UK saw dew point meter applied in plastic drying process to ensure product quality

British Shaw dew point instrument used in plastic drying production process to ensure product quality Keywords: British Shaw, We all know that the dew point is one of the indicators to measure the water vapor content of compressed air In other words, the lower the dew point temperature, the lower the water content of compressed air Therefore, dew point and dew point instrument have become one of the key factors that many users need to consider when purchasing equipment The moisture content of plastics is an important factor affecting the processing technology, product appearance and product characteristics of resins such as polyamide (PA) and polycarbonate (PC) Too much moisture in the plastic will reduce product strength and result in poor surface finish In addition, the excessive drying of polymer wastes energy, and the unnecessary prolongation of the residence time of materials in the dryer will also reduce the production efficiency The dew point control of dryer is helpful to get good product quality with low production cost of Zui In the process of injection molding, if the plastic particles with excessive moisture content are used for production, there will be some processing problems, and Zui will eventually affect the quality of the finished product, such as: surface cracking, reflection, anti operation, as well as mechanical properties such as impact resistance and tensile strength are reduced Therefore, the control of moisture content is very important for the production of high quality plastic products Most engineering plastics and plastic alloy particles contain different degrees of moisture, which is distributed on the surface and inside of the plastic particles If the drying of the plastic particles is not good, the internal and external quality of the plastic products will be affected, and the processing will be difficult The internal quality of plastic products shows that its performance indexes are obviously reduced, the internal stress is increased, and it is easy to crack, which promotes the hydrolysis and degradation of polymers; the external quality shows that the products are yellowing, producing bubbles, hairdefects, silver wires, stripes, and the transparency is reduced   UK saw dew point meter is used to measure plastic, plastic, rubber, silica gel, natural rubber, latex, plastic filler, plastic masterbatch, color masterbatch, resin, nylon, plastic raw materials, plastic particles, PVC PVC PVC, ABS plastic, PA nylon (polyamide), POM POM, PC polycarbonate, pet plastic, PBT plastic, PPO material, PPS polyphenylene sulfide, peek and poly The dew point value of gas in the process of PES The UK saw dew point meter is used in the plastic drying process to ensure the product quality It is difficult to dry the hygroscopic materials because the moisture is absorbed into the internal structure of the plastic particles The moisture content of wet pet particles can be up to 0.6% by weight The residual moisture content of pet must be dried to 0.003% (30 ppm) before processing according to the different process Internal moisture is removed by heating the pellet material while exposing it to the dry air fed by the dehumidifier dryer The Shaw dew point apparatus is usually installed in front of the heater and hopper If the transmitter is installed after the heater, due to the high air temperature, the dew point meter is not always directly installed on the process pipeline, and often requires a sampling system The sampling system cools (if necessary) and filters the air sample before it enters the sensor If the process is operated at a lower pressure or for environmental pressure, the sampling system shall be equipped with an air pump in order to draw sample gas from the process In addition to measuring in the dryer, monitoring the hopper dew point allows the operator to optimize the drying time Once the measured dew point is stable at a preset low level, it is considered to complete the drying cycle Prolonging the time that the material stays in the hopper will not improve the drying effect Monitoring the dew point of the air in and out of the hopper can ensure that the drying process conditions for the whole duration of the drying cycle remain Zui good