A filtering device for filtering molten plastic material that employs a filtration mesh belt that enters and exits a chamber, engaging an outer surface of a hollow perforated cylinder inside of the chamber, without losing any molten plastic material during the replacement of the filtration mesh belt and without tearing even when operating at high pressures inside of the chamber.

The invention relates to a plant for producing a coextruded multilayer film with at least one extruder device for providing material melts of thermoplastic materials, with a device comprising a coextrusion adapter and a nozzle part for coextruding a multilayer coextrusion composite of interconnected individual layers, wherein the coextrusion adapter has a central channel for producing a central layer of the coextrusion composite, at least one coextrusion channel for producing at least one further layer of the coextrusion composite interacting with the central layer, a plurality of displaceable adjusting elements for adjusting layer thicknesses and/or layer thickness profiles of individual layers of the coextrusion composite, and adjusting devices for actuating the adjusting elements, having a drive unit for driving the adjusting devices, having a measuring device for measuring layer thicknesses and/or layer thickness profiles of individual layers of the multilayer coextrusion composite, the measuring device being set up to measure the individual layer thicknesses and/or the individual layer profiles downstream of the nozzle part, and having a system controller for controlling the system, wherein the system controller comprises a controller unit which is set up so that relative positions of adjusting elements can be manipulated automatically, preferably iteratively, by means of the drive unit as a function of layer thicknesses and/or layer thickness profiles measured on the multilayer film already leaving the nozzle part.

An apparatus including a three-dimensional (3D) drawing pen can permit a user to draw in free space to form a 3D object. The 3D drawing pen can include a housing, an actuator, and a nozzle assembly. The housing is configured to receive material therein and fit in a user's hand. The actuator is coupled to the housing and is configured to control a movement of the material. The nozzle assembly is configured to permit the material to be extruded to permit the user to form the three-dimensional object.

The invention relates to a system (10) for transporting a film tube (2) in a blown film line (1) along a transport direction, having a guiding unit (51) for guiding the film tube (2), a bottleneck (13.1) at which a width (2.3) of the film tube (2) can be reduced, a severing apparatus (20) having at least one severing element (21) for severing the film tube (2), wherein the guiding unit (51) is arranged downstream of the bottleneck (13.1) in the transport direction of the film tube (2). The invention furthermore relates to a blown film line (1) and to a method (100) for producing a film.

A method for producing an elongated article with a sheath. The sheath is extruded with a predetermined wall thickness in an extrusion unit. Following the extrusion unit in a feeding direction, a part of the still moldable material is built up with the aid of a molding unit during a molding process such that a molded part forms integrally on the sheath. The molding unit is moved according to the following working cycle: the molding unit is accelerated from a starting position in the feeding direction, then it is advanced in the direction of the elongated article and the molded part is formed, the molding unit is withdrawn from the elongated article, and the molding unit is decelerated and moved from an end position, counter to the feeding direction, back in the direction of the starting position.

An extrusion crosshead assembly for manufacturing braid reinforced tubing includes a body having a bore housing an outer deflector, an outer spline concentrically mounted within a bore of the outer deflector, an inner spline concentrically mounted within the outer spline and forming a plenum therebetween, an inner deflector concentrically mounted within a bore of the inner spline, and a hollow tip body mounted concentrically within a bore of the inner deflector.

A ram extrusion apparatus including a die having several thermal zones, a hopper for introducing a granular polymer resin to the die, and a ram for moving the granular polymer resin through the thermal zones of the die and out from an outlet end thereof at a temperature above the crystalline melt temperature of the polymer resin. The hopper may be designed to deliver the polymer resin into a resin inlet of the die in a plurality of specifically metered amounts which may vary across a width of the resin inlet end of the die. The apparatus may further include one or more finishing tables positioned after the outlet end of the die for receiving and moving the extruded resin away from the outlet end of the die so that there is no backpressure on the extruded resin, and which provide compression force and even cooling to the extruded resin.

A continuous filtration device for molten plastic materials that employs a filtration mesh that enters and exits the filtration chamber, resting against the outer surface of a perforated hollow cylinder, without losing any molten material during the replacement of the mesh and without tearing even when operating at high pressures inside the filtration chamber.

The present invention relates to a device (10) for the generation of a negative pressure for stabilizing a melt strip (200) in the area of a transport device (120) of a film machine (100) particularly with a production process of a plastic film (230) comprising: at least one main chamber (20) for generating a first negative pressure in a first influence area (310) at least one auxiliary chamber (30) for generating a second negative pressure in a second influence area (320), wherein the first influence area (310) is assignable to at least one main area (210) of the melt strip (200) and the second influence area (320) is assignable to at least one edge area (220) of the melt strip (200) adjacent to the main area (210), and wherein the first negative pressure differs from the second negative pressure in order to effect a stabilization of the melt strip (200).

An extrusion device includes a material inlet for feeding an extrusion material into the extrusion device; a material outlet, which is arranged opposite the material inlet along an axis, in order to expel the extrusion material from the extrusion device; a material guidance system for guiding the extrusion material from the material inlet to the material outlet; a body, which is arranged on the axis, is movable along the axis, passes through the material outlet and is designed in such a way that, as the body moves along the axis, a cross-sectional area through which the extrusion material is expelled from the material outlet changes; a drive device, arranged along the axis, for moving the body along the axis; a cooling line system for guiding coolant. Here, a first part of the cooling line system is arranged in the interior of the body and is suitable for guiding the coolant along the axis, a second part of the cooling line system is suitable for guiding the coolant out of the body away from the axis and for conducting said coolant around the drive device, and a third part of the cooling line system is suitable for guiding the coolant outwardly into a discharge line for the coolant at an incline to the axis. The second part of the cooling line system adjoins the first part of the cooling line system, and the third part of the cooling line system adjoins the second part of the cooling line system against a flow direction of the extrusion material from the material inlet to the material outlet.