An absorbent core, a sanitary napkin containing the same and a production mechanism thereof

Abstract

The present invention discloses an absorbent core, a sanitary napkin containing the same, and a production mechanism thereof. The absorbent core of the present invention comprises a plurality of fiber strips, a plurality of water-absorbing resins are arranged between adjacent fiber strips, and the fiber strips are formed by combing fiber filaments with irregular cross sections and fiber filaments with circular cross sections, and fiber gap channels for liquid penetration are formed between the fiber filaments with irregular cross sections and the fiber filaments with circular cross sections. The sanitary napkin of the present invention comprises an absorbent core. The production mechanism of the present invention comprises a carding machine, a traction device is arranged at the discharge port of the carding machine, an extrusion device for pressing the fiber web folded by the traction device is arranged at one side of the carding machine, and a delivery device for delivering water-absorbing resin with a controllable delivery amount is also arranged between the discharge port of the carding machine and the traction device. The absorbent core of the present invention has good water absorption characteristics, simplifies the processing links, and is convenient for the processing of the absorbent core.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, in particular to an absorbent core, a sanitary napkin containing the absorbent core and a production mechanism thereof. Background Art

[0002] Super absorbent resin SAP not only has strong hydrophilic groups such as hydroxyl and carboxyl, but also has a three-dimensional grid structure with a certain degree of cross-linking, which can carry excellent water absorption and water retention functions. Once expanded into a gel, it is difficult to separate the absorbed water even under pressure. It is non-toxic and harmless and has been widely used in various fields. At present, most sanitary napkins, diapers, etc. on the market contain super absorbent resin SAP, which has met the application needs of consumers in sanitary products.

[0003] However, currently, super absorbent SAP is only available in powder or granular form. Due to technical bottlenecks, it cannot be made into a fiber state that is convenient for manufacturers to use. As a result, the use of powder or granular super absorbent SAP has many production and use disadvantages. After absorbing water, the super absorbent SAP becomes gel-like and is more likely to condense into a mass. There is also a risk of leakage during use. Because of the gravity effect after the super absorbent SAP absorbs water during use, the product performance is that the product appears in clumps, which not only affects the appearance, but also makes it easier to reduce the product's use and consumer experience. In order to reduce the occurrence of this phenomenon, manufacturers began to use paper to prepare SAP composite layers as a whole chip to add to personal hygiene products, such as: composite chips composed of fluff pulp, SAP and paper, composite chips composed of SAP and paper, etc., which have been disclosed in Chinese patents with application numbers 201721711620.1 and 200920003793.7. At present, the structure generally used in sanitary napkins is release paper + hot melt adhesive + PE breathable film + paper SAP composite layer + guide layer non-woven fabric + perforated non-woven fabric. However, the nature of paper itself determines that the paper is easy to break and disperse after absorbing water, and it cannot fundamentally solve the problem of rolling. Summary of the invention

[0004] In order to overcome the above disadvantages, the object of the present invention is to provide an absorbent core, a sanitary napkin containing the same and a production mechanism thereof. The absorbent core of the present invention is excellently compounded with fibers of anisotropic cross-section and circular cross-section that are soft and highly absorbent and have the ability to quickly diffuse and expand liquid, so that the internal void space is larger, and the water-absorbing resin powder or particles can be evenly dispersed within the internal range of the combed fiber strips, and fiber void channels for liquid penetration are formed between the fibers of anisotropic cross-section and the fibers of circular cross-section, so that the absorbent core has a good water absorption effect. The sanitary napkin using the absorbent core also has good water absorption and is not easy to reverse osmosis. By using the novel production mechanism, a feeding device is added at the discharge port of the combing machine, and the powder or particles of the water-absorbing resin are evenly and quantitatively dispersed within the internal range of the combed fiber net, and then uniformly pressed by the added traction device and extrusion device, a cotton belt with a suitable width, good longitudinal strength and suitable transverse strength is made. Not only can the production equipment of sanitary products be simplified, but also the production efficiency can be improved.

[0005] One of the objects of the present invention is to provide an absorbent core, characterized in that it comprises several layers of fiber strips, a plurality of absorbent resins are arranged between adjacent fiber strips, the fiber strips are combed from irregular-section fiber filaments and circular-section fiber filaments, and fiber gap channels for liquid penetration are formed between the irregular-section fiber filaments and the circular-section fiber filaments.

