Extruder wire and cable die

Two types of cross-head dies are used for wire and cable coating. The first type is an annular flow or tubing die, where a thin-walled tube is extruded and the molten tube drawn onto the conductor by vacuum after it leaves the die. The vacuum is applied through the clearance between the conductor and the guide, which is usually of the order of 0.2 mm. Tubing dies are commonly used for jacketing cables or coating very thin wires with polymer melts that are very viscous. 

Extruder thermoplastics. Extruders are polymer mixers or reactors that push molten polymer through a die. The die configuration is chosen to produce blown film, coatings, sheets, monofilaments, coatings for wire and cable, cast film or special shapes like siding, downspouts. Three general types single screw, vented and twin screw. 

A die with a round opening produces pipe a square die opening produces a square profile, etc. Other continuous shapes, such as the film, sheet, rods, tubing, and filaments, can be produced with appropriate dies. Extruders are also used to apply insulation and jacketing to wire and cable and to coat substrates such as paper, cloth, and foil. 

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