Function
Description of function
The melt coming from the extruder via a melt filter (1) is distributed along the width of the strand die (2) by the strand die body and discharged through circular bores.
The cooling of the strands is a fundamental step in the process which has a decisive effect on the quality of the pellets. For this reason the water chute (3) can be adjusted horizontally and vertically which means that it is possible to optimise strand cooling and strand intake into the pelletiser even during production.
The laminar water film flow in the chute (which is additionally supported by manually adjustable spray nozzles) prevents the strands from sticking together and also prevents warm water jacket from forming around them.
Besides cooling the strands the laminar water flow in the chute also has the job of refeeding any torn or interrupted strands to the strand pelletiser fully automatically and without any external operator intervention. This means that strand interruptions coming from the strand die (e.g. as a result of gas bubbles) have no negative effect on the system.
The strands are cooled down in the chute to such an extent that on the one hand they are cold enough to not become deformed in the subsequent pelletising process, but on the other hand still have sufficient internal core heat to effectively support the drying off of any residual moisture during the subsequent downstream process.
Semi-submerged strand pelletiser (4)
High strand haul-off speeds, long service life of the cutting elements and the removal of fines by the cooling water are the outstanding features of the pelletiser system with wet cutting. Thanks to its sturdy, vibration-resistant frame and a pivoting noise protection cover the compact pelletiser ensures only minor noise emission. Excellent accessibility to the interior enables fast maintenance plus simple and rapid cleaning when changing over products.
