Applications | product update ELECTRICAL


RadiCal fan exploits LFTs


EBM Pabst is using a Celstran long fibre reinforced thermo- plastic (LFT) from Celanese Corporation to manufacture the fan impellers used in its RadiCal series of fans for commercial office and factory applications.


The PP-based Celstran LFT is said to be well suited to this demanding applica- tion, which features a complex geometry and is exposed to high mechanical loadings. The new RadiCal fan series uses backward curved blades and is designed to provide a high level of hydraulic efficiency. EBM- Pabst used simulation models to optimise the impeller shape. Models and prototypes were used to avoid large cross-sectional jumps and flow losses. This, combined with the claimed good damping characteristics of the Celstran LFT, helps keep noise levels to the minimum. ❙ www.celanese.com


TRANSPORTATION ABB opts for Ultradur PBT for contactors


French electrical group ABB has adopted an Ultradur PBT compound from BASF to manufacture the housings used on DC contactors it supplies to customers in the railway industry. The company selected


Ultradur B4450 G5 for this www.injectionworld.com


application for its ability to meet the stringent fire requirements of the NF F 16-101 French railway standard. The 25% glass-rein- forced grade uses a special flame retardant system that generates low smoke density and toxicity.


The resin offers good


processing and mechanicals. It also displays minimal corrosion of installed metal components even when exposed to high humidity environment and a CTI value of 600.


BASF says the Ultradur


B4450 G5 grade is suitable for use in a variety of current-carrying electrical components where dimen- sional stability is critical, including micro circuit breakers, power electronics housings and coil bodies. ❙ www.basf.com


March 2014 | INJECTION WORLD 57 PERSONAL CARE


Seven component mould sets toothbrush record


German mouldmaker Zaho- ransky has designed and supplied a seven-component 16-cavity mould for production of toothbrushes to Schiffer, a leading toothbrush maker based near Cologne. The system is claimed to be


the first seven-component toothbrush production system to be built worldwide. It uses two injection stations and one loading and removal station, which is located outside of the mould. Two different resins of the same colour are processed at the first station while two different TPEs are moulded at


AUTOMOTIVE BMW i3 roof uses Kraiburg TPE


German carmaker BMW selected TPE from Kraiburg to manufacture the roof trims for its recently introduced electric i3 model. The company selected a Thermolast A TPE for the application. The TPE trims


are part of the shell of the car and must be weatherproof and dimensionally stable to maintain the required sealing function between the roof and door frame. Thermolast A offers good


UV and weathering resistance,


high flow, good moulding and the ability to bond to PC/ABS. The latter was a key require- ment for BMW as the body parts are produced using a two-component moulding process. ❙ www.kraiburg-tpe.com


the second station. One of these TPE compo-


nents can be injected in four different colours to allow Schiffer to manufacture all its customer’s colour combina- tions without time-consuming colour changes. In the past, a colour change meant a stoppage of around two hours, says Zahoransky. Aside from the time saving, Schiffer also wastes less material and can offer a shorter leadtime. Zahoransky says accommo- dating the seven injection units in the available space was a challenge, especially as the


nozzle spacing is quite small and the resins process at different temperatures. The resulting moulding


system is based around an Engel moulding machine equipped with six injection units. A seventh injection unit manufactured by Dr Boy is also integrated into the system. Mold-Masters supplied the hot runner system, which uses a two-part soldered construc- tion to achieve the complex flow geometry in a low overall height. ❙ www.zahoransky-group.com


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