China 2-Layer PA Tube Extrusion Line For Automobile Factory & Product

Our co-extrusion systems are engineered to run a wide range of automotive polyamides and specialized engineering polymers. Typical combinations include: PA12 (outer) / PA612 or PA6 (inner) for balanced cost-performance in engine cooling loops; Plasticized PA11 or PA12 (outer) / Conductive PA (inner with carbon nanotubes or specialty black) for electrostatic discharge fuel lines; and PA12 / Modified functional PA for SCR AdBlue transfer lines. The screw geometries and barrel metallurgy (bimetallic alloys) are specifically matched to handle the distinct melt index, processing temperatures (typically 220°C to 285°C), and rheological behaviors of each polymer layer without interfacial slip.

Interlayer bonding between two polyamide layers relies on mutual macromolecular chain interdiffusion at the melt boundary. In BAOD co-extrusion die-heads, the confluence point where the inner and outer melts merge is engineered with micro-adjustable compression land lengths and precise thermal regulation. By holding melt temperatures within ±0.5°C and maintaining laminar flow without turbulence, the polymer chains co-crystallize across the boundary. During peel testing according to SAE J2260 or DIN 73378, our co-extruded tubes exhibit cohesive material failure rather than interfacial delamination.

On typical automotive fluid tubing dimensions (such as 8 mm OD × 1.0 mm wall, or 12 mm OD × 1.25 mm wall) operating at continuous production speeds between 40 and 80 m/min, the BAOD line holds outer diameter tolerances within ±0.03 mm and total wall thickness tolerances within ±0.025 mm. This is made possible by our dynamic closed-loop feedback system linking the multi-axis laser gauge, post-tank ultrasonic wall scanner, and high-response servo puller drives.

While European extrusion systems carry premium capital price tags, BAOD delivers an exceptional Total Cost of Ownership (TCO) advantage without sacrificing precision or reliability. Founded in 2002 with roots in Taiwan engineering dating back to the Kingswel Group, BAOD operates from a 16,000 m² modern manufacturing facility in Jiangsu. We incorporate tier-1 global components (Siemens S7-1500 PLCs, Gefran melt pressure transducers, Schneider electrics, NSK/SKF bearings) while cutting capital machinery expenditure by 40% to 55%. Combined with accessible spare parts, localized commissioning assistance, and lower maintenance overhead, our clients achieve investment amortization within 12 to 18 months.

Each automotive extrusion line can be fully integrated with a comprehensive non-destructive quality assurance suite: (1) In-line gravimetric loss-in-weight hopper system to verify exact raw material consumption per meter; (2) Dual-plane or four-plane high-speed laser diameter gauges; (3) 4-probe or 8-probe immersion ultrasonic measuring stations for continuous wall thickness, concentricity, and individual layer ratio monitoring; (4) High-voltage in-line spark testers (pinhole detectors) to verify electrical insulation integrity on conductive or antistatic lines; and (5) High-speed automated scrap-marking inkjet printers tied to downstream reject-sorting gates.

Yes. The extrusion platform can be configured as a dual-purpose cell. By interchanging the downstream calibration table with a high-speed vacuum/blow-forming corrugated pipe machine equipped with internal cooling mold blocks, the line produces multi-layer PA corrugated conduits for automotive high-voltage wiring harness protection and EV battery coolant bypass lines. Changeover between smooth-bore vacuum calibration and corrugated forming can be executed in less than 2.5 hours with standardized rapid-connection water, air, and electrical couplings.

Our design and manufacturing protocols follow strict CE safety standards (EN 1114-1 for rubber and plastics extruders) and ISO 9001 quality systems. Tubes manufactured on our 2-layer PA machinery routinely pass all Tier-1 OEM validation tests under DIN 73378 (Polyamide tubing for motor vehicles), DIN 74324 (Air brake systems), SAE J2260 (Non-metallic fuel lines), SAE J844, and ISO 7628. We also assist automotive clients during their VDA 6.3 process audits by delivering complete machine qualification packages (IQ/OQ/PQ documents and full SCADA historical traceability).

Standard lead times for complete custom 2-layer co-extrusion cells range from 75 to 110 business days from approved mold and tooling drawings. Before dispatch, we conduct an extensive Factory Acceptance Test (FAT) at our Haian facility, running the customer's actual resin formulations to verify CPK values, dimensional tolerances, and mechanical output targets. Following shipment, BAOD Global Service engineers provide on-site commissioning, electrical integration, and structured operator training at customer facilities worldwide, backed by 24/7 remote VPN diagnostics through the integrated Siemens industrial routers.