What are the benefits of installing melt pumps in extrusion lines?

With the development of the plastics industry, end-customer requirements for product quality continue to improve, so the melt pump in the current extrusion process shows an increasingly important role; especially in the production of high-quality products such as plates and sheets, tubes, bi-directional stretch film, fiber optic cables and other products in the field of indispensable.

1, for you to improve the stability of product size.

By the role of the screw movement mechanism within the extruder, generally in the head of the melt pressure is usually characterized by pulse-type fluctuations. This fluctuation cannot be eliminated by the PID regulation itself and can be 5 to 20 bar (1 bar = 100,000 Pa). If a melt pump for plastic extrusion is installed at the rear of the head, the continuous engagement of the teeth and the involute helical tooth technology used in the extrusion pump increase the tooth engagement, resulting in a continuous and smooth extrusion of the material to eliminate pressure fluctuations.

For subsequent processes, it is important to ensure a smooth flow of material and to minimize fluctuations in melt pressure in order to ensure more consistent product dimensions. The smaller the fluctuations in melt pressure, the more uniform the thickness of the tubes and sheets, and in the case of fiber optic cables, the more controlled the dimensions.

polymer melt pump

Stable product dimensions not only significantly improve product quality and reduce the defective rate of finished products, but more importantly, save raw material consumption. According to analysis, after the use of melt pumps, depending on the material properties of different materials and processes, can obtain different degrees of raw material savings, according to statistics, after the use of melt pumps, an average of 2 to 8% of raw materials can be saved.

2、Improve your extrusion output.

When the extruder runs for several years, the screw and barrel inside the extruder will produce a lot of wear and tear, resulting in increased clearance. In this case, the amount of returned melt increases as the head pressure in production increases. The result is a drop in production relative to a new screw cullet. At this time, if you install a melt pump extruder, you can make this problem improved.

3, for you to reduce energy consumption.

Usually, the melt pump can help to complete the task of generating pressure, which allows the extruder can "concentrate" on feeding, melting, mixing work. Without a melt pump, high pressures are generated at the head of the extruder. With the installation of a melt pump, the high point of pressure is at the back of the pump and not at the front of the pump, which reduces the pressure inside the extruder. Since the extruder does not have to generate high pressure, the shear strength of the corresponding melt decreases, the temperature profile flattens out and the temperature rise decreases. From the extruder's torque considerations, this will reduce energy consumption.

pump melt gear pump for plastic extruder

4、Save your raw material consumption.

In mass production, it is often necessary to start and stop the machine. Generally after each start-up, it usually takes a long time for the melt pressure and related parameters to reach normal and stable values, which means a long discharge period. If a melt pump is installed in the extruder, the melt parameters can be stabilized quickly, thus reducing the discharge time and saving raw materials. Similarly, the use of masterbatches in the production of the case, the product color change often takes a long time after the installation of melt pumps, significantly reducing the time of the discharge of waste materials.

With the improvement of the overall technical level of the plastics processing industry, as well as the rise in the price of international plastic raw materials, people pay more attention to the details of plastic and rubber processing. Fierce competition requires continuous improvement of product quality and reduce product costs, for this reason, melt pumps will be widely used in various types of extrusion process.

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