Cold Forming Blister Foil

Cold Formed OPA/Al/PVC Sandwiched Foil For Blister Packs

About Cold Formed Alu Alu Foil ：

Cold formed aluminum foil is at the heart of alu alu OPA/Al/PVC sandwich foils used for pharmaceutical blister pack applications because of their inherently superior advantages. Aluminum, even in micron thickness, is the best vapor and light barrier besides providing aesthetic shine for pharmaceutical blister packs.

What is pharmaceutical Cold forming foil？

Pharmaceutical Cold forming foil  is made of aluminum foil, nylon (oPA) and PVC films, by using dry bond lamination technology. As blisters are formed at room temperature, without heating, so it is called as cold forming blister laminated foil.

Cold forming foil is one type of triplex packaging material, between each two layers, there is adhesive for lamination. The adhesive we are using is imported from USA, to ensure good performance during cold forming process, such as no delamination and cracking.

Warm advice ：

generally speaking: the light foil  25/50/60 & 25/45/60 is good enough for small blisters or doses, small round tablets or pills, etc. But the blister profile and distance between each one will affect the performance of cold forming.

Meanwhile the operating speed, mold condition would take into account.  Do not worry, we Dirante will offer free sample to you for machine trial. It only takes 5-7days to prepare plain sample.

So it is best that you could share us the forming drawings, or send blister packs to us; if not available, the clear images of blister pack will be helpful to check and recommend the good foil to you.

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  thermoformable;

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.

Cold Forming Blister Foil Structure:

Cold Forming Blister Foil Features

• 100 % barrier against water vapor, gases, light etc.
• Excellent formability
• High degree of thermal stability
• High malleability for deep drawing blister cavities
• High aesthetic appeal
• Sealable with aluminum lidding foil
• Colorful surface as RAL color-list

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：

Technical data of ALU ALU are offered as follows：

The Differences Between Thermoforming and Cold Forming Blister Pack

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.

The advantages of Cold Forming Blister Foil:

• The most basic material for the forming web is PVC or Polyvinyl Chloride, for ease of thermoforming and low cost.
• The product can be visually examined through the transparent plastic. The fault blister card can be rejected vie the inspecting camera or naked eyes.
• Because the cavity or pocket contain the item snugly, it can adopt the universal feeder which consists of circular brushes and planetary agitators that sweep the products into blister pockets. Parts are not required for different formats. This feeder is noted for its low cost and ease of operation.
• The use of aluminum offers a nearly complete barrier for moisture，light and oxygen, allowing an extended product expiration date.

The disadvantages of Thermoforming Blister Foil:

• The protective properties are not strong because of the PVC’s poor barrier against moisture and oxygen ingress.
• The slower speed of production compared to thermoforming;
• The package is opaque, making the inspecting system, which rejects the faulty blister card, complicated and costly.
• The cost of cold forming aluminum film is higher than PVC.
• The larger size of the blister card (aluminum cannot be formed with near 90 degree angles) increases the material cost.
• Because the cavity or pocket is larger than the drug, the feeder should be dedicated. this increases the cost and difficulty of operation.

• Not suitable for light-sensitive drugs because of the transparency of PVC.

Processing of Alu-Alu Bottom Foil: