Induction preheater for precise heating of cable conductors

ZUMBACH PREHEATER

In-Line Induction

In-line inductive wire preheating enhances productivity and product quality. Repeatable and uniform conductor temperature helps shorten start-up times and reduce scrap production. Many compounds can only be extruded onto an adequately preheated conductor.

Main benefits of wire preheating: 

• Better product quality and improved consistency

• Dielectric properties of the insulation material are more uniform and the process conditions are reproducible (important for category type data wires)

• Improved cell structure in case of foamed and foam/skin insulating material

• Higher line speeds are possible thanks to lower stress within the insulation materials

• Shorter start-up times = less scrap

• Preheating allows control of the bonding of the insulation material to the conductor

• Uniform conductor temperature maintained even during ramping phases

• Lasting improvements of the Cpk value

• The aging characteristics of the insulation are improved substantially through better uniformity (reduced risk of insulation cracking due to mechanical stress, e.g. bending of the wire)

• Oil and water residues on the conductor surface are cleaned away by evaporation

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