CN118498107A

CN118498107A - Household paper manufacturing equipment

Info

Publication number: CN118498107A
Application number: CN202410439408.2A
Authority: CN
Inventors: 张力国; 戚剑青; 陈阳
Original assignee: Taisheng Suzhou Daily Necessities Co ltd
Current assignee: Taisheng Suzhou Daily Necessities Co ltd
Priority date: 2024-04-12
Filing date: 2024-04-12
Publication date: 2024-08-16

Abstract

The present invention provides a tissue paper manufacturing apparatus for manufacturing a tissue paper web, characterized by comprising: a forming section for forming a wet paper web; a press section including a press assembly including a main press roll and first and second press rolls, the wet paper web passing through the first and second press zones to form a pressed paper web; a drying part comprising a drying cylinder and a scraper; the forming section further includes a first press roll, a first fabric belt on the second press roll and supporting the wet paper web through the first press zone and the second press zone, the press section further includes a second fabric belt wound on the main press roll and transferring the pressed paper web formed after passing through the first press zone and the second press zone to the drying cylinder, and the press assembly includes an intermediate press zone between the first press zone and the second press zone and clamped by the first fabric belt and the second fabric belt, so that a gradient dewatering effect can be formed for paper sheets with high basis weight and high thickness, the dewatering efficiency is improved, and better surface roughness can be formed.

Description

Household paper manufacturing equipment

Technical Field

The present invention relates to a manufacturing apparatus for manufacturing household paper.

Background

The household paper is widely applied to daily life of people, and with the improvement of living standard, people increasingly use household paper products such as kitchen paper and the like, and the products generally have larger basis weight and thicker handfeel.

In order to make the household paper have a thicker and more 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 meanwhile, in order to further improve the performance of the household paper obtained by the traditional DCT technology, the TAD technology is combined with or improved to the traditional DCT technology, such as the NTT technology and the ATMOS technology, so as to realize lower energy consumption and higher bulk of the paper.

These devices are used for making household paper as shown in CN103890264A, US6743339B1, but in addition to a thick hand, it is desirable to have a better wiping effect, i.e. a rougher surface, for wiping products for kitchen paper and the like, and in addition, such household paper needs to have a larger basis weight, such as a single layer with a basis weight of 30 g/square meter, 40 g/square meter and even 50 g/square meter-70 g/square meter, but in such a large basis weight, the dewatering capacity in the pressing process is still insufficient in the prior art, resulting in a larger energy consumption in the later stage, and for this reason, an improved technical solution is required to solve the above-mentioned technical problem.

Disclosure of Invention

To this end, the present invention provides a household paper manufacturing apparatus to solve the above technical problems.

A tissue making apparatus 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 includes a first fabric belt disposed on the first and second press rolls and supporting the wet paper web through the first and second press zones, the press section further includes a second fabric belt disposed on the main press roll and transferring the press paper web formed after passing through the first and second press zones to the drying cylinder, and the press assembly includes an intermediate press zone disposed between the first and second press zones and sandwiched by the first and second fabric belts.

The main press roll comprises a rigid side wall and a containing space surrounded by the rigid side wall, wherein the rigid side wall comprises a plurality of through holes penetrating through the thickness direction of the rigid side wall, a first adsorption box is arranged in the containing space and comprises an adsorption cavity, the adsorption cavity comprises a first adsorption port, and the first adsorption port is arranged corresponding to the middle press area and is configured to enable the middle press area to be in a negative pressure state.

The second fabric belt comprises a base body part, and a plurality of small holes are formed in the base body part.

The first press roll applies a first pressure to the main press roll in the first press area, and the second press roll applies a second pressure to the main press roll in the second press area, wherein the first pressure is more than or equal to 330KN/m, and the second pressure is more than or equal to 450KN/m.

The accommodating space also comprises a first inner bellows corresponding to the first squeezing area, and the first inner bellows is configured to blow out air flow towards the first squeezing area.

The accommodating space also comprises a second adsorption box corresponding to the second squeezing area, the second adsorption box comprises a second adsorption port, and the second adsorption port is arranged corresponding to the second squeezing area and is configured to enable the second squeezing area to be in a negative pressure state.

The press assembly further comprises an outer air box which is arranged corresponding to the middle press area, the outer air box comprises an air outlet which faces the middle press area, and the air outlet is configured to blow hot air flow towards the middle press area.

