What types of plastic extrusion lines does BAOD EXTRUSION manufacture?

BAOD EXTRUSION manufactures four equipment families: precision tube/pipe extrusion lines, precision profile extrusion lines, coating extrusion lines, and individual units of extrusion lines such as extruders, vacuum sizing tanks, haul-offs, cutters and coilers.

Which industries do BAOD extrusion lines mainly serve?

The core focus is the automotive and medical industries: fuel, brake, vapor and coolant lines, corrugated conduits, TPV and PVC sealing strips, and PVC medical tubing. Lines are also supplied for detonating tube and general industrial tubing.

Can an extrusion line be customized for my tube or profile?

Yes. Each line is configured from the customer's product drawing, resin datasheet, tolerance target and required output, so screw design, die head, sizing and downstream equipment are matched to the specific product.

What information should I send to receive an accurate technical proposal?

Send the product drawing with OD, ID or profile dimensions, wall thickness and tolerance, the resin grade and datasheet, target line speed or output, layer structure, required downstream functions such as cutting or coiling, in-line inspection needs, and your local voltage and frequency.

How does BAOD EXTRUSION support overseas customers after delivery?

BAOD EXTRUSION provides installation and commissioning guidance, operator training, spare parts supply and remote technical support through its Global Service program.

How does a BAOD precision extrusion line compare with European equipment?

BAOD builds on a Taiwan-origin engineering heritage focused on precision extrusion. Buyers are advised to compare measured dimensional stability, scrap rate, automation level and service response on their own material rather than country of origin alone; BAOD supports material trials to make this comparison objective.

Industry Whitepaper & Precision Machinery Architecture

Custom TPV Knitting Tube Line Manufacturers & Factory

High-speed inline circular yarn interlocking, synchronized multi-layer cross-head co-extrusion, and dynamic melt-pressure stabilization engineered by BAOD EXTRUSION (Since 2002).

Primary Machinery Portfolio

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Turnkey manufacturing systems designed for continuous, high-yield plastic, elastomer, and composite tubing production with tight tolerance control.

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25+

Years Extrusion Machine Design

16,000m²

Haian, Jiangsu In-House Plant

65%

Energy Saving vs Rubber LCM Lines

±0.02mm

Wall Thickness Tolerance Band

Industry Macro Paradigm

Global Industrial Landscape: The Paradigm Shift from EPDM to Reinforced TPV

Dynamic fluid transfer systems across automotive, industrial automation, and construction are undergoing a permanent transition from vulcanized thermoset rubber to reinforced thermoplastic vulcanizates (TPV).

Thermal & Chemical Superiority

TPV consists of dynamically vulcanized EPDM rubber domains finely dispersed within a continuous polypropylene (PP) matrix. This dual-phase morphology provides true elastomeric recovery, operational temperature resilience from -40°C to +135°C, superior resistance to glycol coolants, and zero ozone degradation, outperforming standard flexible PVC and unreinforced polyolefins.

Elimination of Vulcanization Bottlenecks

Traditional EPDM manufacturing requires energy-intensive continuous vulcanization lines (microwave tunnels, molten salt baths, or fluidized beds) with toxic nitrosamine emissions and high scrap rates. A custom TPV knitting tube line executes continuous single-pass melt processing, achieving complete 100% in-line post-industrial recyclability and a 65% reduction in carbon footprint.

High-Burst Textile Reinforcement

While unreinforced TPV tubes suffer from radial expansion and creep rupture under elevated operating temperatures, integrating an inline circular yarn knitting unit between two precision cross-head extrusions bonds the core and outer jacket. This mechanical interlock provides burst pressures exceeding 2.5 MPa to 4.0 MPa without sacrificing flexibility.

Performance Criterion	Thermoset EPDM (Vulcanized Line)	Flexible PVC + Braided Hose	BAOD Precision TPV Knitting Tube Line
Operating Temperature	-40°C to +130°C	-10°C to +60°C (embrittles cold)	-45°C to +135°C (continuous)
Production Cycle	Multi-stage: Mix, extrude, cure, cut	Slow extrusion / Batch braiding	Continuous 1-pass co-extrusion & knit
Scrap & Sustainability	0% recyclable; crosslinked landfill	Contains plasticizers; hard to recycle	100% recyclable thermoplastically
Weight Reduction	Baseline benchmark (heaviest)	-10% vs EPDM	-28% to -35% vs conventional rubber
Ozone & Flex Fatigue	Excellent, but prone to micro-cracks	Poor; plasticizer migration	>1,000,000 cycles dynamic flex

System Architecture

Integrated Engineering Architecture of the BAOD TPV Knitting Hose Line

A fully integrated turnkey production line engineered with closed-loop tension synchronization, multi-zone thermal management, and precision circular needle knitting modules.

MODULE 01

Primary Core Extruder

Custom 38CrMoAlA nitrided screw with 30:1 L/D ratio engineered specifically for dynamic TPV plasticization without polymer shear degradation.

