Complete Door Frame System Solutions
- Upper and Lower Sash Assemblies
Structural elements formed with high-strength rollforming techniques for rigidity, crash performance, and long-term durability. - Sash Moldings
External or internal trim that complements the vehicle’s design, rollformed or extruded with class-A surface quality. - Glass Guide Channels
Precision-formed channels that guide and seal the window glass, designed to reduce noise and ensure smooth operation. - Weatherstrip Inners and Beltline Moldings
Sealing components that protect against water intrusion and wind noise, critical to cabin comfort and system performance. - Trim and Roof Moldings, Windshield Moldings
Formed and extruded solutions that align with adjacent panels, enabling seamless design transitions and proper drainage.
Each of these components plays a role in the door system’s structural, acoustic, and aesthetic performance. Together, they must work in perfect harmony — which is why OEMs choose suppliers who can ensure system-level fit and finish.
Rollforming and Extrusion for Strength and Design Precision
Katayama specializes in precision rollforming and polymer extrusion, using in-line processing and advanced simulation to deliver consistently accurate parts at high volumes. For sash assemblies and moldings, our rollforming lines are engineered for continuous production of long, complex profiles with minimal variation — supporting high-strength steels and coated substrates.
For glass channels and inner seals, we leverage extrusion technologies suited to thermoplastics and elastomers, ensuring flexibility and sealing integrity across temperature and motion cycles.
Advanced Joining and Assembly Capabilities
Our door frame and window systems often require secondary processing beyond forming. Katayama integrates:
- Robotic and manual welding for frame joining
- Overmolding and dual-shot extrusion for hybrid assemblies
- Automated piercing, notching, and end-forming to reduce downstream operations
In Shelbyville, Kentucky and Querétaro, Mexico, our production lines are built for scale and speed — supporting multi-platform OEM programs and just-in-time delivery across North America.
Designed for OEM Efficiency
OEMs today face greater pressure to deliver precision with flexibility. That’s why Katayama’s production system is built on:
- Modular tooling strategies to support platform variation
- Integrated quality assurance with in-line inspection and traceability
- Lean workflows and cell-based layouts for responsiveness and uptime
From launch support to EDI integration and production ramp-up, our team operates as an extension of your engineering and supply chain functions.
