CN-118147943-B - Paper machine

Abstract

The invention provides a paper machine for manufacturing a tissue paper web, which is characterized by comprising a forming part, a pressing part and a drying part, wherein the pressing part comprises a pressing assembly, the pressing assembly comprises a main pressing roller, a first pressing roller and a second pressing roller, the forming part comprises a forming fabric belt, the transferring fabric belt comprises a transferring base surface and a plurality of concave units arranged on the transferring base surface in an array mode, each concave unit comprises four strip-shaped concave parts, the spacing distances of the adjacent concave parts are equal, the directions of the adjacent concave parts are vertical, and each concave part has a depth of 0.08-0.4 mm.

Inventors

• ZHANG LIGUO
• QI JIANQING
• CHEN YANG

Assignees

• 泰盛(宿州)生活用品有限公司

Dates

Publication Date

20260505

Application Date

20240412

Claims (9)

1. 1. A papermaking machine for making a tissue web, comprising: A forming section for forming a wet paper web; The press part comprises a press assembly, wherein the press assembly comprises a main press roll, a first press roll and a second press roll, the first press roll is matched with the main press roll to form a first press area, the second press roll is matched with the main press roll to form a second press area, and the wet paper web passes through the first press area and the second press area to form a press paper web; A dryer section including a dryer cylinder for drying the press web to form a dried web and a doctor blade for creping the dried web to form a tissue web; The forming section further comprises a forming fabric belt arranged on the first press roll and the second press roll and supporting the wet paper web to pass through the first press area and the second press area, and the press section further comprises a transfer fabric belt wound on the main press roll and transferring the pressed paper web formed after passing through the first press area and the second press area to a drying cylinder; the transfer fabric belt comprises a transfer base surface and a plurality of concave units arranged on the transfer base surface in an array mode, each concave unit comprises four strip-shaped concave parts, the spacing distances of the adjacent concave parts are equal, the directions of the adjacent concave parts are vertical, each concave part has a depth of 0.08-0.4 mm, the forming fabric belt comprises a forming base surface and a plurality of convex units arranged on the forming base surface in an array mode, the convex units are arranged corresponding to the concave units, each convex unit comprises four strip-shaped convex parts, and the directions of the corresponding convex units and the convex parts on the concave units are vertical.
2. 2. The paper machine of claim 1, wherein the height of the protrusions is less than the depth of the depressions and the protrusions have a height of 0.05 to 0.35 mm.
3. 3. The paper machine according to claim 1, wherein the first press roll applies a first pressure to the main press roll in the first press zone and the second press roll applies a second pressure to the main press roll in the second press zone, the first pressure being 200 to 400kn/m and the second pressure being 300 to 450kn/m.
4. 4. A paper machine as claimed in claim 3, characterized in that the press assembly comprises an intermediate press section between the first press section and the second press section, which is sandwiched by the forming fabric belt and the transfer fabric belt, the press assembly comprising an intermediate press device arranged in correspondence of the intermediate press section, the intermediate press device comprising a plurality of third press rolls and a press belt wound around the plurality of third press rolls, the press belt comprising an intermediate zone abutting the intermediate press section, the third press rolls being arranged to apply a third pressure to the forming fabric belt in the intermediate zone.
5. 5. The paper machine of claim 4, wherein the main press roll includes a rigid sidewall and a receiving space surrounded by the rigid sidewall, the rigid sidewall includes a plurality of through holes penetrating through a thickness direction of the rigid sidewall, and an adsorption tank is disposed in the receiving space, the adsorption tank includes an adsorption cavity, the adsorption cavity includes an adsorption port, and the adsorption port is disposed corresponding to the first press zone, the middle press zone, and the second press zone.
6. 6. The paper machine of claim 4, wherein the recess has an aspect ratio of 2.5 to 4, a length of 0.6 to 0.9mm, and a width of 0.2 to 0.4mm, and an area of 0.1 to 0.4mm 2.
7. 7. The paper machine as claimed in claim 6, characterized in that the spacing between adjacent recesses is equal to the spacing between adjacent recess units.
8. 8. The paper machine as claimed in claim 6, wherein the plurality of recess units are arranged in rows in the X-axis direction in sequence, and the plurality of rows of recess units are arranged in columns on one side in the Y-axis direction, the X-axis direction having an angle of 5 ° to 15 ° with respect to the CD direction, which is the direction of the sheet perpendicular to the machine direction.
9. 9. The papermaking machine of claim 8, wherein a spacing between adjacent depressions is less than a width of the depressions.

