Dust mite-proof pillowcase and method of making the same

Abstract

The present application relates to a kind of dust mite pillow cover, including physical protection layer, the inner wall of the physical protection layer is fixedly connected with chemical protection layer, the inner wall of the chemical protection layer is towards pillow core, the inner wall of the chemical protection layer is detachably fixedly connected with multiple capsules, multiple the capsule is equipped with chemical agent for killing dust mite in, and multiple the side wall of capsule is equipped with multiple through holes;Multiple the capsule is extruded under the support force of pillow core upwards and the pressure of user's head downwards, and then the chemical agent in multiple the capsule is extruded from corresponding through hole, the chemical agent is adsorbed on the inner wall of chemical protection layer or pillow surface, forms chemical agent layered structure, for preventing or reducing dust mite breeding.The purpose is to solve the problem that mite breeding in pillow core still moves everywhere when pillow cover is replaced in the prior art, and part of mite moves to the surface of newly replaced pillow cover and contacts with user, and causes allergic disease.

Description

Technical Field

[0001] This invention relates to the field of anti-mite pillowcase technology, specifically to an anti-dust mite pillowcase and its preparation method. Background Technology

[0002] The secretions, excrement, and body fragments of dust mites can trigger various allergic diseases such as asthma, allergic rhinitis, and atopic dermatitis. As one of the bedding items that comes into closest contact with the human respiratory tract, pillows are extremely prone to accumulating dust mites.

[0003] Currently, anti-mite pillowcases prevent mites and their allergens from penetrating the pillowcase through the pillow by increasing fabric density (typically requiring fabric pore size less than 10 micrometers) or using a multi-layer composite structure. For example, Chinese patent application number CN202423199584.8 discloses an anti-mite pillowcase fabric, including a fabric body, with a polyester support layer and a supporting polyester pad covering the upper layer of the fabric body. The outer surface of the polyester support layer has multiple through holes spaced apart, and a memory foam block is fixedly connected to the center of the upper layer of the fabric body. A silver fiber textile layer is fixed to the upper surface of the memory foam block, and multiple sets of through grooves are spaced apart on the lower surface of the memory foam block. This application, through the polyester support layer, supporting polyester pad, and through holes, facilitates increasing the distance between the fabric body and the silver fiber textile layer, increasing the ventilation performance between the fabric body and the silver fiber textile layer, effectively improving the breathability of the fabric, ensuring the head is dry and comfortable during sleep, and also helping to dissipate moisture inside the pillowcase, reducing the environmental conditions for mite breeding.

[0004] However, the mites still survive in the pillow core even after the above methods. When the pillowcase is replaced, the mites that have multiplied in the pillow core will still move around, and some mites will move to the surface of the newly replaced pillowcase and come into contact with the user, causing allergic diseases. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a dust mite-proof pillowcase and its preparation method, so as to solve the problem in the prior art that when the pillowcase is replaced, the mites that breed inside the pillow core still move around everywhere, and some mites will move to the surface of the newly replaced pillowcase and come into contact with the user, causing allergic diseases.

[0006] This invention is achieved through the following technical solution: A dust mite-proof pillowcase includes a physical protective layer, a chemical protective layer fixedly connected to the inner wall of the physical protective layer, the inner wall of the chemical protective layer facing the pillow core, and a plurality of sacs detachably fixedly connected to the inner wall of the chemical protective layer. Each of the plurality of sacs contains a chemical agent for killing dust mites, and a plurality of through holes are provided on the side wall of each of the plurality of sacs. When the physical protective layer is pressed by the user's head, it causes the chemical protective layer to deform and collapse downwards. Multiple sacs are squeezed under the combined action of the upward support force of the pillow core and the downward pressure of the user's head, thereby squeezing out the chemical agents in the multiple sacs from the corresponding through holes. The chemical agents are adsorbed on the inner wall of the chemical protective layer or the surface of the pillow core, forming a layered structure of chemical agents to prevent or reduce the growth of dust mites.

