The filling and sealing machine smoothly and accurately injects various paste-like, cream-like, and high-viscosity materials into tubes, while also performing in-tube hot-air heating, sealing, and applying batch numbers and production dates. It is ideal for large-diameter plastic and composite tubes used in industries such as pharmaceuticals, food, cosmetics, and daily chemical products.
Filling and Sealing Machine It is determined by multiple parameters, making it impossible to describe a filling and sealing machine using just a single one. Axial power (P), impeller discharge rate (Q), head pressure (H), impeller diameter (D), and filling speed (N) are the five fundamental parameters that characterize a filling and sealing machine.
The discharge volume of the impeller is directly proportional to the impeller's own flow coefficient, the first power of the impeller speed, and the cube of the impeller diameter. Meanwhile, the shaft power consumed during filling is proportional to the fluid density, the impeller's power coefficient, the cube of the rotational speed, and the fifth power of the impeller diameter.
Under fixed power conditions and with a specific impeller design, both the impeller discharge rate (Q) and the head (H) can be adjusted by carefully matching the impeller diameter (D) and rotational speed (N). For instance, using a large-diameter impeller at low speed—while keeping the shaft power constant—will result in stronger flow action but lower head pressure. Conversely, pairing a small-diameter impeller with high speed will generate higher head pressure but reduce the overall flow effect.
In the filling tank, the only way to ensure that micro-aggregates collide with each other is to provide sufficient shear rate. From the perspective of the filling and sealing mechanism, it’s precisely the difference in fluid velocities that causes the layers of fluid to mix dynamically. Therefore, any filling process inherently involves fluid shear rates—lhhaha620. Shear stress, as a force, is the real driving factor behind phenomena such as bubble dispersion and droplet breakup in filling applications. It’s important to note, however, that the shear rate varies significantly at different points throughout the entire mixing tank.
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Experimental studies have shown that, for the impeller zone, regardless of the impeller type, both the maximum and average shear rates increase with rising rotational speed when the impeller diameter remains constant. However, at a fixed rotational speed, the relationship between shear rates—both maximum and average—and impeller diameter varies depending on the impeller design. Specifically, under constant speed conditions, the maximum shear rate for radial-type impellers increases as the impeller diameter grows, while the average shear rate remains independent of impeller diameter.
These insights into shear rates within the impeller zone must be carefully considered during the scale-down and scale-up design of filling and sealing machines. Typically, small-scale machines feature higher rotational speeds (N), smaller impeller diameters (D), and lower tip speeds (ND) compared to their larger counterparts, whereas large-scale machines tend to operate at lower speeds (N), with larger impeller diameters (D) and significantly higher tip speeds (ND).
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