Usually, when we customize paper bags for chemical packaging, it is white card or coated paper, which will increase brightness and load-bearing by laminating, but kraft paper bags are not suitable for laminating because their surface is not as smooth as the first two kinds of paper. Generally at most, the film on the inner side also plays a waterproof role. Kraft paper will increase the brightness by oiling.

Over-oiling and laminating are divided into varnish and dumb oil. The chemical packaging paper bag is to apply a layer of oil on the surface of the printed matter. Varnish can mainly improve the brightness of printed matter, and can be used for gift paper bags or clothing paper bags for toys and children's clothing; dumb oil can make paper bags appear more stable and high-end, such as some high-end clothing paper bags or business celebration paper bags can be considered.