Should we choose a gear pump or a rotary pump for conveying glue

When conveying glue, the choice between a gear pump or a rotary pump needs to be comprehensively judged based on the characteristics of the glue, working conditions, and cost budget. The following is a comparative analysis and recommendations of the two:

**1.  Comparison of applicable scenarios**

|* * Features * * | * * Gear pump * * | * * Rotary pump (such as cam pump, screw pump) * *|

|-------------------|-------------------------------|---------------------------------|

|* * Viscosity adaptability * * | Suitable for * * medium high viscosity * * adhesives (such as epoxy resin, hot melt adhesive) | Suitable for * * wide viscosity range * *, including extremely high viscosity adhesives (such as silicone)|

|* * Contains particulate matter * * | Easy to wear, needs to be filtered (particles ≤ 50 μ m) | Better particle resistance (e.g. cam pump can handle particles ≤ 1mm)|

|* * Flow stability * * | Large pulsation, requiring a stabilizing valve | Flow is more stable (especially for screw pumps)|

|Pressure demand * * | High pressure transmission (up to 30MPa or more) | Medium and low pressure scenarios (usually<1.5MPa)|

|* * Precision Measurement * * | Average Accuracy (± 3%~5%) | High Accuracy (such as ± 1% for peristaltic pumps)|

**2.  Key considerations**

**(1) Adhesive properties**

-* * High viscosity+particle free * *: Gear pumps offer higher cost-effectiveness (such as conveying asphalt adhesive).

-* * Containing particles/fibers * *: Choose a cam rotor pump (such as wood glue containing sawdust).

-Corrosive adhesive: Stainless steel/Teflon material is required (both are acceptable, but rotor pumps are easier to customize).

**(2) Process requirements**

-Quantitative filling: Choose a servo motor-driven gear pump (low cost) or a peristaltic pump (high precision).

-Continuous feeding: Gear pump is resistant to high pressure and suitable for long-distance pipeline transportation.

-Hygiene requirements: Sanitary grade screw pumps in rotary pumps are easier to clean (such as food glue).

* * (3) Economy**

-Initial cost: Gear pump (¥ 500~5000)<Rotary pump (¥ 20~20000+).

-* * Maintenance cost * *: The gear pump is easy to replace the gear set, and the rotor pump (such as cam pump) has a longer wear life.

**3.  Recommended plan**

|* * Glue type * * | * * Recommended pump type * * | * * Reason * *|

|--------------------|---------------------------|-----------------------------------------|

|High viscosity hot melt adhesive | High pressure gear pump | High temperature resistance, low cost, suitable for continuous extrusion on production lines|

|Epoxy adhesive containing fillers | Cam rotor pump | Resistant to abrasive particles such as quartz sand, reducing wear and tear|

|Precision dispensing (such as electronic glue) | Peristaltic pump/screw pump | Small pulse, measuring accuracy up to ± 0.5%|

|Food grade silicone | Sanitary grade screw pump | No dead angle design, certified by FDA|

**4.  Precautions**

-* * Testing verification * *: It is recommended to take adhesive samples for pumping tests to observe the actual flow rate and temperature rise.

-Temperature control: High temperature glue requires a pump body heating sleeve (gear pump is easier to integrate).

-* * Backup Plan * *: High value production lines can be equipped with dual pumps in parallel to avoid downtime (modular design of rotor pumps makes them easier to replace).

**Final recommendation * *: Prioritize using gear pumps to handle the transportation of conventional high viscosity adhesives; If the working conditions are complex (including particles, requiring precise measurement, or high hygiene requirements), a rotary pump should be selected,

And choose cam pumps, screw pumps, or peristaltic pumps according to specific needs. Be sure to communicate the medium parameters with the supplier and customize materials (such as silicon carbide seals) if necessary.