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A hot runner system that enables gas-assisted injection molding of Class A surface

6 Jun 2018

A hollow handle for a chainsaw, manufactured by gas-assisted injection molding, is an example of the use of HRSflow's FLEXflow technology. This servo-electric programmable valve gate solution for hot runner systems allows precision control and monitoring of the melt flow during filling of the mold cavity.

A hot runner system that enables gas-assisted injection molding of Class A surface chainsaw handle

The lightweight yet stable handle is made of a highly impact-resistant, easy-flow PA6-GF30%. The mold is provided with two hot runner needle valve nozzles of the MA series from HRSflow with a conical seal. They are designed for medium shot weights and optimized for the polymer used in this particular application. While the melt is being injected through these two nozzles, the servo-electric drive of the valve pins – the big feature of the FLEXflow technology – makes it possible to control the stroke, velocity and force independently of one another for each individual pin during the opening and closing phases. This ensures an optimum mold-filling process. 

With the gas-assisted injection molding technology, nitrogen is subsequently injected under high pressure into the injected melt, which is consequently pushed against the cavity wall. Through combination with the FLEXflow hot runner technology, the formation of flow marks and other surface defects that can otherwise occur when processing glass fiber-reinforced thermoplastics can be reliably avoided. The result is an injection-molded part that is hollow and thus lightweight, and has good shrink resistance and low warpage. It also boasts high flexural strength and a streak-free Class A surface. 

» Publication Date: 06/06/2018

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