A system for making polymeric fibers can comprise a main extruder configured to receive a polymer feedstock composition. The main extruder can have an outlet in fluid communication with a transfer line configured to receive a polymer melt from the main extruder and transfer the polymer melt in a flow direction that is towards a spinneret. A side arm extruder assembly can be positioned along the transfer line between the main extruder and the spinneret. The side arm extruder assembly can comprise an outlet positioned within the transfer line to inject a colored polymer melt concentrate into the transfer line.

Some embodiments are directed to a system for detecting foreign matter in a parison discharged successively from a discharge device, the system comprising: infrared cameras that detect infrared beams emitted from the parison; and a determination unit that determines whether foreign matter is present in the parison on the basis of the infrared beams detected by the infrared cameras. A determination area is set in the parison in a discharge direction of the parison, a storage unit is provided that stores an infrared threshold set for the determination area, and the determination unit compares the detected values from the infrared cameras with the threshold.

The invention relates to a method for the changing of material from a starting material to a subsequent material with an extrusion device (10) for the production of extrusion products (100) comprising the following steps: recognition of a change of material requirement, performance of at least one preparation step for the change of material, performance of the change of material after termination of at least one of the preparation steps.

Method and apparatus for removing bubbles from a molten substrate. The molten substrate from a furnace passes through a downtube to reach additional manufacturing tools, such as an extrusion bushing. One or more ultrasonic sensors are arranged along the downtube. The ultrasonic sensor(s) transmit ultrasonic energy into the molten substrate and measure a characteristic of the ultrasonic energy, such as a propagation time for the ultrasonic energy to be reflected back to the ultrasonic sensor(s). A bubble is detected when a change in the characteristic of the ultrasonic energy is detected. When a bubble is detected, flow through the downtube is diverted to a duct to remove a slug of molten substrate that includes the bubble.

Some embodiments are directed to a system for detecting foreign matter in a parison discharged successively from a discharge device, the system comprising: infrared cameras that detect infrared beams emitted from the parison; and a determination unit that determines whether foreign matter is present in the parison on the basis of the infrared beams detected by the infrared cameras. A determination area is set in the parison in a discharge direction of the parison, a storage unit is provided that stores an infrared threshold set for the determination area, and the determination unit compares the detected values from the infrared cameras with the threshold.

A device for checking the construction of an extruder screw having a shaft and screw elements that are to be pushed or have been pushed one after the other onto the shaft in a defined sequence. Each screw element has an element-specific external geometry. A recording device being provided for determining information concerning the sequence of the screw elements that are to be pushed on or have been pushed on and for comparing the information determined with target information, which directly or indirectly describes the target sequence.

Method for removing bubbles from a molten substrate. The molten substrate from a furnace passes through a downtube to reach additional manufacturing tools, such as an extrusion bushing. One or more ultrasonic sensors are arranged along the downtube. The ultrasonic sensor(s) transmit ultrasonic energy into the molten substrate and measure a characteristic of the ultrasonic energy, such as a propagation time for the ultrasonic energy to be reflected back to the ultrasonic sensor(s). A bubble is detected when a change in the Characteristic of the ultrasonic energy is detected. When a bubble is detected, flow through the downtube is diverted to a duct to remove a slug of molten substrate that includes the bubble.

Method and apparatus for removing bubbles from a molten substrate. The molten substrate from a furnace passes through a downtube to reach additional manufacturing tools, such as an extrusion bushing. One or more ultrasonic sensors are arranged along the downtube. The ultrasonic sensor(s) transmit ultrasonic energy into the molten substrate and measure a characteristic of the ultrasonic energy, such as a propagation time for the ultrasonic energy to be reflected back to the ultrasonic sensor(s). A bubble is detected when a change in the characteristic of the ultrasonic energy is detected. When a bubble is detected, flow through the downtube is diverted to a duct to remove a slug of molten substrate that includes the bubble.

Method for removing bubbles from a molten substrate. The molten substrate from a furnace passes through a downtube to reach additional manufacturing tools, such as an extrusion bushing. One or more ultrasonic sensors are arranged along the downtube. The ultrasonic sensor(s) transmit ultrasonic energy into the molten substrate and measure a characteristic of the ultrasonic energy, such as a propagation time for the ultrasonic energy to be reflected back to the ultrasonic sensor(s). A bubble is detected when a change in the Characteristic of the ultrasonic energy is detected. When a bubble is detected, flow through the downtube is diverted to a duct to remove a slug of molten substrate that includes the bubble.

A 3D drawing arrangement includes a feeding passage, a heater, a filament moving system, and a controller which includes a control circuit and a finger detector electrically connected to the control circuit, wherein when the finger detector detects a presence of a finger of a user which is aligned with the finger detector, the control circuit starts operation of the filament moving system to feed a filament to the heater along the feeding passage, so that the filament is heated and melted by the heater to produce the melted material flow.