VASTEX E20-2024 Parts list manual

Doc. # 01-04-044
Vastex E-mail assistance
Purchasing & Product Info:
[email protected]m
Electrical Support:
[e-mail]
Tech Support, Mechanical Setup, and Operation:
[e-mail]
Screen Printing Issues & Support:
[email protected]
Vastex International, Inc.
7 Emery St
Bethlehem, Pa. 18015 USA
Phone# [phone] Fax# [phone]
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
Year of Manufacture: 20____ Original Instructions
Serial Number: VTX
(Please log your machine's serial number and date of purchase for future reference.)
Date: / /
Electrical Drawing #: Revision:
E20-2024 LED Exposing Unit
Assembly and Operation Instructions
Contents Pg. #
Introduction, Machine Specifications 2
Safety Information 3
Operating Instructions 4
Maintenance 5
Emulsion Tip 6-7
01-00-005/015 Warranty/Terms and Conditions 8

Doc. # 01-04-044
Vastex Exposing Units
(LED 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.
E20-2024
Overall Size
Depth x Width x Height
26.1” x 21.5” x 8.4”
(66.3 x 54.5 x 21.3 cm)
Weight 45 lbs. (20.4 kg)
Screen Capacity 20" x 24"
Power Requirements 120v: 60Hz @ 1.0 Amps
240v: 50/60Hz @ 0.5 Amps
Exposure Timer Analog P/N 04-01-085
Glass Reorder Numbers P/N: 04-08-092
LED Light Bar LED Light Bars
P/N: VLB-15
LED Power Supply P/N: 04-08-079
Floor Model/Tabletop Table Top, optional stand available
Warranty 3 Years; Manufacturer Defects
Machine Specifications & Part Numbers
Introduction
Note:
For the E20-2024, glass sold separately, Vastex part number 04-08-092. It can also be
purchased locally, ask for 1/4” x 21” x 25” clear float glass with polished edges, tempered
is best but not required.
!
Pg. 2

Doc. # 01-04-044
** WARNING HANDLE GLASS WITH CARE **
Wear gloves when handling the glass
Lay glass only on a flat protected surface
Tempered glass, although strong, can shatter if the edges are subject to an impact
Safety
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 removing glass or 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
Tools Required
 Flat Blade Screw Driver
 1/4” Wrench
 OR METRIC: 7mm Wrench
 Exposing Unit must be on a flat surface to
eliminate stress on the glass.
 Plug into a properly grounded outlet in good
condition.
 UV LED Lights are used in this machine. The
lights should Not Be viewed during operation
without eye protection.
Pg. 3

Doc. # 01-04-044
Sequence of Operation
1) Wipe the glass surface clean with a lint free
rag.
2) Position the screen with positive attached, onto
the glass.
3) Lay the pressure plate on top of the screen.
 Optionally, add more weight to top of
pressure plate, approximately 10lbs (4.5kg)
4) Turn the power switch to the middle position.
5) Set Exposure Time. (See Tips).
6) Start Exposure Cycle by pressing up on the
power switch.
7) End of shift, turn the power switch to the off
position.
Tips
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.
Approximate setting for “Dual Cure”: 1 – 5 minutes.
Overview:
Your Exposing Unit is equipped with LED Lights, exposure timer, and a switch for main power and
exposure cycle start.
Operation
Control Panel
Timers are factory set to a 0-5 minute scale for
exposure. The mode in the lower right corner is
set to B. For exposure tips, please see below.
RANGE SELECT
adjustment screw
Mode selection screw
Time
adjustment dial
Time indicator
Run Light
Pg. 4

