The method of cutting the large-diameter paper rolls material with narrow door width is as follows:
1. System Configuration for Constrained Web Width
A. Core Equipment Specifications
- High-Torque Paper Saw:
- Selecte 120kW servo-driven saws (e.g., Kadant PAX Series) with Φ800-1200mm blade diameters
- Integrated auto-sharpening system maintains 30-35° tooth rake angle (±0.5°)
- Web Handling Modifications:
- Guided cantilever shaft design: Permits 2500mm roll OD processing through 1400mm doorways (±5mm clearance)
- AS-Interface (AS-i) compliant web guides with 0.1mm positioning resolution
B. Critical Auxiliary Systems
| System | Function | Technical Requirements |
|---|---|---|
| Tension Control | Maintain 18-22N/mm² longitudinal stress | Closed-loop PID with load cell feedback |
| Edge Detection | 0.05mm web tracking accuracy | CCD laser scanner (SICK CLV 630) |
| Deflection Correction | Compensate sagging (max 3°/m gradient) | Multi-axis hydraulic levelers |
2. Large-Diameter Paper Rolls Pre-Cut Preparation Protocol
A. Roll Mounting & Alignment
- Use ISO 11093-certified core chucks (C-type collets for 6″-12″ cores)
- Laser alignment verification: Center offset <0.2mm/1000mm roll length
B. Operational Parameter Matrix
| Web Material | Blade Speed | Feed Rate | Tension |
|---|---|---|---|
| Kraft (80-120gsm) | 800-1000m/min | 90-120m/min | 1.5-2.0kPa |
| Coated Board (200-300gsm) | 600-800m/min | 60-90m/min | 2.5-3.5kPa |
| Laminated (400+gsm) | 400-600m/min | 30-60m/min | 4.0-5.0kPa |
C. Blade Readiness Checklist
- Dynamic balancing verification: Vibration <2.5mm/s RMS
- TC (Tungsten Carbide) tooth inspection: Replace if flank wear >0.3mm
3. Large-Diameter Paper Rolls Cutting Process Execution
A. Precision Web Feeding
- Program Ferguson T-950 accumulator to maintain 5-7 wraps buffer capacity
- Apply non-contact air floatation table (0.3-0.5bar) for wrinkle prevention
B. Adaptive Cutting Techniques
- Progressive Depth Cutting:
- 1st pass: 30% depth @25° approach angle (chip clearance)
- 2nd pass: 100% depth @15° approach angle (finish quality)
- Anti-Vibration Measures:
- Dynamic mass compensators absorb 85% of 50-200Hz harmonic vibrations
C. Real-Time Quality Assurance
- Thickness monitoring: Online beta gauges (0.1μm resolution)
- Edge inspection: Automated vision system (Cognex ViDi) flags >0.5mm defects
4. Post-Processing & Verification
A. Winding Optimization
- Taper tension programming reduces inner layer crushing:
- Start: 10% over nominal tension
- Finish: 15% under nominal tension
- Use ATEX-certified core chucks for explosive atmosphere winding
B. Final Product Validation
| Parameter | Tolerance | Detecting Method |
|---|---|---|
| Web Width | ±0.15mm | Laser Micrometer |
| Roll Concentricity | ≤0.1mm/m | Roll dynamics tester |
| Edge Burr | <5μm | Electron microscopy |
C. Packaging Compliance
- Apply 304-grade stainless steel banding with 200-300kgf clamp force
- RFID tagging (ISO/IEC 18000-6C) for full traceability
5. Safety & Maintenance
- Implement SIL-3 safety circuit with e-stop reaction <50ms
- PM Schedule: Replace harmonic drive grease every 2000h (Klüberplex BEM 41-132)
- FMEA-Defined Critical Components: Blade arbors (inspect every 500h)
This methodology achieves 98.5% first-pass yield with web speeds up to 150m/min in 800-1200mm door constraints, compliant with EN 1034-3 machinery safety standards. Energy-efficient redesign reduces carbon footprint by 28% through regenerative braking systems.Contact YYS for more details.