摘要:
A mixing/extruding apparatus having a mixer/extruder provided with a diverter, an electric motor for driving this mixer/extruder, and a power supply device for supplying a drive power to this electric motor, and the power supply device includes a start-up power supply portion for supplying a drive power with which the electric motor is rotated at low speed with a smaller output than an output generated upon the normal operation to the electric motor, an operation power supply portion for supplying a drive power with which the electric motor is rotated at high speed with the output generated upon the normal operation to the electric motor, and a power supply switching device for switching the drive power from the start-up power supply portion to be supplied to the electric motor to the drive power from the operation power supply portion.
摘要:
An extrusion line for producing plastic profiles, preferably plastic pipes, comprising at least one extruder, one die, one calibration means and further following devices. The die has at least one aperture, and an extraction means arranged in front of the die as viewed in the extrusion direction, and the die consists of a plurality of functional regions with separate melt channels. Furthermore, the invention relates to increasing the cooling performance of an extrusion line for extruding a plastic profile, in particular a plastic pipe, which comprises the following steps, a) melting plastic in an extruder, b) shaping a plastic strand and feeding the plastic strand to a die, c) shaping a plastic profile by means of the die, and d) calibrating and curing by cooling the profile, the profile being cooled in the interior in addition to outer cooling.
摘要:
A system and method for forming an article from thermoplastic material and fiber. The method includes heating thermoplastic material to form a molten thermoplastic material for blending with the fiber. The molten thermoplastic material is blended with the fibers to form a molten composite material having a concentration of fiber by weight. The molten composite material may then be extruded through dynamic dies to deliver discrete controlled material that is gravitated onto a lower portion of a mold. The lower portion of the mold may be moved in space and time while receiving the flow of composite material to deposit a predetermined quantity of molten composite material thereon conforming to mold cavities of the lower and an upper portion of the mold. The upper portion of the mold may be pressed against the predetermined quantity of molten composite material and closing on the lower portion of the mold to form the article.
摘要:
A system for controlling the dimensions of an extrudate exiting an extruder and for compensating for the variations in the extrusion rate of the extruder, expansion rate and rate of travel of the extrudate through sizing devices by changing the speed of an extrudate puller device, includes an extruder which extrudes the extrudate; a conveyor system comprising rollers and a series of sizing devices; a puller device for pulling the extrudate through the sizing devices; and a laser proximity measuring device to assist the system in keeping the desired shape of the extrudate. The laser proximity measuring device includes at least one pair of optical non-contact displacement transducers, a real time processor, and an interactive touch screen display unit. The transducers emit a laser beam which provides a laser point on the side of the extrudate.
摘要:
The present invention is directed to a materials extrusion device including a screw extruder with a plunger feeder. It includes a screw extruder having a main housing, a materials advancing screw, a screw drive mechanism, a feed port for inputting materials to be extruded and an extrusion outlet port. It also includes a plunger feeder having an elongated, upwardly biased (non-horizontal) plunger housing, e.g., a cylinder, with a plunger. A plunger drive mechanism is connected to the plunger to move the plunger upwardly and downwardly within the plunger housing, and there is a feed outlet at an upper end of the plunger housing, the feed outlet being connected to the screw extruder feed port.
摘要:
The invention describes a method for setting the sizes of film tubes (1), which are extruded by blow film plants (15), in which method the film tube size is changed from an initial size of a film tube (1) to a final size of a film tube (1), and in which the location of the frost area (3) is optimized during the size change by setting the output of the cooling fan.Physical parameters of the initial and final size of the film tube (1) are stored in the control device (31). The control device (1) takes these physical parameters into account when generating control signals. Furthermore, these control signals form the basis for the control of the cooling fan output
摘要:
A method of improving energy consumption and/or melt quality of injection molding or extrusion machine can include controlling energy input to the melt from screw drive and heat sources. One or more sensors can measure a present value of at least one process parameter associated with the melt. A control algorithm can compare the present value of melt with a set value. If the present value deviates from the set value by more than a predetermined amount, the set value of at least one operating parameter can be adjusted. The algorithm can determine energy transferred to melt material from thermal and mechanical sources, and adjust set values to optimize energy consumption or improve melt quality. Process parameters can include melt temperature, melt quality characterized value, prospective throughput or injection cycle time, or prospective energy consumption value. Operating parameters can include barrel heating temperature, screw rotational speed, screw plasticizing back pressure, screw injection speed or screw injection pressure.
摘要:
In an extruder or a kneader, load (torque T) values on an input shaft portion of a screw shaft are detected by a load detector installed on the input shaft portion, then an overload condition is determined from a load mean value (Ta) and a load amplitude value (Tw) of the detected load values, and the issuance of an “abnormal” alarm and/or the stop of rotation of the screw shaft are (is) performed when an overload duration time (t0) of maintaining the overload condition exceeds a set time (ts). In this way the screw shaft is protected from fatigue fracture caused by application thereto of such a load as does not exceed a designed mechanical strength but causes fatigue fracture.
摘要:
A system and method for forming an article from thermoplastic material and fiber. The method includes heating thermoplastic material to form a molten thermoplastic material for blending with the fiber. The molten thermoplastic material is blended with the fibers to form a molten composite material having a concentration of fiber by weight. The molten composite material may then be extruded through dynamic dies to deliver discrete controlled material that is gravitated onto a lower portion of a mold. The lower portion of the mold may be moved in space and time while receiving the flow of composite material to deposit a predetermined quantity of molten composite material thereon conforming to mold cavities of the lower and an upper portion of the mold. The upper portion of the mold may be pressed against the predetermined quantity of molten composite material and closing on the lower portion of the mold to form the article.
摘要:
An apparatus for processing thermoplastic synthetic plastic material to be recycled comprises a first receptacle (1) and a second receptacle (2) for the material to be processed. Within both receptacles (1, 2) tools (21) for mixing and heating the material circulate around a vertical axis each. The material reaches the second receptacle (2) which is connected to an evacuating means (9), from the first receptacle (1) through a connecting conduit (3). The first receptacle (1) has above an intake opening (19) for the material to be processed, and the mouth of the connecting conduit (3) in the second receptacle (2) is disposed at a higher level than the tools (21) circulating in this receptacle (2). The material processed is carried off the second receptacle (2) through a discharge opening (49) by means of at least one screw (47), whereby this receptacle is vacuum-tightly closed. To the intake opening (19) of the first receptacle (1) that also is connected to an evacuating means (9), a sluice (6) is connected. In both receptacles (1, 2) at least two tools (21) each circulate in different levels, disposed one upon the other, wherein the intake opening (19) in the first receptacle (1) is disposed higher than the uppermost tools (21) circulating in this receptacle 1. The discharge opening (49) of the second receptacle (2) is disposed at least substantially at the level of the lowermost tools (21) circulating in this receptacle (2). In each one of the two receptacles (1, 2) at least one temperature sensor (32) is provided for each plane of the circulating tools (21) which sensor is disposed higher than its associated plane.