Compact shoe pressing device of toilet paper machine and working method of compact shoe pressing device

Abstract

The invention belongs to the technical field of papermaking equipment, and relates to a compact shoe pressing device of a toilet paper machine, which comprises a shoe pressing roller, a vacuum roller and a Yankee drying cylinder, the vacuum roller is arranged in the middle and forms two pressing areas with the shoe pressing roller and the Yankee drying cylinder respectively; one blanket pressing area is located in a vacuum roller and Yankee drying cylinder pressing area; and the other blanket pressing area is positioned in a vacuum roller and shoe pressing roller pressing area. Meanwhile, the invention further provides a working method of the compact shoe pressing device of the toilet paper machine. According to the compact shoe pressing device of the toilet paper machine, pressure adjustment is extremely flexible, the product quality can be improved, energy consumption can be reduced, and the efficiency of the toilet paper machine is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking equipment and relates to a compact shoe press device of a toilet paper machine and a working method thereof. Background Art

[0002] In the process of toilet paper production, the dehydration efficiency of pressing is directly related to the drying efficiency of paper sheets. At present, the main forms of pressing dehydration in China are vacuum roller pressing dehydration and shoe roller pressing dehydration. The above two dehydration forms also have the following defects:

[0003] 1. Vacuum roller pressing dehydration: As the speed increases, the diameter of the vacuum roller should also increase; when the diameter is too large, it is inconvenient to change the net and hoist, so the dehydration effect is limited;

[0004] Second, the shoe roller dehydration form. In this form, the cross-section quantity is difficult to control, especially at the two edges, where the cross-section quantity is even more uncontrollable. In addition, a coating is provided on the surface of the Yankee dryer, and the coating is very thin, so there is an uneven coating. The uneven coating does not provide sufficient protection for the surface of the Yankee dryer. If the surface of the Yankee dryer is to be protected, the wall thickness of the Yankee dryer is made slightly thicker in the prior art. The thermal conductivity of the Yankee dryer with a slightly thicker wall is affected, so the dehydration efficiency is also reduced.

[0005] In summary, further research and development is needed to improve dehydration efficiency. Summary of the invention

[0006] The invention provides a compact shoe press device for a toilet paper machine, so as to achieve the purpose of compact equipment and improved dehydration efficiency.

[0007] At the same time, the present invention also provides a working method of the compact shoe press device of the toilet paper machine.

[0008] A compact shoe press device for a toilet paper machine comprises a shoe press roller, a vacuum roller and a Yankee dryer;

[0009] The vacuum roller is installed in the middle, forming two nip zones with the shoe pressure roller and Yankee dryer respectively;

[0010] One of the felt pressing areas is located in the pressure zone between the vacuum roll and the Yankee dryer; the other felt pressing area is located in the pressure zone between the vacuum roll and the shoe press roll.

[0011] Preferably, after the vacuum roller is installed, the connecting line between the installation axis of the shoe pressure roller and the installation axis of the vacuum roller is at an angle of 8°-12° to the vertical.

[0012] Preferably, after the vacuum roller is installed, the connecting line between the installation axis of the shoe pressure roller and the installation axis of the vacuum roller is at an angle of 10° to the vertical.

[0013] Preferably, after the vacuum roller is installed, the installation axis of the Yankee dryer and the installation axis of the vacuum roller are at an angle of 48°-53° to the horizontal.

[0014] Preferably, after the vacuum roller is installed, the installation axis of the Yankee dryer and the installation axis of the vacuum roller are at an angle of 51° to the horizontal.

[0015] Preferably, felt 1 and felt 2 have an overlapping section in pressing zone 2.

[0016] The working method of the compact shoe press device of the above toilet paper machine includes the following:

[0017] The working method of the compact shoe press device of the toilet paper machine is double-blanket pressing, in which one blanket operates in the pressure zone between the vacuum roller and the Yankee dryer; the other blanket operates in the pressure zone between the vacuum roller and the shoe press roller; the vacuum roller is belt-driven and rotates during operation; the shoe press roller is fixedly installed, and the shoe sleeve is set on the surface of the shoe press roller, and the shoe sleeve rotates with the vacuum roller.

[0018] Beneficial effects of the present invention:

[0019] 1. Compared with the double-blanket press in the prior art, the present invention uses three press rolls to form two press zones, while the four press rolls in the double-blanket press in the prior art form two press zones;

[0020] 2. In the present invention, the area between the vacuum roller and the shoe roller is a high-line pressure zone; the area between the vacuum roller and the Yankee dryer is a low-line pressure zone, which is no longer a high-line pressure zone. The Yankee dryer has a thin wall thickness and can meet production requirements; the thinner the Yankee dryer shell, the higher the heat exchange efficiency.

[0021] 3. New mechanical structure innovation can save fiber and long fiber usage, reduce steam consumption and improve product quality:

[0022] 1) Save fiber usage.

[0023] The shoe press roller pressure can be adjusted between 80-170KN / M. When the line pressure is low, the wrinkling process can be better optimized, and the more uniform banner spraying conditions can be improved, which can increase the bulk and bring potential fiber savings. When consumers use toilet paper, they are concerned about the thickness of the toilet paper, not the weight; the compact shoe press can use less fiber to produce products with the same thickness as traditional toilet paper machines.

[0024] 2) Save the amount of long fibers.

[0025] The pressure of the shoe press roller can be adjusted between 80-170KN / M. When using high line pressure, more short fibers can also meet the tensile strength requirements. The raw materials for toilet paper production are divided into long fibers and short fibers. Long fibers are made of coniferous wood, which has a long growth cycle and high price. The compact shoe press toilet paper machine can use less long fibers and more short fibers to produce products with the same tensile strength as traditional toilet paper machines.

