New solution to dead spots in melt channels of hot-runner manifolds

Heitec Hot Runner Systems (Burgwald, Germany), a hot-runner manufacturer represented in North America by Technoject Machinery, offers a new solution to dead spots in the melt channels of hot-runner manifolds. The melt channels are milled into the plates, providing a smooth channel through which the plastic can easily flow.
The machined melt channels eliminate sharp turns or hang-up points (dead spots) in the manifold. The plates are then soldered together to form a single manifold. The traditional method of manufacturing hot runners is by drilling and plugging the ends of the runners with plugs. However, this method may increase the pressure in which the melt needs to flow through the hot runner, due to sharp corners.
By milling in smooth transitions it is possible to reduce the melt pressure through the hot runner and provide a better, more balanced fill. This opens up the process window which is very important when processing engineered resins that have a tendency to degrade quickly. Additionally, color changes can be done faster with milled melt channels because there are no dead spots to trap material, a key factor for molds in which parts need frequent color changes.

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