초록 ▼

In a process for the simultaneous manufacturing of a plurality of injection-molded micro parts from thermoplastic or cross-linking polymers in an injection molding tool, an injection device is provided which has injection cylinders, injection pistons and temperable antechambers. The plastic melt com

In a process for the simultaneous manufacturing of a plurality of injection-molded micro parts from thermoplastic or cross-linking polymers in an injection molding tool, an injection device is provided which has injection cylinders, injection pistons and temperable antechambers. The plastic melt coming from a conveyor worm, by way of temperable sprues, first arrives in the antechambers and, in a second step, is supplied by the injection pistons by way of the injection nozzles to the mold cavities. The mold cavities are filled independently of one another. The co-solidifying runners are eliminated, and it is possible to manufacture particularly small parts with a low injection volume at particularly reasonable cost.

대표청구항 ▼

[ What is claimed is:] [1.] A process for the simultaneous manufacturing of a plurality of injection-molded micro parts in an injection molding tool having a sprue block with temperable channels for a free-flowing material and further having a mold block with a plurality of mold cavities,wherein a s

[ What is claimed is:] [1.] A process for the simultaneous manufacturing of a plurality of injection-molded micro parts in an injection molding tool having a sprue block with temperable channels for a free-flowing material and further having a mold block with a plurality of mold cavities,wherein a single outlet duct of an injection nozzle is assigned to each mold cavity and the material conveyed by a charging device is, in a first step, charged through open sprues, each of which directly couples the charging device to a respective antechamber having a volume corresponding to an assigned mold cavity, an outlet of the antechamber forming an inlet of the injection nozzle, said cavity not being reached by the material in this first step while the antechambers are charged jointly,wherein, in a second step, injection pistons arranged in the antechambers jointly press the material through the injection nozzles into the mold cavities to completely fill the mold cavities, the injection pressure generated by the injection pistons being independent of the conveying pressure of the charging device, andwherein the injection nozzles are closed after each injection by closing elements arranged in each of the injection pistons once the mold cavities are completely filled.