Absorbing core

Abstract

The utility model provides an absorption core body, which is manufactured by specially designed production equipment and method, and is structurally characterized by comprising a first latex layer, a first SAP layer, a second latex layer, a second SAP layer and a surface layer material which are fused from bottom to top, and the surface layer is made of non-woven fabrics or dust-free paper and the like. In the process of manufacturing products such as liquid sanitary napkins, paper diapers and breast pads, only material rolls with proper widths need to be selected and cut into single sheets with corresponding lengths, and surface layer materials do not need to be glued in the prior art, so that the cost is saved, and the production efficiency is improved; meanwhile, compared with similar absorption core bodies in the prior art, the SAP layers are all SAP particle layers, so that the advantages of high water absorption capacity and anti-overflow capacity of the SAP layers can be exerted to the maximum extent, and hygienic products made of the SAP particle layers are better in absorption capacity, reverse osmosis capacity and anti-overflow capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of sanitary products, and particularly relates to an absorbent core body which is a core component of sanitary products such as sanitary napkins, diapers, breast pads, etc. Background Art

[0002] For daily sanitary products and medical supplies such as sanitary napkins, diapers, breast pads, nursing pads, pet pads, pressure sore dressings, liquid absorbent pads, etc., their core component is an absorbent core body disposed inside the product. The water absorption (blood, urine, milk) performance of the product is directly related to the performance and use comfort of the product. Conventional absorbent cores are mainly produced with wood pulp as the main raw material. For example, the manufacturing method of the water-absorbing material disclosed in the Chinese patent document with the application publication number CN107761436A. With the enhancement of people's environmental protection awareness, using wood pulp as the main raw material to make absorbent cores is not only expensive but also not environmentally friendly enough. In recent years, superabsorbent resin, also known as superabsorbent polymer (English full name: Super Absorbent Polymer, English abbreviation: SAP), as a new type of functional polymer material, with its high water absorption function and excellent water retention performance, has been applied in the manufacture of absorbent cores, especially for absorbent cores used in "liquid sanitary napkins". For example, the preparation method of a liquid sanitary napkin absorbent core disclosed in the Chinese patent document with the application publication number CN 116421766 A. The absorbent core made with SAP as one of the raw materials not only has strong water absorption (blood, urine) ability, but also once it absorbs water and swells into a hydrogel, it makes it difficult to separate the water even when the absorbent core is pressed, effectively improving the performance of traditional sanitary napkins, diapers, and breast pads in preventing the water (blood, urine) absorbed by the absorbent core from being easily spilled under pressure. However, currently, when using SAP as one of the raw materials to make absorbent cores, it is mainly to first mix SAP with other raw materials continuously through a process to have a chemical reaction, and then use subsequent processes to prepare an absorbent core containing SAP. The technical problems it has are as follows: First, it cannot maximize the water absorption performance of SAP; second, there is a lack of an effective production equipment and preparation method for using SAP as one of the important raw materials to make high-cost-effective absorbent cores; third, the structure and performance of the existing absorbent cores still need to be further improved and enhanced. Content of the Utility Model

[0003] The purpose of the utility model is to provide an absorbent core with improved structure that has better absorption capacity, reverse osmosis and anti-overflow capabilities compared to existing similar products, and to disclose the production equipment and method of this new structure absorbent core.

[0004] The technical solution of the utility model is: The absorbent core of the utility model is characterized in that it includes a first latex layer, a first SAP layer, a second latex layer, a second SAP layer, and a surface layer material which are sequentially arranged from bottom to top and integrated into one body.

[0005] A further solution is that both the first SAP layer and the second SAP layer are composed of SAP particles.

[0006] A further solution is that the surface layer material is non-woven fabric or dust-free paper.

[0007] A further solution is that the thickness of the first latex layer is 0.5 to 4 millimeters.

[0008] A further solution is that the thickness of the first latex layer is 0.5 to 4 millimeters.

