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How to Bend Cardboard into a Box

Published in Cardboard Bending 3 mins read

Bending cardboard into a box involves creating clean, precise folds along designated lines. One effective way to achieve these folds is by compressing the cardboard along the line where the bend is needed.

The Core Technique: Compressing the Cardboard

To bend cardboard for a box, you first need to mark or score the lines where the bends will occur. Once these lines are established, the bending process itself can be done effectively by:

  • Compressing the Cardboard: As noted in the reference, you can create a bend by compressing the cardboard along a defined line. This process weakens the cardboard fibers along that specific path, making it easier to fold neatly.

This compression is typically achieved using a scoring tool, the back of a utility knife, a bone folder, or even a ruler and pen/stylus. The tool is pressed firmly against the cardboard along the line, creating a crease without cutting through the material.

Why Compression Works

Compressing the cardboard along the fold line serves several purposes:

  • Weakens the Fibers: It crushes the corrugated layer and/or the paperboard layers, reducing resistance to bending.
  • Creates a Hinge: The compressed line acts as a natural hinge for the cardboard to pivot along.
  • Ensures a Clean Fold: This method results in a sharp, straight fold rather than a rounded or jagged bend that can weaken the box structure.

Bending for Box Construction

Creating a box requires multiple bends. After scoring all the necessary lines (which typically define the bottom, sides, and flaps of the box), you simply fold the cardboard along each compressed line. The rigidity of the uncompressed cardboard sections holds the structure, while the compressed lines allow for easy and accurate folding.

This process of scoring (compressing) and folding allows flat sheets of cardboard to be transformed into three-dimensional box shapes, ready for assembly (usually with tape or glue).

In summary, while the full process of making a box involves design, cutting, scoring, and assembly, the fundamental act of bending the cardboard is effectively performed by compressing the material along the desired fold lines, turning stiff board into foldable sections.

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