Bamboo-grain fabric, preparation device, preparation method and sanitary napkin using the same

Abstract

The invention discloses a bamboo-grain-like fabric, a preparation device, a preparation method and a sanitary napkin using the same. The bamboo-grain-like fabric preparation device comprises a chain-net conveyor, an atomizing assembly, a photocatalytic mechanism and two suction mechanisms. The chain-net conveyor is used for conveying hydrophilic cotton spunlace fabric from front to back. The atomizing assembly is arranged above the chain-net conveyor and is used for uniformly spraying atomized finishing agent droplets and TiO2 nanoparticle droplets on the hydrophilic cotton spunlace fabric on the chain-net conveyor in sequence. The suction mechanism located in the front is used for sucking the finishing agent droplets sprayed by the atomizing assembly until the droplets penetrate and adhere to the hydrophilic cotton spunlace fabric. The photocatalytic mechanism is arranged above the chain-net conveyor and behind the atomizing assembly. The photocatalytic mechanism is used for emitting a straight strip-shaped ultraviolet light spot with a wavelength of 300-400nm to the upper end of the hydrophilic cotton spunlace fabric. The structure is simple, and the surface of the prepared bamboo-grain-like fabric is locally hydrophobic, and the dryness is good after water permeation.

Description

Technical Field

[0001] The invention belongs to the technical field of spunlace fabric processing, and in particular relates to a bamboo-grain-like fabric, a preparation device, a preparation method and a sanitary napkin using the same. Background Art

[0002] Sanitary napkins with cotton surface are skin-friendly and comfortable when interacting with the skin, and are deeply loved by consumers. However, under high humidity conditions, liquid cannot penetrate quickly and is easy to seep back, resulting in poor drying performance, which brings a damp, cold, and sticky feeling to the user. The absorbent body of sanitary napkins mainly consists of three parts: the surface layer, the guide layer, and the core. At present, the surface layer of all-cotton sanitary napkins mostly adopts a hydrophobic impregnation finishing process, and the wettability of the inside and outside is the same, and the drying performance is poor. The surface layer needs to improve its performance to meet consumers' higher demands for comfort and dryness of disposable sanitary products.

[0003] In previous research work, methods including electrostatic spraying, laser perforation, spunlace, plasma etching, etc. were used to achieve major breakthroughs in the study of anisotropic water transport of cotton materials, but there are still problems such as poor material comfort, unsatisfactory water conduction effect, and complex preparation process. In addition, patent CN213190611U discloses a bamboo-grain glue-free composite core and sanitary napkins that use printed dots to form a bamboo trunk and bamboo leaf group pattern, but does not utilize the longitudinal texture structure characteristics of bamboo fibers, and does not form a hydrophilic-hydrophobic structure on the surface of the sanitary napkin. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a bamboo-grain-like fabric preparation device which has a simple structure and can perform bamboo-grain-like treatment on the surface of hydrophilic cotton spunlace fabric.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a bamboo-grain fabric preparation device, comprising a chain-net conveyor, an atomizing assembly, a photocatalytic mechanism and two suction mechanisms, wherein the chain-net conveyor is used to convey the hydrophilic cotton spunlace fabric from front to back, the two suction mechanisms are arranged at intervals along the front-to-back direction, the atomizing assembly is arranged above the chain-net conveyor, and is used to uniformly spray the atomized finishing agent droplets and T on the hydrophilic cotton spunlace fabric on the chain-net conveyor in sequence. The invention discloses a method for preparing a hydrophilic cotton spunlace fabric comprising: forming a TiO2 nanoparticle mist droplet, wherein the suction mechanism located in the front is used for sucking the finishing agent mist droplet sprayed by the atomizing assembly until the droplet penetrates and adheres to the hydrophilic cotton spunlace fabric; the photocatalytic mechanism is arranged above the chain mesh conveyor and located behind the atomizing assembly; the photocatalytic mechanism is used for emitting a straight ultraviolet light spot with a wavelength of 300-400nm to the upper end of the hydrophilic cotton spunlace fabric; the ultraviolet light spot irradiates the area where the TiO2 nanoparticles on the hydrophilic cotton spunlace fabric are catalyzed by the ultraviolet light to decompose the finishing agent, and the surface of the hydrophilic cotton spunlace fabric is provided with longitudinally concave straight strip patterns; the suction mechanism located in the rear is used for removing the unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric.

[0006] The beneficial effect of the above technical solution is that by spraying the finishing agent droplets on the hydrophilic cotton spunlace fabric first, part of the finishing agent penetrates into the upper surface of the hydrophilic cotton spunlace fabric through the capillary adsorption of cotton fibers and the negative pressure provided by the suction mechanism located in the front, and penetrates to a certain thickness (because the finishing agent is hydrophobic), so the upper layer of the hydrophilic cotton spunlace fabric is hydrophobic and the lower layer is still hydrophilic, and then T is sprayed on the upper surface of the hydrophilic cotton spunlace fabric. iO2 nanoparticle droplets, and then the photocatalytic mechanism emits evenly distributed straight ultraviolet light spots to the hydrophilic cotton spunlace fabric. At this time, the TiO2 nanoparticles in each ultraviolet light spot irradiation area will react with the finishing agent to decompose the finishing agent in the ultraviolet light spot irradiation area (the area where the finishing agent on the upper layer of the hydrophilic cotton spunlace fabric is decomposed recovers its hydrophilicity, so that the remaining undecomposed area protrudes upward relative to the decomposed area, and the decomposed area is concave downward, thereby forming straight stripes of texture). At this time, the lower layer of the treated hydrophilic cotton spunlace fabric is the hydrophilic area, the position of the upper layer with straight concave texture is the hydrophilic area, and the rest of the upper layer is still hydrophobic.

