The Importance of Temperature Control in Rubber Extruders
Time：
2020-02-24
Typically, hot‑feed extruders use an open mill for hot mixing and feeding, with the rubber compound already at a relatively high temperature and well‑plasticized. Consequently, the primary function of a hot‑feed extruder is to further raise the temperature and degree of plasticization of the feedstock while enabling continuous extrusion and shaping. In the barrel–screw system of such an extruder, the physical state of the rubber compound remains largely unchanged; moreover, different types of compounds can meet specific feeding requirements by adjusting the duration and conditions of the open‑mill mixing process. As a result, precise temperature control is not a stringent requirement in these extruders, which is why temperature‑control devices are seldom employed. However…
Typically, hot-feed extruders use an open mill to heat and plasticize the rubber feedstock, resulting in a material that already exhibits a high temperature and a high degree of plasticization. Consequently, the primary function of a hot-feed extruder is to further raise the temperature and plasticization level of the incoming rubber compound while enabling continuous extrusion and shaping.
In the barrel–screw system of a hot-feed extruder, the state of the rubber compound remains essentially unchanged. Moreover, different types of compounds can meet the feeding requirements by carefully controlling the mixing time and conditions in an open mill. Consequently, temperature control is not particularly stringent in hot-feed extruders, which is why such machines rarely incorporate temperature‑control devices.
However, the situation with cold-feed extruders is quite different: the feedstock is both cold and rigid, and a variety of such cold, hard compounds must meet their extrusion process requirements entirely within the cold-feed extruder itself. The transition from cold to hot, from rigid to soft, and from non‑uniform to uniform conditions involves distinct stages, each of which influences the others. With all other operating parameters held constant, the temperature profile along the extruder’s zones plays a decisive role in the extrusion process. If the temperatures in these zones vary, the extrusion rate, extrusion temperature, and expansion ratio will all change, destabilizing the extrusion operation and severely compromising the quality of the semi‑finished product.
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Shuangda
Hebei Shuangda Rubber Machinery Co., Ltd.
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