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The development of PTP aluminum foil

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Time of issue:2022-01-20
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(Summary description)Pharmaceutical PTP foils are generally "hard" aluminum. His thickness requirements, contained in the U.S. and global markets, are historically different. In the US, most foils are around 25 microns thick, or 25.4 µm to be precise. In Europe, however, a thickness of 20.0 µm is more common and has a greater length advantage for the same weight of raw material. In recent years, countries have trended towards thinner 20.0 µm aluminium foils regardless of the market. And today, the vast majority of aluminum foils are coated with "universal" heat seal lacquers to ensure a good seal.

The development of PTP aluminum foil

Categories:News
Author:
Origin:
Time of issue:2022-01-20
Views:357

Information

The development of PTP aluminum foil

Pharmaceutical PTP foils are generally "hard" aluminum. His thickness requirements, contained in the U.S. and global markets, are historically different. In the US, most foils are around 25 microns thick, or 25.4 µm to be precise. In Europe, however, a thickness of 20.0 µm is more common and has a greater length advantage for the same weight of raw material. In recent years, countries have trended towards thinner 20.0 µm aluminium foils regardless of the market. And today, the vast majority of aluminum foils are coated with "universal" heat seal lacquers to ensure a good seal.

Early development
Alcan Packaging SINGEN is the first company in the world to produce rigid aluminium foils that are hermetically sealed to uPVC films. The most critical factor for medicinal aluminum foil at the time was allowing oral solid dose tablets to be easily squeezed through the foil.

So for early aluminum foil products, the challenges revolved around developing foils with good tear properties - so that drug tablets could easily "push" out of the foil; and good sealing properties - to achieve the gas needed for product integrity hermetically sealed.

Material properties
The characteristics of aluminum foil for packaging are "hard" or "soft". Soft foils receive additional annealing and any lubricants used during rolling will evaporate.

The application of the protective paint takes place in the first process. Drying (solvent removal) is carried out at high temperature and airflow. The drying heat and airflow also help remove rolling oil from the inside of the material.

Heat seal painting is carried out in the second process. The varnish contains resins that bind the remaining rolling oil and is characterized by good adhesion to the surface. Heat-sealing varnishes are also chosen because of their sensitivity to humidity.

Applications
The development of sealing aluminum foil has evolved into three main forms of blister packaging:

Push-Through (PTP): Used to seal aluminum foil lids to a variety of formable films with the following general structures:
Pre-painted –> Aluminium (hard or soft tempered) –> Heat Seal Coating (HSC)

Peelable: Used to seal foil lids to formable films (usually PVC or PP) with one of the following structures:
Paper –> PET –> Soft Aluminum –> HSC
PET –> Soft Aluminum –> HSC
Paper -> Soft Aluminum -> HSC

Peel/Push: Used to seal foil lids to formable films (usually PVC or PP) with one of the following constructions:
Paper –> PET –> Special Adhesives –> Soft Aluminum –> HSC
PET –> Special Adhesives –> Soft Aluminum –> HSC

Future trends
As the market evolves, lidding films differ in:

1. Type of opening
2. Child protection type
3. Printability (pre-print or online printing)

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Next: The History of Cold Formed Foil

Previous: How to choose a suitable printing method for medicinal aluminum foil?

Next: The History of Cold Formed Foil

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