Production process of deodorizing capsule core body, paper diaper and pull-ups

Abstract

The invention relates to the field of disposable hygienic products, and provides a production process of a deodorizing capsule core body, which comprises the following steps: conveying a polymer carrier, manufacturing a lower core body, manufacturing an upper core body, blanking first deodorizing particles, forming a core body main body, forming a plurality of core bodies on a plurality of forming areas at one time, and forming in only one forming bin and a mold box. A plurality of procedures are not needed, the length of equipment is shortened, energy is saved, the water-soluble film of the first deodorizing particles is dissolved in water, the deodorant can be released for deodorizing, and the deodorizing effect is improved; the urine groove and the excrement groove can separate urine from excrement, a large number of first deodorizing particles can be stored in the urine groove and the excrement groove, and the deodorizing effect is improved; the technical problem that the deodorizing effect of the core body is poor is solved.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary products, and in particular to a production process of a deodorizing capsule core, and diapers and pull-up pants. Background Art

[0002] When babies or adults wearing disposable sanitary products defecate or urinate, odor is likely to occur. Some existing disposable sanitary products use a deodorizing layer, which is only a thin layer and is difficult to deodorize a large area of ​​liquid, especially when urine and feces are mixed, a strong odor is generated, and the deodorizing effect is poor.

[0003] Chinese patent application number: 202022417028.9 discloses an antibacterial and deodorizing diaper, comprising a diaper, a rear waist piece, a front waist piece and a moisture-absorbing core, wherein the middle part of the diaper is provided with a moisture-absorbing core, and the front end of the moisture-absorbing core is provided with a front waist piece, and the rear end of the moisture-absorbing core is provided with a rear waist piece, an elastic waistband is provided in the middle and upper part of the front waist piece, an antibacterial and deodorizing layer is provided in the middle part of the upper surface of the moisture-absorbing core, and the left and right sides of the moisture-absorbing core are provided with anti-side leakage edges. The antibacterial and deodorizing diaper only uses one layer of antibacterial and deodorizing layer, which makes it difficult to deodorize a large area of ​​liquid, and the deodorizing effect is poor. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention proposes a production process of a deodorizing capsule core and diapers and pull-up pants, which solves the technical problem of poor deodorizing effect of the core.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A production process for a deodorizing capsule core, comprising the following steps:

[0007] S1. Polymer carrier delivery:

[0008] The driving device transports the core body, thereby driving the polymer carrier to move, and the driving device transports the polymer carrier to the polymer unloading device, and the driving device stops running;

[0009] The polymer feeding device comprises a molding bin and a mold box arranged at the bottom of the molding bin, a plurality of partitions are arranged in the molding bin, the partitions divide the feeding bin into a plurality of feeding bins, a SAP feeding box, a wood pulp feeding box and a first particle feeding box are arranged on the top of the molding bin; the SAP feeding box contains SAP, the wood pulp feeding box contains wood pulp, and the first particle feeding box contains first deodorizing particles, a template is arranged on the top of the mold box, a plurality of molding areas are arranged on the template, each molding area corresponds to one of the feeding bins, a plurality of adsorption holes are arranged on the molding area, a first adsorption area is arranged on each molding area in the mold box, a second adsorption area and a third adsorption area are formed to form a closed area in the first adsorption area, the second adsorption area is arranged along the length direction, the third adsorption area is arranged at the rear end of the second adsorption area, the first adsorption area, the second adsorption area and the third adsorption area are respectively connected to the first negative pressure device, the second negative pressure device and the third negative pressure device; all the first adsorption areas are connected to the same first negative pressure device, all the second adsorption areas are connected to the same second negative pressure device, and all the third adsorption areas are connected to the same third negative pressure device;

[0010] S2. Manufacturing the lower core:

[0011] The SAP unloading box and the wood pulp unloading box unload the SAP and the wood pulp, and adsorb the SAP and the wood pulp on the polymer carrier to form a lower core body;

[0012] S3. Manufacturing the upper core:

[0013] The SAP unloading box and the wood pulp unloading box unload SAP and wood pulp, start the first negative pressure device, close the second negative pressure device and the third negative pressure device, the negative pressure of the first negative pressure device unloads SAP and wood pulp to the top of the lower core body to form an upper core body, the upper core body forms a urine trough at the position of the second adsorption zone, and forms a feces trough at the position of the third adsorption zone;

[0014] S4. First deodorizing granule feeding:

[0015] The first particle discharge box discharges the first deodorizing particles, starts the second negative pressure device and the third negative pressure device, and closes the first negative pressure device, so that the first deodorizing particles can be discharged into the feces tank and the urine tank through the adsorption force;

[0016] S5. Forming the core body:

[0017] The driving device is started to pull out the formed core body, and the polymer carrier at the rear end is moved to the polymer unloading device for the next round of process.

