Neck-hanging cool wet tissue with oil absorption and cooling functions and preparation method thereof

Abstract

The invention provides a neck-hanging cooling wet tissue with oil absorption and cooling functions and a preparation method thereof, and belongs to the technical field of hygienic products, the neck-hanging cooling wet tissue comprises an upper surface layer, a lower surface layer and a middle layer arranged between the upper surface layer and the lower surface layer, the middle layer is used for absorbing and storing cooling liquid, so that the cooling liquid can be slowly volatilized during use, and the cooling effect is improved. The long-time cooling feeling is provided; the upper surface layer and the lower surface layer are used for protecting and fixing the middle layer so as to prevent the middle layer from dispersing or falling off; according to the cool wet tissue, the three-layer composite melt-blown twin-spun fabric base material is adopted, namely, the three-layer structure of surface layer hydrophobic flow guide, middle layer hydrophilic liquid storage and surface layer hydrophobic flow guide is adopted, the middle layer has the good water storage effect, the water locking and reverse osmosis effect is achieved, cool liquid can be slowly released, long-acting moisturizing is achieved, and the cool feeling is provided; the upper surface layer and the lower surface layer have a good flow guiding effect, rapid oil absorption and sweat absorption are achieved, and besides the flow guiding effect, the upper surface layer and the lower surface layer can further firmly fix the middle layer.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, specifically to a neck-hanging cooling wipe with oil-absorbing and cooling functions and its preparation method. Background Technology

[0002] As people become more hygiene-conscious, consumers are increasingly demanding higher functionality and comfort from personal care products. Traditional wet wipes have a single function, providing only basic cleaning. Currently, functional wet wipes, such as cooling wipes, have emerged. These cooling wipes primarily achieve their cooling effect by adding cooling ingredients like mint.

[0003] While existing cooling wipes contain cooling ingredients such as mint, they still have some significant drawbacks:

[0004] 1. Limitations of substrate: Most existing cooling wipes use traditional polyester-viscose spunlace fabric, which has poor liquid absorption and water retention, and the water evaporates quickly, resulting in a short-lived and easily lost cooling sensation, requiring frequent replacement.

[0005] 2. Insufficient cooling effect: In high-temperature environments, it can only cool down temporarily and cannot effectively and continuously absorb sweat and skin oil, resulting in limited cooling effect and a sticky feeling.

[0006] Utility model patent application number 2024202634462 discloses an instant cooling neck wipe for long-distance exercise. This design uses highly breathable plant fiber nonwoven fabric as the base material, allowing for effective air circulation and good water absorption. However, while plant fiber nonwoven fabric has good breathability and absorbency, its water retention is poor. Therefore, this design uses a method of embedding a liquid-storing flat tube in the base material, storing a cooling and antibacterial peppermint oil solution. During exercise, the peppermint oil solution slowly permeates the mask and hollow fiber tube, allowing the solution to drain slowly, thus solving the problem of poor water retention in existing base materials.

[0007] However, this solution still faces several challenges in practical application, hindering its widespread adoption. Firstly, the complex manufacturing process, involving embedding the liquid-retaining tube into the substrate, creating capillary tubes, and injecting liquid into the tubes, results in a relatively high cost and hinders widespread adoption. Secondly, the wipes produced by this solution have a relatively short shelf life. While the capillary design allows for the slow release of peppermint oil solution, factors such as compression, vibration, and natural diffusion during transportation and storage cause further slow release. By the time the wipes are used, most of the peppermint oil solution may have already flowed from the storage tubes into the plant fiber nonwoven fabric, leading to rapid evaporation and significantly shortening the cooling effect. Furthermore, the large amount of peppermint oil residue adhering to the wipe's surface can cause burning or stinging sensations for consumers with sensitive skin, greatly reducing the user experience.

