A honeycomb extrusion die body (401) including inlet (414) and exit (402) faces, and a plurality of pins (406) on the exit face (402) defining a matrix of intersecting wide slots (425) and narrow slots (427). The wide slots (425) have an exit width (W1) greater than an exit width (W2) of the narrow slots (427). The die body (401) further includes feedholes (422) at the inlet face (414) and intersecting with inlet portions (416) to the wide slots (425) and/or the narrow slots (427). Some of the pins (406) defining the wide slots (425) include a first surface indentation feature (430) that is (i) located between the inlet portion (416) and the wide slot exit and (ii) spaced away from the wide slot exit. Some of the pins (406) defining the narrow slots (427) include a second surface indentation feature (434) that is (i) located between the inlet portion and the narrow slot exit and (ii) spaced away from the narrow slot exit.

A process for forming a biofilm carrier suitable for use in a moving bed biofilm reactor (MBBR) is presented. A blowing agent is mixed with a plastic material to form a blended material. The blended material is then heated to a temperature where the blowing agent liberates gas by decomposition. The heated blended material is extruded through a die to provide the extrudate with a profile of the biofilm carrier. Advantageously, biofilm carriers produced in this manner have increased effectiveness when compared to conventional biofilm carriers.

A process for forming a biofilm carrier suitable for use in a moving bed biofilm reactor (MBBR) is presented. A blowing agent is mixed with a plastic material to form a blended material. The blended material is then heated to a temperature where the blowing agent liberates gas by decomposition. The heated blended material is extruded through a die to provide the extrudate with a profile of the biofilm carrier. Advantageously, biofilm carriers produced in this manner have increased effectiveness when compared to conventional biofilm carriers.

A catheter is made by coextruding first and second molten polymers, wherein the second molten polymer forms a flexible inner core and the first molten polymer forms exactly two bands on opposite sides of the inner core. The inner core is braided, and a third molten polymer extruded onto the braid to form a flexible jacket that encloses the braid, the bands and the inner core. The bands are more rigid than the inner core, and they provide preferential in-plane bending.

A catheter is made by coextruding first and second molten polymers, wherein the second molten polymer forms a flexible inner core and the first molten polymer forms exactly two bands on opposite sides of the inner core. The inner core is braided, and a third molten polymer extruded onto the braid to form a flexible jacket that encloses the braid, the bands and the inner core. The bands are more rigid than the inner core, and they provide preferential in-plane bending.

A device for determining the temperature of a tubular strand conveyed out of an extrusion device includes at least one temperature sensor configured to measure a first temperature of an outside of the tubular strand at a first position of the tubular strand. An evaluation apparatus further included and configured to compare the first temperature with a second temperature of the outside of the tubular strand at a second position of the tubular strand and determine at least one of a temperature within the tubular strand or a temperature on the inside of the tubular strand at a position of the tubular strand based on the comparison of the first and second temperature.

Kneading elements, extrusion apparatus, and methods of manufacturing honeycomb bodies are described herein. A kneading element (1802) has an inner surface (1804) defining an opening (1806) configured to couple the kneading element (1802) to a shaft (46,48). The kneading element (1802) also has a continuous closed curve elliptical outer surface (1808). The opening (1806) has an axis (1814) that is off-center with respect to a geometric center (1816) of the kneading element (1802) as viewed in a transverse plane perpendicular to the axis.

The invention relates to an extrusion nozzle for an extrusion device for extruding plastic profiles, having at least one nozzle plate (1) which has at least one flow channel (2) for plastic melt, and at least one insert element (4) which is inserted into the at least one flow channel (2) in order to reduce a cross-sectional area of the at least one flow channel (2) through which the plastic melt can flow. At least one holding device (3) is provided in the at least one flow channel (2), on which the at least one insert element (4) is arranged.

An extrusion press device (1) and a method are for an extrusion material (3) which has small loose plant parts, in particular wood chips, provided with binder. The extrusion press device (1) has an extrusion press (7) which presses the supplied loose extrusion material (3) and shapes same into a strand (8) and which advances the strand in an extrusion direction (9). The extrusion press (7) has a shaping device (21) which forms one or more inner tubular cavities in the strand (8) in the extrusion direction (9). The extrusion press (7) forms a continuous strand (8) with one or more inner tubular cavities (29) during the extrusion process, the cavities being closed by the extrusion material (3) at the end face.

An extrusion press device (1) and a method are for an extrusion material (3) which has small loose plant parts, in particular wood chips, provided with binder. The extrusion press device (1) has an extrusion press (7) which presses the supplied loose extrusion material (3) and shapes same into a strand (8) and which advances the strand in an extrusion direction (9). The extrusion press (7) has a shaping device (21) which forms one or more inner tubular cavities in the strand (8) in the extrusion direction (9). The extrusion press (7) forms a continuous strand (8) with one or more inner tubular cavities (29) during the extrusion process, the cavities being closed by the extrusion material (3) at the end face.