[0007] Furthermore, the physical protective layer is divided into a core pressure-bearing area and an edge transition area. The core pressure-bearing area is located in the central region of the physical protective layer, and the edge transition area extends outward around the core pressure-bearing area. The number of capsules set in the chemical protective layer corresponding to the core pressure-bearing area is greater than the number of capsules set in the chemical protective layer corresponding to the edge transition area. When the user's head applies pressure to the core pressure zone at a higher frequency than that to the edge transition zone, the chemical agent is released in a differentiated manner.

[0008] Furthermore, both the physical protective layer and the chemical protective layer are black; The physical and chemical protective layers can absorb light energy and convert it into heat energy under daylight conditions to increase the temperature of the physical protective layer and pillow core, thereby helping to kill dust mites.

[0009] Furthermore, a protruding ridge and a sealing strip are fixedly connected to the opening of the chemical protective layer. The protruding ridge and the sealing strip are arranged opposite to each other, and the sealing strip has a groove that matches the protruding ridge. When the protruding snap-fit ​​connection is made in the groove, the opening of the chemical protective layer forms a sealed structure, thereby restricting dust mites from moving to the physical protective layer and coming into contact with the user's head.

[0010] Furthermore, a diaphragm is provided between the plurality of capsules and the chemical protective layer, the plurality of capsules are fixedly connected to the inner wall of the diaphragm, and the outer wall of the diaphragm is detachably attached to the inner wall of the chemical protective layer; When the physical and chemical protective layers need to be cleaned, the protrusions are disengaged from the grooves, and the physical and chemical protective layers are separated from the diaphragm, thereby retaining multiple capsules on the diaphragm and extending the service life of the physical and chemical protective layers.

[0011] Furthermore, the physical protective layer is a high-density woven fabric with an average pore size of less than 10 micrometers; The average pore size is smaller than the size of adult dust mites and their eggs, so as to physically block dust mites and their excrement from penetrating the physical protective layer.

[0012] Furthermore, the chemical protective layer is a modified black thermoplastic polyurethane film, and the chemical protective layer contains the following components by weight percentage: 70-80% resin; 18-25% carbon black; 1-3% graphene; 0.5-1% antioxidant; and 0.5-1% light stabilizer.

[0013] Furthermore, the chemical agent comprises the following components by weight percentage: 60-90% plant essential oil mixture, 5-25% benzyl benzoate; 4-10% surfactant; and 1-5% antioxidant.

[0014] A method for preparing a dust mite-proof pillowcase includes the following steps: S1: To prepare the chemical protective layer, 70-80% resin, 18-25% carbon black, 1-3% graphene, 0.5-1% antioxidant and 0.5-1% light stabilizer are mixed evenly and then melt-extruded and cast into a film to obtain a modified black thermoplastic polyurethane film. S2: To prepare the chemical agent, 60-90% of a mixture of plant essential oils, 5-25% of benzyl benzoate, 4-10% of a surfactant and 1-5% of an antioxidant are mixed and stirred evenly to obtain a liquid chemical agent; S3: The chemical agent is quantitatively filled into multiple capsules and sealed for later use; S4: Prepare a physical protective layer; S5: The multiple capsules obtained in step S3 are detachably and fixedly connected to the inner wall of the chemical protective layer obtained in S1, and the outer wall of the chemical protective layer is then fixedly connected to the inner wall of the physical protective layer.

[0015] Furthermore, S4 includes the following steps: S41: Select ultrafine fibers with a single filament diameter of 3 to 12 micrometers as raw materials for warp and weft yarns; S42: The warp and weft yarns are woven together, and high-shrinkage nylon yarns are mixed or arranged in the warp or weft yarns to obtain a greige fabric. S43: The fabric is shrunk to shrink the warp and weft directions to obtain a high-density woven fabric with an average pore size of less than 10 micrometers. S44: Set the high-density woven fabric after shrinkage.

