Advantages Of Two-stage Extruders（Next Article）

For the shaping of multi-two-component heat-sensitive polymer materials, ensuring high-quality physical performance index values ​​of raw materials is inseparable from the study of the "low temperature environment" molding process of polymer materials. Equipment, a two-stage extruder consisting of an upper stage machine and a lower stage machine. The upper stage of the two-stage extruder uses a co-rotating parallel twin-screw mixing extruder, and the lower stage uses a single-screw extruder to shape the extruder. It is recognized as a "one-step method" for the same polymer material. The main equipment for shaping and extrusion.

Let's analyze together how to achieve the described "low temperature environment" extrusion through two-stage extrusion molding, which is similar to a parallel twin-screw extruder plus a single-screw extruder.

First, let's analyze the raw material operation process. The upper-stage machine uses a co-rotating parallel twin-screw extruder for reasonable dispersion and spreading of raw materials, especially when it is suitable for the shaping and extrusion of heat-sensitive polymer materials with multiple two-component raw materials, such as soft Production and processing of high-quality PVC artificial leather surface sheets. The production materials include powdered resin, powdered calcium powder, powdered plasticizer, powdered additives and powdered toner, etc. There are 7 kinds of two-component raw materials.

On the other hand, the design of this type of double-stage extruder can make full use of the upper-stage parallel co-rotating twin-screw extruder to force the raw materials to move in the figure of eight under the action of the twin-screws, and make full use of the mixing effect of the flat twin extruder.

On the other hand, it can make full use of the lower-stage single-screw extruder to force the forward movement of raw materials, and can focus on the cooling and stable pressure extrusion of raw materials.

The two types of extruders are functionally decomposed separately and combined into a whole, which is conducive to improving the design of the parameters of the two-part extrusion host. This type of extruder is not only beneficial to the low-temperature extrusion of the product, but also beneficial to the extruder. The increase in specific flow rate and the decrease in specific power achieve the purpose of reducing energy consumption and improving efficiency.