Slot Die Design and Flow Distribution
topic
Slot die internal geometry uses manifold design with coat hanger or T-slot flow distribution chambers that achieve uniform flow velocity across the full die width within plus or minus 2 percent by optimising the manifold taper geometry to compensate for pressure drop from the centre to edge flow path differences, with slot gap of 100 to 500 micrometres controlling the flow velocity and bead formation at the die lip that determines coating weight uniformity.
Role
Achieves the coating weight uniformity that distinguishes slot die coating from knife and gravure methods by ensuring equal compound flow rate per unit width across the full die width through precision manifold design that eliminates the centre-to-edge flow variation that would otherwise create a coating weight profile thicker at the centre than at the edges on wide coating machines.