Folding heavy cardstock and board presents a challenge that standard folding alone cannot solve. When thick fibres are bent without preparation, the outer surface cracks, exposing the paper core and ruining the professional appearance of brochures, cartons, and presentation folders. Scoring addresses this by creating a controlled indentation along the fold line, allowing the material to bend cleanly without structural damage.
Why Heavy Stock Needs Scoring
Paper and board fold by compressing fibres on the inside of the bend and stretching fibres on the outside. On text-weight paper, this stress distributes evenly. On cover weight and above — typically 8 pt board and heavier — the outer layer cannot stretch fast enough, and the surface breaks along the fold.
Scoring uses a blunt rule or wheel to depress a channel into the substrate along the intended fold line. This channel reduces material thickness at the bend point, giving the outer surface room to flex without cracking. The result is a crisp, clean fold that maintains the integrity of coatings, print, and substrate.
Scoring Methods
Rotary scoring uses a circular blade that presses a groove into the sheet as it passes through the machine. This method suits inline production on folding equipment and handles long runs efficiently. Channel scoring employs a metal rule that crushes a wider depression, effective on very heavy board and coated stocks where a deeper channel is needed.
The choice between scoring methods depends on substrate weight, coating type, and fold orientation relative to paper grain. Scoring parallel to the grain generally produces cleaner results than scoring against the grain, making grain direction an important specification during file preparation.
Applications in Print Finishing
Presentation folders in 12 pt or 14 pt board require scoring at spine and pocket folds. Heavy cover brochures and gatefold mailers benefit from scoring even when the stock is only slightly above standard cover weight. Packaging dielines include score lines at every fold point on carton board.
Scoring and folding are often sequential operations on the same production line. Accurate registration between printed graphics and score lines ensures that folds align with design elements — panels, borders, and text blocks.
Best Practices for Specifying Scores
Mark score lines clearly on dielines and separate them from cut lines using distinct colours or line styles. Indicate fold direction — mountain fold or valley fold — since scoring is applied to the side that becomes the inside of the bend. Allow adequate panel width at fold points to account for board thickness, especially on multi-panel cartons.
Test folds on production stock before committing to a full run. Coated board, recycled stock, and laminated surfaces each behave differently under scoring pressure. At Ceycan Print Services Ltd, we calibrate scoring settings to your specific material and verify fold quality on press proofs before production.
Scoring is a technical step that directly affects how your finished piece looks and feels. On heavy stock, skipping it is not an option — it is the difference between a polished product and one that fails at the first fold.