Aluminum foil flexible packaging is mainly used for the packaging of various foods such as food bags, beverages, candies, chocolates, and cooked foods. Aluminum foil provides a complete barrier to light, oxygen, moisture and bacteria. Therefore it is widely used in food and pharmaceutical packaging. Aluminum foil is also used for aseptic packaging, which allows perishable goods to be stored without refrigeration.
Common requirements for flexible packaging aluminum foil
The common requirement for flexible packaging aluminum foil is that it has a flat shape (less than 20Ⅰ);
uniform surface;
Consistent thickness (3% tolerance);
Good expandability (less than three meters);
clean surface;
fewer pinholes;
Few and strong joints (less than 20%);
Suitable mechanical properties.
Several problems with flexible packaging aluminum foil
Flexible packaging aluminum foil currently has several problems that need to be solved.
The uniformity of the surface condition of flexible packaging aluminum foil is too expensive. If a good surface is required, the production cost will increase significantly. So far, there is no good solution.
As a product with extreme thickness, aluminum foil has almost exhausted all its plasticity. Flexible packaging aluminum foil is not very reprocessable, despite the use of new alloys and processes (for example: 8011, 8079). There is still no good way to significantly improve plasticity. The processing method of flexible packaging composite bags takes less into account in this aspect, so that bursting often occurs.
The indicators for measuring the plasticity of aluminum foil are unscientific and cannot truly express the plasticity of aluminum foil. The performance of flexible packaging aluminum foil is still in the trial stage. Without scientific indicator measurement, production inspection cannot be carried out.
Scientific selection of thickness, reasonable composite technology, and supporting materials are as important as the performance of the aluminum foil itself. Reasonable matching can not only stabilize product quality but also reduce costs.
