The injection molding of precision and micro parts creates special demands on the moldmaker and hot runner supplier.

Since the weight of the parts ranges from 0.05g to 2g the weight of the runner system has an increasing influence on part price. Due to the fact that most tiny parts have to be produced with very small tolerances, it is necessary to use a naturally balanced runner system to achieve uniform filling of the cavities.

  With a solidifying runner system, the weight of the runner is many times the weight of the part. This creates high material costs per part and necessitates additional equipment to separate the runners from the parts, thereby increasing the total part price.

 On the other hand, the use of a conventional commercial hot runner system will increase the mold size and also the mold costs because of the size and number of nozzles required to inject the parts directly. To reduce mold and material costs, a fully balanced hot runner for a large number of cavities with fewer control zones and a small pitch is required.              

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