TECHNOLOGY | HOT RUNNERS
Rigth: Philippe Monnet, CEO at SiSE,
standing by its MV3 series multi-zone controller
seals on the face of the cavity and is compatible with industry standard cut-outs, Mold-Masters says. The gate seal features an easy-to-replace slip-fit insert liner and threaded gate seal tip. The design of the thermal gate reduces crystallinity in the gate and prevents stringing over a wide processing temperature range.
Mold-Masters combines the new Axiom TG nozzle with its iFlow manifold technology as a replacement system for single stage PET bottle production. Its iFlow manifolds are manufactured from two separate pieces of steel, with the hot runner channels carefully milled from each half of the manifold. This allows for the incorporation of melt-flow geometries, flow-path options and runner shapes that optimise processing performance, allowing for smooth transitions that minimise hang-up spots and dead spots, permitting rapid colour changes. Optimised runner diameters address pressure loss, material residence time and shear rate, and enhance temperature uniformity, the company says. Mold-Masters also developed a new gate seal
Below: Thermoplay hot runner nozzles on display at Fakuma 2023
compatible with its Sprint hot runner system that is designed to help improve environmental stress crack resistance (ESCR) during the production of carbonated soft drink (CSD) caps. Its new Sprint Apex Gate Seal is designed to significantly minimise the presence of injection flow lines, which can increase the ESCR level of CSD caps by up to 40%, as determined and validated through third-party testing at Dow Pack Studios, the company says. ESCR is a key performance indicator that
measures durability of a CSD cap when it is placed under pressure or encounters severe operating conditions. The presence of injection flow lines can negatively affect ESCR performance. Additionally, in-field beta testing of the Sprint Apex gate seal on
IMAGE: M KNIGHTS
high-cavitation moulding systems determined that stress cracking was eliminated on all dimple and non-dimple CSD-cap designs. The design of the Sprint Apex gate seal elimi-
nates the use of vespel caps, which are a wear item, for reduced maintenance costs. The gate seal also improves the appearance and quality of CSD caps that have difficulty hiding flow lines, such as transparent decorative caps. The Sprint Apex gate seal enables light weight-
ing of CSD caps for cost savings without sacrificing product durability. It also enables use of recycled and bio-based resins that do not have the same ESCR durability as conventional resins. Colour change performance is improved by up to 65% when compared to standard gate seals, according to Mold-Masters.
Combined effort SiSE introduced a new control concept at the Fakuma show that combines its MV3 series multi- zone controller for hot runner systems with its GC product line specially designed for sequential valve gate control and Industry 4.0 traceability. Philippe Monnet, CEO and Marketing Manager
at SiSE, says the new MGC Hybrid 3 unit can handle 12, 24, 32 or 48 hot runner zones and can control either 6 or 12 sequential valve gates. The control screens for the hot runner system and for the valve gate control are combined into a single colour touchscreen unit. The MV3 series uses a completely redesigned version of Permanent Self Tuning Control software that continuously recalculates control parameters for each zone, immediately considering evolutions in the process. The software, conceived and developed by SISE, also features new softstart modes as well as commands for raising and dropping temperature.
22 INJECTION WORLD | November/December 2023
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IMAGE: M KNIGHTS
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