A super-soft and deformation-resistant medical non-woven fabric and its preparation method

Abstract

The present invention discloses a super-soft anti-deformation medical non-woven fabric and a preparation method thereof. The super-soft anti-deformation medical non-woven fabric comprises a polyurethane composite material layer, a drug release layer, a buffer fluff layer, a composite support layer and a polyethylene layer. The super-soft anti-deformation medical non-woven fabric of the present invention uses the polyurethane composite material layer as the outer layer, which can effectively prevent the influence of the external environment, ensure the wound is dry and clean, reduce the risk of infection, and at the same time increase the flexibility and reduce deformation. The drug release layer can slowly release drugs when contacting body temperature or humidity to promote healing, and poly-N-isopropylacrylamide is used, which can increase the flexibility in the longitudinal and transverse directions and help reduce interlayer deformation. The high-elastic fiber design of the buffer fluff layer can effectively buffer when an external force is applied and reduce the irritation to the skin. The composite support layer forms a network structure, which can ensure the durability during use. It has remarkable protective and medical effects, and the overall flexibility is high, improving the anti-deformation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabric processing, and specifically to a super soft and anti-deformation medical non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or random fibers and is called cloth because of its cloth appearance and certain properties. With the continuous development of medical technology, medical non-woven fabric is widely used for dressing and protecting wounds in surgical operations, wound healing and patient care.

[0003] Currently, Chinese Patent Application No.: CN202010439663.9 discloses a super soft medical non-woven fabric, which is made of the following raw materials: 25-40 parts of silk fiber, 15-17 parts of cotton and linen fiber, 8-15 parts of chitin fiber, 6-8 parts of cuprammonium fiber, 1-3 parts of softener, 3-5 parts of natural antibacterial agent, and 2-3 parts of adhesive.

[0004] However, the existing super soft medical non-woven fabrics are mostly made of single materials, lacking sufficient flexibility and elasticity, and are prone to deformation during use, thus having a negative impact on wound healing. And usually, the method of dipping is used to achieve the anti-inflammatory and antibacterial properties of the wound, with insufficient antibacterial effect, difficult to keep the wound dry and clean, and prone to infection risk. Moreover, during the preparation process of medical non-woven fabric, problems such as air bubbles and wrinkles are likely to occur during the bonding process of materials, affecting the preparation quality of medical non-woven fabric. Summary of the Invention

[0005] The purpose of the present invention is to provide a super soft and anti-deformation medical non-woven fabric and a preparation method thereof, so as to solve the problems put forward in the above background art.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A super soft and anti-deformation medical non-woven fabric includes a polyurethane composite material layer that plays an outer protection role. The bottom side of the polyurethane composite material layer is adhesively fixed with a drug release layer. The bottom side of the drug release layer is adhesively fixed with a buffer fluff layer by coating an adhesive. The bottom side of the buffer fluff layer is fixed with a composite support layer. The bottom side of the composite support layer is adhered with a polyethylene layer. The top side of the polyurethane composite material layer is coated with an antibacterial agent. The drug release layer includes a temperature and humidity sensitive polymer and microcapsules, and the microcapsules encapsulate at least one component promoting healing. The temperature and humidity sensitive polymer is poly(N-isopropylacrylamide). The buffer fluff layer is composed of ultra-fine fibers and polyurethane elastic fibers in combination. The composite support layer is composed of polyethylene and deformation-resistant reinforcing fibers.

[0007] Preferably, the component promoting healing is silver ions and / or plant extracts.

[0008] Preferably, the adhesive used between the drug release layer and the buffer fluff layer is a polyurethane adhesive.

[0009] In addition, the present invention also provides a preparation method of a super soft anti-deformation medical non-woven fabric, and the preparation method is as follows:

[0010] S1. Using the physical embedding method, mix the healing promoting component with polylactic acid, and prepare microcapsules by methods such as emulsification or spray drying to ensure that the microcapsule particles are uniform and have good drug loading capacity and controlled release characteristics;

[0011] S2. Mix the microcapsules with temperature and humidity sensitive polymers to form a uniform drug release layer, and use a film-forming method to form a layer with an appropriate thickness;

[0012] S3. Use the electrospinning technology to prepare an ultra-fine fiber layer and mix polyurethane elastic fibers to form a buffer fluff layer;

[0013] S4. Use the secondary cross-linking technology to form a network structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer;

[0014] S5. Connect the bottom side of the polyurethane composite material layer to the drug release layer by hot pressing, then use a coating device to bond and fix a buffer fluff layer on the bottom side of the drug release layer by coating an adhesive, then fix the bottom side of the buffer fluff layer to the composite support layer by hot pressing, and finally heat-seal a polyethylene layer on the bottom side of the composite support layer to form an integral structure;

[0015] S6. Coat the polyurethane composite material layer of the integral structure with an antibacterial agent to enhance the functionality of the product.

