Electron-beam irradition and modification of large molded polyethylene containers

Electron-beam radiation cross-linking of large rotomolded polyethylene drums and lids, used as overpacks in chemical waste disposal, results in enhanced impact properties as determined by standardized drop-test methods. Improved performance provides for expanded utility and reliability. Background chemistry and data describing interrelationships between radiation dose, gel, and product performance are provided. Radiation distribution over such large structures has been problematic in the past. Based on gel analyses from model rectangular molded boxes, large, complex structures must be oriented, reconfigured, or manipulated under the accelerator beam in order to assure even and sufficient levels of cross-linking. Examples are provided along with related process economic comparisons between electron beam irradiation for cross-linking rotomolded drums and alternative techniques using peroxides