Doc. # 01-04-044
Glass Removal / Installation
There are three glass retainers. One on each side to hold
the glass in place.
1) Loosen the #8 sheet metal screws securing the glass
retainers to raise them. Slide the glass off the
machine.
NOTE: If needed the glass retainers can be removed
completely.
2) It is important to keep the inside of the cabinet clean.
It is a good idea to vacuum out any loose debris from
inside the cabinet. Refer to the replacing a light bar if
needed.
3) Reinstalling the glass.
Before installing the glass clean both sides of the
glass with glass cleaner and a lint free rag. Vacuum
inside of cabinet. Position the glass between the side
retainers. Slide glass back until it contacts and it is
seated squarely against the back retainer. Push
down on the glass retainers and tighten the sheet
metal screws. Be careful to not over tighten and strip
the screws.
4) Inspection of LED light bars should be done monthly.
See bellow for instructions.
Wear gloves when handling the
glass. Glass is tempered and
although strong, can shatter if the
edges are subjected to an impact.
Do Not allow objects to
contact the LED light lens.
Maintenance
Note: It is important to wear dark shaded and UV
rated eye protection when testing LED Lights.
Do Not allow objects to contact the LED light
lens.
It may be possible to expose screens with
LED lights out, but a repair is needed to
ensure optimal performance.
Light Bar Replacement / Installation
1) Inspection of LED light Bars. Put your sunglasses
on and press the switch to EXPOSE. Check to see if
any lights are not operational.
2) Remove exposing unit glass, see Maintenance
section for glass removal.
3) Unplug main power cord, unplug light bar connector,
and remove both #8 sheet metal screws holding the
light bar in place. Each light bar has a power
connector.
4) Installing the new light bar. Install the #8 sheet metal
screws, plug in the light bar connector, plug in the
main power cord.
5) Test the new light bar. See step 1.
6) Replace exposing unit glass.
Light Bar Connector
Pg. 5

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. 6

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
Douglas Grigar [email protected]
Pg. 7

