How to Print Scannable Barcodes on Corrugated Packaging

Printing barcodes on corrugated packaging introduces challenges that are not present in labelling materials. One of the primary issues is porosity. Corrugated cartons absorb ink quickly, preventing smudging, but the material can cause barcode edges to feather and bleed. This ink spread blurs the lines between bars and spaces, reducing print quality and making the barcodes difficult for scanners to read.

The color of the corrugated material can also influence how well scanners perform. Most cartons have a natural brown tone that reflects less light than other packaging materials. Lower reflectance also helps reduce the contrast between printed barcodes and the background surface. If the contrast between the surface and the barcode diminishes, scanners will struggle to decode the barcode.

Material variability can also have an impact on barcode printing on corrugated boxes. If packaging is made of recycled fibers or materials, it may contain areas with different reflectance abilities across the same panel. When a barcode is printed across these variations, scanners may have difficulty reading the barcode from an inconsistent surface.

Surfaces can also warp slightly during storage and transport. Industrial inkjet barcode printing systems operate at a set distance from the surface to keep barcodes as clear as possible, but variations in warp or surface alignment can affect barcode print quality and the readability of scannable barcodes on cardboard.

The equipment a manufacturer selects for industrial inkjet barcode printing has a direct influence on barcode print quality. Corrugated packaging uses industrial barcode printing systems that apply codes to corrugate cartons without the printhead coming into contact with the surface. Non-contact printing allows marking to be applied to cartons while they move along production lines.

Continuous inkjet (CIJ) technology is widely used for traceability coding on secondary packaging materials. The system throws droplets of ink toward the packaging surface as it passes the printhead, and, because the droplets are small, the printed characters can be compact. This method works well for lot codes and dates.

Thermal inkjet (TIJ) systems are another option that manufacturers use for industrial inkjet barcode printing. These printers eject droplets through a heated resistor inside the cartridge. This technology can produce higher resolution marks than some other coding systems, which support barcode printing on corrugated boxes, where symbol quality directly influences barcode print quality.

Large-character case coding systems are used when larger symbols are required. These printers apply thicker lines of ink droplets and produce wider markings on secondary packaging. This large format supports large-scale scannable barcodes on cardboard that has to remain visible during warehouse packaging.

Another large consideration for barcode printing on corrugated boxes is the production environment. Not all printing solutions are the correct one. Conveyor speed, print height, and marking location can all affect barcode printing quality, and equipment designed for industrial inkjet barcode printing must maintain consistent droplet placement as cartons and cardboard boxes pass through the printing zone.

Ink formulation can impact barcode print quality. Because corrugated materials absorb liquid, the ink has to interact with the substrate in a controlled way. If the ink penetrates too quickly, printed barcodes may appear faint. If there is any reduced opacity that can lower the contrast between the barcode and background surfaces, it can distort the resolution of the barcode. This spreading can influence barcode printing of corrugated boxes and affect how a scanner reads the barcode.

Ink adhesion is also an important factor to consider, especially once packages leave the production line. Corrugated cartons are stacked, transported, and handled multiple times; during these movements, friction can occur between cartons from rubbing. Inks used for industrial inkjet barcode printing must remain legible after handling to keep the barcode print quality legible during distribution.

Drying behavior of the inks is an important consideration. Corrugated packaging moves quickly through production equipment, and printed codes have to dry rapidly to avoid smearing. The ink for scannable barcodes on cardboard needs to be designed to dry quickly after being deposited, and soon after contacting the surface. Proper drying characteristics help maintain barcode print quality as cartons move along conveyors.

Once the equipment and ink choices are made, manufacturers can refine their printing conditions for printing barcodes on corrugated packaging. Symbol design and placement both influence how a scanner will interpret printed coding marks.

A key design feature is the ‘quiet zone’ surrounding a barcode or the blank space around a barcode that allows the scanner to calibrate how reflective the substrate is before it reads the symbol. If the marking contains graphics or if the text appears too close to the code, the scanner may struggle to identify the start and end of the pattern; maintaining proper spacing supports barcode print quality and helps produce scannable barcodes on cardboard.

Contrast between barcodes and the spaces within them also influences decoding performance. Higher contrast allows scanning systems to distinguish the pattern more easily. When companies print barcodes on corrugated packaging, strong contrast helps maintain barcode print quality even when the reflectivity of surfaces varies slightly.

Edge clarity can also contribute to readability. Scanners interpret barcodes by detecting the transition between dark bars and lighter spaces. If those edges appear blurred due to the ink bleeding or spreading (or due to other irregularities), those transitions are harder to read. Clear edges help maintain barcode print quality when printing on corrugated boxes.

Barcode placement on the carton can also influence readability. Symbols that are printed near folds or seams may experience distortion when cartons are handled. Positioning the barcode on a flatter panel can help maintain barcode print quality and support reliable scanning of scannable barcodes on cardboard.

Manufacturers often measure barcode print quality using barcode grading standards. These grading systems help evaluate how well a printed symbol performs when scanned and help determine whether barcode printing on corrugated boxes meets distribution requirements.

Barcode grading standards assess several characteristics of a printed symbol. One measurement examines symbol contrast, which represents the difference in reflectance between the printed bars and unprinted spaces.

Barcode scanners are able to read and decode data by scanning printed symbols under controlled lighting conditions, and the system assigns grades based on established barcode grading standards and reports barcode print quality results. Monitoring these quality checks allows manufacturers to maintain and detect changes in printing performance before unreadable codes can reach distribution channels.

Improve barcode reliability on corrugated packaging. Request a print sample evaluation with KEYENCE today.