[0006] The absorbent core is made of an excellent compound of soft and highly absorbent fibers with fast liquid diffusion and rapid expansion capabilities, such as irregular cross-section fibers and regular circular cross-section fibers, which makes the internal void space larger. The absorbent resin is in powder or granular form and can be evenly dispersed within the combed fiber strips. Fiber void channels for liquid penetration are formed between the irregular cross-section fibers and the circular cross-section fibers, and the absorbent core has a good water absorption effect.

[0007] Furthermore, the special-shaped cross-section fiber filaments are one or more of trilobal, multilobal, cross-shaped and Y-shaped cross-section fibers, which facilitates the realization of fiber gap channels.

[0008] Furthermore, the ratio of the number of the fiber filaments with irregular cross-sections to the fiber filaments with circular cross-sections is 5:5-1:9, and the optimal ratio is 5:5.

[0009] Furthermore, the fiber strips of several layers are formed into a fiber net by folding and pressing, which is easy to handle.

[0010] The second object of the present invention is to provide a sanitary napkin, characterized in that it includes the absorbent core described in one of the objects of the present invention, and also includes a non-woven fabric arranged above the absorbent core and a PE bottom film and a release paper located successively below the absorbent core, the edges of the non-woven fabric and the PE bottom film are attached to form an extrusion seal, a plurality of air holes are provided on the non-woven fabric, and the PE bottom film and the release paper are bonded together by hot melt adhesive.

[0011] Furthermore, the absorbent core has a thickness of 1 mm to 6 mm, which is of suitable thickness, thin and light, and has good water absorption effect.

[0012] The third object of the present invention is to provide an absorbent core production mechanism for producing the absorbent core of one of the objects of the present invention, characterized in that it includes a carding machine, a traction device is provided at the discharge port of the carding machine, an extrusion device is provided on one side of the carding machine to press the fiber web folded by the traction device, and a feeding device for feeding absorbent resin is also provided between the discharge port of the carding machine and the traction device, and the feeding device includes a hopper fixed above the discharge port of the carding machine and a feeding assembly arranged below the hopper to control the feeding speed.

[0013] A feeding device is added at the discharge port of the carding machine to evenly and quantitatively disperse the powder or particles of the water-absorbing resin in the internal range of the carded fiber web, and then evenly pressed by the added traction device and extrusion device to produce a cotton belt with appropriate width, good longitudinal strength and suitable transverse strength. This can not only simplify the production equipment of sanitary products, but also improve production efficiency.

[0014] Furthermore, the unloading assembly includes a horizontally placed conveying pipe, the top of which is provided with a feed port communicating with a hopper, a discharging screw rod rotatably connected in the conveying pipe, one end of which penetrates the conveying pipe and is fixed with a driving motor for driving the screw rod to rotate, a discharge port is provided on one side of the bottom wall of the conveying pipe, and the discharge port is located directly above the fiber web output from the discharge port of the combing machine. The speed of the water-absorbing resin is controlled by controlling the rotation speed of the driving motor, and the water-absorbing resin is discharged onto the fiber web combed by the combing machine, and the discharge speed of the water-absorbing resin is 5.0 g / min-50 g / min.

[0015] Specifically, the traction device includes two symmetrically arranged traction components, a gap is formed between the two traction components for the fiber web to pass through, the gap is smaller than the width of the fiber web, the traction component includes three rollers arranged in a triangle, a traction belt is provided on the roller outer cover, and one of the rollers rotates under the driving of the driving member. The fiber web combed out by the carding machine passes through the traction device and is folded into several layers of fiber strips.

[0016] Furthermore, the extrusion device includes a first pressing roller and a second pressing roller, the distance between the upper and second pressing rollers is adjustable, and the distance between the upper and second pressing rollers is smaller than the gap. The extrusion device extrude the multi-layer fiber strips into a cotton strip of appropriate width with good longitudinal strength and suitable transverse strength.

[0017] Furthermore, it also includes a material receiving device arranged on the side of the extrusion device away from the carding machine, the material receiving device includes a frame, a placing barrel is arranged in the frame, the placing barrel rotates under the driving of a rotary motor, and a guide wheel for the fiber strips to pass through is arranged on the frame. The produced cotton strips are sequentially wound in the placing barrel, which is convenient for the sanitary napkin manufacturer to operate and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the cross-sectional microscopic state in Example 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the microscopic state of the cross-section of the fiber with a special cross-section in Example 1 of the present invention;

[0020] Figure 3 is a cross-sectional view of Example 2 of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0022] Figure 5 is a top view of embodiment 3 of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the blanking component in Example 3 of the present invention.