[0007] The atomization assembly in the above technical solution includes two atomization mechanisms, and the two atomization mechanisms are respectively a first atomization mechanism and a second atomization mechanism, and the atomization nozzle corresponding to the first atomization mechanism is a first atomization nozzle, and the atomization nozzle corresponding to the second atomization mechanism is a second atomization nozzle, the first atomization nozzle and the second atomization nozzle are both suspended above the feeding end of the chain mesh conveyor, and the second atomization nozzle is located behind the first atomization nozzle, the suction mechanism located in the front is arranged below the conveying channel of the chain mesh conveyor and is located directly below the first atomization nozzle, the suction mechanism located in the rear is arranged above the chain mesh conveyor and is located behind the second atomization nozzle, the photocatalytic mechanism is located between the second atomization nozzle and the suction mechanism located in the rear, the first atomization mechanism is used to atomize the finishing agent solution and spray it from the first atomization nozzle, and the second atomization mechanism is used to atomize the TiO2 nanoparticle solution and spray it from the second atomization nozzle.

[0008] The beneficial effect of the above technical solution is that: at this time, the two atomizing mechanisms and the two atomizing nozzles operate independently, the first atomizing mechanism and the first atomizing nozzle jointly complete the spray treatment of the finishing agent solution, and the second atomizing mechanism and the second atomizing nozzle jointly complete the spray treatment of the TiO2 nanoparticle solution, which can also realize the assembly line production of bamboo-grain fabrics.

[0009] In the above technical solution, a plurality of photocatalytic mechanisms are provided, and the plurality of photocatalytic mechanisms are spaced and distributed along the front-to-back direction between the second atomizing nozzle and the suction mechanism located at the rear.

[0010] The beneficial effect of the above technical solution is that at this time, the ultraviolet light spots on the multiple photocatalytic mechanisms are aligned front to back, so that the reaction area of ​​the decomposition finishing agent on the hydrophilic cotton spunlace fabric is fully irradiated to make the decomposition reaction more complete.

[0011] The photocatalytic mechanism described in the above technical scheme includes a catalytic light source and a shading plate. The light-emitting part of the catalytic light source faces downward, and the light emitted by it is ultraviolet light with a wavelength of 300-400nm. The shading plate covers the lower end of the catalytic light source, and the shading plate is evenly distributed with straight light-transmitting holes to form a straight ultraviolet light spot on the upper end of the hydrophilic cotton spunlace fabric.

[0012] The beneficial effect of the above technical solution is that: its structure is simple, that is, the light passing through the light-transmitting holes irradiates the upper surface of the hydrophilic cotton spunlace fabric to form a straight strip of ultraviolet light spots.

[0013] The density of the hydrophilic cotton spunlace fabric in the above technical solution is 20-50g / m 2 .

[0014] The beneficial effect of the above technical solution is that the hydrophilic cotton spunlace fabric is a low-weight fabric, which achieves the purpose of constructing a water-conducting structure on the surface of a thin material, breaking through the limitation that the existing finishing process is difficult to finish thin materials.

[0015] The preparation method of the finishing agent solution in the above technical scheme is to adjust the pH value of deionized water to weak acidity, then add a hydrophobic finishing agent and mix thoroughly, wherein the hydrophobic finishing agent is an aliphatic water-repellent finishing agent that does not contain alkylphenol polyoxyethylene ether compounds, organic halides, and fluorocarbon compounds, and its concentration is 2-20wt%.

[0016] The beneficial effect of the above technical solution is to solve the problem that the existing ultrasonic atomization and mesh atomizer have strict requirements on the concentration of the atomized liquid and the low atomization efficiency. The existing process has the limitation that it cannot use high-concentration solutions for atomization finishing, and when the concentration exceeds a certain range, there is a problem that the efficiency of converting the liquid into aerosol particles is low, and the screen is easily blocked, resulting in poor atomization effect. Although the concentration of the finishing agent solution used in this solution has far exceeded the existing process, it also has limitations, that is, it cannot be too high, otherwise the surface tension of the liquid is low, and then a large amount of gas is quickly introduced, which will form a large amount of foam, affecting the atomization efficiency. In addition, too high a concentration will also cause blockage in the fog outlet channel.

[0017] The TiO2 nanoparticle solution described in the above technical solution is a solution prepared by using anhydrous ethanol as a solvent and adding TiO2 nanoparticles, and its concentration is 2-10wt%.

[0018] The beneficial effects of the above technical solution are: this concentration is easier to be atomized (liquid containing particles is difficult to be atomized), and in addition, this concentration can meet the needs of the decomposition reaction, and can also reduce the difficulty of later absorption of TiO2 nanoparticles.

[0019] A second object of the present invention is to provide a method for preparing a bamboo-grain-like fabric that can easily prepare the bamboo-grain-like fabric.

[0020] In order to achieve the above object, the technical solution of the present invention is as follows: A method for preparing a bamboo-grain-like fabric comprises the following steps:

[0021] Step 1: Take cotton fibers and comb them through a carding machine to obtain a cotton layer, lay multiple cotton layers flat, overlap them, and spunlace them to obtain a spunlace fabric, and perform a de-bleaching process on the composite spunlace fabric to obtain a hydrophilic cotton spunlace fabric;

[0022] Step 2: Atomizing the finishing agent solution and spraying the finishing agent droplets on the hydrophilic cotton spunlace fabric under the action of negative pressure suction;

[0023] Step 3: atomizing the TiO2 nanoparticle solution and spraying the TiO2 nanoparticle droplets on the upper surface of the hydrophilic cotton spunlace fabric treated in step 2;

[0024] Step 4: irradiating the upper surface of the hydrophilic cotton spunlace fabric treated in step 3 with a straight ultraviolet light spot with a wavelength of 300-400 nm to catalyze the TiO2 nanoparticles to decompose the finishing agent and form longitudinally concave straight stripes on the upper surface of the hydrophilic cotton spunlace fabric;

[0025] Step 5: Remove the unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric by negative pressure.

