OptiCore is Quaker’s patented technology that is incorporated into its TimberLine and CityLine Window Series. OptiCore Enhanced Architectural Aluminum Frame offers maximum thermal and structural performance, according to the company. Assembly is fully automated and computer-controlled to lock each mitered frame corner to exact specifications. Sealant is robotically injected into the dual corner keys and an automated system lays down a precise glazing bead before lowering glass into frame for a consistent seal.