[0024] In the figure:

[0025] 1-water-absorbent resin, 2-profiled cross-section fiber filaments, 3-circular cross-section fiber filaments, 41-absorbent core, 42-PE bottom film, 43-release paper, 44-non-woven fabric, 5-combing machine, 6-traction device, 61-roller, 62-traction belt, 7-extrusion device, 8-dispensing device, 81-hopper, 82-discharging component, 821-conveyor pipe, 822-discharging screw rod, 823-driving motor, 824-discharging port, 9-collecting device, 91-frame, 92-placing barrel, 93-rotating motor, 94-guide wheel. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] Embodiment 1

[0028] Embodiment 1

[0029] See attached Figure 1-2 As shown, an absorbent core 41 of the present invention is characterized in that it includes several layers of fiber strips, a plurality of absorbent resins 1 are arranged between adjacent fiber strips, the fiber strips are combed from irregular-section fiber filaments 2 and circular-section fiber filaments 3, and fiber gap channels for liquid penetration are formed between the irregular-section fiber filaments 2 and the circular-section fiber filaments 3.

[0030] The shaped cross-section fiber filaments 2 are one or more of trilobal, multilobal and cross-section fibers, which are convenient for realizing fiber gap channels. The water-absorbing resin 1 is in powder or granular form. The ratio of the shaped cross-section fiber filaments 2 to the circular cross-section fiber filaments 3 is 5:5-1:9, and the optimal ratio is 5:5. Several layers of the fiber strips are formed by folding and pressing a fiber web, which is easy to operate.

[0031] The absorbent core 41 is made of an excellent compound of fibers with irregular cross-sections and regular circular cross-sections that are soft and highly absorbent and have the ability to quickly diffuse and expand liquids, so that the internal void space is larger. The absorbent resin 1 is in powder or granular form and can be evenly dispersed within the internal range of the combed fiber strips. Fiber void channels for liquid penetration are formed between the irregular cross-section fibers 2 and the circular cross-section fibers 3, and the absorbent core 41 has a good water absorption effect.

[0032] Embodiment 2

[0033] See attached Figure 3 As shown, a sanitary napkin is provided, comprising the absorbent core 41 described in the first embodiment, and also comprising a non-woven fabric 44 arranged above the absorbent core 41, and a PE bottom film 42 and a release paper 43 arranged successively below the absorbent core 41, wherein the edges of the non-woven fabric 44 and the PE bottom film 42 are attached to form an extrusion seal, a plurality of air holes are arranged on the non-woven fabric 44, and the PE bottom film 42 and the release paper 43 are bonded together by hot melt adhesive. The absorbent core 41 has a thickness of 1 mm to 6 mm, which is suitable, thin and light, and has a good water absorption effect.

[0034] The absorbent core 41 of the sanitary napkin has fiber gap channels for liquid penetration, and does not require a guide layer, which is convenient for operation and production.

[0035] Embodiment 3

[0036] See attached Figure 4-6As shown, a production mechanism of an absorbent core 41 for producing the absorbent core 41 in Example 1 is provided, including a combing machine 5. The combing machine 5 is a prior art and has been disclosed in the Chinese patent application number CN201420310443.6, which will not be described here. The combing machine 5 is used to comb the irregular cross-section fiber filaments 2 and the circular cross-section fiber filaments 3 into a fiber web, which is uniformly output from the discharge port of the combing machine 5. The discharge port of the combing machine 5 is provided with a traction device 6, which is used to fold the fiber web, and one side of the combing machine 5 is provided with an extrusion device 7 for pressing the fiber web folded by the traction device 6. A delivery device 8 for delivering water-absorbing resin 1 is also provided between the discharge port of the combing machine 5 and the traction device 6. The delivery device 8 includes a hopper 81 fixed above the discharge port of the combing machine 5 and a feeding assembly 82 arranged below the hopper 81 to control the feeding speed. The delivery device 8 evenly delivers the water-absorbing resin 1 to the fiber web combed by the combing machine 5.

[0037] A feeding device 8 is added at the discharge port of the carding machine 5 to evenly and quantitatively disperse the powder or particles of the water-absorbing resin 1 in the internal range of the carded fiber web, and then evenly pressed by the additional traction device 6 and extrusion device 7 to produce a cotton strip with a suitable width, good longitudinal strength and suitable transverse strength. This can not only simplify the production equipment of sanitary products, but also improve production efficiency.

