Boarding and alighting

The pelletizing unit consists of On the computer Granulator and Off-machine granulator Skillful coordination. Thin films, fibers, and other materials are directly fed into the extruder after being rapidly shredded into pellets. Depending on the material, the pre‑pelletizing extrusion recycling pelletizing unit can be equipped with either a short‑length screw or an vented extruder. The low melt temperature effectively minimizes further thermal degradation of the material.

Series The PVC/PE/PS pelletizing unit is composed of Granulator A complete set comprising the corresponding granulator. Granulator . Primarily used for production PVC and various other plastic pellets are produced with uniform, dense, and aesthetically pleasing particles. The series of PVC/PE/PS pelletizing units feature excellent plasticization, high production efficiency, a compact overall machine structure, and a high degree of automation.

1. Extrusion System The extrusion system comprises the screw, barrel, hopper, die head, and mold. Within this system, the plastic is plasticized into a uniform melt and, under the pressure generated during the process, is continuously forced through the die head by the screw.
( 1) The screw is the most critical component of an extruder; it directly determines the machine’s application scope and production capacity, and is manufactured from high-strength, corrosion-resistant alloy steel.
( 2) Barrel: A metal cylindrical component, typically manufactured from heat‑resistant, high‑pressure‑strength, wear‑resistant, and corrosion‑resistant alloy steel, or from a composite steel pipe with an alloy‑steel liner. The barrel works in conjunction with the screw to crush, soften, melt, plasticize, degas, and compact the plastic, while continuously and uniformly feeding the molten material into the molding system. Generally, the barrel’s length is 15 to 30 times its diameter, designed to ensure thorough heating and complete plasticization of the polymer.
( 3) Hopper: The bottom of the hopper is equipped with a shut-off device for adjusting and stopping the material flow, while the side of the hopper features an inspection port and a calibrated metering device.
( 4) Die Head and Mold: The die head consists of an alloy steel inner sleeve and a carbon steel outer shell, with the following components installed inside the die head: Molding die The die head serves to convert the rotational motion of the molten plastic into a uniform, straight-line flow, guiding it smoothly and evenly into the die sleeve while imparting the necessary molding pressure. Within the barrel, the plastic is plasticized and compacted; it then passes through a porous filter plate and along designated flow channels via the die neck into the die‑forming mold. The core and die sleeve are properly matched to create an annular gap whose cross‑section continuously decreases, thereby forming a continuous, dense tubular sheath around the core wire. To ensure a well‑designed internal flow path and eliminate dead zones where plastic might accumulate, a分流套筒 (flow‑diverting sleeve) is often installed. Additionally, to mitigate pressure fluctuations during extrusion, a pressure‑equalizing ring may be incorporated. The die head is also equipped with mechanisms for mold alignment and adjustment, facilitating precise centering of the core and die sleeve.

Extruders are classified according to the angle between the die flow direction and the screw’s central axis, with dies further categorized into angled dies (angle… 120°) and a right-angle head. The head housing is bolted to the machine body, and the die inside the head features a die‑core holder that is secured at the cable‑entry port with a nut. A die core is mounted on the front of the die‑core holder, and both the die core and its holder have central holes for passing the conductor core. A pressure‑balancing ring is installed at the front of the head to equalize pressure. The extrusion‑molding section consists of a die‑holder and a die sleeve; the position of the die sleeve can be adjusted via bolts and supports, allowing precise control of its relative alignment with the die core and facilitating uniformity in the thickness of the extruded coating. External heating and temperature‑measurement devices are also provided.
2. Drive System The drive system is responsible for driving the screw and providing the torque and rotational speed required during the extrusion process; it typically consists of an electric motor, a reducer, and bearings.

3. Heating and Cooling System Heating and cooling are essential prerequisites for the plastic extrusion process to proceed.