How to choose the right extruder for PVC production

In the plastic industry, PVC is one of the plastic products with the largest output in the world. Plastic product manufacturers need to consider many aspects when choosing the core equipment such as extruder. In order to better produce high-quality plastic products, Jiangsu Xinrongplas Machinery Co., Ltd. simply provides you with some suggestions for selection. The extruders required for PVC production belong to plastic extruders, and PVC plastic extruders can be divided into single-screw plastic extruders, twin-screw plastic extruders and multi-screw extruders according to the number of screws. Both single-screw and twin-screw extruders are used in practice.

More than 20 years ago, the PVC production industry mostly used gradient single-screw plastic extruders. However, PVC is a heat-sensitive plastic. In order to prevent the pyrolysis of the material, the screw speed of the extruder should not be too high (the output is low) during the production process. Now with the emergence of a special extruder for PVC powder, no granulation is required, and the powder can be directly extruded to produce molded products. Now it is mainly used in the production of PVC soft materials.

In the production of PVC rigid products, the advanced conical counter-rotating twin-screw extruder is mainly used, and the price of this extruder is relatively appropriate. When using the conical double extruder, due to the special structure, the PVC powder will not generate excessive friction heat during extrusion, which can avoid the decomposition of the material to a limited extent, the extrusion volume of the equipment can be stabilized, the output of finished products is higher and Performance can be better guaranteed. In recent years, when producing rigid PVC products, we suggest that the conical twin-screw plastic extruder should be given priority.

Now a small number of plastic products factories are also using parallel twin-screw extruders for the production of PVC extruded pipes and profiles. However, for the two extruders mentioned above, the one-time investment cost of the equipment is high and the equipment maintenance is complicated. Especially when producing rigid PVC products, the damage to the equipment is greater than that of the cone double, which may The service life of the equipment in the later stage will be affected, so there are still relatively few applications at present.

After determining the form of the extruder, we also need to understand the specifications of plastic products at this time. By analyzing the amount of material according to the different specifications of the product, and then referring to "screw diameter and product specification size, output", a reasonable selection is made.

The above are some simple suggestions on how to correctly choose the extruder for PVC plastic products. If you need more professional and detailed technical advice, you are welcome to inquire.