[0026] The beneficial effects of the above technical solution are: the method has simple steps, and the prepared bamboo-grain-like fabric has a low gram weight, and its upper layer is partially hydrophobic, has good directional water-conducting performance, and has good dryness.

[0027] The third object of the present invention is to provide a bamboo-grain-like fabric with good dryness.

[0028] In order to achieve the above object, the technical solution of the present invention is as follows: a bamboo-grain-like fabric is prepared by the preparation method described above.

[0029] The beneficial effects of the above technical solution are: it has good directional water-conducting performance and has good dryness after water permeation.

[0030] A fourth object of the present invention is to provide a sanitary napkin with a surface layer having good dryness.

[0031] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a sanitary napkin, using the bamboo-grain-like fabric as described above as a surface layer.

[0032] The beneficial effects of the above technical solution are: it has good comfort, strong directional water conduction ability, and good dryness after water permeation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a simplified structural diagram of the device for preparing bamboo-grain-like fabrics according to Example 1 of the present invention;

[0034] Figure 2 This is a simplified structural diagram of the photocatalytic mechanism described in Example 1 of the present invention;

[0035] Figure 3 A schematic structural diagram of the atomizing mechanism and the atomizing nozzle in Example 1 of the present invention;

[0036] Figure 4 This is a distribution position diagram of the baking mechanism described in Example 1 of the present invention.

[0037] In the figure: 1 chain mesh conveyor, 2 atomization assembly, 21a first atomization mechanism, 21b second atomization mechanism, 211 liquid storage tank, 212 air blowing mechanism, 213 atomization tank, 2131 liquid inlet, 2132 mist outlet, 2133 air outlet interface, 2134 filter screen, 214 atomization assembly, 2141 liquid retaining groove, 21411 air outlet, 2142 baffle, 2143 conical nozzle, 2144 conical sleeve, 21441 eyelet, 22a first atomization nozzle, 22b second atomization nozzle, 221 outer tank body, 2211 air inlet interface, 2212 mist inlet interface, 222 inner cylinder body, 223 flow equalization network, 3 photocatalytic mechanism, 31 catalytic light source, 32 shading plate, 33 lamp housing, 4 suction mechanism, 5 hydrophilic cotton spunlace fabric, 6 drying mechanism. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] Example 1

[0040] like Figure 1As shown, this embodiment provides a bamboo-grain fabric preparation device, including a chain-net conveyor 1, an atomizing assembly 2, a photocatalytic mechanism 3 and two suction mechanisms 4, wherein the chain-net conveyor 1 is used to convey a hydrophilic cotton spunlace fabric 5 from front to back, and the two suction mechanisms 4 are arranged at intervals along the front-to-back direction, and the atomizing assembly 2 is arranged above the chain-net conveyor 1, and is used to uniformly spray atomized finishing agent droplets and TiO2 nanoparticle droplets on the hydrophilic cotton spunlace fabric 5 on the chain-net conveyor 1 in sequence, and the suction mechanism 4 located in the front is used to suck the finishing agent droplets sprayed by the atomizing assembly 2 until they penetrate and adhere to the hydrophilic cotton spunlace fabric 5. The photocatalytic mechanism 3 is arranged above the chain-net conveyor 1 and behind the atomizing assembly 2. The photocatalytic mechanism 3 is used to emit a straight ultraviolet light spot with a wavelength of 300-400nm to the upper end of the hydrophilic cotton spunlace fabric 5. The ultraviolet light spot irradiates the area where the TiO2 (titanium dioxide) nanoparticles on the hydrophilic cotton spunlace fabric 5 are catalyzed by the ultraviolet rays to decompose the finishing agent, and the surface of the hydrophilic cotton spunlace fabric 5 produces longitudinally concave straight stripes. The suction mechanism 4 located at the rear is used to absorb the unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric 5, so that the TiO2 nanoparticles on the hydrophilic cotton spunlace fabric 5 are removed. First, the finishing agent droplets are sprayed, and through the capillary adsorption of the cotton fibers and the negative pressure provided by the suction mechanism in the front, part of the finishing agent penetrates into the upper surface of the hydrophilic cotton spunlace fabric and penetrates a certain thickness (because the finishing agent is hydrophobic), so the upper layer of the hydrophilic cotton spunlace fabric is hydrophobic at this time, and the lower layer is still hydrophilic, and then TiO2 nanoparticle droplets are sprayed on the upper surface of the hydrophilic cotton spunlace fabric, and then the photocatalytic mechanism emits uniformly distributed straight strips of ultraviolet light spots to the hydrophilic cotton spunlace fabric. At this time, the TiO2 nanoparticles in each ultraviolet light spot irradiation area will react with the finishing agent to decompose the finishing agent in the ultraviolet light spot irradiation area (hydrophilic cotton spunlace surface The area where the finishing agent on the upper layer of the material is decomposed recovers its hydrophilicity, so that the remaining undecomposed area protrudes upward relative to the decomposed area, while the decomposed area is depressed downward, thereby forming straight stripes of texture). At this time, the lower layer of the treated hydrophilic cotton spunlace fabric is the hydrophilic area, and the position of the upper layer with straight stripes of depressed texture is the hydrophilic area, while the remaining area of ​​the upper layer is still hydrophobic. In this embodiment, the finishing agent and TiO2 nanoparticles are sprayed by an atomization process, so that the excellent hydrophobic performance of the material can be achieved by using a small amount of hydrophobic finishing agent, that is, the finishing agent is only attached to the upper surface layer, and the high efficiency of subsequent catalysis is guaranteed at the same time, that is, the catalytic light source in a relatively short time can decompose the finishing agent on the surface layer and restore its hydrophilicity to form bamboo-like texture.

