Glue extruder melt gear pump

Glue extruder melt gear pump is a key equipment in the field of glue production and processing, its core function is to realize the stable delivery of high temperature molten glue, pressurization and accurate measurement through the gear meshing movement. The following working principle, core advantages, application scenarios and selection points to analyze:

First, the working principle

Melt gear pumps are based on the design of volumetric pumps, through one or more pairs of precision gears meshing and rotating, forming a continuous change of the sealing volume in the pump chamber. When the gears rotate, the glue is sucked into the gear teeth grooves, and subsequently conveyed to the outlet during the meshing process, and finally extruded at a stable pressure and flow rate. The key features are:

Pressure-flow decoupling: the output flow rate is only related to the gear speed and flute volume, not to fluctuations in outlet pressure, ensuring extrusion stability.

High-temperature adaptability: withstands the high temperatures required for glue processing (typically above 300°C) to avoid material degradation.

High-viscosity processing capability: designed for high-viscosity fluids, effectively overcoming the resistance of glue in transportation.

Second. Core Advantages

Extrusion Stability

Through volumetric conveying, it eliminates the problem of uneven extrusion caused by pressure fluctuations in traditional extruders, and significantly improves the dimensional accuracy and consistency of products.

Typical application cases: In the high-precision extrusion scenarios such as hot melt adhesive and sealant, a flow control accuracy of ±1% can be realized.

Energy consumption optimization

Reduce the load on the main motor of the extruder: The melt gear pump assumes the function of pressure boosting, so that the extruder screw only needs to provide basic conveying power, reducing energy consumption by 20%~30%.

Reduce material degradation: Avoid deterioration of glue performance due to local overheating by stabilizing pressure and temperature control.

Process Flexibility

Supports multi-component co-extrusion: can be integrated with two-component or multi-component glue systems to realize continuous production of products with complex structures.

Adapt to wide viscosity range: by adjusting the gear parameters (e.g., modulus, number of teeth), the glue viscosity range of 100~1,000,000 mPa-s can be covered.

Third.Application Scenarios

Hot melt adhesive industry

It is used for precision coating and molding of high viscosity hot melt adhesive in the fields of packaging, sanitary materials, electronic packaging, etc.

Typical equipment: Melt gear pump in PUR hot melt adhesive extrusion system, which can realize stable flow output of 5~50 g/min.

Sealants & Adhesives

Applied to construction sealants, automotive adhesives and other scenarios, to solve the transportation problems of high-filling type adhesives (such as containing calcium carbonate, glass beads).

Typical example: In silicone sealant production, melt gear pumps can withstand processing temperatures of up to 350°C to ensure material flow.

Composites and 3D printing

In continuous fiber-reinforced composites extrusion, providing a stable flow of resin matrix and guaranteeing uniform fiber distribution.

In 3D printing glue extrusion system, realize micron-level line width control to meet the demand of precision manufacturing.

Fourth, the key elements of selection

Material compatibility

Gear and pump body materials need to match the chemical properties of the glue. For example, for glue containing corrosive components, it is recommended to use Hastelloy or titanium alloy; for high temperature scenarios, Inconel 625 and other heat-resistant alloys.

Pressure and Flow Requirements

Calculate the maximum working pressure (typically 20~40 MPa) and rated flow rate (based on extrusion speed and wire diameter) to ensure that the pump has ≥30% performance redundancy.

Seal structure

For high temperature conditions, prioritize the use of mechanical seals (e.g., double face mechanical seals) or cooled melt dynamic seals to avoid the risk of packing seal leakage.

Temperature control

Integrated heating jacket or runner heating device to ensure that the glue temperature fluctuation in the pump ≤ ± 2 ℃, to prevent curing or degradation.

V. Technology Trends

Intelligent integration

Equipped with pressure, temperature and flow sensors, combined with PLC or Industrial Internet of Things (IIoT) technology to realize real-time monitoring and adaptive adjustment of the extrusion process.

Modularized design

Through the standardized gear set and pump body interface, it supports the rapid replacement of gears of different specifications and shortens the process switching time.

Miniaturization and High Precision

For microelectronic packaging and other scenarios, we develop miniature melt gear pumps (flow rate range 0.1~10 mL/min) to meet the demand for nano-scale coating.

Email: sale@meltpump.com

WhatsApp: +86 158 38331071

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