[0008] Furthermore, existing cooling wipes suffer from several drawbacks: they are inconvenient to wear due to their simple structure, failing to conform to the curve of the neck (a key area for heat dissipation), and easily slipping off, affecting the user experience and cooling effect. There is also a conflict between skin feel and function: prioritizing absorbency may sacrifice softness, or vice versa. Therefore, there is an urgent need to develop a cooling wipe that offers strong oil and sweat absorption, long-lasting cooling effect, and an ergonomic design. Summary of the Invention

[0009] This invention provides a neck-hanging cooling wipe with oil-absorbing and cooling functions and its preparation method, in order to solve the technical problems in the prior art.

[0010] To solve the above problems, the present invention provides a neck-hanging cooling wipe with oil-absorbing and cooling functions, which adopts the following technical solution: it includes an upper surface layer, a lower surface layer, and an intermediate layer disposed between the upper surface layer and the lower surface layer.

[0011] The intermediate layer is used to absorb and store the cooling liquid, allowing the cooling liquid to evaporate slowly during use to provide a long-lasting cooling sensation; the upper and lower layers are used to protect and fix the intermediate layer to prevent it from spreading or falling off.

[0012] As a further improvement, the upper surface layer is a hydrophobic polypropylene meltblown fabric with a dense microporous network to provide capillary conduction and high air permeability, and the lower surface layer has the same structure as the upper surface layer.

[0013] As a further improvement, the fiber diameter of the upper surface layer is 1-5 μm, the porosity of the upper surface layer is 75-80%, and the air permeability of the upper surface layer is 220-240 mm / s. The fiber diameter, porosity, and air permeability of the lower surface layer are the same as those of the upper surface layer.

[0014] As a further improvement, the intermediate layer is a hydrophilic softwood pulp fiber layer, which is mixed with meltblown fibers to improve the fixation effect of the hydrophilic softwood pulp fiber layer.

[0015] As a further improvement, the fiber diameter of the intermediate layer is 25-40 μm, and the fiber length of the intermediate layer is 2-5 mm.

[0016] 6. The neck-hanging cooling wipe with oil absorption and cooling function according to any one of claims 1-5, characterized in that: the upper surface layer, the lower surface layer and the middle layer are connected by ultrasonic welding to form a three-dimensional groove embossing, the three-dimensional groove embossing dividing the middle layer into several independent areas to reduce the displacement, scattering or shedding of the middle layer.

[0017] As a further improvement, the exposed portion of the intermediate layer end face is less than 0.5%.

[0018] A method for preparing a neck-hanging cooling wet wipe, used to prepare the above-mentioned neck-hanging cooling wet wipe with oil absorption and cooling functions, includes the following steps:

[0019] S1. Prepare the intermediate layer by embedding hydrophilic softwood pulp fibers into the meltblown fiber network. The hydrophilic softwood pulp fibers are wrapped around the meltblown fiber network to form a three-dimensional entangled structure to fix the hydrophilic softwood pulp fibers.

[0020] S2. Composite the top layer, middle layer and bottom layer;

[0021] S3. Ultrasonic welding: Ultrasonic welding connects the upper, middle and lower layers into one, and forms a three-dimensional groove embossing on the surface of the cooling wipe. The three-dimensional groove embossing divides the middle layer into several independent areas to bind the hydrophilic softwood pulp fibers.

[0022] S4, Immersion liquid.

[0023] As a further improvement, the vibration frequency applied by the ultrasonic welding head is 20-35kHz, the pressure applied by the ultrasonic welding head to the cooling wipes is 0.3-0.5MPa, and the temperature of the cooling wipes at the welding position during ultrasonic welding is 150-200℃.

[0024] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0025] 1. The cooling wipes of the present invention adopt a three-layer composite meltblown twin-spun fabric substrate, namely a three-layer structure of "surface hydrophobic diversion - middle layer hydrophilic liquid storage - surface hydrophobic diversion". The middle layer has a good water storage effect, realizing the effect of water locking and reverse osmosis, and can slowly release the cooling liquid to achieve long-lasting moisturizing and provide a cooling sensation; the upper and lower surface layers have good diversion function, realizing rapid oil and sweat absorption. In addition to the diversion function, the upper and lower surface layers can also firmly fix the middle layer, greatly reducing the problem of lint.