[0016] The beneficial effects of this invention are as follows: This invention relates to a dust mite-proof pillowcase and its preparation method. A chemical protective layer containing multiple cysts is fitted over the pillow core. When not under pressure, the cysts remain intact, and the chemical agents do not overflow from the pores due to surface tension. During normal sleep or lying down, the weight of the user's head naturally presses against the pillowcase, causing the cysts to automatically respond and release the chemical agents. Because a small amount of chemical agent is released with each pressure application during sleep, the inner wall of the chemical protective layer and the surface of the pillow core maintain an effective drug concentration. When the chemical agents within the cysts are depleted, the cysts are detachable, allowing the user to replace them and continue using the pillowcase. Compared to existing technologies, the released agents directly kill mites on the surface and inner wall of the pillow core, rather than simply blocking them, thus reducing the risk of secondary contact during pillowcase replacement. This further reduces the risk of some mites migrating to the newly replaced pillowcase surface and causing allergic reactions in the user. Furthermore, the chemical agents can be released multiple times as needed, and the capsule and chemical protective layer are removable, extending the overall effective lifespan of the pillowcase. Frequent washing or replacement of the pillowcase reduces the impact on its protective performance.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of the present invention. Figure 2 ; Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram showing the connection between the physical protective layer and the chemical protective layer of the present invention; Figure 6 For the present invention Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is a flowchart of the preparation method of the dust mite-proof pillowcase of the present invention; Figure 8 This is a flowchart illustrating the preparation of the physical protective layer for this invention.

[0019] In the diagram: 1. Physical protective layer; 2. Chemical protective layer; 3. Pillow core; 4. Enclosure; 5. Through hole; 6. Core pressure zone; 7. Edge transition zone; 8. Rib; 9. Sealing strip; 10. Groove; 11. Diaphragm. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0025] Please see Figures 1 to 6The present invention provides a technical solution: a dust mite-proof pillowcase, including a physical protective layer 1, a chemical protective layer 2 fixedly connected to the inner wall of the physical protective layer 1, the inner wall of the chemical protective layer 2 facing the pillow core 3, a plurality of sacs 4 detachably fixedly connected to the inner wall of the chemical protective layer 2, each of the plurality of sacs 4 containing a chemical agent for killing dust mites, and a plurality of through holes 5 opened on the side wall of each of the plurality of sacs 4; When the physical protective layer 1 is pressed by the user's head, it causes the chemical protective layer 2 to deform and collapse downwards. The multiple sacs 4 are squeezed under the combined action of the upward support force of the pillow core 3 and the downward pressure of the user's head, thereby squeezing out the chemical agents inside the multiple sacs 4 from the corresponding through holes 5. The chemical agents are adsorbed on the inner wall of the chemical protective layer 2 or the surface of the pillow core 3, forming a layered structure of chemical agents, which is used to prevent or reduce the growth of dust mites.

[0026] The physical protective layer 1 is a high-density woven fabric with an average pore size of less than 10 micrometers. The average pore size is smaller than the size of adult dust mites and their eggs, so as to physically block dust mites and their excrement from penetrating the physical protective layer 1.

[0027] The chemical protective layer 2 is a modified black thermoplastic polyurethane film, and the chemical protective layer 2 contains the following components by weight percentage: 70-80% resin; 18-25% carbon black; 1-3% graphene; 0.5-1% antioxidant; and 0.5-1% light stabilizer.

[0028] The chemical agent comprises the following components by weight percentage: 60-90% plant essential oil mixture, 5-25% benzyl benzoate; 4-10% surfactant; and 1-5% antioxidant.

[0029] In this design: the physical protective layer 1 uses a high-density woven fabric with an average pore size of less than 10 micrometers. This pore size is smaller than the size of adult dust mites (100-400 micrometers), their eggs, and excrement particles. This physically intercepts mites already present inside the pillow core 3, allergens, and mites from the external environment, reducing the likelihood of mites penetrating the pillowcase and reaching the human body contact surface, while also preventing external mites from entering the pillow core 3 and multiplying.

[0030] The chemical protective layer 2 is a modified black thermoplastic polyurethane film located inside the physical protective layer 1. It contains carbon black and graphene and has good thermal conductivity and antistatic properties. It can reduce the electrostatic adsorption of nutrients such as dander on the film surface, thereby weakening the food source attachment conditions for mites.

