As previously mentioned, reduced heat transfer into the mold can be achieved by minimizing the contact surfaces between the mold and hot runner.

The melt chamber is sealed at the front surface of the surrounding titanium rings. This compensates for the heat expansion of the manifold and avoids tension caused by heat expansion. The loaded face has minimal compression and therefore reduces the lifting power. The small volume of material in the gate chamber area facilitates quick color change and short dwell time.

The manifold must be located at its center to achieve a uniform heat expansion in all directions. The small pitch of the tips allows very precise calculation of the heat expansion and makes small gate diameters of 0.4mm possible.

The tips should be made of a material that shows a good compromise between wear resistance and heat conductivity. Special molybdenum alloys can be used to achieve this. If all the guidelines of mold design are taken into account, high quality parts with minimal gate markings can be produced with a mini hot runner system on small machines

There many applications for using mini hot runners in molds. They can be used with very small machines like the baby plast or under a distribution manifold that feeds four sub manifolds.

The possibility of combining the mini hot runners with standard manifold components offers a wide variety of mold concepts. Despite the minimized control zones and the simple implementation, the use of hot halves guarantees a correctly mounted system and avoids problems at the start-up of the mold.