[0041] The photocatalytic mechanism generates ultraviolet rays in the range of 300-400nm, which are used to excite the electrons generated by TiO2 to become excited states, and utilize the generated electrons and holes to participate in redox reactions and decompose the finishing agent.

[0042] The atomizing assembly 2 in the above technical solution includes two atomizing mechanisms, and the two atomizing mechanisms are respectively a first atomizing mechanism 21a and a second atomizing mechanism 21b, and the atomizing nozzle corresponding to the first atomizing mechanism 21a is a first atomizing nozzle 22a, and the atomizing nozzle corresponding to the second atomizing mechanism 21b is a second atomizing nozzle 22b, the first atomizing nozzle 22a and the second atomizing nozzle 22b are both suspended above the feeding end of the chain mesh conveyor 1, and the second atomizing nozzle 22b is located behind the first atomizing nozzle 22a, the suction mechanism 4 located in the front is arranged below the conveying channel of the chain mesh conveyor 1, and is located directly below the first atomizing nozzle 22a, and the suction mechanism 4 located in the rear is arranged It is arranged above the chain-net conveyor and behind the second atomizing nozzle 22b. The photocatalytic mechanism 3 is located between the second atomizing nozzle 22b and the suction mechanism 4 located behind. The first atomizing mechanism 21a is used to atomize the finishing agent solution and spray it out from the first atomizing nozzle 22a. The second atomizing mechanism 21b is used to atomize the TiO2 nanoparticle solution and spray it out from the second atomizing nozzle 22b. At this time, the two atomizing mechanisms and the two atomizing nozzles operate independently. The first atomizing mechanism and the first atomizing nozzle jointly complete the spraying treatment of the finishing agent solution, and the second atomizing mechanism and the second atomizing nozzle jointly complete the spraying treatment of the TiO2 nanoparticle solution. This can also realize the assembly line production of bamboo-grain fabrics.

[0043] In the above technical solution, there are multiple photocatalytic mechanisms 3, and the multiple photocatalytic mechanisms 3 are spaced apart in the front-to-back direction between the second atomizing nozzle 22b and the suction mechanism 4 located at the rear. At this time, the ultraviolet light spots on the multiple photocatalytic mechanisms are aligned front to back, so as to fully irradiate the reaction area of ​​the decomposition finishing agent on the hydrophilic cotton spunlace fabric, so as to make the decomposition reaction more complete.

[0044] like Figure 2As shown, the photocatalytic mechanism 3 in the above technical solution includes a catalytic light source 31 and a light shielding plate 32. The light emitting part of the catalytic light source 31 faces downward, and the light emitted by it is ultraviolet light with a wavelength of 300-400nm. The light shielding plate 32 covers the lower end of the catalytic light source 31, and the light shielding plate 32 is evenly distributed with straight light-transmitting holes to form a straight ultraviolet light spot on the upper end of the hydrophilic all-cotton spunlace fabric 5. Its structure is simple, that is, the light passing through the light-transmitting holes irradiates the upper surface of the hydrophilic all-cotton spunlace fabric 5 to form a straight ultraviolet light spot. The light-transmitting holes on the light shielding plate are all arranged in the front-to-back direction, and are distributed at intervals in the left-to-right direction, and the light shielding holes on the multiple photocatalytic mechanisms 3 are all aligned front-to-back, so that the decomposition reaction time of the ultraviolet irradiation area under ultraviolet catalysis is relatively prolonged. The light-transmitting holes are arranged in the front-to-back direction, and the multiple light-transmitting holes on the light shielding plate are evenly distributed at intervals in the left-to-right direction. The shading plate on the photocatalytic mechanism can be replaced to adjust the size of the light-transmitting hole (the size of the light-transmitting hole on different shading plates is different).

[0045] The density of the hydrophilic cotton spunlace fabric 5 in the above technical solution is 20-50g / m 2 The hydrophilic cotton spunlace fabric is a low-weight fabric.

[0046] The preparation method of the finishing agent solution in the above technical scheme is to adjust the pH value of deionized water to weak acidity, then add a hydrophobic finishing agent and mix thoroughly, wherein the hydrophobic finishing agent is an aliphatic water-repellent finishing agent that does not contain alkylphenol polyoxyethylene ether compounds, organic halides, and fluorocarbon compounds, and its concentration is 2-20wt%. The concentration of the finishing agent solution cannot be too high, otherwise the surface tension of the liquid is low, and then a large amount of gas is quickly introduced, which will form a large amount of foam, affecting the atomization efficiency. In addition, too high a concentration will also cause the defogger channel to be blocked.

[0047] The TiO2 nanoparticle solution described in the above technical scheme is a solution prepared by using anhydrous ethanol as solvent and adding TiO2 nanoparticles, and its concentration is 2-10wt%. This concentration is easier to atomize (liquids containing particles are more difficult to atomize). In addition, this concentration can meet the needs of the decomposition reaction and can also reduce the difficulty of later absorbing TiO2 nanoparticles.