MODULE 02

Inner Vacuum Sizing

Stainless steel spray vacuum tank maintaining ±0.2 kPa calibration pressure to lock inner tube roundness prior to entering the knitter.

MODULE 03

Precision Circular Knitter

Multi-carrier high-speed yarn knitting machine with variable loop density control, synchronized via servo encoder with primary extrusion speed.

MODULE 04

Jacket Crosshead Extruder

Engineered self-centering crosshead die executing hot-melt encapsulation of the knitted textile layer, ensuring microscopic mechanical locking.

MODULE 05

Servo Puller & Fly-Knife

High-precision multi-belt haul-off integrated with in-line laser OD gauges and a burr-free rotary fly knife for cut-to-length accuracy within ±0.5 mm.

Closed-Loop Precision Control

Overcoming The Core Rheological Challenges of TPV Extrusion

Processing Thermoplastic Vulcanizates demands strict thermal and mechanical shear boundaries. Because TPV contains crosslinked EPDM particles suspended within a PP matrix, improper screw geometries cause shear-induced melt fractures, surface roughness, and wall thickness surges.

BAOD addresses this by deploying specialized barrier-flighted screws with low-compression mixing sections, coupled with Gefran melt pressure transducers feeding directly into Siemens S7-1500 PLC algorithms. This maintains melt pressure fluctuations within an ultra-narrow band of ±0.3 MPa, eliminating pulsation at the die lips.

L/D 28:1 - 32:1 Optimized TPV Plastification

< 0.08% Online Yarn Breakage Rate

Key Machine Parameters & Technical Limits

Applicable Tube ID: 4.0 mm up to 32.0 mm
Knitting Yarn Compatibility: Polyester (PET), Polyamide (PA66), Aramid (Kevlar)
Line Speed Capability: 5.0 to 25.0 meters/minute (depending on tube diameter)
Extruder Motor Drives: Inovance / ABB High-Torque AC Inverter Synced Motors
Die Head Centering: 4-point micro-metric adjustment with heated oil calibration
Water Cooling System: Dual-circuit 304 stainless spray tanks with chilled recirculation

Application Engineering

Localized Application Scenarios: Delivering Custom Engineering for Real-World Demands

BAOD TPV knitting tube lines are customized based on the chemical, thermal, and dynamic pressure profiles required by Tier-1 automotive and industrial OEMs.

EV Battery Cooling Lines

Thermal management systems for modern Electric Vehicles rely on water-glycol coolant running through extensive chassis loops. BAOD lines produce light, tight-radius TPV composite hoses that withstand hydrolytic oxidation at 120°C and dynamic pulsating pressures without micro-cracking or pinhole leaks.

Automotive Air Brakes & Suspension

Commercial vehicles require high-integrity pneumatic transfer lines complying with SAE J844 and DIN 74324. By interlocking high-tenacity polyester filament between virgin TPV matrices, these hoses provide cyclic pressure fatigue durability and rock-strike abrasion defense on unshielded undercarriages.

Industrial Pneumatic Assist

Automated manufacturing cells, robotic grippers, and CNC machine centers operate thousands of dynamic flex cycles daily. Our composite TPV lines produce flexible, non-marring, oil-resistant hoses that resist continuous bending fatigue and internal micro-pulsations far better than traditional polyurethane tubing.

High-End White Goods & Marine

Dishwashers, washing appliances, and marine bilge transfer lines need anti-vibration damping, sound deadening, and long-term hot detergent chemical resistance. The knitted composite construction dampens motor harmonic vibrations while stopping pump-induced fluid surges from causing pipe expansion.

Manufacturing Heritage & Quality Sovereignty

China Factory Supply Chain Resilience & Vertical In-House Control

Jiangsu Baodie Automation Equipment Co., Ltd. (BAOD EXTRUSION) builds upon precision extrusion lineage established in 2002. Operating from a dedicated 16,000 m² modern manufacturing facility in Haian, Nantong, Jiangsu, our engineering independence sets us apart from mere equipment assemblers.

By machining critical components—including nitrided bimetallic barrels, high-precision extrusion crossheads, vacuum calibration sleeves, and servo haul-off caterpillar tracks—directly on our multi-axis CNC milling centers, we eliminate outsourcing variables. This ensures strict metallurgical consistency, exact clearance tolerances (±0.005 mm), and drastically compressed delivery cycles.

Taiwan Engineering Lineage

Grounded in precision machine design from the Kingswel heritage.

Full Cluster Integration

Direct industrial cluster access to motors, drives, and metallurgy.

Technical Guarantees & Compliance Assurance

Factory Acceptance Test (FAT) With Client Resin Every custom line runs trial production under operating parameters using your actual resin pellets and yarn prior to crating.

Global Electrical & Safety Compliance (CE / UL / CSA) Integrated wiring cabinets wired according to international regional voltages (380V/480V/220V) with safety interlocks.

