Polymer melt gear pumps can be classified into standard, high-wear-resistant, corrosion-resistant, and highly corrosion-resistant types based on their application conditions. Their structure comprises a pump casing, front and rear cover plates, gears, bearings, and shaft seals.

For standard polymer melt gear pumps, they feature good wear resistance, high toughness, and cost-effectiveness, making them suitable for most low-abrasive operating conditions. The pump casing is made of nitrided steel, the gears are also made of nitrided steel, the bearings are constructed from tool steel, and the cover plates are of nitrided steel.

High-wear-resistant polymer melt gear pumps are characterized by high strength and exceptional wear resistance, making them ideal for abrasive wear conditions. The pump casing is made of nitrided steel, the gears are made of high-speed steel, the bearings are also made of high-speed steel, and the cover plates are of nitrided steel.

Corrosion-resistant melt gear pumps combine wear resistance with corrosion resistance, making them suitable for low-corrosive conditions. The pump casing is made of stainless steel, the gears are made of nitrided steel, the bearings are constructed from tool steel, and the cover plates are of stainless steel.

Highly corrosion-resistant melt gear pumps are noted for their high corrosion resistance, making them suitable for high-corrosive conditions. The pump casing, gears, bearings, and cover plates are all made of stainless tool steel.

In polymer extrusion systems, melt gear pumps (also known as melt metering pumps or extrusion pumps) are utilized in various extrusion industries, including sheet, plate, pipe, film, pelletizing, wire drawing, cable, co-extrusion, mixing, precision extrusion, and more.

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