Barwell BPP-70 Continuous Cold-Feed Gear Pump Preformer
| Brand | Barwell |
|---|---|
| Origin | United Kingdom |
| Model | BPP-70 / BPP-180 / BPP-320 / BPP-550 / BPP-1200 |
| Max. Production Capacity | 70 kg/h (BPP-70) |
| Max. Gear Pump Operating Pressure | 350 bar |
| Gear Pump Speed Range | 55 rpm (BPP-70) |
| Screw Diameter | 50 mm |
| Screw L/D Ratio | 10:1 |
| Temperature Control Zones | 4 |
| Weight Accuracy | ±1% |
| Cut-off Knife Speed Range | 50–500 rpm |
| Max. Die Size | 48 mm |
Overview
The Barwell BPP-70 Continuous Cold-Feed Gear Pump Preformer is an engineered solution for high-precision rubber preforming in tire, technical rubber, and extrusion-based compound manufacturing. Unlike conventional hot-feed or batch preforming systems, the BPP-70 integrates a cold-feed single-screw extruder with a positive-displacement gear pump and synchronized high-speed rotary cut-off system. This architecture enables continuous volumetric metering of unheated, compounded rubber stock—preserving thermal history while delivering stable mass flow to the die head. The gear pump operates at up to 350 bar, enabling inline filtration and homogenization prior to shaping, thereby eliminating pressure surges typical of screw-only feeding. The system’s closed-loop control links real-time gravimetric feedback from integrated load-cell scales with pump speed and knife timing, ensuring consistent preform weight, geometry, and density across production runs.
Key Features
- Continuous cold-feed architecture with upstream single-screw extruder (50 mm diameter, L/D 10:1) for gentle, low-shear compounding and conveying without premature vulcanization
- High-pressure gear pump (rated to 350 bar) providing precise volumetric delivery, minimal pulsation (<±1% flow variation), and integrated melt filtration capability
- Synchronized servo-driven rotary cut-off system (50–500 rpm adjustable) with adaptive trigger logic tied to pump displacement and linear feed velocity
- Multi-zone temperature control (4 independent zones on BPP-70) with PID-regulated heating/cooling for accurate thermal management of barrel and adapter sections
- Real-time gravimetric feedback loop: integrated precision load cells monitor individual preform weight and dynamically adjust pump speed to maintain ±1% mass tolerance
- Modular design supporting scalable configurations—from BPP-70 (70 kg/h) to BPP-1200 (1200 kg/h)—with consistent control architecture and HMI interface
Sample Compatibility & Compliance
The BPP-70 accommodates a broad spectrum of unvulcanized elastomers including natural rubber (NR), styrene-butadiene rubber (SBR), butyl rubber (IIR), ethylene propylene diene monomer (EPDM), and thermoplastic elastomers (TPEs) with Shore A hardness ranging from 40 to 90. Feedstock may contain fillers (e.g., carbon black, silica), oils, curatives, and processing aids—provided viscosity remains within the pump’s shear-stable operating envelope. The system complies with CE Machinery Directive 2006/42/EC and conforms to ISO 13857 (safety distances) and IEC 61800-5-1 (adjustable speed electrical power drive systems). All control software adheres to IEC 61508 SIL2 functional safety requirements for critical motion sequencing.
Software & Data Management
The Barwell PreformControl™ HMI platform (Windows-based, touchscreen-enabled) provides full recipe management, real-time trend logging, and audit-ready data export (CSV/Excel). Each production batch is assigned a unique ID linked to material lot numbers, operator ID, environmental conditions (ambient temp/humidity), and full process parameter history—including pump RPM, knife phase offset, die pressure, zone temperatures, and individual preform weight deviations. Data integrity meets FDA 21 CFR Part 11 requirements via electronic signatures, role-based access control, and immutable audit trails. Optional OPC UA integration enables seamless connectivity with MES (e.g., Siemens Opcenter, Rockwell FactoryTalk) and ERP systems for traceability across the rubber manufacturing value chain.
Applications
- Tire component preforming: bead filler, sidewall gum, tread base, and apex strips with tight dimensional repeatability
- Sealing profiles and gasket preforms requiring uniform cross-section and absence of weld lines
- Automotive vibration-damping components where density consistency directly impacts dynamic modulus performance
- Medical-grade elastomer preforms (e.g., silicone tubing blanks) under ISO 13485-compliant production protocols
- R&D-scale formulation validation—enabling rapid iteration of compound rheology effects on preform integrity without batch-to-batch variability
FAQ
What distinguishes cold-feed preforming from hot-feed extrusion?
Cold-feed preforming processes rubber compounds below their scorch point, preserving curative dispersion and minimizing premature crosslinking. The gear pump ensures laminar, pulse-free flow—critical for maintaining filler orientation and avoiding re-agglomeration.
Can the BPP-70 handle highly filled compounds (e.g., >60 phr carbon black)?
Yes—its 350-bar pressure rating and optimized gear geometry accommodate high-viscosity, abrasive formulations. Optional hardened alloy gears and ceramic-coated bushings are available for extended service life.
Is remote diagnostics supported?
Standard Ethernet/IP and optional 4G LTE gateway enable secure remote monitoring, predictive maintenance alerts (via pump current harmonics analysis), and firmware updates without on-site intervention.
How is calibration traceability maintained?
Load cells are factory-calibrated per ISO/IEC 17025 and include NIST-traceable certificates. On-site verification procedures and auto-zero routines are embedded in the control firmware.
Does the system support GMP documentation packages?
Yes—validation documentation (DQ/IQ/OQ), URS templates, and 21 CFR Part 11 compliance reports are provided as part of the commissioning package for regulated environments.
