Meaning
Viscous fluid deposits often leave elongated, irregular trailing edges at the conclusion of a discontinuous application cycle. Intermittent coating tailing occurs when the fluid delivery system fails to achieve an instantaneous, clean cutoff at the die exit. This phenomenon results in uneven film distribution and potential contamination of the underlying substrate surface areas intended to remain uncoated.
Process Mechanism
Hydraulic pressure dynamics within the delivery lines drive the formation of these excess deposits. Residual fluid momentum pushes past the intended stop point as the valve mechanism initiates closure. High viscosity fluids exacerbate this effect by creating stringing patterns rather than sharp breaks.
Mechanical adjustments to the vacuum extraction ports or valve response times reduce these deviations during high speed production.
Production Outcome
Material waste rates increase when automated inspection sensors reject units bearing visible surface defects. Precision during manufacturing requires calibration of the pressure relief sequence to prevent lingering discharge from the applicator. Excess fluid accumulation at the termination point necessitates secondary cleaning protocols to maintain machine output quality.
Performance Constraint
Operational limits depend on the shear thinning properties of the specific substance applied during the cycle. Faster machine speeds demand shorter valve closure windows that occasionally outpace the physical reaction of the fluid. Stable film production ceases when the tail length exceeds the tolerances set by the final product specification.
