Introduction
The document discusses the challenges and solutions related to the thermal conductivity of aluminum window frames, particularly focusing on the development of thermal breaking profiles to improve insulation.

Specifications
The primary issue with aluminum frames is their high thermal conductivity, which can lead to condensation and frost in cold climates. The solution involves creating a thermal break by separating the frame into interior and exterior components and using a less conductive material to join them.

Material Recommendations
The recommended material for thermal breaking profiles is a thermoplastic with special features, specifically a techno-polymer based on PA 6.6 reinforced with 25% fiberglass. This material offers good insulation properties, a wide temperature application range (-30°C to +210°C), excellent mechanical properties, and a thermal expansion coefficient similar to aluminum.

Extrusion Technology
The document outlines the extrusion process for producing thermal breaking profiles. A single screw extruder is recommended for processing PA + 25% fiberglass, with a 28:1 L/D ratio for optimal material melting. Special attention is required to manage wear due to fiberglass content, necessitating special steel and treatments.

Production Process
The extrusion technology is crucial for achieving high-quality products. A sophisticated multi-exit extrusion technology is used to meet high output demands, with 4 or 8 exit dies depending on the required hourly output and profile design. Common extruders include EA 60, EA 70, and EA 90.

Conclusion
The document emphasizes the importance of experience in extrusion technology to ensure high-quality thermal breaking profiles, highlighting the need for precise control over material properties and production processes.