[0031] When the user's head presses against the pillowcase, the physical protective layer 1 and the chemical protective layer 2 deform and collapse downwards, while the pillow core 3 provides upward support. Both exert bidirectional pressure on the multiple sacs 4 located between the inner wall of the chemical protective layer 2 and the pillow core 3. Under pressure, the chemicals inside the sacs 4 are squeezed out through the through-holes 5, and the released chemicals adhere to the inner wall of the chemical protective layer 2 or the surface of the pillow core 3. Since mites mainly live inside the pillow core 3 and on the inner surface of the pillowcase, the released chemicals can directly act on the inner wall of the chemical protective layer 2 or the surface of the pillow core 3. The active ingredients in the chemicals can interfere with the mite's nervous system or dissolve its body wall, achieving a killing or repelling effect.

[0032] In use, the chemical protective layer 2, containing multiple sacs 4, is placed over the pillow core 3, facing outwards. When not under pressure, the sacs 4 remain intact, and the chemicals do not overflow excessively from the openings 5 ​​due to surface tension. During normal sleep or lying down, the weight of the head naturally presses against the pillowcase, and the sacs 4 automatically respond by releasing the chemicals. Because a small amount of chemicals is released with each pressure point during sleep, the inner wall of the chemical protective layer 2 and the surface of the pillow core 3 maintain an effective drug concentration. When the chemicals in the sacs 4 are depleted, the users can replace them with new ones, as the sacs 4 are detachable, and the pillowcase can continue to be used.

[0033] Compared to existing technologies, the released agent directly kills mites on the surface and inner wall of the pillow core 3, rather than simply blocking them, thus reducing the risk of secondary contact during pillowcase replacement. This reduces the risk of some mites migrating to the newly replaced pillowcase surface and causing allergic reactions upon contact with the user. Furthermore, the chemical agent can be released multiple times as needed, and the capsule 4 and chemical protective layer 2 are removable, extending the overall effective lifespan of the pillowcase. Frequent washing or replacement of the pillowcase minimizes the impact on its protective performance.

[0034] In this embodiment: the physical protective layer 1 is divided into a core pressure-bearing area 6 and an edge transition area 7. The core pressure-bearing area 6 is located in the central region of the physical protective layer 1. The edge transition area 7 extends outward around the core pressure-bearing area 6. The number of capsules 4 provided by the chemical protective layer 2 corresponding to the core pressure-bearing area 6 is greater than the number of capsules 4 provided by the chemical protective layer 2 corresponding to the edge transition area 7. When the user's head applies pressure to the core pressure zone 6 at a higher frequency than that to the edge transition zone 7, the chemical agent is released in a differentiated manner.

[0035] In this design, when a user sleeps or lies down, the probability of their head's center of gravity falling on the central area of ​​the pillowcase is relatively high. This results in the core pressure zone 6 experiencing significantly higher frequency, amplitude, and total duration of pressure compared to the peripheral transition zone 7. Linking the density of the pillowcase 4 to the actual probability of pressure, rather than a uniform distribution, allows for more effective release of the chemical agents. Under frequent pressure, this area releases a larger total amount of chemical agents at a higher frequency. Under less pressure, the amount of chemical agents released is correspondingly reduced, avoiding waste.

[0036] In this embodiment: both the physical protective layer 1 and the chemical protective layer 2 are black; The physical protective layer 1 and the chemical protective layer 2 can absorb light energy and convert it into heat energy under daylight conditions to increase the temperature of the physical protective layer 1 and the pillow core 3, thereby helping to kill dust mites.

[0037] The opening of the chemical protective layer 2 is fixedly connected with a protruding rib 8 and a sealing strip 9. The protruding rib 8 and the sealing strip 9 are arranged opposite to each other, and the sealing strip 9 has a groove 10 that matches the protruding rib 8. When the protruding ridge 8 is snapped into the groove 10, the opening of the chemical protective layer 2 forms a sealed structure, thereby restricting dust mites from moving to the physical protective layer 1 and coming into contact with the user's head.

