The basic understanding and core function of the knife plate elastic pad

The ejection rubber is an indispensable accessory in die-cutting and creasing processes. It is mainly installed on both sides or the back of the knife plate's knife body. The material is mostly high molecular materials such as polyurethane and rubber, which have high elasticity and wear resistance. Its core function is to cooperate with the die-cutting plate to precisely die-cut substrates such as paper, cardboard, and film, while alleviating the impact force during the die-cutting process, protecting the cutting edge of the die-cutting plate, and enhancing the qualification rate and production efficiency of die-cut products.

In die-cutting operations, the role of the ejection rubber is mainly reflected in three aspects. Firstly, there is buffering and pressure reduction. During die-cutting, the die-cutting plate is pressed down at high speed. The elastic pad absorbs part of the impact force through its own elastic deformation, preventing the die-cutting plate from chipping or deforming due to rigid impact, and thus extending the service life of the die-cutting plate. Secondly, there is positioning and compaction. During the pressing process of the knife plate, the spring pad comes into contact with the base material before the blade edge, flattening and compacting the base material to prevent displacement and edge lifting of the base material during die-cutting, ensuring the accuracy of the die-cutting dimensions. Finally, there is the auxiliary material removal. After the die-cutting is completed, when the die-cutting plate rebounds, the elastic pad relies on the elastic recovery force to lift the die-cut base material or waste from the blade edge, avoiding the occurrence of knife sticking or material jamming, and ensuring the continuity of the production process.

The performance of the ejection rubber directly affects the stability of the die-cutting process. High-quality die-cutting plate spring pads should have a stable elastic recovery rate, good fatigue resistance and wear resistance, and be able to maintain stable performance during long-term and high-frequency die-cutting cycles without permanent deformation, cracking and other problems. Different die-cutting substrates, die-cutting plate types and die-cutting precision requirements also have different adaptation standards for parameters such as the hardness, thickness and density of the die-cutting plate spring pad.