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CN-140 TECHNICAL MANUAL
03-2021
Translation of the original manual
(Identifying which component causes decompensation is relatively easy if we
consider that the chemical components used in Polyurethane foaming systems are of
a different color. By observing the color of the material coming out of the gun you
will know which component is missing).
To determine whether decompensation occurs as a result of an obstruction or as a
result of a problem in the pumping system, project with the gun, observe the
pressure indicated on the pressure on the pressure gauge in the other component: if
the pressure of the missing component is higher, decompensation is the result of an
obstruction. If the pressure is lower, decompensation is the result of a problem in the
pumping system.
5. Cavitation
Cavitation occurs when the pumping system requires a greater volume of material
than that supplied by the feeding system, leading to the formation of a vacuum in the
dosing pump. The causes that can cause cavitation are as follows:
a. The transfer pump fails to supply the required volume. The problem may be
that the pump does not meet the required characteristics, the lack of air
supply to the pump or that the pump is faulty. A 2:1 ratio pump is
recommended for isocyanate transfer and a supply hose with a minimum
internal diameter of 20mm.
b. High viscosity. Polyurethane foaming systems normally require a minimum
transfer temperature of 12ºC. With lower temperatures, the product
increases its viscosity making pumping difficult. When environmental
conditions do not allow the products to be kept at a minimum temperature of
12ºC, auxiliary heating elements must be used to adapt the products to the
minimum temperature required for transfer.
c. The product inlet filter is obstructed.
d. There has been wear and tear on the gaskets or pump seals preventing the
supply of the required product.
Содержание CN-140
Страница 1: ...TECHNICAL MANUAL 2021 CN 140 PNEUMATIC EQUIPMENT FOR POLYURETHANE PROJECTION ...
Страница 36: ...36 CN 140 TECHNICAL MANUAL 03 2021 Translation of the original manual 24 ELECTRICAL DIAGRAMS ...
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Страница 44: ...44 CN 140 TECHNICAL MANUAL 03 2021 Translation of the original manual 27 CE DECLARATION ...
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