2008-01-12 Manufacturing News

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Paintless and light Specialty plastics Luran S in cover frames

HSV switches to new plastics from BASF for ventilation cover frames and the new process lowers costs since the component wall is thinner and there is no need for coating.

The Technical Moulded Parts unit of the Dutch company HSV has recently turned to Luran* S (ASA, acrylonitrile-styrene-acrylate copolymer) to produce large cover frames for ventilation grids. This BASF specialty plastics is replacing the impact-resistant polystyrene HIPS (high-impact polystyrene), which had been used until now. The new material entails a process change in which coating is no longer necessary. At the same time, the wall thickness of the cover frame can be markedly reduced. In spite of the higher price of this specialty plastics, the overall costs have been cut by one-third.

“In this particular application, the specialty plastic Luran S is considerably more economical than standard plastics.” says Luc Gysels, Market Developer Specialty Plastics at BASF. Up to now, the impact-resistant polystyrene had been foamed by means of the so-called thermoplastic foam molding (TSG) so that the requisite wall thickness could be attained. The TSG process imparts the polystyrene with a surface that calls for a subsequent coating. Luran S, in contrast, is injection-molded compactly and consequently already has a homogeneous and slightly structured surface, without a need for coating.

Luran S in cover frames. Click Here for High resolution image. photo 1: BASF

The cover frame for ventilation grids that the Dutch company HSV now injection-molds directly with Luran S – a BASF specialty plastics on the basis of ASA – had been previously made of polystyrene employing the thermoplastic foam-casting process. Photo 1, background: the predecessor made of polystyrene; foreground, left hand side: a new cover frame made of uncoated Luran S; right hand side: a silver-gray, coated in-between variant.

Ronald Kersten, who works at HSV in research & development in the realm of plastics technology, explains, “We conducted mold-flow analyses within the scope of the service that BASF offers for its PlasticsPlus* brands and then we injection-molded a cover frame compactly.” The results showed that the number of feed points is reduced from four to two and that the surface quality turns out better. The wall thickness of the cover frame is cut by more than half, to 2 or 3 mm. So, Luran S saves not only time but also material. HSV manufactures the cover frames for GEA Happel KlimaStechnik.

Homogeneous surface with Luran S. Click Here for High resolution image. photo 2: BASF

Photo 2 - Luran S (on the left side) already has a homogeneous and slightly structured surface, without a need for coating.

The specialty plastics Luran S from the PlasticsPlus product line also stands out for its low warpage, high dimensional stability and scratch-resistance. Luran S is highly resistant to chemicals and heat, it is very UV-stable and thus aging-resistant. This is particularly noticeable with the lighter colors.

* Trademarks of BASF.

HSV has been leading the field in the design, development and production of moulded packaging, insulation materials and engineered components from expanded plastics like EPS, EPP, EPE, Neopor and Dytherm for over thirty years. The company also designs, develops and produces moulded products from thermoplastic materials like polyethylene, ABS, Noryl, polypropylene and polycarbonate using the low-pressure injection moulding process. Engineered plastics components can also be designed, developed and produced according to the RIM method. The two latter types of products are used in packaging and casing for various branches of industry and for medical and technical equipment.

With manufacturing sites in the Netherlands and Poland and a sales office in the Czech Republic, HSV is a leading international supplier of foamed plastics components for a wide array of companies working in various industries.

HSV - Innovative in moulded plastics
Frankeneng 19
Ede NL

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