Ingenious Construction, Craftsmanship Empowerment — Big Tin Pencil Case, with full-process refined production technology as its core, integrates multiple core processes such as base material pre-treatment, precision stamping, seamless welding, fine polishing and surface decoration. It combines the practical capacity and quality texture of large pencil cases, adapts to the needs of students, office, storage and other scenarios, and becomes a high-quality tin stationery of choice with both practicality and durability. We specialize in the R&D and production of large tin pencil cases, adhering to the concept of "craftsmanship creates quality, details win reputation". Relying on intelligent production lines and a professional craft team, we have built a full-process production technology control system. From raw material entry to finished product delivery, every process is strictly controlled and pursued for excellence, creating each high-quality and attractive large tin pencil case with standardized and refined production technology.

　　Base material pre-treatment process builds a solid foundation for production. High-specification cold-rolled iron plate is selected as the core base material. According to the load-bearing and durability needs of large pencil cases, the thickness of the base material is accurately controlled between 0.28-0.35mm. It first undergoes double environmental protection processes of high-temperature rust removal and chrome-free passivation to completely remove impurities, oxide layers and burrs on the surface of the base material, eliminate the hidden danger of rust, and at the same time improve the toughness of the base material and the adaptability of subsequent processes. It meets the environmental safety standards for stationery products, has no harmful residues, and can directly contact various stationery. The pre-treated base material is finely leveled to ensure a smooth surface and uniform texture, providing a solid foundation for subsequent stamping and welding processes, and ensuring the durability and safety of large tin pencil cases from the source.

　　Core forming process creates a regular and practical shape. Adopting automatic precision stamping technology, equipped with customized large pencil case stamping dies, the mold precision is controlled within 0.02mm, and the stamping force, stamping speed and shaping angle are accurately controlled to complete the stamping and forming of the pencil case body, cover and internal compartments at one time. It ensures that the box body is regular and square, the edge lines are straight and smooth, no skew, no creases, no defects, and the internal compartments are of precise size, adapting to the classified storage of various stationery such as pencils, fountain pens and erasers, fully meeting the capacity needs of large pencil cases. After stamping and forming, seamless welding technology is adopted to precisely weld the corners, joints and compartment connections of the box body. The welding joint is flat and smooth, no welding bead, no gap, which not only improves the structural sturdiness of the box body, but also eliminates sharp protrusions, taking into account the use safety and overall texture.

　　Detail processing and surface technology, balancing texture and appearance. After welding, comprehensive fine polishing technology is carried out, and the corners, joints and compartment edges of the box body are polished and polished many times to ensure a smooth and delicate surface, no burrs, no sharp edges and corners, comfortable hand feel and safer use; the surface decoration technology supports diversified customization, and processes such as screen printing, film coating, gold stamping and embossing can be adopted to print cartoon patterns, logos, texts, etc. The ink is environmentally friendly soybean ink, which is full in color, strong in adhesion, not easy to fade and free of harmful residues, which not only meets the aesthetic needs of stationery products, but also shows the product style. Each batch of finished products undergoes comprehensive process inspection, screening layer by layer from shape accuracy, welding quality, polishing effect to surface decoration adaptability, with a finished product qualification rate of more than 99.9%. With full-process refined production technology, it empowers the quality and value of large tin pencil cases, becoming an ideal choice for office and study storage.