To realize the continuous feeding of main material and sub-material under the state being fully mixed together.
A synchronous feeder 10 equipped with a feeding hopper 15, which receives resin pellets, a feeding pipe 17, which feeds a masterbatch in the feeding hopper 15 and a mixing attachment 16, which mixes the resin pellets and the masterbatch and, at the same time, continuously feeds them to a molding machine 11, is installed to the stock feeding port 48 of the molding machine 11. In the mixing attachment 16, an intermediate divergent part 34, in which the opening crosssectional area becomes gradually larger downwards, is formed so as to efficiently mix the resin pellets and the masterbatch due to their flowing not only towards a feeding direction but also towards the widening direction of the opening crosssectional area in this intermediate divergent part 34.
YOSHIDA HITOYOSHI
FUKUDA YOSHISANE
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