Blow molded bottle cooling

Customer designs and manufactures plastic bottle handling equipment. They are building a bottle trimming system. The bottles are made in a blow molding machine and transferred to their trimming system to have the flash removed and the neck area finished. The neck finishing part of the machine incorporates two different material removal operations, a rotary knife cut off to get the finished height of the neck and a reaming operation to get the finished size on the inside diameter of the neck.

The bottles are still warm from the molding process so as they cool they continue to shrink causing the machined surfaces to be undersized for the next operation. They incorporated EXAIR Model 3240 Vortex Tubes to blow cool air inside the neck finish. The cooling helped to maintain tolerances and eliminated jam ups in subsequent operations.