In the plastic extrusion industry, PVC material has a wide range of application scenarios, but there are many difficulties in the processing process. From pipes and profiles to sheets, cable sheaths, decorative materials, PVC products penetrate multiple downstream fields.
Common pain points in PVC extrusion production
1. Extrusion pressure fluctuation
In the traditional production mode, the extruder needs to simultaneously complete multiple tasks such as plasticization, mixing, conveying, and pressurization.
Due to factors such as changes in raw material status, screw wear, and back pressure fluctuations, the stability of melt output is easily disturbed, which is manifested as fluctuations in the size of the finished product.
2. Insufficient stability of melt flow rate
For PVC profile and pipe production lines, stable flow output is crucial. Changes in flow rate can cause variations in pipe diameter and wall thickness, resulting in a decrease in overall consistency of the finished product.
3. Material degradation risk
If the molten material stays inside the equipment for a long time or the local shear effect is too strong, the PVC material is prone to yellowing and decomposition, and the overall performance of the product decreases accordingly.
How can PVC melt gear pump improve the above production problems?
The PVC melt gear pump relies on precision gear meshing to complete material conveying, and relies on the principle of volumetric conveying to achieve effective control of the melt state. Its main value lies in the following aspects:
1. Stabilize melt pressure and improve dimensional fluctuations in finished products
The melt gear pump can provide isolation and buffering between the extruder and the die.
The extruder is responsible for plasticizing and mixing materials, while the melt pump is responsible for conveying and pressurizing the melt.
It can weaken the impact of screw pressure fluctuations, feeding state changes, and mold head pressure changes, making the PVC melt entering the mold head more stable.
Applied on PVC pipe, profile, and sheet production lines, it helps to improve the consistency of finished product dimensions.
2. Regulating melt flow rate to optimize product quality
The melt gear pump belongs to the volumetric metering equipment, and there is a good correspondence between the output flow rate and the pump speed.
By adjusting the pump body speed, stable feeding state, adjustable flow rate, and uniform melt output can be achieved, alleviating thickness changes, surface defects, and excessive product scrap caused by flow fluctuations.
3. Reduce the operating load of the extruder and improve production efficiency
In traditional extrusion processes, in order to match the pressure requirements of the die head, the extruder needs to withstand high back pressure.
After installing the melt pump, the pressurization work is completed by the melt pump, which can alleviate screw pressure, motor load, and extruder wear. The extruder can focus more on material plasticization and mixing processes.
4. Optimize melt conveying conditions to reduce degradation probability
PVC is sensitive to the residence time of the melt, and the melt pump optimizes the internal flow channel structure to reduce dead corners and minimize material retention. A well-designed PVC melt gear pump can reduce melt retention and local overheating issues, and maintain the stability of material processing.
Core design points of PVC melt gear pump
Based on the processing characteristics of PVC thermal sensitive materials, melt gear pumps are generally designed with targeted measures:
Low shear conveying structure: reduces the shear force borne by the melt, avoids excessive temperature rise, and reduces the risk of material degradation.
High precision gear machining: ensuring smooth gear meshing, uniform output flow, and alleviating pressure fluctuations.
Wear resistant and corrosion-resistant materials: PVC formulations often contain various additives, fillers, and modified components, and equipment materials need to have good wear and corrosion resistance.
Stable temperature control structure: ensures stable operating temperature of the melt pump, reduces changes in melt viscosity and pressure fluctuations caused by temperature fluctuations.
Main application scenarios of PVC melt gear pump
PVC pipe production: improving working conditions such as wall thickness fluctuations and unstable pressure
PVC profile production: improving profile size consistency and optimizing product surface quality
PVC sheet production: improving the uniformity of sheet thickness and enhancing the stability of production operation
Production of PVC modified materials: adapted to high filling and modified PVC systems, improving continuous production performance
The difficulty of PVC processing is relatively high, not because the material itself is uncontrollable, but because the material has high requirements for the stability of the production process.
The melt gear pump alleviates multiple difficulties in the extrusion process of thermosensitive materials by stabilizing the conveying pressure, regulating the metering, reducing fluctuations, and optimizing the flow channel conveying conditions.
For PVC extrusion production lines that pursue finished product quality, smooth production operation, and efficient production line operation, melt gear pumps have become a widely used supporting process equipment.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071
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WhatsApp： +86 158 38331071
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