[0009] The utility model has positive effects: Through the improvement of the structure, in the process of manufacturing products such as liquid sanitary napkins, diapers, and breast pads, only a finished product of appropriate size needs to be selected for production, without the need for an additional process of gluing the surface layer material as in the prior art, saving production costs and improving production efficiency; at the same time, compared with the same type of absorbent core in the prior art, the utility model adopts a five-layer structure integrating a surface layer, two latex layers, and two SAP layers, and the SAP layers are all SAP particle layers, so as to maximize the advantages of the strong water absorption (blood, urine, emulsion) ability and anti-overflow ability of the SAP layer, making the sanitary napkins, diapers, breast pads and other daily sanitary products made of the absorbent core of the utility model more excellent in absorption ability, reverse osmosis and anti-overflow ability than the similar products in the prior art, and the user is more dry and comfortable when wearing. Description of the Drawings

[0010] Figure 1 is a structural schematic diagram of the utility model;

[0011] Figure 2 is a general structural schematic diagram of the production equipment for manufacturing the utility model;

[0012] Figure 3 is Figure 2 a structural schematic diagram of the first and second coating dies in

[0013] Figure 4 is removing Figure 3 the gland in

[0014] Figure 5 is Figure 2 a structural schematic diagram of the first and second SAP feeding devices in

[0015] Figure 6 is Figure 5 a structural schematic diagram of a feeding roller in

[0016] Figure 7 is Figure 5The second structural schematic diagram of the middle feeding roller;

[0017] Figure 8 is Figure 5 The third structural schematic diagram of the middle feeding roller;

[0018] Figure 9 is the schematic flow chart of the method for producing the present utility model.

[0019] The reference numerals in the above-mentioned drawings are as follows:

[0020] Base 1, feeding nozzle 1-1, storage tank 1-2, connecting screw hole 1-3, partition 2, gland 3, mounting ear 4; material box 5, observation window 5-1, discharging roller 6, material taking groove 6-1, material taking sink 6-2, material taking grille 6-3, surface layer feeding device 7, raw material roll 7-1, traction pair of rollers 7-2, guiding roller 7-3; absorbent core 8, first latex layer 8-1, first SAP layer 8-2, second latex layer 8-3, second SAP layer 8-4, surface layer material 8-5. Specific embodiments

[0021] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0022] (Embodiment 1)

[0023] See Figure 1 , the absorbent core 8 of this embodiment includes a first latex layer 8-1, a first SAP layer 8-2, a second latex layer 8-3, a second SAP layer 8-4 and a surface layer material 8-5 which are integrally fused from bottom to top.

[0024] Among them, both the first SAP layer and the second SAP layer are composed of SAP particles.

[0025] The surface layer material is non-woven fabric or materials such as dust-free paper.

[0026] The thicknesses of the first latex layer 8-1 and the second latex layer 8-3 are respectively 0.5 to 4 millimeters.

[0027] During the process of manufacturing products such as liquid sanitary napkins, diapers, and breast pads using the absorbent core 8 of this embodiment, only a material roll with an appropriate width needs to be selected and cut to a corresponding length for production, without the need to glue and set the surface layer material as in the prior art, saving production costs and improving production efficiency. At the same time, compared with the absorbent cores of the same type in the prior art, the absorbent core 8 of this embodiment adopts a five-layer structure integrating a surface layer, two latex layers, and two SAP layers, and the SAP layers are all SAP particle layers, so as to maximize the advantages of the strong water absorption (blood, urine, lotion) ability and anti-overflow ability of the SAP layers, making the sanitary napkins, diapers, breast pads and other daily sanitary products made of the absorbent core 8 of this embodiment more excellent in terms of absorption ability, reverse osmosis resistance, and anti-overflow ability than the similar products in the prior art, and the user feels drier and more comfortable when wearing and using them.

