High-frequency welding technology for medicine bags: Building a solid safety defense line for medicine packaging

I. Principle and Core Advantages of High-frequency Welding Technology High-frequency welding (also known as high-frequency heat sealing) utilizes the principle of high-frequency electric field heating. Through an electronic tube self-excited oscillator, a high-frequency electromagnetic field is generated, polarizing the molecules of the medicine bag material (such as PVC, PET, PE and other plastic films) and causing them to rub against each other to generate heat. Under the pressure of the mold, the material partially melts to achieve a firm connection. This technology has three core advantages:

1. High efficiency and precision: short welding time, suitable for mass production.

2. Strong material adaptability: can process pure PVC or composite materials containing more than 30% PVC (such as PVC/PE, PVC/aluminum foil), and can even weld thinner films to meet the needs of precision medical packaging.

3. Excellent sealing: by precisely controlling temperature and pressure, the weld strength is high, effectively preventing drug leakage and external contamination.

2. Key application scenarios of high-frequency welding in drug bag production

1. Large-capacity infusion bag welding

The three-time welding process is adopted: the first welding forms a preliminary seal, the second welding enhances the edge strength, and finally the overall seal is completed by pulse heating.

2. Special drug packaging

For drugs that need to be protected from light or moisture, high-frequency welding can achieve seamless combination of multi-layer composite materials.

3. Rapid production of emergency medicine bags

The rapid response characteristics of high-frequency welding make it the preferred process for emergency medicine bags.