Magnum Venus Plastech DP-1000 (EPO3) - Manual (Page 20)

If the pressure is not adequate to form a well-defined fan pattern, increase the MAIN PRESSURE until there is
just enough pressure to form a proper fan pattern.
Described in the following are possible problems and their solutions with fan pattern:
One Narrow Stream: The MAIN PRESSURE is too low for the material you are using (see Figure 16 on
previous page).
Solution : Increase the MAIN PRESSURE. Increase the material’s temperature. Use a smaller nozzle size.
Three Heavy Fingers Horns are beginning to develop but the MAIN PRESSURE is still too low (see Figure
17).
Solution: Increase MAIN PRESSURE. Increase material pressure. Use a smaller nozzle size.
Middle Stream Not Full Width Middle Stream is wider but not the full width it should be for the nozzle (see
Figure 18).
Note: See Appendix B for spray nozzle list.
(Figure 17. Narrow Middle Stream Pattern) (Figure 18. Wider Spray Pattern)
Solution: Increa
se MAIN PRESSURE. Increase material’s temperature.
Pattern Near Full Width
There are well-defined fingers; however, there is little or no white frothing (air
bubbles) in the center of the sprayed material (see Figure 19)
Solution: Slightly increase t he operating pressure. Slightly increase material’s temperature.
Result: PATTERN IS AT FULL WIDTH and the fingers are well-defined. White frothing appears in the
sprayed material. However, the white froth should disappear in less than 2 minutes (see Figure 20).
Note: This is considered the best general set of conditions for the fan pattern. Keep notes of the MAIN
PRESSURE and the material TEMPERATURE gauge readings when the pattern is correct.