[0028] See Figure 2 , the production equipment for manufacturing the absorbent core of this embodiment includes a conveyor belt that can reciprocate on the production line, a mixer for stirring the prepared latex mixed raw material, a foaming machine for foaming the latex mixed raw material output by the mixer, a first coating die for uniformly coating the foamed latex material output by the foaming machine on the conveyor belt according to a set thickness to form the first latex layer 8-1 of the absorbent core 8, an infrared device for preliminarily hardening the first latex layer 8-1 on the conveyor belt, a first SAP feeding device for uniformly putting SAP particles on the upper end surface of the preliminarily hardened first latex layer 8-1 to form the first SAP layer 8-2 of the absorbent core 8, a first drying tunnel for drying and fusing and connecting the first latex layer 8-1 and the first SAP layer 8-2, a second coating die for uniformly coating the foamed latex material output by the foaming machine on the upper end surface of the first SAP layer 8-2 according to a set thickness to form the second latex layer 8-3 of the absorbent core 8, a second SAP feeding device for uniformly putting SAP particles on the upper end surface of the second latex layer 8-3 to form the second SAP layer 8-4 of the absorbent core 8, a second drying tunnel for drying the two latex layers and SAP layers, a surface layer feeding device for conveying the surface layer material 8-5 of the absorbent core 8 into the second drying tunnel and making the surface layer material 8-5 composite with the upper end surface of the second SAP layer 8-4, a microwave device for thoroughly dehydrating each layer of the absorbent core 8 conveyed by the conveyor belt to obtain an absorbent core blank, and a slitter for slitting and winding the absorbent core blank to obtain a finished absorbent core 8 material roll.

[0029] The aforementioned conveyor belt uses a silicone belt to prevent the first latex layer 8-1 from adhering to the conveyor belt; the foaming machine is provided with a first discharge port and a second discharge port. The conveyor belt, mixer, foaming machine, first drying tunnel, second drying tunnel, microwave device, and slitter are all commercially available components, and their structures and working principles are all mature prior arts, which will not be elaborated here.

[0030] See also Figure 3 and Figure 4 The first coating mold of this embodiment is mainly composed of a base 1, a partition 2, a pressure cover 3 and a mounting ear 4; the base 1 is provided with one or more (four in this embodiment) feed nozzles 1-1 and a storage tank 1-2 connected to the feed nozzle 1-1, and the base 1 is provided with a connecting screw hole 1-3 for connecting with the partition 2 and the pressure cover 3. The partition 2 is arranged between the base 1 and the pressure cover 3, and the pressure cover 3, the partition 2 and the base 1 are fixedly connected by bolts. A slit for coating the foamed latex material on the conveyor belt is provided between the lower side of the partition 2 and the lower side of the storage tank 1-2 of the base 1, and the width of the slit determines the thickness of the first latex layer 8-1 of the absorbent core 8; in this embodiment, the width of the slit is 0.5 to 4 mm. Preferably, the base 1 is integrally or fixedly provided with more than two mounting ears 4, so that the first coating mold can be conveniently fixed and installed on the production line. The structure of the second coating mold is the same as that of the first coating mold. The feed nozzles of the first coating die and the second coating die are respectively connected to the corresponding discharge ports of the foaming machine, and the first coating die and the second coating die are fixed above the conveyor belt in a manner that the length direction of their slits is perpendicular to the advancing direction of the conveyor belt. The coating die designed by the self-designed coating die of this embodiment has a simple structure and low cost, but can accurately control the thickness of the coated latex layer according to the design requirements when used, and does not consume the foamed latex mixed raw materials during the working process, and does not pollute the environment.