Vastex Warranty
Doc#01-00-005D Revised 2/20/2018
(1.) Vastex, hereinafter referred to as “seller” warrants only to its original “purchaser”, who holds a copy of the original invoice and is the original end user of the equipment in question, its
new equipment against manufacturer defects in materials or workmanship on a pro-rated basis. Warranty period begins from date of shipment to the buyer and will only apply to customers
paid in full. Warranty periods are as follows: one (1) year for E-1000, three (3) years for all other complete machines (including F-Flash), fifteen (15) years for infrared heaters (excluding F-
Flash) installed by Vastex in a new dryer, three (3) years for replacement infrared heaters, and one (1) year for replacement parts. Rubber blankets, light bulbs and glass on exposure units
are particularly subject to wear while in use. Wear is not covered by this warranty but as stated above only manufacturers defects are covered. All sales made through Vastex dealers must
be certified by that dealer before a warranty replacement is issued. All equipment is thoroughly tested and inspected before packaging. This warranty does not cover minor cosmetic
damages that occur during shipment that do not affect the functionality of the equipment.
(2.) This warranty is expressly contingent upon the buyer delivering to seller, at the address below, with all transportation charges prepaid, the part or parts claimed to be
defective within the above mentioned warranty periods stated in paragraph one. The defective part or parts will be repaired or replaced at the discretion of Vastex International,
Inc. If the equipment in question is less than one (1) year old, it will be shipped to the customer at no charge, with an RGA issued by Vastex for the defective part. The defective
part must be shipped back to Vastex freight prepaid within 30 days or the account will be billed. If the equipment is more than a year old, the part will be shipped after we
receive the defective part. If it’s necessary to expedite the movement of parts and to minimize down time to the buyer, the replacement part shall be supplied on a C.O.D. basis. If
testing and analysis of said part by the seller or its supplier discloses that said part is defective, the cost of said part will be refunded to the buyer on a prorated basis.
(3.) Except as otherwise provided herein, the equipment is being sold “as-is”. Final determination of the suitability of the equipment for the use contemplated by the buyer, is the sole
responsibility of buyer, and seller shall have no responsibility in connection with the suitability.
(4.) All warranties implied by law, including the implied warranties of merchantability and fitness are hereby limited to manufacturer defects in materials or workmanship during the
warranty period stated in paragraph one. The express warranty and remedies contained herein and such implied limited warranties are made solely to the sole warranties and remedies and
are in lieu of all other warranties, guarantees, agreements, and other liabilities, whether express or implied, and all other remedies for breach of warranty or any other liability of seller, in no
event shall seller be liable for consequential damages.
No person, agent, distributor, or service representative is authorized to change, modify or extend the terms hereof in any manner whatsoever.
These terms and conditions are an essential part of the transaction between the parties and constitute the entire agreement between them with respect to the same.
Some states do not allow limitation on how long an implied warranty lasts of the exclusion or limitation of incidental, or consequential damages, so the above limitation may not
apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Infrared heaters are the only replacement parts covered for a period of (3) years from date of shipment and contingent to receipt of payment in full.
Electrical components cannot be returned once installed unless proven defective.
Please refer to doc. 01-00-015 for specific terms and conditions of sale and the limited warranty.
Please refer to doc. 01-00-017 for V-2000HD printer warranty.
Updates: V1000 to 3 year warranty 01/09/12, Heater warranty to 15 years 01/02/2012.
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TERMS AND CONDITIONS OF SALE AND LIMITED WARRANTY Doc.#01-00-015
1. Buyer’s order will constitute an offer in accordance with the terms hereof and such offer, upon acknowledgment of Seller, will constitute the agreement between Buyer and Seller.
Buyer’s order after such acknowledgment by Seller will not be subject to cancellation, change or reduction in amount, or suspension by Buyer of deliveries, unless prior to such
action Buyer has obtained Seller’s written consent. Notwithstanding anything to the contrary in Buyer’s Purchase Order or other communications, the parties agree to be bound by
these Terms and Conditions. Acceptance of the product by the Buyer shall be deemed to constitute unconditional acceptance of these Terms and Conditions.
2. Any of these terms, conditions and provisions of Buyer’s order which are inconsistent with Seller’s acknowledgment and these Terms and Conditions of Sale shall not be binding on
the Seller and shall be considered not applicable to any sale so made. No waiver, alteration or modification of any of the provisions on either side of the document shall be binding
upon Seller unless agreed to in writing by Seller.
3. (a) All prices are F.O.B. Seller’s Plant and method of delivery and routing shall be at Seller’s discretion, unless specifically otherwise stated herein. Notwithstanding any agreement
to pay freight, delivery of products purchased hereunder to a common carrier or licensed trucker shall constitute delivery to Buyer and be determinative of the date and time of
