Patent ID: 8673206
Filing Date: 2014-03-18
Classification: B29C

Abstract:
1. A method of extruding a honeycomb body with an extruder comprising the steps of: feeding batch material to the extruder, wherein the batch material comprises a ceramic or ceramic-forming material; rotating at least one mixing screw to cause the batch material to travel along a flow path defined by a barrel of the extruder, wherein the batch material is pressurized within the barrel and travels through a first device held in the flow path by a carriage; indexing the carriage to remove the first device from the flow path and introduce a second device into the flow path such that the pressurized batch material thereafter travels through the second device held in the flow path by the carriage, wherein a feature of the extruder is adjusted such that the pressure of the batch material changes less than about 25% as a result of indexing the carriage, wherein adjusting the feature is selected from the group consisting of: adjusting a filter upstream from the carriage; restricting a flow path upstream of the carriage; placing a pattern of apertures between the first device and the second device in communication with the flow path while indexing the carriage; and prefilling the first device, the second device, and or a pattern of apertures with the batch material prior to beginning the step of indexing the carriage; and forming the batch material into a honeycomb body as the batch material exits the extruder.