[0031] See also Figures 5 to 8 The first SAP delivery device of this embodiment is mainly composed of a material box 5 for containing SAP particles, a discharge roller 6 for grabbing SAP particles from the material box 5 and evenly delivering them to the latex layer, and a driving motor (not shown in the figure) for driving the discharge roller 6 to rotate. A feed port is provided on the upper side of the material box 5, and a discharge port with a structure matching the discharge roller 6 is provided on the lower side of the material box 5. When working, the discharge roller 6 rotates under the drive of the driving motor and grabs SAP particles from the discharge port of the material box 5 and delivers them evenly to the latex layer. As a specific implementation method, the discharge roller 6 can be used as follows: Figures 6 - 8 Any way, that is Figure 6 As shown in FIG. 1 , a plurality of 2 to 6 mm wide material taking grooves 6-1 are evenly arranged along the axial direction on the main body of the material discharging roller 6; or as shown in FIG. Figure 7 As shown in the figure, the main body of the discharge roller 6 is evenly covered with material taking sink holes 6-2 with a diameter of 2 to 6 mm, or as shown in the figure, Figure 8As shown, a material taking grille 6-3 is evenly and densely arranged on the main body of the feeding roller 6. The length and width of each small grid of the material taking grille 6-3 are 2-6 mm. Preferably, a transparent observation window 5-1 for observing the remaining amount of SAP particles in the material box 5 is further provided on the material box 5 of the first SAP feeding device. The second SAP feeding device has the same structure as the first SAP feeding device. The first SAP feeding device and the second SAP feeding device are both fixedly arranged above the conveyor belt in such a way that the axial direction of their feeding roller 6 is perpendicular to the advancing direction of the conveyor belt.

[0032] Still see Figure 2 , the surface layer feeding device 7 includes a raw material roll 7-1 rotatably arranged on the production line, a traction pair of rollers 7-2 arranged on the second drying channel for traction and conveying the surface layer material 8-5 from the raw material roll 7-1 into the second drying channel, and a guiding roller 7-3 rotatably arranged in the second drying channel for guiding the surface layer material 8-5 to move onto the upper end surface of the second SAP layer 8-4 of the absorbent core 8. The traction pair of rollers 7-2 and the guiding roller 7-3 are both arranged above the conveyor belt in such a way that their axial directions are perpendicular to the advancing direction of the conveyor belt. Obviously, the traction pair of rollers 7-2 and the guiding roller 7-3 are both equipped with corresponding power sources such as motors.

[0033] See Figure 1 , Figure 2 and Figure 9 , the production method for producing the absorbent core of this embodiment is implemented using the aforementioned production equipment, and specifically includes the following steps:

[0034] The first step is to place the prepared latex mixed raw material into a blender for stirring and then output the latex mixed raw material to a foaming machine:

[0035] In this step, the formula of the latex mixed raw material is by weight: 70 parts of synthetic latex, 2-4 parts of sulfur, 2-3 parts of accelerator, 2-3 parts of zinc oxide, 0.2-1 part of antioxidant, 0.1-1 part of antibacterial agent, 1-3 parts of foaming aid, and 15-20 parts of calcium carbonate powder. The prepared latex mixed raw material is placed into a blender, and the blender quickly stirs it at a speed of 1600-2400 revolutions per minute for about 8-12 minutes, and then outputs the stirred latex mixed raw material to the foaming machine.

[0036] The second step is that the stirred latex mixed raw material is foamed in the foaming machine to form foamed latex material, and the diameter of the foaming holes of the foamed latex material is 0.07-0.3 mm. The foaming process involved in this step is a mature existing technology and will not be elaborated.

[0037] The third step is that the foaming machine outputs the foamed latex material from its first discharge port to the first coating die, and the first coating die continuously coats the first latex layer 8-1 of the absorbent core 8 on the running conveyor belt according to the set thickness:

[0038] Specifically, the first coating die is connected to the first discharge port of the foaming machine through its respective feed nozzles 1-1. The first discharge port of the foaming machine feeds the foamed latex into the storage tank 1-2 of the first coating die through the respective feed nozzles 1-1 of the first coating die under a certain pressure. Then, the foamed latex continuously coats the first latex layer 8-1 of the absorbent core 8 on the conveyor belt through the slit between the lower side of the partition plate 2 of the first coating die and the lower side of the storage tank 1-2 of the base 1. The width of the slit determines the thickness of the first latex layer 8-1 of the absorbent core 8.

