Ewikon From easy adaptation to specific application
Hot runner solutions are essential for tool and mould making. The latest technology from this field will be shown at Moulding Expo 2017. Ewikon will present the latest developments in multi-tip and valve gate technology with focus on multi-cavity applications.
The Ewikon micro-manifold technology is a solution for very compact moulds with an extremely high number of cavities. It enables the cost-effective large-scale production of parts with small shot weights, the company says. A system consists of fully balanced micro-manifolds with four screwed-in heat-conductive tip inserts, each of which are fed by a main manifold placed on a second level.
A manifold/four-tip cluster requires only one coil heater and one control zone. Thus, the expenditure for control technology is considerably reduced. Furthermore, the reduced space requirement for electric wiring allows for very compact moulds with maximum stability. A hot-half concept with standardised dimensions for moulds with up to 192 cavities is available.
Another featured product is the Ewikon HPS III-MH multi-tip nozzle concept, which, according to Ewikon, is one of the most advanced solutions for direct side gating available today. Standard materials as well as technical resins and filled materials can be processed easily. The patent-pending installation technology for the tip inserts facilitates installation and exchange from the parting line of the mould and requires only standard mould inserts.
The nozzles come in several sizes for shot weights of up to 40g per gate and are available for linear or radial arrangement of parts. The field of side gating applications is growing steadily and now includes much more than the typical target market (medical), which uses the HPS III-MH nozzle, e.g., for high-precision moulding of syringes or pipettes.
Moreover, side gating is proving to be a more cost-effective solution than conventional gating in other areas as well, including the electronics industry and when producing technical parts.
Side gating more cost-effective than conventional gating
The Ewikon range of valve gate solutions offers a variety of system designs and drive options for easy adaptation to specific application requirements. The second generation of electric drive units with step-motor technology is available for more demanding applications.
Better yet, there is zero emission of particles compared to pneumatic or hydraulic drive units. Thus, this technology is particularly suitable for cleanroom applications. Furthermore, the system enables the individual adaptation of operating parameters to the process requirements in several valve pin operating modes.
Examples are a function for complex movement profiles of the valvepins, which makes it possible to approach several positions with one injection cycle, and the fast fine-adjustment of parameters like valve pin velocity during production. The system is operated with an internally designed high-performance control unit with comfortable touch screen control. A linear servo-motor is available as an alternative for applications with close distances between cavities that require synchronous plate vale pin operation.