A method and device for adjusting the concentricity of a die component of an extrusion assembly relative to a tip component in a manner that minimizes time and effort. The concentricity adjusting extrusion device includes an extrusion die body assembly including a die subassembly and a body, a die tip module and an adjustment sleeve subassembly; wherein said adjustment sleeve subassembly adjusts the concentricity of the die subassembly relative to the die tip module.

An extrusion head and a method for producing an elongated hollow body as an extrudate of an extrusion of extrusion material are provided. The extrusion head includes: a housing; a mandrel mounted in the housing, and a mouthpiece arranged downstream of the mandrel in a direction of extrusion. The extrusion material can flow around the mandrel in the direction of extrusion of the extrusion head. The mandrel includes an end-side mouthpiece section arranged in an opening of the mouthpiece so as to form a circumferential gap between the end-side mouthpiece section and an opening in the mouthpiece, and the mandrel is pivotable about at least one axis transverse to the direction of extrusion to change a geometry of the circumferential gap.

Provide is a blown film forming apparatus including a die including a columnar inner peripheral member and a cylindrical outer peripheral member that surrounds the inner peripheral member, and extruding a resin from a lip formed between the inner peripheral member and the outer peripheral member, and a plurality of die lip drive mechanisms including a fluid pressure actuator as a drive source and adjusting a lip width by applying a radial load to the outer peripheral member, in which the outer peripheral member includes a plurality of load receiving portions to which a load is applied by the die lip drive mechanism, and a stiffness reducing portion that is provided between the plurality of load receiving portions.

A tube forming apparatus for forming polymeric tubing includes a housing between rear and discharge ends. The tube forming apparatus includes a core tube assembly with an exterior core tube and an inner core tube positioned partially therein and in an interior area of the housing. The tube forming apparatus includes a die that has an inner die-surface. A diverter tip is mounted in and extends from the inner core tube into the die forming a die opening between the die and the diverter tip. The tube forming apparatus includes a core tube adjustment system mounted proximate the rear end which includes an axial displacement device configured to axially position the core tube assembly for modulating wall thickness of the tube and/or an angular displacement device configured to modulate the inner core tube for modulating concentricity of the tube.

A die structure is provided. The die structure may have a die body, a mandrel having a magnet and/or one or more magnet assemblies, a first magnetic structure, a second magnetic structure and/or one or more magnetic structures. The first magnetic structure may be configured to apply a first magnetic force to the mandrel, in a first direction. The second magnetic structure may be configured to apply a second magnetic force to the mandrel, in a second direction opposite the first direction. The one or more magnetic structures may be configured to apply one or more magnetic forces to the mandrel. Application of the first magnetic force, the second magnetic force and/or the one or more magnetic forces to the mandrel supports the mandrel to be levitated within the die body and/or causes the mandrel to rotate and/or to maintain a position within the die body.

An extrusion head for pipes includes a first female body provided with a first through cavity and a male element inserted and supported in the first cavity, and defining with it a hollow space. A second female body is attached to the first female body and provided with a second through cavity. An interchangeable male body is attached cantilevered on the male element and positioned in the second cavity. The second female body and the interchangeable male body define a passage gap in fluidic communication with the hollow space. In the second cavity, a housing seating is made in which an adjustment ring is positioned, through which the interchangeable male body is positioned through, and adjustment members configured to adjust the position of the adjustment ring.

A molding apparatus includes: a die provided with a die recessed portion; a core being relatively movable toward a first side and a second side in an axial direction of the die, and forming a flow passage for molten resin between the core and the die; a slider housed in the die recessed portion, having a gap in the die radial direction between the slider and the die recessed portion, the slider being slidable in the die axial direction; and a wall portion forming part of an inner wall in the die radial direction of the die recessed portion, positioned to oppose the core, and extending in such a way that a thickness of the wall portion gradually decreases heading from the first side toward the second side; wherein the wall portion is elastically flexible outward in the die radial direction in a case in which the wall portion is pushed by the molten resin.

The invention relates to a hose extrusion head for producing a hose (50), said head comprising a head housing, a duct (14) formed in the head housing (12) for supplying a hose material (22), a pin (16) which is arranged in the duct (14), a die (18) and at least one securing element (20). According to the invention, the securing element (20) is attached by one end (39) to the die (18) such that said end (39) follows the movement of the die (18).

An extruder having an extruder crosshead, a die, and a die retaining assembly. The extruder crosshead has an annular major surface while the die has a first die surface facing and conformal to that major surface. The die also has a second die surface opposed to the first die surface. The die-retaining assembly is attached to the extruder crosshead, evenly and variably pressing the second die surface with controlled pressure such that the substantially opposing first die surface is pressed into the major surface of the extruder crosshead. The die-retaining also includes movable elements which abut the die in order to move the die. The die-retaining assembly can be used to evenly reduce the pressure exerted by over the second die surface so that the position adjustment elements can be used to more easily adjust the position of the die.

Methods, apparatuses, systems, and techniques relate to an extruder unit for producing preforms with a tube-like wall from a polymer melt and an associated extrusion process. The extruder unit has a receptacle for an exchangeable dispensing tool, it furthermore comprises at least two different and alternately usable profiling devices. These profiling devices have outlet-side fastening structures, which correspond in the various profiling devices and form the receptacle for the exchangeable dispensing tool, so that the profiling devices can be connected alternately to the same dispensing tool. In this way, any dispensing tool, depending on the wish of the customer, can be operated with different profiling devices, in particular, on the one hand, to carry out profiling by mandrel body movement or profiling by nozzle body movement.