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Keywords of this article:  injection molding 
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Scania air vents, left for the driver's side, right for the passenger's side.
Scania air vents, left for the driver's side, right for the passenger's side.
Photo: 123

The processor Novares, Löhne and the Germany-based plastics distributor K.D. Feddersen GmbH & Co. KG have jointly developed the optimized material combination for the entire module of air vents built into the new Scania Trucks, which required various materials due to the different functionalities of the individual elements.

The horizontal vanes are made of the heat-stabilized polyamide (PA) 6 compound AKROMID B3 GF 30 1, reinforced with 30% glass fiber manufactured by Akro-Plastic GmbH, a K.D. Feddersen subsidiary.

In the assembly injection molding, the depositories, also called combs/strips, are developed for the "vanes package". The vanes are overmolded positively with Hostaform C9021 GV1/10, a polyoxymethylene (POM) reinforced with 10% glass fiber manufactured by Celanese.

It is important to note that no permanent connection is created, but that the vanes remain movable. The different shrinkage between the PA and the POM is therefore desired and as such contributes to the success of the function. Good tribology along with sufficient stiffness are crucial here.

The materials were selected beforehand with the help of Christoph Gerling, Business Development Manager at K.D. Feddersen.

The links between the controls and the vanes or ventilation flaps are also made of POM from Celanese, namely Hostaform C 9021 XAP². Here too, the tribological behaviour was the primary focus when selecting materials and designing the components.

As this is an application in vehicle interiors, corresponding emissions requirements are taken into consideration when selecting the selected Hostaform grades.

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