Plywood Calibration Sanding Machine

Plywood Calibration Sanding Machine 

Technical Parameters

• Feeding speed: 5–40 m/min

• Sanding belt size: 1340 × 2800 mm

• Diameter of contact rollers: 400 mm steel roller, 400 mm rubber roller

• Total motor power: 142.5 kW

• Main motor power: 75 kW, 55 kW

• Feeding motor power: 11 kW

• Lifting motor power: 0.75 kW

• Brushing motor power: 0.75 kW

• Voltage requirement: 380 V, 50 Hz, 3 Phase

• Working air pressure: 0.55 MPa

• Compressed air consumption: 0.12 m³/min

• Suction speed: 25–30 m/s

• Volume of suction: 23,000 m³/h

• Overall dimension: 3300 × 3000 × 2450 mm

• Net weight: 11,000 kg

Main Components & Brands

• Sanding roller bearing: NSK

• Bearing with seat: FSB

• Pneumatic components: AirTAC

• Photoelectric switch: OMRON

• Limit switch: CHINT

• Main motor: Huali

• Reducer: DONLY

• PLC: DELTA

• Frequency converter: SHIHLIN

• AC circuit breakers and contactors: CHINT

• Steel roller processing: Shaft head forging, High frequency quenching

• Rubber roller processing: Wear-resistant rubber roller

• Bearing box: Ductile iron

What is Calibration Sanding?

Calibration sanding is the process of using the sanding machine to level the board to precise, uniform thickness.
It is not just about making the surface smooth, but about removing excess material to ensure consistent thickness.

Uniform Thickness: theRaw panels (such as core board, plywood, MDF) often have uneven thickness after hot press. Calibration sanding can bring them to an accurate thickness (e.g. 18.0mm ±0.2mm).

Improved Flatness:Eliminates uneven surfaces, waviness, and knife marks, ensuring both sides are flat. This makes flat surface after lamination or painting.

Difference from Polishing

• Calibration Sanding:
  • Large material removal, focused on thickness control.
  • Requires heavy-duty sanding machines with coarse-grit sanding belts.
  • The goal is precise and uniform thickness, not decorative finishing — creating a solid base for veneering or surface treatment.
• Polishing Sanding:
  • Small material removal, focused on surface smoothness.
  • Minimal sanding, mainly for refining the appearance and touch of the surface.

What Are the Main Functions of Calibration Sanding Machine?

1. Thickness Control:
   Through powerful sanding, the wood panels are processed to the specified thickness with consistent results.
   Typical thickness tolerance is only ±0.1–0.3mm.
2. Improved Surface Flatness:
   Removes uneven areas, knife marks, and pressing dents on the surface, ensuring smoother panels for better processing.
3. Preparation for Subsequent Processes:
   Provides qualified base material for veneering, painting, laminating, and secondary sanding, preventing issues such as bubbling or uneven coating caused by thickness variations.

How to Choose Plywood Calibration Sanding Machine?

1. High-Power Motor Drive
   • Provides stable and strong power, enabling fast material removal even for high-density or thick boards, ensuring processing efficiency.
2. Heavy-Duty Frame & High Rigidity Structure
   • Reduces vibration during sanding, ensuring uniform sanding pressure and avoiding local over-sanding or thickness inconsistency.
   • Reinforced frame minimizes deformation, keeping panels stable during processing and guaranteeing thickness accuracy.
3. Efficient Sanding Belt System
   • Coarse-grit belts quickly remove excess material while protecting the panel surface.
   • Automatic belt tension adjustment ensures consistent and stable material removal.
   • Carefully selected belts and cutter combinations provide uniform sanding, smooth surface, and consistent thickness.
4. Balanced Rollers & Precise Feeding
   • Even roller pressure and adjustable feeding speed ensure uniform thickness across the entire panel.
   • Balanced roller design guarantees consistent contact between the sanding belt and the board, preventing uneven sanding.
5. Precision Feeding System
   • Rollers or conveyor belts feed panels evenly, keeping them stable during sanding and reducing thickness deviation.
6. Automated Thickness Control System
   • Equipped with thickness sensors and PLC control to detect board thickness in real time and adjust sanding amount automatically, achieving continuous, stable, and high-efficiency processing.

 What Are the Common Roller Materials for Calibration Sanding Machines?

Steel Roller

• Material: High-strength alloy steel.
• Use: First sanding head for heavy stock removal and accurate thickness control.

Rubber Roller

• Material: Wear-resistant rubber (60–85° Shore).
• Use: Second sanding head for fine sanding, smooth finish, no indentations.

Composite Roller (Steel Core + Rubber Layer)

• Combines steel rigidity and rubber flexibility for both calibration and finishing.

🔹 Common Configurations

• Steel + Rubber: Most common; front steel roller for removal, rear rubber roller for surface quality.
• Double Steel: For thick boards and heavy removal; rougher finish, needs extra polishing.