VASTEX E2-CTS-2536 Manuel utilisateur
CTS Exposing Unit, LED
Contents Page#
Introduction, Machine Specifications 2
Safety Information 3
Operating Instructions 4-6
Troubleshooting 7-8
Emulsion Tips 9-10
01-00-005 Warranty 11
Doc # 01-04-035
Serial Number:
(Please log your machine's serial number and date of purchase for future reference.)
Date:____/____/______
VTX
Vastex International, Inc.
7 Emery Street
Bethlehem, Pa. 18015 USA
Phone# 610 625-2702 Fax# 610 625-2775
Web Site www.vastex.com
Authorized Representative in Europe:
Certification Experts BV
Nieuwstad 100 1381 CE Weesp,
The Netherlands
Tel : + 31 (0) 294 – 48 33 55
Fax : + 31 (0) 294 – 41 46 87
Vastex E-mail assistance
Purchasing & Product Info:
Electrical Support:
stech@vastex.com
Tech Support, Mechanical Setup, and Operation:
Operation Instructions
Year of Manufacture: 20____
Original Instructions
Electrical Drawing #: Revision:
Introduction
Vastex Exposing Units
(UV Exposure Systems)
Thank you for purchasing your printing equipment form Vastex International Inc.
Vastex has been designing and building printing equipment since 1960. We have
knowledge and experience, and are proud to supply the printing industry with quality
equipment at an affordable price. You can be confident your purchase will give you
years of trouble free service.
E2-CTS-2536
Overall Size
(lid closed)
Depth x Width x Height
20.5” x 31.6” x 56.4”
(52.1cm x 80.4cm x 143.2cm)
Weight 140 lbs (63.5 kg)
Screen Capacity 25" x 36"
Power Requirements 100V-125V: 60Hz @ 3.0 Amps
200V-240V: 50/60Hz @ 1.5 Amps
Control Board PCB P/N 04-01-137
Light Source LED BAR
P/N: 04-08-054
Power Supply P/N: 04-08-055
Floor Model/Tabletop Standard: Floor Model
Warranty 3 years
Machine Specifications & Part Numbers
Essential Characteristics of tools which may be fitted to this machinery:
This equipment is not designed to be used with any additional attachments or
tools, other than as specifically listed in this manual.
Pg.2
Intended Use:
This equipment is intended for the purpose of exposing screens and films with UV light
in conjunction with UV sensitive emulsions.
Safety:
The operator should read and understand this manual before operating this
equipment. Store manual and safety information near equipment for easy
access to operators.
Never leave equipment unattended while in operation.
Children and pets must be kept clear of the work area.
Do not store any objects on top of the exposing unit.
Unplug power cord before entering control box.
Do not operate if any guard or cover has been removed.
Do not operate if power cord is damaged.
Safe Operating Temperature (Ambient): 55°F-100°F (13°C-38°C)
Do not attempt to defeat safety interlocks.
Noise and Vibration: This noise level produced by this equipment does not exceed
70 dB(A).
General Information
UV Lights are used in this machine. The lights should Not Be viewed during
operation without eye protection.
Safety
Tools Required
Flat head screw driver or 1/4” nut driver
Pg.3
Operation
Overview:
Your exposing unit is equipped with UV lights and a touchscreen to digitally
control the exposure time on your screens.
Power switch
Touchscreen controls
Control Panel
Sequence of Operation:
1) Adjust upper and lower screen tray with knobs
located on each side of the machine.
2) Insert screen onto tray centered in front of UV
lights.
3) Turn on control panel and set exposure time.
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
Photopolymer” is: 10 – 30 seconds. (LED)
Approximate setting for “Dual Cure”: 60 – 300
Seconds. (LED)
Adjustment knob
Pg.4
Operation Cont’d
Touchscreen Controls
Set your exposure cycle by selecting either
ENTER TIME or SELECT PRESET on the home
screen. Your machine has the ability to save
and recall up to 10 presets, storing exposure
times.
Setting the exposure time:
1) From the setup screen press the number
under the label EXPOSURE .
2) Enter a time from 0-999 seconds.
3) Press DELETE enough times to enter the
desired time.
4) Press ENTER to confirm selection.
Running an exposure cycle:
1) From the setup screen, select RUN to start
the exposure cycle.
2) The remaining exposing time is shown on
the run screen.
To end the cycle at any time, select
CANCEL. Pressing CANCEL will return to
the setup screen.
3) After completing a cycle, EXPOSURE
COMPLETE will be displayed. Press OK to
return to the setup screen.
