Production capacity of plastic extruders
Time：
2018-04-08
In the process of extruding various plastic products, the plastic extruder is indispensable. Some customers ask: what is the hourly or daily output of a plastic extruder? As the name suggests, this refers to how much plastic product the extruder can produce. In fact, the extruder’s output depends on three main factors: the machine’s size and specifications, its power rating, and the design of its barrel and screw. Below, we will provide a detailed explanation. The relationship between production capacity and the screw speed of a plastic extruder is as follows: as the screw speed increases, production capacity rises; however, if the screw speed becomes too high, the increase in production capacity…
In the process of extruding various plastic products, the plastic extruder is indispensable. Some customers ask: what is the hourly or daily output of a plastic extruder? As the name suggests, this refers to how much plastic product the extruder can produce. In fact, the extruder’s output depends on three main factors: the machine’s size and specifications, its power rating, and the design of its barrel and screw. Below, we will provide a detailed explanation.
The relationship between production capacity and the screw speed of a plastic extruder is such that, as screw speed increases, production capacity rises; however, when the screw speed becomes excessively high, the increase in production capacity diminishes, and the polymer melt is prone to scorching. The relationship between power consumption and screw speed is that power also increases with rising screw speed, though the rate of this increase gradually declines as screw speed continues to rise. With respect to die pressure, it increases as screw speed rises. Regarding the interaction between the polymer melt and the barrel: screw speed influences the shear, kneading, plasticization, and temperature rise of the material within the barrel. As for the drive system, its relationship with screw speed is as follows: lower screw speeds necessitate a higher reduction ratio in the drive system, which in turn complicates the overall design of the drive mechanism.
The inner surface of the plastic extruder barrel has a higher hardness than that of the extruder screw, so it tends to wear out later. The barrel is considered scrapped when its internal diameter increases due to prolonged wear. If the barrel has an nitrided layer, the worn‑out bore can be directly re‑bored and lapped to a new diameter, after which a new extruder screw can be machined to match that diameter.
The inner diameter of the plastic extruder barrel is machined and re‑cast with an alloy, with a wall thickness of 1–2 mm, followed by precision finishing to the required dimensions. In general, the homogenization section of the extruder barrel wears relatively quickly; this segment—typically 5–7 times the screw diameter in length—can be reground by boring, after which a nitrided alloy steel liner is fitted. The inner bore diameter of the extruder barrel is matched to the screw diameter, while maintaining the standard clearance between the barrel and the screw during machining and assembly.
Dear customers, both new and existing, after reading this article, do you now know how to choose the right extruder? We’re confident that when selecting an extruder, every customer seeks a machine with high productivity and excellent stability. If that’s what you’re looking for, feel free to inquire about Shuangda’s equipment—please call Manager Jiang at 13463938789.
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Hebei Shuangda Rubber Machinery Co., Ltd.
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Landline：+86-319-6017632
Email：shuangdaxiangsu@126.com
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