Die Lip and Gap Adjustment Systems
topic
Slot die lip gap adjustment systems use thermal expansion bolts, piezoelectric actuators, or manual adjustment screws positioned at regular intervals across the die width to locally adjust the slot gap and therefore the local coating flow rate, correcting for the cross-direction coating weight profile that deviates from uniform due to die geometry tolerances, compound rheology, and substrate interaction effects, with automatic adjustment responding to inline gauge measurement feedback.
Role
Achieves and maintains the coating weight uniformity required for high-specification functional coatings through local flow rate correction across the die width that compensates for the inevitable non-uniformities in compound flow distribution from die manufacturing tolerances, with automatic lip gap adjustment linked to inline gauge measurement providing the closed-loop coating weight profile control required for precision coating applications in optical, electronic, and medical coated product manufacturing.