Laser Coding on Flexible Packaging Films

Laser coding on flexible packaging allows manufacturers to apply batch numbers, date codes, serial data and traceability information directly onto pouches, sachets, flow-wraps, lidding films and other web materials.

Film laser marking is not a one-size-fits-all process. Flexible packs may combine multiple polymer, barrier, adhesive, ink and varnish layers, and clear, coloured, metallised or recycled films can respond differently to laser energy. Macsa id assesses the real sample to define the most suitable coding area, technology and process parameters.

Laser Coding for Pouches, Sachets and Wraps

Laser systems can apply fixed or variable information during packaging, including:

• Best-before and use-by dates.
• Batch, lot and shift data.
• References and serial numbers.
• Logos and simple graphics.
• QR, DataMatrix and other 2D codes.
• Production and traceability data for food, pharmaceutical, cosmetic and consumer goods packaging.

When a GS1 data carrier is required, the code size, contrast, location and reading environment must be defined to ensure reliable scanning.

Choosing the Right Laser Technology for Film

The appropriate laser source depends on the film structure, available coding window, required contrast, production speed and packaging performance requirements.

UV Laser Coding for Compatible Flexible Films

UV laser technology can be particularly suitable for compatible flexible films and UV-responsive coding areas. It is well suited to short, variable codes that require clear contrast with limited thermal impact on the surface.

In the right application, UV coding can be an alternative to thermal transfer overprinting for dates, batches and other variable information. Explore iLumiFlex UV laser coding for flexible packaging.

Fibre Laser Coding for Selected Laminates and Metallised Films

Fibre laser technology can be evaluated for selected metallised films and laminated structures where the surface layer provides the required contrast and appearance.

The result depends on the outer layer, printing, coating and required code. A sample test is essential to confirm code quality and ensure the packaging remains suitable for its intended use.

CO₂ Laser Coding for Compatible Film Structures

CO₂ lasers can be appropriate for certain flexible film structures, printed surfaces and designated coding areas. Their suitability depends on how the material or coating absorbs laser energy.

Rather than choosing a laser source by film category alone, Macsa id evaluates the complete packaging construction and the required result.

Validate Code Quality and Package Integrity

The film formulation is only one part of the application. The result can also be influenced by colour, print design, coatings, varnishes, barrier layers, thickness, sealing area and production conditions.

Before defining a solution, we validate:

• Contrast and readability of the code.
• Code size and placement on the packaging.
• Production speed and repeatability.
• Visual appearance of the pack.
• Packaging, barrier and sealing requirements relevant to the application.

This is especially important for recyclable and mono-material packaging, where the formulation and coating can vary between suppliers. Learn more about laser coding on recyclable mono-material packaging.

Integration Into Packaging Lines

Laser coding systems can be configured for vertical and horizontal form-fill-seal machines, flow-wrappers and other continuous packaging processes.

The final integration is adapted to the available space, web movement, code position, production speed, data interfaces and, where required, code verification systems.