In the freeze-drying process, the vacuum degree always fails to reach the set value, thus affecting the drying effect of the material is a common problem. This may be due to the aging of the sealing rubber strip of the freeze-drying machine door; The pipe joint is loose, and there is air leakage in the connection part; Or vacuum pump failure and other reasons. In order to solve this problem, the operator should regularly check the seal of the freeze-drying machine, if it is found to be aging and damaged, it should be replaced in time; At the same time, the operator can also use professional leak detection equipment to carefully check the various connected departments of the machine to ensure that there is no leakage; In addition, the vacuum pump should be regularly maintained to determine its stability.
If the temperature cannot be maintained at a low level during the freeze-drying process, the high probability is that the refrigeration system has failed. If there is a problem with the compressor, refrigerant leakage, poor cooling of the condenser, or the temperature sensor shows that the temperature is not consistent with the actual temperature, it will lead to poor refrigeration effect of the freeze dryer. When this happens, it is necessary for professional technicians to overhaul the compressor, find and repair the refrigerant leak point, clean the condenser, and ensure that its heat dissipation is good. If the sensor is damaged, it should be repaired and replaced in time.
The freeze-drying effect of the same batch of materials is uneven, some of the drying effect is good, and some of the water content is too much, which may be caused by insufficient pre-freezing, uneven material placement or improper sublimation process control. In order to ensure that the freeze-drying effect is better, the material can be completely frozen at a low temperature in the pre-freezing stage. In the process of placing the material on the tray, the uniform and reasonable placement ensures that there is enough space between the materials. At the same time, in the sublimation stage of the freeze-drying process, the temperature and vacuum degree should be strictly controlled to facilitate the transfer of heat and the discharge of water vapor.
If the freeze-drying machine produces large noise during operation, it will affect the working environment. This can be due to uneven installation of equipment, wear of components such as vacuum pumps or compressors. In this case, we must first adjust whether the equipment is placed in good condition, the operator should regularly perform lubrication maintenance and replacement of the equipment, but also check the pipeline, if necessary, can install a shock absorber on the pipeline to reduce noise.
