Abstract: A flow head and a method for use with a blow molding apparatus. The flow head includes a flow head housing with a material flow cavity. The flow head housing includes a movable die pin mechanism which is moveable between an open position and a closed position. A main melt pipe is connected to the material flow cavity. The main melt pipe is maintained at a first temperature. A shot chamber mechanism is connected to the material flow cavity. The shot chamber mechanism is maintained at a second temperature, which is lower than the first temperature. Thermoplastic material is formed into a parison for the blow molding apparatus. As the movable die pin mechanism is positioned in the closed position, the thermoplastic material is moved to the shot chamber to prevent degradation of the thermoplastic material.

Abstract: A method of co-extruding material. The method includes controlling the flow of a first extruded material to an infeed of a die by a first plunger positioned in a first material delivery channel; moving the first plunger between a first plunger first position and a first plunger second position, the first plunger creating a vacuum or area of low pressure as the first plunger is moved from the first plunger first position to the first plunger second position; controlling the flow of a second extruded material to the infeed of the die by a second plunger positioned in a second material delivery channel; moving the second plunger between a second plunger first position and a second plunger second position, the second plunger creating a vacuum or area of low pressure as the second plunger is moved from the second plunger first position to the second plunger second position.

Abstract: A co-injection extrusion apparatus and method. The first extruder cooperates with a first material delivery channel for delivering a first material to a die. The second extruder cooperates with a second material delivery channel for delivering a second material to a die. A first plunger is positioned in the first material delivery channel and a second plunger is positioned in the second material delivery channel. The plungers are movable between a first position in which to the plunger is extended in a respective material delivery channel toward the die, and a second position in which the plunger is retracted in the respective material delivery channel away from the die.

Abstract: A co-injection extrusion apparatus and method. The first extruder cooperates with a first material delivery channel for delivering a first material to a die. The second extruder cooperates with a second material delivery channel for delivering a second material to a die. A first plunger is positioned in the first material delivery channel and a second plunger is positioned in the second material delivery channel. The plungers are movable between a first position in which to the plunger is extended in a respective material delivery channel toward the die, and a second position in which the plunger is retracted in the respective material delivery channel away from the die.

Abstract: A vertical rotary blow molding machine with dual cavity molds includes two coextrusion flow heads for extruding multi-layer parisons for capture and blowing in the dual cavity molds.