[0016] Preferably, the coating device includes a bench, a support platform fastened to the top side of the bench, a cover frame fixed to the inner side of the support platform, a cushion roller rotatably connected to the lower left side inside the cover frame, a conveying frame arranged on the right side of the cushion roller, a glue spraying head arranged on the left part of the top side of the conveying frame, a roller frame arranged on the upper right side in the middle of the glue spraying head, a glue scraping mechanism fastened to the lower left side inside the support platform, a pre-pressing mechanism installed on the lower right side inside the cover frame, a rotating roller rotatably connected to the middle lower side inside the support platform, a frame seat fastened to the top side of the support platform, two air cylinders installed on the front and rear sides of the left part of the frame seat, two sliders connected to the right output shafts of the two air cylinders, a support roller rotatably connected to the middle part inside the two sliders, a guide roller rotatably arranged inside the right side of the frame seat, and a driving motor connected to the middle part of the rear side of the guide roller. The rear side of the glue spraying head is connected to an external polyurethane adhesive supply end. The glue scraping mechanism is arranged above the glue spraying head. The pre-pressing mechanism is arranged on the right side of the top of the conveying frame. The slider is slidably connected to the left side inside the frame seat. The driving motor is fastened to the right side of the rear part of the frame seat. The central axes of the support roller and the guide roller are on the same horizontal plane.

[0017] Preferably, the glue scraping mechanism includes a frame cover fastened to the lower left side inside the support table, a servo motor installed on the upper middle side inside the frame cover, a screw rod connected to the bottom output end of the servo motor, an internal thread block threadedly connected to the outer surface of the screw rod, a reciprocating structure slidably arranged on the lower middle side inside the frame cover, a push frame fastened to the top of the reciprocating structure, and a scraping frame installed on the right side of the bottom of the reciprocating structure. The bottom end of the screw rod is rotatably connected to the frame cover. The internal thread block is arranged in the middle of the top of the push frame, and the push frame penetrates and slides inside the frame cover.

[0018] Preferably, the reciprocating structure includes a carrier frame fastened to the top of the push frame, two support blocks fixedly connected to the left rear side and the middle rear side of the bottom of the carrier frame, a first motor installed on the left side of the left rear support block, and a swing component connected to the right output end of the first motor. The swing component penetrates and is arranged on the bottom side inside the two support blocks, and the top of the swing component is fixed to the carrier frame. The right side of the bottom of the swing component is fastened to the scraping frame.

[0019] Preferably, the swing component includes a rotating shaft rod with its left end connected to the right output end of the first motor, an internal thread sleeve fixed to the right end of the rotating shaft rod, a first rotating piece rotatably connected to the outer surface of the right side of the rotating shaft rod, a second rotating piece rotatably connected to the bottom end of the first rotating piece, a positioning sleeve rotatably penetrating the inner side of the bottom end of the second rotating piece, a threaded column rotatably penetrating the middle side inside the positioning sleeve, a push rod rotatably connected to the right end of the positioning sleeve, a sliding sleeve rotatably connected to the front end of the push rod, and a sliding frame arranged on the top side of the sliding sleeve. The rotating shaft rod rotatably penetrates the bottom side inside the two support blocks. The first rotating piece is located on the right side of the support block. The internal thread sleeve is threadedly connected to the outer surface of the threaded column. The bottom of the sliding sleeve is fastened to the scraping frame. The top of the sliding frame is fixed to the carrier frame.

[0020] Preferably, sliding rods are arranged on both the left and right sides of the bottom of the sliding frame, and the left and right sides inside the sliding sleeve are respectively wrapped and slid on the outer surfaces of the two sliding rods.

