WHAT ARE GELS AND HOW TO REDUCE THEM

摘要

Gels are a common quality problem in plastic films. Gel formation in polyolefin film is a phenomenon that is difficult to predict, reproduce and solve. 1 Gels are not only an aesthetic concern, but also could affect bag integrity and raise concerns of extractables/leachables in biopharmaceutical industry. Gels could be caused by un-melted resins, cross linked/oxidized polymers, additives, air bubbles, moisture and foreign contaminates. It is important to identify the root cause of gels and take appropriate actions to reduce them. If the wrong counteraction is applied, the problem can intensify.