CN113981620A

CN113981620A - Preparation method of reproduced fluff pulp board

Info

Publication number: CN113981620A
Application number: CN202111223490.8A
Authority: CN
Inventors: 夏双印; 陈广岩; 刘立坚; 沈欢
Original assignee: Shanghai Foliage Industry Co ltd
Current assignee: Shanghai Foliage Industry Co ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-01-28

Abstract

The invention provides a method for preparing a reproduced fluff pulp board, which comprises the steps of obtaining different first fibers and second fibers, carrying out air flow conveying, forming mixed fibers in a mixer, stacking the mixed fibers in a supporting net to form a net-shaped structure, applying pressure to the net-shaped structure to form a compact sheet-shaped structure, wherein the mixer comprises a shell, at least one air flow conveying channel is configured to introduce air flow into an accommodating space along the tangential direction of the edge of the shell, and enable the accommodating space to form negative pressure, and the first fibers and the second fibers enter the accommodating space under the action of the negative pressure to form the mixed fibers. Therefore, when the secondary crushing is carried out, the required energy is greatly reduced, and the noise in the production process is also greatly controlled.

Description

Preparation method of reproduced fluff pulp board

Technical Field

The application relates to a preparation method of a fluff pulp board, in particular to a preparation method of a reproduced fluff pulp board.

Background

Disposable absorbent articles such as sanitary napkins, breast pads, and diapers are widely used in daily life, and generally include an absorbent body capable of rapidly absorbing liquid, which is generally formed by crushing fluff pulp sheets, and then depositing and stacking dispersed fibers.

The existing fluff pulp board is usually formed by fibers with a certain specific length range, when an absorber is formed, the production site is crushed to form dispersed fibers, along with the improvement of living standard, people increasingly diversify the product forms of disposable absorbing products, and the existing fluff pulp board with a single form can not adapt to the requirements of different product forms.

Disclosure of Invention

In view of the above-mentioned deficiencies in the prior art, the present application provides a method of making a remanufactured fluff pulp sheet to form a remanufactured fluff pulp sheet having different fibers and structural configurations to accommodate a variety of product needs.

A method for preparing a reproduced fluff pulp board comprises the following steps,

s1: respectively crushing the first fluff pulp board and the second fluff pulp board to obtain first fibers and second fibers, wherein the first fibers and the second fibers are different in form, length or thickness;

s2: conveying the first fiber and the second fiber by air flow;

s3: mixing first fibers and second fibers in a mixer to form mixed fibers, and stacking the mixed fibers in a support net to form a net-shaped structure, wherein the mixer comprises a shell with an accommodating space, at least one airflow conveying channel is configured to introduce airflow into the accommodating space along the tangential direction of the edge of the shell, so that negative pressure is formed in at least one part of the accommodating space, and the first fibers and the second fibers enter the accommodating space under the action of the negative pressure to form mixed fibers;

s4: and applying pressure to the net-shaped structure to form a compact sheet-shaped structure, wherein the sheet-shaped structure is a reproduced fluff pulp board.

Further, the first fiber is softwood fiber, the fiber length is about 4-7mm, the second fiber is softwood fiber, the fiber length is 2-4mm, the first fluff pulp board is an untreated fluff pulp board, and the second fluff pulp board is a fully-treated fluff pulp board.

Further, the mass ratio of the first fibers to the second fibers is 1-8: 1-2.

Furthermore, the casing include the cylinder type lateral wall, the casing on still be provided with first conveyer pipe, second conveyer pipe, fibre export and air current conveyer pipe, wherein first conveyer pipe is connected with first reducing mechanism, including a first transfer passage of first reducing mechanism export of intercommunication and accommodation space, the second conveyer pipe is connected with second reducing mechanism to including a second transfer passage of intercommunication second reducing mechanism export and accommodation space, the fibre export set up in the below of casing for through this fibre export pile up the mixed fibre to the support net that is located directly below the blender, air current conveyer pipe set up on the cylinder type lateral wall, first conveyer pipe, second conveyer pipe are close to the blender axis setting.

Further, the blender in still be provided with a Y type conveyer pipe, Y type conveyer pipe include first manifold, second manifold and stretch into the pipe, stretch into the export of pipe and extend to and flush with the export of air delivery pipe, first manifold and first conveyer pipe intercommunication, second manifold and second conveyer pipe intercommunication.

Further, the axis of the extending pipe is coincident with the axis of the mixer.

Furthermore, the air flow conveying pipe forms an included angle with the horizontal direction, and if the included angle is alpha, the alpha is 1-10 degrees.