[0021] Preferably, the pre-pressing mechanism includes an upright frame fixed to the left side of the rear part of the cover frame, a second motor fastened to the top side of the rear part of the upright frame, an eccentric wheel connected to the front output end of the second motor, a rotating sleeve rotatably arranged on the outer surface of the eccentric wheel, a V-shaped piece rotatably arranged at the bottom end of the rotating sleeve, a buffer rod rotatably connected to the joint of the rotating sleeve and the V-shaped piece, a first connecting rod rotatably arranged on the lower right side of the rotating sleeve, a pushing sleeve rotatably connected to the inner side of the bottom of the first connecting rod, a second connecting rod rotatably arranged at the front end of the pushing sleeve, a pressing rod rotatably connected to the bending part of the V-shaped piece, a limiting seat arranged on the middle side of the outer surface of the pressing rod, and a pressing roller rotatably connected to the bottom end of the pressing rod. The eccentric wheel is rotatably arranged on the upper part inside the upright frame. The bottom end of the V-shaped piece is rotatably connected to the second connecting rod. The pushing sleeve is wrapped and slid on the right side of the outer surface of the buffer rod. The left side of the limiting seat is fixed to the upright frame. A limiting piece is arranged on the middle left side of the outer surface of the buffer rod. A spring is connected to the right side of the pushing sleeve, and the spring is arranged on the right side of the outer surface of the buffer rod.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] For the super-flexible and anti-deformation medical non-woven fabric of the present invention, the polyurethane composite material layer is used as the outer layer, which can effectively prevent the influence of the external environment, ensure the wound is dry and clean, reduce the risk of infection, and at the same time increase the flexibility and reduce deformation; through the drug release layer, drugs can be slowly released when contacting body temperature or humidity to promote healing, and poly-N-isopropylacrylamide is used, which can increase the flexibility in the longitudinal and transverse directions and help reduce the interlayer deformation; through the high-elastic fiber design of the buffer fluff layer, it can effectively buffer when an external force is applied and reduce the irritation to the skin; through the composite support layer to form a network structure, it can ensure the durability during use; it has significant protective and medical effects, and the overall flexibility is high, improving the anti-deformation performance.

[0024] In the preparation process of the super-flexible and anti-deformation medical non-woven fabric of the present invention, a coating device is used, and a glue scraping mechanism and a pre-pressing mechanism are optimally arranged in the coating device. Through the glue scraping mechanism, the sprayed polyurethane adhesive can be scraped out into wavy grooves, reducing the generation of bubbles during lamination and ensuring the lamination effect between materials. Through the pre-pressing mechanism, the non-woven fabric can be pre-pressed in stages intermittently, enabling the polyurethane adhesive to uniformly diffuse between two pieces of materials, avoiding the overflow or uneven distribution of the polyurethane adhesive due to excessive instantaneous pressure during direct roller pressing, and enabling the polyurethane adhesive to be initially cured in a local area to form anchor points for positioning, making the subsequent roller pressing process more evenly stressed and reducing the problems of air pockets and wrinkles.

[0025] In the present invention, the threaded post can be rotated inside the positioning sleeve, so that the position of the threaded post inside the internal threaded sleeve is changed, and the first rotating piece and the second rotating piece are unfolded, thereby changing the distance between the positioning sleeve and the internal threaded sleeve, so as to adjust the stroke distance of the lateral movement of the sliding sleeve. Furthermore, it can adapt to materials of different widths. And sliding rods are arranged on the left and right sides of the bottom of the sliding frame, and the left and right sides inside the sliding sleeve are respectively wrapped and slide on the outer surfaces of the two sliding rods, ensuring the stability of the reciprocating displacement action of the sliding frame and improving the stability of the reciprocating displacement of the scraping frame.

[0026] When the present invention pre-compresses and fits the polyurethane composite layer, the drug release layer and the buffer fluff layer in advance, as the rotating sleeve moves to the lowest point, the rotating sleeve drives the V-shaped piece to rotate, so that the second connecting rod and the first connecting rod drive the pushing sleeve to move on the buffer rod while driving the buffer rod to lift upward, thereby releasing the downward pressure of the pressing rod and the pressing roller, avoiding excessive extrusion, reducing material deformation, and ensuring the pre-compression and fitting effect on the material. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural view of the super-soft anti-deformation medical non-woven fabric of the present invention;

[0028] Figure 2 is a schematic structural view of the coating equipment of the present invention;

[0029] Figure 3 is a schematic structural view of the inside of the cover frame of the present invention;

[0030] Figure 4 is a schematic structural view of the glue scraping mechanism of the present invention;

[0031] Figure 5 is a schematic structural view of the connection between the reciprocating structure and the scraping frame of the present invention;

[0032] Figure 6 of the present invention Figure 5 is a right view of the reciprocating structure;

[0033] Figure 7 is a schematic structural view of the pre-pressing mechanism of the present invention.

