| 摘要 |
<p>Production of papermaking pulp from recycled paper containing contaminants (CT's) involves (i) stirring the paper in presence of water to give a mixture of fibers and CT's in suspension, (ii) coarsely screening to remove coarse CT's, (iii) finely screening to remove fine CT's, (iv) washing the coarse and fine CT's to separate recoverable fibrous material from other non-recoverable CT's and (v) preferably recycling the washing water recovered in step (iv). An independent claim is included for a plant for carrying out the process, including (a) at least one helical pulper (2) provided with a screening sieve (2b) and (b) an additional screening device (9) of the discharge bulb type, provided in the interior with a sieve (9a) having small holes.</p> |
