RF Sealing

High-frequency packaging (RF Sealing) refers to the technology of using radio frequency (RF) energy to heat-seal plastic films or composite packaging materials, also known as high-frequency heat sealing or RF sealing. The principle is that a high-frequency electric field causes intense friction among molecules inside the material, generating heat, and under pressure, fusion is achieved. It is especially suitable for polar materials such as PVC, PET, and EVA, and is commonly used in packaging for medical devices, personal care products, food, and electronic products that require sealing, moisture resistance, and antibacterial protection. Application scenarios include: packaging for export that must pass seal integrity tests, sterile medical supplies packaging, and sealing of blister shells to paper cards. Precautions: Non-polar materials (such as PE and PP) are generally not suitable for pure high-frequency sealing and should use heat sealing or ultrasonic instead; seal strength and seal integrity must be tested according to standards such as ASTM F88; high-frequency equipment operation requires protection against electromagnetic interference and attention to personnel safety. The difference from ordinary heat sealing lies in the heating method: heat sealing relies on external heat source conduction, while high-frequency sealing relies on the material's own dielectric loss to generate heat, so high-frequency sealing is more uniform and faster, and is suitable for sealing thick or complex shapes; compared with ultrasonic sealing, high-frequency is more suitable for large-area, continuous sealing, while ultrasonic is more suitable for local, small-area sealing.