Further, the cylinder-type lateral wall include straight section of thick bamboo section and shrink section, wherein, the shrink section be a awl tube-shape, including the link of being connected with straight section of thick bamboo section and keeping away from the exit end of straight section of thick bamboo section, wherein, the fibre export set up at the exit end, just, the cross sectional area of exit end is less than the cross sectional area of link.

Furthermore, the inner wall of the contraction section also comprises a fin.

Further, a negative pressure device is provided below the supporting net, and in step S4, the web-shaped structure is passed through a pair of rollers having slits to form a sheet-shaped structure.

Has the advantages that: the invention provides a preparation method of a remade fluff pulp board, which comprises the steps of obtaining different first fibers and second fibers, carrying out air flow conveying, forming mixed fibers in a mixer, stacking the mixed fibers in a supporting net to form a net-shaped structure body, wherein the mixer comprises a shell with an accommodating space, at least one air flow conveying channel is configured to introduce air flow into the accommodating space along the tangential direction of the edge of the shell, and enabling at least one part of area in the accommodating space to form negative pressure, the first fibers and the second fibers enter the accommodating space under the action of the negative pressure and form the mixed fibers, applying pressure to the net-shaped structure body to form a compact sheet-shaped structure body, the sheet-shaped structure body is a remade fluff pulp board, on one hand, the remade fluff pulp board is formed by mixing different fibers in the first fluff pulp board and the second fluff pulp board, and can be used for meeting the requirements different from the conventional products, on the other hand, because first fine hair pulp board and second fine hair pulp board have all passed through primary crushing device and have smashed at the production site, consequently when carrying out the regrinding, the energy that needs will reduce by a wide margin, and the noise in the production process also obtains very big control simultaneously.

Drawings

FIG. 1 is a flow chart of a method of preparation of an embodiment of the present application;

FIG. 2 is a schematic view of an apparatus to which the production method is applied;

FIG. 3 is a schematic cross-sectional view taken at A-A in FIG. 2;

FIG. 4 is a schematic cross-sectional view taken at B-B of FIG. 2;

FIG. 5 is a schematic diagram of a mixer in another embodiment.

Illustration of the symbols:

a first fluff pulp sheet 11; a second fluff pulp sheet 12; a first crushing device 21; a second crushing device 22; a first delivery pipe 31; a first conveyance path 310; a second delivery pipe 32; a second conveyance path 320;

a mixer 40; a housing 400; a straight barrel section 401; a constriction 402; a fiber outlet 403; an accommodating space 41; an air flow duct 42; an airflow delivery passage 420; the fins 43; a first manifold 441; a second manifold 442; the extension tube 443;

a support net 50; a negative pressure device 60; and a press roll 70.

Detailed Description

The present application will be described in further detail with reference to examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

In the description of the present application, it is noted that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

Referring to fig. 1, an embodiment of the present invention provides a method for preparing a reproduced fluff pulp sheet, including:

s1: respectively crushing the first fluff pulp board 11 and the second fluff pulp board 12 to obtain first fibers and second fibers, wherein the first fibers and the second fibers are different in form, length or thickness;

referring to fig. 2, fig. 2 shows an apparatus for implementing the preparation method, the apparatus includes a first crushing device 21 and a second crushing device 22 for crushing the first fluff pulp sheet 11 and the second fluff pulp sheet 12, respectively, and typically, the first crushing device 21 and the second crushing device 22 each include a crushing roller with a plurality of teeth, the crushing roller is driven by a power device to rotate at a high speed, and the rotation speed of the crushing roller of the first crushing device 21 and the second crushing device 22 in this embodiment may be 1500r/min-6000 r/min.

The first crushing device 21 crushes the first fluff pulp sheet 11 to obtain first fibers, and the second crushing device 22 crushes the second fluff pulp sheet 12 to obtain second fibers, wherein the first fibers and the second fibers have different shapes, lengths or thicknesses, and preferably, the first fibers and the second fibers have different shapes, lengths and thicknesses.

Specifically, the first fibers and the second fibers may be softwood fibers or hardwood fibers, in one embodiment, the first fibers are softwood fibers having a fiber length of about 4-7mm, the second fibers are also softwood fibers having a fiber length of 2-4mm, the first fluff pulp sheet 11 is an untreated fluff pulp sheet, and the second fluff pulp sheet 12 is a fully treated fluff pulp sheet, wherein the untreated fluff pulp sheet is a fluff pulp sheet that conforms to the definition of fully treated pulp and untreated pulp in GB/T21331, and it can be understood that the first fluff pulp sheet 11 and the second fluff pulp sheet 12 also conform to the performance index requirements for fluff pulp in GB/T21331.

Preferably, the feeding rates of the first and second pulverizers are the same or different, so that the pulverization yields different ratios of the first fibers to the second fibers.

