Mold cooling baffle

The mold may consist of regions where circuits are not feasible. Additional cooling channels such as baffles, bubblers, or thermal pins may be used to divert the coolant flow into these regions. Shoemaker (2006) has shown some examples. 

For the cast mold, the cooling channel baffles can be located over areas to be vented, as shown in Figure 25. 

The vent opening will pass through a boss in the baffle to the back or outside of the mold. In machined molds, care must be taken so that vents miss the drilled cooling channels. When core vents cannot be used because the slots mark on the blown part will show, small drilled holes can be used. The effect of the size of hole on the surface of the part is shown in Figure 26. 

So-called deflection elements (Figure 2.44) or fountain cooling systems are used if the aforementioned elements cannot be used due to insufficient space. The temperature control medium is introduced into the mold core using a transverse baffle or tube, and the heat of the injection is removed over a defined sequence. 

Venting in the mold cavity should be anticipated in the mold design and layout of the cooling channels so that provisions can be made for their locations. For cast mold the cooling channel baffles can be located over areas to be vented, as shown in Fig. 13.25. 

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