METHOD AND SYSTEM FOR REORIENTING FIBERS IN A FOAM FORMING PROCESS

A method for foaming a web is disclosed. The foamed fiber suspension is fed into a mixing chamber and then directed through a constriction in which the speed of the foamed fiber suspension is increased. From the narrow constriction, the foamed fiber suspension enters the forming chamber, which causes the velocity of the foamed fiber suspension to be rapidly reduced. For example, in one embodiment, the foamed fiber suspension undergoes a hydraulic jump, resulting in significant fiber reorientation. By means of the method, fiber orientation can be controlled. For example, a web having a comparable fiber orientation in the longitudinal direction can be produced compared to the transverse direction. 公开了一种用于对幅材进行泡沫形成的方法。将发泡纤维悬浮液馈送到混合室中，并且随后引导通过狭窄收缩部，在所述狭窄收缩部中，所述发泡纤维悬浮液的速度增加。从所述狭窄收缩部，所述发泡纤维悬浮液进入成形室，这使得所述发泡纤维悬浮液的速度迅速减小。例如，在一个实施方案中，所述发泡纤维悬浮液经历水跃，从而引起显著的纤维重新定向。通过所述方法，能够控制纤维定向。例如，与横向相比，能够生产出在纵向上具有相当的纤维定向的幅材。