A dry granulator is a powder granulation equipment that directly produces uniform granule products without adding any binders. It is particularly suitable for processing dry powder or fine crystalline raw materials containing crystalline water, effectively reducing dust pollution and material waste, simplifying the process flow, lowering granulation costs, and improving the working environment. Its operating principle is based on a mechanical extrusion granulation process: the raw material is first squeezed into thin flakes and then processed into the desired size through a screen.
During operation, raw materials can be fed into the hopper manually or via a vacuum feeder. They are then conveyed and pre-compressed by a vertically placed feeding screw, which pushes them into the nip angle of two compacting rollers. Subsequently, the raw materials are squeezed into thin flakes by horizontally placed rollers. The required pressure is linearly transmitted to the rollers by a hydraulic device, which maintains a stable pre-pressure to ensure consistent material density.
To meet different granule size requirements, the screen mesh size in the granulation system can be freely replaced. This method directly transforms powders or fine crystals into granules that meet user requirements without any intermediates or additives. The resulting granules have a uniform particle size and a significantly increased bulk density, which improves flowability, controls dust emission, reduces waste, and facilitates storage and transportation, while allowing better control over characteristics such as solubility, porosity, and specific surface area.
Hansheng Automation supports the precise manufacturing of non-standard components based on client drawings. We can provide custom precision machining services for key wear parts in dry granulators, including rollers, feeding screws, and screen frames. Through our high-precision machining, we not only help clients address the pain point of severe component wear during the processing of complex or difficult materials but also effectively expand the application range of their equipment, ensuring stable operation across the pharmaceutical, chemical, and food industries.
