What are the effects of different production processes on the properties of BOPP synthetic paper?

Different production processes have significant effects on the properties of BOPP (biaxially stretched polypropylene) synthetic paper. The following is a detailed analysis of the effects of different production processes on the properties of BOPP synthetic paper from many aspects:

First, raw material selection and ratio

1.Polypropylene resin: As the main raw material of BOPP synthetic paper, the molecular weight, molecular weight distribution and processing properties of polypropylene resin directly affect the basic properties of synthetic paper. High molecular weight polypropylene resins generally provide better mechanical strength and toughness.

2.Additive addition: such as the addition of antioxidants, antistatic agents, smoothing agents and other additives, can improve the oxidation resistance of synthetic paper, electrostatic control and processing fluency, thereby improving the overall performance of the product.

Second, extrusion molding process

1.Temperature control: Temperature control during the extrusion process is critical to the quality and thickness uniformity of the sheet. Too high or too low a temperature can lead to a decline in sheet quality, affecting subsequent tensile and finished product performance.

2.Pressure and speed: The control of extrusion pressure and speed also directly affects the forming effect of the sheet, which in turn affects the mechanical and optical properties of the synthetic paper.

Third, two-way drawing process

1.Tensile temperature: The choice of longitudinal and transverse tensile temperature has an important effect on the crystallinity and orientation of the synthetic paper, which in turn affects its mechanical strength and transparency. In general, the tensile temperature should be chosen between the maximum crystallization speed temperature of PP and the melting point.

2.Tensile ratio and tensile speed: The control of the tensile ratio and tensile speed determines the degree of orientation of the molecular chain and the final properties of the film. The higher the tensile ratio, the higher the orientation, the better the mechanical properties of the film, but too high tensile ratio may lead to film rupture. The drawing speed affects the orientation effect and production efficiency.

Fourth, heat treatment process

1.Heat setting temperature and time: the control of heat setting temperature and time during heat treatment is very important to eliminate the internal stress of the film and improve the dimensional stability. Suitable thermal setting conditions can make the film structure more stable and better performance.

Fifth, coating and surface treatment

1.Coating treatment: Coating treatment on the surface of BOPP synthetic paper, such as plasma treatment, can improve its printability and adhesion, and increase the added value of the product.

2.Matte BOPP synthetic paper can be made by adding matte masterbatch or by special treatment on the surface to meet the need for low-gloss products in specific areas.

Sixth, production line speed and equipment conditions

1.Line speed: The line speed has a certain effect on the density of the synthetic paper. The faster the production speed, the lower the density of the resulting product may be, which needs to be reasonably controlled under the premise of ensuring product quality.

2.Equipment conditions: The advanced nature and stability of the equipment directly affect the precise execution of the production process and the consistency of product quality. Advanced production equipment can better control the process parameters, improve product performance and production efficiency.

In summary, different production processes have many effects on the performance of BOPP synthetic paper, including raw material selection and ratio, extrusion molding process, bidirectional drawing process, heat treatment process, coating and surface treatment, as well as production line speed and equipment conditions. In the actual production process, it is necessary to optimize and adjust the process according to the specific product requirements and market demand to ensure that the performance of the synthetic paper reaches the best state.