Blister packaging is a widely used form of packaging that consists of a clear plastic cavity or blister that holds a product and is sealed with a backing material, typically made of cardboard, aluminum foil, or plastic. Blister packaging offers several benefits, including product visibility, tamper resistance, and protection against moisture, light, and physical damage. The choice of blister packaging materials depends on various factors, such as the product’s nature, shelf life, and required barrier properties. Here are some common types and characteristics of blister packaging materials:
- PVC (Polyvinyl Chloride):
- PVC is a popular choice for blister packaging due to its excellent clarity, forming properties, and cost-effectiveness.
- It provides good moisture and oxygen barrier properties, protecting the product from external factors.
- PVC blister packaging is commonly used for consumer goods, pharmaceuticals, and medical devices.
- PVDC (Polyvinylidene Chloride):
- PVDC-coated films, such as PVC/PVDC, offer enhanced barrier properties compared to PVC alone.
- They provide improved resistance to moisture, oxygen, and other gases, ensuring product stability and shelf life.
- PVDC blister packaging is commonly used for sensitive pharmaceuticals and products that require extended protection.
- PET (Polyethylene Terephthalate):
- PET is a transparent and lightweight material with good barrier properties against moisture, gas, and light.
- It is commonly used in blister packaging for food items, electronics, and consumer goods.
- PET offers excellent product visibility and is recyclable, making it an environmentally friendly option.
- Aclar (PCTFE):
- Aclar is a high-performance film known for its exceptional barrier properties, including resistance to moisture, oxygen, and chemicals.
- It provides excellent clarity and can be thermoformed into blister cavities.
- Aclar blister packaging is commonly used for pharmaceuticals and medical devices that require stringent protection.
- Aluminum Foil:
- Aluminum foil is often used as a backing material in blister packaging due to its excellent barrier properties.
- It offers high resistance to moisture, oxygen, light, and other external factors.
- Aluminum foil provides a strong barrier for pharmaceuticals, food products, and other sensitive items.
- Coextruded Films:
- Coextruded films are multilayer structures made by combining different polymers to achieve specific properties.
- These films can be tailored to provide desired barrier characteristics, such as moisture resistance, oxygen barrier, or UV protection.
- Coextruded films are used in various blister packaging applications, including food, electronics, and consumer goods.
When selecting blister packaging materials, it is crucial to consider the product’s compatibility, regulatory requirements, and the desired shelf life. Additionally, factors like recyclability, sustainability, and cost-effectiveness are also gaining importance in material selection decisions.