Crease Line Designations for CorelDRAW Packaging

Designing packaging dielines in CorelDRAW requires strict technical designations to ensure prepress systems, cutting plotters, and die-makers distinguish fold lines from cut lines. This guide outlines standard line types, spot color naming conventions, stroke properties, and layer management techniques used to properly designate crease lines in professional packaging production.

Purpose of Crease Line Designations

In packaging production, a cutting die uses two primary types of steel rules: sharp cutting blades to separate the substrate and rounded creasing rules to compress the paperboard fibers, allowing clean folds without cracking. Because a vector outline contains both actions on the same artboard, software and hardware RIPs rely on standardized visual and metadata cues to route vector paths to the correct tooling head or die-making operation.

Standard Spot Color Conventions

Crease lines must never be set using process CMYK or RGB values. Instead, they must be assigned dedicated Spot Colors. Die-cutting software, such as Kongsberg, Zünd, or standard CAD/CAM converters, reads spot color names to automate tool assignment.

  • Color Palette Choice: While visual color does not technically matter to a CAM system, packaging industry conventions typically use Cyan, Green, or Red to visually contrast against the Cut line (which is traditionally 100% Magenta).
  • Color Name: In the CorelDRAW Color Palette Editor, set the color type to Spot and name the swatch explicitly based on your converter's requirements. Common recognized names include:
    • Crease
    • Fold
    • Score
  • Overprint Settings: Always right-click the crease strokes and select Overprint Outline. This ensures the dieline does not knock out the underlying artwork when generating production-ready PDFs.

Stroke Styles and Thickness

Visual line styles help press operators quickly identify mechanical actions across large press sheets.

  • Line Style (Pattern): Crease lines are conventionally represented as dashed lines (e.g., standard short dash or dash-dot patterns) within CorelDRAW's Outline Pen settings (F12). In contrast, through-cuts are always solid lines.
  • Line Weight: Set the outline width between 0.1 mm and 0.25 mm (Hairline to 0.5 pt). Thick stroke widths can introduce alignment variances in optical-registration cutting plotters.
  • Line Position: The stroke must be centered on the vector path, with mitered or round corners depending on whether the fold terminates at another rule.

Layer Structure in CorelDRAW

Separating mechanical lines from graphic elements prevents dielines from accidentally printing on the primary press run.

  1. Dedicated Die Layer: Create an independent layer in CorelDRAW’s Object Manager named Dieline or split them into sub-layers named Cut and Crease.
  2. Layer Properties:
    • Lock the layer when working on graphic design elements to prevent accidental shifting.
    • If exporting a production PDF exclusively for printing, toggle the layer's Print/Export attribute off.
    • If exporting for a finishing table, export the dieline layer with artwork hidden or as a technical spot layer.

Special Fold Designations

For packaging requiring hybrid operations, use specialized sub-designations:

  • Perforation (Perf): Indicated by an alternating dash pattern (such as 3mm cut, 3mm space) or assigned a spot color named Perf.
  • Cut-Crease: Common in corrugated board, combining shallow cuts and partial creases. Designated with alternating solid and dashed vectors or a spot color named CutCrease.
  • Reverse Crease: Used for accordion or inverted folds, often styled with a dot-dash stroke or a spot color labeled Crease_Reverse to indicate folding from the opposite side of the sheet.