Damage-free slitting! How does a film slitting machine ensure that the edge of the material is smooth and burr-free?

In order to achieve zero damage to film slitting and smooth edges without burrs, it is necessary to carry out precise control from many aspects such as tool system, tension control, material adaptation, and process optimization. The following are the key technologies and solutions:

1. Ultra-precision tool system (core)

1. Tool material and cutting edge treatment

• Material Selection:

• Diamond-coated knives (long life, high hardness, suitable for hard films such as PET/OPP).

• Ceramic knife (no metal contamination, suitable for food-grade films).

• Tungsten carbide knives (cost-effective, suitable for general-purpose slitting).

• Cutting edge treatment:

• Mirror polishing (Ra ≤ 0.05μm) to reduce material melt burrs caused by frictional heat.

• Cutting edge angle: 20°~30° (smaller angle for film, larger angle for thick film).

2. Tool motion control

• Air flotation spindle (no mechanical contact, vibration < 0.1μm).

• Servo motor + grating ruler closed-loop control (slitting repeatability ± 1μm).

2. Intelligent tension control (to avoid tensile deformation)

1. Multi-stage closed-loop tension adjustment

• Magnetic clutch/servo motor, tension fluctuation < 0.5N.

• Ultrasonic sensor monitors film tension uniformity in real time.

3. Slitting process optimization (key parameters)

Fourth, the adaptability of materials is optimized

1. Film pretreatment

• Static Elimination: The ionic air bar eliminates static electricity on the surface of the film and avoids adsorption of debris.

• Constant temperature and humidity environment (23±1°C, 50% RH) to balance the internal stress of the material.

2. Strategies for slitting different materials

5. Online quality monitoring and feedback

• Laser profiler (e.g. Keyence LJ-X) detects edge burrs in real time (threshold setting ≤ 5μm).

• Machine vision system (2μm resolution) automatically flags defects and feeds back to adjust process parameters.

• Dust removal system: negative pressure chip suction + electrostatic precipitator to ensure that the cut surface is clean.

Comparison of actual results (traditional vs. high-precision slitting)

Industry application cases

• Optical film (such as OCA, polarizer): slitting burr ≤ 1μm to meet the requirements of display lamination.

• Food packaging film (such as aluminum-plastic composite film): no pollution slitting, in line with FDA standards.

• Lithium battery separator: zero damage slitting, avoiding the risk of micro-short circuit.

Summary: Critical Control Points

1. Tool superfinishing (mirror edge + high rigidity spindle).

2. Precise tension control (multi-stage closed loop, avoid tensile deformation).

3. Process parameter matching (dynamic optimization of speed/pressure/temperature).

4. Intelligent detection + dust removal (real-time deviation correction to ensure that the cut surface is clean).

Through the combination of the above technologies, it can achieve zero damage slitting in the true sense, and is suitable for high-standard film processing in high-end electronics, medical, new energy and other fields.