𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐖𝐡𝐲 𝐒𝐨-𝐂𝐚𝐥𝐥𝐞𝐝 “𝐁𝐚𝐫𝐫𝐢𝐞𝐫 𝐅𝐢𝐥𝐦𝐬” 𝐀𝐫𝐞 𝐎𝐟𝐭𝐞𝐧 𝐍𝐨𝐭 𝐏𝐞𝐫𝐟𝐞𝐜𝐭 𝐁𝐚𝐫𝐫𝐢𝐞𝐫 𝐅𝐢𝐥𝐦𝐬
𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 𝐖𝐡𝐲 𝐒𝐨-𝐂𝐚𝐥𝐥𝐞𝐝 “𝐁𝐚𝐫𝐫𝐢𝐞𝐫 𝐅𝐢𝐥𝐦𝐬” 𝐀𝐫𝐞 𝐎𝐟𝐭𝐞𝐧 𝐍𝐨𝐭 𝐏𝐞𝐫𝐟𝐞𝐜𝐭 𝐁𝐚𝐫𝐫𝐢𝐞𝐫 𝐅𝐢𝐥𝐦𝐬 Barrier films based on PA / EVOH / polyolefin structures are designed to deliver excellent oxygen protection, extended shelf life, product safety for food & pharma packaging. On paper, many films claim impressive oxygen transmission rates (OTR). In reality, however, a large number of so-called barrier films fail to deliver consistent barrier performance in real-world conditions. So where does this gap come from? The answer often lies not in the EVOH or PA layer itself, but in the tie layer connecting them. The Hidden Role of the Tie Layer In a multilayer barrier structure, the tie layer is not a passive or optional component. It is a functional polymer whose role is to: Chemically bond polar layers (PA, EVOH) to non-polar polyolefins (PE / PP) Maintain interlayer integrity during: Without proper adhesion, even the b...