In order to increase the oxygen and carbon dioxide barrier properties of PET, PP and HDPE food bottles, the three companies Owens-Illinois, M&G Polymers USA and PPG Industries announced some of their progress.

OI`s Plastics Group (Toledo City, Ohio) developed a new grade of SurShot (an inert-barrier multilayer system) with anti-delamination capabilities for the preparation of PET and polyolefin bottles. Delamination is most likely to take place on the container where embossing or intarsia occurs. In response to this situation, OI reconstituted its materials to make the layers more strongly bonded to each other. In addition, OI worked with Husky Injection Molding Systems (Bolton, Ontario, Canada) to make the Surshot system suitable for Husky's new 144-cavity pre-injection mold. The breakthrough of this technology is to successfully control the thickness of the barrier layer in such a multi-cavity mold.

Houston-based M&G has just launched ActiTuf barrier resin in the United States. This is an active-inert barrier system that increases the shelf life of foods in PET bottles. In Europe, it has been used to make beer bottles. Preform of the bottle can be completed on ordinary instruments, and the production volume will not be reduced. ActiTuf's price per pound is slightly more expensive than regular PET.

PPG Corp. (Milford, Ohio) introduced a new material with higher barrier properties that needs to be sprayed onto PET, HDPE, and PP bottles to form a barrier coating. This material is called Bairocade HP. Compared with old materials, it can reduce the bottle wall thickness by 40%, while the bottle's oxygen and carbon dioxide barrier properties are the same as those of old bottles. And, the new material coating can also be washed off when the bottle is recycled.

Source: Foreign Plastics

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