Thermally broken window profiles for an overseas apartment project

An overseas window contractor needed profile components for a commercial apartment development. Guantian supplied outer-frame and sash sections, mullions, glazing beads and sliding tracks in specified lengths. Thermal-break strip assembly and powder coating were completed before delivery. Matching hardware and sealing gaskets were supplied for the customer's window assembly.

The customer required high levels of airtightness and watertightness in the assembled windows, as well as efficient frame assembly at the overseas site. The original drawings reused an existing local profile design without allowing for the thicker exterior powder coating in the hardware and gasket channels. The thermally broken sections also needed to maintain the correct mating dimensions after strip insertion and rolling. Excessive dimensional variation could make corner cleats or gaskets difficult to install.

The project used 6063-T5 aluminum. Before die manufacture, Guantian's engineers reviewed the sourced rollers, handles, corner cleats and EPDM gasket samples, then recalculated assembly clearances and glazing allowances. On this project's die drawing, each side of the relevant hardware and gasket channels was widened by 0.15 mm to allow for the coating. A partner die maker revised and produced the dies. Guantian completed extrusion, insertion and rolling of glass-fiber-reinforced PA66 thermal-break strips, and textured gray exterior powder coating in-house. Profiles supplied together were checked for color consistency. The channel allowance was specific to the approved cross-section and finish.

After the extrusion trial, the engineering team selected the first coated profile samples and trial-fitted the actual corner cleats, gaskets and rollers in the factory. Corner specimens cut at 45 degrees were used to check squareness. Once the gaskets fitted smoothly and the locking interfaces engaged correctly, the assembled trial corner and color sample were sent to the customer for signed approval.

Production batches were inspected and accepted against the approved die drawings and retained samples. Quality inspectors used an eddy-current thickness gauge to sample-check the powder coating against the project's 60–80 µm requirement. Matching hardware and gaskets were used for batch fit checks of the channels and the width across the thermal-break assembly. All visible surfaces were visually inspected. Accepted profiles were protected with thicker film, wrapped with protective foam at both ends, and packed with separately labeled hardware and gaskets for shipment. The customer reported smooth frame assembly after delivery.

Provide profile cross-section drawings, opening types, frame-to-sash interfaces, glass thickness and required lengths. Include specifications or samples for hardware, gaskets and thermal-break strips, along with the proposed coating, quantities and packaging requirements. Identify critical dimensions and specify whether they apply before or after finishing. Assembly requirements and any complete-system performance testing should be agreed separately for the project.