Melt Pump for Strapping Production Lines

I. Core Functions: Stable Delivery and Precise Metering

Stable Pressure and Flow Control

The melt pump utilizes a sealed chamber formed by gear meshing to pressurize the melt output from the extruder and deliver it stably to the die head. Its outlet pressure fluctuations can be controlled within ±1%, with flow accuracy reaching ±1%, completely eliminating flow instability caused by pressure fluctuations in the extruder. For example, in PET strapping production, the melt pump maintains constant die pressure, preventing surface defects (such as “shark skin” patterns) caused by uneven melt flow. This boosts product yield from 92% to 99.5%.

Linear Flow Output and Specification Consistency

Each gear revolution delivers a constant displacement volume. Combined with speed regulation, this enables linear control of melt flow. This characteristic ensures uniform material usage per strap segment, significantly improving consistency in thickness, width, and weight. Using biaxially oriented polypropylene (BOPP) film production as a reference, melt pumps reduce film thickness deviation from 5% in traditional processes to below 1%. Similarly, this principle applies to enhancing strap dimensional accuracy.

II. Structural Features: Adapted for High-Temperature, High-Viscosity Environments

Key Component Design

Gears and Bearings: Utilize high-precision gears (ISO Class 5 accuracy) and wear-resistant materials (e.g., nitrided steel) to withstand melt temperatures of 250-350°C and viscosities of 100-10,000 Pa·s.

Sealing System: Packing seals or mechanical seals prevent melt leakage, ensuring pressure stability.

Temperature Control System: Multi-stage heating and cooling channels precisely regulate melt temperature, preventing material degradation caused by thermal gradients.

Modularity and Intelligence

Supports customizable flow ranges (e.g., 0.1-5000 cc/rev) based on production requirements;

Integrated pressure sensors and closed-loop control systems enable automatic parameter adjustment;

Compatible with diverse materials (PP, PET, recycled feedstock) and highly filled systems (e.g., calcium carbonate content exceeding 30%).

III. Application Scenarios: Comprehensive Coverage of All Strapping Tape Categories

General-Purpose Strapping Tape

In PP and PET strapping tape production lines, the melt pump forms a “golden combination” with the extruder and die head, ensuring stable melt delivery and eliminating thickness fluctuations to meet standard packaging requirements.

Premium Specialty Strapping

High-Strength Strapping: Precisely controls draw ratio via melt pump, stretching preforms 3-6 times after heating to enhance tensile strength;

Recycled Material Strapping: Stabilizes viscosity fluctuations in homogenized recycled materials, ensuring melt index consistency (e.g., reducing HDPE recycled material melt index variation from ±15% to ±3%);

Functional Strapping: For flame-retardant or anti-static strapping, melt pumps ensure stable delivery of additive-containing melts, preventing component segregation.

The melt pump is the critical equipment enabling high-quality, high-efficiency, and low-cost production in strapping line operations. By stabilizing pressure and flow, ensuring precise metering, homogenizing the melt, and reducing energy consumption, it directly enhances product dimensional accuracy, mechanical properties, and production efficiency while lowering equipment maintenance costs and energy usage.

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