New Side-Gating Tunnel Gate Inserts

The new SGC series of contourable tunnel gate inserts from the German firm of i-mold GmbH & Co.KG were developed for a extended range of applications and are being distributed by DMS (Oldcastle, ON). These new tunnel gate inserts differ from the previous design of insert in that the runner opens from the front side, but the actual gating surface can be located exactly where desired, depending on the design and function of the molded part.

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The new SGC series of contourable tunnel gate inserts from the German firm of i-mold GmbH & Co.KG were developed for a extended range of applications and are being distributed by DMS (Oldcastle, ON). These new tunnel gate inserts differ from the previous design of insert in that the runner opens from the front side, but the actual gating surface can be located exactly where desired, depending on the design and function of the molded part. The SGC series of tunnel gate inserts is ideal for applications where the injection point has to be positioned deep inside the molded part. They are available in three sizes for maximum shot weights of 40, 140 and 1100 g respectively, and are suitable for all standard and engineering plastics, and also for filled or reinforced materials. An integrated dead-end recess reduces pressure loss and shear stress. The sprue in the runner can be readily and reliably removed, provided that a certain distance, which is dependent both on the type of material and on the size of insert, is maintained between the gate and the ejector. 3-D or 2-D-CAD data are available for all gate inserts, permitting easy integration into the mold design process. They are machined from highly wear-resistant steel and have a hardness of 54 HRC. Multi-cavity molds can be manufactured at particularly low cost if the tunnel gate inserts are combined with the LKM Heatlock hot runner systems also included in i-mold's sales portfolio. This combination, in which one hot runner nozzle feeds several—mostly four to six—tunnel gate inserts, offers a great many advantages: even in molds with a large number of cavities, only a relatively small, and hence, low-cost hot runner system is required. Moreover, the relatively simple constructional features of the mold not only make for a reduction in size but also ensure extreme reliability of operation.