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02-23-2015

Miniature Hydraulics Create Space for the Backmolding of Natural Fiber Parts

Space in the Mold

Miniature hydraulics create space when the mold space is restricted, for example for back molding door trim for cars (figure: Incoe)

In the back molding of natural fiber parts in automotive engineering, for example for door trim, it is no longer large surfaces, but more often small and intricate parts, that are molded onto the reverse side of a large component. Compared to conventional plastic parts, about twice as many valve nozzles must be located within the same surface area. That means that space is confined for installation of the hydraulic cylinders. In addition, the distances to the gates, and therefore the nozzles are long, since the ejectors are mounted at the stationary mold side.

For such applications, Incoe International Europe, Rödermark, Germany, has developed a valve gate cylinder, which offers high performance in a small space. The new HEM miniature hydraulics offers a more flexible choice of gate points and creates adequate space for supply lines – not only because of the small size, but also because the cooling lines can emerge in four different directions. Since the HEM can be combined with the long nozzles of the DF 12 series, it is ideal for molds intended for back molding large natural fiber parts.

It is easy and reliable to operate and maintain. The new patented thermal isolation of the manifold and cylinder, which avoids critical heating of the hydraulic fluid, prevents damage to the moving parts and gaskets, and post-cooling after the end of production is also eliminated. The mold maker can mount the cylinder either directly in contact with the platen or with an air gap, as necessary, and demount it without uncoupling the cooling lines. The valve can be adjusted from behind.

Translated from Kunststoffe 2/2015, p. 12

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