What determines the gloss of BOPP color synthetic paper?

The gloss of BOPP color synthetic paper is determined by a number of factors, mainly including the following aspects:

1. Characteristics of raw materials

Polypropylene resin: As the main component of BOPP color synthetic paper, the characteristics of polypropylene resin itself will affect the gloss of the final product. Different grades of polypropylene resin may have differences in gloss performance.

2. Production process

Bidirectional drawing process: In the bidirectional drawing process, the polypropylene molecular chains are oriented in the direction of the drawing, forming a highly ordered microstructure that helps the specular reflection of light, thereby improving the gloss.

Coating treatment: Some BOPP color synthetic paper will be coated during the production process, and the type, thickness and uniformity of the coating material will affect the gloss of the product. The coating can fill in small bumps on the surface of the substrate, making the surface smoother and thus improving the gloss.

Calender treatment: Calender treatment is also one of the important means to improve the gloss of BOPP color synthetic paper. Through the extrusion of the calender roller, the surface of the film can be more dense and smooth, reduce the scattering of light, and improve the gloss.

3. Additives and fillers

Functional fillers: The use of additives such as antioxidants, lubricants, fluorescent whitening agents will also have an impact on the gloss of BOPP color synthetic paper. These additives can improve the processing performance, stability and color effect of the film, and indirectly improve the gloss.

Pigments and dyes: The type, concentration, and dispersion of pigments and dyes used for coloring also affect the gloss of the product. Highly dispersed pigments and dyes help to form a uniform and smooth ink film and improve gloss.

4. Surface treatment

Corona treatment: Corona treatment can change the polarity of the surface of the BOPP color synthetic paper, improve its adhesion to the ink and adhesive, and also help to improve the gloss. Because the surface polarity is enhanced, the reflection of light on the surface is more regular, reducing the scattering phenomenon.

5. Environmental factors

Humidity and temperature: Although BOPP color synthetic paper has undergone strict quality control during the production process, changes in ambient humidity and temperature may still have a certain impact on gloss during storage and use. High humidity may lead to hygroscopic deformation of the film and affect the gloss. Excessive temperature may accelerate material aging and reduce gloss.

In summary, the gloss of BOPP color synthetic paper is determined by many aspects such as raw material characteristics, production process, additives and fillers, surface treatment and environmental factors. In actual production, it is necessary to select the appropriate raw materials, process parameters and additive types according to the specific needs to obtain the ideal gloss effect.