The Application of feeding bags in high-frequency welding

High-frequency welding technology is mainly used in feeding bag production for bag sealing, pipe connection, and complex structure molding. It achieves a glue-free, high-strength seal through molecular-level fusion, while supporting automated production and complex designs, becoming a core process for improving the safety, reliability, and production efficiency of feeding bags. Specific application scenarios and advantages are as follows:

I. Core Application Scenarios

1. Bag Sealing Welding

Technical Principle: A high-frequency electric field causes polar plastic molecules such as PVC and PE to polarize and generate heat through friction, achieving self-fusion and forming a seamless sealing structure.

Application Effects: Sealing strength reaches over 25N (industry standard ≥15N), with no leakage for 1 minute under negative pressure testing (-80kPa), ensuring long-term leak-free storage of nutrient solutions or medications. The surface is smooth without mechanical indentations, with a roughness Ra <0.8μm, facilitating cleaning and disinfection and reducing the risk of bacterial growth.

2. Pipe Connection and Functional Component Welding

Technical Implementation: Inlet/Outlet Pipe Welding: High-frequency welding achieves a seamless connection between the pipe and the bag body, with a peel strength ≥15N/15mm, avoiding the risk of detachment associated with traditional adhesive bonding.

Leak-proof Valve Integration: Leak-proof valves made of silicone or thermoplastic elastomer (e.g., cross-cut shape) are directly welded to the inside of the connecting pipe, eliminating the need for additional assembly steps and improving production efficiency.

High-Temperature Alarm Fixation: Temperature sensors (e.g., bimetallic strip sensors) are welded to the outside of the connecting pipe to monitor the feeding medium temperature in real time. An audible alarm is triggered when the temperature exceeds the limit to prevent burns.

3. Complex Structure Forming

Three-Dimensional Welding Capability: Precision welding of irregularly shaped interfaces (e.g., multi-channel connectors, 3D standing bags) is achieved through contoured electrode design.

Multi-Layer Composite Welding: Supports uniform fusion of multi-layer composite materials such as PE/AL/NY, meeting high barrier requirements (e.g., prevention of gas penetration, UV aging), extending the nutrient solution storage period to over 18 months.

Case Study: A company utilizes high-frequency welding technology to produce transparent feeding bags with graduated markings. The markings are integrally molded with the bag body, minimizing monitoring errors. Furthermore, a co-extrusion molding process integrates the anti-fog and antistatic layers, enhancing clinical usability.

II. Summary of Technical Advantages

1. Enhanced Safety

No glue residue or mechanical indentations reduce the risk of infection; high sealing strength prevents nutrient solution leakage. Integrated leak-proof valve and high-temperature alarm reduce spillage and burn risks during feeding.

2. Optimized Production Efficiency

High single-station speed, supporting multi-station rotary production, resulting in high daily capacity. Excellent flexible production capabilities allow for rapid process switching between different feeding bag sizes, supporting mass customization.

3. Expanded Design Freedom

Supports welding of complex structures (such as irregular interfaces and multi-layer composite materials) to meet personalized medical needs. Wide range of weldable materials, including PVC, PE, and TPU, aligning with the trend of biodegradable material applications.