Vented Extruders
A vented extruder is an extruder that contains a vent, which is used to extract volatiles from a plastic material during the extrusion process. The water (moisture) and volatiles content in a plastic material may be reduced to acceptable levels by the use of a vented machine. Part of the way along the extrusion barrel the melt is decompressed by reducing the screw root diameter. A vent, through which the vapor escapes, is located at this point in the barrel (the vent may be plugged and not used when venting is not required). The vapor-free melt is then conveyed towards the die and re-compressed by increasing the screw root diameter.
To ensure that melt does not escape through the vent, a dam or torpedo section is incorporated on the screw just before the vent. Because of the way that vented machines are constructed (a high L/D ratio and a variable screw geometry) and operated, it has been found that they produce very good mixing. It should be remembered, however, that pre-drying of the polymer may be more appropriate, since heating some plastics in contact with water may cause their decomposition, or degradation.
We ‘Superplast Machines India’, are a renowned organization which is involved in manufacturing and supplying of a quality assured the range of Vented Extruders which are fabricated by our professionals using the optimum quality raw material. These machines and plants conform their adherence with the international quality standards. Owing to the features like robust construction, low maintenance cost, easy operations and efficient performance, our vented extruders are widely appreciated by the patrons. Moreover, before the final delivery, all our machines and plants are strictly examined by a team of quality inspectors on varied parameters to ensure their flawlessness.