Shenhua Precision Blade Plate Spring Pad: Breaking through the barrier of micrometer-level precision, empowering the high-end die-cutting sector of electronic and new energy industries

With the rapid development of 3C electronics, new energy lithium batteries, and photovoltaic industries, die-cutting technology has already transcended the boundaries of traditional printing and packaging industries and become an indispensable core process in the field of precision industrial manufacturing. The forming of core components such as lithium battery separators, ear insulation pads, optical protection films, flexible circuit boards, and photovoltaic films requires die-cutting precision that has upgraded from the millimeter level to the micrometer level. The knife plate spring pad, as a core supporting component of die-cutting technology, its precision, stability, and specialized performance directly determine the yield and production safety of precise die-cutting products. Shenhua, which has been deeply engaged in the die-cutting supporting field for over twenty years, closely follows the development trends of high-end manufacturing and, in response to the strict working conditions in the electronic and new energy fields, has developed a precision-level knife plate spring pad product system, breaking through multiple technical barriers and achieving the domestic substitution of high-end industrial die-cutting consumables, laying a solid foundation for the high-quality development of China's high-end manufacturing.

The precise die-cutting in the electronic and new energy fields has put forward nearly extreme requirements for knife plate spring pads, which are fundamentally different from traditional printing and packaging scenarios. In the lithium battery die-cutting scenario, the thickness of lithium battery separators is only 6-16 μm, and the insulation pads and ear cutting require "cutting through the substrate without damaging the base material", with burrs controlled within 5 μm. This requires the thickness tolerance of the spring pad to be controlled at the micrometer level, with a highly uniform rebound force; at the same time, the lithium battery production has extremely high cleanliness requirements, and the spring pad must be free of silicon precipitation, no debris, and no dust, even micrometer-level glue debris can cause internal battery short circuits and trigger thermal runaway safety accidents; in addition, it needs to have excellent resistance to electrolyte corrosion to avoid swelling and performance degradation due to long-term contact with electrolyte.

In the 3C electronic optical die-cutting scenario, the die-cutting of optical protection films, polarizers, and conductive adhesives requires spring pads with ultra-low friction coefficients and anti-static properties to avoid scratching high-transparency optical substrates and generating static adsorption dust; the die-cutting of ultra-thin flexible circuit boards requires customized hard or soft spring pads to achieve precise semi-through die-cutting without damaging the circuit layer. However, traditional universal knife plate spring pads in the industry generally have insufficient precision, poor cleanliness, and lack of specialized performance, and are completely unable to meet the requirements of high-end industrial die-cutting. For a long time, this market has been monopolized by foreign brands, and domestic enterprises have faced high procurement costs, long delivery times, and slow customization response to many difficulties.

Shenhua deeply understands the industry pain points of precise industrial die-cutting and launched the specialized research and development of precision-level knife plate spring pads many years ago. It formed a research team composed of polymer materials, precision manufacturing, and die-cutting technology experts, and went through thousands of times of formula adjustments and working condition tests, overcoming multiple industry core technical problems such as "permanent anti-static formula, clean without precipitation system, ultra-thin high-precision forming", successfully developing a full series of precision-level knife plate spring pad products suitable for the electronic and new energy scenarios.

In terms of core precision control, Shenhua's precision-level knife plate spring pads use imported high-precision closed-loop foaming production lines and online ultrasonic thickness measurement systems to achieve full-process closed-loop control of the production process, with product thickness tolerance stable at ±0.02 mm and hardness tolerance controlled within ±1 Shore degrees. Even ultra-thin products with a thickness of 0.1 mm can maintain extreme thickness uniformity, ensuring the precise control of die-cut depth from the source and perfectly achieving the micrometer-level die-cut requirements of "cutting through the surface material without damaging the base paper". For different precision die-cutting scenarios, Shenhua has created a full hardness product matrix ranging from 20 Shore degrees ultra-soft models to 85 Shore degrees ultra-hard models, which can precisely adapt to the die-cutting needs of different materials such as lithium battery separators, optical films, foam, copper and aluminum foils.

In the research and development of specialized performance, Shenhua has achieved breakthroughs in formula customization for the special needs of the electronic and new energy scenarios. In response to the requirements for clean production of lithium batteries, a special formula without impurities and precipitation was developed. High-purity new raw materials were adopted, without silicon, plasticizers, or dust precipitation. The products were produced and tested in a Class 10,000 clean workshop, fully meeting the clean requirements for lithium battery production. For the demand for anti-static properties, a series of permanent anti-static products were launched. The surface resistance can be stably controlled within the range of 10^6 - 10^9 Ω, unaffected by temperature and humidity, effectively releasing static electricity generated during die-cutting, avoiding the adsorption of dust by static electricity and damaging precision components. For the demand for resistance to media, the formula for resistance to electrolyte and organic solvents was optimized, which can long-term withstand the erosion of lithium battery electrolyte and optical adhesive additives, without swelling or performance degradation. The service life exceeds the industry's conventional products by a large margin.

In terms of quality control management, Shenhua has established a full-process quality control system in line with electronic industry standards. Before each batch of products leaves the factory, they must undergo dozens of comprehensive tests including thickness accuracy, rebound rate, cleanliness, anti-static performance, and resistance to media. Only when all indicators meet the internal control standards of the enterprise can they be released for sale, ensuring the consistency of performance of each batch of products. At the same time, in response to the non-standard customization needs of customers, Shenhua has built a flexible production system, enabling formula adjustments and sample production within 72 hours, and achieving batch supply within 15 days. The customization response speed far exceeds imported brands, while the price is only 60%-70% of imported products, possessing strong market competitiveness.

Today, Shenhua's precision-grade knife plate spring pads have successfully entered the supply chain systems of leading domestic lithium battery enterprises, 3C electronic manufacturers, and photovoltaic component enterprises. They are widely used in lithium battery film cutting, optical film die-cutting, flexible circuit board forming, and photovoltaic adhesive film processing, achieving the domestic substitution of high-end industrial die-cutting consumables, breaking the long-term monopoly of foreign brands, and their stable performance and reliable quality have been widely recognized by customers in the high-end manufacturing industry.

In the future, as China's high-end manufacturing continues to upgrade, the market size of precision die-cutting will continue to expand, and the requirements for supporting consumables will also keep rising. Shenhua will continue to delve into the precision industrial die-cutting field, continuously increase R&D investment, continuously break through technical barriers, and with higher-performance and more scene-appropriate knife plate spring pad products, lay a solid foundation for supporting the high-quality development of China's high-end manufacturing, and promote the realization of higher-level self-control of domestic precision die-cutting consumables.