In the PVC pipe manufacturing industry, the production of 630mm diameter pipes was once a difficult problem, and many technical problems hindered the industry's progress. However, Yongte Plastic Machinery has been exploring tirelessly and successfully breaking through, injecting new vitality into the industry.
There are many difficulties in producing 630mm PVC pipes. In the extruder link, the gap between the screw and the barrel exceeds 0.1mm, which will cause material leakage and reflux, affecting plasticization; the mold feed deviation exceeds ±5% or the compression ratio deviates from 1.8 - 2.2, and the pipe density and plasticization are uneven; the mandrel bracket diameter exceeds 10mm or the mold surface roughness is greater than Ra0.8μm, which will cause seam line problems. In the formulation and mixing process, if the material dispersion uniformity is less than 95%, the volatile residue exceeds 1%, and the mixing temperature fluctuates by more than ±2℃, the pipe is prone to bubbles and overturning. In terms of process temperature, if the body temperature is not between 160℃ - 180℃ and the screw temperature is not between 170℃ - 190℃, poor plasticization or material decomposition will occur. In the traction link, if the deviation between the traction speed and the extrusion speed exceeds 3% - 8%, the pipe will bend, deform, and have uneven wall thickness. The sizing and cooling links also have high requirements. If there are slight differences in parameters such as vacuum degree, traction speed deviation, inner hole size tolerance of the sizing sleeve, water temperature, water level fluctuation, water pressure, and nozzle angle deviation, the outer diameter of the pipe, cooling uniformity, and roundness will be affected.
Yongte Plastic Machinery cleverly solves the problem. Its SJSZ92/188 conical twin-screw extruder performs excellently. The screw is made of 38CrMoAlA high-quality alloy steel, nitrided, with a nitrided layer of 0.5mm, a hardness of 900HV, and a chrome plating of 20μm. It is wear-resistant and corrosion-resistant, ensuring smooth extrusion and plasticization of materials. 25kW cast aluminum heating ring can heat the material to the set temperature within 10 minutes, with a temperature uniformity of ±1℃, and precise temperature control with cooling fan. The permanent magnet servo drive motor has a power of 37kW and a speed of 1000-3000r/min to maintain stable operation of the equipment.
The mold design is unique. The roughness of the H13 high-quality mold steel die head flow channel is Ra0.4μm, which makes the molten PVC evenly distributed, 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, the inner hole accuracy is ±0.1mm, the inner surface quality is good, and the fluid conveying resistance is small.
In the sizing and cooling link, the 304 stainless steel vacuum calibration tank and water spray tank are 3mm thick, corrosion-resistant and stable. The vacuum system stabilizes the vacuum degree at - 0.08MPa - - 0.06MPa, ensuring that the outer diameter accuracy and roundness of the pipeline are within ±0.1mm. The 10m³/h water circulation system keeps the water temperature at 15℃ - 25℃ and cools evenly.
The six-claw tractor has a traction force of 10kN, which can stably pull a 630mm diameter pipe. The speed control system has a 1:3 - 1:8 synchronous speed control and flexible adjustment. The positioning accuracy of the 400mm diameter, 80-tooth saw blade cutting machine is ±0.1mm, and the 500kg load-bearing capacity flip rack properly handles the cut pipes, making the production process smooth and efficient.
This breakthrough of Yongte Plastic Machinery is of great significance to the industry. The product quality has been significantly improved, solving long-term technical problems. The strength, toughness, sealing and dimensional accuracy of 630mm PVC pipes have been improved, making them safer and more reliable for large-scale water supply and drainage projects and municipal infrastructure construction, reducing accident losses. In terms of technological progress in the industry, it has set an example for peers, encouraged more companies to engage in technological research and development, promoted industry development, and enhanced industry competitiveness. In terms of market competitiveness, Yongte Plastic Machinery has emerged in the high-end market. Its 630mm PVC pipes are of excellent quality and strong performance, and are favored by large engineering projects, driving the high-quality development of the industry, enhancing the international competitiveness of domestic products, and expanding the global industrial chain space.
Looking to the future, Yongte Plastic Machinery will adhere to innovation, increase investment in new materials, new processes, and intelligent manufacturing, optimize production technology, improve product quality and production efficiency, reduce costs, and meet diversified market needs. And work closely with upstream and downstream companies to promote the prosperity of the PVC pipe industry chain and help my country's PVC pipe manufacturing industry reach new heights.
