Injection molding unit producing even small moldings with greatest accuracy, quality and dimensional stability

摘要

The first piston (6) is located between extruder (10) and transfer cylinder. Through the first actuator (3) it is possible to move the extruder and the first piston together. Preferred features: The first piston (6) also forms the plug of the non return valve (13) between the transfer cylinder (9) and the extruder (10). When the piston (6) moves towards the extruder (10), the valve is closed. A second form of blocking valve is located between transfer cylinder and outlet (12). This has a second piston (7) acting as a valve plug, closing as it moves towards the outlet. Outlet channel (11, 11, 11) axes coincide. Pistons have the same diameters. A first actuator (3) brings facing piston ends together; it comprises a piston-cylinder unit and has an adjustable return stroke. This is set by the adjustment screw (5) which contacts a stop surface. It is screwed onto a threaded flange (16) forming part of the extruder. The threaded flange is held by a bridging section (4), connecting extruder and transfer cylinder.