The press assembly comprises an intermediate press device arranged corresponding to the intermediate press zone, the intermediate press device comprises a plurality of third press rolls and press belts wound on the third press rolls, the press belts comprise intermediate zones abutting against the intermediate press zone, and the third press rolls are configured to apply third pressure to the first fabric belt in the intermediate zones.

The first press roll applies a first pressure to the main press roll in the first press area, the second press roll applies a second pressure to the main press roll in the second press area, and the third pressure is smaller than the first pressure and the second pressure.

The squeezing belt is a steel belt, and a plurality of vent holes are formed in the squeezing belt.

The beneficial effects are that: the present invention provides a tissue paper manufacturing apparatus for manufacturing a tissue paper web, characterized by 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 part also comprises a first press roll and a second press roll, a first fabric belt is arranged on the first press roll and the second press roll and used for supporting the wet paper web to pass through the first press area and the second press area, the press part also comprises a second fabric belt which is wound on the main press roll and used for transferring the pressed paper web formed after passing through the first press area and the second press area to a drying cylinder, and the press assembly comprises an intermediate press area which is positioned between the first press area and the second press area and clamped by the first fabric belt and the second fabric belt, so that the gradient dewatering effect can be formed for paper sheets with high basis weight and high thickness, the dewatering efficiency is improved, the energy consumption is saved, and better surface roughness can be formed.

Drawings

FIG. 1 is a schematic diagram of a household paper manufacturing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the press assembly of FIG. 1;

FIG. 3 is a schematic view of a wet paper web in a press section;

FIG. 4 is a schematic view of a press assembly according to another embodiment;

illustration of the elements:

A forming section 10; a headbox 11; a forming roll 12; a breast roll 13; a forming wire 14; a first fabric strip 15; a front carrier roller 151; a second fabric strip 16; a base portion 160; an aperture 161; a press section 20; a press assembly 200; a first press roll 21; a first press zone 210; a second press roll 22; a second press zone 220; a press bellows 221; a main press roll 23; a rigid sidewall 230; the accommodation space 2300; a through hole 231; a first inner bellows 232; a first adsorption tank 233; a first adsorption port 2331; a second adsorption tank 234; an outer bellows 24; an intermediate press zone 240; a drying section 30; a drying cylinder 31; a gas hood 32; a scraper 33; a wet paper web 401; pressing the web 402; drying the web 403; a tissue web 404; a third press roll 541; press belt 542.

Detailed Description

Referring to fig. 1, an embodiment of the present invention provides a tissue making apparatus for making tissue webs 404, the tissue webs 404 having a basis weight of 10-80 g/m ², particularly suitable for making tissue webs 404 having a basis weight of 30-75 g/m ², more preferably the tissue webs 404 having a basis weight of 42-55 g/m ², while the tissue webs 404 are creped webs formed of cellulosic fibers, and further the tissue webs 404 may have a thickness of 100-500 μm, or further a thickness of 150-350 μm.

The equipment for manufacturing the household paper comprises a forming part 10, a pressing part 20 and a drying part 30.

The forming section 10 comprises a headbox 11, a forming roll 12, a forming wire 14 and a first fabric belt 15, wherein the headbox 11 is used for spraying a cellulose fiber suspension onto the forming wire 14, at least a part of the forming roll 12 is covered by the first fabric belt 15 and dewatering the cellulose fiber suspension, the first fabric belt 15 takes the shape of an endless loop, at least a part of the first fabric belt 15 is covered on the forming roll 12 and supports a wet paper web 401 to move, at least a part of the forming wire 14 is attached to the first fabric belt 15 covered on the forming roll 12 to form a clamping area, and the partially dewatered cellulose fiber suspension passes through the clamping area to form the wet paper web 401.

It will be appreciated that on one side of the nip, the forming wire 14 forms a forming zone with the first fabric strip 15, the headbox 11 comprises a number of spray heads for spraying the cellulosic fibrous suspension onto the forming wire 14, and that, in general, the location of the cellulosic fibrous suspension spray onto the forming wire 14 is referred to as the landing point, which is spaced apart from the nip.

It will be appreciated that the forming wire 14 is wound around a plurality of forming rolls and is endless so that the forming wire 14 circulates, the first fabric strip 15 is wound around a plurality of first rolls, which include breast rolls 13.

