Extrusion melt pumps are widely used in fields such as sheet materials, blowing and salivation films, spraying, textiles (fibers and non-woven fabrics), EVA, mixing, granulation, biodegradable materials, etc. Under constant pressure, the melt pump has a lower shear stress design, which reduces the energy consumption of the extruder, lowers the working temperature, and improves the output rate.
The structure of the extruder melt pump is mainly composed of a pump casing, front and rear side covers, gear shaft, sliding bearings, and shaft seal. Its main advantages are as follows: 1. Minimal pressure and flow pulsation, which can achieve linear output of flow and is suitable for precision extrusion systems; 2. Adopting different structures and material configurations for different working conditions to better meet the personalized needs of users; 3. Can be applied to high temperature (350 ° C), high pressure (40MPa), and high viscosity (40000 Paos) working conditions; 4. Precision structure, high precision, and long service life.
For standard extrusion melt pumps, the pump casing and gears are made of nitrided steel, and the bearings are made of tool steel, which has good wear resistance, high toughness, and high cost-effectiveness. It is suitable for most low erosion working conditions. For high wear resistant extrusion melt pumps, the pump casing is made of nitrogen steel, and the gears and bearings are made of tool steel, which has high strength and wear resistance and is suitable for abrasive wear conditions. For high corrosion resistant melt pumps, the pump casing is made of stainless steel, and the gears and shaft sleeves are made of tool steel, which has high corrosion resistance and is suitable for high corrosive working conditions.
Parameters of melt pump for sheet and film extrusion
Transmission medium viscosity: 0.01~40000 Pa · s
Inhalation pressure: 0-30MPa
Output pressure: 0-40MPa
Permissible pressure difference: 25MPa
Operating temperature: ≤ 350 ℃
Heating method: Electric heating
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