Slitting Process — Setup, Parameters & Quality Control
A practical engineering reference for slitting process setup, parameter selection, and quality control in metal, film, and foil operations.
Process Overview
The slitting process converts a wide master roll into multiple narrower slit strips through a sequence of: unwind → tension control → knife cutting → rewind. Each stage has parameters that affect output quality.
Setup Sequence
- Mount and align knife pairs to specification width
- Set knife clearance based on material and thickness
- Set knife overlap (penetration depth)
- Set unwind and rewind tensions
- Run test strip at 20% of target speed
- Inspect edge quality — adjust clearance if needed
- Ramp to production speed
Common Defects & Causes
| Defect | Primary Cause | Corrective Action |
|---|---|---|
| Burrs on edge | Clearance too large or dull knives | Reduce clearance, regrind knives |
| Edge curl | Clearance too small or excessive overlap | Increase clearance slightly |
| Material tearing | Speed too high, tension too low | Reduce speed, increase tension |
| Width variation | Knife migration or loose spacers | Check spacer fit, tighten arbor |
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TOA DR Enterprise has supplied precision slitting tools since 1972. ISO 9001:2015 certified.
Request a Quote →Frequently Asked Questions
What causes burrs in slitting?▼
Burrs are caused by incorrect knife clearance (usually too large), dull knives, misaligned knife pairs, or excessive cutting speed for the material. Carbide knives with ±0.002mm tolerance significantly reduce burr formation.
How do I set up knife clearance for a new material?▼
Start at 5% of material thickness for steel, 3% for aluminum, and 0–1% for precision films. Run a short test strip, inspect the edge under magnification, and adjust ±1% until edge quality is acceptable. Record the final setting in your process sheet.
What is the correct knife overlap for metal slitting?▼
For metal slitting, knife overlap (vertical engagement) is typically 0.5–1.5mm. Insufficient overlap causes incomplete cuts; excessive overlap accelerates wear. For stainless steel above 2mm thickness, increase overlap to 2mm.
TOA DR Engineering Team
Precision Slitting Specialists
TOA DR Enterprise Co., Ltd. has manufactured precision slitting knives and spacer rings since 1972. Our engineering team brings decades of hands-on experience in metal slitting, film slitting, and high-precision applications.