Label films are integral to the labeling industry, providing a durable and versatile medium for printing and adhering information. This article delves into the essential structure of label films, shedding light on their components and functionality.
1. Structure Overview
Label films typically consist of three main layers: the face material, the adhesive, and the backing paper (or protective paper).
2. Face Material
The face material serves as the printing surface and is categorized based on material type (film or paper), transparency, flexibility, temperature resistance, and special properties (self-destructing, self-repairing). Common face materials include PET, BOPP, PVC, PP, PE, and various papers like copperplate paper and kraft paper.
3. Adhesive Layer
The adhesive layer is crucial for attaching the label to the desired surface. It can be formulated to provide different levels of adhesion, temperature resistance, and removability. High-quality label films often use removable traceless adhesives, which can be adjusted through patented technology to meet specific needs.
4. Backing Paper
The backing paper protects the adhesive layer from contamination and facilitates easy peeling before use. It is available in various materials such as PET, PP/PE, CPP, and格拉辛 paper. The thickness of paper materials is measured in grams per square meter, while film materials are measured in micrometers (μm) or millimeters (mm).
5. Printing and Coating
The face material may include a coating or corona discharge treatment to enhance ink adhesion. Different inks (water-based, weak solvent, UV) correspond to different coatings, with UV ink often providing the best corona discharge effect.
6. Application Considerations
When selecting a label film, consider factors such as the surface material where the label will be applied, the environmental conditions (temperature, humidity), and the required durability and removability of the label.
7. Conclusion
Understanding the structure of label films is essential for ensuring that they meet the specific needs of your labeling application. From the choice of face material to the formulation of the adhesive layer, each component plays a vital role in the performance and durability of the label.
