The windows in the boxes or packs are used mainly in cosmetic products, baby clothes, toys, pastry etc … As a general rule, the materials used to make these windows are usually pet and pvc. Windows can be split or without split (corner) and are classified according to their stiffness, which is given by the microns they have. The greater the number of microns, the stiffer the window will be, giving rise to what is also known as a window gauge.
The gluing of windows is carried out with a window gluing machine after the boxes have been punched out, leaving the area where the window will go ejected, and before gluing.
Die cut boxes are placed print side down in the introducer. The adhesive pattern is glued on the sheet or cardboard sheet. The film reel is unwound and cut to the desired length The resulting window piece is transported to the absorption roller. At just the right moment, the roller compresses the window on the cardboard as it passes under the cylinder.