[0018] Further:

[0019] The molding bin is also provided with a second particle discharge box. In step S2, the second particle discharge box discharges the second deodorizing particles, and the second deodorizing particles are mixed into SAP and wood pulp, so that the lower core has the second deodorizing particles.

[0020] The second deodorizing particles are gradually added, so that the second deodorizing particles at the top are more than those at the bottom.

[0021] In step S3, the second particle feeding box feeds the second deodorizing particles so that the upper core has the second deodorizing particles.

[0022] A fourth adsorption zone is provided in the third adsorption zone, and the fourth adsorption zone is located in the middle of the third adsorption zone. The fourth adsorption zone is connected to a fourth negative pressure device. When step S2 ends, only the fourth negative pressure device is started, and SAP and wood pulp are fed to the middle of the fecal liquid tank, so that a downwardly concave annular groove is formed around the fecal liquid tank, and a large number of first deodorizing particles can be concentrated and fixed in the annular groove.

[0023] After the annular groove is formed, only the third adsorption zone is activated, the first particle discharge box discharges the first deodorizing particles, and the third adsorption zone adsorbs the first deodorizing particles into the annular groove.

[0024] In both steps S2 and S4, the fourth negative pressure device is started.

[0025] The first deodorizing particles include a water-soluble film and a deodorizing agent coated in the water-soluble film.

[0026] The present invention provides a diaper based on the production process of the deodorizing capsule core, comprising a first liquid-permeable top layer, a core body, and a first liquid-impermeable bottom layer arranged from top to bottom.

[0027] The present invention provides pull-up pants based on the production process of the above-mentioned deodorizing capsule core, including a core body and an elastic waist connected to both ends of the core body, the top of the core body is provided with a second liquid-permeable top layer, and the bottom of the core body is provided with a second liquid-impermeable bottom layer.

[0028] By adopting the above technical solution, the beneficial effects of the present invention are:

[0029] The core body of the present invention is formed in a static manner, which is different from the traditional mobile forming method. One core body can be formed in each forming area, and multiple core bodies can be formed at one time in multiple forming areas. Although the core body structure is complex and has a urine trough and a feces trough on the top, by arranging multiple adsorption areas in the mold box and adopting a separate unloading method, it is only formed in one molding bin and mold box, and there is no need to adopt multiple processes, which shortens the length of the equipment and saves energy. Compared with the traditional structure of using cutting rollers to cut to form urine troughs and feces troughs, it can not only save polymer materials and does not need to collect the cut polymers, but also reduce the length of the equipment, and can unload the first deodorizing particles to the correct position by adsorption; further, the deodorant of the first deodorizing particles is not easy to be lost or deteriorated under the coating of the water-soluble film, urine and feces can contact the first deodorizing particles, the water-soluble film dissolves in water, and the deodorant can deodorize, thereby improving the deodorizing effect; the urine trough and feces trough It can not only separate urine and feces, but also store a large number of first deodorizing particles in the urine trough and the feces trough. A large amount of urine and feces will enter the urine trough and the feces trough first, and the first deodorizing particles can fully contact the urine and feces at the first time. The guide groove has a diversion effect to prevent urine from leaking sideways, and the annular groove has a flow blocking effect to prevent feces from flowing out and prevent a large amount of feces and urine from mixing to produce odor. It can also fully deodorize the feces and improve the deodorizing effect; further, part of the liquid enters the core body, and the second deodorizing particles can deodorize the inside of the core body. The second deodorizing particles are granular when not dissolved and will not settle at the bottom of the absorption core layer. They can be arranged at various positions of the core body. At the same time, the deodorant can flow with the liquid and can deodorize various positions of the core body to improve the deodorizing effect; further, since a large amount of liquid is absorbed at the top, the number of the second deodorizing particles gradually decreases from top to bottom, which can save raw materials and improve the utilization rate of the second deodorizing particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a simplified structural diagram of the production device of the present invention.