The press section 20 is disposed downstream of the forming section 10 and includes a press assembly 200, wherein the press assembly 200 includes a main press roll 23, a first press roll 21, and a second press roll 22, wherein the first press roll 21 cooperates with the main press roll 23 to form a first press zone 210, the second press roll 22 cooperates with the main press roll 23 to form a second press zone 220, the cooperation being such that a first pressure is applied to the wet web 401 passing through the first press zone 210 by the first press roll 21 and the main press roll 23, and a second pressure is applied to the wet web 401 passing through the second press zone 220 by the second press roll 22 and the main press roll 23.

In this embodiment, the first press roll 21, the second press roll 22 and the main press roll 23 are rolls having a coating layer, and these coating layers may be polyurethane coating layers. In other embodiments, the first press roll 21 and the second press roll 22 may be shoe presses, specifically, the main press roll 23 is a rigid roll or a roll with a coating layer, and the first press roll 21 and the second press roll 22 include a shoe, an endless belt sleeved outside the shoe, and an application assembly for driving the endless belt to run, and being positioned inside the shoe, and applying pressure to the shoe.

The press section 20 also includes a second fabric strip 16 wound around a plurality of idlers and main press rolls 23, the second fabric strip 16 passing through the first press section 210 and the second press section 220 and transferring the press web 402 formed after passing through the first press section 210 and the second press section 220 to a downstream direction.

It will be appreciated that the second fabric strip 16 is also endless so as to be capable of being endless.

It will be appreciated that the first fabric belt 15 also passes through the first press section 210 and the second press section 220, and that the first fabric belt 15 and the second fabric belt 16 form a nip configuration for the wet paper web 401 in the first press section 210, the second press section 220, and the area between the first press section 210 and the second press section 220, the area between the first fabric belt 15 and the second fabric belt 16 between the first press section 210 and the second press section 220 will be referred to as the intermediate press section 240 for convenience of description, and that the wet paper web 401 is dewatered by pressure in the first press section 210, the second press section 220, and the intermediate press section 240, specifically, the first press roll 21 applies a first pressure to the main press roll 23, the water on the wet paper web 401 is dewatered, the second press roll 22 applies a second pressure to the main press roll 23 in the second press section 220, the dewatering of the pressed wet paper web 401 is achieved by applying pressure to the first fabric 15 and the second fabric 16 in the intermediate press section 240, and typically, the second pressure is set to be greater than the first pressure so that the web is dewatered more efficiently, especially for high basis weight and high caliper sheets, in a step-wise dewatering, it has been found that after passing through the first press section 210, the fibers are compacted and the fibers rebound themselves to increase the voids between the fibers due to the reduced pressure in the intermediate press section 240, and then the wet paper web 401 is pressed again through the second press section 220 to achieve dewatering, which results in an average dewatering efficiency of 5.2% for Gao Jichong, such as a tissue web 404 above 42g/m ², can improve dewatering efficiency by an average of 7.7%.

Further, the first pressure may be 330KN/m or more and the second pressure is 450KN/m or more, and in a preferred embodiment, the first pressure is 350-420 KN/m and the second pressure is 500-550 KN/m, in which case, compared with the conventional high pressure of 600KN/m or more used for single pressing, the above arrangement can reduce the occurrence of the crushing or dead streak phenomenon on the paper sheet.

Further, the wet paper web 401 has a dryness of 15 to 30%, the press paper web 402 has a dryness of 45 to 70%, and further, the wet paper web 401 has a dryness of 25 to 40% after passing through the first press zone 210, and the press paper web 402 is formed after passing through the second press zone 220.

Further, the first press section 210 includes a front idler 151 upstream thereof, the first fabric belt 15 is wound around the front idler 151, the first fabric belt 15 includes a first press section between the first press section 210 and the front idler 151, an included angle between the first press section and the second fabric belt 16 is 18 ° to 32 °, and the first fabric belt 15 includes a second press section downstream of the second press section 220, an included angle between the second press section and the second fabric belt is 18 ° to 32 °, so that the wet paper web can easily enter the first press section 210, and the pressed paper web can easily be separated from the first fabric belt 15 and move along with the second fabric belt 16.

Further, the main press roll 23 includes a rigid sidewall 230 and a receiving space 2300 surrounded by the rigid sidewall 230, the rigid sidewall 230 includes a plurality of through holes 231 penetrating through the thickness direction of the rigid sidewall 230, and meanwhile, the rigid sidewall 230 can rotate around its axis under the driving of the driving device, in the receiving space 2300, a first suction box 233 is disposed, the first suction box 233 includes a suction chamber, the suction chamber includes a first suction opening 2331, the first suction opening 2331 is disposed corresponding to the middle press area 240, so that the middle press area 240 is in a negative pressure state, and it can be understood that the suction chamber is connected with a negative pressure device, in this case, the wet paper web 401 forms a dewatering effect under the negative pressure when being in the middle press area 240.

