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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.
ELMET valve gate cold runners are designed as tool-bound components and permit individual setting of every single nozzle. The long needle guide and the patented infinitely variable setting mechanism of the pneumatically powered opening stroke ensure a low-wear and highly precise function. The flat material supply to the nozzle shaft and shaping of the nozzle-needle-combination ensure the lowest shear of the elastomer that is possible in the material guidance.
The sophisticated cooling water distribution prevents temperature influences in the cavity plate and warrants best stability in parts production process.
This makes ELMET to your leading specialist and partner for high quality & in own production produced LSR valve gate cold decks for efficient LSR manufacturing worldwide!
|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|
The elements of ELMET cold decks are arranged in a way that offers the mold designer a simple mold structure on the one hand, which on the other hand can be reached easily by the operators once installed.
With the electronic adjustment option for the needle valve nozzles, the flow behavior of the cold deck can be balanced during operation. Existing settings are saved and help shortening the restart of the mold after maintenance.
With ELMET cold decks not only liquid silicone rubber can be processed. By modifying the distribution and temperature system, also high consistency rubber can be processed with direct injection.