What is the mechanism of Bimetallic Screw And Barrel in improving the melting uniformity of products?

1. Material properties and thermal conductivity
Bikini structure: Bimetallic Screw And Barrel uses a combination of two or more different metal materials, which have excellent thermal conductivity. For example, some metal combinations can more effectively transfer heat from the heating source to the plastic material, thereby improving the melting efficiency.
Thermal stability: The selected metal materials have high thermal stability and corrosion resistance, and can maintain stable performance under high temperature and high pressure environments, ensuring the continuity and uniformity of the melting process.
2. Structural design optimization
Screw design: The spiral groove design of the bimetallic screw can optimize the flow path of the plastic material, so that the material is evenly heated and melted under the push of the screw. By adjusting the compression ratio, shear rate and other parameters of the screw, the melting process can be further controlled and the melting uniformity can be improved.
Barrel fit: The inner wall of the barrel fits closely with the screw to form a certain gap. The size and shape of this gap have an important influence on the melting and flow of the material. By precisely designing the profile and surface roughness of the inner wall of the barrel, the retention and overheating of the material in the barrel can be reduced, and the melting uniformity can be improved.
3. Heating and cooling system
Efficient heating: Bimetallic Screw And Barrel is usually equipped with an efficient heating system, such as an electric heating ring or a steam heating tube. These heating elements can quickly transfer heat to the screw and barrel, so that the plastic material reaches the melting temperature in a short time.
Precise temperature control: The temperature of the screw and barrel can be precisely controlled through an advanced temperature control system. During the melting process, the heating power and temperature setting value can be adjusted according to the melting state and processing requirements of the material to ensure the stability and uniformity of the melting process.
Cooling assistance: In some cases, a cooling system is also used to assist in controlling the melting process. By introducing a cooling medium (such as water or oil) into a specific area of ​​the screw and barrel, the temperature of the area can be reduced and the material can be prevented from overheating or burning.
4. Material mixing and shearing action
Strong shear force: The bimetallic screw will generate strong shear force on the plastic material during rotation. This shear force helps to break the material into smaller particles and mix them evenly, thereby improving the uniformity of melting.
Material flow: The rotation of the screw also pushes the material forward in the barrel. During the flow process, the material is constantly subjected to shear, extrusion and stretching forces, which help the material to melt and mix better.