The German flexible packaging and foil converter company maintains that the use of Aclar in the field of blister packaging has only been possible if the film was combined with PVC on the inner surface. However, the consequence of this has been cross migration in the sealing area, leading to a reduction in the barrier properties of Aclar.
The new heat sealing lacquer remedies this problem, claims Hueck Folien. Together with Honeywell, the German firm has developed a lacquer with which sealing can be carried out directly against Aclar-In, a variant of the Aclar product.
Asclar-In is an inverted version of the Aclar film laminates which moves the barrier layer of Aclar film to the inside of the blister, and is claimed to improve packaging moisture barrier performance by 10 to 15 per cent or more, compared with traditional Aclar laminates
The new lacquer "enables pharmaceutical manufacturers to fully benefit from the high barrier properties of Aclar," said Hueck Folien in a statement.
Similar to the standard lacquers from the company for heat-sealing against PVC/PVdC and PP, the new development offers a wide sealing range from 180 °C to 250 °C. This means that the lacquer can be optimally processed on all types of machines, either using platen or roller sealing and at high speeds. Furthermore, the material is suitable for in-line printing.
Moreover, the new heat-sealing lacquer against Aclar-In meets all pharmaceutical requirements. It is approved under CFR 175.300 for the inner surface, and thus for direct product contact, and is listed by the FDA under Hueck Folien's DMF 7273 Drug Master File.
The firm said it is already supplying aluminium foils with the new heat-sealing lacquer to reputable pharmaceutical manufacturers.