It is a type of high-strength paper produced by the sulphate process from long-fibre, softwood trees such as pine, fir and spruce.
If desired, Kraft papers can be produced completely white or by using white cellulose only on the upper surface, under the name White top.
They are two or three-layer liner papers produced by adding brown or white primary or secondary fibers to old recycled paper fibers.
The upper side of the paper is made from bleached non-recycled fiber. The underside, which is brown or gray, consists of 100% recycled fibres.
It is produced partly mechanically and partly chemically from hard trees such as maple, birch and eucalyptus, whose wood is short-fibered.
They are fluting papers produced entirely from recycled paper. Their weight can vary between 75-220 gr/m².