KP Sheet is a stampable sheet made of glass fiber (GF) and polypropylene (PP), and has a distinctive characteristic of expansion in thickness. To realize light weight and high stiffness in automotive headliners, the GF content and arrangement in the thickness direction were studied with the aim of increasing expansivity. Although expansivity increases with GF content and the elastic slope is enhanced by the resulting increase in sheet thickness, the maximum elastic slope reaches saturation at a GF content of 50 mass% or more. Therefore, the GF arrangement in the thickness direction is controlled to improve GF spring back, resulting in a 30% improvement in expansivity at the same unit weight. A newly-developed ultra-light product (UL grade) realizes a high elastic slope of 7.2 N/mm at a web unit weight of 800 g/m2, while also displaying excellent moldability and dimensional stability equal to those of normal grade KP Sheet, enabling further weight reduction. (Engl. translation from JFE GIHO, 2004, No.4, p.77-82, (jap.))
Composite material for automative headliners - Expandable stampable sheet with light weight and high stiffnesss
Verbundwerkstoffe für Fahrzeug-Headliner - streckbares, stanzbares und leichtes Blech mit hoher Steifigkeit
JFE Technical Report ; 4 ; 89-95
2004
7 Seiten, 10 Bilder, 5 Quellen
Article (Journal)
English
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