What's the Hot-runner Spring Heater/Coil Heater 1？
The core definition of the (Hot-runner) Spring Heater/Coil Heater
Industrial Hot-runner Spring Heaters (also known as spring heating rings) are crucial heating components in plastic injection molding. Their core function is to provide precise and stable heating for components such as nozzles and channels in the hot runner system.
The Working Principle of Hot-runner Spring Heater/Coil Heater
Its working principle is based on resistance heating. The core structure is usually a metal tube (such as stainless steel) with a built-in heating wire inside, and it is filled with magnesium oxide powder for insulation and heat conduction. This heating tube is processed into a tightly wound spiral spring shape.
After being powered on, the resistance wire heats up, and the heat is conducted away through the magnesium powder and the metal casing. Its unique spring design brings about two key advantages:
1. Close Fit: The spring shape endows it with elasticity, enabling it to tightly wrap or embed into irregularly shaped hot runners or nozzle surfaces, reducing air gaps and achieving efficient heat conduction.
2. Uniform Heating: This close contact ensures that heat can be evenly transferred to the heated components, avoiding local overheating or insufficient heating, which is crucial for maintaining the temperature stability of the plastic melt.
Main technical specifications of the Hot-runner Spring Heater/Coil Heater
Core features and structure
· Working principle: Resistance heating.
· Structural form: Spiral spring-like, with circular or square cross-sections.
· Key design: Elastic structure to ensure close fit.
· Internal materials: Resistance wire, high-purity magnesium oxide powder (insulating and heat-conductive), stainless steel or nickel-chromium alloy sleeves.
Typical technical parameters
· Working voltage: Commonly 220V, also available in 380V and other models.
· Power range: Wide, from 115W to over 3000W.
· Size range: Inner diameter approximately 10-42mm, length (height) 30-300mm.
· Temperature control accessories: Can integrate K-type or J-type thermocouples to achieve closed-loop temperature control.