Corrugated Box Packaging Machinery: Detailed Structure and Functions

Corrugated box packaging machinery is a sophisticated automated system designed to efficiently convert flat corrugated sheets into various types of cartons. The key components include the feeding system, printing unit, die-cutting section, folding and gluing mechanism, and stacking/delivery system. Below is a detailed breakdown of each part and its function.

Feeding System

Function: Separates and feeds individual corrugated sheets into the production line with precision.

• Sheet Stacking Table: Holds 1000-3000 sheets, often with automatic reloading.

• Sheet Separation Mechanism:

  • Vacuum Suction: Uses negative pressure to pick single sheets, preventing double feeding.

  • Friction Rollers: Rubber rollers separate thinner sheets via friction.

• Alignment System: Photoelectric sensors ensure accurate positioning (±0.5mm tolerance).

• Conveyor Belt: Transports sheets to the next stage with servo-controlled speed adjustment.

Printing Unit

Function: Prints logos, text, barcodes, and graphics for branding and traceability.

• Printing Methods:

  • Flexographic Printing: Uses resin plates for simple designs (low cost).

  • Offset Printing: Higher precision, suitable for color printing.

  • Digital Inkjet Printing: No plates required, supports variable data (QR codes, dates).

• Anilox Roller: Controls ink volume for consistent print quality.

Die-Cutting Unit

Function: Cuts and creases the corrugated board to form foldable box shapes.

• IR (Infrared) Drying: Quickly cures water-based ink.

• UV Curing: Instant drying for UV inks.

• Die-Cutting Methods:

  • Flatbed Die-Cutting: High precision, ideal for small/medium boxes.

  • Rotary Die-Cutting: High-speed, suitable for mass production.

• Die Board:

  • Steel Blades: Cut the board outline.

  • Creasing Rules: Create fold lines.

Folding & Gluing Unit

Function: Folds the die-cut board into a 3D carton and secures it with adhesive or stitching.

Stacking & Delivery System

Function: Collects finished boxes into neat stacks for palletizing.
Key Components & Mechanisms:

• Suction System: Removes scrap material automatically.

• Brush Cleaners: Clear fine debris.

• Folding Methods:

  • Mechanical Folding Arms: Cam or servo-driven for precision.

  • Vacuum-Assisted Folding: Prevents misalignment.

• Bonding Methods:

  • Hot Melt Glue: Fast curing (3-5 sec), ideal for high-speed lines.

  • PVA (Water-Based) Glue: Eco-friendly but slower drying.

  • Stitching: Metal staples for heavy-duty boxes.

• Compression Unit: Ensures strong adhesion.

• Counting & Stacking: Groups boxes by preset quantities (e.g., 50/stack).

• Orientation Adjustment: Rotates stacks for optimal pallet loading.

• Optional Strapping/Wrapping: Secures stacks for transport.