The advantages of the dry granulator: the dry granulator generally does not need to add additives, and can directly make dry powder into particles, increase the packing density, improve the appearance and fluidity and control the disintegration degree, easy storage and transportation, save energy than the wet granulator, improve the multi-process of the wet granulator, and reduce pollution. Effective sterilization, and for some unstable drug granulation under hot and humid conditions is more obvious.
The scope of application of dry granulator: generally containing crystalline water materials, Chinese medicine extracts, and materials containing a certain amount of water (3%-8%) can be dry granulated, in addition to a few special materials such as flour, carbon black, graphite and other materials are difficult to granulate, and pure Chinese medicine crushed without special treatment is also difficult to granulate, you can consider adding appropriate accessories; The fineness of the powder is better at about 80-300 mesh, which has a greater impact on the coarse or fine powder and the dry powder granulation: for the coarse powder, the granulation particles are not uniform, and for the fine powder, there is a certain difficulty in feeding and pressing, which will directly affect the yield of the particles.
Dry granulator yield: the principle of dry granulator is the dry powder directly pressed into thin sheets and then crushed and whole grain, so the dry grain yield is high and low, first of all, has a direct relationship with the material formula, good compressibility material yield to the highest; In addition, the strength of the pressed sheet and the structure of the pelleting tool and the speed of crushing have a great relationship, the strength of the pressed sheet is related to the size of the pressure and the feeding and pressing speed, the feeding process is also a pre-pressing process and degassing process, if the air in the material is discharged as much as possible, and the material has a pre-staying area, so that the pressed sheet will not appear intermittent, In this way, when other conditions remain unchanged, the yield will be relatively increased; The tool structure of pelleting will directly affect the particle yield, if the pressed sheet in the pelleting box frequency crushing, this will also reduce the yield, the use of rolling, so that the material quickly rolled out of the screen, and improve the yield, the slower the crushing speed the higher the particle yield, in the case of not blocking the mesh as slow as possible.
Domestic standards as long as the yield of 30% dry granulator has met the requirements. (starch as the standard 20-60 mesh) Material discoloration in the granulation process: The color of the general material will be different from the original powder after dry granulation, because the surface area of the powder is larger than the surface area of the particle, so the reflection of light is also different. In addition, the packing density of the pressed particles increases compared with that of the original powder, so the color of the particles will also be deepened. Under normal circumstances, the greater the pressure on the press wheel, the darker the color will become. The pressure acting on the press wheel is not only the pressure of the oil pump, but also related to the feed speed and the press speed, in the case of a certain pressure and press speed, the faster the feed speed, the greater the pressure between the press wheels, the smaller the vice versa, the same in the case of a certain pressure and feed speed, the slower the press speed, the greater the pressure between the press wheels, the vice versa. Therefore, the user should choose an appropriate pressure and speed according to the actual situation of the material when using the dry granulator, so as to improve the product yield on the basis of ensuring product performance. The dry granulator is suitable for a variety of materials, so the pressure of the dry granulator, feeding, pressing, crushing, and whole grain speed can be adjusted, so that the requirements for the operation of the dry granulator will be higher, and the manufacturer will generally provide a relative parameter before leaving the factory. But in actual use, according to the characteristics of the material and the required particle strength, particle size reasonable adjustment, generally for the good flow of the material, the feeding speed can be slower, the pressure of the easily formed material can be smaller, for the larger particles, the crushing speed can be slower, as long as the screen mesh can be blocked, in the adjustment, The other parameters can be unchanged, the appropriate change of a parameter to adjust. In short, adjust the parameters, as long as the meaning of each parameter can be mastered, in the actual operation according to the specific situation to adjust, but also by constantly experimenting to sum up experience, to achieve the best results.
The roundness of dry granulator particles: The roundness of the dry grain is slightly worse than that of the wet grain, but the roundness of the dry grain has a certain relationship with the thickness of the piece and the form of the granulating tool. (In addition to the material itself) the roundness of the particle can be improved by changing the thickness of the piece. Generally, the thickness of the pressed piece can be properly adjusted according to the size of the particle. In this way, the roundness of the particles after the whole grain is better, and the structure of the whole grain knife is improved, and the roundness of the particles can also be improved. In short, I hope that customers before choosing the dry granulator, it is best to send us some materials, do a test first, to see whether the particles can meet the needs of customers, because each material, each formula will have different results, so that customers can choose a more suitable equipment.
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