[0031] Figure 2 It is a simplified structural diagram of the polymer feeding device.

[0032] Figure 3 It is a top view of the polymer feeding device.

[0033] Figure 4 It is a schematic diagram of the structure of the mold box.

[0034] Figure 5 It is a top view of the mold box.

[0035] Figure 6 This is a top view of the template.

[0036] Figure 7 It is a top view of the core body.

[0037] Figure 8 It is a simplified cross-sectional view of the core body.

[0038] Fig. 9 is a cross-sectional view of the first deodorizing particle.

[0039] Fig.10 This is a simplified cross-sectional view of a diaper.

[0040] Fig.11 This is a simplified cross-sectional view of pull-up pants.

[0041] Fig.12 It is another structural diagram of the production device of the present invention.

[0042] Fig.13 It is a simplified cross-sectional view of a core body with a wrapping layer provided thereon.

[0043] Reference numerals:

[0044] 1. Core body; 10. Polymer carrier; 11. Upper core; 111. Urine trough; 112. Feces trough; 113. Ring groove; 12. Lower core; 13. First deodorizing particles; 131. Water-soluble film; 132. Deodorant; 14. Second deodorizing particles; 15. Wrapping layer; 2. Polymer feeding device; 21. Molding bin; 211. Partition; 212. Feed bin; 22. Mold box; 221. First adsorption zone; 222. Second adsorption zone; 223. Third adsorption zone; 224. Fourth Adsorption zone; 23, SAP discharge box; 24, wood pulp discharge box; 25, first particle discharge box; 26, second particle discharge box; 27, template; 270, adsorption hole; 271, forming zone; 31, first negative pressure device; 32, second negative pressure device; 33, third negative pressure device; 34, fourth negative pressure device; 4, driving device; 5, composite wrapping device; 61, first liquid-permeable top layer; 62, first liquid-impermeable bottom layer; 71, elastic waist; 72, second liquid-permeable top layer; 73, second liquid-impermeable bottom layer. DETAILED DESCRIPTION

[0045] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0046] refer to Figures 1 to 9 This embodiment provides a production process for a deodorizing capsule core, comprising the following steps:

[0047] S1. Polymer carrier 10 delivery:

[0048] The driving device 4 transports the core body 1 , thereby driving the polymer carrier 10 to move. The driving device 4 transports the polymer carrier 10 to the polymer unloading device 2 , and the driving device 4 stops running.

[0049] The polymer feeding device 2 includes a molding bin 21, a mold box 22 arranged at the bottom of the molding bin 21, a plurality of partitions 211 are arranged in the molding bin 21, and the partitions 211 divide the feeding bin 212 into a plurality of feeding bins 212. A SAP feeding box 23, a wood pulp feeding box 24, a first particle feeding box 25 and a second particle feeding box 26 are arranged at the top of the molding bin 21; the SAP feeding box 23 contains SAP, the wood pulp feeding box 24 contains wood pulp, and the first particle feeding box 25 contains first deodorizing particles 13. A template 27 is arranged at the top of the mold box 22, and a plurality of molding areas 271 are arranged on the template 27, each molding area 271 corresponds to one of the feeding bins 212, and a plurality of adsorption holes 270 are arranged on the molding area 271. A first adsorption area 221 is arranged in the mold box 22 corresponding to each molding area 271, and a forming The second adsorption zone 222 and the third adsorption zone 223 are sealed, the second adsorption zone 222 is arranged along the length direction, the third adsorption zone 223 is arranged at the rear end of the second adsorption zone 222, the first adsorption zone 221, the second adsorption zone 222 and the third adsorption zone 223 are respectively connected to the first negative pressure device 31, the second negative pressure device 32 and the third negative pressure device 33; all the first adsorption zones 221 are connected to the same first negative pressure device 31, all the second adsorption zones 222 are connected to the same second negative pressure device 32, and all the third adsorption zones 223 are connected to the same third negative pressure device 33; the fourth adsorption zone 224 is arranged in the third adsorption zone 223, the fourth adsorption zone 224 is located in the middle of the third adsorption zone 223, the fourth adsorption zone 224 is connected to the fourth negative pressure device 34, and all the fourth adsorption zones 224 are connected to the same fourth negative pressure device 34.

