Name: Liaoning Super Group Construction Group Co., Ltd.
Super group hardware accessories store：
Doors and windows, stretch bending and pressboard workshop：
Address: middle section of South outer ring of Dashiqiao
Super group titanium Jinmen window, profile control process. Mixture is the first process of profile production. The performance of blended material plays an important role in the follow-up processing and product quality. It should be controlled as a key process. The extrusion process determines whether the properties of profiles can be achieved or not, and the whole process control is needed.
Mixing material is to accurately measure all kinds of raw materials according to the proportion, and then add to the hot mixer in order to mix. After reaching the prescribed temperature and time, the mixture is cooled and mixed, and discharged at the discharge temperature. The purpose is to prepare loose and uniform dry mix, so that all auxiliaries are dispersed evenly, and some of the materials are gelatinized (i.e., pre plasticized).
In this process, on the one hand, periodic identification and measurement should be carried out on the measuring instruments (such as metering scale, thermometer, thermocouple, etc.) used for mixing ingredients to ensure the accurate mixing of raw material additives according to the prescribed proportion; on the other hand, the temperature and mixing time of the mixture should be recorded and monitored, and the temperature and mixing of the mixture should be observed and paid attention to at any time. The fluctuation of time. Check whether the thermocouple and temperature control instruments are in place or malfunction regularly, so as to prevent the mixing temperature from getting out of control. This kind of situation happened in a certain enterprise: because the thermocouple of the mixer was shaken off by long-term vibration, the actual temperature of the mixture was too high, and the mixture changed color. If we can conscientiously implement the quality management system, such problems can be easily avoided. After that, the mixed dry materials should be stored at room temperature for 8-12 hours to ripen, eliminate static electricity, improve the fluidity of the dry mixture, improve the smoothness of the extruded products, and make the profile quality more stable. In addition, the mixed dry materials should be tested for their properties, such as thermal stability test, volatile content test, etc. In order to identify hidden problems, ensure the quality of profile products.
In extrusion process, the quality of profile depends mainly on the plasticizing degree of the material. The plasticizing energy of materials depends on external heating and screw shearing. If the extrusion temperature (especially the feeding section and plasticizing area) is too high, or the screw speed is too fast, the material is easy to produce superplasticization and cause local decomposition and melt rupture, too much gas can not be discharged in time, accumulated in the profile, resulting in bubbles in the profile. When the temperature is too low or the screw speed is too slow, the heat shortage will cause poor plasticization, so that the melt viscosity increases, the head pressure rises, equipment overload operation, equipment wear and energy waste. Similarly, improper ratio of traction speed to screw speed, improper cooling water control, and extruder performance will also affect the plasticization quality of materials. Here, the influence of extruder is emphasized. Some enterprises have been running equipment for seven or eight years. The screw has been worn seriously, but the assembly precision between screw and barrel has never been adjusted. They still use the original formula for production. This will undoubtedly affect the plasticizing effect of materials, and the quality of profiles will be improved year by year. Drop. Therefore, in equipment management, the key parts should be maintained regularly, and the clearance between the screw and the barrel should be adjusted according to the screw wear condition in time, so as to ensure sufficient shear force of the screw, ensure friction heat generation, and ensure the plasticizing effect of the material.