Home Screen
Setup Screen
Exposure Screen
Press to enter time
Return to home screen
Press to run
Press to save preset
Run Screen
Pg.5
Operation Cont’d
Saving settings as a preset:
1) On the setup screen, select SAVE
PRESET.
2) Select a letter to save the preset to.
Settings currently stored to the letter
selected will be shown on the right.
Confirm all settings before overwriting
a preset.
3) To cancel saving a preset, press the X
in the upper right corner.
Load Preset Screen
Save Preset Screen
Preset slot Return to setup screen
Settings currently
saved in selected
preset
Error messages:
EXPOSURE INCOMPLETE: POWER FAILURE
A power failure occurred during an exposure cycle. Loss of power to the unit or from
the power supply will trigger this error. If the error occurs during the exposing part of
the cycle, it is recommended to restart the exposure with a fresh screen.
Loading a saved preset:
1) From the home screen, choose
SELECT PRESET.
2) Select the desired preset.
Settings saved in the preset are
shown on the right side.
3) Select LOAD to load the desired
preset.
4) To return to the home screen, select
the X in the upper right corner.
Preset slot Return to setup screen
Settings currently
saved in selected
preset
Pg.6
Troubleshooting
1) Inspection of LED light Bars. Open the front hinge panel by removing the (9) #8
sheet metal screws.
2) Put your sunglasses on and hit RUN on the setup screen. With the front hinge
panel open view if ALL lights are working. If not proceed to step 3, contact factory
for replacement light.
It may be possible to expose screens with LED lights out, but a repair is needed to
ensure optimal performance.
Light Bar Replacement / Installation
Note:
It is important to wear dark shaded and UV rated eye protection while testing any
UV Lights.
Do Not allow objects to contact the UV lights.
Step 1
Step 2
#8 sheet
metal screw LED light bar
Panel catch
Pg.7
3) Unplug main power cord.
4) Front hinge panel can be optionally placed on the ground for easier access by
pushing panel catch inward.
5) Disconnect the defective light bar connector (each bar has its own connector),
then remove the top, #8 nut holding down the light bar.
6) Installing the new light bar. Seat the light bar in its corresponding slot and attach
the connector.
7) Test the new light bar. See above step 2.
8) Secure the bar with the #8 nut.
9) Close the front hinge panel and replace the #8 sheet metal screws.
Troubleshooting Cont’d
Step 4
(optional)
Step 6
Step 5
Light bar
#8 nut
Light bar
connector
Panel catch
Slot in
bottom tray
Pg.8
Emulsion information
for the screen printer
A technical information article
by Douglas Grigar
Screen printers have available six types
of photoreactive stencil materials.There
are three direct emulsion choices,
diazo, diazo/photopolymer (dual cure),
and SBQ-photopolymer. There are also
three photo reactive film choices,
indirect film, direct/indirect film, and
photoreactive capillary films.
Diazo emulsions are the least
expensive and the first of the three
emulsion types available on the market.
Diazo emulsions are mid range in
available exposure latitude and can
have good edge definition. Drawbacks
are that many require hardeners for
long runs or water resistance lower
solids content is often needed for
reasonable viscosity.
Diazo Photopolymer emulsions are
hybrids of the diazo and photopolymers
and are also called dual cure. Dual cure
emulsions are the newest available
emulsions. Due to the hybrid nature
they have the largest available feature
and quality range. Dual cure emulsions
will have the largest exposure latitude
and are available in various levels of
water and solvent resistant features.
Dual cure emulsions generally have the
best resolution, definition, and bridging
qualities. Dual cure emulsions are
midrange in price, and higher solids
content versions are available with
reasonable viscosity.
SBQ- Photopolymer emulsions are
very fast in their exposure speeds but
also have the smallest exposure
latitude. They are pre mixed and have
the longest shelf life. Pure
photopolymer emulsions are the most
expensive and are best matched with
high quality single point exposure
systems. Pure photopolymer emulsions
have good resolution, definition, and
bridging qualities. Pure photopolymer
emulsions have the highest solids
content available with reasonable and
often excellent viscosity.
The solids content in an emulsion does
example would be that pure
photopolymer emulsions are available
in very high solids content with low
viscosity. Emulsion viscosity can also
change with temperature. Lower
temperatures cause the emulsions to
thicken. Solids content less than 30%
with low viscosity are often difficult to
coat without a mess. In addition, lower
solids percentage will require multiple
coatings to achieve reasonable mesh
coverage.
Fig. 1
Emulsion Over Mesh or EOM is a
measurement of the emulsion thickness
on the face or substrate side of the
mesh. EOM is a percentage of the
mesh thickness. (Fig. 1) Too low of an
EOM ratio will prevent a good gasket
seal, prevent good detail resolution,
and increase chances of saw tooth
edges. Manufacturers recommend an
EOM ratio of 10 to 20 percent.
