Recycled plastic granulation technology

After the waste plastics have been cleaned and dried, the pellets are generally granulated according to the characteristics of the resin and the molding conditions before forming.

The granulation process can be divided into two major categories: cold-cut granulation and hot-cut granulation. Generally, the granulation process of different plastic varieties is not the same, but the same kind of plastic will also use different granulation processes because of different molding equipment and processes. .

1. Cold cut granulation of sheet and strands The melt is withdrawn from the plasticizing equipment (for example, a two-roll mill) or a strand (for example, an extruder). Cooling water tank cooling, after the dehydration roller, with the traction roller into the pelletizer at a certain speed, the material traction speed does not exceed 60 to 70m/min, the number of bars does not exceed 40, the size of the pellets The length is determined by the pulling speed and feed speed. The quality, surface quality, gloss, color, and air bubbles of the granulation can be continuously tested on the online material. The advantage of this process is that the operation is simple and the pellets do not stick to each other. The disadvantage is that relatively large space is required.

Pelleting Method Yield (kg/h) Applicable Material Pellet Diameter (mm) Length (mm) Pellet Shape Main Features Cold Cut Granulation Sheet 5~1000 PE, PP, ABS, PVC, PA and others 1~6 1 ~6 cubes are easy to start, bad incision shape, poor flowability of pellets 5 ~ 1000 PE, PP, ABS, PS, PA and other 1 ~ 6 1 ~ 6 cylinder for a variety of resins, large output, no post-drying ,Air-cooling hot-cut pelletizing center pelletizing air-cooled 20~100 PE,PP etc. 4~6 1~2.5 Cylinders are easy to operate, good particle shape, small pelleting power, limited to PVC or high viscosity material extrusion center cut Granular water-cooled 20~600 PE and other 2.5~6 1~3 gogo-shaped cylinders are prone to splicing of pellets. The operation is simple, the operation environment is good, and mass production of eccentric pellet water cooling 20~3000 PE, etc. 2~6 1~3 The chess piece cylinder head is small, the yield is high, the cutter is relatively large, the milling tooth ring cutter is 10~1000 PP, PE, ABS, PVC, PS etc. 1.5~6 1~3 Go chess cylinder is almost suitable Granulated water ring pellets for all thermoplastics 500 to 5000 Almost all thermoplastics 1.5~6 1~3 Go pellets for high volume applications, suitable for all thermoplastic materials