Sack kraft
Extensible sack kraft paper
The highest stretch and TEA in sack kraft. For high-speed valve-sack lines and heavy fills such as cement.
At the mill
TEA is the energy a sheet absorbs before it breaks. It grows with tensile and stretch together, and on sack grades stretch moves it more. High-consistency refining curls the fibers and puts small compressions into their walls, and a compacting unit shortens the damp web lengthwise. More stretch gives a less stiff sheet in tension.