[0026] Both the upper and lower layers are made of hydrophobic polypropylene meltblown fabric with extremely fine fibers that form a dense microporous network. This provides excellent capillary conduction, high breathability, and a low-friction, skin-friendly feel. The highly breathable hydrophobic polypropylene meltblown fabric is the basis for bidirectional exchange; this structure provides physical channels and storage space for sweat absorption and coolant release. The PP (polypropylene) material undergoes hydrophilic modification treatment to further reduce the liquid contact angle, improving moisture wicking speed and comfort.

[0027] The middle layer is a hydrophilic softwood pulp fiber layer. The hydrophilic softwood pulp fibers have a high aspect ratio and an internal cavity structure, giving them rapid liquid absorption and high water retention capacity. The hydrophilic softwood pulp fiber layer also contains a small amount of meltblown fabric. Specifically, the pulp fibers are embedded in the meltblown fiber network, forming a complex three-dimensional entangled structure. The microfibers on the surface of the meltblown fiber network increase friction and create a "claw" interlocking effect, improving the fixation effect.

[0028] 2. The surface of the cooling wipes has a 3D three-dimensional groove embossing. This three-dimensional groove embossing is formed by ultrasonic welding. The three-dimensional groove embossing can not only connect the top layer, middle layer and bottom layer, but also divide the hydrophilic softwood pulp fibers of the middle layer into several independent areas, so that the hydrophilic softwood pulp fibers are fixed in their respective areas, physically binding the hydrophilic softwood pulp fibers and significantly reducing fiber shedding during use.

[0029] 3. During ultrasonic welding, friction generates heat at the weld joint, causing the surface temperature to reach 150-200℃ and melt first. The melt penetrates the intermediate layer under pressure and forms an anchored weld point after cooling.

[0030] This process encapsulates loose, hydrophilic softwood pulp fibers within a hydrophobic polypropylene meltblown fabric melt, achieving physical fixation while avoiding the degradation of air permeability caused by traditional adhesives. Ultrasonic welding technology is employed, using high-frequency vibration (20kHz) and low pressure (0.3MPa) at the weld points to melt only the surface layer of polypropylene meltblown fabric (PP melting point 160-170℃), thus avoiding damage to the hydrophilic softwood pulp fiber structure.

[0031] A micro-melting barrier is formed at the weld points, limiting the lateral diffusion of sweat and guiding its vertical penetration. The middle layer of hydrophilic softwood pulp fibers (melting point >200℃) exhibits high thermal stability, only slightly softening upon heating while maintaining its main structural integrity. The melt-blown material creates microporous channels within the gaps between the pulp fibers, enhancing interlayer bonding and guiding surface water through these microporous channels into the pulp layer, thereby improving sweat absorption efficiency. The weld point distribution density matches the embossed pattern, forming a synergistic network of flow guidance and water retention, allowing sweat to flow along the grooves and be fixed in the pulp area between the weld points.

[0032] 4. The cooling wipes of the present invention are long strips. When using them, they are first folded in half. After folding, the cross-section of the cooling wipes forms a V-shape. With the V-shaped opening facing upwards, they are hung around the neck. The two ends of the cooling wipes are extended to form knotting areas, which facilitates flexible adjustment of tightness and knotting for fixation. They can also be hung directly around the neck.

