Methods, apparatuses, systems, and techniques relate to a tube-forming device for an extruder unit or an extrusion device and a tube-forming process. The tube-forming device comprises at least one shaping sleeve, which is designed to shape a supplied stream of polymer melt from a substantially strand-like cross section into a tubular cross section. The shaping sleeve has a guiding passage embedded in the sleeve wall, such that the guiding passage is a cavity which lies within the sleeve wall and, in the radial direction of the shaping sleeve, is enclosed in a sealed manner with respect to the outer surfaces.

A flexible tube production apparatus includes a die composed of: a cylindrical inner die having an outer face in which a groove is formed; a tubular member that is housed inside the inner die, and has a through-hole that allows a blade wire to be inserted from one end to the other end thereof; and an outer die that surrounds the inner die such that a predetermined gap is generated between itself and the outer face of the inner die, and has an extrusion hole that extrudes the resins having been supplied to the gap, onto the outer face of the blade wire that is fed from the other end of the tubular member. A resin supply portion supplies a first resin and a second resin to the die while the motor rotates the inner die about a center axis.

An extrusion nozzle for making tubular preforms has a mandrel extending along a vertical axis, an annular and stationary nozzle body spacedly radially surrounding the mandrel, and a holding ring having an upper end axially slidable in the nozzle body, braced axially downwardly against the nozzle body, and having a lower end spaced radially inward from shiftable limitedly radially relative to the nozzle body. A nozzle ring has an upper end axially slidable in the holding ring, is braced axially downwardly against the nozzle body, and has a radially deflectable lower end forming an annular extrusion gap with the mandrel. A first positioner engages the lower end of nozzle ring and is operable to radially deflect this lower end. A second positioner engages radially with the lower end of the holding ring or with the nozzle ring for radially deflecting same.

A multiple extrusion head for manufacturing parisons from thermoplastic material includes a stationary arranged base frame and a multiple of extrusion heads arranged on the base frame. Each of the extrusion heads has a material inlet, a ring die in fluid connection to the material inlet, an outer die element and an inner die element arranged coaxially to each other, an adjustment element displaceable along a longitudinal axis of the multiple extrusion head, and spring supports arranged between the base frame and the adjustment element. The spring supports are supported in a biased manner against the base frame and the adjustment element such that such that tilting moments between the extrusion heads is reduced.

A molding apparatus includes: a die; a core disposed at the inner side of the die; a slider housed in a die recess provided in the die; a rod having a leading end portion housed in a slider recess formed in a face of the slider, the leading end portion of the rod being unconnected with the slider; and a movement mechanism, the die including a wall portion that forms part of an inner wall of the die recess, and the slider recess having a shape that widens on progression toward an outer side in a radial direction of the die or that runs along a radial direction of the die.

The invention relates to an annular die on an extrusion head for producing tubular or sheet-like preforms with an arcuate die gap and with a melt channel delimited by a mandrel and a die body, the cross-sectional profile of the melt channel being variable by way of adjusting elements, the annular die according to the invention being distinguished by the fact that the outer circumference of the melt channel is at least partially delimited directly by at least one radially adjustable slide, that the slide is formed by a number of segments that can be adjusted together from at least one first position into at least one second position, and that the segments in each position form a respectively closed arc portion of the delimitation of the melt channel, the radius of the arc portion being different according to the position of the segments.

An extrusion die is part of a hollow profile extruder. The extrusion die has a die housing. An extrusion annulus is inwardly defined by a mandrel and outwardly defined by a die ring. The mandrel is held and supported by a housing-side mandrel support. The mandrel support is mounted by a tilt joint tiltably relative to the tool ring by two degrees of freedom. Depending on the tilted position of the mandrel support, a distribution of a width of the extrusion annulus can be adjusted. A centering device serves to set the tilted position of the mandrel support. The result is an extrusion die, which ensures manageable adjustment of a wall width of a hollow profile in mass production.

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.

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 cutting device for comminuting pasty substances, has a nozzle with a nozzle housing which has at least one inlet and one outlet. The inlet has an entry flow cross section through which the pasty substance enters the nozzle. The outlet has an exit flow cross-section through which the pasty substance exits the nozzle. A flow duct leads from the inlet to the outlet. A rotating cutting tool is disposed on the outlet for cutting the exiting pasty substance. The exit flow cross-section has the shape of a closed or interrupted annular gap which is formed by a central member within the nozzle and an internal wall of the flow duct. The central member in the conveying direction of the pasty substance increases in terms of the cross section.