[0050] S2. Manufacturing the lower core 12:

[0051] The SAP discharge box 23, the wood pulp discharge box 24 and the second particle discharge box 26 discharge SAP, wood pulp and the second deodorizing particles 14, and start the first negative pressure device 31, the second negative pressure device 32, the third negative pressure device 33 and the fourth negative pressure device 34 to adsorb the SAP, wood pulp and the second deodorizing particles 14 on the polymer carrier 10. The discharge of the second deodorizing particles 14 gradually increases, so that the second deodorizing particles 14 at the top are more than the second deodorizing particles 14 at the bottom, forming a lower core 12.

[0052] S3. Manufacturing the upper core 11:

[0053] The SAP discharge box 23, the wood pulp discharge box 24 and the second particle discharge box 26 discharge SAP, wood pulp and the second deodorizing particles 14, start the first negative pressure device 31, close the second negative pressure device 32 and the third negative pressure device 33, and the negative pressure of the first negative pressure device 31 discharges SAP, wood pulp and the second deodorizing particles 14 to the top of the lower core 12 to form an upper core 11. The upper core 11 forms a urine trough 111 at the position of the second adsorption area 222 and a feces trough 112 at the position of the third adsorption area 223.

[0054] Only the fourth negative pressure device 34 is started, and SAP and wood pulp are fed to the middle of the feces liquid tank 112 , so that a downwardly concave annular groove 113 is formed around the feces liquid tank 112 , and a large number of first deodorizing particles 13 can be concentrated and fixed in the annular groove 113 .

[0055] After the annular groove 113 is formed, only the third adsorption zone 223 is activated, the first particle discharge box 25 discharges the first deodorizing particles 13, and the third adsorption zone 223 adsorbs the first deodorizing particles 13 into the annular groove 113. The amount of the first deodorizing particles 13 discharged is equal to or greater than the amount of the first deodorizing particles 13 that can be arranged in the annular groove 113, so that the first deodorizing particles 13 can be fully distributed in the annular groove 113.

[0056] S4. First deodorizing particles 13 are fed:

[0057] The first particle discharge box 25 discharges the first deodorizing particles 13, starts the second negative pressure device 32, the third negative pressure device 33 and the fourth negative pressure device 34, and closes the first negative pressure device 31. The first deodorizing particles 13 can be discharged into the feces tank 112 and the urine tank 111 through the force of adsorption.

[0058] S5. Forming the core body 1:

[0059] The driving device 4 is started to pull out the formed core body 1, and the polymer carrier 10 at the rear end is moved to the polymer unloading device 2 to carry out the next round of process.

[0060] refer to Fig.10 The present invention provides a deodorizing capsule diaper, comprising a first liquid-permeable top layer 61, a core body 1, and a first liquid-impermeable bottom layer 62 arranged from top to bottom.

[0061] refer to Fig.11 The present invention provides a pair of pull-up pants with deodorizing capsules, comprising a core body 1, an elastic waist 71 connected to both ends of the core body 1, a second liquid-permeable top layer 72 on the top of the core body 1, and a second liquid-impermeable bottom layer 73 on the bottom of the core body 1.

[0062] The first deodorizing particle 13 includes a water-soluble film 131 and a deodorizing agent 132 coated in the water-soluble film 131. The first deodorizing particle 13 may also be a particle structure. The first deodorizing particle 13 and the second deodorizing particle 14 generally have the same structure and may be the same or different in size, depending on the specific situation.

[0063] The above-mentioned first deodorizing particles 13 and the above-mentioned second deodorizing particles 14 can also adopt Chinese patent application number: 202110300109.7, the patent name is an antibacterial deodorizing spherical particle and its preparation process, and the antibacterial deodorizing spherical particles provided can also adopt Chinese patent application number: 202210048923.9, the deodorizing granules provided can also adopt other particles that can deodorize harmlessly, usually particles that melt in water, can also be used. Particles that will become a powder structure when subjected to greater extrusion can also be used, and the specific setting depends on the situation.

