In certain types of packaging, paper must resist grease and oil penetration.
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Paper that has not been specifically treated to produce wet strength possesses from about 4 to about 8 percent of its dry strength when completely wetted.
By treating paper as described above, wet strength can be raised to about 40 percent of the dry strength.bursting test, or Mullen test.
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Most common papers are in the range of 0.5 to 0.7 gram per cubic centimetre.determined by the following factors in combination: (1) the strength of the individual fibres of the stock, (2) the average length of the fibre, (3) the interfibre bonding ability of the fibre, which is enhanced by the beating and refining action, and (4) the structure and formation of the sheet.
Resistance to rupture when subjected to various stresses is an important property in practically all grades of paper.
Most papers require a certain minimum strength to withstand the treatment received by the product in use; but even where use requirements are not severe, the paper must be strong enough to permit efficient handling in manufacture.
breaking length—that is, the length of a paper strip in metres that would be just self-supporting.