Further, the accommodating space 2300 further includes a first inner bellows 232 corresponding to the first press area 210, and the first inner bellows 232 is configured to blow air toward the first press area 210 to further assist in dewatering during the pressing process.

Further, the first inner bellows 232 blows a hot air flow to the first press section 210, and at the same time, an adsorption device is disposed in the first press roll 21, so that the removed water is discharged from the adsorption device in the first press roll 21 to the outside of the press assembly 200.

It will be appreciated that the air flow from the first inner windbox 232 is directed from the main press roll 23 toward the first press roll 21, and serves in three ways, one to assist in dewatering, one to enable the wet paper web 401 to remain attached to the first fabric belt 15 in the first press zone 210 and move with the first fabric belt 15, and one to enable the hot air flow to act directly on the wet paper web 401 through the second fabric belt 16 for better dewatering and drying due to the generally greater thickness of the first fabric belt 15 and the provision of apertures 161 in the second fabric belt 16.

Referring to fig. 3, the second fabric 16 includes a base portion 160, and a plurality of small holes 161 are formed in the base portion 160, and it is understood that the small holes 161 practically have two functions, that is, one of them is to make the air flow blown by the first inner air box 232 directly act on the wet paper web 401,

And, water that has been removed from the wet paper web 401 can be introduced into the first suction box 233 through the small holes 161 and discharged from the first suction box 233, and secondly, the wet paper web 401 can be formed into a rougher surface through the small holes 161.

It will be appreciated that the apertures 161 have a pore size of 1mm or less to avoid crushing of the apertures 161 in a partial area of the surface of the wet paper web 401 during the pressing process.

Further, the accommodating space 2300 further includes a second suction box 234 corresponding to the second press area 220, the second suction box 234 includes a second suction opening, the second suction opening is disposed corresponding to the second press area 220, and the second press area 220 is in a negative pressure state, so as to facilitate dehydration in the second press area 220, that is, in the second press area 220, the direction of air flow is from the second press area 220 to the direction of the second suction box 234, that is, the direction of air flow is opposite to the direction of air flow in the first press area 210, so that the air flow plays two roles: one is to aid in the removal of moisture from the wet paper web 401, and the other is to facilitate transfer of the press web 402 with the assistance of air flow from moving along with the first fabric belt 15 to moving along with the second fabric belt 16, i.e., in the case where the second fabric belt 16 may not be as smooth as necessary as in the prior art, but where the second fabric belt 16 is roughened, the press web 402 can still be separated from the first fabric belt 15 and attached to the second fabric belt 16 to move along with the second fabric belt 16.

Further, the press assembly 200 also includes an outer blower 24 disposed in correspondence with the intermediate press section 240, the outer blower 24 including an air outlet toward the intermediate press section 240, the air outlet being configured to blow a flow of hot air toward the intermediate press section 240 to further enhance the dryness of the pressed web 402.

Further, the second press roll 22 also includes a press box 221 disposed within the second press roll 22, the press box 221 including an air outlet toward the second press zone 220 and configured to blow an air stream toward the second press zone 220 to further assist in dewatering and separating the press web from the first fabric strip 15.

Referring to fig. 4 together, in the second embodiment, the press assembly includes an intermediate press device disposed corresponding to the intermediate press zone 540, the intermediate press device includes a plurality of third press rolls 541 and a press belt 542 wound around the plurality of third press rolls 541, the press belt 542 includes an intermediate zone abutting the intermediate press zone 540, and the third press rolls 541 are configured to apply a third pressure to the first fabric strip in the intermediate zone, so that a larger press area is provided in the intermediate press zone 540, thereby forming a better dewatering effect.

Further, the press belt 542 is a steel belt.

Further, the press belt 542 is provided with a plurality of ventilation holes.

Further, the third pressure is less than the first pressure and the second pressure.

Further, in the forming section 10, a plurality of auxiliary dewatering devices are further provided, which may be, in general, vacuum dewatering rolls or vacuum dewatering boxes, and more specifically, vacuum dewatering boxes having an adsorption space in communication with the negative pressure device, wherein the adsorption space includes an adsorption port adjacent to and facing the first fabric belt 15, and water in the first fabric belt 15 and the wet paper web 401 is sucked and collected by the adsorption port, so as to improve the dryness of the wet paper web 401 before entering the first press section 210.

