Two-, three-layer sacks
The sacks can be made of two or three layers of paper and laminated with an additional (typically – one of the layers) to protect the product against moisture penetration from the outside and/or to achieve a higher strength packaging.
The material and bag size are selected depending on the product that is subject to packaging.
The upper paper layer may be white or brown. The inner layer is typically brown.
Formation of the bag occurs on an automated production line. The bottom of the sacks is always additionally glued for strength.