| 摘要 |
A papermaking assembly feeds a fibrous suspension to a horizontal moving sieve forming part of a dewatering station which esp. terminates in a full-width suction element (13) located immediately after a sieve drive drum (7). Between the suction element (13) and drive drum (7) the flat sieve (4) subtends an angle alpha with respect to the preceding length of sieve. In a carton or papermaking assembly (1) a fiber suspension (3) is surrendered from a headbox (5) to an elongated horizontal moving sieve (4) forming a pre-dewatering section (V). The sieve advances (S) towards a dewatering station (E) which is essentially formed by a flat horizontal section of sieve. The angle subtended by the sieve between the suction element and drive drum is 1-10 pref. 2-4. The suction unit is a full-width unit flat hood or a high vacuum suction unit pref. sub-divided into a number of zones by strips at intervals of pref. 10-25 mm. The vacuum applied is pref. 0.4 - 0,55 bar and is coupled to a measurement and control device. That part of the suction hood in contact with the sieve has an interface fabricated fine-grained stabilized aluminum oxide (Al2O3) or silicon carbide (SiC). The sieve drive drum diameter is pref. 350-850 mm.
|
