spots of adherence in polycarbonate bar moulds
Posted in: Tech Help, Tips, Tricks, Techniques
Dominique,
The temper is probably off looking at the pictures, but I suspect the root of the 'problem areas' is seen in one of the pictures you attached. These molds have a plastic ridge underneath to stiffen the mold. This is resulting in the cooling rate of the 'sticky' section under the plastic ridge to not be the same as the other areas of the mold. A fixed temp fridge is unfortunately a poor alternative to a cooling tunnel where the temperature is ramped down during the movement through the tunnel. You may find leaving the mold in longer helps or not!
It's something that we have dealt with by selecting molds that don't have these sorts of plastic bars under them. A real cooling set up (tunnel) may not be as problematic but an inexpensive solution is to avoid certain mold styles.
Do you use sheet pans with the molds placed on them or just place filled molds directly on the wire racks in the Fridge? That can also make a difference in cooling rate and cause uneven cooling spots.
You need to determine the correct time to have the molds in the cool also......
Good Luck