[0033] When the cooling wipes are folded into a V-shape, they don't completely conform to the skin, creating a hollow tunnel structure. Furthermore, when hung around the neck, they don't completely adhere to the skin, greatly improving breathability and reducing stuffiness. During neck movements, the relative displacement between the wipes and the skin promotes airflow within the hollow tunnel, accelerating the evaporation of moisture from the wipes and sweat from the skin's surface, thus absorbing heat and lowering the temperature. Attached Figure Description

[0034] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0035] Figure 1 This is a schematic diagram of the structure of the neck-hanging cooling wet wipe with oil-absorbing and cooling function of the present invention;

[0036] Figure 2 This is a cross-sectional microscopic diagram of the neck-hanging cooling wet wipe with oil-absorbing and cooling function of the present invention;

[0037] Figure 3 This is a schematic diagram of the sample length in Experiment 2 of the present invention;

[0038] Figure 4 This is a schematic diagram of the sample width in Experiment 2 of the present invention;

[0039] Figure 5 This is a schematic diagram of the sample thickness in Experiment 2 of the present invention;

[0040] Figure 6 This is a schematic diagram of the dry weight of the sample in Experiment 2 of this invention;

[0041] Figure 7 This is a schematic diagram of the wet weight of the sample in Experiment 2 of this invention;

[0042] Figure 8 This is a schematic diagram of the initial temperature of the sample in Experiment 4 of this invention;

[0043] Figure 9 This is a schematic diagram of the temperature of the sample after it was unfolded and shaken in Experiment 4 of this invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Top layer; 2. Middle layer; 3. Bottom layer. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] In existing technologies, while cooling wipes achieve a cooling effect by adding cooling ingredients such as mint, the limitations of the substrate result in poor liquid absorption and retention, rapid water evaporation, and a short-lived, easily diminished cooling sensation. To address this issue, some solutions have emerged on the market, such as embedding a liquid-retaining flat tube containing a mint oil solution, thereby delaying the discharge of the cooling liquid and prolonging the cooling effect provided by the wipes.

[0048] However, current solutions still struggle to fundamentally address the issues of poor water retention and rapid evaporation in cooling wipes. Firstly, the complex manufacturing process, involving embedding the liquid storage tube into the substrate, creating capillary tubes, and injecting liquid into the storage tubes, leads to higher costs and hinders widespread adoption. Secondly, the wipes produced by this solution have a relatively short shelf life. While the capillary tubes allow for slow release of the peppermint oil solution, factors such as compression, vibration, and natural diffusion during transportation and storage cause further slow release. By the time the wipes are used, most of the peppermint oil solution may have already flowed from the storage tube into the plant fiber nonwoven fabric, resulting in rapid evaporation and significantly shortening the cooling effect. Furthermore, the large amount of peppermint oil adhering to the wipe's surface can cause burning or stinging sensations for consumers with sensitive skin, greatly reducing the user experience.

[0049] To address the aforementioned issues, the present invention proposes to design a new substrate that is easy to mass-produce and has good moisturizing effects, and ultimately designed a three-layer composite meltblown twin-spun fabric substrate.

[0050] Structurally, it adopts a three-layer structure: "surface hydrophobic channeling - middle layer hydrophilic liquid storage - surface hydrophobic channeling". The middle layer is made of hydrophilic softwood pulp fiber, which has good water absorption and high water retention capacity, can store a large amount of cooling liquid, and slowly release the cooling liquid, thus providing a long-lasting cooling sensation.

[0051] However, while hydrophilic softwood pulp fibers offer good water retention, they also have significant drawbacks, namely relatively poor bonding stability, making them prone to unraveling and shedding. To address this, we laminated hydrophobic polypropylene meltblown fabric onto both the top and bottom surfaces of the intermediate layer. This provides excellent bonding stability, and the extremely fine fiber diameter of the hydrophobic polypropylene meltblown fabric creates a dense microporous network, offering superior capillary conduction, high breathability, and a low-friction, skin-friendly feel. This results in a substrate with high moisture retention.

[0052] However, the process of cutting large pieces of raw material into smaller pieces to form the finished product of cooling wipes can lead to the hydrophilic softwood pulp fibers at the four ends of the wipes easily falling off and shedding, which can reduce the user experience. If the edges are then sealed, both the time and material costs will increase.

