Technology Casts the Soul, Carefully Protects Freshness and Mellow Taste — Metal Square Mint Tin, with "technology as the core, freshness preservation as the mission and quality as the foundation" as its core positioning, based on the storage pain points of mint being easy to get damp, oxidize and lose taste, relies on cutting-edge metal processing technology, sealed freshness preservation technology and refined control technology, integrates professional technology into the whole process of product R&D, production and testing, breaking the dilemma of traditional mint packaging such as "poor sealing, weak freshness preservation and easy damage". It creates a metal square mint tin box with sealed freshness preservation, sturdiness and durability, and convenience, adapting to the packaging needs of various mint products such as mints, mint tablets and mint ingots, covering diverse scenarios such as supermarket retail, brand customization, gift giving and daily carrying, becoming a technical benchmark for mint product packaging. We adhere to the core concept of "technology empowers quality, details protect freshness and mellow taste", have been deeply engaged in the R&D and application of metal square mint tin technology for many years, integrate top technical resources in the industry, optimize technical processes, iterate technical processes, and strengthen technical control, ensure product quality with professional technology, solve mint storage problems with core technology, meet the core needs of different customers for the freshness, durability and convenience of mint packaging, and show technical strength and product value.

　　Material Technology: High-End Metal Selection and Special Treatment Technology, Laying a Solid Foundation for Quality. Adopt special metal materials suitable for mint storage needs, combined with cutting-edge material treatment technology, balancing freshness preservation, durability and safety, ensuring the storage quality of mint products from the source. All material technologies meet international food packaging safety standards and are suitable for food-grade packaging needs. The main material is food-grade tinplate and 304 stainless steel composite material. Through material composite technology, it achieves three advantages of "rust resistance + sealing + light weight". The thickness of tinplate is accurately controlled at 0.28-0.32mm, the thickness of stainless steel layer is 0.08-0.1mm, the material purity is ≥99.7%, the tensile strength is ≥510MPa, and the yield strength is ≥200MPa. It not only has the processability of tinplate, but also has the super rust resistance of stainless steel, adapting to the dry needs of mint storage. Adopt double rust prevention technology: first, phosphating treatment to form a dense protective film, then environmental protection spray coating treatment, the salt spray test can reach 150 hours, which is not easy to oxidize and rust even in humid environment, extending the service life of the product; At the same time, adopt chrome-free passivation technology, no harmful residues and no excessive heavy metals, lead content ≤0.001mg/kg, cadmium content ≤0.0005mg/kg, meeting the EU food contact material safety standard (EC 1935/2004), which can directly contact mint products without affecting the taste and quality of the products. In addition, adopt surface matte treatment technology to avoid mint oxidation caused by metal reflection, and at the same time improve the delicate touch, scratch-resistant and wear-resistant, adapting to daily carrying and bulk transportation scenarios.

　　Forming Technology: High-Precision Square Forming Technology, Balancing Regularity and Structural Stability. Relying on intelligent CNC forming technology, break through the technical bottleneck of square structure being easy to deform and irregular corners, create a precise, stable and regular square shape, ensure the uniform size and stable structure of each metal square mint tin box, adapting to the regular storage and bulk packaging needs of mint products. Adopt one-piece stamping forming technology, equipped with high-precision CNC stamping machine, stamping accuracy is controlled within ±0.005mm, stamping pressure is stable at 70-90MPa, ensuring that the length, width and height error of the square tin box is ≤±0.01mm. The four corners adopt precise folding technology, the folding angle is controlled at 90°±0.5°, and after 4 rounds of refined polishing technology, a round and smooth arc is presented, which not only avoids the potential safety hazard of sharp corners, but also enhances the stability of the overall structure. Adopt seamless welding technology, welding temperature is controlled at 1700-1900℃, welding joint width ≤0.06mm, welding strength ≥470MPa, no welding beads, no gaps, no oxidation, ensuring the overall sealing of the tin box and preventing air and moisture from infiltrating; At the same time, adopt shaping and calibration technology to accurately calibrate the formed tin box, ensuring that the box body is flat, no skew, no unevenness, strong structural pressure resistance, and can withstand 45N pressure without deformation, adapting to the needs of bulk stacking, transportation and long-term storage. Aiming at the light weight demand of mint packaging, adopt thin material forming optimization technology, on the premise of ensuring structural stability, control the weight of a single tin box at 60-100g, which is easy to carry and use, balancing practicality and convenience.