[0048] like Figure 3As shown, the atomizing mechanism includes a liquid storage tank 211, a blast mechanism 212, an atomizing tank 213 and an atomizing assembly 214. A liquid inlet 2131 and a mist outlet 2132 are provided on the side wall of the atomizing tank 213. An air outlet interface 2133 is provided at the top of the atomizing tank 213. A filter screen 2134 for filtering liquid droplets and mist droplets is embedded in the air outlet interface 2133. The atomizing assembly 214 includes a liquid retaining groove 2141, a baffle 2142, a conical nozzle 2143 and a conical sleeve 2144, the notch of the liquid retaining groove 2141 faces downward, and an air outlet hole 21411 is provided in the middle of the bottom wall thereof, and the air outlet interface 2133 is located at one end of the atomizing tank 213 and extends to the middle of the upper end of the liquid retaining groove 2141 to connect, and the air outlet hole 21411 is connected to the air outlet interface 2133, and the baffle 2142 is horizontally arranged in the liquid retaining groove 2141 and located below the air outlet hole 21411, and the conical sleeve 2144 is provided with a conical sleeve 2144, and the notch of the liquid retaining groove 2141 faces downward, and an air outlet hole 21411 is provided in the middle of the bottom wall thereof, and the air outlet interface 2133 is located at one end of the atomizing tank 213 and extends to the middle of the upper end of the liquid retaining groove 2141 to connect, and the air outlet hole 21411 is connected to the air outlet interface 2133. The conical tip of the conical nozzle 2143 faces upward and is located directly below the baffle 2142, and there is a gap between its upper end and the lower part of the baffle 2142 (the baffle is suspended between the air outlet and the atomizing mechanism, and the preferred baffle can be connected to the liquid retaining groove through a connecting rod), the lower end of the conical nozzle 2143 extends downward to seal and pass through the outside of the atomizing tank 213 to form an air inlet, and the air inlet is connected to the air outlet of the blowing mechanism 212 (which can be a fan). The conical tip of the conical sleeve 2144 faces upward and is sleeved on the upper end of the conical nozzle 2143. At this time, there is a first annular gap between the conical nozzle 2143 and the conical sleeve 2144. The lower end of the conical sleeve 2144 extends downward to be connected to the lower end of the atomizing tank 213, and the lower end of the conical sleeve 2144 has a hole 21441 passing through it, and the hole is used to allow the liquid in the atomizing tank 213 to enter the first annular gap. Among them, the atomization principle of the atomization mechanism is: the conical nozzle sprays high-speed airflow upward, so that the upper end of the first annular gap is under negative pressure, so that the liquid in the atomization tank enters the first annular gap through the hole, and under the negative pressure attraction at the upper end of the first annular gap, the liquid in the first annular gap is sprayed upward until it hits the baffle to form droplets, and the droplets (unatomized droplets) entrained in the droplets are intercepted by the liquid retaining groove and the filter screen and fall back into the atomization tank, the airflow in the atomization tank is discharged through the air outlet interface, and the droplets formed in the atomization tank are discharged through the mist outlet.

[0049] The atomization mechanism has two atomization tanks 213 and two atomization assemblies 214. The two atomization tanks 213 correspond to the two atomization assemblies 214 one by one, and the mist outlet 2132 of one of the atomization tanks 213 is connected to the other atomization tank 213, and the mist outlet 2132 of the other atomization tank 213 constitutes the mist outlet of the entire atomization mechanism.

[0050] The atomizing nozzle comprises an outer tank body 221, an inner cylinder body 222 and a plurality of flow-balancing nets 223 (the number of the flow-balancing nets can be 2-3), the notch of the outer tank body 221 faces downward, the inner cylinder body 222 is vertically arranged in the middle of the outer tank body 221, and the upper end of the inner cylinder body 222 extends upward to be connected with the inner top of the outer tank body 221, a second annular gap is provided between the inner cylinder body 222 and the inner side wall of the outer tank body 221, an air inlet interface 2211 communicating with the second annular gap is provided at the upper end of the outer tank body 221, and a mist inlet interface 2212 communicating with the inner cylinder body 222 is also provided at the upper end of the outer tank body 221, and the mist inlet The interface 2212 is connected to the mist outlet of the atomization mechanism, the air inlet interface 2211 is connected to the air outlet interfaces 2133 of the two atomization tanks 213, and a flow regulating valve 23 is provided at the air inlet interface 2211. The lower ends of the inner cylinder 222 and the outer tank body 221 are both closed, and the closed end of the outer tank body 221 is sleeved outside the closed end of the inner cylinder 222, and the closed end of the outer tank body 221 and the closed end of the inner cylinder 222 have an annular gap to eject airflow, and the closed end of the inner cylinder 222 ejects droplets under the action of the airflow, and a plurality of the flow equalizing nets 223 are horizontally arranged in the inner cylinder and distributed at vertical intervals in the inner cylinder.

[0051] Among them, the droplets generated by the atomizing mechanism enter the inner cylinder of the atomizing nozzle, and the airflow discharged by the atomizing mechanism enters the second annular gap. At this time, a high-speed airflow is sprayed out from the lower end of the second annular gap, so that the lower end of the inner cylinder is under negative pressure. At this time, the droplets in the inner cylinder are sprayed downward under the action of negative pressure (at the same time, the droplets in the atomizing tank are continuously sucked into the inner cylinder), and the flow-evening net evens out the droplets in the inner cylinder in the inner cylinder.

