| 摘要 |
<p>A size press, which comprises three coating rolls (11, 12, 13). These rolls (11, 12, 13) form two press nips (N1, N2) as pairs with each other, the paper web (W) to be treated being passed through the said press nips. Both sides of the web (W) are treated in the said nips (N1, N2). Out of the said coating rolls, regarding the position of altitude, the uppermost roll (12) has been arranged as the centre roll of the size press, in connection with which centre roll the two coating nips (N1, N2) are formed so that the first coating nip (N1) is placed at a short angular distance (α1) underneath the horizontal plane (H-H) placed through the axis of the said centre roll (12). The second coating nip (N2) is formed by the third coating roll (13), which is placed substantially in the vertical plane (V-V) placed through the centre point of the centre roll (12) or at a small angle (α2) after the said plane. As preceding the first nip (N1), size-feed devices (24, 25) have been provided at the centre-roll (12) side of the run of the web (W), which size-feed devices (24, 25) feed a first size pool (L1) or layer into the substantially vertical pit between the centre roll (12) and the web (W). Preceding the second nip (N2), a second set of size-feed devices (26, 27) has been provided in the substantially horizontal pit formed by the centre roll (12) and by the third coating roll (13), the said second size-feed devices (26, 27) forming the second size pool (L2) or layer at the opposite side of the web (W), as compared with the said first size pool (L1) or layer. The said devices are jointly operative so that, while the sizing is performed, the web (W) is supported by a roll face.</p> |
