Abstract:
The invention relates to a material conveying device for feeding at least one injection molding and/or extrusion unit with a non-free-flowing or viscous feed material, having a feed hopper rotatable relative to a bracket about an axis of rotation and a screw conveyor arranged rotatably along an inner jacket surface of the feed hopper in a screw shaft of the bracket, which is designed to convey the feed material from the feed hopper to an outlet, wherein the screw shaft is connected to a hopper outlet of the feed hopper, and wherein the screw conveyor is drivable via at least one drive device. In order to enable the conveying of feed materials with different properties in the simplest possible way, it is provided that at least one media feed channel opens into the screw shaft, which is designed to feed at least one additional medium to the feed material, wherein at least one mixing device is arranged in the region of the screw conveyor and/or downstream of the screw conveyor, which is designed to mix the feed material and the additional medium.
Abstract:
Extruder feed system. The system includes a pair of spaced-apart, internally and oppositely threaded rotatable elements for receiving and engaging a plastic filament material. Sn electric motor rotates the rotatable elements in opposite directions thereby to drive the filament into a liquefier chamber for subsequent discharge through a nozzle. The system provides very accurate layer-by-layer build up.
Abstract:
The present disclosure is directed to tubular fibers and methods of making thereof. In some cases, the fibers may be made of a hydrogel, in some cases an alginate hydrogel. The tube may have a nonsolid inner layer and an outer layer surrounding the inner layer. At least one of the inner layer and the outer layer may contain cells. In some cases, the tubular fiber may be used to study intercellular interactions.
Abstract:
A controlled, variable speed vacuum pump with a flow limiter connected to the suction head of the vacuum pump conveys granular plastic resin material from a supply to receivers retaining and dispensing resin when needed by a process machine.
Abstract:
A system according to various embodiments can include a source for supplying a material to be treated, an extruder, at least two screws, and a drive coupled to the screws for axially rotating the screws. The extruder includes an inlet for receiving the material, which is fed therein in a controlled manner. The screws are provided within the housing of the extruder. The screws have a plurality of compression and release stages that create mechanical heat which is directly applied to the material to change the mechanical properties of the material thereby facilitating a conversion of a physical state of the material from a non-compactable state to a compactable state as the screws rotate and move the material longitudinally along the screws to produce a final product, for example, a feed tub for use as an animal feed.
Abstract:
The invention describes a method for the production and further processing of a film tube (6), in which method a plastic melt is transferred into a cylindrical melt by means of an extrusion die (4), the melt flow is drawn out through an annular gap (5) associated with the extrusion die (4) in order to form the film tube (6), and at least one temperature-controlled volume flow comprising at least one fluid is conducted by means of a temperature control device (8) onto the outer periphery of the film tube (6), wherein the temperature control device (8) is divided into peripheral segments, wherein a volume flow of different magnitude and/or different temperature is produced by means of each peripheral segment such that the temperature control of the film tube (6) differs over the periphery of the film tube, and wherein the film tube (6) is flattened by means of a flattening device (9), the flattening device (9) being rotated in relation to the extrusion die (4). A first volume flow in at least one peripheral segment of the temperature control device (8) differs from the volume flow of other peripheral segments so that at least one thick point (13) is produced on the film tube, wherein the first volume flow is produced by means of adjacent peripheral segments in succession, wherein the first volume flow is produced by means of the corresponding at least one peripheral segment in such a way that the first volume flow is adapted to the rotation of the flattening device (9) such that the at least one thick point (13) assumes substantially the same position in relation to the flattening device (9).
Abstract:
A liquefier assembly for use in an additive manufacturing system to print three-dimensional parts, which includes an upstream pressure-generating stage and downstream flow-regulating stage. The upstream pressure-generating stage includes a drive mechanism, a liquefier configured to melt a consumable material receive from the drive mechanism to produce a molten material in a pressurized state. The downstream flow-regulating stage includes a gear assembly having a casing assembly and a pair of gears disposed within the interior cavity and engaged with each other to regulate a flow of the pressurized molten material through the gear assembly for controlled extrusion.
Abstract:
A process for producing a film is provided and includes extruding a multilayer film with a core component comprising from 15 to 1000 alternating layers of layer A material and layer B material. The layer A material has a crystallization temperature, T1c. The process includes passing the multilayer film across an air gap having a length from 10 mm to 800 mm. The process includes moving the multilayer film across a roller at a rate from 20 kg/hr to 1000 kg/hr. The process includes maintaining the roller at a temperature from T1c—30° C. to T1c, and forming a multilayer film with a layer A having a thickness from 50 nm to 500 nm and an effective moisture permeability from 0.77 to 2.33 g-mil/m2/24 hrs.
Abstract:
An article comprising a) a die core having a plurality of flow paths adapted to flow extrudable material to a plurality of slots including wall slots and skin slots and around a plurality of pins so as to form a honeycomb structure from the extrudable material; and b) a mounting plate adapted to hold the die core in an extrusion system having an opening adapted to allow the extrudable material passed through the die core to exit, an outer portion adapted to mount and hold the die core in place, a flange about the periphery of the opening which seats the die core, an inner surface disposed to partially form the skin slots adapted to allow extrudable material to flow from the skin slots to form the skin of the honeycomb structure; and wherein the die core and mounting plate are comprised of different materials having different wear properties.
Abstract:
An additive manufacturing (AM) system including a platform including a mold die mounted on the platform, the mold die having a surface shape corresponding to a mold cavity used for thermoforming a thermoplastic sheet, and an AM assembly configured to perform an AM method on the thermoplastic sheet having been thermoformed with the mold die. A method for performing AM on a thermoplastic sheet comprises the steps of thermoforming a thermoplastic sheet using a mold die, and performing an AM method on the thermoformed thermoplastic sheet in the mold die as a substrate.