Closed-mould application of release agent

The technique allows a reduction in the usage of both water and the release agent. This results in a lower amoimt of waste water and reduced emissions of steam containing oily particles. The active compoimds of the release agent are comparable to the traditional ones. Emissions due to decomposition of the release agent (and upon opening the die to get the casting out) therefore are comparable in nature to those with the open-mould technique. 

The technique requires an increased effort to cool the dies. In simple cases, this may involve a lowering of the thermal oil temperature, but for more complex dies, it may involve the application of an additional cooling circuit. 

Some operational examples in aluminium foimdries have been reported. These result in a 50 -80 % reduction in the spra dng time, and a 80 % reduction in sleeve-parting agent consumption. 

The technique is applicable in existing installations, but may require the production of specific dies with integrated or adapted cooling circuit. The applicability is limited to specific types of castings, dies and casting machines and is mainly based on technical considerations. This technique is not a general alternative for the application of release agents. 

Foundry strategy to reduce waste water production and to reduce the consumption of water and chemicals. 

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