Think of a die as an industrial cookie cutter shaped like your unfolded box. The board goes in as a printed rectangle and comes out as a flat blank with its outline cut, its folds creased and any windows or hand holes punched out. Folding and gluing turn that blank into a box.
How a steel rule die works
Most packaging dies are steel rule dies. Thin strips of hardened steel are bent to follow the outline of the box and set edge up into a flat base, traditionally a laser-cut board. Three kinds of rule do three jobs:
- Cutting rule has a sharp edge and cuts clean through the board along the outline.
- Creasing rule It pushes a channel into the board so it folds where you want and nowhere else.
- Perforating rule is notched, leaving a line of small cuts for tear strips and tear-off panels.
Rubber strips set beside the blades push the sheet back off the steel after each press. Then the waste is stripped away and the blanks move on to gluing.
Flatbed, rotary and digital cutting
Flatbed die cutting presses a flat die down onto one sheet at a time. It is the usual method for folding cartons and rigid box wraps because it handles thick board and complex shapes well. Rotary die cutting wraps the cutting edges around a cylinder and cuts a continuous web as it spins, which suits long runs of labels and some corrugated work. Digital cutting tables skip the die entirely and follow the outline with a knife, which is how one-off prototypes and samples are often made before a die is built.
Dieline, die and die cut box
These three terms get mixed up. The dieline is the flat drawing of your box with cut, crease and perforation lines marked. The die is the physical tool built from that drawing. A die cut box is any box produced this way, though in catalogs the term often means a box with a distinctive custom shape. The iBox spec sheet lists die cutting, gluing, scoring and perforation as its default processes, with custom window cut-outs available as an option.
What die cutting means for your artwork
A die cuts to a tight tolerance, but print and cut are separate operations and can shift slightly against each other. Two rules protect your design. Extend any background that runs to the edge out to the bleed line, so a small shift never shows a white sliver. And keep text and logos inside the safety margin: the iBox artwork guide asks for important artwork to sit at least 0.125 inches inside the cut line.
iBox products that rely on die cutting
- Die cut boxes: custom-shaped boxes cut to your outline.
- Candle boxes with inserts: cardboard, foam and die cut insert options that hold the candle in position.
- Gift card boxes: small boxes where a precise cut matters because the card fits closely.
- Boxes with foams: protective boxes where die cut windows and handles can be added.
Related terms
- What is a dieline: the drawing a die is built from.
- What is a tooling charge: how suppliers bill for building dies and plates.
- What is a keyline: the outline layer in your artwork file.
FAQ
Is a new die needed for every size?
Yes. A die is made for one outline, so a different size or shape needs its own die. That is why tooling cost matters when you compare quotes.
Can a die cut unusual shapes?
Steel rule can be bent into curves, scallops and cut-outs, so most shapes are possible. Very tight inside corners and thin bridges of board are the practical limits, and they get flagged at the proof stage.
Die cutting on an iBox order
The die and printing plates are free on every iBox order, so a box cut to your own outline carries no extra tooling charge compared with a common shape. The minimum is 100 boxes per design, design support and US shipping are included, and you approve a digital proof showing the cut and crease lines before production. Send your product size and the style you have in mind through the quote form, or browse the die cut boxes buying guide first.
