チタン酸カリウム繊維/ポリスチレン複合材成形における繊維の流動配向II.射出成形におげる配向の層状構造
Flow Induced Fiber Orientation in the Moldings of Potassium Titanate Fiber/Polystyrene CompositesII. Multi-layered Structure of Injection Molding Plaques
竹田 啓・情野康男
Takeda, Hiraku / Seino, Yasuo
The effects of molding conditions on fiber orientation patterns were studied using X-ray diffraction. From an analysis of the diffraction patterns in the depth direction, it was determined that the plaque consists of three or four layers with different orientation patterns and thicknesses. Preferential directions of fibers the outer two layers, namely, skin and intermediate, are independent of molding conditions. The skin layer is preferentially oriented transverse to the flow direction, while intermediate layer is highly parallel. The patterns in the core layer can be classified into two different types. Type I, with transverse orientation, appears in a plaque under fast mold filling conditions. When the plaque thickness is over 1mm, a sub-layer appears near the intermediate layer, the thickness of this sub-layer decreases with increasing flow length. Type II shows the parallel orientation as opposed to that of type I and appears at a slower flow rate.
Key words: Composites / Injection molding / Fiber / Orientation / X-ray diffraction / Polystyrene