Note: Differences in sealing film materials and front and back sides

As a widely used packaging material, the difference in the material and front and back sides of sealing film is of great significance for ensuring packaging effects and improving product quality. This article will introduce in detail the material of sealing film and the difference between the front and back sides.

1. Types and characteristics of sealing film materials

There are many types of sealing film materials, including PE, PET, PP, PVC, PS and aluminum foil. These materials have their own characteristics and are suitable for different packaging needs.

1. PE (polyethylene) sealing film: has good flexibility and transparency, relatively low price, widely used in packaging in food, medicine and other industries.

2. PET (polyester) sealing film: has high strength and wear resistance, suitable for packaging occasions requiring high strength and durability.

3. PP (polypropylene) sealing film: has excellent heat resistance and moisture resistance, suitable for packaging in high temperature environments.

4. PVC (polyvinyl chloride) sealing film: has good weather resistance and chemical stability, suitable for packaging that requires long-term storage or special environments.

5. PS (polystyrene) sealing film: has high gloss and aesthetics, suitable for high-end products or gift packaging.

6. Aluminum foil sealing film: has excellent barrier properties and aesthetics, suitable for packaging that requires high barrier properties or special aesthetics.

2. The difference between the front and back of the sealing film

The front and back of the sealing film are different in material, appearance and performance. Correctly distinguishing and using them reasonably is crucial to improving the packaging effect.

1. Appearance difference: The front and back of the sealing film usually have obvious differences in appearance. The front side is generally glossy, with a smooth and sleek surface, while the back side is relatively dull, and the surface may show a certain texture or roughness. This difference in appearance helps users quickly distinguish the front and back sides when using it.

2. Performance difference: The front and back of the sealing film also have different performances. The front side usually has good printing performance and wear resistance, and is suitable for printing logos, patterns, etc., to improve the beauty and recognition of the packaging. The back side mainly focuses on its sealing performance, which needs to be able to fit the packaging tightly to prevent the intrusion of external air, moisture, etc., to ensure the safety and stability of the packaging.

3. Usage: When using the sealing film, it is necessary to reasonably select the front and back sides according to the packaging requirements. For packaging that needs to print logos or patterns, the front side should be selected as the printing side; for packaging that needs to improve sealing performance, the back side should be selected as the fitting side.