[0064] The water-soluble film 131 is PVA or other films that can be dissolved in water, which are well-known materials and will not be described in detail here.

[0065] The deodorant 132 is in powder form and is a well-known material, which will not be described in detail here.

[0066] The diameter of the second deodorizing particles 14 is usually set to be less than 2 mm. During production, in order to prevent the second deodorizing particles 14 from being heavy and settling at the bottom, the diameter may also be set to be greater than or equal to 2 mm, depending on the specific situation.

[0067] In one embodiment, the second particle discharge box 26 and the second deodorizing particles 14 may not be provided.

[0068] In one embodiment, the second deodorizing particles 14 can also be uniformly fed and distributed on the core body 1. In this structure, the utilization rate of the second deodorizing particles 14 is relatively low, and the configuration is specific to the situation.

[0069] The number of the above-mentioned lower material bins 212 can be one, two, three or even more, which can be set according to specific circumstances.

[0070] In one embodiment, the second deodorizing particles 14 may not be disposed in the upper core 11 , and may be disposed according to specific circumstances.

[0071] In one embodiment, the fourth adsorption area 224 and the annular groove 113 may not be provided, and may be provided according to specific circumstances.

[0072] During the feeding process, part of the first deodorizing particles 13 may be deviated and fed to the top of the upper core 11 .

[0073] refer to Fig.12 and Fig.13In step S5 of the present invention, the wrapping layer 15 is wrapped by the composite wrapping device 5 to form the core body 1.

[0074] The composite wrapping device 5 wraps the wrapping layer 15 and is a well-known device, which will not be described in detail here.

[0075] The step S2 of the present invention can also be implemented in the following manner: first, the first negative pressure device 31 and the second negative pressure device 32 are started, and the third negative pressure device 33 and the fourth negative pressure device 34 are closed, and SAP, wood pulp, and the second deodorizing particles 14 are fed into the first adsorption area 221 and the second adsorption area 222. During the feeding process, the feeding amount of the second deodorizing particles 14 gradually increases; then, the first negative pressure device 31 and the second negative pressure device 32 are closed, and the third negative pressure device 33 and the fourth negative pressure device 34 are opened to feed SAP, wood pulp, and the second deodorizing particles 14 into the first adsorption area 221 and the second adsorption area 222. p. Wood pulp and the second deodorizing particles 14 are fed into the third adsorption zone 223 and the second adsorption zone 222. During the feeding process, the amount of wood pulp and the second deodorizing particles 14 fed gradually increases, and the amount of SAP fed gradually decreases. In the lower core 12 at the stool liquid groove 112, the amount of wood pulp and the second deodorizing particles 14 gradually increases from top to bottom, and the amount of SAP gradually decreases from top to bottom, making the top of the stool liquid groove 112 more fluffy, thereby increasing the infiltration and diversion speed of the stool liquid and improving the deodorizing effect of the stool liquid.

[0076] The S4 step of the present invention can also be implemented in the following manner: only the second negative pressure device 32 is started, and the first deodorizing particles 13 can be discharged into the urine tank 111; the second negative pressure device 32 is turned off, and only the third negative pressure device 33 and the fourth negative pressure device 34 are started, and the first deodorizing particles 13 are discharged into the feces tank 112. This method prevents the second negative pressure device 32 from interfering with the third negative pressure device 33 and the fourth negative pressure device 34, so that the first deodorizing particles 13 can be discharged accurately.

[0077] The core body 1 of the present invention is not only used for diapers and pull-up pants, but also can be used for sanitary napkins or other disposable sanitary products.

