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Rotary Compression Molding
Rotary compression molding is a type of molding process used for the manufacturing of engineered plastics and gels. In this process, a plastic raw material is placed in an open form and then compression forces are applied in order to create a bag of material. The forces can be applied statically or dynamically with a type of rolling movement at a limited speed. The rotating force is known as the kneading force. The two processes which are used in rotary compression molding are pressure and shear.
During the pressure process, the material is forced against the shaped walls of the mold due to the pressure to the material. The material is sheared, or cut, by the mold walls and plasticizers causing the material to spread in all directions. This creates a uniformly 3D shape.
During the shear process, the materials are compressed while the kneading applies shear forces perpendicular to the direction of the molding which further plasticizes the material. Additionally, the molds are driven in a circular motion, as this motion helps to form plastic materials into the desired shape and size.
Rotary compression molding provides various advantages for manufacturers. First, this process can achieve an accuracy of +/- 0.1 mm, which allows for precise and efficient production. Additionally, the process is relatively fast as the molds can produce up to 200-230 components per minute. Furthermore, rotary compression molding is not limited to a single material and can handle both thermoplastic and thermoset materials. Lastly, the process is not limited to a single product, allowing for a wide range of products.
Rotary compression molding is a useful tool for manufacturers looking for a faster, more accurate, and more efficient method for producing plastic components. The process is ideal for mass production of small sized parts, as it can achieve high accuracy with a quick-cycle time. Additionally, the process is suitable for various types and materials. The main limitations of this process are that it is not applicable for large parts and it is limited in the complexity of shapes possible.