[0052] The liquid storage tank of the first atomizing mechanism contains a finishing agent solution, and the liquid storage tank of the second atomizing mechanism contains a TiO2 nanoparticle solution.

[0053] The lower end of the liquid storage box may be provided with a liquid outlet communicated with the interior thereof, and the liquid outlet is used to communicate with the corresponding liquid inlet, and a valve is provided at the liquid outlet.

[0054] The bamboo-grain fabric prepared in this embodiment is light, thin and comfortable (low weight), and its upper layer is partially hydrophobic (the hydrophobic area of ​​the upper layer is evenly distributed), so it has excellent directional water-conducting performance (so it has good dryness after water permeation), which can fully meet the requirements of disposable sanitary products for the surface layer material. First, compared with the pure cotton material, by constructing a hydrophilic-hydrophobic structure on the surface of the material, the existing pure cotton spunlace nonwoven fabric has the same wettability inside and outside, and is unable to quickly drain the liquid under high humidity conditions and is easy to reflux. Therefore, this type of bamboo-grain fabric will not cause the user to feel damp, cold and sticky discomfort.

[0055] In addition, the atomizing mechanism and atomizing nozzle provided in this embodiment have high atomizing efficiency, large mist output, simple process and easy adjustment, which breaks through the limitations of existing processes on liquid concentration and inability to be used for finishing of thin and light materials. First, compared with the existing airflow compression atomizing equipment, the present invention solves the problem that the existing airflow compression atomizing equipment cannot spray vertically downward through the cooperation of the atomizing mechanism and the atomizing nozzle, and at the same time solves the problem that the momentum of the droplets after atomization is too high, and it is easy to rebound and penetrate the material, resulting in low finishing agent load and large loss. By utilizing the principle of air compression atomization, the purpose of constructing a water-conducting structure on the surface of thin and light materials is achieved, breaking through the limitation that it cannot be used for finishing of thin and light materials.

[0056] Secondly, the present invention breaks through the limitation that the existing atomization process cannot use high-concentration solutions for atomization finishing. The existing ultrasonic atomization and mesh atomizer have strict requirements on the concentration of the atomized liquid, and the atomization efficiency is low. When the finishing agent exceeds 3wt% concentration, there is a problem that the efficiency of converting the liquid into aerosol particles is low and the screen is easily blocked, resulting in poor atomization effect and seriously affecting the finishing process. The atomization mechanism and atomization nozzle provided in this embodiment have high atomization efficiency, large atomization volume, simple process and easy adjustment. The atomization mechanism of this embodiment can adjust the air supply pressure of the air blowing mechanism, and control the atomization amount and load by adjusting the opening of the flow control valve. The existing ultrasonic atomization is that the high-frequency current generated by the ultrasonic generator is converted into sound waves of the same frequency through the ultrasonic transducer, and the sound waves are generated and then act on the liquid surface to convert the liquid into aerosol particles. It is difficult to design multiple energy conversions and adjust the process, and long-term exposure to high-frequency sound waves will cause human body damage.

[0057] The suction mechanism can be a suction plate, which is hollow inside and has suction holes connected to the interior evenly distributed on one side. The other side or all around the suction plate are provided with suction ports connected to the interior. The suction ports are used to communicate with a negative pressure device (such as a negative pressure pump). The suction holes on the front suction plate face upward, while the suction holes on the other suction plate face downward.

[0058] like Figure 4 As shown, in order to improve the finishing effect of the finishing agent, a drying mechanism suspended above the chain mesh conveyor can be further provided between the first atomizing nozzle and the second atomizing nozzle. The drying mechanism is used to dry the hydrophilic cotton spunlace fabric after the finishing agent is sprayed on the surface of the hydrophilic cotton spunlace fabric. This can improve the adhesion effect of the finishing agent on the hydrophilic cotton spunlace fabric. The drying mechanism and the chain mesh conveyor are similar to the existing fabric drying tunnel (which belongs to the prior art and will not be described here).

[0059] Embodiment 2:

[0060] This embodiment provides a method for preparing a cotton surface layer with bamboo fiber-like strip patterns, comprising the following steps:

[0061] Raw material selection specification: the weight is 30g / m 2 The plain cotton spunlace nonwoven fabric is laid flat on the conveying channel of the chain mesh conveyor;

[0062] Preparation of finishing agent: adjust 1L of deionized water to pH 5, add 30g of fluorine-free hydrophobic finishing agent DuPont fluorine-free waterproofing agent Zelan R3, mix thoroughly under 60kHz ultrasonic vibration for 10min, and then use for atomization finishing;

[0063] Specific process of atomization finishing: The standard air volume of the suction mechanism located in the front is set to 1680m 3 / h, the finishing agent concentration is 3wt%, the air source pressure is 1.5 MPa (the air pressure at the air outlet of the blowing mechanism), and the conveyor belt speed is 50m / min; the finishing agent is attached to the plain cotton spunlace non-woven fabric layer through an atomization finishing process, and the specific process operation method refers to the preparation method provided by the present invention, and then drying is performed to finally obtain a directional water-conducting cotton spunlace surface layer material;

[0064] Photocatalytic process: a 5wt% TiO2 nanoparticle solution was prepared with anhydrous ethanol, and the treated material was subjected to secondary atomization treatment, and then dried; the dried material entered the selective photocatalytic process, and the photocatalytic light source used a xenon lamp (emitting ultraviolet light with a wavelength of 300-400nm), with a power of 400W, an ultraviolet intensity of 100mW, and an optical density of 150mW / cm 2 The width of the light-transmitting hole on the shading plate is 1.5 mm, the interval between two adjacent light-transmitting holes is 5 mm, multiple catalytic devices work simultaneously, and the photocatalytic time is 10 seconds. The material after photocatalytic finishing also needs to be sucked by the suction mechanism located at the rear to remove the unreacted TiO2 nanoparticles, and finally a cotton surface layer with bamboo fiber-like strip patterns on the surface is obtained.

