Special form of the spraying process with a special microspray release agent and greatly reduced spray quantity.
Here, suitable (sediment free) undiluted releasing emulsions or pure separating oils are spread finely nebulised in the smallest quantities on their own or in combination with adapted spraying tools over the surface of the mould surface.
Examples for water-miscible release agents suitable for conventional spraying as well as microspraying are Isolat® TT 77 und Isolat® Enviro 1011 (Tribo-Chemie).
Consequently, microspraying is understood as the fine nebulization of a small amount of oil or water-miscible release agent. The dissipation of heat occurs here through an optimised internal tool temperature control and not by the release agent itself.
This requires a new construction of the casting tools from scratch and for all production parameters to be adjusted, in particular the spraying appliances, spray nozzles and spray pattern.
The nozzles must not become clogged or blocked. An ultrafine emulsion without sediment particles (wax) or an oil resistant to high temperatures is also necessary. As an example, the release agent Isolat® UP 78 (Tribo-Chemie) is resistant to high temperatures.
Microspraying offers the following essential advantages: