lu-Alu and Alu-Blister are two kinds of packaging method for food, medicine and nutrition industry especially for hard tablets and capsules. Then what is the difference between these two ways and how to choose the proper ways of packing for your own products, you may want to dig inside.
Material Structure Alu-Alu is a final pack with both aluminum on top and bottom. The top layer is Blister aluminum foil (also called lidding foil) while the bottom layer is cold form aluminum foil( also called alu alu bottom foil). Alu-Blister is made of Blister aluminum foil on the top and PVC film (or PVDC coated PVC film) on the bottom.
Appreance Alu-Alu is of both side of metallic luster while Alu-Blister is with one side made of plastic so it can be more colorful or see through.
Blister Machine application Alu-Alu packing machine and Alu-Blister packing machine have different blistering structures. Alu-Alu is cold formed under the usage of the mold to directly stamp the aluminum foil into the required blister shape at room temperature. While PVC is plasticized at high temperature so that the shape required within Alu-Blister machine.
Protection Effects Alu-Alu pack has better barrier effect than Alu-Blister (usually we indicate (ALU-PVC) against water, oxygen and sunlight. In order to make up for the effects, pharmaceutical companies may choose PVDc film instead of pure PVC rigid film to achieve lower transmittance of those factors mentioned ahead.
Cost and Value Alu-Blister pack has cheaper cost than Alu-Alu pack. For normal medicines or food, Alu-Blister pack will be enough for protection. For those who are easy to absorb moisture and oxidize, Alu-Alu pack will be on top list.