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Cool Analysis

Why we need optimize cooling ?

There are two major reasons why cooling should be optimized.  The first is part quality and the second is cycle time.  When considering quality, several possible issues arise.  The first is surface finish.  The mold temperature can affect the appearance of the part.  As mold temperature changes, so does the gloss level of the part.  A higher mold temperature tends to lead to a glossier finish on the part.  For certain applications, this can be a major issue.

Residual stress and thermal bending are other quality issues.  As the mold temperature goes up, the cooling rate slows and more stress is relieved from the part, lowering the warpage.  When the temperatures on either side of the plastic cross-section are different, this can lead to the part warping or bending due to the non-uniform shrinkage of the part.

Molders are very interested in cycle time.  They want to make parts as fast as they can to keep production costs down.  When injection molds are optimized for cooling, the cooling of the part is reduced to the minimum time possible.  This often means that the part can be ejected hotter and still not warp too much, plus the part will still meet its critical dimensions.