Dynamic Flow Phenomena in a Foam Application Unit

If, during the operation of a foam application unit, a change in the foam production is introduced, the change in flow becomes noticeable at the point of application only after a certain response delay time. During the operation of the unit it is necessary to take this response delay into consideration. By varying the flow of foam in the application unit, the mass content of foam in the unit is changed as a result of the changed pressure inside the unit. The response delay has been mathematically derived for the flow of a given type of foam through pipes, as well as through a foam printing unit as a whole. A deviation in the yield of foam on the substrate can be avoided by considering the response delay caused in the foam production process