In the production of window structures, the welded corner is the most stressed area of the product. This is where errors in the recipe, incompatibility of components, or insufficient thermal stability of the material manifest themselves. Despite this, the stabilizer is often the last thing considered when analyzing the causes of defects.
During welding, the window profile is subjected to local heating, where the material’s temperature briefly exceeds the working range of extrusion. If the stabilization system fails to provide protection under such conditions, partial degradation of the polymer occurs. This leads to the formation of microcracks, reduced joint strength, and increased brittleness of the corners.
How does the stabilizer affect the strength characteristics during welding?
Optimized calcium-zinc systems work differently. They ensure the preservation of the mobility of macromolecules in the welding zone, allowing for complete fusion of the material. This prevents the polymer structure from drying out and losing its strength.
This is particularly critical for profiles with thick walls or complex chamber geometry. These structures retain heat within the material, creating internal temperature gradients. Only a balanced stabilization system can evenly distribute protection throughout the entire volume.
Practice shows that a properly selected stabilizer affects not only welding but also subsequent processing operations. Milling, drilling, and cutting cause local heating of the material. Chemically stable PVC can withstand these operations without damaging the structure or causing defects.
In the window profile segment, Reapak G-AV/9911 and Reapak G-AV/9913 systems are used to ensure strong connections, designed with the requirements of welding operations and industrial processing in mind.
