Method of designing and manufacturing a distributor bar for applying a viscous foamable liquid mixture onto a laminator

A production line comprising:

• one or more mixing heads adapted for receiving raw foam materials and producing a viscous foamable liquid mixture;
• a laminator having a predefined width and being adapted for running at a line speed of at least 15 m/min;
• a distributor bar having (i) a central inlet fluidly connected to said one or more mixing heads for receiving said viscous foamable liquid mixture at a predefined flow rate and (ii) a predefined even number of cylindrical outlets fluidly connected to said central inlet via a main channel for depositing said viscous foamable liquid mixture on said laminator, the cylindrical outlets spaced over a predefined length and the main channel having an inner diameter that linearly decreases from a first diameter D1 at its center to a second diameter αD1 at each outer end where α is a constant value in a range of 0.5 to 0.95, wherein the viscous foamable liquid mixture is deposited from cylindrical outlets positioned at each outer end of the main channel directly downward with respect to a direction perpendicular to the laminator and wherein when a ratio of the predefined flow rate entering the central inlet and the predefined length is at least 1.00×10−4 m2/s the viscous foamable liquid mixture will leave each of the cylindrical outlets with an average velocity which is constant for each of the cylindrical outlets within a predefined tolerance margin of at most+/−5%.