スタンパブルシートのリブを有する圧縮成形品における材料流動挙動
Flow Characteristics of Compression Molded Stampable Sheet with Rib Part
_田泰以・前川善一郎・佐藤豊弘・山口 進・越本 勝
Hamada, Hiroyuki / Maekawa, Zen-ichiro / Sato, Toyohiro / Yamaguchi, Susumu / Kosimoto, Masaru
Moldings using stampable sheet of long fiber reinforced thermoplastics are produced by material flow under compression molding. Generally, ribs are incorporated into the moldings to increase the stiffness of the components. Unfortunately, the fibers are often unable to fill the ribs due to the long fiber lengths and the stampable sheet parts cannot be effectively stiffened.
In this study, the influence of die design on material flow during compression molding were examined. The material flow of each layer was observed by photographing vertical sections and taking soft X-ray photographs. An image processing system was then used to measure the fiber flow length into the rib section.
These studies revealed resin exudation during the compression molding process. The fiber flow length into rib section was enhanced by using a die with a large fillet radius.
Key words: Long fiber reinforced thermoplastics / Stampable sheet / Compression molding / Material flow