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.

A method of manufacturing an extrusion die (102, 152, 302). The method comprises providing the extrusion die (102, 152, 302), the extrusion die (102, 152, 302) having a plurality of die pins (154, 316) defining a plurality of slots (156, 320), the plurality of die pins (154, 316) having an initial die pin width and an initial die pin depth and the plurality of slots having an initial slot width (Ws) and an initial slot depth (Ds), providing a micro-milling machine (104) with a spindle (122), providing a micro-cutting tool (120) coupled to the spindle (122), mounting the extrusion die (102, 152, 302) proximate the micro-cutting tool (120), and removing material from one or more die pins (154, 316) using the micro-cutting tool (120), the micro-cutting tool (120) making one or more cutting passes against the one or more die pins (154, 316) to remove the material. Micro-milling apparatuses and further methods are provided, as are other aspects.

A method of manufacturing an extrusion die (102, 152, 302). The method comprises providing the extrusion die (102, 152, 302), the extrusion die (102, 152, 302) having a plurality of die pins (154, 316) defining a plurality of slots (156, 320), the plurality of die pins (154, 316) having an initial die pin width and an initial die pin depth and the plurality of slots having an initial slot width (Ws) and an initial slot depth (Ds), providing a micro-milling machine (104) with a spindle (122), providing a micro-cutting tool (120) coupled to the spindle (122), mounting the extrusion die (102, 152, 302) proximate the micro-cutting tool (120), and removing material from one or more die pins (154, 316) using the micro-cutting tool (120), the micro-cutting tool (120) making one or more cutting passes against the one or more die pins (154, 316) to remove the material. Micro-milling apparatuses and further methods are provided, as are other aspects.

There is provided a die plate, a resin machine, and a method of heating nozzles of the die plate that can suppress temperature unevenness of the nozzles and increase the temperature rise performance of the nozzles. The die plate includes a nozzle group including a plurality of nozzles through which molten resin passes, and a heating medium guidance part that guides a heating medium for heating a nozzle wall of each nozzle. The heating medium guidance part includes an inlet that receives the heating medium, an outlet that discharges the heating medium from a heating medium channel, and a guidance wall that defines a heating channel that causes the inlet and the outlet to be in communication with each other together with an outer peripheral surface of the nozzle wall of each of the plurality of nozzles.

There is provided a die plate, a resin machine, and a method of heating nozzles of the die plate that can suppress temperature unevenness of the nozzles and increase the temperature rise performance of the nozzles. The die plate includes a nozzle group including a plurality of nozzles through which molten resin passes, and a heating medium guidance part that guides a heating medium for heating a nozzle wall of each nozzle. The heating medium guidance part includes an inlet that receives the heating medium, an outlet that discharges the heating medium from a heating medium channel, and a guidance wall that defines a heating channel that causes the inlet and the outlet to be in communication with each other together with an outer peripheral surface of the nozzle wall of each of the plurality of nozzles.

A blow-molding machine includes an extruder, a manifold, and at least one die head having a view-stripe spider. The manifold is coupled to the extruder. The die head is coupled to the manifold. The blow-molding machine is configured to form a blow-molded container including a container body and a view stripe using the die head.

An apparatus and method for processing grain material to generate a consistently high densified grain with a desired length, shape and size. The densified grain processing apparatus comprises a die assembly, a cooling assembly and a break-off assembly. The method includes receiving the grain material by the die assembly and forcing the grain material through an extrusion passageway that evenly distributes the grain material into a plurality of orifices thereby producing a high density shaped grain before the grain material exits the die assembly. A coolant is pumped to a coolant passage by means of an at least one pump and cools the shaped grain by passing the shaped grain through at least one of the cooling tube inside a cooling chamber. The break-off assembly then breaks off a predetermined length of the shaped grain.

A nozzle is provided for controlling the flow of extruded material, such as e.g., rubber material, from an extrusion machine. Movable pins are positioned into the path of material flow through an internal cavity. The pins are arranged across the path of flow upstream of the extrusion die. By moving the pins in and out, the flow of material through the cavity can be controlled at different locations across the width of the path of flow to the die. Manual and automatic controls can be provided for determining the position of the pins and thereby controlling the flow.

Foam slabs and methods and apparatus, including foaming dies, for making and using foam slabs.

An apparatus for extruding a jacket and/or insulative material onto an extruded product with one or more longitudinal stripes incorporated onto the surface of said extruded product comprising a body, a primary feed conduit for conveying a primary extrusion material, a striping die, a secondary feed conduit for conveying a secondary extrusion material, a striping die adapter, a striping feed conduit extending through the striping die adapter for conveying striping extrusion material. The striping die adapter may also include a thermocouple for maintaining the viscosity of the striping extrusion material and a thermocouple for monitoring the temperature of said striping die adapter. The striping die includes one or more striping extrusion outlets for conveying striping extrusion material onto the extruded product. The striping die may also include a wishbone-shaped trough for delivering equal amounts of striping extrusion material to said extrusion outlets for extrusion onto the product.