[0053] To address this, we mixed a small amount of polypropylene meltblown fiber into hydrophilic softwood pulp fiber. Specifically, we first made the polypropylene meltblown fiber into a mesh structure, and then embedded the hydrophilic softwood pulp fiber into the polypropylene meltblown fiber network. On the one hand, the mesh polypropylene meltblown fiber surface has a large number of microfibers with a diameter of 0.1-1μm, which can increase friction and reduce the displacement of the hydrophilic softwood pulp fiber. On the other hand, the microfibers can intertwine and combine with the hydrophilic softwood pulp fiber to form "claws" interlocking, which greatly reduces the shedding of fibers.

[0054] In addition, we use ultrasonic welding to create a three-dimensional groove embossing on the surface of the cooling wipes. The three-dimensional groove embossing confines the hydrophilic softwood pulp fibers within small grids (the grids can be regularly formed, irregularly shaped, or patterned, and can be adjusted according to the actual situation), which significantly reduces fiber shedding during use.

[0055] By incorporating a small amount of polypropylene meltblown fiber into hydrophilic softwood pulp fiber and using a three-dimensional groove embossing design, the cooling wipes of this invention exhibit minimal lint shedding during experimental testing, significantly reducing shedding during use and improving the user experience.

[0056] In terms of process, the preparation process of the intermediate layer and the ultrasonic welding process were optimized.

[0057] The preparation process of the intermediate layer: First, a meltblown fiber network is prepared, and then hydrophilic softwood pulp fibers are embedded in the meltblown fiber network, so that the hydrophilic softwood pulp fibers and the microfibers on the meltblown fiber network are intertwined and combined, thereby greatly reducing the shedding of lint.

[0058] Ultrasonic welding process: Ultrasonic welding avoids the damage to breathability caused by traditional adhesives. It employs a high-frequency, low-pressure welding method. Specifically, high-frequency (20-35kHz) vibration is applied to the weld point, causing the surface layer to reach a temperature of 150-200℃ and melt first. The melt then penetrates the intermediate layer under low pressure (0.3-0.5MPa), forming an anchored weld point after cooling. These parameters maintain the integrity of the hydrophilic softwood pulp fibers. The melt-blown material forms microporous channels in the gaps between the pulp fibers, enhancing interlayer bonding and guiding surface water through these microporous channels into the pulp layer, thereby improving sweat absorption efficiency.

[0059] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0060] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0061] Example 1 of the invention: A neck-hanging cooling wipe with oil-absorbing and cooling function and its preparation method.

[0062] like Figures 1-2 As shown, the neck-hanging cooling wipes with oil-absorbing and cooling functions include an upper surface layer 1, a lower surface layer 3, and an intermediate layer 2 disposed between the upper surface layer 1 and the lower surface layer 3.

[0063] The intermediate layer 2 is used to absorb and store the cooling liquid, allowing it to slowly evaporate during use to provide a prolonged cooling sensation. The cooling liquid contains ingredients such as menthol, aloe vera extract, and ethanol, and its release is triggered by temperature sensitivity and concentration differences. In other embodiments, the composition of the cooling liquid can be adjusted according to actual conditions. The upper surface layer 1 and the lower surface layer 3 are used to protect and fix the intermediate layer 2 to prevent it from spreading or falling off.

[0064] In this embodiment, the upper layer 1 is a hydrophobic polypropylene (PP) meltblown fabric with a dense microporous network to provide capillary conduction and high air permeability. The lower layer 3 has the same structure as the upper layer 1. The fiber diameter of the upper layer 1 is 1-5 μm, the porosity is 75-80%, and the air permeability is 220-240 mm / s. The fiber diameter, porosity, and air permeability of the lower layer 3 are the same as those of the upper layer 1. The PP material undergoes hydrophilic modification treatment to further reduce the liquid contact angle, improve moisture wicking speed, and enhance comfort.

[0065] The intermediate layer 2 is a hydrophilic softwood pulp fiber layer. The hydrophilic softwood pulp fibers are distributed in a flat shape. The hydrophilic softwood pulp fiber layer is mixed with meltblown fibers to improve the fixation effect of the hydrophilic softwood pulp fiber layer. The fiber diameter of the intermediate layer 2 is 25-40μm, the fiber length is 2-5mm, and the high aspect ratio and internal cavity structure endow it with rapid liquid absorption and high water retention capacity.