[0065] Embodiment 3:

[0066] The basic content is the same as that of Application Example 2, except that the width of the light-transmitting holes on the shading plate is 3 mm, and the interval between two adjacent light-transmitting holes is 5 mm.

[0067] Embodiment 4:

[0068] The basic content is the same as that of Application Example 2, except that: multiple catalytic devices work simultaneously, and the photocatalytic time is 20 seconds.

[0069] Embodiment 5:

[0070] The basic content is the same as that of Application Example 3, except that the width of the light-transmitting holes on the shading plate is 3 mm, and the interval between two adjacent light-transmitting holes is 6 mm.

[0071] The cotton surface layer with bamboo fiber strip pattern prepared in Examples 2-5 was compared with the surface layers of two common sanitary napkin products of Pure Cotton Times (Shenzhen Pure Cotton Times Technology Co., Ltd.) on the market, and the test results are shown in Table 1. It can be seen that the cotton surface layer with bamboo fiber strip pattern provided in Examples 2-4 is basically the same as the surface layer of Comparative Example 1 in 1st penetration time, but the moisture reversal is low; compared with Comparative Example 2, the absorption speed is fast. The cotton surface layer with bamboo fiber strip pattern has the characteristics of fast absorption, low moisture reversal, and dryness.

[0072] Table 1 is the performance comparison results of each embodiment and comparative example

[0073]

[0074] Example 6

[0075] This embodiment provides a method for preparing a bamboo-grain-like fabric, comprising the following steps:

[0076] Step 1: cotton fibers are combed by a carding machine to obtain a cotton layer, multiple cotton layers are laid flat and stacked and spunlaced to obtain a spunlaced fabric, and the composite spunlaced fabric is subjected to a de-bleaching process to obtain a hydrophilic cotton spunlaced fabric 5;

[0077] Step 2: Atomizing the finishing agent solution and spraying the finishing agent droplets on the hydrophilic cotton spunlace fabric 5 under the action of negative pressure suction;

[0078] Step 3: atomizing the TiO2 nanoparticle solution and spraying the TiO2 nanoparticle droplets on the upper surface of the hydrophilic cotton spunlace fabric 5 treated in step 2;

[0079] Step 4: irradiating the upper surface of the hydrophilic cotton spunlace fabric 5 treated in step 3 with a straight strip of ultraviolet light with a wavelength of 300-400 nm to catalyze the TiO2 nanoparticles to decompose the finishing agent and form longitudinally concave straight stripes on the upper surface of the hydrophilic cotton spunlace fabric 5;

[0080] Step 5: Use negative pressure to remove unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric 5; this method has simple steps, and the prepared bamboo-grain fabric has a low gram weight, and its upper layer is partially hydrophobic, has good directional water-conducting performance, and has good dryness.

[0081] Steps 2 to 4 can be processed using the bamboo-grain-like fabric preparation device described in Example 1.

[0082] Example 7

[0083] This embodiment provides a bamboo-grain-like fabric, which is prepared by the preparation method described in Example 2, and has good directional water-conducting performance and good dryness after water permeation.

[0084] Example 8

[0085] The present embodiment provides a sanitary napkin, which uses the bamboo-grain-like fabric as described above as a surface layer. The surface layer of the sanitary napkin provided by the present embodiment forms hydrophobic longitudinal textures, making the sanitary napkin comfortable, dry, non-sticky, and having excellent directional drainage effect.

[0086] The upper end of the surface layer of the sanitary napkin forms concave and convex stripes, and the stripes that are concave downward are hydrophilic, while the stripes that protrude upward are hydrophobic. At this time, the stripes that protrude upward have good skin affinity and good dryness, while the stripes that are concave downward have good moisture absorption effect and can quickly guide water downward. When the sanitary napkin is in use, due to lateral compression, the concave stripes will form wrinkles downward, thereby further preventing the hydrophilic area on the upper end of the surface layer from contacting the skin (so that the upper end of the surface layer contacts the skin more with the hydrophobic area, which makes it drier, and the hydrophilic area on the upper end of the surface layer will further concave downward, so that the liquid will gather more quickly in the concave area and quickly penetrate downward to be absorbed by the core of the sanitary napkin.

[0087] It should be noted that the above detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0088] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0089] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0090] Also, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0091] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0092] For ease of description, spatially relative terms such as "on", "above", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figures. It should be understood that the spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures.

