Four-stacked net forming equipment and method for producing coating kraft liner board
A technology for coating kraft paperboard and forming equipment, applied in the field of papermaking, can solve the problems of poor product quality, low production efficiency, poor coating effect, etc., and achieve the effects of long contact time, simplified production steps, and good smoothness
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Embodiment 1
[0031] The bottom layer slurry, core layer slurry, liner layer slurry and surface layer slurry are prepared respectively. The bottom layer slurry is made of long fiber pulp after OCC waste paper pulping, and the core layer slurry is made of OCC waste paper. The short fiber pulp that is classified after pulping is used as raw material, the lining layer pulp uses waste newspaper as raw material, and the surface layer pulp adopts bleached wood pulp as raw material. The bottom layer pulp, core layer pulp, lining layer pulp and The surface layer slurry is compounded on a four-fold wire forming device at a content ratio of 25wt%, 35wt%, 20wt% and 20wt%, respectively, to obtain base paperboard.
[0032] The base paperboard is squeezed to remove moisture by a pressing device, and the pressing device includes two straight-through shoe presses, the pressing pressure of the first shoe is 800kN / m, and the pressing pressure of the second shoe is 900kN / m. The first shoe press upper roll and...
Embodiment 2
[0036]The bottom layer slurry, core layer slurry, liner layer slurry and surface layer slurry are prepared respectively. The bottom layer slurry is made of long fiber pulp after OCC waste paper pulping, and the core layer slurry is made of OCC waste paper. The short fiber pulp that is classified after pulping is used as raw material, the lining layer pulp is made of mixed office waste paper and waste book paper, and the surface layer pulp is made of bleached wood pulp and white paper strips. The liner slurry and the surface layer slurry are respectively 30wt%, 30wt%, 22wt% and 18wt%, respectively, and are compounded on a four-fold wire forming device to produce base paperboard.
[0037] The base paperboard is squeezed to remove moisture by a pressing device, which includes two straight-through shoe presses, the pressure of the first shoe is 900kN / m, the pressure of the second shoe is 1000kN / m, and the pressure of the two shoes is 1000kN / m. The first shoe press upper roll and t...
Embodiment 3
[0041] The bottom layer slurry, core layer slurry, liner layer slurry and surface layer slurry are prepared respectively. The bottom layer slurry is made of long fiber pulp after OCC waste paper pulping, and the core layer slurry is made of OCC waste paper. The short fiber pulp that is classified after pulping is used as raw material, the lining layer pulp is made of mixed office waste paper and waste book paper as raw material, and the surface layer pulp is bleached bleached pulp made of bleached wood pulp and mixed office waste paper and waste book paper. Ink slurry is used as a raw material, and the bottom layer slurry, core layer slurry, liner layer slurry and surface layer slurry are respectively placed on a four-fold wire forming device according to the content ratio of 40wt%, 30wt%, 15wt% and 15wt%. Composite copying to produce raw cardboard.
[0042] The base paperboard is squeezed to remove water through a pressing device, and the pressing device includes two straight...
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