Yongte Plastic Machinery: Overcoming the production difficulties of 630mm PVC pipes
In the field of PVC pipe manufacturing, the production of 630mm diameter pipes has always been a difficult "hard bone", but Yongte Plastic Machinery has brought hope to the development of the industry with its excellent technology.
The production of 630mm diameter PVC pipes is full of difficulties. In the extruder link, if the gap between the screw and the barrel exceeds 0.1mm, leakage and reflux will occur, seriously affecting plasticization. If the feed deviation of the mold exceeds ±5% and the compression ratio deviates from the range of 1.8-2.2, the density and plasticization uniformity of the pipe cannot be guaranteed. If the diameter of the mandrel bracket exceeds 10mm and the surface roughness of the mold is greater than Ra0.8μm, the seam line problem will greatly damage the performance of the pipe. During the formulation and mixing, the material dispersion uniformity is less than 95%, and the volatile residue exceeds 1%. Large-diameter pipes produced by extrusion are prone to bubbles and overturning, and there will be problems if the mixing temperature fluctuates by more than ±2℃. In terms of process temperature, the machine body temperature needs to be between 160℃ - 180℃, and the screw temperature needs to be between 170℃ - 190℃.
Improper temperature will cause poor plasticization of the pipe or decomposition of the material. If the pulling speed deviates from the reasonable range of 3% - 8% of the pipe extrusion speed, it will cause problems such as pipe bending and deformation, thickening of the pipe wall, etc. If the plasticization degree is not between 70% - 85%, the product quality is worrying. In the sizing and cooling links, if the vacuum degree is not in the range of - 0.08MPa - - 0.06MPa, the pulling speed deviation is greater than 0.1m/min, the inner hole size tolerance of the sizing sleeve exceeds ±0.2mm, the water temperature is not between 15℃ - 25℃, the water level height fluctuation exceeds 5mm, the water pressure is not between 0.2MPa - 0.4MPa, and the nozzle angle deviation is greater than 2 degrees, it will affect the outer diameter size of the pipe, cooling uniformity and roundness.
Yongte plastic machinery has significant advantages. The screw of its SJSZ92/188 conical twin-screw extruder is made of 38CrMoAlA high-quality alloy steel, with a nitriding layer depth of 0.5mm, a hardness of 900HV, and a chrome plating layer thickness of 20μm. It is wear-resistant and corrosion-resistant, ensuring efficient plasticization and extrusion of materials. The cast aluminum heating ring of the heating system has a power of 25kW, which can heat the material to the set temperature within 10 minutes, with a temperature uniformity of ±1℃, and the cooling fan can accurately control the temperature.
The permanent magnet servo drive motor has a rated power of 37kW and a speed of 1000-3000r/min, which can accurately control the speed. The H13 high-quality mold steel die head of the mold has a flow channel roughness of Ra0.4μm, which can make the molten PVC evenly distributed in the mold cavity, the tube wall thickness uniformity deviation is less than 0.1mm, and the dimensional accuracy is ±0.1mm. The surface roughness of the alloy steel mandrel is Ra0.2μm, which ensures the inner diameter accuracy within ±0.1mm and the inner surface quality. The vacuum calibration tank and water spray tank made of 304 stainless steel are 3mm thick. The vacuum system can maintain a vacuum degree of - 0.08MPa - - 0.06MPa, ensuring the outer diameter accuracy and roundness within ±0.1mm. The 10m³/h water circulation system can stabilize the water temperature at 15℃ - 25℃. The six-claw traction machine has a traction force of 10kN, which is stable for traction of 630mm diameter pipes, and the speed regulation system can achieve synchronous speed regulation of 1:3 - 1:8. The positioning accuracy of the 400mm diameter, 80-tooth saw blade cutting machine is ±0.1mm, and the 500kg load-bearing capacity flip frame can effectively handle the cut pipes.
Yongte Plastic Machinery, with its professional technology and excellent equipment, has demonstrated its strong strength in the face of the difficulties in the production of 630mm diameter PVC pipes, providing the industry with reliable solutions and promoting the PVC pipe manufacturing to a higher quality development.
