The smooth vacuum coil is made of high barrier and high-quality materials, suitable for use in all industries including food, medical, electronics, industry, agriculture, and chemical. The roll surface is smooth and flat, with excellent sealing performance, strong ability to block water vapor and oxygen, effective moisture and oxidation prevention, and freshness preservation. Self made packaging bags can be cut as needed, with good flexibility, puncture resistance, and not easily damaged. They are suitable for large-scale packaging, vacuum sealing, and long-term warehousing and transportation, and have high cost-effectiveness across multiple industries.