Abstract
In this study, we improved the dispersibility of the stocks in the headbox of an inclined wire machine to produce a distinct paper, and analyzed some factors affecting paper formation in the production of multi-ply paper. We used FLUENT6.3 to analyze the flow of the stocks in the headbox and select the structure of the diffusion part required for improving the dispersibility of fibers. Moreover, based on a simulation experiment, the optimal rational angle of the diffusion part (γ) was found to be approximately 8°~10°, and it improved the paper formation in the case of usage of two plates. Using the equation for the formation of paper layers in the headbox of an inclined wire machine, we obtained a paper with the given basic weight by controlling the inclined angle of the wire (α), initial height of water (H), and concentration of the stocks. We considered the effect of α and H of the stocks in the headbox on the fiber distribution, and according to the results, α should be set as approximately 20°~30°and H should be maximally high. When producing multi-ply paper by a wire, the line pressure of the couch roll should be maintained at 1.8~2.0 kN/m to avoid the damage to the paper sheets. In addition, we found the optimal structure parameter of the dehydrated roll was as follows: hole ratio of approximately 30% of the dehydrated roll surface area, width of 1.5~2.0 mm, slot pitch of 5~6 mm, slot depth of 2~3 mm, and inclined angle of diffusion part (β) of 5°.
