New High Barrier Packs from Tetra Pak.
The first of these is Glaskin, a proprietary technology that coats the inside of blown PET bottles with a crystal clear glass-like layer of silicon oxide. The second is Sealica, which is also a proprietary technology, using a patented overlay process to injection-mould a high barrier polymer layer on to PET performs. This barrier material is a thermoplastic epoxy resin that is supplied through a strategic alliance between Tetra Pak and The Dow Chemical Co. We understand Dow are to sell this barrier material under the trade name Blox Resins.
In customer shelf-life tests, Glaskin has been shown to have good oxygen and carbon dioxide barrier properties. Because Glaskin is inert in contact with food, the potential for scalping and flavour absorption is also greatly reduced when compared with other barrier PET solutions, they tell us. Glaskin is inside the bottle so the risk of damage to the barrier during transport is eliminated, allowing the pack to achieve its maximum shelf-life potential for each product.
Sealica can be varied in thickness, to give the final bottle as much or as little barrier potential as required. This system makes use of specialized equipment to first injection-mould a PET preform and then, on the same platen, over-inject a single layer of the proprietary Blox material.
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|Publication:||Food Trade Review|
|Article Type:||Brief Article|
|Date:||Jan 1, 2000|
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