|
 |
Spray Guns
|
|
Most every commercial Polyurethane Foam Spray Gun uses impingement-mixing technology to mix the chemicals inside the gun. Pouring and injection applications can incorporate a variety of different mixing technologies including static and dynamic mix, however, in this section we will focus on spraying.
It is important to understand that once the two materials come together inside the gun to mix, they begin to react immediately as they mix and exit the spray gun. If the all of the reacted material is not expelled from the gun once the trigger is released, the material will set-up and harden inside the gun, rendering it non-usable. The design function within the spray gun that assures this does not happen is called purging. There are three basic purge systems offered by the various manufactures that offer different degrees of advantages and disadvantages, mechanical purge, air purge and solvent purge.
|
|
|
|
|
|
|
Printable 
