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Energy-Saving Principle of Electromagnetic Heating in Plastic Pelletizing Machines

Time：

2018-09-08

Electromagnetic heating technology utilizes the principle of electromagnetic induction to generate heat directly within the metal barrel. Depending on specific requirements, a layer of insulating and heat‑preserving material can be wrapped around the exterior of the barrel, significantly reducing heat loss and boosting thermal efficiency, thereby delivering remarkable energy savings. Since the electromagnetic heating coil itself does not generate heat and is constructed from non‑ferrous materials and high‑temperature cables, it avoids the issue of resistance wires in conventional electric heating coils oxidizing at high temperatures and shortening their service life. As a result, it offers advantages such as extended service life, rapid temperature rise, and simple maintenance. This technology has been widely adopted by numerous plastic‑processing companies, substantially lowering production costs.

Electromagnetic heating technology utilizes the principle of electromagnetic induction to generate heat directly within the metal barrel. Depending on specific requirements, a layer of insulating and heat‑preserving material can be wrapped around the exterior of the barrel, significantly reducing heat loss and boosting thermal efficiency, resulting in remarkably substantial energy savings. Since the electromagnetic heating coil itself does not generate heat and is constructed from non‑ferrous materials and high‑temperature cables, it avoids the issue of resistance wires in conventional electric heating coils oxidizing at high temperatures and thereby shortening their service life. This technology offers advantages such as an extended service life, rapid temperature rise, and straightforward maintenance, and has been widely adopted by plastic‑processing companies, substantially lowering production costs.

The electromagnetic heating system consists of two components: the electromagnetic controller and the heating coil. The power supply is rectified, filtered, and inverted into high-frequency AC by the electromagnetic controller, then transmitted via connecting cables to the electromagnetic heating coil. The high-frequency AC passes through the insulating material to heat the barrel, causing the barrel itself to generate heat. Alternatively, the power supply can be connected directly to the electromagnetic controller, with the existing temperature controller used to regulate the controller.

High‑efficiency, energy‑saving electromagnetic heating technology is applied in the energy‑intensive plastics processing sector, delivering remarkable performance and benefits. When used in plastic recycling and pelletizing applications that require substantial heating—such as direct pelletization of washed scrap—it offers greater convenience and safety compared with conventional heaters, reduces energy consumption relative to coal‑fired systems, and simultaneously boosts both output and product quality while significantly lowering electricity usage.

An electromagnetic induction heater is a device that converts electrical energy into thermal energy based on the principle of electromagnetic induction. The electromagnetic controller rectifies mains-frequency AC into DC, then inverts the DC into high-frequency, high-voltage AC. When this rapidly oscillating high-frequency, high-voltage current flows through a coil, it generates a rapidly varying alternating magnetic field. As the magnetic flux lines of this field pass through a ferromagnetic metal material, tiny eddy currents are induced within the metal, causing the material itself to heat up rapidly and thereby heating the contents inside the metal‑lined chamber.