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Keywords of this article:  injection molding 
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injection mold 
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HRSflow will present challenging applications of their FLEXflow hot runner technology to improve the injection molding process.
HRSflow will present challenging applications of their FLEXflow hot runner technology to improve the injection molding process.

At K 2019, HRSflow will present challenging applications of their FLEXflow hot runner technology to improve the injection molding process.

These include examples for balanced Family Tools with extremely different part volumes, an extended cylinder range, the new SA series of nozzles for small shot weights, as well as HRScool, HRSflow’s innovative solution for hot runner injection molding in which water cooling of the associated actuators can be completely eliminated.

HRSflow will show a family mold for the production of high quality upper and lower bumper parts in one shot. Both parts are molded using PP 14% talc and are characterized by large volume differences, i.e. 3333 cm³ and 2170 cm³ respectively.

The use of the FLEXflow technology enables flawless surfaces without any flow mark and an accurate control of deflection on each component. The mold is equipped with a twenty-one-nozzle, electrically-driven valve gate hot runner system including two angled nozzles.

A second family mold example will be the hot runner system for a one-shot production of three high-quality polypropylene parts for a car interior door module, with volumes of 560 cm³, 338 cm³ and 58 cm³ and wall thickness ranging from 2.3 mm to 3 mm.

The mold is equipped with an eight-nozzle, electrically-driven valve gate hot runner system designed for sequential injection molding, allowing for a cycle time of approximately 55 s. Both hot runners are equipped with the new FLEXflow one manifold servo driven valve gate cylinders with reduced cut out, higher accuracy and enhanced repeatability.

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