What’s the difference between aluminum mica heating rings ,ceramic heating rings and aluminum casting heating ring?

Comparison Dimension

Aluminum Plate Mica Heating rings

Ceramic Heatingrings

Cast Aluminum Heatingrings

Photos

Heating Efficiency

Good. Mica has excellent thermal conductivity, and the aluminum plate ensures uniform heat transfer; heats up faster than cast aluminum but slightly slower than ceramic.

Excellent. Ceramic material has high thermal conductivity and low heat loss, enabling rapid temperature rise and high heat utilization rate.

Moderate. The dense structure of cast aluminum leads to relatively slow heat conduction; heat-up speed is slower than the other two types.

Temperature Uniformity

Good. The aluminum plate acts as a heat-diffusing layer, reducing local temperature differences; suitable for parts (like screws) requiring stable temperature.

Moderate. Easy to have local overheating due to the brittleness of ceramic (prone to small cracks affecting heat distribution); needs proper installation to avoid unevenness.

Excellent. Cast aluminum has good heat storage and heat dissipation performance, maintaining consistent temperature over the entire heating surface; ideal for die heads with high uniformity requirements.

High-Temperature Resistance

Moderate. Long-term use temperature is generally 0-350°C; mica may degrade slightly at higher temperatures, affecting service life.

Excellent. Can withstand long-term use at0-400°C; stable performance even in high-temperature environments (e.g., tee joints for high-melt-index materials).

Moderate. Long-term use temperature is around0-300°C; excessive high temperature may cause slight deformation of the aluminum structure, reducing heating stability.

Mechanical Strength & Durability

Moderate. The aluminum plate is flexible but prone to deformation if collided; mica is brittle and may crack if subjected to strong impact, requiring careful handling during installation/maintenance.

Poor. Ceramic is highly brittle and easy to break when hit or vibrated; not suitable for parts with frequent mechanical vibration (e.g., screws during operation).

Excellent. Cast aluminum has high hardness and impact resistance; not easy to deform or damage under normal working conditions; longest service life among the three.

Installation & Maintenance

Easy. Lightweight and flexible, suitable for curved surfaces (like screw barrels); replacement is simple, but needs to avoid damaging the mica layer during disassembly.

Difficult. Brittle and requires precise alignment during installation to prevent cracking; replacement is cumbersome, and broken ceramic fragments need to be cleaned thoroughly to avoid affecting equipment.

Moderate. Heavy weight makes installation require more labor; the fixed structure (often with mounting holes) ensures stable installation; maintenance is simple, mainly focusing on surface cleaning.

Cost

Low to moderate. Mica and aluminum are common materials; production costs are relatively low, making them cost-effective for general blown film machine parts.

High. High-purity ceramic materials and complex processing technology lead to higher costs; suitable for high-demand, high-temperature working conditions.

Moderate to high. Cast aluminum requires precision casting processes; costs are higher than aluminum plate mica but lower than ceramic (depending on product specifications).

Suitable Application in Blown Film Machines

Screw barrels (general polyethylene, polypropylene materials) where temperature requirements are not extremely high and cost control is needed.

Tee joints or die heads for processing high-temperature-resistant materials (e.g., PET, nylon) that require rapid heating and corrosion resistance.

Die heads (especially for thin-film production requiring strict temperature uniformity) and high-load working parts that need good durability.