How are blister packs packaging sealed?

Blister pack packaging is typically sealed using several methods, depending on the materials involved and the specific requirements of the product. Here are some common sealing methods:

1. Heat Sealing: This is the most common method for sealing blister packs. It involves using high heat and pressure to bond the blister cavity (usually made of plastic) to a backing material like a paperboard or aluminum foil. The heat activates a heat-seal coating on the backing material, creating a strong seal.
2. Cold Sealing: Some blister packs use cold sealing, which does not require heat. This method involves using adhesive-coated materials that bond together under pressure. It’s often used for products sensitive to heat.
3. High-Frequency Welding: This method employs electromagnetic fields to generate heat within the materials themselves, causing them to bond. It’s suitable for certain types of plastics and can create very strong seals.
4. Ultrasound Sealing: Though less common, ultrasound sealing uses high-frequency sound waves to generate heat and seal the materials together. It’s useful for precision applications1.

Each method has its own advantages and is chosen based on the product’s specifications, the materials used, and the desired production speed and efficiency.