[0066] The upper surface layer 1, lower surface layer 3, and intermediate layer 2 are connected by ultrasonic welding, forming a three-dimensional grooved embossing. Ultrasonic welding avoids the damage to air permeability caused by traditional adhesives. The three-dimensional grooved embossing divides the intermediate layer 2 into several independent areas to reduce displacement, scattering, or shedding of the intermediate layer 2. The exposed portion of the end face of the intermediate layer 2 is less than 0.5%.

[0067] The cooling wipes of this invention are generally green in color. Based on the principles of color psychology, they convey a sense of nature, freshness, health, and calmness, stimulate dopamine secretion, enhance feelings of pleasure and a "cool and stress-relieving" psychological experience, and at the same time convey an image of environmental protection and vitality.

[0068] The cooling wipes of this invention provide a cooling sensation by unfolding and folding them in half. The cross-section of the folded wipes forms a V-shape. With the V-shaped opening facing upwards, the wipes are hung around the neck (or tied around the wrist). The two ends of the wipes are extended to form knotting areas, which facilitates flexible adjustment of tightness and knotting for fixation. They can also be hung directly around the neck.

[0069] When the cooling wipes are folded into a V-shape, they don't completely conform to the skin, creating a hollow tunnel structure. Furthermore, when hung around the neck, they don't completely adhere to the skin, greatly improving breathability and reducing stuffiness. During neck movements, the relative displacement between the wipes and the skin promotes airflow within the hollow tunnel, accelerating the evaporation of moisture from the wipes and sweat from the skin's surface, thus absorbing heat and lowering the temperature.

[0070] When worn around the neck, moisture evaporates quickly on the exposed side (air side), creating a localized low pressure; the side in contact with the skin has a higher liquid concentration. This pressure difference drives the liquid (mainly water) to migrate from the side in contact with the skin to the exposed side through a fibrous capillary network. Meanwhile, the cooling active ingredients (such as menthol-glycerin solution), with their larger molecular weight, migrate more slowly and remain on the side in contact with the skin, continuously acting on it and synergizing with the endothermic effect of moisture evaporation to achieve a lasting cooling sensation.

[0071] This embodiment also provides a method for preparing a neck-hanging cooling wet wipe, used to prepare the above-mentioned neck-hanging cooling wet wipe with oil absorption and cooling function, including the following steps:

[0072] S1. Prepare intermediate layer 2 by embedding hydrophilic softwood pulp fibers into meltblown fiber network. The hydrophilic softwood pulp fibers are wrapped around the meltblown fiber network to form a three-dimensional entangled structure to fix the hydrophilic softwood pulp fibers.

[0073] S2. Composite the upper surface layer 1, the middle layer 2 and the lower surface layer 3;

[0074] S3. Ultrasonic welding: The upper surface layer 1, the middle layer 2 and the lower surface layer 3 are connected into one piece by ultrasonic welding, and a three-dimensional groove embossing is formed on the surface of the cooling wipe. The three-dimensional groove embossing divides the middle layer 2 into several independent areas to bind the hydrophilic softwood pulp fibers.

[0075] S4, Immersion liquid.

[0076] In this embodiment, the ultrasonic welding head applies a vibration frequency of 20kHz, and the ultrasonic welding head applies a pressure of 0.3MPa to the cooling wipes. During ultrasonic welding, the temperature at the welding position of the cooling wipes is maintained at 150-200℃. This ensures the hydrophobic polypropylene meltblown fabric melts while avoiding damage to the structure of the hydrophilic softwood pulp fibers.

[0077] Experimental process

[0078] The following four experiments verify the water absorption and retention, breathability, low lint shedding, and coolness-remaining properties of the present invention.

