MACHINERY | ALTERNATIVE COMPOUNDERS
are custom-made to meet the demands and the specifications of the customer. In the multi-screw series, says Lai, the WDR MFU
KZW ZRO series can compound a wide range of raw materials, ranging from general-purpose resin through super engineering plastics to fluoropoly- mers. The company can configure the units for applications ranging from new materials develop- ment to recycling and reactive extrusion. “In general, the task of compounding using a
Above: The L-WE 30 laboratory extruder from Entex is supplied
complete with dosing and heating/
cooling units
extruder has an output of between 0.5 and 10 kg/h (compared to around 8 tonnes/h for the company’s largest TP-WE 400 machine). Both, however, are built using the same modular approach, which allows for spindles of various designs to be used in the planetary sections. There are three cylinder assemblies (one planetary feeding cylinder and two others), with six standard planetary spindles per cylinder rotating around a central spindle. Modularity extends to the plug-and-play heating and cooling units, which fit under the processing system support table and provide highly precise temperature control.
Right: Technovel’s testing lab has four-axis and eight-axis kneading and compounding extruders. Unusally, the screws are arranged side-by-side
Side-by-side Japanese equipment company Technovel has a stable of extrusion systems that go from single-screw, through twin-screw (co-and counter- rotating), to quad and octa-screw units. In all cases, the screws are arranged side-by-side, rather than in a circle. Screw diameters start at 5mm and go up to 134mm. Francis Lai, who works out of the company’s newly opened US sales operation in Boston in Massachussetts in the US says all products
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twin-screw extruder is challenging to improve the kneading and compounding performance, especially in reducing the self-heating, the resi- dence time, the size of equipment, the L/D, and the torque,” Lai says. “Our WDR fully meshed, co-rotating parallel quad-axis and octa-axis compounding extruder series is based on our experiences and know-how and verified by the process data of the fully meshed co-rotating twin-screws compounding extruder accumulated over many years,” he says. The company claims the WDR series is the first to exceed the performance of a high L/D, high rotational speed, and high torque density twin- screw extruder.
Lai says quad- and octa-screw compounding
units reduce shear heating and significantly extend the residence time. They can also
PHOTO: ENTEX
PHOTO: TECHNOVEL
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