MGC: Gas Barrier Technologies, leading global provider of gas barrier plastics & technologies

Recommended Grades: S6007, S6007AD (anti-delamination)

Nylon-MXD6 is being used for PET bottle applications, both multilayer and blend, worldwide. Because of its processability, recyclability, moderate adehesion to PET layer and total cost, Nylon-MXD6 is your best choice as a barrier material in PET bottle applications for tea, juice, carbonated soft drinks or beer.

The gas barrier property of PET bottles are efficiently improved with Nylon-MXD6 content, in both a multilayer bottles or blend bottles.

Fig. 1 Oxygen transmission rate of PET/Nylon-MXD6 multilayer and blend bottle Bottle: volume 500 cc, average wall thickness 350 mm Storage condition: 23 Deg. C., inside 100 %RH, outside 50 %RH

Fig. 2 Carbonation retention of PET/Nylon-MXD6 multilayer bottle Bottle: volume 500 cc, average wall thickness 350 mm Storage condition: 20 Deg. C., inside 100 %RH, outside 65 %RH

Table 1 Example of processing condition for co-injection/injection of PET/Nylon-MXD6 multilayer/blend preform

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It is not necessary to dry when you use Nylon-MXD6 (Grade S6007) just after opening the damp-proof bags, because the pellets are dried enough for the processing. In case the pellets have got moisture by exposing in atmosphere for a long time, it is necessary to dry under vacuum condition. In this case, the suitable drying conditions are at 120 to 140 Deg. C., in below 2 mmHg, for 4 to 5 hours. If Nylon-MXD6 is dried in the conventional dryer, such as the hopper dryer for PET, N-MXD6 would turn yellow.

Fig. 3 Example of drying system for Nylon-MXD6 in the production of PET multilayer preform

Fig. 4 Example of drying system for Nylon-MXD6 in the production of PET blend preform

Fig. 5 Relation between yellowness index and drying time Material: Nylon-MXD6 (Grade S6007) Dryer: Dehumidifying hopper dryer, dew point -50 Deg. C.

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