[0079] Experiment 1: Water Absorption and Water Retention Test

[0080] Objective: To compare the base fabric of this invention (65g / m²) 2 70% wood pulp / 30% PP twin-spun fabric and traditional spunlace fabric (65g / m²) 2 Washable spunlace fabric, 65g / m 2 4. Viscose: 6. Polyester interwoven plain weave spunlace fabric) has good liquid absorption and water retention capabilities.

[0081] Method: Samples with the same weight and initial wet weight were placed in an environment of 40℃ for 2 hours, and the amount of water evaporated was measured.

[0082] result:

[0083] Water absorption rate: The double-spun fabric of this invention is >900%; the washable spunlace fabric is >600%; the 4R:6T spunlace fabric is >700%.

[0084] Evaporation amount at 40℃ / 2h: 16g for twin-spun fabric and 20g for 4R:6T spunlace fabric.

[0085] Conclusion: The substrate (composite meltblown twin-spun fabric) used in this invention has significantly better liquid absorption and water-locking capabilities, ensuring long-lasting cooling (up to 4 hours).

[0086] Experiment 2: Verify the air permeability of the material.

[0087] refer to Figures 3-7 Calculate the porosity P of the meltblown fabric on the surface of the product, measure the dry weight W1, and measure the wet weight W2. W1 is 0.399g and W2 is 5.632g.

[0088]

[0089]

[0090] Objective: To verify the high air permeability of high-porosity meltblown fabric.

[0091] Methods: The dry weight (W1) and wet weight (W2) of the surface PP meltblown fabric were measured, and the porosity (P) was calculated. The air permeability was measured using an air permeability tester.

[0092] Results: The porosity P can reach 80%, forming a dense and uniform microporous channel. The air permeability is as high as 233.42 mm / s.

[0093] Conclusion: The ultra-high porosity (far exceeding that of ordinary nonwoven fabrics by 50%-70%) and microporous structure provide excellent breathability, which can quickly expel moisture and heat, avoid stuffiness, and increase the liquid absorption rate by more than 30%, which is conducive to the penetration and release of cooling agents.

[0094] Experiment 3: Fiber shedding (hair loss) test.

[0095] Calculate the product end face ratio P1, end face area S1, and product surface area S2.

[0096]

[0097] Objective: To verify the effect of composite structure on fixing wood pulp fibers and reducing fiber shedding.

[0098] Method: Calculate the product end-face area ratio (P1 = S1 / S2, where S1 is the end-face area and S2 is the product surface area). Simulate use through friction and shaking, collect shed fibers, and compare the results.

[0099] Results: Due to the very low percentage of wood pulp fibers exposed at the end face (P1≈0.47%), and the fact that these fibers were partially covered by the surface meltblown fibers, the amount of fiber shedding in actual tests was significantly lower than that of traditional wood pulp spunlace fabric.

[0100] Conclusion: The three-dimensional entanglement, microfiber interlocking, and surface embossing design effectively binds the wood pulp fibers, significantly reducing shedding during use.

[0101] Experiment 4: Rapid cooling performance test after high temperature (refer to...) Figures 8-9 .

[0102] Objective: To verify that wet wipes retain excellent active cooling capabilities after high-temperature storage.

[0103] Method: Place the well-packaged wet wipes in an 80℃ oven and heat to approximately 40℃ internally. Immediately after unpacking, measure the initial temperature of the wet wipes (T0). Fully unfold the wet wipes and shake them vigorously several times, monitoring and recording the temperature changes in real time until they stabilize (T1).

[0104] Results: Initial temperature T0 = 45.9℃. After shaking, the temperature rapidly dropped to T1 = 22.4℃, a decrease of nearly 25℃.

[0105] Conclusion: Even when stored in a high-temperature environment, the wet wipes of this invention can achieve rapid and significant active cooling ("instant cooling" effect) by unfolding to increase the surface area, shaking to promote the evaporation and heat absorption of ethanol / menthol, and heat diffusion / convection of highly breathable materials, thus meeting the immediate cooling needs in hot environments.

