Magnum Venus Plastech UNIVERSAL PROPORTIONER - Manual (Page 17)

UPLS SYSTEM OVERVIEW
UP-XX-XX-XX
MAGNUM VENUS PLASTECH REV 1.00
APRIL 2010 PAGE 17
9. Mix and metering check:
Remove the ratio block from the dispense gun and install the mix head with
check valve balls and springs. Install mixer onto the dispense gun.
10. With mixer over a waste bucket, turn gun on and allow for the fluid pressures to
balance. This may take one or two strokes now with the added restriction of the
mixer have been added in comparison to the ratio checks. Run a cup under the
stream and collect 50 to 100 grams of material. Make a log of the time the
sample was taken and material temperature. See materials data sheets for
recommended gel times. Please note the temperature the data sheets call out
for gel time.
11. Another, more complete mixing and metering test may also be run depending on
materials and application. The test requires laying a plastic film on the floor; the
film should be at least 4’ wide and 8 to 10’ long with no less then 4 pump cycles.
If materials are fairly thin, some cloth fabric laid over the plastic may help from
the resin pooling in low areas. The test (strip test) requires laying down a bead
of material on the film in a zigzag fashion. As the unit fluid section reverse
directions, use a marker along the resin stream to mark the pumps up-stroke and
down-stroke reversals. Look for a consistent gel time down the length of the strip
test. Keep in mind materials that puddle into thicker areas will gel faster then the
thinner areas. Pay special attention to the resin stream velocity exiting the mixer
tube at both pump reversals. The fluid stream velocity drop at both pump
reversals should be minimal. If not, then A & B accumulators will require
charging with air and or Nitrogen (see instruction information on page##). The
need for charging accumulators will vary depending on hose lengths, material
viscosity and operating fluid pressures. In many cases, no accumulator charge is
needed. Flush and air purge gun and mixer after running strip test.
12. Final settings:
The system is now ready to go into production. At this point, small adjustments
in pump air pressure and or flow rates may be made to suit the production
requirements. Once set, please take notes of the date, fluid pressures,
temperatures and approximate flow rates or pump cycles/min. for future
reference and maintenance schedule.