Pneumatic or electric – the ELMET cold runner systems are smart

When producing elastomer parts of silicone or rubber, the raw material is injected into the hot cavity in the LIM process (liquid injection molding) and the temperature-dependent linking process is thus activated. Using a cold runner guides the unlinked material to the injection point cooled and prevents the formation of sprue or vulcanised distributor strands.

When using valve gate nozzles, the needle tip as such forms part of the shaping cavity that can be adjusted to any surface, leading to a hardly recognisable perfect gate point in the produced part.



The SMARTshot P is the compact classic in the fi eld of valve gate cold runner technology. It fits into practically any mold concept and all common injection molding machines. To keep the process window as large as possible, the material flow of each individual cold runner nozzle can be balanced by manual or – optionally – electrical adjustment. The electrical adjustment is conveniently operated via a separate touchscreen, allowing the setting parameters to be saved and read in again later on a projectspecific basis.



The SMARTshot E is a new development of the needle actuation drive unit. The fully electric needle actuation is performed by a brushless servo motor and guarantees an extremely fast and smooth needle movement. The servo motor combines very high control quality with minimum heat generation. The perfect synchronization of the needle movements also ensures optimum process stability. The small size of the drive unit makes nozzle spacings of only 44 millimeters possible and enables the construction of compact molds.

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ELMET cold decks are designed for optimal function under the
following preconditions

Compressed air for MIDI and MAXI needle closure 6 bar |  87 psi
Standard diameter of the diving nozzle tip 15 mm | 16 mm
Cooling water temperature 18-25°C | 64-77°F
Cooling water pressure 4 bar | 58 psi
Useable for viscosities 9.000 - 1.000.000 mPas
Vacuum system permanent supply recommended
Cavity temperature considered for nozzle distance 180°C | 356°F
Parts injection weight at gate diameter 1.2 mm ca. 5-200g