IoT Cloud Telemetry & Remote Commissioning Secure VPN remote diagnostic modules on every PLC allow BAOD senior software engineers to assist in troubleshooting in real time.

Next-Generation R&D

Technical Roadmap: What Lies Ahead for Composite Hose Extrusion

BAOD EXTRUSION actively invests over 7% of annual gross revenues into forward-looking mechanical automation and polymer rheological research.

AI In-Line Viscosity Self-Adaptation

Upcoming lines integrate real-time rheological feedback nozzles directly upstream from the die head. If batch-to-batch polymer melt index (MFI) shifts occur, the PLC dynamically recalibrates screw heating zone profiles in milliseconds, preserving absolute layer concentricity without manual operator intervention.

Multi-Material Hybrid Cross-Heads

Our tooling labs are currently completing validation for dual-layer co-extrusion crossheads that merge ultra-low permeation inner barrier layers (such as PA12 or EVOH) directly with flexible TPV outer skins and reinforced aramid yarn, creating non-permeable composite hoses for hydrogen and alternative fuel cooling.

Zero-Waste Circular Regrind Integration

Novel multi-stage gravimetric dosing units allow the injection of up to 30% micronized inline edge-trims and production purgings back into the outer protective jacket melt stream with zero loss of tensile burst strength or cosmetic outer gloss.

Technical Clarity

Frequently Asked Technical & Commercial Questions (FAQ)

Direct answers from BAOD engineering specialists addressing the critical variables overseas procurement and operations teams assess before equipment acquisition.

1. How does the line prevent delamination between the inner TPV core, knitted yarn, and outer jacket?

Interlayer delamination is prevented through a two-fold engineering approach. First, the outer jacket extruder utilizes a vacuum-assisted cross-head that removes trapped air between knitted yarn strands, pulling molten TPV into the microscopic interstitial spaces of the textile loop. Second, temperature at the outer die is precisely synchronized to soften the surface layer of the inner core without deforming its structural roundness, forming a direct thermal weld between inner and outer polymer chains.

2. Which knitting yarn types provide optimal cost-to-burst ratios for automotive coolant lines?

For standard automotive cooling loops (-40°C to +125°C at operating pressures of 0.2–0.4 MPa and burst requirements of 1.5–2.5 MPa), high-tenacity Polyester (PET) continuous filament (1100–1670 dtex) offers the ideal cost-to-performance ratio. For heavy-duty commercial truck applications or turbocharger auxiliary cooling exceeding 140°C and 3.5 MPa burst demands, Polyamide 66 (PA66) or Meta-Aramid yarn is utilized. Our knitting units feature tension adjustments to handle both yarn families without thread snapping.

3. Can the same extrusion line be used to process alternative polymers like PVC or TPU?

Yes, modularity is a core tenet of BAOD design. By swapping the screw and barrel assembly (adjusting compression ratio and flight clearance) and switching die heads, the line can process plasticized PVC, TPU (thermoplastic polyurethane), and specific TPE-S grades. We offer dual bimetallic screw packages machined specifically for quick switchover between TPV and alternative thermoplastics.

4. How is synchronization maintained between the primary extruder, knitter, and haul-off puller?

Synchronization is driven via a master Siemens / Schneider Profinet digital bus architecture. The primary puller and secondary haul-off use high-resolution absolute encoders linked to the knitting head servo motor. When the line speed is accelerated or decelerated from the central 15-inch HMI touchscreen, the knitter automatically adjusts its needle oscillation RPM in lockstep, ensuring the knit angle and pitch density remain completely uniform across the entire spool.

5. What are the delivery times, packaging standards, and overseas commissioning procedures?

Standard turnkey manufacturing cycle is 60 to 75 working days from engineering approval. All machinery components are vapor-barrier vacuum foil wrapped, rust-inhibited, and bolted securely within heavy-duty fumigated wooden crates suitable for sea freight. Upon port arrival, BAOD sends a dedicated commissioning engineering team for physical positioning, electrical tie-in, FAT parameter replication, and full operator training. Remote telemetry diagnostics are also standard.

6. How does BAOD guarantee inner diameter and wall thickness tolerance under dynamic pulling?

We employ an inline dual-axis or four-axis laser gauge immediately following the vacuum cooling tank that measures OD and ovality at 1,000 scans per second. This data stream feeds a closed-loop PID control algorithm that dynamically regulates haul-off caterpillar speed by fractions of a millimeter per second. Combined with high-precision melt pumps when specified, inner tube wall thickness is maintained within ±0.02 mm.

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Direct Factory Engineering Support

Consult with an Extrusion Specialist

Provide your tube drawing (OD/ID, wall thickness, yarn specifications, burst targets, and annual output). Our engineering team delivers a complete 3D layout, screw rheological profile, and detailed proposal within 24 hours.

Request Engineering Proposal Download Line Catalog