The eight coups teach you how to determine the quality of the blanket

Offset printing is a type of indirect printing process where the image from the printing plate is first transferred to a rubber blanket, and then from the blanket to the printing material through the pressure between the blanket and the impression cylinder. As a result, the quality of the blanket plays a crucial role in the overall quality control of offset printing. Several factors need to be considered when evaluating the quality of a blanket. **Elasticity** The higher the elasticity of the blanket, the better its ability to quickly rebound after being compressed. This is essential for high-speed printing, as it ensures better dot reproduction and allows for more accurate replication of the original image. **Surface Roughness** A smoother surface on the blanket leads to better dot reduction performance. However, if the surface is too smooth, it may reduce the paper release properties, which can affect the overall print quality. **Roughness** If the surface roughness of the blanket is too high, it may lead to uneven ink distribution, causing issues like dot gain and unstable solid density. This can also increase the contrast in printed images, making the final output less consistent. **Responsiveness** Over time, the blanket may undergo permanent deformation due to repeated compression. A blanket with good resilience will maintain its thickness and performance longer, thus extending its lifespan and ensuring consistent print quality over time. **Stretchability** In sheet-fed offset presses, the blanket stretches around the cylinder. A blanket with good stretchability ensures minimal distortion during the printing process, resulting in better dot reduction and improved registration. **Antioxidant Properties** The blanket is often exposed to cleaning solvents, which can penetrate its edges and cause damage. A blanket with strong antioxidant properties resists degradation, maintaining its integrity and prolonging its service life. **Oil and Solvent Resistance** During printing, ink can permeate into the surface of the blanket. A surface that is resistant to oil and solvents makes cleaning easier and reduces the occurrence of ghosting effects, which are unwanted imprints left on the paper. **Resistance to Force** The resistance of the blanket is influenced by its elasticity and hardness. When the hardness is around 81HA, the blanket achieves an optimal balance between resistance and stability, ensuring consistent print quality. For more detailed information, please refer to official sources or industry guidelines. [Note] China Packaging Information Network is the official website of China Packaging News and China Packaging Industry Magazine. Contact: Gu Yingyi, Mobile Phone: [Insert Number] Please follow our WeChat public platform for more updates and news. 

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