The composite bonding link of medical dressings and food packaging has strict requirements for food/medical grade compliance, bonding stability, and scene adaptability of adhesive films, and high-grade SEBS/POE composite films have become the core materials in this field due to their environmental protection and non-toxicity, good bonding effect, and strong performance adjustability.
1. Key points of formulation for flexible application scenarios
It is suitable for medical dressing skin layers, food packaging heat sealing films, and thin pipeline sealing films, and the core requirements are high softness, fit and moldability. SEBS selects linear, low-styrene, and high-fluidity medical-grade grades to ensure skin comfort, while meeting the processing and molding requirements of thin films to avoid stiffening of adhesive films. POE is paired with a medical-grade grade with low melting fingers to strengthen the flexibility of the film and the stability of the heat seal, preventing damage and missing sealing problems during the heat sealing process.
2. Key points of formulation for thick-walled pressure-bearing application scenarios
It is suitable for medical pipeline joint sealing film, pharmaceutical packaging material sealing layer, and food packaging composite film, and the core requirements are high bond strength, pressure bearing and sealing. SEBS selects star-shaped, low-styrene, and low-flow medical-grade grades to improve the rigidity and sealing performance of the film, resist the deformation caused by pipeline pressure and packaging stacking, and avoid seal failure. POE is paired with a high-melt medical-grade grade to enhance melt adhesion, ensure a tight fit of the thick-walled layer, and eliminate problems such as leakage and delamination.
3. General core requirements
Food/medical grade compliance grades are selected throughout the process to strictly control the residues of harmful substances and meet industry safety standards.
In both scenarios, an appropriate amount of compatibilizer needs to be added to improve the compatibility between SEBS and POE and prevent film delamination.
The medical scene additionally optimizes the air permeability of the film, and the food packaging scene focuses on improving temperature resistance, adapting to subsequent sterilization, warehousing and other links.