Plastic film is used in pharmaceutical blister packaging, the industry requirements have always been very strict, not only to be thin, but also have sufficient barrier properties, easy to tear but not easy to crack and high transparency, drugs at a glance, etc., so pharmaceutical companies are choosing blister Be very cautious when packing materials.
The most commonly used medical blister packaging materials have been polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC). At present, due to the lack of polarity of the molecules, polypropylene does not cause the bonding of PVDC and metal production equipment, and the processing performance is much better than PVC and PVDC, which is becoming the new favorite of blister packaging materials.
China's pharmaceutical packaging market has developed rapidly, with an annual growth rate of about 14%. Many packaging products have begun to be produced and processed in China. The world trend in the development of pharmaceutical packaging is that the mainstream packaging of 100 capsules per bottle is getting worse and smaller, and it is replacing it with blister packaging.
It is understood that the blister packaging uses PVC, mainly because of its good compatibility, easy molding, good sealing and low price, but PVC thermal stability is poor, moisture barrier is also low. The PVDC membrane is the best barrier film. It can be used under high temperature and high humidity conditions. Its performance is similar to PVC and it is more widely used than PVC.
However, with the rapid development of packaging technology and the pharmaceutical industry, the shortcomings of PVC and PVDC continue to emerge. For example, PVC has poor water vapor barrier properties and is difficult to meet higher production requirements, while PVDC processing performance is also not satisfactory. As a result, some plastic and pharmaceutical packaging manufacturers have developed blister packaging plastics that can compensate for the above two properties. Polypropylene is one of the more popular materials in the market. During the calendering process, the tensile strength of the polypropylene sheet is greatly reduced. Because the internal crystal is small, if the quenching technology is used, the plastic can be prevented from being in a high elastic state. Due to this property, polypropylene overcomes the shortcomings of PVC and PVDC, so it is becoming the best choice for blister packaging materials.
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