There are regulations on how moisture-, oxygen- and light-resistant
blister packaging must be, but some products may require extra
resistance. While many different materials can be used to make blister
packs, they can be separated into two categories: cold-formable and
Cold-formable material is commonly pressed aluminum that is laminated with plastic. The aluminum is resistant to many outside forces and has high mechanical resistance; aluminum has a tendency to leech into other materials and to crack, but the plastic inclusion corrects these issues. Thermoformable materials are plastics that can be easily molded into any shape, but they are not as resistant to outside forces — especially light — because the plastic is transparent. If the product is a simple shape that needs high resistance, then cold-formable materials are likely best;
Cold Forming Blister Foil(Alu-Alu) is one kind of blister primary packaging material for solid pharmaceuticals, like tablet & capsule.
The foil produced in Dirante factory is three layers laminated: oPA / Alu / PVC, under using dry bond lamination technology.
The PVC film in alu -alu laminate is commonly used as the contact layer and seal to the lidding foil on pharmaceutical blisterpack (as neutral layer for the goods to be filled).
PVC is very stiff and does not tend to shrink or spring during cold forming. Once the cold forming process is complete, the PVC helps the cavity hold its shape. In short, it ensures the geometric stability after cold forming.
The nylon (oPA) film is mostly responsible for the multi - axial forming. Laminating the aluminum with the oPA film doubles the formability of the blister.
Cold Forming Blister Foil Specification
|Name||Cold-Form Aluminum Foils|
|Structure||oPA 25-30 mic/ Alu 45-75 mic/ PVC 60 mic|
|Specification||Width: 60 - 660 mm; |
Thickness: 130 - 200 mic;
Core ID: 76 mm, paper reel;
Roll OD: 260-300mm, also can be as your request
Blister packs are commonly used as unit-dose packaging for pharmaceutical tablets, capsules etc. The primary component of blister pack is a cavity or pocket made from a formable film, usually a thermoformed plastic or cold formed aluminum film. This usually has a lidding seal of aluminum foil.
Using different packaging materials and principles of forming, Blister Packs may be divided into two types: aluminum/plastic (thermoforming) blister pack, aluminum/aluminum (cold forming) blister pack.