Different perforation techniques find their use in many different applications:
Printed PE in-mould labels are introduced into the production machine while the containers are being blown into their form. If the labels are perforated, air can escape through the pores. The result is higher cycle rates while maintaining process reliability.
Bulk Sack Filling
When powdered materials are packaged, the air must be able to escape quickly from the bag. The perforation serves this purpose. At the same time, the hole size must be exactly adapted to the contents. When bulk or powdered goods have to be filled in plastic or paper sacks perforation causes the displaced air to escape more quickly allowing for faster filling speeds.
Examples: cement, soil, milk powder, etc.
In construction and agriculture
Perforated films are proven and tested in the construction and agriculture industries, which are used, for example, to provide a moisture barrier while still allowing air circulation.
This application is used e.g. in the refurbishment of old buildings as a protective layer between thermal insulation and interior work.
Example: roof underlay foil
The perforation of a coffee or tea filter increases the fluid flow and controls it. The hole density and diameter control the brewing time. This is how different strengths of coffee and tea can be created.
Hygiene and medical products
Perforated material is of particular importance in the field of hygiene and medicine:
Plasters should ensure that no dirt or other substances come into contact with the wound. By perforation of the patches air penetrates to the wounded area, thereby the healing process proceeds faster. With plasters on a roll, a perforation also serves as an easy tear off.
A special type of perforation allows a so-called one way transmission of liquids. This means that liquids can be transported away from the place of their origin and collected in a storage container. However, this effect is only partially achievable with needles.
The perforation of non-woven materials for hygienic applications requires relatively large holes and high web speeds. A process specially developed by AFS can meet these requirements.
Fresh produce, such as bakery products, vegetables and flowers are often packaged using perforated plastic film. The perforations allows moisture from the product to escape from the packaging, which prevents the film from fogging, and extends the product’s freshness. Flowers and vegetables stay fresh, baked goods crispy.