DEVICE AND METHOD OF CORRECTING EXTRUDATE BOW

摘要

Disclosed apparatus and method to extrude a honeycomb, providing correction in bowing of the extruded honeycomb structure, employs a deflector device having a base plate including an opening aligned in a direction parallel to the extrusion axis through which the plastic material is conveyed to the die. The deflector device includes a bow plate movably mounted to the downstream or upstream side of the base plate. The bow plate includes a constant area aperture. The deflector device positioned upstream of extrusion die imparts a degree of bow reduction by the position of the constant area aperture over the opening imparting a pressure drop gradient on the flow stream entering the die.

主权项

1. A bow deflector device positioned upstream of an extrusion die, the bow deflector device comprising:
a base comprising an aperture of a first constant area to pass a feed stream of plastic batch material therethrough; a bow plate movably mounted to a downstream side of the base, the bow plate comprising an opening of a second constant area less than the first constant area to pass the feed stream of plastic batch material therethrough, wherein by adjusting the bow plate position on the base, bow in a honeycomb extrudate extruded from the extrusion die can be corrected in any direction to “true zero” magnitude.