How to choose a slitter rewinder? 5 key parameters to help you avoid pitfalls!

When choosing a slitter rewinder, you need to consider equipment performance, production needs, and cost-effectiveness. Here are 5 key parameters and guidelines to help you make an informed decision:

1. Material property matching

• Key parameters: material type, thickness, width, tension sensitivity

• Key points for avoiding pits:

◦ Film/paper/metal foil: Different materials need different tension control systems (e.g., film requires high-precision magnetic particle brakes).

◦ Thickness range: Confirm that the device can handle ultra-thin (e.g., 6 μm) or ultra-thick (e.g., 500 μm) materials without tearing or wrinkling.

◦ Electrostatic sensitive materials: Choose a model equipped with a static eliminator.

2. Slitting accuracy and knife type selection

• Key parameters: slitting width tolerance (±0.1mm for high accuracy), tool holder type (flat knife/round knife/air knife)

• Key points for avoiding pits:

◦ High-precision requirements: choose servo drive + CNC system to avoid mechanical errors.

◦ Knife Adaptation:

▪ Flat knife: suitable for paper, hard materials, low cost but easy to wear.

▪ Round knife: high-speed film cutting, long life but regular grinding.

▪ Air knives: Contactless cutting, protecting sensitive materials (e.g. optical films).

3. Tension control system

• Key parameters: tension range (e.g. 5-200N), control mode (open/closed)

• Key points for avoiding pits:

◦ Closed-loop tension control: a high-precision sensor is required, and the fluctuation needs to be <±1% (such as lithium battery separator slitting).

◦ Taper tension function: automatic adjustment when the material with large roll diameter is rewound to prevent the inner layer from being extruded and deformed.

4. Productivity and automation

• Key parameters: maximum speed (e.g. 300m/min), automatic roll change/splicing, online inspection

• Key points for avoiding pits:

◦ High-speed production: It is necessary to match the high-rigidity frame and dynamic balance rollers to avoid vibration affecting the quality.

◦ Automation: automatic unloading and ERP system docking can reduce labor costs (saving 3-5 people/shift).

◦ Inspection system: Defect detection (CCD camera) or thickness monitoring (β rays) reduces scrap rates.

5. Scalability and maintenance costs

• Key parameters: modular design, spare parts replacement cycles, energy consumption

• Key points for avoiding pits:

◦ Quick tool change design: reduce downtime (e.g. change tool position within 1 minute).

◦ Energy consumption comparison: Inverter motors are more than 30% more energy-efficient than traditional motors.

◦ Universality of spare parts: avoid the selection of non-standard customized parts, which leads to difficulties in later maintenance.

Additional pit avoidance recommendations

• Field test: Suppliers are required to test the machine with your materials to observe the burrs on the slitting edge and the uniformity of winding.

• After-sales response: Priority is given to local service outlets or vendors that provide remote diagnosis.

• Safety Certifications: Confirm that the equipment complies with CE/OSHA standards, especially emergency braking and protective cover design.

Summary: According to your material characteristics (such as slitting PET film), capacity requirements (such as 10 tons per day), budget range (such as 50-1 million), balance accuracy and speed, choose equipment with high modularity and perfect after-sales service. Avoid blindly chasing low prices and ignoring long-term costs.