After the waste plastic is washed and dried, it is generally granulated according to the characteristics of the resin and the molding conditions before the molding process.
The granulation process is divided into two categories: cold-cut granulation and hot-cut granulation. Generally, the granulation process of different plastic cultivars is different, but the same plastics will also adopt different granulation processes due to different molding equipment and processes. .
1. The cold-cut granulation melt of the flakes and strands is taken from the plasticizing equipment (for example, a two-roll mill) or a strand (such as an extruder). After cooling by the cooling water tank, after passing through the dewatering roller, it is fed into the pelletizer by a pulling roller at a certain speed. The pulling speed of the strip does not exceed 60-70 m/min, the number of strips does not exceed 40, and the cross-sectional size of the pellets The length and length are determined by the traction speed and the feed speed. Granulation quality, surface quality, gloss, color, and air bubbles can be continuously tested on the wire. The advantage of this process is that the operation is simple, the pellets do not stick to each other, and the disadvantage is that a relatively large space is required.
| Granulation method | Production (kg/h) | Applicable materials | Pellet diameter (mm) | Length (mm) | Pellet shape | main feature |
| Cold cut granulated sheet | 5~1000 | PE, PP, ABS, PVC, PA and others | 1~6 | 1~6 | Cube | Easy to start, poor shape of the cut, poor flow of pellets |
| Wire material | 5~1000 | PE, PP, ABS, PS, PA and others | 1~6 | 1~6 | Cylinder | Applicable to a variety of resins, large output, no need for post-drying, air cooling |
| Hot cutting granulation center pelletizing air cooling | 20~100 | PE, PP, etc. | 4~6 | 1~2.5 | Cylinder | Simple operation, good particle shape, small pelletizing power, limited to PVC or high viscosity material extrusion |
| Center pelletized water cooling | 20~600 | PE, etc. | 2.5~6 | 1~3 | Go-like cylinder | It is easy to weld the pellets, the operation is simple, the operating environment is good, and it can be mass produced. |
| Eccentric pelletizing water cooling | 20~3000 | PE, etc. | 2~6 | 1~3 | Go-like cylinder | Small head, high output, relatively large cutter |
| Milling tooth ring cutter | 10~1000 | PP, PE, ABS, PVC, PS, etc. | 1.5~6 | 1~3 | Go-like cylinder | Almost suitable for granulation of all thermoplastics |
| Water ring cutting | 500~5000 | Almost all thermoplastics | 1.5~6 | 1~3 | Go game sphere | Suitable for high-volume applications, suitable for all thermoplastic materials |
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