Scored Line: Corrugated Board Creasing for Clean Folds

What Is a Scored Line?

A scored line is a linear crease pressed into corrugated board to create a predetermined fold point. Scoring partially crushes the board along a straight line, weakening it just enough to fold cleanly and consistently without cracking, splitting, or tearing the outer liner. Every corrugated box — from a basic RSC to a complex die-cut design — relies on scored lines to define where the flat blank folds into a three-dimensional container.

Scoring is performed during the converting process by a scoring wheel or scoring rule that presses a rounded indentation into the board. The depth and width of the score are calibrated to the board’s flute profile and caliper to achieve a clean fold without compromising structural integrity.

Why Scoring Quality Matters

The quality of a scored line directly affects box performance. A properly executed score creates a fold that is sharp, straight, and repeatable across every unit in a production run. Poor scoring — too shallow, too deep, or misaligned — leads to cracked liners, uneven folds, and boxes that do not erect squarely. These defects cause problems on automated case-erecting lines, reduce stacking strength, and create a poor impression for branded retail packaging.

In die-cut boxes, scoring rules are built into the steel-rule die alongside cutting rules. The die line drawing distinguishes between cut lines and score lines so that the die maker installs the correct rule type in each position.

Types of Score Lines

The most common score types in corrugated packaging are:

• Standard score: A single crease used for most box folds, including panel folds and flap folds on RSC and HSC containers.
• Double score: Two parallel creases spaced slightly apart, creating a wider fold zone. Double scores are used where panels must fold to 90 degrees or beyond without cracking, especially on heavier board grades.
• Reverse score: A crease applied from the opposite side of the board, used when a panel must fold in the opposite direction from the standard orientation.

Scoring at President Container Group

President Container uses precision-calibrated scoring equipment across our converting and die-cutting operations. Whether we are producing standard box blanks on our slotter-scorer lines or complex die-cut pieces, every score line is engineered for the specific board grade and fold angle required. This attention to detail ensures clean erection, consistent dimensions, and reliable performance on your packing line.