Shenhua Printing Material Knife Plate Spring Pad: Special Anti-Impurity and Anti-Clogging Solution for Recycled Paper Die Cutting

Recycled paper is widely used in  boxes, ordinary cartons, and low-end packaging due to its low cost and environmental friendliness. However, recycled paper contains a lot of impurities, has loose fibers, and is prone to shedding. During die-cutting, impurities are likely to embed in the spring pad texture， and waste materials are prone to get stuck， resulting in accelerated wear of the spring pad， machine stoppage due to clogging during die-cutting, and a higher defect rate. Conventional spring pads have insufficient resistance to impurities and prevention of clogging, making them difficult to adapt to the strict working conditions of recycled paper die-cutting. Deephua Printing Materials focuses on the pain points of recycled paper die-cutting and has developed a special knife plate spring pad for recycled paper， achieving a balance between resistance to impurities， prevention of clogging， and low cost.

In terms of material optimization， a high-maintenance and anti-impurity composite rubber formula is adopted， with silicon carbide anti-friction particles and anti-blockage components added to enhance the hardness of the spring pad surface (Shore A 70-75)， resisting the friction and wear caused by impurities in recycled paper， and reducing the probability of impurities embedding in the spring pad surface； the material toughness is optimized to avoid tear and shedding of the spring pad caused by impurity scraping， with a service life that is over 45% longer than that of conventional spring pads. To address the problem of loose fibers and easy shedding of recycled paper， the surface of the spring pad adopts a coarse texture anti-slip design with a texture depth of 0.15mm， which can guide waste materials to fall quickly， avoid clogging， and enhance the adhesion with the knife plate， ensuring uniform pressure transmission.

In terms of structural design， the edge of the spring pad is treated with thickening sealing processing to prevent impurities from seeping into the spring pad from the edge， causing aging and elastic attenuation of the spring pad； multiple thickness specifications of 1.5-3.0mm are launched to meet the die-cutting requirements of different thicknesses of recycled paper， with thickness error controlled within ±0.05mm， ensuring uniform pressure for the entire sheet and avoiding local cutting failure or local collapse. After a certain recycled paper packaging enterprise applied this solution， the frequency of machine stoppage due to clogging during recycled paper die-cutting decreased by 80%， the spring pad replacement cycle was extended from 3 days to 10 days， and the defect rate was reduced from 10% to 1.2%， significantly reducing production losses and costs.