[0038] In this design, both the physical protective layer 1 (high-density woven fabric) and the chemical protective layer 2 (modified black thermoplastic polyurethane film) are black. The black surface has extremely high light absorption in the visible and near-infrared bands and extremely low reflectivity. Under sunlight conditions in the bedroom, the two black layers absorb light energy, causing intensified molecular vibrations and converting the light energy into heat energy, thus raising the temperature of the pillowcase surface and the temperature conducted to the inside of the pillow core 3.

[0039] The optimal survival temperature for dust mites is 20-30℃. When the ambient temperature rises above 45℃, the proteins in the mites begin to denature; reaching 50-55℃ and maintaining it for a certain period can lead to the death of adult mites and their eggs. Part of the heat generated by sunlight is conducted into the pillow core 3, raising its overall temperature and thus killing the mites. This process relies entirely on natural sunlight, requiring no electric heating or other external energy input, achieving zero-energy passive thermal mite killing.

[0040] Furthermore, increased temperature accelerates the volatilization and diffusion of plant essential oils in the chemical agents and the molecular movement of benzyl benzoate, resulting in a more uniform distribution of the chemical agents within the pillow core 3 and enhanced permeability. The synergistic effect of high temperature and chemical agents can achieve the same kill rate at lower chemical concentrations and in a shorter time, reducing dependence on chemical agents.

[0041] Furthermore, the snap seal between the protruding ridge 8 and the groove 10 directly seals the opening of the chemical protective layer 2, cutting off the large channel between the internal space of the pillow core 3 and the outer side of the physical protective layer 1, limiting the speed at which mites migrate outward to the user's contact surface, and also accelerating the heating rate of the pillow core 3 under sunlight.

[0042] In this embodiment: a diaphragm 11 is provided between the plurality of capsules 4 and the chemical protective layer 2, the plurality of capsules 4 are fixedly connected to the inner wall of the diaphragm 11, and the outer wall of the diaphragm 11 is detachably attached to the inner wall of the chemical protective layer 2; When the physical protective layer 1 and the chemical protective layer 2 need to be cleaned, the protruding ridge 8 is disengaged from the groove 10, and the physical protective layer 1 and the chemical protective layer 2 are separated from the diaphragm 11, thereby retaining the multiple capsules 4 on the diaphragm 11, thus extending the service life of the physical protective layer 1 and the chemical protective layer 2.

[0043] In this design, the outer wall of the diaphragm 11 and the inner wall of the chemical protective layer 2 are tightly fitted during normal use, ensuring that the deformation of the physical protective layer 1 and the chemical protective layer 2 can be effectively transferred to the diaphragm 11, thereby squeezing the capsule 4 to release the chemical agent. When it is necessary to clean the chemical protective layer 2 and the physical protective layer 1, the protrusion 8 at the opening of the chemical protective layer 2 is disengaged from the groove 10 to release the seal. The user can then peel and pull the diaphragm 11 (along with the capsule 4) from the inner wall of the chemical protective layer 2 through the opening, achieving physical separation of the two components.

[0044] The physical protective layer 1 and the chemical protective layer 2, as the outer layers that come into direct contact with the human body, can be washed regularly to remove dander, sweat, and dirt, restoring breathability and hygiene. Furthermore, the capsule 4 is removed during washing, preventing premature consumption of chemicals, aging or damage to the capsule material caused by washing, thus extending its service life.

[0045] Please see Figures 7 to 8 A method for preparing a dust mite-proof pillowcase includes the following steps: S1: To prepare the chemical protective layer 2, 70-80% resin, 18-25% carbon black, 1-3% graphene, 0.5-1% antioxidant and 0.5-1% light stabilizer are mixed evenly and then melt-extruded and cast into a film to obtain a modified black thermoplastic polyurethane film. S2: To prepare the chemical agent, 60-90% of a mixture of plant essential oils, 5-25% of benzyl benzoate, 4-10% of a surfactant and 1-5% of an antioxidant are mixed and stirred evenly to obtain a liquid chemical agent; S3: The chemical agent is quantitatively filled into multiple capsules 4 and sealed for later use; S4: Prepare physical protective layer 1; S5: The multiple capsules 4 obtained in step S3 are detachably and fixedly connected to the inner wall of the chemical protective layer 2 obtained in S1, and then the outer wall of the chemical protective layer 2 is fixedly connected to the inner wall of the physical protective layer 1.