[0093] For example, if a device in a drawing is inverted, a device described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can encompass both "above" and "below." The device may also be oriented in other different ways (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0094] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A bamboo-grain fabric preparation device, characterized in that: The invention comprises a chain mesh conveyor (1), an atomizing assembly (2), a photocatalytic mechanism (3) and two suction mechanisms (4); the chain mesh conveyor (1) is used to convey a hydrophilic cotton spunlace fabric (5) from front to back; the two suction mechanisms (4) are arranged at intervals in the front-to-back direction; the atomizing assembly (2) is arranged above the chain mesh conveyor (1) and is used to uniformly spray atomized finishing agent droplets and TiO2 nanoparticle droplets onto the hydrophilic cotton spunlace fabric (5) on the chain mesh conveyor (1) in sequence; the suction mechanism (4) located in the front is used to suck the finishing agent droplets sprayed by the atomizing assembly (2) until they penetrate a certain thickness and adhere to the hydrophilic cotton spunlace fabric (5). On the spunlace fabric (5), the photocatalytic mechanism (3) is arranged above the chain mesh conveyor (1) and located behind the atomizing assembly (2). The photocatalytic mechanism (3) is used to emit a straight strip of ultraviolet light spots with a wavelength of 300-400nm to the upper end of the hydrophilic cotton spunlace fabric (5). The ultraviolet light spots irradiate the area where the TiO2 nanoparticles on the hydrophilic cotton spunlace fabric (5) are catalyzed by the ultraviolet rays to decompose the finishing agent, and the surface of the hydrophilic cotton spunlace fabric (5) produces vertically concave straight strip patterns. The suction mechanism (4) located at the rear is used to absorb the unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric (5). The atomizing assembly (2) comprises two atomizing mechanisms and two atomizing nozzles, and the two atomizing mechanisms and the two atomizing nozzles correspond to each other one by one, and the two atomizing mechanisms are respectively a first atomizing mechanism (21a) and a second atomizing mechanism (21b), and the atomizing nozzle corresponding to the first atomizing mechanism (21a) is a first atomizing nozzle (22a), and the atomizing nozzle corresponding to the second atomizing mechanism (21b) is a second atomizing nozzle (22b), the first atomizing nozzle (22a) and the second atomizing nozzle (22b) are both suspended above the feeding end of the chain mesh conveyor (1), and the second atomizing nozzle (22b) is located behind the first atomizing nozzle (22a). The suction mechanism (4) at the front is arranged below the conveying channel of the chain mesh conveyor (1) and is located directly below the first atomizing nozzle (22a); the suction mechanism (4) at the rear is arranged above the chain mesh conveyor and is located behind the second atomizing nozzle (22b); the photocatalytic mechanism (3) is located between the second atomizing nozzle (22b) and the suction mechanism (4) at the rear; the first atomizing mechanism (21a) is used to atomize the finishing agent solution and spray it out from the first atomizing nozzle (22a); the second atomizing mechanism (21b) is used to atomize the TiO2 nanoparticle solution and spray it out from the second atomizing nozzle (22b); The finishing agent in the finishing agent solution is a hydrophobic finishing agent; the photocatalytic mechanism (3) comprises a catalytic light source (31) and a shading plate (32); the light emitting portion of the catalytic light source (31) faces downward; the shading plate (32) covers the lower end of the catalytic light source (31); and the shading plate (32) is evenly distributed with straight light-transmitting holes to form a straight ultraviolet light spot on the upper end of the hydrophilic all-cotton spunlace fabric (5); the light-transmitting holes on the shading plate are all arranged in the front-to-back direction and are spaced apart in the left-to-right direction; the density of the hydrophilic all-cotton spunlace fabric (5) is 20-50 g / m 2 .

2. The bamboo-grain-like fabric preparation device according to claim 1, characterized in that: A plurality of the photocatalytic mechanisms (3) are provided, and the plurality of the photocatalytic mechanisms (3) are spaced and distributed along the front-to-back direction between the second atomizing nozzle (22b) and the suction mechanism (4) located at the rear.

3. The bamboo-grain-like fabric preparation device according to claim 1 or 2, characterized in that: The preparation method of the finishing agent solution is to adjust the pH value of deionized water to weak acidity, then add a hydrophobic finishing agent and mix thoroughly, wherein the hydrophobic finishing agent is an aliphatic water-repellent finishing agent that does not contain alkylphenol polyoxyethylene ether compounds, organic halides or fluorocarbon compounds, and its concentration is 2-20wt%.

4. The bamboo-grain-like fabric preparation device according to claim 1, characterized in that: The TiO2 nanoparticle solution is a solution prepared by using anhydrous ethanol as a solvent and adding TiO2 nanoparticles, and the concentration thereof is 2-10wt%.

5. A method for preparing a bamboo-grain-like fabric, characterized in that: The processing is performed using the bamboo-grain-like fabric preparation device as described in any one of claims 1 to 4, specifically comprising the following steps: Step 1: Take cotton fibers and comb them through a carding machine to obtain a cotton layer, lay multiple cotton layers flat, overlap them, and hydroentangle them to obtain a spunlace fabric, and perform a de-bleaching process on the composite spunlace fabric to obtain a hydrophilic cotton spunlace fabric (5); Step 2: atomizing the finishing agent solution and spraying the finishing agent droplets onto the hydrophilic cotton spunlace fabric (5) under the action of negative pressure suction; Step 3: atomizing the TiO2 nanoparticle solution and spraying the TiO2 nanoparticle droplets on the upper surface of the hydrophilic cotton spunlace fabric (5) treated in step 2; Step 4: irradiating the upper surface of the hydrophilic cotton spunlace fabric (5) treated in step 3 with a straight strip of ultraviolet light with a wavelength of 300-400 nm to catalyze the TiO2 nanoparticles to decompose the finishing agent and form longitudinally concave straight strip patterns on the upper surface of the hydrophilic cotton spunlace fabric (5); Step 5: Using negative pressure to remove the unreacted TiO2 nanoparticles on the hydrophilic cotton spunlace fabric (5), the lower layer of the treated hydrophilic cotton spunlace fabric is a hydrophilic area, the upper layer with straight stripe-shaped concave lines is a hydrophilic area, and the rest of the upper layer is still hydrophobic.

6. A bamboo-grain fabric, characterized in that: Prepared by the preparation method described in claim 5.

7. A sanitary napkin, characterized in that: The bamboo-grain-like fabric as claimed in claim 6 is used as the surface layer.

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