Cardboard Box Manufacturing Process: From Paper to Finished Box

Understanding the cardboard box manufacturing process helps buyers make better equipment and material decisions. This guide explains each production stage.

Overview of Manufacturing Stages:

Stage 1: Paper preparation

Stage 2: Corrugating (board making)

Stage 3: Converting (box making)

Stage 4: Finishing and shipping

Stage 1: Paper Preparation

Raw Materials:

• Kraft linerboard: Brown outer layers (125-440 gsm)

• Test linerboard: Recycled outer layers (cheaper)

• Corrugating medium: Forms the flutes (90-200 gsm)

• Adhesive: Starch-based glue bonds layers

Paper Storage:

• Climate-controlled warehouse

• Proper humidity (50-65% RH)

• Acclimation before use (24-48 hours)

Stage 2: Corrugating Process

The corrugating line converts paper rolls to board sheets:

Step 2.1: Single Facer

• Paper feeds from roll stand

• Preheater conditions paper

• Corrugating rolls form flutes

• Adhesive applied to flute tips

• Liner bonds to one side

• Output: Single-face web

Step 2.2: Bridge/Incline

• Single-face travels up conveyor

• Provides buffer storage

• Web stabilizes (moisture equilibrium)

Step 2.3: Glue Machine

• Adhesive applied to exposed flute tips

• Precise metering for bond quality

Step 2.4: Double Backer

• Second liner fed from roll stand

• Hot plates cure adhesive

• Creates finished corrugated board

Step 2.5: Slitter Scorer

• Cuts board to required widths

• Creates fold lines (scores)

Step 2.6: Cut-Off

• Cuts board to sheet length

• Synchronized with orders

Step 2.7: Stacker

• Collects and stacks sheets

• Counts and bundles

Stage 3: Converting Process

Converting turns board sheets into boxes:

Option A: Flexo Folder Gluer (FFG)

All-in-one production:

• Prints graphics (1-4 colors)

• Cuts slots for flaps

• Scores fold lines

• Folds box shape

• Glues manufacturer's joint

• Output: Flat, folded boxes

Option B: Separate Operations

Printer Slotter → Folder Gluer or Stitcher

Option C: Die Cutting

For complex shapes: Die Cutter → Folder Gluer

Stage 4: Finishing

• Quality inspection

• Bundling and strapping

• Palletizing

• Stretch wrapping

• Shipping to customer

Boiler-Free Manufacturing:

Xuegong's technology changes Stage 2:

• No steam boiler needed

• Room temperature operation

• Instant-setting adhesive

• Same speed, 60% less energy

Contact Xuegong for manufacturing equipment and adhesive solutions.