Product category:
Extrusion machines
News Release from: Milacron | Subject: Parallel twin screw plastics extruders
Edited by the Manufacturingtalk Editorial
Team on 07 August 2006
Parallel twin screw extruders save on
costs
Designed for producing siding, fence, pipe and profiles, parallel twin screw extruders deliver high outputs and exceptionally wide processing window, along with cost- and space-savings.
Whatever the application - rigid profiles, flexible PVC pelletizing or woodflour plastics composites - Milacron beats the field with the highest output, hardest working parallel twin screw extruders Represented at NPE by the Cincinnati Milacron TP115-26, the parallel twin extruders deliver best-in-class outputs and exceptionally wide processing window, along with significant cost- and space-savings
This article was originally published on Manufacturingtalk on 12 Jul 2005 at 8.00am (UK)
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Four machine sizes with 93, 115, 140 and 172 mm diameter screws give processors a right size machine for PVC pipe, window profiles, siding, sheet, and wood/natural fiber plastic composites, as well as rigid and flexible PVC pelletizing.
The TP115-26 provides outputs up to 910kg/h for rigid PVC pipe/sheet, 725kg/h for profiles, 825kg/h for siding, and 1000kg/h for flexible PVC pelletizing.
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Maximum output for the largest model (TP172-26) ranges from 1800kg/h for rigid PVC profile to 2275kg/h for rigid PVC pipe and siding.
Unitized construction mounts all components on a single base for fast, easy installation and space-saving compactness.
A narrow footprint enables more production per square meter of floor space.
The TP115-26 is only 1400mm (55.1in) wide by 5650mm long and 2825mm high with starve feeder and hopper.
Even the largest machine, the TP172-26, has a footprint of 8247 x 1758 x 2873mm (L x W x H), without entry adapter.
Subcomponents mounted on slide-out trays enable easy maintenance.
* 'Best-in-class' capabilities - the TP line is designed for best-in-class torque and efficiency at working the raw material to provide unmatched processing consistency and throughput range.
State-of-art screw design provides superior surface area for gentle plastification of the material.
This optimizes heat transmission efficiency to the feedstock over the full length of the screws, while optimizing the compression ratio for longer screw and barrel life.
A variety of different feeding devices, include Gravimetric, Crammer and Doser Feeders, ensures complete flooding of the screws for proper filling of the screw channels.
A co-rotating twin-screw preheating feeder system known as the Material Enhancement Delivery System (MEDS) is also available for more difficult materials.
An Eisenbeiss Torque Master gearbox - standard on all TP machines - provides superior torque and thrust capability compared to competitive gearbox technology available on the market today.
The gearbox contains both reduction and distribution gearing in an integral housing.
The four-shaft Torque Master design is exceptionally quiet, with the gearing system delivering long bearing life and up to 96,130 Nm of maximum available torque in the largest extruder size.
* Optimized heating and cooling - precision control of process heating and cooling assures highly consistent and efficient extrusion performance.
TP extruders produce a homogeneous melt temperature with pulse-free, positive-displacement pumping making them ideal for quality extrusion of vinyl and similar heat- and shear-sensitive materials with a wide processing window and high output rates.
Increased energy efficiency is achieved by proper filling of the screws and applying an optimum balance of mechanical work and external heat energy to the material.
For degassing, single or dual vent zones are provided depending on L/D and application, and a liquid-ring vacuum pump produces optimal air evacuation while reducing overall maintenance.
A high-efficiency electric heating/water cooling system provides temperature control to the barrel zones.
This design provides superior cooling properties and is nearly maintenance-free compared to oil-cooled systems.
An active oil system with an individual temperature control zone and heat capacity of 9-18kW (depending on model) is standard.
Screw temperature control via sealed, close-loop water is available as an option for the screws.
Eight die zones (including entry adapter) are standard, and up to 18 are available.
TP extruders come standard with the Cincinnati Milacron/Mosaic touch-screen control with 15in LCD screen, self-diagnostics, and Ethernet TCP/IP connectivity.
Proven Milacron software provides full production control, including slaved co-extruder speed control, SPC monitoring and analysis, process alarms, and process 'recipe' storage and call-up.
Operators are provided with on-screen control panels, instant-access information screens with full-color graphics, and multi-language capability.
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