[0026] 3) Reduce steam consumption.

[0027] After comparing the experimental data, the prior art only uses vacuum rollers, and the dryness of the paper entering the Yankee dryer is about 40%; after using the compact shoe press device of the present invention, the dryness of the paper entering the Yankee dryer is about 46%, an increase of 6 percentage points. For every 1% increase in the dryness of the paper in the exit nip zone of the toilet paper machine, the subsequent steam consumption can be reduced by about 5%; therefore, by using a compact shoe press, the subsequent steam consumption can be reduced by about 30%. Based on the steam consumption of 2.2 tons per ton of toilet paper, the compact shoe press can save about 0.66 tons of steam per ton of toilet paper.

[0028] The compact shoe press device of the toilet paper machine corresponds to the pressing form, which gives toilet paper manufacturers a new production process. The pressure roller will deform due to pressure, so when there is no pressure, the pressure roller is convex with a middle height; the soft shoe press is used as a pressure roller. When the other pressure roller is deformed, the soft shoe press will deform with it. There is no need to consider the middle height of the pressing roller, and there is no need to increase the wall thickness of the Yankee dryer. The pressure of the pressure zone can be changed in a wider range. The pressure adjustment is very flexible, which can not only improve product quality but also save energy consumption, greatly improving the efficiency of the toilet paper machine! BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the installation structure of the shoe press roller, vacuum roller and Yankee dryer in the frame;

[0031] In the figure: 1. Shoe press roller; 2. Vacuum roller; 3. Yankee dryer; 4. Blanket 1; 5. Blanket 2. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further explained below through specific implementation methods.

[0033] Example 1

[0034] Referring to the accompanying drawings, the present invention provides a compact shoe press device for a toilet paper machine, comprising a shoe press roller 1, a vacuum roller 2 and a Yankee dryer 3;

[0035] The vacuum roller 2 is installed in the middle, forming two pressure zones with the shoe pressure roller 1 and the Yankee dryer respectively; after the vacuum roller 2 is installed, the connection line between the installation axis of the shoe pressure roller 1 and the installation axis of the vacuum roller 2 is at an angle of 8°-12° to the vertical. During specific installation and use, after the vacuum roller 2 described in this embodiment is installed, the connection line between the installation axis of the shoe pressure roller 1 and the installation axis of the vacuum roller 2 is at an angle of 10° to the vertical; after the vacuum roller 2 is installed, the installation axis of the Yankee dryer 3 and the installation axis of the vacuum roller 2 are at an angle of 48°-53° to the horizontal. During specific installation, after the vacuum roller 2 described in this embodiment is installed, the installation axis of the Yankee dryer 3 and the installation axis of the vacuum roller 2 are at an angle of 51° to the horizontal.

[0036] One of the felt pressing areas is in the pressure zone between the vacuum roll 2 and the Yankee dryer; the other felt pressing area is in the pressure zone between the vacuum roll 2 and the shoe press roll 1. Felt 1 4 and felt 2 5 have an overlapping section in pressure zone 2.

[0037] Example 2

[0038] The working method of the compact shoe press device of the above toilet paper machine includes the following:

[0039] The working method of the compact shoe press device of the toilet paper machine is double-blanket pressing, in which one blanket operates in the pressure zone between the vacuum roller 2 and the Yankee dryer; the other blanket operates in the pressure zone between the vacuum roller 2 and the shoe press roller 1; the vacuum roller 2 is belt-driven and rotates during operation; the shoe press roller 1 is fixedly installed, and the shoe sleeve is arranged on the surface of the shoe press roller 1, and the shoe sleeve rotates with the vacuum roller 2.

Claims

1. A compact shoe press device for a toilet paper machine, characterized in that: Includes shoe press roll, vacuum roll and Yankee dryer; The vacuum roller is installed in the middle, forming two nip zones with the shoe pressure roller and Yankee dryer respectively; One of the felt pressing areas is located in the pressure zone between the vacuum roll and the Yankee dryer; the other felt pressing area is located in the pressure zone between the vacuum roll and the shoe press roll.

2. The compact shoe press device for a toilet paper machine according to claim 1, characterized in that: After the vacuum roller is installed, the connection line between the installation axis of the shoe pressure roller and the installation axis of the vacuum roller is at an angle of 8°-12° to the vertical.

3. The compact shoe press device for toilet paper machine according to claim 2, characterized in that: After the vacuum roller is installed, the connecting line of the installation axis of the shoe pressure roller and the installation axis of the vacuum roller is at an angle of 10° to the vertical.

4. The compact shoe press device for a toilet paper machine according to claim 1, characterized in that: After the vacuum roller is installed, the installation axis of the Yankee dryer and the installation axis of the vacuum roller are at an angle of 48°-53° to the horizontal.

5. The compact shoe press device for a toilet paper machine according to claim 4, characterized in that: After the vacuum roller is installed, the installation axis of the Yankee dryer and the installation axis of the vacuum roller are at an angle of 51° to the horizontal.

6. The compact shoe press device for toilet paper machine according to claim 1, characterized in that: Felt 1 and felt 2 have an overlapping section in pressing zone 2.

7. The method for operating a compact shoe press device for a toilet paper machine according to claim 1, characterized in that: These include: The working method of the compact shoe press device of the toilet paper machine is double-blanket pressing, in which one blanket operates in the pressure zone between the vacuum roller and the Yankee dryer; the other blanket operates in the pressure zone between the vacuum roller and the shoe press roller; the vacuum roller is belt-driven and rotates during operation; the shoe press roller is fixedly installed, and the shoe sleeve is set on the surface of the shoe press roller, and the shoe sleeve rotates with the vacuum roller.

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