4 important parameters of lidding film

what is a lidding film?

A lidding film is a thin flexible film used as the top closure or seal for a container (such as a tray, cup, jar, bottle, or blister pack). It forms the lid or cover that protects the packaged product, often by sealing to the container rim or flange.

Key features of lidding film:

Usually made from plastics (e.g., PET, PP, PE, oriented films), aluminum foil, paper laminates, or multilayer composites that combine barrier, strength, and sealability.

Provides a barrier against moisture, oxygen, odors, light, contamination, and tampering; preserves freshness and shelf life.

Typically heat-sealed, pressure-sealed, or adhesive-laminated to the container.

Pre-cut peelable lids, rollstock for form-fill-seal (FFS) lines, or continuous webs for thermoforming/blister packing.

What are the four important parameters of lidding film?

The four main parameters of lidding film generally refer to: material structure/thickness, photoelectric eye, film width, and film running direction. So why are these four parameters important for sealing film? What is their specific significance?

Material Structure/Thickness

Material structure/thickness is the sole parameter for calculating the unit price of lidding film products, and the significance of this technical parameter is self-evident and the most important.

Photoelectric Eye

The photoelectric eye is a “mark” printed in the corner of the lidding film‘s printing layer. This parameter is an important basis for identifying the “film cutting point” on the machine. When the machine’s tracking component detects this point, the machine will prompt the sealing machine to complete the forming/filling/sealing process.

Film Width

Film width refers to the vertical width of a roll of lidding film, which must be consistent with the vertical width of the sealing machine.

Film Running Direction

The running direction is a parameter that indicates the correct forward direction of the lidding film when it runs on the sealing machine.

Importance of these four important parameters of lidding film

Material structure/thickness: This parameter is provided by the customer, and the lidding film manufacturer can calculate the product’s unit price based on this parameter.

Photoelectric eye, film width, and film running direction: These three parameters are provided by the customer’s sealing machine supplier. After obtaining these three parameters, the lidding film manufacturer arranges printing and typesetting, and then produces the printing cylinder.