Magnum Venus Plastech TESTING & ADJUSTING YOUR MVP PUMPING SYSTEM - Manual (Page 26)

Testing & Adjusting Manual
Rev. 01/2013 Page | 26
T B T B T B
TEST RESULTS -
What Do They Mean?
If all areas of the test spray harden at the same time, there is no problem and you may
go on to part production.
If there are areas with little or no hardening (or extremely fast hardening) check the
following descriptions for the one that best matches your results and follow the
suggested procedure to fix the problem: A rule of thumb is when you have slow or no
cure it is a catalyst pump problem and if you have a hot spot or fast cure the problem is
the resin pump. Fast cure can be the product of higher temperatures if it is over the
whole part and consistent.
The tests performed below can also be adapted to pour applications by pouring a saw
tooth shaped bead of material. Where the top of the saw tooth is the top of the stroke
and the valley is the bottom of the stroke.
Note: With the UPS (Ultra Proportioning System) when the resin pump is in the up
position the catalyst pump is in the down position, which means when the resin
pump is going up the catalyst pump is going down.
Improper cure at the top and bottom of the stroke indicates an accumulation
issue either catalyst or resin.
Result 1:
Material delivered at the top and bottom of the stroke is not curing or curing more slowly
than the material delivered in the middle of the up- and down-stroke, see figure above.
Indicates: Low/no catalyst at top (T) and bottom (B) of the pump stroke.
Probable Cause: There is no or improper accumulation effect in the catalyst
system. Normally this is only a problem at high pressures.
Solution: Check to be sure you are using the proper catalyst hose, with or
without core. Install a catalyst accumulator if needed. Check for a restriction in
the catalyst system. (For chargeable accumulator systems see section below)