What Are The Working Areas Of The Twin Screw Extruder?


Ningbo Fangli Technology Co., Ltd. is a mechanical equipment manufacturer with nearly 30 years’ experiences of plastic pipe extrusion equipment, new environmental protection and new materials equipment. Since its establishment Fangli has been developed based on user’s demands. Through continuous improvement, independent R&D on the core technology and digestion & absorption of advanced technology and other means, we have developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply / gas pipe extrusion line, which was recommended by the Chinese Ministry of Construction to replace imported products. We have gained the title of “First-class Brand in Zhejiang Province”.



1. Inlet area

What basically happens here is the suction, compression and transportation of raw materials. If you want to have unique product characteristics, you can choose to add additives at this stage. The resin is fed into the twin-screw extruder through the hopper and into the screw through the feed throat. Then the screw moves the material forward. The suction capacity depends on a number of factors, including screw speed and resin density. It also depends on the channel depth and pitch of the screw.


2. Melting zone

Once the material enters the screw, the extrusion process begins. The screw keeps pushing the resin forward. When this happens, friction occurs between the material and the barrel, causing the resin to melt. The extra heat comes from the heater under the barrel. This ensures that the resin is completely melted. As the resin moves forward, the channel depth continues to decrease, thereby increasing the friction and pressure in the barrel.


3. Measuring area

"Once the polymers are melted, they leave the extruder through a crushing plate with a screen. The melting of particles that do not melt in the melting zone also occurs here. This ensures the uniformity of the molten resin. If you want to achieve plastic uniformity, you can control the number of screens and the porosity of the screens. The pressure here is so high that the molten polymer can be continuously extruded and formed into shape. In this section, there is air pumping to prevent plastic products from collapsing.


4. Cooling zone

The plastic product moves to the cooling area, where it is cooled. You can use two types of cooling systems. There are air and water cooling systems. Depending on the type of cooling system you use, plastic products will cool slowly. This allows plastic products to form perfect shapes and gives them the attractiveness they deserve.


If you need more information, Ningbo Fangli Technology Co., Ltd. welcomes you to contact for a detailed inquiry, we will provide you with professional technical guidance or equipment procurement suggestions.


  • QR