Thermoplastic melt processing For injection molding meltable materials involves vibration or pulsation of melt flows to eliminate poor weld lines at melt flow contact points

摘要

Melt flows from a machine to a mold are vibrated or pulsed during injection so that a difference in their vibration enhances their penetration of each other on contact and produces a more integral joining seam at the contact interface. An Independent claim is made for a processing plant for plastic melts containing pigments and/or fillers which includes an injection molding tool whose cavity is fed by two nozzles incorporating injection valves(3,4;9,10) with control mechanisms(5-8). The valves are operated independently of the injection pressure and the control mechanism synchronizes operation of individual valves relative to each other.