This value varies from about 500 metres for extremely soft, weak tissue to about 8,000 metres for strong kraft bag paper, and to about 14,000 metres for sheets of paper made under ideal laboratory tensile testing has become important.This test is essentially the same as that for dry tensile strength, except that the specimen is wetted.The identification and expression of these differences depend upon the application of standard test methods, generally specified by industry and engineering associations in the papermaking countries of the world.basis weight, is a fundamental property of paper and paperboard products.
Used in a wide variety of forms, paper and paperboard are characterized by a wide range of properties.
In the thousands of paper varieties available, some properties differ only slightly and others grossly.
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.
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Content Header .feed_item_answer_user.js-wf-loaded . Oil and grease resistance is attained, in fact, by reduction in porosity.So-called greaseproof paper is made by beating an easily hydrated pulp to extremely low freeness, which results in a dense sheet with very little void space.Sizing paper with vegetable materials and rosinlike substances has already been described.When paper began to be used for wrapping, consumers demanded sizing treatments that could protect the contents of the package from the effects of fluid transfer through the paper wrapping.Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!The range in this property extends from very soft, flexible tissues to rigid boards.Thicker and heavier sheets tend to be stiff, whereas soft, flexible sheets are light and thin.has a strong affinity for water), absorbent papers have a minimum of foreign materials associated with the fibre.Of particular importance are the wood rosins that may be present in pulp and produce a self-sizing effect, especially upon aging. This reflectance is measured by an instrument that illuminates paper at an average angle of incidence of 45° and a wavelength of 457μ (microns).