[0038] The unloading assembly 82 includes a horizontally placed conveying pipe 821, which is fixed to the ground by a stand, and is perpendicular to the discharge direction of the combing machine 5. The top of the conveying pipe 821 is provided with a feed port connected to the hopper 81, and a discharging screw rod 822 is rotatably connected in the conveying pipe 821. One end of the discharging screw rod 822 penetrates the conveying pipe 821 and is fixed with a driving motor 823 for driving the rotation thereof. A unloading port 824 is provided on one side of the bottom wall of the conveying pipe 821, and the unloading port 824 is located directly above the fiber web output from the discharge port of the combing machine 5. The delivery speed of the water-absorbing resin 1 is controlled by controlling the rotation speed of the driving motor 823, and the water-absorbing resin 1 is delivered to the fiber web combed by the combing machine 5, and the delivery speed of the water-absorbing resin 1 is 5.0g / min-50g / min. The width of the discharge port matches the width of the fiber web below, and a mesh plate is detachably connected to the discharge port 824 , and the mesh size of the mesh plate can be adjusted accordingly according to the density of the water-absorbing resin 1 .

[0039] The traction device 6 includes two symmetrically arranged traction components, a gap is formed between the two traction components for the fiber web to pass through, the gap is smaller than the width of the fiber web, and the traction component includes three rollers 61 arranged in a triangle, and the rollers 61 are provided with traction belts 62 on their outer surfaces, and one of the rollers 61 rotates under the driving of the driving member. The fiber web combed by the carding machine 5 passes through the traction device 6 and is folded into several layers of fiber strips.

[0040] The extrusion device 7 includes a first pressing roller and a second pressing roller. The distance between the first pressing roller and the second pressing roller is adjustable. The distance between the first pressing roller and the second pressing roller is smaller than the gap. The extrusion device 7 extrude the multi-layer fiber strips into a cotton strip of appropriate width with good longitudinal strength and suitable transverse strength.

[0041] It also includes a receiving device 9 arranged on the side of the extrusion device 7 away from the carding machine 5, and the receiving device 9 includes a frame 91, and a placing barrel 92 is arranged in the frame 91. The placing barrel 92 rotates under the drive of a rotating motor 93, and a guide wheel 94 for the fiber strips to pass through is arranged on the frame 91. The produced cotton tape is wound in the placing barrel 92 in sequence, which is convenient for sanitary napkin manufacturers to operate and use. The production speed of the cotton tape is within the range of 60m-180m / min. It also includes a cutting machine, which cuts the cotton tape into sections when needed, cuts to form an absorbent core 41 that can be used for sanitary napkins, and then processes the sanitary napkins.

[0042] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An absorbent core production mechanism for producing an absorbent core, characterized in that: The absorbent core comprises a plurality of layers of fiber strips, a plurality of water-absorbing resins are arranged between adjacent fiber strips, the fiber strips are formed by combing shaped cross-section fiber filaments and circular cross-section fiber filaments, fiber gap channels for liquid penetration are formed between the shaped cross-section fiber filaments and the circular cross-section fiber filaments, the absorbent core production mechanism comprises a combing machine, a traction device is arranged at the discharge port of the combing machine, an extrusion device for pressing the fiber web folded by the traction device is arranged at one side of the combing machine, a delivery device for delivering water-absorbing resin is also arranged between the discharge port of the combing machine and the traction device, the delivery device comprises a hopper fixed above the discharge port of the combing machine and a feeding assembly arranged below the hopper for controlling the feeding speed; The dispensing device evenly and quantitatively disperses the water-absorbing resin within the internal range of the combed fiber web, and then evenly compresses it through the traction device and the extrusion device.

2. The absorbent core production mechanism according to claim 1, characterized in that: The unloading assembly includes a horizontally placed conveying pipe, a feed port connected to a hopper is arranged on the top of the conveying pipe, a discharging screw rod is rotatably connected inside the conveying pipe, one end of the discharging screw rod passes through the conveying pipe and is fixed with a driving motor for driving the rotation thereof, a unloading port is opened on one side of the bottom wall of the conveying pipe, and the unloading port is located directly above the fiber web output by the carding machine.

3. The absorbent core production mechanism according to claim 1, characterized in that: The traction device includes two symmetrically arranged traction components, a gap is formed between the two traction components for the fiber web to pass through, and the gap is smaller than the width of the fiber web. The traction component includes three rollers arranged in a triangle, and the roller outer shells are provided with traction belts. One of the rollers rotates under the drive of a driving member.

4. The absorbent core production mechanism according to claim 1, characterized in that: It also includes a material receiving device arranged on the side of the extrusion device away from the carding machine. The material receiving device includes a frame, a placement barrel is arranged in the frame, the placement barrel rotates under the drive of a rotating motor, and a guide wheel for the fiber strips to pass through is arranged on the frame.

Images