Selection of Melt Pumps for ABS Luggage Extrusion Production

When selecting and applying melt pumps for ABS luggage extrusion processes, it is necessary to comprehensively evaluate material properties, process requirements, and equipment performance. The following is a detailed analysis:

I. ABS Material Characteristics and Process Requirements

Processing Temperature: ABS melt processing temperature typically ranges from 200-240°C, requiring the melt pump to withstand temperatures ≥250°C to accommodate temperature fluctuations.

Viscosity Range: ABS melt viscosity is approximately 1000-5000 Pa·s (medium viscosity), necessitating optimized pump channel design to minimize shear heat.

Pressure Stability: Bag extrusion requires stable pressure (typically ≤30 MPa) to ensure product dimensional accuracy and prevent melt rupture or surface defects.

II. Key Parameters for Melt Pump Selection

Based on ABS process requirements, the following technical parameters are recommended for melt pumps:

Temperature Range:

Operating Temperature: ≤400°C (covering ABS processing temperature with a safety margin).

Heating method: Electric heating or thermal oil heating to ensure temperature uniformity.

Pressure and flow rate:

Inlet pressure: 0–30 MPa (to accommodate the extruder outlet pressure).

Outlet pressure: 0–40 MPa (to meet the die head pressure requirements).

Displacement range: Selected based on the production line scale, e.g.:

Small luggage production line: 50–500 cc/r (e.g., RB-50, RB-100).

Large high-speed production line: 1000–5000 cc/r (e.g., RB-2500, RB-4000).

Viscosity Adaptability:

Maximum Viscosity: ≤40,000 Pa·s (far exceeding the upper limit of ABS viscosity, ensuring stable delivery).

Gear design: Straight or helical gears, with optimized tooth profiles to reduce shear stress and prevent ABS degradation.

Sealing and wear resistance:

Shaft seal type: Spiral seal + packing seal combination, suitable for ABS melt that may contain additives (such as lubricants).

Materials: Gears made of nitrided steel or high-speed steel, pump body made of high-temperature tool steel, ensuring wear resistance and corrosion resistance.

Improved pressure stability:

After adopting the ZB-B series melt pump, a luggage manufacturing company reduced mold head pressure fluctuations from ±2 MPa to ±0.3 MPa, with product thickness tolerances reduced by 50%.

Extended maintenance intervals:

Melt pumps with nitrided steel gears exhibit gear wear of <0.01 mm after 2,000 hours of continuous operation, extending maintenance intervals to six months.

Through the above selection and application solutions, the ABS luggage extrusion process can achieve pressure stability, reduced energy consumption, and improved product qualification rate, with overall production efficiency increased by over 20%.

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