Flame Treatment

Why Do Empty Plastic Shampoo Bottles Split at the Base Lines? Reference Standard: ASTM D1693 (Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics) and ISO 22015 (Packaging — Functional requirements and testing for cosmetic packaging systems). Short Answer Empty plastic shampoo bottles split at their base corners due to crystallite orientation mismatches created during extrusion blow molding, which lock in high non-isotropic residual stresses along the mold parting lines. When stored or stacked, these mechanical stress fields concentrate and cause spontaneous structural cracking, while low surface free energy leads to permanent ink matrix delamination under hydro-kinetic fluid shearing. Crystallite Orientation Fields: The Distribution of Elastic Recovery in Mold Parting … 続きを読む