A thermoregulation system of rotating metal cylinders in plants for the extrusion and conversion/transformation of plastic films includes heating elements applied to each rotating cylinder, wherein the heating elements are infrared heating elements, and wherein the rotating cylinder includes a metal tube rotating around a fixed shaft, which is rigidly connected to two side plates.

A shoe sole molding device adapted for heating and molding a foamed material into a shoe sole includes a mold seat unit, a core unit, an induction heating unit and a coil unit. The core unit is disposed in a core receiving space of the mold seat unit, and defines a cavity for receiving the foamed material. The induction heating unit is disposed around the core unit, and has magnetic permeability greater than that of the core unit. The coil unit is disposed around the induction heating unit, and provides electromagnetic wave to induce heating in the induction heating unit to heat up the core unit and the foamed material.

A thermoregulation system of rotating metal cylinders in plants for the extrusion and conversion/transformation of plastic films includes heating elements applied to each rotating cylinder, wherein the heating elements are infrared heating elements, and wherein the rotating cylinder includes a metal tube rotating around a fixed shaft, which is rigidly connected to two side plates.

A system is for thermoregulating metal rotating cylinders in applications relating to plastic film converting and extruding systems, for multiple raw polymer materials. In particular, a heating system is for a rotating cylinder, e.g., a roller of a calender or a roller of a stretching unit. The heating system is an electromagnetic induction system.