How does the PVC-WPC wall decoration board extrusion production line ensure product quality? ​

In the field of building decoration materials, PVC-WPC wall decoration boards are favored for their unique advantages. As the key equipment for producing the board, the PVC-WPC wall decoration board extrusion production line is crucial to ensure product quality. ​

From the production process point of view, the precise ratio of raw materials is the cornerstone of product quality. The raw materials of PVC-WPC wall decoration boards mainly include PVC resin and low-biomass fibers such as sawdust, wood chips, and bamboo chips. The production line must strictly follow the established formula and accurately deliver various raw materials to the mixing link through high-precision metering equipment. For example, during the mixing process, a high-speed mixer is used to heat the material to a specific process temperature under the action of mechanical self-friction, so that the raw materials are fully blended and the components are evenly distributed, laying a good foundation for subsequent molding. If the raw material ratio is improper, it may lead to board performance defects, such as insufficient strength and poor toughness. ​

The process control of the extrusion link directly determines the product quality. Taking the conical twin-screw extruder as an example, the design of its screw and barrel is unique. During the rotation of the screw, the larger diameter of the feeding section can provide a larger heat transfer area and a higher shear speed, which is conducive to the rapid plasticization of the material; while the smaller diameter of the screw in the metering section reduces the heat transfer area and the shear speed of the melt, which can enable the melt to be extruded at a lower temperature, effectively avoiding overheating and decomposition of the material, and ensuring stable product quality. At the same time, the temperature control of the extruder is also extremely critical. The temperature of each heating area needs to be accurately controlled to ensure that the material is plasticized and extruded within the appropriate temperature range. If the temperature is too high or too low, it will affect the molding quality of the sheet, resulting in problems such as rough surface and uneven internal structure. ​

The key components of the equipment play a decisive role in product quality assurance. As a key component of sheet forming, the internal flow channel design of the T-type die must be scientific and reasonable. The dimensional accuracy, surface finish and flow uniformity of the flow channel are directly reflected in the thickness uniformity and surface flatness of the sheet. A high-quality T-type die can extrude the melt evenly to form a sheet with consistent thickness and smooth surface. If there are defects in the die head, the sheet is prone to quality problems such as large thickness deviation and surface ripples. ​

Cooling and shaping equipment is also indispensable. After the sheet is extruded, it needs to be quickly cooled and shaped by equipment such as cooling racks and vacuum shaping water tanks. Factors such as cooling speed and uniform distribution of cooling medium during the cooling process will affect the crystallinity and internal stress distribution of the sheet. For example, the uniformity of water flow in the vacuum shaping water tank with circulating water spray cooling and stable control of vacuum degree have a significant impact on the dimensional accuracy and surface quality of the sheet. If the cooling is uneven, the sheet may warp and deform, seriously affecting the performance of the product. ​

Quality control links run through the production line. At the raw material input stage, each batch of raw materials is strictly tested to ensure that its various performance indicators meet the requirements. During the production process, the thickness, width, surface quality and other parameters of the sheet are monitored in real time through online monitoring equipment. Once abnormal parameters are found, the production process parameters are adjusted immediately or the equipment is maintained and repaired. For example, a high-precision thickness gauge is used to monitor the thickness of the sheet in real time. When the thickness deviates, the system can automatically feedback and adjust the extrusion speed of the extruder or the opening of the die head. After the product is off the line, random inspections will be carried out to comprehensively evaluate the product quality through physical performance tests, chemical performance analysis, etc. Only products that meet quality standards can enter the market. ​

The PVC-WPC wall decoration board extrusion production line guarantees product quality in all aspects through fine control of the production process, optimized design of key equipment components, and a strict quality control system, thereby providing the market with high-quality PVC-WPC wall decoration boards.