What factors will affect the quality of BOPP synthetic label paper?

There are many factors that affect the quality of BOPP (biaxially oriented polypropylene) synthetic label paper, and the following are some of the main factors:

1、 Raw material quality

Quality of polypropylene resin: As the main raw material for BOPP synthetic label paper, the quality of polypropylene resin directly affects the performance of the final product. The molecular weight distribution, purity, crystallinity, and other characteristics of resin will affect the strength, transparency, and glossiness of label paper.

The use of additives: In the production process, specific additives are added to improve certain properties of label paper, such as antistatic, slip resistant, and anti adhesive properties. The types and amounts of these additives will have an impact on the quality of label paper.

2、 Production process

Stretching process: BOPP film needs to undergo longitudinal and transverse stretching during the production process to improve its mechanical and optical properties. The control of stretching temperature and stretching ratio is crucial for the performance of the final product. Insufficient stretching can lead to insufficient film strength, while excessive stretching may cause the film to become brittle.

Cooling process: The cooling rate and temperature have a significant impact on the crystallinity and optical properties of the film. Excessive cooling may lead to increased internal stress in the film, affecting transparency and glossiness; Slow cooling may lead to excessive crystallinity, reducing the toughness and transparency of the film.

Surface treatment process: In order to improve the adhesion and composite strength of ink, BOPP film usually needs to undergo corona treatment. The degree of processing directly affects the surface wetting tension and printing suitability of the film.

3、 Storage conditions

Temperature and humidity: During storage, changes in temperature and humidity may cause changes in the performance of BOPP synthetic label paper. High temperature and high humidity environments may cause the film to absorb moisture and deform, affecting its effectiveness.

Lighting conditions: Prolonged exposure to light may cause the film to age, reducing its mechanical and optical properties.

4、 Usage environment

Chemical environment: In certain chemical environments, BOPP synthetic label paper may be corroded or dissolved, leading to a decrease in its performance.

Physical environment: Physical effects such as friction and scratching may cause surface wear on label paper, affecting its aesthetics and service life.

5、 Printing and processing process

The selection of printing ink: The type, viscosity, and drying speed of ink can all affect the printing effect and the final quality of label paper.

Processing methods such as cutting, die-cutting, and laminating may all have an impact on the quality of label paper. Especially in the laminating process, the control of laminating temperature, pressure, and speed is crucial for the laminating effect.

In summary, to ensure the stable quality of BOPP synthetic label paper, it is necessary to start from multiple aspects such as raw material selection, production process control, storage condition management, environmental adaptation, and optimization of printing and processing processes.