How Does A Twin-screw Extruder Improve Production Efficiency And Product Quality?

As the manufacturing and processing technology of the twin-screw extruder is getting better and better, it is not only necessary to perform tasks such as feeding and plasticizing, but also to perform dehydration, drying and other technologies. In order to better meet the different needs of users, the double-screw extruder Screw extruders must continue to improve their work efficiency, but also need to find ways to improve the product quality of the manufactured products, so what should we do? Next,kelongweier will briefly explain to everyone.

How to improve the work efficiency of the twin screw extruder:

Improving work efficiency is one of the most important goals in the development, design, and development of the new co-rotating twin-screw extruder. It can also be accomplished by increasing the screw speed, increasing the plasticization and mixing level, and so on. Under the same screw speed, expanding the depth of the screw groove can greatly increase the conveying capacity. In contrast, the plasticization and mixing level of the screw must also be expanded, which requires the screw to withstand higher torque. At a high screw speed, the residence time of the material in the extruder is reduced, which may cause the material to be plasticized and melted and the mixing is not sufficient. Therefore, the length of the screw must be appropriately increased, which will inevitably cause the twin-screw extruder to actually carry the increase in torque and power.

Enlarging the free volume of the screw groove is also a crucial factor. In the feeding section and devolatilization section, it is very necessary for the screw element to have a large free volume. For bulk materials, expanding the free volume of the feeding section and the filling degree of the material in the screw groove can greatly improve the processing of the extruder. ability.

To increase the torque and speed, the deceleration distribution box needs to be carefully designed. To greatly improve the torque index of the equipment, it is bound to put forward higher requirements for the design and manufacturing level of the transmission box.

The higher the torque, the higher the design, production and manufacturing accuracy, material strength and heat treatment of gears, output shafts, bearings and other parts in the transmission box. At the same time, the design, production and manufacturing of screw mandrels, threaded elements, kneading discs and other parts The accuracy must also be higher.

Because of the need to expand the free volume of the threaded element, the center distance between the two screws will be reduced when the outer diameter of the screw remains unchanged. This will inevitably make the problem of insufficient installation space for the proportioning gear and thrust bearing become more prominent.

How to improve product quality with twin screw extruder:

To obtain high product quality, the design of the core component of the extruder-the plasticization system is of great importance.

The plasticizing system mainly includes screw and barrel. In order to meet the requirements of various types of production and processing, the screw and barrel are generally designed as a modular structure. According to the function of each section, the screw can be divided into feeding section, plasticizing section, mixing section, exhaust section and extrusion section. These sections have different functions in the extrusion process, their structures are different, and the corresponding geometric parameters of the screw elements are also different. Therefore, how to determine the geometric parameters of the screw elements becomes the key to the design of the plasticizing system.

For co-rotating twin screws, there is a certain correlation between the pitch diameter ratio (that is, the ratio between the center distance of the two screws and the screw radius), the number of thread heads, and the thread apex angle. No arbitrary design scheme is allowed, otherwise there will be a problem between the two screws. Intervention occurs. In order to deal with this problem, the author obtains the theoretical end curve of the screw according to the motion trajectory of the two screws, and uses the three-dimensional solid modeling function of large-scale computer-aided design (CAD) software to compile a twin-screw geometric modeling program to realize the three-dimensional solid graphics of the twin-screw It is shown that the geometric parameters of various types and specifications of self-cleaning threaded elements have been obtained, and the meshing of the two screws has been inspected.

In addition, the project practice is also integrated, with the aid of a computer, a three-dimensional solid model of the twin screw with gaps is completed, which can be used to test whether the gap between the two screws is uniform, so that the material has no dead angles in the screw movement, that is, to ensure that the screw has a lot of The strong self-cleaning ability can effectively prevent the material from staying in the machine for too long and degrading, which undoubtedly provides a good production and processing method for the production of high-end and high-quality plastic products.

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