[0078] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A production process for a deodorizing capsule core, characterized in that: Including the following processes: S1. Polymer carrier delivery: The driving device transports the core body, thereby driving the polymer carrier to move, and the driving device transports the polymer carrier to the polymer unloading device, and the driving device stops running; The polymer feeding device comprises a molding bin and a mold box arranged at the bottom of the molding bin, a plurality of partitions are arranged in the molding bin, the partitions divide the feeding bin into a plurality of feeding bins, a SAP feeding box, a wood pulp feeding box and a first particle feeding box are arranged on the top of the molding bin; the SAP feeding box contains SAP, the wood pulp feeding box contains wood pulp, and the first particle feeding box contains first deodorizing particles, a template is arranged on the top of the mold box, a plurality of molding areas are arranged on the template, each molding area corresponds to one of the feeding bins, a plurality of adsorption holes are arranged on the molding area, a first adsorption area is arranged on each molding area in the mold box, a second adsorption area and a third adsorption area are formed to form a closed area in the first adsorption area, the second adsorption area is arranged along the length direction, the third adsorption area is arranged at the rear end of the second adsorption area, the first adsorption area, the second adsorption area and the third adsorption area are respectively connected to the first negative pressure device, the second negative pressure device and the third negative pressure device; all the first adsorption areas are connected to the same first negative pressure device, all the second adsorption areas are connected to the same second negative pressure device, and all the third adsorption areas are connected to the same third negative pressure device; S2. Manufacturing the lower core: The SAP unloading box and the wood pulp unloading box unload the SAP and the wood pulp, and adsorb the SAP and the wood pulp on the polymer carrier to form a lower core body; S3. Manufacturing the upper core: The SAP unloading box and the wood pulp unloading box unload SAP and wood pulp, start the first negative pressure device, close the second negative pressure device and the third negative pressure device, the negative pressure of the first negative pressure device unloads SAP and wood pulp to the top of the lower core body to form an upper core body, the upper core body forms a urine trough at the position of the second adsorption zone, and forms a feces trough at the position of the third adsorption zone; S4. First deodorizing granule feeding: The first particle discharge box discharges the first deodorizing particles, starts the second negative pressure device and the third negative pressure device, and closes the first negative pressure device, so that the first deodorizing particles can be discharged into the feces tank and the urine tank through the adsorption force; S5. Forming the core body: The driving device is started to pull out the formed core body, and the polymer carrier at the rear end is moved to the polymer unloading device for the next round of process.

2. The production process of a deodorizing capsule core according to claim 1, characterized in that: The molding bin is also provided with a second particle discharge box. In step S2, the second particle discharge box discharges the second deodorizing particles, and the second deodorizing particles are mixed into SAP and wood pulp, so that the lower core has the second deodorizing particles.

3. The production process of a deodorizing capsule core according to claim 2, characterized in that: The second deodorizing particles are gradually added, so that the second deodorizing particles at the top are more than those at the bottom.

4. The production process of a deodorizing capsule core according to claim 2, characterized in that: In step S3, the second particle feeding box feeds the second deodorizing particles so that the upper core has the second deodorizing particles.

5. The production process of a deodorizing capsule core according to claim 1, characterized in that: A fourth adsorption zone is provided in the third adsorption zone, and the fourth adsorption zone is located in the middle of the third adsorption zone. The fourth adsorption zone is connected to a fourth negative pressure device. When step S2 ends, only the fourth negative pressure device is started, and SAP and wood pulp are fed to the middle of the fecal liquid tank, so that a downwardly concave annular groove is formed around the fecal liquid tank, and a large number of first deodorizing particles can be concentrated and fixed in the annular groove.

6. The production process of a deodorizing capsule core according to claim 5, characterized in that: After the annular groove is formed, only the third adsorption zone is activated, the first particle discharge box discharges the first deodorizing particles, and the third adsorption zone adsorbs the first deodorizing particles into the annular groove.

7. The production process of a deodorizing capsule core according to claim 5, characterized in that: In both steps S2 and S4, the fourth negative pressure device is started.

8. The production process of a deodorizing capsule core according to claim 1, characterized in that: The first deodorizing particles include a water-soluble film and a deodorizing agent coated in the water-soluble film.

9. A diaper based on the production process of a deodorizing capsule core according to claim 1, characterized in that: The invention comprises a first liquid-permeable top layer, a core body and a first liquid-impermeable bottom layer which are arranged from top to bottom.

10. A pair of pull-on pants based on the production process of a deodorizing capsule core according to claim 1, characterized in that: The invention comprises a core body and an elastic waist connected to two ends of the core body. The top of the core body is provided with a second liquid-permeable top layer, and the bottom of the core body is provided with a second liquid-impermeable bottom layer.

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