How To Make PVC Panel/PVC Panel Production Process

The processing of PVC panels is divided into six parts: raw materials, formula, mixing process, extrusion process, mold, and operator technology. The above six parts are inseparable. If any of these parts are missed, high-quality PVC panels cannot be produced.. If the operator don’t understand the PVC technology, a good product will still be bad. On the contrary, if the technology is good, even a not-so-good formula can be made perfect. 

The Importance of Each Part in PVC Sheets Processing

These six parts are equally important. In the processing of PVC sheets, the formula accounts for 30~40%, the structure and extrusion process of the extruder account for 25%, the mixing process accounts for 20%, and the operator’s technology and functions also account for 10~15%.

The Extrusion Process and Its Relation to Plasticization Degree

Here we briefly describe the extrusion process used in PVC production. Lowering the temperature of the confluence core increases the plasticization degree, while raising the temperature of the confluence core reduces the plasticization degree. Our PVC polymer material has a characteristic that the higher the temperature, the faster the fluidity, but it is not unlimited. A square tube has four zones for heating. If the left side flows slowly and the material is less, heating this side will increase the fluidity immediately. Therefore, the more it is heated, the faster the fluidity and extrusion of the object. Why is the fluidity of the heated object faster? Because there is no resistance and it is extruded smoothly. In fact, we can regard the confluence core as a valve. When our water valve is fully opened, the water flows down smoothly. When the valve is half open or completely closed, the water does not flow or flows very little. We regard the confluence core as a valve for water. When the temperature is low, it is equivalent to closing the valve for a while. This is the reason. By adjusting the temperature of the confluence core to increase a certain degree of plasticization, but it is not complete. Using it to increase the plasticization degree is very small. Poor plasticization does not mean no plasticization, but it means there are certain defects. So when there is poor plasticization, we can lower the temperature of the confluence core. After lowering it, the plasticization will be good, the flow of the material will be slow, and a pressure will be generated. The result of the pressure is the increase of the plasticization degree. The performance of PVC products is closely related to the plasticization degree. If the plasticization degree is poor, the product will be brittle and the mechanical properties will not meet the requirements; if the plasticization degree is too high, the product will have yellow lines and the mechanical properties will not meet the requirements. The plasticization degree is very important in the processing of PVC products. When the plasticization degree is 60%, the tensile strength is the highest; when the plasticization degree is 65%, the impact strength is the highest; when the plasticization degree is 70%, the elongation at break is the highest:

The influence of temperature on plasticization degree:

Polymer materials cannot be melted at temperatures below 80℃ and are in a glassy state. Materials in a glassy state are hard and brittle and cannot be processed in a glassy state. As the temperature rises to 160℃, the material is in a highly elastic state, but the material still cannot flow in this area, and can only be softened and its viscoelasticity increased. The temperature should be between 160-200℃ to achieve PVC melt processing and fluidity. However, for any stabilizer, when the temperature is higher than 200℃, the material will decompose after long-term heating. Therefore, when controlling the plasticization degree, the temperature can only be controlled between 160-200℃. Within this 40℃ temperature difference range, PVC has better plasticization when the temperature is set between 170-180℃.