[0039] In the fourth step, the first latex layer 8-1 on the conveyor belt enters the infrared device for preliminary hardening. In this step, the first latex layer 8-1 is irradiated with infrared rays by the infrared device, so that the foamed latex material is preliminarily hardened, the risk of latex foam bursting and collapsing is reduced, and the stability in subsequent production is increased.

[0040] In the fifth step, start the first SAP feeding device to continuously and evenly feed SAP particles on the upper end surface of the preliminarily hardened first latex layer 8-1 in motion to form the first SAP layer 8-2 of the absorbent core 8. In this step, the feeding amount of SAP particles can be correspondingly controlled by controlling the rotation speed of the feeding roller 6 of the first SAP feeding device, that is, the thickness of the first SAP layer 8-2 can be correspondingly controlled. During the operation, the remaining amount of SAP particles in the material box 5 can be conveniently observed through the observation window 5-1 on the material box 5 of the first SAP feeding device.

[0041] In the sixth step, the first drying tunnel dries the continuously input first latex layer 8-1 and the first SAP layer 8-2 on the conveyor belt and fuses and connects the two. The temperature in the first drying tunnel is set to 90-120 °C.

[0042] In the seventh step, the foaming machine outputs the foamed latex material from its second discharge port to the second coating die, and the second coating die continuously coats the second latex layer 8-1 of the absorbent core 8 on the upper end surface of the running first SAP layer 8-2 according to the set thickness. The specific process can refer to the third step.

[0043] In the eighth step, start the second SAP feeding device to continuously and evenly feed SAP particles on the upper end surface of the running second latex layer 8-3 to form the second SAP layer 8-4 of the absorbent core 8. The specific process can refer to the fifth step.

[0044] Step 9: Start the surface layer feeding device to continuously convey the surface layer material 8-5 of the absorbent core 8 into the second drying channel, and make it composite with the upper end surface of the second SAP layer 8-4 among the two latex layers and two SAP layers conveyed into the second drying channel by the conveyor belt. Then, dry it in the second drying channel. In this step, the surface layer material 8-5 can adopt materials such as non-woven fabric and dust-free paper commonly used for the surface layer of the absorbent core in the prior art. The production method of this embodiment directly composites and dries the surface layer material 8-5 together when the latex is not dry, which is significantly different from the prior art. In the prior art, the absorbent core usually does not have a surface layer material. Only in the process of manufacturing products such as liquid sanitary napkins and diapers using the absorbent core, the surface layer material is glued to the surface of the absorbent core by spraying glue. Compared with the prior art, the absorbent core manufactured by the production method of this embodiment does not need to be composite with the surface layer material again during the process of manufacturing products such as sanitary napkins and diapers, thus saving one process, labor and production costs.

[0045] Step 10: The conveyor belt conveys each layer of the absorbent core 8 into the microwave device for thorough dehydration, and then outputs the absorbent core blank. Microwave dehydration is common knowledge and will not be elaborated.

[0046] Step 11: Use a slitter to slit and wind the absorbent core blank continuously conveyed by the conveyor belt to obtain a roll of the finished absorbent core 8.

[0047] The above embodiments are descriptions of the specific implementation manners of the present invention, rather than limitations on the present invention. Those skilled in the relevant technical fields can also make various transformations and changes to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. An absorbent core, characterized in that: It includes a first latex layer, a first SAP layer, a second latex layer, a second SAP layer, and a surface layer material that are sequentially arranged from bottom to top and integrated into one body; Both the first SAP layer and the second SAP layer are composed of SAP particles.

2. The absorbent core according to claim 1, wherein: The surface layer material is non-woven fabric or airlaid paper.

3. The absorbent core according to claim 1, wherein: The thickness of the first latex layer is 0.5 to 4 millimeters.

4. The absorbent core according to claim 1, wherein: The thickness of the second latex layer is 0.5 to 4 millimeters.

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