Fakuma 2015 Next-generation drop-in system enables stable heating with minimised heat loss
Germany – Ewikon says that drop-in hot runner systems with nozzles screwed into the manifold offer a number of advantages for mould makers.
They come completely assembled including wiring, piping and all connector boxes and are intended to be easy to integrate into the mould construction.
Fakuma 2015 will see the public launch of the next generation of Ewikon's L2X drop-in system. The screwed-in nozzles now feature a coil heater which is directly integrated into precision-machined cutouts in the melt-bearing pressure tube. This design enables very stable heating with minimised heat loss along the whole length of the nozzle. It is already used in all Ewikon standard nozzles and can be used in the processing of a wide range of materials, including engineering plastics and reinforced materials.
Ewikon acknowledges that drop-in systems suffer a theoretical disadvantage compared to standard concepts. The heater's connection cables exit the nozzle at a fixed position and rearrange into random directions after the nozzle is screwed in place, and are then complicated to adjust.
The company says that it has solved this problem with the adoption of new connecting technology for the nozzles and manifold. The screw mechanism now incorporates a connecting nut that allows the nozzle to freely rotate and to align the connection cables precisely with the cutouts in the mould. The end position is then fixed by tightening the connecting nut. The technology also allows quick and straightforward deinstallation and reinstallation of the nozzle for ease of maintenance.
The L2X system comes with two fully balanced manifold versions and nozzles in lengths up to 350 mm with flow channel diameters from 6 mm to 12 mm. Other dimensions are available on request. Depending on the application, the customer can choose between open gating with several options, with or without heat conductive tips, various screw-on gate bush versions and valve gating. The valve gate version features cooled pneumatic drive units, flanged to the backside of the manifold. The valve pin guide is placed in the front of the nozzle and guides the valve pin during the whole operation cycle.