
glass. Lock lid and set vacuum time to 1.5 minutes.
Start cycle and record the time it takes to flatten the
blanket to a size larger than your positive. If unsure,
wait until blanket is flat to within 2” (5cm) of frame.
Exposure Time:
A full and complete exposure will be effected by
several variables listed by importance.
1) Type and brand of emulsion
2) Thickness of stencil (qty. of coats or capillary
film thickness)
3) Mesh color
4) Humidity
For this reason the only proper way to determine the
correct time for a full and complete exposure is to use
a “Exposure Calculator”. Several types of calculators
are available, contact your supplier to determine
which is best for you.
Approximate setting for single part or “Pure Photo-
polymer” is: 10 – 30 seconds.
Approximate setting for “Dual Cure”: 1 – 5 minutes.
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