[0046] S4 includes the following steps: S41: Select ultrafine fibers with a single filament diameter of 3 to 12 micrometers as raw materials for warp and weft yarns; S42: The warp and weft yarns are woven together, and high-shrinkage nylon yarns are mixed or arranged in the warp or weft yarns to obtain a greige fabric. S43: The fabric is shrunk to shrink the warp and weft directions to obtain a high-density woven fabric with an average pore size of less than 10 micrometers. S44: Set the high-density woven fabric after shrinkage.

[0047] In this scheme: the chemical protective layer 2 is prepared using a melt extrusion casting film-forming process. The resin matrix is ​​blended with functional fillers (carbon black, graphene) and processing aids (antioxidants, light stabilizers), and then melted, extruded, cast, and cooled at high temperatures to form a continuous film. The core of this process lies in the synergistic effect of each component: thermoplastic polyurethane, as the film-forming substrate, provides flexibility and mechanical support, giving the film the ability to adhere and deform with the physical protective layer 1; carbon black gives the film a black appearance by absorbing light and generating heat, while also acting as an ultraviolet absorber to enhance the film's weather resistance; the layered structure of graphene forms a thermally conductive network in the film, improving thermal conductivity and ensuring that absorbed light energy is quickly converted into heat energy and evenly distributed; its conductivity also helps eliminate static electricity accumulation; antioxidants and light stabilizers capture free radicals at the molecular level and inhibit photo-oxidative degradation, allowing the film to maintain stable performance during long-term sun exposure and use.

[0048] Carbon black and graphene, both black fillers, work together to create a highly efficient light absorption system. Under daylight, the film surface absorbs visible and near-infrared light and rapidly heats up, not only directly killing mites through heat but also improving the film's flexibility, making it easier to deform and collapse under pressure from the user's head, thus enhancing the sensitivity of pressure-responsive release. Simultaneously, the antistatic function reduces the electrostatic adsorption of dander on the inner surface of the pillowcase, weakening the attachment conditions for mites' food sources and inhibiting mite growth from an environmental engineering perspective.

[0049] The chemical agent uses a mixture of plant essential oils as the main active ingredient, combined with benzyl benzoate, surfactants, and antioxidants. Terpenes in the plant essential oils can interfere with the activity of acetylcholinesterase in the mite's nervous system or act on its respiratory system, exhibiting both fumigation and contact killing effects. Benzyl benzoate, on the other hand, dissolves the lipid layer of the mite's body wall, leading to dehydration and death. Since their mechanisms of action differ, their combined use covers different target pathways, producing a synergistic effect and effectively reducing the concentration of any single ingredient. Surfactants promote the formation of a stable emulsion system in water, facilitating even spreading after filling and release. They also reduce the surface tension of the solution, making it easier to squeeze out from the pores 5 of the capsule and quickly wet the surface of the pillow core 3. The addition of antioxidants prevents the unsaturated terpenes in the plant essential oils from oxidizing and deteriorating during storage and use, extending the effective lifespan of the chemical agent.

[0050] The liquid chemical agent exhibits good fluidity when the capsule 4 is compressed, allowing it to be quickly squeezed out from the through-hole 5, avoiding the slow release problem of paste or solid agents. After release, the chemical agent forms a thin film on the surface of the pillow core 3. Since mites primarily inhabit the surface of the pillow core 3 and the inner wall of the pillowcase, the chemical agent can directly act on the target area, reducing ineffective diffusion and waste.

[0051] Ultrafine fibers with a single filament diameter of 3 to 12 micrometers are selected as the raw materials for warp and weft yarns, which are much finer than conventional textile fibers. The extremely fine single filaments result in a very high packing density between fibers after weaving, and the pores between fibers are greatly reduced; at the same time, the ultrafine fibers have a large specific surface area, which can enhance the moisture wicking and breathability of the fabric through capillary effect, achieving high-density barrier properties without being stuffy, which is crucial for the sleeping comfort of the pillowcase.

