Cosmetic Manufacturing

Why LDPE Squeeze Bottles Crack: Surface Physics & ESCR

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Why Is Your Cosmetic Squeeze Bottle Peeling or Cracking? Reference Standard: ASTM D1693 ESCR Protocol / ISO 9001:2015 Short Answer Small Squeeze Containers often fail due to low surface free energy, causing ink delamination, or environmental stress cracking (ESCR) induced by surfactants. Professional manufacturing utilizes in-line flame treatment to raise surface energy above 38 dynes/cm and high-branched LDPE resins to absorb mechanical strain without crystalline disruption. Interfacial Free Energy and Electron Transition Models for Ink Adhesion The aesthetic failure of Small Squeeze Containers—specifically the frustrating peeling of silk-screened logos or labels—is rooted in the fundamental surface physics of Polyethylene. LDPE is a non-polar polymer with a naturally low surface free … 続きを読む

Why Squeeze Bottles Leak? Fixing PE Stress Cracking Failures

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Why Do Travel Squeeze Bottles Leak? Fixing Stress Cracking Failures Reference Standard: ASTM D1693 (Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics) Short Answer Refillable squeeze bottles frequently fail due to Surfactant-Induced Solvent Swelling (SISS) and poor ink adhesion. Aggressive surfactants in personal care formulas infiltrate the Polyethylene (PE) matrix, weakening intermolecular Van der Waals forces and triggering environmental stress cracking under mechanical squeeze pressure. Furthermore, the naturally low surface energy of PE repels printing inks, causing branding to peel in humid environments unless the substrate undergoes thermo-oxidative surface activation. Surfactant-Induced Solvent Swelling: The Silent Rupture of PE Matrices To understand why a seemingly durable travel size squeeze bottle … 続きを読む