Barrier-type plastic bottle technology development "a hundred schools of thought contend"

Nanocomposites are a relatively new choice for barrier type bottles. One of these is the Imperm nanoclay/MXD6 nylon blend, used as a barrier layer in multilayer PET bottles. Imperm, developed by Mitsubishi Gas Chemicals and nanoclay supplier Nanocor, is said to have greater oxygen and CO2 barrier than pure MXD6 nylon. It is being commercialized in Europe in 350cc bottles for flavored alcohol beverages.

Deoxygenation technology is also continuing to develop. Valspar has developed a series of thermoplastic oxygen scavenging materials, called Valor, which is compatible with single or multi-layer barrier type bottles. Valspar develops 0.5 liters of juice, beer and food bottles. An important attribute of this material is its dewetting wet activation compared to other barrier materials such as MXD6 nylon and its excellent resistance to delamination in multi-layer applications. Valor materials also retain oxygen removal performance under high temperature and humidity conditions (32°C and 90% relative humidity).

Valorf materials come in three grades: one for single layers and two with active or passive barrier properties for use in multilayer carbonated soft drinks and beer bottles.

Gaotai Co., Ltd. and Australian material development company Steripak Co., Ltd. have developed yet another new type of polymerization additives that can improve the delamination resistance of multilayer bottles. Because the specific surface area is extremely high (about 100,000 times per gram of surface area compared to nylon powder), it is called "irregular fractal polymer" and it is also porous. Both of these factors contribute to the ease with barrier nylon resins. mixing. In the molding machine, this additive was added to the MXD6 material in an amount of 2.5%. It significantly reduces delamination, without loss of barrier performance, and broadens the processing window. In a 6-foot drop test, pure MXD6 nylon showed 20% delamination, while the additive-enhanced MXD6 did not delaminate. The additive is sold in Europe and America by Gaotai.

Holliwell claims that its Aegis MXD6 barrier material for multi-layer containers has better delamination resistance than competing products. The company offers three products for beer, carbonated soft drinks and hot fill products. Two of the three (for beer and hot-fill products) incorporate an active purification system.

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