[0052] High-shrinkage nylon yarn undergoes significant thermal shrinkage during subsequent heat treatment, generating substantial shrinkage stress. This stress pulls on the surrounding microfibers, further tightening and closing the previously relatively loose gaps between the warp and weft yarns. The difference in shrinkage rates between high-shrinkage nylon yarn and microfiber creates an "active tightening" mechanism, which does not require reaching its limit through high-density weaving itself, but rather relies on post-treatment shrinkage to reinforce and precisely control the pore size.

[0053] Shrinkage treatment typically employs hot water baths or steam treatments. Under humid and hot conditions, high-shrinkage nylon yarn undergoes chain segment disorientation and crystal rearrangement, resulting in significant dimensional shrinkage. This shrinkage is anisotropic, requiring simultaneous control of the shrinkage rate in both the warp and weft directions to ensure uniform and compact fabric density within a two-dimensional plane. As the yarn spacing decreases, the pores originally present in the fabric are compressed to an even smaller size. Due to the extreme fineness of the microfibers, the fabric retains its soft hand feel and flexibility even after shrinkage, preventing it from becoming stiff and rigid due to high density. By controlling the shrinkage temperature, time, and tension, precise control of the pore size can be achieved, ultimately stabilizing the average pore size at below 10 micrometers.

[0054] Setting treatment involves heat setting or resin finishing of the fabric after shrinkage. Its purpose is to fix the fiber arrangement after shrinkage, eliminate internal stress generated during shrinkage, and prevent the fabric from springing back or continuing to shrink during subsequent use or washing. Set fabrics exhibit high dimensional stability, uniform pore size distribution, and durable and reliable physical barrier properties.

[0055] Finally, the bladder 4 is detachably fixed to the inner wall of the chemical protective layer 2, and the physical protective layer 1 is fixedly connected to the outer wall of the chemical protective layer 2. The entire assembly sequence ensures the precise relative positions between the functional layers, enabling the pillowcase to achieve synergistic protection through physical barrier, photothermal assistance, and pressure release in actual use.

[0056] Compared to existing technologies, the released chemical agents directly kill mites on the surface and inner wall of the pillow core 3, rather than simply blocking them, thus reducing the risk of secondary contact during pillowcase replacement. This reduces the risk of some mites migrating to the newly replaced pillowcase surface and causing allergic reactions upon contact with the user. Furthermore, the chemical agents can be released multiple times as needed, and the capsule 4 and chemical protective layer 2 are removable, extending the overall effective lifespan of the pillowcase. Frequent washing or replacement of the pillowcase minimizes the impact on its protective performance.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dust mite-proof pillowcase, comprising a physical protective layer (1), characterized in that: The inner wall of the physical protective layer (1) is fixedly connected to a chemical protective layer (2), the inner wall of the chemical protective layer (2) faces the pillow core (3), and multiple sacs (4) are detachably fixedly connected to the inner wall of the chemical protective layer (2). Each of the multiple sacs (4) is filled with a chemical agent for killing dust mites, and multiple through holes (5) are opened on the side walls of the multiple sacs (4). When the physical protective layer (1) is pressed by the user's head, it will cause the chemical protective layer (2) to deform and collapse downward. The multiple sacs (4) are squeezed under the combined action of the upward support force of the pillow core (3) and the downward pressure of the user's head, thereby squeezing out the chemical agents in the multiple sacs (4) from the corresponding through holes (5). The chemical agents are adsorbed on the inner wall of the chemical protective layer (2) or the surface of the pillow core (3) to form a chemical agent layered structure, which is used to prevent or reduce the growth of dust mites.

2. The dust mite-proof pillowcase according to claim 1, characterized in that: The physical protective layer (1) is divided into a core pressure zone (6) and an edge transition zone (7). The core pressure zone (6) is located in the central area of ​​the physical protective layer (1). The edge transition zone (7) extends outward around the core pressure zone (6). The number of capsules (4) set in the chemical protective layer (2) corresponding to the core pressure zone (6) is greater than the number of capsules (4) set in the chemical protective layer (2) corresponding to the edge transition zone (7). When the user's head applies pressure to the core pressure zone (6) at a higher frequency than that to the edge transition zone (7), the chemical agent is released in a differentiated manner.

