Automated Meter Mix Dispensing Dynamics for Thermally Conductive Gap Fillers
Volumetric displacement precision, shear rate thermal control, and wear-resistant fluid metering govern automated thermal gap filler dispensing performance.
Dynamic Mix Head
Meaning
Motor-driven chamber containing a rotating element that actively blends two or more reactive liquid components just prior to dispensing. Using a dynamic mix head is common when processing multi-part adhesives or polyurethane gap fillers that require rapid, high-shear blending of unequal volumes. This device ensures that the catalyst and base material combine thoroughly even when viscosity differences exist between the streams.
Operating Principle
Separate fluid streams enter the mixing chamber under low pressure through dedicated inlet ports. A rotating impeller or pin-style rotor spins at high speeds within the chamber, shearing the materials and forcing them into a single, uniform compound. This active agitation of the dynamic mix head creates a homogeneous mixture before the curing reaction can progress significantly.
The shear force generated is controlled by adjusting the rotational speed of the motor.
Mixing Efficiency
Proper blending prevents unreacted resin pockets from compromising the structural strength of the cured adhesive. It ensures consistent curing times.
Maintenance Requirement
Frequent flushing is necessary because reactive material remains within the chamber and will cure if flow stops. Automated solvent purge cycles or disposable plastic chambers are utilized to prevent permanent clogging and hardware damage. Monitoring the rotational torque provides an early warning of material buildup before complete system seizure occurs.