　　Sealed Freshness Preservation Technology: Core Technology Empowerment, Protecting the Fresh and Mellow Taste of Mint. Focusing on the core pain points of mint being easy to get damp, oxidize and lose taste, integrate multiple sealed freshness preservation technologies to create a comprehensive sealed freshness preservation system, effectively isolating air, moisture, light and peculiar smell, extending the shelf life of mint products and protecting their natural fresh and mellow taste, which is also the core technical advantage of the metal square mint tin box. Adopt double sealing technology, the box cover and box body adopt precise fitting design, matched with food-grade silicone sealing ring. The sealing ring adopts high-temperature vulcanization molding technology, thickness 0.22-0.28mm, Shore hardness 58-68 degrees, odorless, non-aging and strong sealing, the fitting degree with the box body reaches 99.9%, air leakage rate ≤0.008%/24h, which can effectively isolate air and moisture, preventing mint from getting damp and soft, oxidizing and discoloring. Adopt light-shielding protection technology, the inner wall of the tin box adopts matte light-shielding coating technology, coating thickness 0.03-0.04mm, light-shielding rate ≥99%, which can effectively block ultraviolet rays and light irradiation, avoiding the loss of components and poor taste of mint caused by light; At the same time, adopt moisture-proof adsorption technology, the box is built with food-grade moisture-proof desiccant, through slow-release adsorption technology, continuously absorb moisture in the box, maintain a dry environment in the box, the relative humidity is controlled at 30%-40%, further improving the freshness preservation effect. In addition, adopt anti-odor penetration technology, the inner wall of the tin box is specially passivated to form a dense protective layer, which can effectively block the penetration of external odors, and at the same time prevent the loss of mint's own aroma, ensuring that mint can still maintain its natural fresh and mellow taste after long-term storage, and the shelf life can be extended to 12-18 months, far exceeding the freshness preservation time of traditional mint packaging.

　　Printing and Testing Technology: Refined Control, Ensuring Both Quality and Appearance. Relying on high-end printing technology and strict testing technology, balance product appearance and quality stability, ensuring that each metal square mint tin box meets the standards, adapting to brand customization and retail scenarios. The printing technology adopts environmental protection screen printing and gold stamping composite technology, screen printing accuracy ≥450dpi, using food-grade environmental protection ink, no harmful volatile substances, uniform printing color, clear patterns, no blurring, no missing printing, not easy to fade, color adhesion ≥4.5 levels, which can present complex brand logos, patterns and texts, adapting to brand customization needs; The gold stamping technology adopts precise temperature control gold stamping process, gold stamping temperature 110-130℃, gold stamping pressure 0.25-0.45MPa, full color and outstanding texture, improving the high-end style of the product. The testing technology adopts a full-process intelligent testing system, covering four links: material testing, forming testing, sealing testing and printing testing: material testing adopts a spectrum analyzer to accurately detect material composition and heavy metal content, and unqualified materials are strictly prohibited from entering the factory; Forming testing adopts intelligent visual inspection equipment, with a detection accuracy of 0.001mm, automatically identifying problems such as dimensional deviation, corner burrs and structural deformation; Sealing testing adopts a negative pressure sealing tester to simulate the sealing performance in different environments to ensure that the sealing meets the standard; Printing testing adopts a color difference meter to detect color deviation ≤△E1.2, ensuring consistent printing effect. The qualified rate of full-process testing is 99.95%, comprehensively ensuring product quality, making each metal square mint tin box have both appearance and quality.

　　Mass Production Technology: Efficient and Intelligent, Adapting to Large-Scale Needs. Relying on intelligent mass production technology, optimize the production process, improve production efficiency, realize large-scale and standardized production of metal square mint tin boxes, meet the bulk purchase needs of different customers, and balance production efficiency and product quality. Adopt a fully automatic production line, equipped with intelligent CNC stamping machines, automatic welding robots, intelligent printing machines, automatic testing equipment, etc., realizing the whole process of automatic production from raw material processing, forming, welding, printing, testing to delivery. The production efficiency is increased by more than 80% compared with the traditional production line, and the production time of a single product is shortened to 0.8-1.1 minutes. Adopt digital production control technology, build a production management system, real-time monitoring of core indicators such as production progress, equipment operation status and product quality, which can accurately adjust production parameters, timely find and solve technical problems in the production process, ensuring the stability and consistency of mass production. Adopt mass customization adaptation technology, which can flexibly adjust the production plan according to the customer's bulk order needs, adapting to the customization needs of different sizes, specifications and printing patterns. The mass customization cycle is shortened to 7-15 days, and it can undertake bulk orders of 100-100,000 pieces. At the same time, provide exclusive technical docking services to ensure that the customized products meet the customer's technical requirements, balancing mass production efficiency and personalized needs, empowering bulk supply with technology, and helping customers reduce purchase costs and improve supply efficiency.