Surface Finishing Process Of Polished And Gold-Plated Micro Needles

Pain Points

Surface finishing is a key process affecting the appearance and performance of micro needles, and traditional polishing and gold-plating processes have many quality defects. Ordinary polishing processes cannot eliminate microscopic scratches and surface roughness of micro needles, resulting in increased skin friction during use, poor painless effect, and easy adhesion of skin debris and drug residues. The traditional gold-plating process has uneven coating thickness, poor adhesion and easy peeling. The peeled gold-plated layer will not only affect the appearance, but also cause tiny particle residue, bringing hidden dangers to skin health. In addition, improper finishing parameter setting leads to local over-processing, resulting in micro needle tip deformation and structural damage, affecting the minimally invasive and precise targeting performance of products. Unstandardized finishing processes also lead to poor batch consistency of product surface effects, large quality differences between products, and difficulty in meeting high-end beauty and medical application standards.

Working Principle

The surface finishing of micro needles adopts physical polishing and electrochemical gold-plating composite process principle to realize dual optimization of product surface smoothness and anti-oxidation performance. Precision physical polishing uses ultra-fine abrasive materials and high-frequency vibration grinding technology to remove surface burrs, scratches and oxide layers of micro needles, reduce surface roughness to mirror level, and form a smooth and flat surface. The smooth surface can effectively reduce skin friction resistance, realize painless minimally invasive penetration, and avoid residue adhesion. Electrochemical gold-plating process forms a uniform and dense gold-plated protective layer on the polished micro needle surface through electrolytic deposition reaction. The gold-plated layer has excellent anti-oxidation, anti-corrosion and lubrication properties, which can prevent stainless steel micro needles from oxidation and rust in long-term use, improve product durability, and at the same time enhance the appearance texture of products, meeting the high-end beauty equipment matching needs.

Equipment Classification

Micro needle surface finishing equipment is divided into polishing equipment, gold-plating equipment and post-inspection equipment to form a complete finishing system. First, mirror precision polishing machines are used for overall finishing of micro needles, eliminating microscopic defects and improving surface smoothness. Second, constant-temperature electrochemical gold-plating equipment realizes uniform electrolytic coating, with controllable coating thickness and stable adhesion. Third, surface cleaning and activation equipment removes polishing residues and surface impurities to ensure tight bonding of gold-plated layers. Fourth, surface defect detection equipment detects polishing scratches, gold-plating unevenness and peeling defects. Auxiliary equipment includes constant-temperature drying equipment, dust-free finishing workbenches and coating thickness calibration instruments to ensure standardized finishing quality.

Operation Guidelines

Standardized finishing operation is the key to ensure stable surface quality of micro needles. Before polishing, fix the formed micro needles on the special fixture to avoid needle tip deformation during polishing. Set graded polishing parameters according to product specifications: ultra-fine micro needles adopt low-pressure fine polishing to protect the needle tip structure; conventional micro needles adopt high-efficiency overall polishing to ensure uniform surface smoothness. After polishing, clean the products thoroughly to remove abrasive residues and surface dust. For gold-plated products, activate the micro needle surface to improve coating adhesion. Set stable electrolytic voltage, temperature and time parameters to ensure uniform and dense gold-plated layer without missing plating and thick-thin deviation. After finishing, conduct full inspection of surface smoothness, coating uniformity and structural integrity. Eliminate products with scratches, peeling, missing plating and needle tip deformation, and store qualified products in dust-free sealed environment.

Practical Industry Experience

High-end micro needle manufacturers adopt differentiated finishing schemes for different product positioning. Mass-market beauty micro needles adopt high-efficiency mirror polishing process to balance cost and use effect, ensuring basic painless and smooth use experience. High-end customized beauty and medical micro needles adopt polishing + thickened uniform gold-plating composite process to improve product anti-oxidation performance and service life. Long-term production practice proves that surface activation treatment before gold-plating can increase coating adhesion by more than 35% and effectively avoid long-term use peeling. Closed dust-free finishing workshops can prevent impurity adhesion and ensure clean and flawless product surface. Strict finishing parameter calibration and batch inspection make the surface finishing consistency of finished products reach 100%, fully meeting high-end market quality requirements.

Summary and Improvement

Polishing and gold-plating surface finishing is an indispensable key process for high-quality micro needle production, which directly determines the use experience, durability and product grade of micro needles. Precision polishing optimizes the surface smoothness of products, realizes painless minimally invasive use effect and avoids residue accumulation. Uniform gold-plating finishing improves the anti-oxidation and anti-corrosion performance of products and extends service life. Standardized finishing processes and strict quality inspection effectively solve common defects such as scratches, uneven coating and peeling, and improve the comprehensive quality of micro needle products.

Future Suggestions

It is suggested to introduce intelligent automatic finishing production lines to realize integrated polishing, cleaning and gold-plating operations, eliminate manual errors and improve batch consistency. Develop nano-level ultra-fine finishing technology to further improve product surface smoothness and reduce skin friction. Optimize environmental protection gold-plating process formulas to reduce production pollution while ensuring coating performance, realize green production, and enhance the comprehensive competitiveness of micro needle products in the high-end market.