3. The dust mite-proof pillowcase according to claim 1, characterized in that: Both the physical protective layer (1) and the chemical protective layer (2) are black; The physical protective layer (1) and the chemical protective layer (2) can absorb light energy and convert it into heat energy under daylight conditions to increase the temperature of the physical protective layer (1) and the pillow core (3), thereby helping to kill dust mites.

4. The dust mite-proof pillowcase according to claim 3, characterized in that: The opening of the chemical protective layer (2) is fixedly connected with a protruding ridge (8) and a sealing strip (9). The protruding ridge (8) and the sealing strip (9) are arranged opposite to each other, and the sealing strip (9) has a groove (10) that matches the protruding ridge (8). When the protruding ridge (8) is snapped into the groove (10), the opening of the chemical protective layer (2) forms a sealed structure, thereby restricting dust mites from moving to the physical protective layer (1) and coming into contact with the user's head.

5. The dust mite-proof pillowcase according to claim 4, characterized in that: A diaphragm (11) is provided between the plurality of capsules (4) and the chemical protective layer (2). The plurality of capsules (4) are fixedly connected to the inner wall of the diaphragm (11). The outer wall of the diaphragm (11) is separably attached to the inner wall of the chemical protective layer (2). When the physical protective layer (1) and the chemical protective layer (2) need to be cleaned, the protrusion (8) is removed from the groove (10), and the physical protective layer (1) and the chemical protective layer (2) are separated from the diaphragm (11), thereby retaining multiple capsules (4) on the diaphragm (11), thus extending the service life of the physical protective layer (1) and the chemical protective layer (2).

6. The dust mite-proof pillowcase according to claim 1, characterized in that: The physical protective layer (1) is a high-density woven fabric with an average pore size of less than 10 micrometers; The average pore size is smaller than the size of adult dust mites and their eggs, so as to physically block dust mites and their excrement from penetrating the physical protective layer (1).

7. The dust mite-proof pillowcase according to claim 6, characterized in that: The chemical protective layer (2) is a modified black thermoplastic polyurethane film, and the chemical protective layer (2) contains the following components by weight percentage: 70-80% resin; 18-25% carbon black; 1-3% graphene; 0.5-1% antioxidant; and 0.5-1% light stabilizer.

8. The dust mite-proof pillowcase according to claim 7, characterized in that: The chemical agent comprises the following components by weight percentage: 60-90% plant essential oil mixture, 5-25% benzyl benzoate; 4-10% surfactant; and 1-5% antioxidant.

9. A method for preparing a dust mite-proof pillowcase, characterized in that: Includes the following steps: S1: To prepare the chemical protective layer (2), 70-80% resin, 18-25% carbon black, 1-3% graphene, 0.5-1% antioxidant and 0.5-1% light stabilizer are mixed evenly and then melt-extruded and cast into a film to obtain a modified black thermoplastic polyurethane film. S2: To prepare the chemical agent, 60-90% of a mixture of plant essential oils, 5-25% of benzyl benzoate, 4-10% of a surfactant and 1-5% of an antioxidant are mixed and stirred evenly to obtain a liquid chemical agent; S3: The chemical agent is quantitatively filled into multiple capsules (4) and sealed for later use; S4: Prepare a physical protective layer (1); S5: The multiple capsules (4) obtained in step S3 are detachably fixed to the inner wall of the chemical protective layer (2) obtained in S1, and the outer wall of the chemical protective layer (2) is fixed to the inner wall of the physical protective layer (1).

10. The method for preparing the dust mite-proof pillowcase according to claim 9, characterized in that: S4 includes the following steps: S41: Select ultrafine fibers with a single filament diameter of 3 to 12 micrometers as raw materials for warp and weft yarns; S42: The warp and weft yarns are woven together, and high-shrinkage nylon yarns are mixed or arranged in the warp or weft yarns to obtain a greige fabric. S43: The fabric is shrunk to shrink the warp and weft directions to obtain a high-density woven fabric with an average pore size of less than 10 micrometers. S44: Set the high-density woven fabric after shrinkage.

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