With an emulsion stencil, more is not
better. Too much emulsion on the face
of the screen can cause difficult ink
transfer and details can break down in
a run. Emulsion drip from the mesh
while drying is a definite indication that
the coated emulsion is too thick.
Your emulsion manufacturer can
recommend a coating procedure for
each mesh count using a rounded or
sharp coating edge.
Fig. 2
The step coating procedure (Fig. 2) is
used to coat a screen to find your best
coating technique for that mesh count.
The step coating procedure starts with
a stroke on the face of the mesh. Then
coat the squeegee side once over the
entire screen. Coat again the squeegee
side on only two thirds of the screen,
then coat again one third of the
squeegee side (all wet on wet).
Dry your screen as normal. When dry,
face coat with the sharp edge of the
squeegee two thirds of the screen from
a crossing direction (perpendicular)
then dry face up. When the screen is
dry apply the last coat of emulsion on
the face side covering only one third of
the same direction as the last face coat,
then dry. With the face coatings there
will be nine examples of coating
thicknesses. Pick an exposure time that
fits the median coating technique and
expose the screen with a test positive
that covers all of the coating changes.
Wash out and dry as normal. Now you
can view the emulsion with a loop or
microscope. Inspect the changes in
thickness, then print with this screen
and inspect the printed results. With the
printed results compared to the visual
inspection, the best coating technique
for that mesh count can be determined.
Standardized mesh thread thickness
and weave for each mesh count is
needed for consistent and reliable
results.
The step coating procedure can be
used while eliminating some of the
steps, or replace the face coatings with
all wet on wet coating strokes.
All manufacturers recommend drying
coated screens with the face down
(squeegee side up) in a horizontal
position. A slightly elevated temperature
(not over 110 deg. F.), in a filtered
drying room or cabinet, will dry screens
in record time, often less than half an
hour. A dehumidifier will drop emulsion
drying time further.
Fig 3
Once the screen is dry, direct emulsion
will dry and conform to the profile of the
mesh fabric causing small hills and dips
in the surface. The smoothness of the
dry emulsion can be measured and is
represented by the term Rz value. (Fig.
3) The lower the Rz measurement
number the smoother the surface.
Pg.9
Fig. 4
Surface smoothness can affect your
substrate to stencil gasket. The lower
Rz numbers will be produced only by
machine coating or film products.
Direct/indirect and capillary films will
produce the lowest Rz numbers
possible for screen stencils. High solids
content emulsions and face coating
(second or more coats of emulsion over
dry first coatings) can also lower your
Rz measurements. (Fig. 4) Exact EOM
and Rz numbers can only be measured
by special testing equipment.
Indirect film products are
presensitized emulsions on film.They
are produced to expose and develop
before they are attached to the screen
mesh. Indirect film has fallen out of
general use as products that are easier
to use and have superior reproduction
properties are now available.
Fig. 5
Capillary films are a photosensitive
emulsion layered onto a film backing.
(Fig. 5) The name is indicative of the
action that causes the adhesion,
capillary action. With wet screen fabric
the film will draw into the mesh when
placed in contact with the face of the
screen.
Capillary films suffer from past bad
reputation for delamination (Fig. 6) the
current products available are capable
of long runs and excellent detail.
Capillary films produce the lowest Rz
numbers possible and can save large
amounts of screen room production
time.
Fig. 6
Capillary films are best applied with the
(emulsion up) on a hard flat surface.
(Fig. 7)
Fig. 7
Place a screen (squeegee side up)
onto the film, lightly mist the mesh with
a spray gun until the screen starts to
draw up the capillary film into the fabric.
(Fig. 8)
Fig. 8
Direct/indirect film products
(combination stencils) are two-part film
and emulsion combinations. Films
assure low Rz numbers and high detail
print quality. Direct emulsions produce
high stencil durability. Direct/indirect film
systems combine the best features of
direct emulsion and film products,
creating a strong, high definition stencil
that will make longer runs possible with
direct emulsion.
Direct/indirect film products require a
coating of direct emulsion. Then the film
can be adhered to the face (substrate
side) of the screen. One method is to
coat the screen (one stroke on each
side of the screen) then place the
screen (squeegee side up) on the film
(emulsion side up) and stroke the
squeegee side of the screen with a low
pressure stroke with a soft squeegee.
(Fig. 9) The use of newsprint on your
work surface will help with clean up.
Fig. 9
Stay consistent and you will be able to
predict your results with greater
accuracy.Your goal should be
consistency, predictability, and
repeatability.
Graphics and text copyright 2002
Pg.10
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