The air‑cooled die‑face pelletizer is primarily used for granulating materials that are either highly hygroscopic or difficult to dry, as well as those whose moisture content can adversely affect product quality. Since the material remains free of moisture contact throughout the entire granulation process, the dehydration and drying steps are eliminated, thereby preventing secondary contamination from cooling water. Pellets produced by hot die‑face cutting exhibit a smooth, rounded, and aesthetically pleasing appearance.

The standard configuration of an air‑cooled die‑face pelletizing machine includes the pelletizer, an air‑conveying system, and a vibrating screen. Thanks to its modular design, users can also customize the system—such as by adding air conveyance or a fluidized‑bed cooling unit—to meet specific process requirements.

Depending on the screw design and mechanical configuration, it can be used for pelletizing sheet or granular materials such as PVC, PP, PE, PS, PET, ABS, PC, and acrylic. It is suitable for processing both virgin and recycled resins. The pelletizer boasts excellent processability, low manufacturing costs, corrosion resistance, high pellet‑cutting precision, efficient hot‑cutting, and easy installation and mobility. The master–slave unit features secondary filtration and superior venting, producing pellets that are dense, brightly colored, and well plasticized.

Plastic pelletizing machines are now widely used. In the waste‑plastic industry, discarded plastics once posed a significant environmental threat; however, since the advent of pelletizing equipment, pollution has been greatly reduced. The use of waste‑plastic pelletizers not only mitigates environmental harm but also enables many types of used plastics to be recycled and reused.

The main unit of a plastic pelletizing machine is the extruder, which consists of an extrusion system, a drive system, and a heating–cooling system. Vigorously developing renewable resources can turn waste into valuable materials. Extruders are classified into angled-head and straight‑head types based on the angle between the material flow direction at the die head and the screw’s central axis. The die head housing is bolted to the machine body, and inside the head, the die assembly includes a die‑core holder secured with nuts at the feed end; a die core is mounted in front of the holder, with a central hole through both the core and its holder to accommodate the core wire. A pressure‑equalizing ring is installed at the front of the die head to balance internal pressure. The extrusion‑coating section comprises a die‑holder and a die sleeve; the position of the die sleeve can be adjusted via bolts and supports, allowing precise control over its relative alignment with the die core and facilitating uniformity in the thickness of the extruded coating layer. External heating and temperature‑sensing devices are also provided.

Maintenance methods for plastic pelletizing machines:

1. The plastic pelletizing machine should be installed in a well-ventilated location to dissipate the heat generated during operation and extend its service life.

2. Bearings should be regularly lubricated to ensure good lubrication between the bearing components.

3. Regularly inspect the tool fasteners: after the new plastic pelletizing machine has been in operation for one hour, use tools to tighten the screws on the moving and stationary blades, ensuring secure fixation between the blades and the blade holder.

4. To maintain the sharpness of the cutting edge, regularly inspect the tool to ensure its sharpness and minimize damage to other components caused by a dull or chipped blade.

5. Before the second start-up, any residual debris in the machine room should be removed to reduce starting resistance.

6. The inertia cover and pulley cover should be opened regularly, and the ash discharge port beneath the flange should be cleaned, as powdered material discharged from the plastic pelletizing chamber can enter the spindle bearings.

7. The waste plastic pelletizing machine shall be properly grounded.

Hebei Shuangda Rubber and Plastics Machinery Co., Ltd. is a modern enterprise integrating research and development, manufacturing, and sales of complete sets of extrusion equipment for rubber, silicone, and plastics. The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite sealing strip extrusion lines, silicone sealing strip production lines, plastic sealing strip production lines, plastic profile production lines, plastic pipe production lines, elastomer extruders, and other extrusion equipment, as well as production machinery for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.