Selection of PET sheet extrusion melt pump

When selecting a melt gear pump for PET sheet extrusion, several crucial factors must be taken into account to ensure that the pump's performance meets production requirements and guarantees the quality of PET sheets. Here are the key selection points:

I. Production Demand

Firstly, it is essential to clarify the production demand of the production line, measured in kg/h. Production demand serves as a significant basis for choosing the model of the melt pump, as different models have varying conveying capacities that must align with actual needs.

II. Application Field

Considering the specific application fields of PET sheets (such as packaging, construction, electronics, etc.), it is necessary to select a melt pump suitable for those fields. Different applications may have varying requirements for the pump's performance, including pressure stability, flow accuracy, etc.

III. Characteristics of the Conveyed Medium

Polymer Type: As PET is the primary conveyed medium, its physical and chemical properties are crucial in selecting the melt pump. PET's high melting point and viscosity necessitate a pump that can withstand high temperatures, high pressures, and wear.

Viscosity Range: The viscosity of PET melt typically falls within a specific range. When selecting a melt pump, ensure it can handle media within this viscosity range. Generally, the pump's conveying medium viscosity range should encompass the viscosity value of PET melt.

IV. Pressure and Flow Requirements

Pressure Requirement: During PET sheet extrusion, the melt pump must withstand a certain pressure. Therefore, choose a pump with sufficient pressure-bearing capacity based on the production line's pressure requirements. Additionally, the pump's output pressure should also meet production demands.

Flow Accuracy: To ensure the uniformity and quality stability of PET sheets, the melt pump must have high flow accuracy. This requires the pump to maintain a stable flow output during conveying.

V. Pump Structure and Material

Pump Body Material: The pump body material should possess excellent heat resistance, wear resistance, and corrosion resistance. Stainless steel, alloy steel, and other similar materials are common choices.

Gear Type: Melt pumps typically employ gear transmission. The gear material and tooth shape significantly impact the pump's performance. Nitrided steel, tool steel, and other materials, as well as straight-cut or helical cylindrical gears, are common selections.

Sealing Structure: The pump's sealing structure must prevent medium leakage and possess good heat resistance. Common sealing methods include melt dynamic sealing, packing sealing, and mechanical sealing.

VI. Heating and Cooling Systems

Melt pumps generally require a heating system to maintain stable media temperature. Thermal oil heating is a common heating method. Additionally, for applications requiring cooling, consider the pump's cooling system.

VII. Brand and After-sales Service

Choosing a renowned brand of melt pump ensures product quality and performance. Simultaneously, excellent after-sales service is another vital factor to consider. Renowned brands typically have comprehensive after-sales service systems and technical support capabilities, providing timely technical consultations and maintenance services to users.

In summary, selecting a melt pump for PET sheet extrusion involves considering production demand, application field, conveyed medium characteristics, pressure and flow requirements, pump structure and material, heating and cooling systems, as well as brand and after-sales service. By comprehensively evaluating these factors, one can select a melt pump model that meets production needs.

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