| 摘要 |
<p num="1"><br/><br/><br/>The invention concerns a method for making a sheet of paper and/or cardboard <br/>and the like, which consists, prior to forming said sheet, in adding to the <br/>fibrous suspension, separately or mixed, in any sequence of introduction, into <br/>one or more injection points, at least three dry strength agents respectively: <br/>a first agent corresponding to a (co)polymer having a cationic filler density <br/>higher than 1 meq/g and exhibiting primary amine functions; a second agent <br/>corresponding to a synthetic organic (co)polymer having a cationic filler <br/>density higher than 0.1 meq/g; and a third agent corresponding to a <br/>(co)polymer having an anionic filler density higher than 0.1 meq/g.<br/>
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