An extrusion device of a three-dimensional printer comprises a housing, a nozzle, a ratchet, an idler and a cooling mechanism. The nozzle is connected with the housing, the ratchet is disposed in the housing, and the idler is disposed adjacent to the ratchet. A thermofusible material is jointly held by the ratchet and the idler, and is guided to be extruded through the nozzle. The cooling mechanism comprises an air pump and an air pipe. The air pipe is partially disposed in the housing and connected with the air pump for guiding the air extracted by the air pump to flow into the housing through the air pipe, thereby reducing an environment temperature inside the housing. Therefore, by disposing the air-guiding cooling mechanism, the advantages of enhancing the cooling effect and the printing quality are achieved.

A method for replacing one or more components of a lip adjustment assembly mounted to a die body of an extrusion die is disclosed. Initially, a translating unit of the lip adjustment assembly is accessed through an exposed end of the lip adjustment assembly. Then, an adjustment actuator is removed from a translator of the translating unit. The translator is decoupled from a rod of the translating unit so that the translator is removable from the lip adjustment assembly and with respect to the rod. Next, the translator is removed from the lip adjustment assembly and a first component of the translating unit is replaced with a second component of the translating unit.

The invention is directed to a crosshead die for the extrusion of a profile, such as a uniform ply coat for a tire. The crosshead die is used with an extruder, and includes a body. An inlet is formed in the body, and is in fluid communication with the extruder. An outlet and a flow channel are also formed in the body. The flow channel extends between the inlet and the outlet, and is bounded by an upper wall, a lower wall, a first side wall, and a second side wall. The flow channel is formed with a bend and a cross section that includes a trapezoidal shape to align the flow of elastomer with the center of the flow channel.

An extruder for multi-lumen tubular products with multi-coronal arrangement comprises a main body (2) defining a passage cavity (2a) and an average outflow direction (2b), as well as an input surface (3) and an exit surface (4) respectively formed on opposite faces of the main body (2) and defining respective entry areas afferent to and efferent from the passage cavity (2a); the extruder further comprises an expansion portion (4a) associated with the exit surface (4) and adapted to mutually orient spontaneous expansive flows of said extrusion material through the exit surface (4) in reciprocal directions of mutual intersection.

An extrusion head having a perforated plate of a granulating system. The extrusion head can have a head part and a perforated plate with a perforated-plate wear insert, a perforated-plate main body, a central inflow cone, an inflow cone part, a plurality of nozzle channels, a plurality of perforated dies, and at least one corrosion protected fastener. The perforated-plate can be detachably fastened to the head part. The head part can have at least one central melt channel into which the inflow cone part projects and distributes a melt flow among nozzle channels which can be arranged in the shape of a ring and among the perforated dies which can be arranged in at least one ring. The at least one fastener can be positioned in a central region of the at least one ring of the perforated dies.

A method is disclosed for dispensing a polyurethane mixture onto a substrate by generating a liquid mixture from reactive component resins; introducing the mixture in an inlet section of a dispensing device so as to advance it towards a planar-shaped outlet slit section, transversely to the advancement direction of the substrate; distributing the mixture along a gap chamber having a cross section diverging towards the outlet slit section; and dispensing the mixture through the outlet slit section, so as to deposit a thin, uniform film onto the substrate. Fractions of the mixture travel equal distances from the inlet section to the outlet slit section, in equal times, maintaining equal average speeds along each section having zones placed all at the same path distance either from the inlet section or from the outlet slit section.

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.

An apparatus for extruding a jacket and/or insulative material onto an extruded product with one or more longitudinal stripes incorporated onto the surface of said extruded product comprising a body, a primary feed conduit for conveying a primary extrusion material, a striping die, a secondary feed conduit for conveying a secondary extrusion material, a striping die adapter, a striping feed conduit extending through the striping die adapter for conveying striping extrusion material. The striping die adapter may also include a thermocouple for maintaining the viscosity of the striping extrusion material and a thermocouple for monitoring the temperature of said striping die adapter. The striping die includes one or more striping extrusion outlets for conveying striping extrusion material onto the extruded product. The striping die may also include a wishbone-shaped trough for delivering equal amounts of striping extrusion material to said extrusion outlets for extrusion onto the product.

An extruder head assembly includes an extruder head having an extrusion line which is inserted in a cylindrical seat formed in said extruder head; the extruder head includes a locking means configured to hold the extrusion line in a working position; the locking means being actuated to release the extrusion line and allow the extraction thereof from the seat. The locking means include dowels that are radially movable between a locking position and a release position, the release position allowing the extraction of the extrusion line.

The present invention provides a system and method for quickly removing and installing a filament tube and nozzle in an FFF extrusion system. The system utilizes a primary manifold that includes a cooling block, a heating block and a quick-change mechanism. This primary manifold is adapted to mate a filament tube/nozzle assembly. The quick-change mechanism, which in a particular embodiment utilizes a recessed biased-bearing arrangement, enables the filament/nozzle assembly to be removed and inserted without the use of any tools, and without causing any significant downtime for the FFF extrusion system. Once removed, the filament tube/nozzle assembly can be refurbished by a technician, trained so as not to over torque the tube/nozzle threaded interface. This refurbishment (typically consisting of a cleaning and the installation of a new nozzle) could be accomplished off-line, without any impact on the continued use of FFF extrusion system.