Description

Paper machine Technical Field The invention relates to a paper machine, in particular to a paper machine for manufacturing low-basis-weight household paper. Background The daily paper is widely applied to daily life of people, and with the improvement of living standard, people have higher and higher requirements on softness, thickness, strength, touch/hand feeling and the like of the daily paper, and in order to meet the requirements on softness, touch/hand feeling, strength, thickness and the like, three-layer and four-layer tissue papers are increasingly adopted to form a multi-layer daily paper form. Meanwhile, in order to make the household paper have a thicker, tough and comfortable touch feeling, a TAD (through air drying) technology has been developed, and through years of development, the technical defects of high energy consumption and the like of the technology are more and more emphasized in the industry, and in order to further improve the performance of the household paper obtained by the traditional DCT technology, people combine the TAD technology or improve the traditional DCT technology to develop the technology such as NTT and ATMOS technology so as to realize lower energy consumption and obtain higher bulk of the paper. These devices such as those shown in CN103890264A, US6743339B1 for making paper, however, with the improvement of living standard, there is an increasing demand for softness, thickness, strength, touch/feel, etc. of paper, and in order to meet the demands for softness, touch/feel, strength, thickness, etc., three-ply and four-ply tissue papers are increasingly used to form multi-ply paper, so that a single ply paper having an extremely low basis weight, such as 12g/m2 or less, or 11g/m2 or less, or even 10g/m2 or less, is increasingly strongly demanded, and by laminating these single plies paper having an extremely low basis weight, paper having an extremely good touch/touch, strength, softness is formed, but TAD or improved NTT and ATMOS are generally suitable for making paper having an extremely low basis weight, especially paper having an extremely low basis weight of 10g/m2 or less, regardless of conventional DCT. In addition, when the conventional NTT technology is adopted, a felt as shown in CN101952506a is generally adopted, when paper sheets with extremely low basis weight are manufactured, for example, below 9g/m2, because the paper sheets are extremely thin, the felt has certain elasticity, so that higher pressure is required to be adopted in the pressing process to achieve better dehydration, and when higher pressure is adopted, problems such as crumpling or dead lines are more likely to occur on the extremely thin paper sheets. For this reason, an improved solution is needed to solve the above-mentioned technical problems. Disclosure of Invention To this end, the present invention provides a paper machine to solve the above technical problems. A papermaking machine for making a tissue web, comprising: A forming section for forming a wet paper web; The press part comprises a press assembly, wherein the press assembly comprises a main press roll, a first press roll and a second press roll, the first press roll is matched with the main press roll to form a first press area, the second press roll is matched with the main press roll to form a second press area, and the wet paper web passes through the first press area and the second press area to form a press paper web; A dryer section including a dryer cylinder for drying the press web to form a dried web and a doctor blade for creping the dried web to form a tissue web; The forming section further comprises a forming fabric belt arranged on the first press roll and the second press roll and supporting the wet paper web to pass through the first press area and the second press area, and the press section further comprises a transfer fabric belt wound on the main press roll and transferring the pressed paper web formed after passing through the first press area and the second press area to a drying cylinder; The transfer fabric belt comprises a transfer base surface and a plurality of concave units arranged on the transfer base surface in an array mode, each concave unit comprises four strip-shaped concave parts, the interval distances of the adjacent concave parts are equal, the directions of the adjacent concave parts are vertical, and each concave part has a depth of 0.08-0.4 mm. The forming fabric belt comprises a forming base surface and a plurality of protruding units arranged on the forming base surface in an array mode, wherein the protruding units are arranged corresponding to the concave units, each protruding unit comprises four strip-shaped protruding parts, and the directions of the protruding parts and the concave parts on the corresponding protruding units and the concave units are vertical. The height of the protruding portion is smaller than the depth of the concave portion, and the protruding port