Automotive Carbon Fiber B-Pillar HP-RTM Line in China

Illustration notice. Process illustrations are not verified photographs of this installation.

Project reference basis. Figures and configuration details are reported in the supplied project brief. They are reference values for the stated application, rather than verified acceptance results or a guarantee for another installation. Confirm the source records, material, tooling, operating schedule and test method when assessing a comparable project.

Haifeng successfully engineered and commissioned an automated High-Pressure Resin Transfer Molding (HP-RTM) production line for a premier Chinese automotive composite manufacturer, slashing body-in-white B-pillar component weight by 60% with structural performance evaluated under the component program. The project covered the turnkey delivery of specialized high-pressure dual-component resin dosing units, dynamic mold vacuum control skids, and digital interface coordination for the customer's high-tonnage composite press.

Prior to commissioning, the manufacturer struggled with manufacturing cadence and quality consistency using conventional composite infusion. Liquid resin penetration across dense, multi-layer carbon fiber preforms took up to 40 minutes per part and frequently developed microscopic dry spots that failed rigorous side-impact crash simulations. The client required an industrial-scale manufacturing system capable of injecting fast-curing polyurethane resins at extreme pressures (up to 150 bar) into a vacuum-evacuated mold, locking stoichiometric accuracy within ±0.5% and compressing part cycle times down to 3 minutes.

Operational since October 2025 on a continuous two-shift production schedule across a 300 m² footprint, the workcell delivers consistent component repeatability. By deploying Haifeng's closed-loop Ratio Lock flow algorithms and high-velocity impingement injection heads, the client reliably manufactures carbon-fiber B-pillars for the stated component qualification program.

Planning a related production line

Use this record as an application-specific reference. Reinforcement introduction, resin chemistry, tooling, consolidation and qualification differ between RIM, LFI, SMC and HP-RTM. A result from one process does not establish performance of another.

Production brief for technical discussion

Provide a finished-product drawing or sample, material data, target output, automation needs and factory conditions. Haifeng will review the process, equipment interfaces and acceptance plan for your own production goals.

Concept illustration — not a photograph of delivered equipment or a customer installation.

The reported 60% weight reduction concerns this project’s B-pillar component and its conventional ultra-high-strength steel assembly baseline. The 3-minute value covers preform loading through the demolded part, not injection or cure alone. The recorded zero dry spots is an observation for the inspected project parts, not a universal zero-defect guarantee. Component and vehicle crash qualification remain distinct from machine acceptance.

Haifeng deployed a heavy-capacity HP-RTM injection architecture engineered for rapid cavity wet-out and fast-reacting structural formulations, coordinating the reported 3-minute complete molding/demolding cycle for this project configuration:
1. Closed-Loop High-Pressure Metering: Servo-driven axial displacement pumps meter resin and hardener at up to 150 bar with ±0.5% stoichiometric precision, coordinating resin flow for the stated 55% fiber-volume configuration.
2. Deep Vacuum Evacuation System: An integrated high-vacuum pump pulls mold cavity pressure down to <10 mbar before injection begins, supporting control of entrained air; part defects require inspection.
3. Multi-Circuit Dynamic Thermal Stability: Specialized TCU units actively stabilize mold half temperatures within ±0.8°C, accelerating polymerization while managing the intense exothermic heat spike.
4. Self-Cleaning High-Pressure Injection Head: An L-shaped impingement mixing head mounted directly to the tool executes instantaneous 0.3-second mechanical clean cut-offs without chemical solvent flushes.