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What should be noted when operating a plastic pelletizing machine?

Time：

2019-07-19

The extrusion system comprises the screw, barrel, hopper, die head, and mold. Through 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) Screw: This is the primary component of the extruder, directly determining its application range and production capacity; it is manufactured from high‑strength, corrosion‑resistant alloy steel. (2) Barrel: A metallic cylindrical sleeve, typically made of heat‑resistant, high‑pressure‑rated, robust, wear‑resistant, and corrosion‑resistant alloy steel, or of composite steel tubing with an alloy‑steel liner. The barrel works in conjunction with the screw to achieve crushing, melting, plasticization, degassing, and compaction of the plastic, and…

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 primary 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 metallic cylindrical component, typically manufactured from heat‑resistant, high‑pressure‑strength, robust, 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, melt, plasticize, degas, and compact the plastic, while continuously and uniformly conveying the molten material to the molding system. Generally, the barrel’s length is 15 to 30 times its diameter, with the aim of ensuring 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) The Die Head and Mold: The die head consists of an alloy‑steel inner sleeve and a carbon‑steel outer jacket, with a forming mold installed inside. Its function is to convert the rotational motion of the plastic melt into a uniform, straight‑line flow, guide it smoothly and evenly into the die sleeve, and impart the necessary molding pressure. Within the barrel, the plastic is plasticized and compacted; it then passes through a porous filter plate and the die neck into the die’s forming mold. The core and sleeve are properly matched to create an annular gap whose cross‑section continuously decreases, allowing the molten plastic to form a continuous, dense tubular sheath around the core wire. To ensure an optimal flow path within the die head 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 provided. The die head is also equipped with mechanisms for mold alignment and adjustment, facilitating precise centering of the core and sleeve.

The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite stone‑plastic production lines, silicone stone‑plastic production lines, plastic weatherstripping production lines, plastic pelletizing machines, plastic profile production lines, plastic pipe production lines, elastomer extruders, and other extrusion equipment, as well as manufacturing equipment for engineering seals, automotive seals, wire and cable components, air‑conditioning hoses, braided hoses, automotive fuel lines, waterstop strips, and related products.