A corrugated board automatic line is a fully integrated, automated production system designed to manufacture corrugated cardboard (also called corrugated fiberboard) in a continuous, high-speed process. This type of production line is widely used in the packaging industry to produce the material for boxes, displays, protective packaging, and other corrugated products. The line combines multiple stages—from raw paper processing to finished board—into a seamless workflow, minimizing human intervention and maximizing efficiency.

Key Components of a Corrugated Board Automatic Line

1.Unwinders (Reel Stands)

Holds large rolls of kraft paper (linerboard and medium).

Automatically feeds paper into the line while maintaining tension and alignment.

2.Preheaters

Heats the paper using steam or electric systems to make it pliable for corrugating.

3.Single-Facer (Corrugating Unit)

Creates the fluted medium (corrugated layer) by pressing the paper between heated, grooved rollers.

Applies starch-based adhesive to bond one linerboard to the fluted medium, forming a single-face corrugated sheet.

4.Bridge (Accumulator)

Temporarily stores single-face corrugated sheets to ensure continuous flow during downstream process adjustments.

5.Double Backer (Double-Facer)

Bonds a second linerboard to the single-face sheet to create double-wall or triple-wall corrugated board (depending on configuration).

Uses heat, pressure, and adhesive to finalize the board structure.

6.Slitter-Scorer

Cuts the corrugated board to the desired width.

Adds creases (scores) for folding into boxes.

7.Cut-Off Machine

Trims the board into specific lengths using rotary or shear cutters.

8.Stacker

Automatically stacks finished boards for palletizing and shipping.

9.Auxiliary Systems

Adhesive Preparation: Mixes and distributes starch-based glue.

Steam Generator: Provides heat for corrugating rollers and preheaters.

Quality Control Sensors: Monitors thickness, adhesive application, and defects.

Automation & Technology

PLC (Programmable Logic Controller): Central computer controls all machinery, adjusting speed, temperature, and alignment in real time.

IoT Integration: Modern lines use sensors and data analytics to optimize production, predict maintenance, and reduce waste.

Quick-Change Systems: Automated adjustments for different flute profiles (A, B, C, E, etc.) or board thicknesses.

Types of Corrugated Boards Produced

1.Single-Wall: One fluted layer between two linerboards (most common).

2.Double-Wall: Two fluted layers with three linerboards (for heavy-duty packaging).

3.Triple-Wall: Three fluted layers for extra strength (e.g., industrial crates).

Benefits of an Automatic Line

High Speed: Produces up to 400 meters/minute (depending on flute type and machinery).

Consistency: Uniform quality with minimal defects.

Cost-Effective: Reduces labor and material waste.

Scalability: Easily adapts to varying order sizes and specifications.

Applications

Shipping boxes, retail packaging, protective inserts, displays, and custom-designed corrugated products.

Conclusion

A corrugated board automatic line is a sophisticated, end-to-end system that transforms raw paper into durable, lightweight packaging material. By integrating advanced automation, it ensures high productivity, precision, and adaptability to meet diverse industry demands.