Recently I observed some rolls of polyethylene film that were discolored. It brought me back to a time several years ago where I had a roll standing on end in my office underneath an electrical outlet. Plugged into this electrical outlet was a room deodorizer, you know the type that has a scented liquid in them. The sides of the polyethylene rolls had what appeared to be oil on them. My initial reaction was that the deodorizer spilled out on the rolls. I disposed the deodorizer, a couple of days later I noticed the roll had more of this yellow oily liquid on them but in a different location.
What really was happening was that an additive (antistat) was migrating to the surface of the film. This is also known has blooming. In the compounding of this resin a wet antistatic additive was mixed into the master-batch and was not blended into the batch evenly. With time this additive migrated / bloomed to the surface of the film. This issue was overcome by using a dry antistat in the compounding of this polyethylene.
Doug Caillier
General Manager
Multi-Plastics Canada
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