| 摘要 |
<p>Methods and systems for making a fibreboard product having a desired final thickness dimension by subjecting a fibrous board preform (BP) to a successive series of compressive pressures. Preferably, an upstream one of the compressive pressures causes the board preform to exhibit a compresses thickness dimension (Ti) which is less than the final thickness dimension (TF) of the fibreboar product, while a downstream one of the compressive pressures (Cl, C2) causes the board preform to exhibit a thickness dimension which is substantially the same as the final thickness dimension of the fibreboard product. Between subjecting the board preform of these upstream and down stream compressive pressures, the upstream one of the compressive pressures may be removed sufficiently to cause the compressed thickness dimension to increase to an intermediate thickness dimension (T2) which is less than the initial thickness dimension (To) of the board preform, but greater than the final thickness dimension of the fibreboard product. Most preferably, the upstream compressive pressure is accomplished by passing the board preform between and through a nip space defined between an opposed pair of rolls (10-1, 12-1).</p> |
