• Categories:News Center
• Time of issue:2022-05-06 13:58

(Summary description)With the continuous development of modern industrial production and the continuous enhancement of people's awareness of environmental protection, the safe, airtight and clean pneumatic conveying technology is increasingly favored by various industries. In industrial production, the positive pressure pneumatic conveying in the pneumatic conveying technology is more commonly used. According to the material-gas ratio of the material in the pipeline, it is divided into two conveying modes: dense phase conveying and dilute phase conveying. In PVC production, this conveying technology is also commonly used for conveying PVC powder. Today, let's talk about the influence of different pneumatic conveying methods on the quality of PVC.     ①Influence of air source device on PVC quality The air with high humidity will have impurities such as oil stains and rust after being pressurized. Generally, a cooler and a dryer need to be installed to eliminate the influence of impurities, but on the other hand, this will cause a large pressure loss to the fan. The dense phase pneumatic conveying uses compressed air as the driving force, and the air obtained by entering the compressor is clean and dry, without the above problems. ②The influence of valve accessories on the quality of PVC Due to the problem of processing accuracy, the general rotary valve will cause the PVC powder to enter the end cover and bearing of the rotor to form a "plasticized block", which will cause pollution to the product and reduce the service life of the equipment. However, dense phase pneumatic conveying generally adopts static equipment, which completely solves the problem of "plasticizing block", and the valve used can also run stably for a long time without being affected. ③Influence of conveying speed on PVC quality If the conveying speed is too high, it will cause the high-speed friction between the PVC powder and the conveying pipe wall, and generate a lot of heat, which will cause the PVC to decompose and turn yellow, or even melt, which greatly limits the use of dilute-phase pneumatic conveying. Dense-phase pneumatic conveying solves this problem well because of its high solid-gas ratio and slow conveying speed.