Views: 36 Author: Site Editor Publish Time: 2026-01-19 Origin: Site
In modern aluminum manufacturing, the aluminum extrusion machine is a core piece of equipment that directly affects product quality, production efficiency, and equipment lifespan. Aluminum profiles exit the die at extremely high temperatures, often between 450°C and 550°C, and must be conveyed, cooled, and processed continuously at high speed.
Under these demanding conditions, the felt belt plays a vital role. It protects sensitive aluminum surfaces, stabilizes conveying, absorbs vibration, and reduces thermal stress on mechanical components. With more than two decades of experience in industrial felt solutions, Calm specializes in high-density, heat-resistant felt belt systems designed specifically for aluminum extrusion applications. Our solutions help manufacturers optimize production performance while reducing surface defects and maintenance costs.
Challenge:
At the extrusion press outlet, aluminum profiles are extremely hot. Direct contact with metal tables or rollers can cause surface oxidation, burn marks, and accelerated wear of conveying equipment.
Solution:
Heat-resistant felt belts, such as Nomex felt belt and PBO felt belt, create an insulating buffer between the hot profile and the machine surface. Nomex offers long-term thermal stability up to approximately 280°C, while PBO materials withstand peak temperatures up to 600°C.
Engineering Benefit:
Testing shows that high-density Nomex felt belt systems can reduce surface temperature rise by approximately 15 to 20 percent at high-temperature contact points, significantly lowering the risk of thermal damage.
Challenge:
Aluminum profiles are highly susceptible to scratches, dents, and pressure marks during conveying, especially after surface treatments such as anodizing or polishing.
Solution:
The dense fiber structure of a felt belt provides a soft, uniform support surface. It absorbs micro-impacts and minimizes friction, protecting the aluminum surface throughout the extrusion and handling process.
Operational Result:
Customers using Calm's high-density felt belt solutions have reported up to a 30 percent reduction in surface defect rates, particularly on long and thin profiles.
Challenge:
At high line speeds, aluminum profiles can vibrate, shift, or lose alignment, which affects downstream processes such as cutting and stacking.
Solution:
Seamless felt belt construction ensures even load distribution and stable tracking. The inherent elasticity of felt absorbs vibration and reduces sudden impacts.
Performance Reference:
On extrusion lines operating at conveying speeds of up to 120 meters per minute, seamless felt belt systems maintain profile deviation below 2 millimeters, outperforming traditional roller conveyors.
Function:
The run-out table is the first support area after extrusion, where profiles are still at peak temperature.
Key Requirements:
High heat resistance, uniform thickness, and long-term dimensional stability.
Recommended Solution:
Nomex or PBO felt belt systems with densities typically ranging from 0.3 to 0.5 g/cm³.
Industry Example:
A large aluminum profile producer operating a 24-hour extrusion line achieved consistent surface quality using a 5 mm thick high-density Nomex felt belt, with no visible pressure marks.
Function:
Even during cooling, profiles remain sensitive to surface damage and deformation.
Design Considerations:
Felt belt width and thickness must be matched to profile size and cooling speed to ensure uniform support.
Material Selection:
High-density Nomex felt belt systems are commonly used, with Kevlar or PBO reinforcement in higher-temperature zones.
Function:
Smooth transition between process stages without impact or misalignment.
Design Principle:
Endless or seamless felt belt designs are preferred to eliminate joint-related vibration and tracking issues.
Operational Advantage:
Improved profile alignment, reduced noise, and lower long-term maintenance requirements.
Function:
Provide sufficient grip to control profile movement while protecting the surface.
Technical Requirement:
High-density felt belt materials that balance friction and surface softness.
Recommended Configuration:
Heat-resistant felt belt layers with thicknesses between 3 and 6 mm, combined with anti-contamination surface treatments where necessary.
Function:
Support profiles during cutting operations and absorb mechanical shock.
Technical Benefit:
The cushioning effect of felt belts reduces vibration during flying saw operations, improving cutting accuracy and extending equipment life.
Well suited for medium to high temperature zones. Offers excellent wear resistance and dimensional stability, making it ideal for run-out tables and cooling sections.
Designed for extreme temperature and load conditions. Kevlar withstands up to approximately 480°C, while PBO materials handle short-term exposure up to 600°C, making them suitable for the hottest extrusion zones.
Select materials based on temperature range, profile geometry, and line speed
Avoid over-specification to control cost
Customize belt width, thickness, and density for each process stage
Heat resistance and thermal aging stability
Wear resistance and compression recovery under continuous load
Dimensional stability and seamless construction
Smooth surface finish to protect aluminum profiles
Premature wear and frequent replacement
Surface scratches or pressure marks on aluminum profiles
Hardening or deformation under high temperature
Increased downtime and maintenance costs
Custom belt width, thickness, and density based on extrusion line layout
Application-specific material selection including Nomex, Kevlar, and PBO
Engineering support for installation and maintenance
Proven reduction in surface defects through optimized felt design
Over 20 years of industrial felt manufacturing experience with global references
The correct felt belt solution is essential for protecting aluminum surfaces, stabilizing conveying, and extending equipment life in an aluminum extrusion machine. By working with an experienced manufacturer like Calm, extrusion plants can achieve optimal material selection, precise customization, and long-term operational reliability. The result is higher efficiency, lower defect rates, and a more stable production process.
Email: toby@gdcalm.com