Since EVOH has an -OH group in its molecular structure, defects (particularly whitening) caused by water absorption occur during retort treatment (e.g., at 121deg C for 30 minutes). The first-generation retort "Soarnol®" developed to eliminate these surface defects had limited processability and was not suitable for long -run processing. At its Processing Technique Development Center, Nippon Gohsei worked to overcome these difficulties and has succeeded in developing the next-generation retortable "Soarnol®" grades. With this improved grades, there are few surface defects even after retort treatment (121℃,30 minutes) and long-run processability has been dramatically improved over the standard grades
Sample applications
Lids for processed rice containers and dessert containers, packaging for boiled wild vegitables, beans, corn, industrial and consumer pouches for soups, sauces, and pastes
Change of Appearance after Retort Treatment
Retort condition: 121deg C-30mins (content is water)
Structure of layer: (PP/Tie/EVOH/Tie/PP)=(10/10/10/10/10)m
Evaluation: Check the transparency of the pouch by placing a black sheet with the word "Clear" in white letters behind the pouch.
Standard "Soarnol®" shows a decrease in transparency due to whitening of the pouch, so the background letters "Clear" cannot be read. With retort "Soarnol®", however, the background letters "Clear" can be read easily.
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