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How to achieve high transparency and glossiness of OPP film? What are the key technical parameters that need to be controlled?

Technical path to achieve high transparency and glossiness of OPP film
1. Substrate selection and pretreatment
OPP (Oriented Polypropylene) film is a substrate, and its own properties have a decisive influence on the transparency and glossiness of the final product. Anji Aoli New Materials Technology Co., Ltd. selects high-quality polypropylene raw materials to ensure high purity and few impurities, which is the basis for achieving high transparency. In addition, the raw materials must undergo strict pretreatment before processing, including dehumidification, purification and other steps to avoid the adverse effects of moisture and impurities on the transparency of the film.
2. Oriented stretching process optimization
Oriented stretching is a key step to improve the transparency and mechanical properties of OPP film. Anji Aoli uses advanced biaxial stretching technology to precisely control the stretching temperature, stretching ratio and stretching rate to highly orient the polypropylene molecular chains in a specific direction, thereby improving the transparency, gloss, tensile strength and toughness of the film. This process requires extremely high process precision and temperature control capabilities. With its rich experience and advanced production equipment, Anji Aoli can accurately control these parameters to ensure that each batch of OPP film can achieve optimal performance.
3. Surface treatment technology
In order to improve the surface gloss of OPP film and improve its printing and bonding properties, Anji Aoli uses advanced surface coating technology. A very thin layer of transparent resin or special functional additives is evenly coated on the surface of OPP film. By precisely controlling the thickness, uniformity and curing conditions of the coating, the gloss and wear resistance of the film can be effectively improved, while enhancing its bonding strength with the adhesive, providing a good foundation for subsequent processing applications.
4. Selection and ratio of additives
In the formulation design of OPP film, the selection and ratio of additives are also crucial. Anji Aoli has conducted in-depth research on the effects of various additives (such as antioxidants, anti-ultraviolet agents, slip agents, etc.) on the transparency and gloss of the film. Through scientific ratios, it not only ensures the long-term stability of the film, but also avoids the negative impact of additives on transparency. In particular, the addition of anti-ultraviolet additives can effectively resist aging caused by ultraviolet radiation and maintain the high transparency and gloss of the film.
Control of key technical parameters
1. Raw material purity and molecular weight distribution
The purity of the raw materials must be higher than 99%, and the molecular weight distribution should be narrow to ensure the uniformity and transparency of the film.
2. Stretching temperature and stretching ratio
The stretching temperature is usually controlled between the glass transition temperature and melting point of polypropylene. The specific value needs to be flexibly adjusted according to the characteristics of the raw materials and equipment conditions. The stretching ratio is generally controlled between 2:1 and 4:1. Too high or too low stretching ratio will affect the transparency and mechanical properties of the film.
3. Coating materials and curing conditions
The coating material needs to have high transparency, low viscosity, good film-forming properties and good compatibility with OPP film. The curing temperature and time need to be precisely controlled to ensure that the coating is completely cured without affecting the transparency of the film.
4. Type and content of additives
The type and content of additives need to be strictly screened and tested to ensure that they can play the expected function without affecting the transparency and gloss of the film. For example, the addition amount of antioxidants should be controlled between 0.1%-0.5%, and the optimal addition amount of UV inhibitors needs to be determined according to the specific use environment and requirements.