Meaning
The chemical breakdown of ethylene vinyl alcohol copolymer occurs when the material is exposed to excessive heat or moisture during processing. This phenomenon, known as EVOH degradation, reduces the gas barrier performance of coextruded packaging films. The loss of barrier properties allows oxygen to penetrate the package.
This breakdown shortens the shelf life of the enclosed product.
Processing Risk
Controlling melt temperature and dwell time in extrusion machinery is essential to prevent polymer decomposition. During the coextrusion process, incorrect temperature profiles can trigger EVOH degradation, leading to the formation of gel particles or black spots in the film. These defects not only ruin the appearance of the packaging but also create structural weak points.
Manufacturers must optimize their equipment settings to avoid these costly processing errors.
Distribution Liability
Compromised barrier performance in commercial packaging exposes distributors to financial losses from product spoilage. If EVOH degradation goes unnoticed at the factory, the resulting packages may fail during shipment or while on retail shelves. This failure can lead to widespread product recalls and damage claims from retail partners.
Suppliers are typically held liable under distribution contracts for any losses resulting from such packaging defects.
Shelf Protection
Preserving the quality of food and medical products requires a reliable and stable barrier layer. When EVOH degradation is prevented, the copolymer maintains its high resistance to gas permeation, ensuring that sensitive contents remain uncontaminated. This stability is especially necessary for products with long distribution cycles or those stored in high-humidity environments.
Investing in high-quality resin and precise processing controls yields a more reliable package and reduces long-term liability. Retailers are more likely to partner with brands that can demonstrate verified quality metrics in their packaging supply chains.
