Solid content of paper web

The effect of pressing nip load on the solids content of the upper spray former is shown in the table and figure (slightly). When the load of the first press is increased from 0 or 35 kN/m to 105 kN/m, the solid content of the paper web made from the low-prepared ingredients is increased by more than 1%, which is made from the high-grade ingredients The solids content of the web is only increased by a very small percentage. Increasing the nip load of the 4th press from 9 or 53 kN/m to 175 kN/m, the solids content of the paper web made from the low-grade semi-slurry is increased by 1%, and the finished product is made of a high-grade finish. The solid content of the paper web increased by 2%.
The solids content of the web is a function of the total nip pulse for all presses. Black grid indicates Bel-Form paper; white grid indicates long web paper machine paper. Hardwood Kraft Pulp Freeness is 250ml CSF
After the paper sheet formed from seminal pulp to 250 ml CSF hardwood pulp was pressed, its solids content was a function of the total nip pulse for all presses. Increasing the load of the fourth press can improve the dewatering more than the load of the first press. It is likely that the fourth press rewetting the sheet when the nip load of the fourth press is lower than the nip load of the third press. These results show that the reduction of the final press load in order to increase the bulk of the paper will increase the burden of drying.
Seminal plasma has an important influence on dehydration. By increasing the degree of seminal plasma, the freeness of hardwood pulp was reduced from 350 to 250 ml of CSF, and the solid content in the pressed sheet could be reduced by about 2% under any squeezing conditions.
The degree of loose seminal grout of uncalendered and calendered paper had minimal effect on the bulk of uncalendered paper (Table 3). The difference in bulkiness in the ten sheets of paper with two refiners under the same conditions is negligible.
The distribution of fines and fillers (see the distribution of fines and fillers below) shows that seminal pulp only slightly changed the structure of the paper. However, sheets made from pulp with a low degree of fineness contain more filler, which can increase the density of the paper. Our test was conducted on a test paper machine at a speed similar to that of an industrial paper machine.
Under these conditions, paper with a high degree of fineness, after pressing, has higher moisture than paper with a low degree of fineness, and the large moisture content helps maintain the bulk of the paper. When the freeness is less than 350 mlCSF, the seminal plasma has little effect on the bulk, so reducing the seminal plasma does not significantly increase the bulk.
Table 3 (slightly)
Figure 3 (slightly) shows that the bulk of the uncalendered paper can be used as a function of the total nip pulse for all presses. This figure shows that the bulk is only moderately affected by the press nip load. For example, the diamond symbol represents the press condition where the fourth press load is increased from 53 to 175 kN/m (300 to 1000 lb/in).
This dramatic change in the final press nip load produces only a slight reduction in the bulk of the paper. Therefore, reducing the load on the final press nip is not an effective way to increase the bulk of the sheet.
Surprisingly, it is much more effective to reduce the load on the first press. The load of the first press was increased from 0 to 53 kN/m (0 to 400 lb/in), and at both finishes, the bulk was reduced by 0.1 m3/g, or 6%. Therefore, on a four-press paper machine, canceling the first nip can increase the bulk of the paper more than reducing the load of the last press.
The bulk of the uncalendered paper can be a function of the total nip pulse for all presses. Black Grid indicates Bel-Form, and White Grid indicates the Long Paper machine paper. Hardwood Kraft Pulp to (a) 250ml CSF and (b) 350ml CSF
The test data obtained when the total press pulse value is close to 22.5 kPa·s can better understand the influence of the press nip load on the bulk of the paper. Diamond logos indicate press loads of 53, 70, 88, and 53 kN/m, while square logos indicate press loads of 0, 70, 88, and 105 kN/m. The bulk of the samples represented by the squares was higher than the bulk of the samples represented by the rhombuses, although the highest nip load that these samples passed was greater (105:88 kN/m).
There are two explanations for this finding: either the double blanket first nip can reduce the bulk more than the single nip first nip, or the bulk when the same press pulse is distributed in more press nips Decline more.
In the figure, an attempt was made to find the relationship between the bulk of the uncalendered paper and the solids content of the press web. For paper made from pulp with a low degree of seminal pulp, the bulkiness of the paper after solids content is low after pressing, but paper made from ingredients with a high degree of refinement does not have this relationship. ......