[0106] While various embodiments of the invention have been shown and described in this specification, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that in the practice of this invention, various modifications, alterations, and alternatives may be made.

[0107] Various alternatives to the embodiments of the invention described herein are employed. The appended claims aim to...

[0108] The scope of protection of this invention is defined, and therefore covers the model within the scope of these claims.

[0109] Block composition, equivalents or alternatives.

Claims

1. A neck-hanging cooling wipe with oil-absorbing and cooling function, characterized in that, It includes an upper surface layer (1), a lower surface layer (3), and an intermediate layer (2) disposed between the upper surface layer (1) and the lower surface layer (3): The intermediate layer (2) is used to absorb and store the cooling liquid, so that the cooling liquid can slowly evaporate during use to provide a long-lasting cooling sensation; the upper surface layer (1) and the lower surface layer (3) are used to protect and fix the intermediate layer (2) to prevent the intermediate layer (2) from spreading or falling off.

2. The neck-hanging cooling wipe with oil-absorbing and cooling function according to claim 1, characterized in that: The upper surface layer (1) is a hydrophobic polypropylene meltblown fabric with a dense microporous network to provide capillary conduction and high air permeability. The lower surface layer (3) has the same structure as the upper surface layer (1).

3. The neck-hanging cooling wipe with oil-absorbing and cooling function according to claim 2, characterized in that: The fiber diameter of the upper layer (1) is 1-5 μm, the porosity of the upper layer (1) is 75-80%, and the air permeability of the upper layer (1) is 220-240 mm / s. The fiber diameter, porosity, and air permeability of the lower layer (3) are the same as those of the upper layer (1).

4. The neck-hanging cooling wipe with oil-absorbing and cooling function according to claim 1, characterized in that: The intermediate layer (2) is a hydrophilic softwood pulp fiber layer, which is mixed with meltblown fiber to improve the fixation effect of the hydrophilic softwood pulp fiber layer.

5. The neck-hanging cooling wipe with oil-absorbing and cooling function according to claim 4, characterized in that: The fiber diameter of the intermediate layer (2) is 25-40 μm, and the fiber length of the intermediate layer (2) is 2-5 mm.

6. The neck-hanging cooling wipes with oil-absorbing and cooling function according to any one of claims 1-5, characterized in that: The upper surface layer (1), lower surface layer (3) and intermediate layer (2) are connected by ultrasonic welding to form a three-dimensional groove embossing. The three-dimensional groove embossing divides the intermediate layer (2) into several independent areas to reduce the displacement, scattering or shedding of the intermediate layer (2).

7. The neck-hanging cooling wipe with oil-absorbing and cooling function according to claim 6, characterized in that: The exposed portion of the end face of the intermediate layer (2) is less than 0.5%.

8. A method for preparing a neck-hanging cooling wet wipe, used to prepare a neck-hanging cooling wet wipe with oil-absorbing and cooling functions as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Prepare the intermediate layer (2): embed hydrophilic softwood pulp fibers into the meltblown fiber network, and wrap the hydrophilic softwood pulp fibers around the meltblown fiber network to form a three-dimensional entangled structure to fix the hydrophilic softwood pulp fibers. S2. Composite the top layer (1), the middle layer (2) and the bottom layer (3); S3. Ultrasonic welding: The upper surface layer (1), the middle layer (2) and the lower surface layer (3) are connected as one unit by ultrasonic welding, and a three-dimensional groove embossing is formed on the surface of the cooling wet wipe. The three-dimensional groove embossing divides the middle layer (2) into several independent areas to bind the hydrophilic softwood pulp fibers. S4, Immersion liquid.

9. The method for preparing the neck-hanging cooling wet wipe according to claim 8, characterized in that: The ultrasonic welding head applies a vibration frequency of 20-35kHz, the ultrasonic welding head applies a pressure of 0.3-0.5MPa to the cooling wipes, and the temperature of the welding position of the cooling wipes during ultrasonic welding is 150-200℃.

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