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Applications of Pin-Rod Rubber Extruders

Time：

2021-09-07

Cold-feed rubber extruders are widely used in China’s rubber industry. In pin‑type rubber tube extruders, the pins are inserted directly into annular grooves; under their action, the rubber compound undergoes lateral movement, flow, and rotational motion. The combined effect of these three motions effectively breaks up the core that forms during extrusion. Each time this core passes over a pin, it experiences shear; with each revolution of the screw, the compound is repeatedly divided and sheared by multiple pins, enhancing kneading and accelerating its flow within the screw’s flight grooves, thereby producing high‑quality mixed, kneaded, and plasticized rubber compounds. Thanks to the insertion of pins, mixing, kneading, and plasticization capabilities are significantly improved. Under identical extrusion conditions, the working length of the screw can be shortened by 2–4 times compared with conventional cold‑feed extruders. With a reduced length‑to‑diameter ratio, the residence time of the material inside the barrel is decreased. Almost all rubber extruders now employ pin‑type cold‑feed designs. In bias‑ply tire production, replacing hot‑feed extruders with pin‑type cold‑feed extruders has become a prevailing trend, rapidly gaining momentum. Applications such as tread compound extrusion, various triangular rubbers, and extrusion of different types of rubber have led many manufacturers to adopt pin‑type cold‑feed extruders. Similarly, in hose manufacturing, both inner‑rubber and outer‑rubber extrusions also utilize pin‑type cold‑feed rubber extruders. The rubber hose extruders manufactured by Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. feature a cold‑feed system with non‑leaking feed rollers, coupled with a Changzhou hardened‑gear reducer that drives the feeding mechanism to precisely control the amount of rubber fed, minimizing damage caused by material leakage from multi‑barrel screws and extending equipment lifespan. Pin‑type rubber extruders not only incorporate substantial improvements in screw design but, thanks to the addition of pins on the barrel, also deliver markedly enhanced plasticizing performance, greater compactness of extruded products, and higher extrusion output. Moreover, they operate at lower discharge temperatures, meeting the extrusion requirements of diverse production processes. Concurrently, the optimized screw structure reduces drive power, resulting in a significant decrease in specific energy consumption. Owing to their excellent plasticizing ability, low discharge temperature, and high extrusion capacity, these extruders are enjoying increasingly widespread adoption across the rubber industry.

Cold-feed rubber extruders are widely used in China’s rubber industry. In pin‑type rubber hose extruders, the pins are inserted directly into annular grooves; under their action, the rubber compound undergoes lateral movement, flow, and rotational motion. The combined effect of these three motions effectively disrupts the core that forms during extrusion. Each time this core passes over a pin, it experiences shear; with each revolution of the screw, the compound is repeatedly divided and sheared by multiple pins, enhancing kneading and accelerating its flow within the screw’s flight grooves. As a result, high‑quality mixing, kneading, and plasticization of the rubber compound can be achieved.

Thanks to the incorporation of pin elements, the mixing, kneading, and plasticizing capabilities are enhanced. Under identical extrusion conditions, the working length of the screw can be shortened by 2D–4 compared with that of a conventional cold-feed extruder; moreover, the reduced L/D ratio leads to a shorter residence time of the material within the barrel. Virtually all rubber extruders used for producing compounded rubber compounds now employ pin‑type cold‑feed extruders. In bias‑ply tire manufacturing, the replacement of hot‑feed extruders with pin‑type cold‑feed extruders has become an overwhelming trend in recent years, with rapid adoption—particularly for tread‑compound extrusion, various bead‑cementing compounds, and the extrusion of diverse rubber grades—leading many manufacturers to adopt this technology. Similarly, in hose production, both inner‑rubber and outer‑rubber extrusion are carried out using pin‑type cold‑feed rubber extruders.

The rubber hose extruders manufactured by Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. employ a cold-feed system with non‑leaking feed rollers, coupled with Chongqing hard‑toothed surface reducers and gear‑driven feeding mechanisms to precisely control the amount of material fed, thereby minimizing damage caused by material leakage from multi‑barrel screws and extending equipment service life. The pin‑type rubber extruder not only features significant improvements in screw design but also incorporates pins on the barrel, greatly enhancing plasticization performance, product density, and extrusion output. Additionally, it operates at lower discharge temperatures, meeting the extrusion requirements of various production processes. The optimized screw design further reduces drive power, resulting in a marked decrease in specific energy consumption. Owing to its excellent plasticization, low discharge temperature, and high extrusion capacity, this type of extruder is increasingly widely used in the rubber industry.