generally, it is more effective to heat or cool slender slots of large quantity than large-sized slots, which expands the range for mold temperature control. However, the slots should not be too slender in order that jam caused by scale can be avoided. The center distance between slots is approximate 3—5 times of the width of slots, sectional area of the slots generally equals to that of a circular hole whose diameter is between 6—12mm.
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