Non-standard insulation strips have poor quality, lack standardization and performance, and do not comply with regulations. National standard insulation strips have pure materials and meet the parameters, which are suitable for domestic conventional projects. European standard base materials are the same as national standards, but the standards for durability, precision, and stability are higher, and they are suitable for high-end doors and windows. The three are the hierarchical differences of a complete technical system and are important criteria for material selection in engineering.
Completing the processing of custom thermal barrier strip extrusion dies does not finalize product development. New dies must undergo strict trials, sample inspection, profile fitting verification and parameter optimization before formal mass production. Common defects including dimensional deviation, warpage and assembly mismatch can be corrected via process adjustment or targeted die rework. This article summarizes the complete post-development workflow of new extrusion molds, covering trial operation, defect troubleshooting and qualified validation. It also proposes standardized control measures for batch production, mold maintenance and batch consistency. Strict trial verification and continuous mold wear monitoring ensure stable, high-quality PA66-GF25 thermal barrier strips that meet dimensional, mechanical and assembly requirements.
his article analyzes shrinkage of PA66GF25 glass-fiber-reinforced polyamide thermal barrier strips. These semi-crystalline extruded profiles experience thermal and crystallization shrinkage complying with GB/T 23615.1-2017. Shrinkage stability depends on raw material formulation. 25% glass fiber suppresses shrinkage, whereas recycled materials, poor fiber dispersion and excess fillers induce uneven shrinkage and residual stress. Improper extrusion, cooling and uneven cross-sections cause deformation. Slight aging shrinkage appears 7–15 days post-production, creating assembly risks. Shrinkage results from materials, formula, extrusion and cooling. Stable raw materials and processes control shrinkage and secure dimensional accuracy.
This article analyzes the four main causes of surface blemishes in the extrusion production of ‘PA66 fiber insulation strips’: unstable raw material composition, insufficient drying, imbalance in the extrusion plasticization process, and abnormality in the mold and cooling and shaping system. It also introduces the methods for distinguishing and judging these blemishes, and points out that by strictly controlling the raw materials, processes, and mold maintenance, this appearance defect can be reduced at the source.
With the upgrading of high-end and minimalist broken-bridge aluminum doors and windows, custom-colored thermal insulation strips have become key aesthetic and differentiated accessories, while widespread market irregularities have caused various performance defects. This paper summarizes the application value of colored thermal insulation strips, analyzes typical industry misconceptions, and identifies common counterfeiting behaviors including surface dyeing, recycled material concealment and unreasonable formula adjustment. It proposes intuitive and effective quality inspection methods and clarifies the positive industry significance of standardized color customization. The study aims to distinguish qualified integrally colored products from inferior counterfeits, guide standardized production and selection, and balance the aesthetic upgrade and structural safety of door and window thermal insulation strips.
This paper investigates the performance failures of PA66 thermal insulation strips caused by impure raw materials commonly used in the industry. Compared with pure virgin PA66 featuring stable structure and over 20-year service life, strips blended with recycled materials and inferior fillers suffer severe structural defects, including accelerated thermal-ultraviolet aging, hydrolysis deterioration and temperature fatigue failure. Such defects lead to premature aging, structural fracture, failed building energy conservation and hidden engineering safety hazards. This study verifies that strict raw material purification and standardized virgin PA66 production are essential to guarantee long-term durability and stabilize the quality of thermal-break window systems.