Shenhua Printing Precision Grade Die Plate Spring Pad: Breaking through the micrometer barrier, empowering the high-end die-cutting segment of the electronic new energy industry

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 millimeter-level to micrometer-level. As for the die-cutting tooling spring pads, which are the core supporting components of die-cutting technology, their precision, stability, and specialized performance directly determine the yield rate and production safety of precise die-cutting products. Shenhua Printing, 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 die-cutting tooling spring pad product system. It has broken through multiple technical barriers and achieved 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 almost extreme requirements for die-cutting tooling springs, 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 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 the spring pad to have an ultra-low friction coefficient and permanent anti-static performance to avoid scratching high-transparency optical substrates and generating static dust adsorption; the die-cutting of ultra-thin flexible circuit boards requires customized hard or soft die-cutting spring pads to achieve precise half-through die-cutting without damaging the circuit layer, which puts forward higher requirements for the hardness accuracy and rebound stability of the spring pad. However, the traditional general-purpose die-cutting tooling spring pads in the industry generally have insufficient precision, poor cleanliness, and lack of specialized performance, and are completely unable to meet the needs 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 times.

Shenhua Printing deeply understands the industry pain points of precise industrial die-cutting and launched the specialized research and development of precision-level die-cutting tooling spring pads many years ago. It established a research team composed of experts in polymer materials, precision manufacturing, and die-cutting technology, and went through thousands of times of formula adjustments and working condition tests. It overcame 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 die-cutting tooling spring pad products suitable for the electronic and new energy scenarios.

In terms of core precision control, Shenhua Printing's precision-level die-cutting tooling 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. The product thickness tolerance can be stably controlled within ±0.02 mm, and the hardness tolerance can be 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 precise die-cutting scenarios, Shenhua Printing 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 terms of specialized performance research and development, Shenhua Printing has achieved a breakthrough in customizing the formula to meet the specific requirements of the electronic new energy field. In response to the clean production requirements of lithium batteries, a dedicated formula without precipitation was developed, using high-purity new raw materials without silicon, plasticizers, or dust precipitation. The products are produced and tested in a 10,000-level clean workshop, fully meeting the clean requirements of lithium battery production. For the demand for anti-static properties, a permanent anti-static series of products was launched, with the surface resistance stable at 10^6 - 10^9 Ω, unaffected by temperature and humidity, effectively releasing static electricity generated during die-cutting and avoiding the adsorption of dust by static electricity and damaging precision components. For the demand for resistance to media, the formula for resisting electrolyte and organic solvents was optimized, capable of long-term tolerance to the erosion of lithium battery electrolyte and optical adhesive additives, without swelling or performance degradation, with a service life far exceeding industry standard products.

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

Today, Shenhua Printing's precision-level die plate spring pads have successfully entered the supply chain systems of leading domestic lithium battery enterprises, 3C electronic manufacturers, and photovoltaic component enterprises, widely used in lithium battery separator 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 its 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 continue to increase. Shenhua Printing will continue to focus on the precision industrial die-cutting field, continuously increase R&D investment, continuously break through technical barriers, and with higher-performance and more scene-appropriate die 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.