shipment and all risk of loss or damage in transit shall be borne by Buyer. If the Buyer fails to accept the goods from the common carrier or licensed trucker, the Seller shall be
entitled to claim payment from the Buyer. Seller shall arrange for storage, the risk and the cost, including insurance costs, to be borne by the Buyer (and Buyer agrees to pay
such amounts upon demand) except if the failure to accept delivery is due to any of the exceptions noted in Paragraph 4.
(b) Terms of payment shall be as stated on invoice.
4. It is understood that deliveries will be made in accordance with Seller’s regular production schedule. Every reasonable effort will be made to meet the Buyer’s required delivery
dates but Seller will not be liable for damages or be deemed to be in default by reason of any failure to deliver or delay in delivery due to any preference, priority, allocation or
allotment order issued by the Government, whether Federal, State or local, or causes beyond its control including but not limited to, Acts of God or a public enemy, acts of
Government, fires, floods, epidemics, quarantine restrictions, strikes, lockouts, freight embargoes, severe weather, unavailability of materials or shipping space, delays of carriers or
suppliers or delays of any subcontractors. Should delay in delivery be caused by any of the circumstances mentioned in this paragraph, such extension of the delivery period shall be
granted as is reasonable under the circumstanced of the case. Should delay be caused by an event not specifically mentioned in this paragraph, damages will be limited to
cancellation of the purchase order without penalty, and refund of any monies deposited or prepaid on the purchase order with no liability for any consequential or incidental damages.
5. Seller reserves the right to increase the prices prior to Seller’s acceptance of order and/or after expiration of any price quoted by Seller.
6. Unless otherwise stated in writing, Seller’s prices do not include sales, excise, value-added or other taxes. Consequently, in addition to the price specified herein, the amount of any
present or future sales, use, excise, value-added or other tax applicable to the manufacture, sale, purchase or use of the products hereunder shall be paid by Buyer, or in lieu thereof,
Buyer shall provide Seller with a valid tax exemption certificate acceptable to the taxing authorities.
7. Seller reserves the right, at any time, to revoke any credit extended to Buyer because of Buyer’s failure to pay for any products when due or for any other reason deemed good and
sufficient by Seller and in such event, all subsequent shipments shall be paid for prior to at delivery at Seller’s option.
8. (a) SELLER’S LIABILITY SHALL BE LIMITED TO SELLER’S STATED SELLING PRICE PER UNIT OF ANY DEFECTIVE GOODS AND SHALL IN NO EVENT
INCLUDE BUYER’S MANUFACTURING COSTS, LOST PROFITS, GOODWILL, OR ANY OTHER SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES, ARISING OUT OF THE AGREEMENT, THIS CONTRACT, THE SALE OF THE PRODUCTS TO THE BUYER OR THE USE OR THE PERFORMANCE
OF THE PRODUCTS. Seller may at its discretion repair, replace or give the Buyer credit (pro-rated) for such defective products.
(b) Notwithstanding anything herein to the contrary, Seller shall have no liability for alleged defects with the products which are not specified in written notice from the Buyer to the
Seller within thirty-six (36) months from the date of shipment of machines. Seller shall pass to Buyer any warranty received by Seller from the manufacturer of Limited Life
Components, which in most cases is 12 to 18 months.
(c) Seller shall have no liability under this Limited Warranty unless Buyer has paid in full for the products. Further, this Limited Warranty is expressly contingent on Buyer’s
delivery to Seller, all costs prepaid, the defective part(s) within thirty-six (36) months of shipment to Buyer, together with a written statement specifying the alleged defect(s).
Any replacement part(s) shall be shipped to Buyer on a C.O.D. basis.
(d) SELLER SPECIFICALLY EXCLUDES ALL WARRANTIES, EXPRESSED, IMPLIED OR OTHERWISE, EXCEPT AS STATED EXPLICITLY IN THESE TERMS AND
CONDITIONS OF SALE. SELLER DISCLAIMS THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
9. The remedies herein reserved by Seller shall be cumulative and in addition to any other legal remedies. No waiver of a breach of any portion of this contract shall constitute a waiver
of continuing or future breach of such provision or of any other provisions hereof.
10. These Terms and Conditions constitute the entire agreement of the parties. No amendments, changes, revisions or discharges hereof in whole or in part shall have any force or effect
unless set forth in writing and signed by the parties hereto. This contract shall not be assignable by Buyer voluntarily by operation of law or otherwise without Seller’s written
consent.
11. This contract shall be governed and shall be construed according to the domestic laws of the Commonwealth of Pennsylvania.
12. Anything herein to the contrary notwithstanding, any action for alleged breach by Seller of the contract between the parties, including but not limited to any action for breach of the
warranties herein set forth, shall be barred unless commenced by Buyer within one (1) year from the date such cause of action accrued.
13. This agreement shall inure to the benefit of and be binding upon the parties hereto, their respective successors and permitted assigns.
14. All notices required by this contract to be given by either party shall be sent in writing or by facsimile and shall be addressed to the last known address of such other
party. Notices shall be deemed to have been received on the fifth business day following deposit in the mail.
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VASTEX 7 EMERY ST
INTERNATIONAL BETHLEHEM, PA. 18015 USA
Pg. 8