In essence, folding and gluing operation is meant to control the gluing process, in fact the whole process including folding of flat materials followed by machine or manual gluing and as a result transformation of blanks into finished products. It is not only accuracy of folding to be checked but also thickness of adhesive layer, gaps between glued elements, mismatch of glued seams, presence of tears, dents, blurred images.
Flaps can be glued either on special equipment or manually. The latter provides lower quality of gluing. The gluing quality control is the key process during folding and gluing of various packaging products (cartons, envelopes, pocket folders, paper bags).