| 摘要 |
<p>Formaldehyde resin fibres, in particular urea formaldehyde resin fibres, are produced by introducing a liquid formaldehyde resin and a catalyst into a spinning cup in the presence of cold humid air which inhibits drying and reaction, centrifugally spinning fibres from the cup into the path of hot air currents, at between 50.degree.C and 100.degree.C, which dry the fibres without curing them, and curing and chemically stabilising the dry fibres by heating at above 100.degree.C until they are insoluble in cold water, The fibres are useful in paper-making,</p> |