Preferably, when the first fibers are long fibers and the second fibers are short fibers, the mass ratio of the first fibers to the second fibers is preferably 1-8: 1-2.

S2: conveying the first fiber and the second fiber by air flow;

s3: mixing the first fiber and the second fiber in a mixer 40 to form a mixed fiber, and stacking the mixed fiber on a supporting net 50 to form a net-shaped structure, wherein the mixer 40 comprises a housing 400 having an accommodating space 41, at least one air flow conveying channel 420 is configured to introduce air flow into the accommodating space 41 along a tangential direction of an edge of the housing 400, and a negative pressure is formed in at least a part of an area of the accommodating space 41, and the first fiber and the second fiber enter the accommodating space 41 under the action of the negative pressure to form the mixed fiber.

Referring to fig. 2 and 3, in the present embodiment, the mixer 40 includes a housing 400, the housing 400 includes a cylindrical sidewall and a top plate connected to the cylindrical sidewall, the cylindrical sidewall and the top plate surround to form an accommodating space 41, the housing 400 is further provided with a first delivery pipe 31, a second delivery pipe 32, a fiber outlet 403 and an air delivery pipe 42, wherein the first delivery pipe 31 is connected to the first crushing device 21 and includes a first delivery passage 310 communicating the outlet of the first crushing device 21 with the accommodating space 41, similarly, the second delivery pipe 32 is connected to the second crushing device 22 and includes a second delivery passage 320 communicating the outlet of the second crushing device 22 with the accommodating space 41, the fiber outlet 403 is disposed below the housing 400, for stacking the mixed fibers through the fiber outlet 403 onto the supporting net 50 located right below the mixer 40, wherein the first conveying pipe 31 and the second conveying pipe 32 are both disposed on the top plate, the air conveying pipe 42 is disposed on the cylindrical side wall and includes an air conveying passage 420 communicating with the accommodating space 41, the air conveying passage 420 is configured to introduce air into the accommodating space 41 along a tangential direction of the edge of the housing 400, so that the introduced air moves along the inner side edge of the cylindrical side wall, and the air forms a negative pressure in the middle of the mixer 40 according to bernoulli's principle, so that the first fibers and the second fibers are sucked into the mixer 40, it can be understood that the first conveying pipe 31 and the second conveying pipe 32 are disposed adjacent to the axis of the mixer 40, and it can be understood that, in this case, there is no need to dispose a positive pressure air conveying device upstream of the first crushing device 21 and the second crushing device 22, under the action of negative pressure in the mixer 40, the first fibers and the second fibers can be stably fed, and when entering the mixer 40, the first fibers and the second fibers move along with the air flow, so that the mixing is realized to form the mixed fibers.

Further, referring to fig. 5, in another embodiment, a Y-shaped delivery pipe is disposed in the mixer 40, the Y-shaped delivery pipe includes a first manifold 441, a second manifold 442 and an extending pipe 443, an outlet of the extending pipe 443 extends to be flush with an outlet of the air flow delivery pipe 42, so that the outlet of the extending pipe 443 directly extends into the negative pressure region in the mixer 40, and it can be understood that the first manifold 441 is communicated with the first delivery pipe 31, and the second manifold 442 is communicated with the second delivery pipe 32.

Further, the axis of the inlet pipe 443 coincides with the axis of the mixer 40.

Further, the air delivery tube 42 is at an angle to the horizontal, and if the angle is α, α is 1 ° to 10 °, more preferably 2 °, 3 °, 4 °, 5 °.

Further, the cylindrical side wall includes a straight cylinder section 401 and a contraction section 402, wherein the contraction section 402 is in a conical cylinder shape, and includes a connection end connected with the straight cylinder section 401 and an exit end far away from the straight cylinder section 401, wherein the fiber outlet 403 is arranged at the exit end, and the cross-sectional area of the exit end is smaller than that of the connection end, so that the airflow can carry the mixed fibers to move along the support net 50 right below the fiber outlet 403 after mixing the first fibers and the second fibers, and the mixed fibers can be stacked to form a net-shaped structure.

It will be appreciated that the constriction 402 has a taper, preferably a taper of 10-25.

Further, referring to fig. 4, the inner wall of the contraction section 402 further includes fins 43, so that the air flow forms turbulence when passing through the fins 43, which enhances the mixing of the first fibers and the second fibers, and the fins 43 are inclined to the moving direction of the air flow or perpendicular to the moving direction of the air flow.

