Abstract: An injection molding machine having a side-injection sub-assembly and a method for providing access to a hot passage distributor system therein. The injection molding machine includes a side-injection sub-assembly having an injection mold part and the hot passage distributor system. The hot passage distributor system is sandwiched between the injection mold part and a head plate by two or more bolt members, which attach the injection mold part to the head plate and are accessible from a side of the injection mold part. The injection molding machine further includes an ejection mold part for releasably mating to the injection mold part and defining a mold cavity.

Abstract: An injection molding machine (F) having a side-injection sub-assembly (30) and a method for readily providing access to a hot passage distributor system (40) contained therein are provided. The injection molding machine (F) includes a side-injection sub-assembly (30) having a tool injection part (B) and a hot passage distributor system (40). The hot passage distributor system (40) is sandwiched and fixedly held between the tool injection part (B) and a head plate (D). Specifically, two or more bolt members (10) attach the tool injection part (B) to the head plate (D) and are accessible from a side of the tool injection part (B). In that regard, these bolt members (10) can be detached to remove the tool injection part (B) from the hot passage distributor system (40) and provide access thereto. The injection molding machine (F) further includes a tool ejection part (A) for releasably mating to the tool injection part (B) and defining a mold cavity (28).

Abstract: A pneumatic control device for needle valves in injection molding systems. The control device has a control piston, a needle valve, a control cylinder and a cylindrical receptacle in which the control cylinder is positioned. The needle valve is adjustably secured to the piston. The control cylinder has channels for supplying and removal of pressure gas from two cylindrical chambers separated by the control piston. The control cylinder is firmly positioned against the surface of the recess in which it is situated. A plurality of seals positioned between the contact surfaces define two chambers separated from one another. A pressure gas channel is connected to each of the chambers for supply and removal of pressurized gas into and out of the chambers which control the movement of the control piston and thus the needle valve.

Abstract: A clamping mechanism for a hot-runner manifold (1) used for injection molding is provided. Screws (11) are used to hold the manifold (1) to a mold plate (7). The screws (11) are attached to clamping members (17) which, in turn, are connected to the manifold. The clamping members (17) include socket portions (21) which are positioned in circular recesses (13) in the manifold. The clamping members (17) can undergo limited pivotal movement due to thermal expansion of the manifold during use.

Abstract: A hot passage nozzle system including a manifold block, nozzle plate and one or more sprue bushings. At one end the sprue bushings are screwed into mating receptacles in the manifold block and centered at the exit openings of the material passageways in the block. The other ends of the sprue bushings are centered in the nozzle plate. The sprue bushings have annular grooves adjacent the connection with the manifold block creating points of flexure in order to accommodate dimensional changes due to temperature changes during use, and also to accommodate manufacturing tolerances.

Abstract: Nozzle for synthetic plastic injection molding machines made up of a shaft including a flow channel for plastic material and equipped with a tip. The flow channel is divided so that the plastic flows in two partial channels prior to reaching the tip. The shaft is made of a tube segment. The forward frontal orifice of the tube segment has a small plate tapering into a point. The point protrudes past the shaft. The tube segment at its frontal orifice has both an internal and an external turned recess. The internal recess serves as a seat for the small plate. The external recess serves as a seat for a nozzle cap, which comprises the injector orifice of the nozzle and serves to hold the small plate in place. The small plate has a shoulder at the transition to the tapering area to serve as a contact surface for a corresponding shoulder formed in the nozzle cap.