The patented extruder system INTAREMA® TVEplus® sets new standards in the recycling of materials that are difficult to process such as heavily printed films and/or very moist materials. This is made possible through ultrafine filtration, thorough melt homogenisation and high-performance degassing in a single step.
The proven basic principle of TVEplus® technology: melt filtration takes place upstream of extruder degassing. As a result, end products can be produced with the best quality and the highest possible recyclate content.
Feeding (1) is automatic according to customer requirements. In the Preconditioning Unit (2) the material is cut, mixed, heated, dried, pre-compacted and buffered. Next, the tangentially connected extruder is filled continuously with hot, pre-compacted material. The innovative Counter Current technology enables optimised intake action across an extended temperature range.
In the extruder screw (3) the material is plasticised and degassed in reverse. At the end of the plasticising zone the melt is directed out of the extruder, cleaned in the fully automatic, self-cleaning filter (4) and returned to the extruder again. The final homogenisation of the melt (5) takes place after the melt filter. In the subsequent degassing zone (6) the filtered and homogenised material is degassed. Following this, and with the help of the discharge zone (7), the melt is conveyed to the respective tool (8) (e.g. pelletiser) at extremely low pressure.
The melting procedure takes place with minimum shearing effect. This prevents any further size reduction of disturbing contaminants prior to filtration and enhances filtration efficiency.
A comparison test with washed post-consumer films (film sample with 100% recyclate), filtered with the EREMA laser filter (110 µm), confirms this increased filtration performance thanks to minimal shearing.
Counter Current technology developed by EREMA changes the direction of rotation inside the preconditioning unit: the plastic material thus moves in the opposite direction to that of the extruder screw. A small change with a big impact: the relative speed of the material in the intake zone, i.e. when passing from the preconditioning unit to the extruder, accelerates so that the extruder acts in the same way as a sharp cutting edge which literally "slices up" the plastic.
As a result the extruder handles more material in a shorter time. Thanks to the enhanced material intake plastic can be processed even at lower temperatures at a high throughput - meaning higher productivity, flexibility and operational reliability
Counter Current technology
Smart Start technology