Further, a heating device may be provided in press section 20 and configured to increase the dryness of press web 402 by passing a hot air stream, which may be a high temperature steam stream or a hot air stream.

Further, the heating device includes a hot air box and an adsorption box opposite to the hot air box, the hot air box and the adsorption box are respectively disposed at the outer side of the press paper web 402 and the inner side of the second fabric belt 16, the hot air box includes an air flow opening, the adsorption box includes an adsorption port, and the hot air flows from the air flow opening to the adsorption port after passing through the press paper web 402 and the second fabric belt 16, in this case, on one hand, the dryness of the press paper web 402 can be further improved, the energy consumption of the subsequent treatment of the drying part 30 can be reduced, on the other hand, the press paper web 402 can be kept attached to the second fabric belt 16 to run, and on the other hand, it can be understood that the heating device is disposed in the downstream direction of the press assembly 200.

The dryer section 30 includes a dryer cylinder 31 that dries a press web 402 to form a dried web 403 and a doctor 33 that crepes the dried web 403 to form a tissue web 404.

It will be appreciated that the dryer cylinder 31 includes an outer drying surface for applying and drying the press web 402, the press section 20 further includes a transfer roll for applying the second fabric strip 16 to the outer drying surface, and the transfer roll applies a pressure to the dryer cylinder 31 to form a press section, and the press web 402 is transferred and applied to the outer drying surface after passing through the press section.

It will be appreciated that the transfer roll is positioned on the inside of the second fabric strip 16 such that the outside of the second fabric strip 16 is brought into contact with the outer drying surface to transfer the press web 402 to the outer drying surface.

Further, in order to allow easy transfer of the press web 402 to the outer drying surface, which has a smooth surface, it is also possible to spray adhesive material such as a cylinder patch onto the outer drying surface.

The doctor blade 33 is arranged downstream of the drying and at least one portion of the doctor blade 33 remains attached to the outer drying surface such that the formed dried web 403 impinges on the doctor blade 33 forming a crepe and eventually forming a creped tissue web 404.

The doctor blade 33 may be made of steel, cemented carbide or a hard ceramic material, without limitation.

In addition, the cylinder 31 is externally provided with a hood 32, and the hood 32 is filled with a medium for drying the pressed web 402, such as high-temperature steam, hot air, etc.

Further, the first fabric belt 15 and the second fabric belt 16 run at the same speed.

The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. A tissue making apparatus for making a tissue web comprising:

a forming section for forming a wet paper web;

2. The paper making apparatus of claim 1, 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 a first suction box is disposed in the receiving space, the first suction box includes a suction chamber, the suction chamber includes a first suction port, and the first suction port is disposed corresponding to the middle press area and configured to make the middle press area in a negative pressure state.

3. The tissue making apparatus as defined in claim 2 wherein said second web includes a base portion, said base portion having a plurality of apertures disposed therein.

4. The paper manufacturing apparatus according to claim 2, 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 330KN/m or more and the second pressure being 450KN/m or more.

5. The tissue making apparatus of claim 2 wherein the receiving space further comprises a first inner blower associated with the first press section, the first inner blower being configured to blow air in a direction toward the first press section.

6. The paper making apparatus for daily use according to claim 2, wherein the accommodating space further comprises a second suction box corresponding to the second press area, the second suction box comprising a second suction port, the second suction port being disposed corresponding to the second press area and configured to make the second press area in a negative pressure state.

7. The tissue making apparatus of claim 2 wherein the press assembly further comprises an outer blower disposed in correspondence with the intermediate press section, the outer blower including an air outlet directed toward the intermediate press section, the air outlet being configured to blow a flow of hot air toward the intermediate press section.

8. The tissue paper manufacturing apparatus of claim 2 wherein the press assembly includes an intermediate press device disposed in correspondence with the intermediate press section, the intermediate press device including a plurality of third press rolls and a press belt wound around the plurality of third press rolls, the press belt including an intermediate section abutting the intermediate press section, the third press rolls being configured to apply a third pressure to the first fabric belt in the intermediate section.

9. The paper manufacturing apparatus of claim 8, wherein the first press roll applies a first pressure to the main press roll in the first press zone, the second press roll applies a second pressure to the main press roll in the second press zone, and the third pressure is less than the first pressure and the second pressure.

10. The paper making apparatus for household use as claimed in claim 8, wherein the press belt is a steel belt, and a plurality of ventilation holes are provided in the press belt.