What is the working principle of cold pressing granulation technology?

Cold pressing granulation uses a cold cutting granulation method. The entire process requires no heating; its working principle is based on mechanical pressure and physical molding. First, the pre-treated antioxidant raw materials are conveyed to the inlet of the cold press granulator and enter the extrusion chamber. Inside the extrusion chamber, a pair of intermeshing pressure rollers driven by a motor rotate relative to each other at a specific speed and pressure. When the raw materials enter the wedge-shaped space between the two pressure rollers, they are subjected to gradually increasing extrusion pressure. Under the action of strong mechanical pressure, the loose raw material particles approach each other and compactly accumulate. The gaps between the particles are compressed, and the distance between the molecules is shortened. Relying on the forces of intermolecular attraction, electrostatic force, and mechanical interlocking, the raw material particles gradually aggregate and form sheet materials with a certain strength and shape.

Subsequently, these sheet materials are conveyed to a crusher, where high-speed rotating blades in the crusher break the sheet materials into smaller particles. Then, the crushed particles enter a sizing machine. The sizing machine screens and shapes the particles through a screen, removing large particles and fine powder that do not meet the size requirements, making the particle size more uniform and the shape more regular. After screening and shaping, the particles enter a cooling system, where the particle temperature is lowered by air cooling or water cooling to prevent performance changes due to frictional heat, finally obtaining qualified antioxidant particle products.

In the entire cold pressing granulation process, since no heating is involved, it avoids problems such as changes in the chemical composition of the antioxidant and changes in plasticizing properties caused by high temperatures, maximizing the retention of the original properties of the antioxidant. At the same time, this process produces less dust and noise, has low energy consumption, and conforms to the concept of green production. It has significant advantages in industries with strict requirements on product performance and strict control of energy consumption and the production environment.