Meaning
Chemical degradation of organic polymers occurs when reactive oxygen species attack molecular bonds. The process of free radical oxidation is a primary cause of paperboard yellowing and loss of strength over time. This reaction must be controlled to preserve packaging shelf life.
Substrate Aging
High-energy light and heat initiate chemical chain reactions that break down cellulose fibers in the paperboard. As free radical oxidation progresses, the board loses its stiffness and becomes brittle, which can lead to structural failure of the folding carton during handling. This degradation also causes a yellowing of the board’s surface, ruining the aesthetic appeal of the printed graphics.
Packaging Protection
Barrier coatings and chemical additives are applied to the packaging board to shield it from environmental factors. To prevent free radical oxidation in the fiber matrix, board manufacturers often incorporate antioxidant additives or protective clay coatings. This protection ensures that the packaging remains structurally sound and visually appealing throughout its journey from the warehouse to the retail shelf.
Supply Specification
Procurement contracts for long-term storage cartons usually contain clauses specifying the material’s resistance to environmental degradation. In these agreements, suppliers must prove that their board can withstand free radical oxidation over a specified period without losing structural integrity or shifting in color. Testing protocols simulate accelerated aging to verify compliance, and failure to pass these tests allows the buyer to cancel the supply contract without penalty, ensuring that the brand is protected from premature product deterioration.
