| 摘要 |
<p>1388754 Pulp S G CUCURULL and R R GONZALEZ 30 March 1972 [7 April 1971] 15008/72 Heading D2W Pulp is made from vegetable material by chemical treatment with a deliquifying reagent followed by one or more steps of a mechanical treatment to effect defiberisation of the product resulting from chemical treatment, the resulting pulp having a freeness of 6-30‹SR when tested in accordance with NF-50-003 and a drainage time of 10-120 sees. when 50g. of dry pulp is dispersed in 7 litres H 2 O and drained on a sheet former to form a sheet. Sheet formed from the pulp according to a specified method and having a basis weight of 1500 g/m<SP>2</SP> has the following properties Thickness, mm. 1.5-3.5 Specific Gravity, g/cc. 0.4-1.0 Tensile Strength, Kgf/cm<SP>2</SP> 150-600 Dihedron Penetration, Kgf. cm. 40-100 when measured according to standard specified test methods. The deliguifying reagent may be an alkali or alkaline earth metal hydroxide, ammonium hydroxide, a sulphur compound and/or a hydrotropic salt. Mechanical treatment may be effected in conventional pulpers, stone or disc mills.</p> |
