This standard addresses the critical core components in high-end manufacturing fields such as new energy batteries and optical films, establishing a comprehensive technical framework spanning the entire industry chain from design and manufacturing to delivery. The core of the document lies in specifying key parameters such as the tolerance range for the straightness of the die lip, the micrometer-level coating gap, and the surface roughness of internal flow channels, aiming to ensure the consistency and stability of coatings. During the inspection phase, relevant parties must use a laser interferometer to conduct three-dimensional mapping of the die lip flatness to verify mechanical precision, employ high-precision online thickness measurement systems (such as beta-ray or infrared sensors) to continuously scan the coating surface density, and utilize industrial microscopes equipped with high-magnification lenses to inspect the die lip for microscopic defects or residual impurities.