A blister pack is a type of packaging commonly used for small consumer goods, pharmaceuticals, and medical devices. It consists of a rigid, clear plastic shell, often sealed to a backing made of paperboard or a layer of aluminum foil. This packaging method is designed to protect the product from physical damage, contamination, and tampering while also providing visibility of the product to consumers.
What is a Blister Pack?
Definition
A blister pack is a pre-formed, clear plastic packaging used to hold single or multiple items in a secure and often tamper-evident manner. The items are enclosed between a pre-formed plastic cavity (blister) and a backing material.
Key Components
- Blister: The clear plastic shell which is typically made from materials such as PVC (polyvinyl chloride), PET (polyethylene terephthalate), or PE (polyethylene).
- Backing: The material to which the plastic shell is attached, usually composed of paperboard, aluminum foil, or a combination of materials to enhance strength and protection.
Types of Blister Packs
Face Seal Blister
In this type, the blister is sealed directly to the surface of the backing card. It is one of the most common types due to its cost-effectiveness.
Full-Face Blister
Here, the plastic encases not only the product but also extends to the edges of the backing card. This provides additional strength and puncture resistance.
Clamshell Blister
A clamshell blister pack features two layers of plastic that enclose the product, hinged at one end. This form can be reclosed after initial opening and is used for products that may need to be reused.
Trapped Blister
The blister is trapped between two layers of backing material, providing enhanced security and a more appealing presentation.
Special Considerations
Environmental Impact
Blister packs are often criticized for their environmental impact, due to the plastic materials involved. Some modern blister packs, however, use recyclable plastics or bio-degradable materials as alternatives.
Tamper Evidence
Blister packs provide a high level of tamper evidence, which is crucial for products like pharmaceuticals, ensuring product integrity and consumer safety.
Historical Context
Blister packaging has been in use since the mid-20th century. Initially adopted by the pharmaceutical industry, it soon gained popularity across various sectors due to its strength, transparency, and tamper resistance.
Applicability and Use
Common applications of blister packs include:
- Pharmaceuticals: Pills and tablets often come in blister packs to ensure dose integrity.
- Consumer Goods: Small electronics, toys, and hardware are frequently packaged in blister packs.
- Medical Devices: Sterile instruments and devices utilize blister packs to maintain sterility and prevent contamination.
Comparisons
Blister Pack vs. Clamshell Packaging
While both use clear plastic, clamshells can be reclosed, whereas blister packs are generally sealed once. Clamshells are ideal for reusable items, while blister packs better serve single-use or tamper-sensitive products.
Related Terms
- Clamshell Packaging: A form of packaging that can be reclosed.
- Shrink Wrap: A plastic film tightened around the product after heat is applied.
- Thermoforming: The process of shaping plastic into blister packs through heat.
FAQs
Are blister packs recyclable?
Why do manufacturers use blister packs?
How do you open a blister pack?
References
- “Understanding Blister Packs in the Pharmaceutical Industry,” Journal of Packaging Technology, 2020.
- “Sustainable Packaging Solutions,” The Green Packaging Association, 2021.
Summary
Blister packs are a versatile and widely-used packaging solution that offers protection, visibility, and tamper evidence. Despite environmental concerns, innovations in recyclable and biodegradable materials are enhancing their sustainability. This packaging method remains a mainstay in industries ranging from pharmaceuticals to consumer electronics, demonstrating its utility and adaptability.