It is understood that an air blowing device is further disposed upstream of the air delivery pipe 42 to deliver the air flow into the accommodating space 41 through the air delivery channel 420, and the air blowing device may be various air compressors in the prior art, such as a ram air compressor, a rotz air pump, a centrifugal air pump, and an axial flow air pump. Of course. It is also possible to supply a gas flow into the accommodating space 41 through the gas flow conveying channel 420 by supplying a gas with a predetermined pressure, such as a high-pressure gas generated by a heat engine, specifically, a high-pressure steam generated by a boiler, a high-pressure exhaust gas generated by an internal combustion engine, and the like. If the air flow conveyed into the accommodating space 41 by the air flow conveying channel 420 is high-pressure steam generated by a boiler, the high-pressure steam can be further dehydrated, and then the treated high-pressure gas is provided for the air flow conveying channel 420.

It will be understood that the supporting net 50 is disposed right below the fiber outlet 403 for supporting and transferring the net-shaped structure, and preferably, a negative pressure device 60 may be further disposed below the supporting net 50 to further move the mixed fibers right below and stack the mixed fibers on the supporting net 50.

S4: applying pressure to the web structure to form a dense sheet structure.

In this embodiment, the web-like structure may be pressed by passing the web-like structure through a pair of press rolls 70 having slits to form a sheet-like structure, which is also referred to as a remanufactured fluff pulp sheet, but it is also possible that the web-like structure may be intermittently pressed by passing the web-like structure through a press that intermittently applies and maintains a pressure to the web-like structure, and that the web-like structure may also be formed into a dense sheet-like structure, typically having a density of not less than 15% of the density of the first fluff pulp sheet 11 or the second fluff pulp sheet 12.

It can be understood, in the actual production process, on the one hand because first fluff pulp board 11 and second fluff pulp board 12 all have passed through a reducing mechanism and smashed, consequently when carrying out the regrinding to refabrication fluff pulp board, the energy of needs will reduce by a wide margin, noise in the production process also obtains very big control simultaneously, on the other hand, because refabrication fluff pulp board is by the different fibre formation of mixing in first fluff pulp board 11 and the second fluff pulp board 12, can be used to satisfy the needs that are different from current conventional product.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.

Claims

1. A method for preparing a remade fluff pulp board is characterized by comprising the following steps,

s2: conveying the first fiber and the second fiber by air flow;

2. The method of making a remanufactured fluff pulp sheet of claim 1 wherein the first fibers are softwood fibers having a fiber length of about 4mm to about 7mm, the second fibers are softwood fibers having a fiber length of about 2 mm to about 4mm, and the first fluff pulp sheet is an untreated fluff pulp sheet and the second fluff pulp sheet is a fully treated fluff pulp sheet.

3. The method of making a reconstituted fluff pulp sheet according to claim 1, wherein the mass ratio of the first fibers to the second fibers is 1-8: 1-2.

4. The method of claim 1, wherein the housing comprises a tubular sidewall, and the housing further comprises a first duct, a second duct, a fiber outlet, and an air duct, wherein the first duct is connected to the first comminuting device and comprises a first duct communicating the outlet of the first comminuting device with the receiving space, the second duct is connected to the second comminuting device and comprises a second duct communicating the outlet of the second comminuting device with the receiving space, the fiber outlet is disposed below the housing for stacking the mixed fibers through the fiber outlet onto a support screen directly below the mixer, the air duct is disposed on the tubular sidewall, and the first duct and the second duct are disposed adjacent to the mixer axis.

5. The method of making a reconstituted fluff pulp sheet in accordance with claim 4, wherein a Y-shaped feed line is provided in the mixer, the Y-shaped feed line including a first manifold, a second manifold and an inlet line, the outlet of the inlet line extending flush with the outlet of the pneumatic feed line, the first manifold communicating with the first feed line and the second manifold communicating with the second feed line.

6. The method of making a reformed fluff pulp sheet of claim 5, wherein the axis of the infeed tube coincides with the axis of the mixer.

7. The method of making a reformed fluff pulp sheet of claim 4, wherein the air transport conduit is at an angle to the horizontal, and wherein α is from 1 ° to 10 ° if α is the angle.

8. The method of claim 4, wherein the tubular sidewall comprises a straight tubular section and a constricted section, wherein the constricted section is in the shape of a cone comprising a connecting end connected to the straight tubular section and an outlet end remote from the straight tubular section, wherein the fiber outlet is disposed at the outlet end, and the cross-sectional area of the outlet end is smaller than the cross-sectional area of the connecting end.

9. The method of making a reconstituted fluff pulp sheet according to claim 8, further comprising fins on the inner wall of the neck.

10. The method of making a reformed fluff pulp sheet according to claim 1, wherein a negative pressure device is further provided under the carrier web, and the web-shaped structure is formed into a sheet-shaped structure after passing through a pair of nip rollers in step S4.