[0034] In the figure: polyurethane composite layer - a, drug release layer - b, buffer fluff layer - c, composite support layer - d, polyethylene layer - e, bench - 1, support platform - 2, cover frame - 3, cushion roller - 4, conveying frame - 5, glue spraying head - 6, roller frame - 7, glue scraping mechanism - 8, pre - pressing mechanism - 9, rotating roller - 10, frame base - 11, air cylinder - 12, slider - 13, support roller - 14, guide roller - 15, driving motor - 16, frame cover - 81, servo motor - 82, screw rod - 83, internal thread block - 84, reciprocating structure - 85, pushing frame - 86, scraping frame - 87, bearing frame - 851, supporting block - 852, first motor - 853, positioning component - 854, rotating shaft rod - 8541, internal thread sleeve - 8542, first rotating piece - 8543, second rotating piece - 8544, positioning sleeve - 8545, threaded column - 8546, push rod - 8547, sliding sleeve - 8548, sliding frame - 8549, sliding rod - 85491, vertical frame - 91, second motor - 92, eccentric wheel - 93, rotating sleeve - 931, V - shaped piece - 94, buffer rod - 95, first connecting rod - 96, pushing sleeve - 97, second connecting rod - 98, pressing rod - 99, limit seat - 910, pressing roller - 911, limit piece - 912, spring - 913. Detailed implementation mode

[0035] In order to further explain the technical solution of the present invention, the following will be elaborated in detail through specific embodiments.

[0036] Please refer to Figure 1 , the present invention provides a super - soft anti - deformation medical non - woven fabric, including a polyurethane composite layer a that plays an outer protection role, providing functions of waterproofing and protecting the external environment, while enhancing flexibility and reducing the risk of deformation under external forces. The bottom side of the polyurethane composite layer a is adhesively fixed with a drug release layer b. The bottom side of the drug release layer b is adhesively fixed with a buffer fluff layer c by coating an adhesive. The bottom side of the buffer fluff layer c is fixed with a composite support layer d. The bottom side of the composite support layer d is adhered with a polyethylene layer e. The top side of the polyurethane composite layer a is coated with an antibacterial agent to improve the antibacterial effect. The drug release layer b includes a temperature - and - humidity - sensitive polymer and microcapsules. The microcapsules encapsulate at least one ingredient promoting healing, and the ingredient is silver ions and / or plant extracts, which slowly release drugs when in contact with body temperature or humidity. The temperature - and - humidity - sensitive polymer is poly(N - isopropylacrylamide), which can increase the flexibility in the longitudinal and transverse directions and help reduce inter - layer deformation. The buffer fluff layer c is composed of ultra - fine fibers and polyurethane elastic fibers. Through the design of high - elastic fibers, it can effectively buffer when an external force is applied, reducing the irritation to the skin. The composite support layer d is composed of polyethylene and deformation - resistant reinforcing fibers to ensure durability during use. The adhesive used between the drug release layer b and the buffer fluff layer c is a polyurethane adhesive to enhance the bonding force between the drug release layer b and the buffer fluff layer c and ensure its firmness.

[0037] Please refer to Figures 1-7 , the present invention provides a preparation method of a super soft and anti-deformation medical non-woven fabric, and the preparation method is as follows:

[0038] S1. Using the physical embedding method, mix the healing-promoting component with polylactic acid, and prepare microcapsules by methods such as emulsification or spray drying to ensure that the microcapsule particles are uniform and have good drug loading capacity and controlled release characteristics;

[0039] S2. Mix the microcapsules with a temperature and humidity sensitive polymer to form a uniform drug release layer b, and use a film-forming method to form a layer with an appropriate thickness;

[0040] S3. Prepare an ultrafine fiber layer by electrospinning technology and mix polyurethane elastic fibers to form a buffer fluff layer c;

[0041] S4. Use the secondary cross-linking technology to form a network structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer d;

[0042] S5. Connect the bottom side of the polyurethane composite layer a to the drug release layer b by hot pressing and bonding, then use a coating device to bond and fix a buffer fluff layer c on the bottom side of the drug release layer b by coating an adhesive, and then fix the bottom side of the buffer fluff layer c to the composite support layer d by hot pressing and bonding. Finally, a polyethylene layer e is melt-bonded to the bottom side of the composite support layer d to form an overall structure;

[0043] S6. Coat the polyurethane composite layer a of the overall structure with an antibacterial agent to enhance the functionality of the product.

[0044] Among them, the coating equipment includes a bench 1, a support platform 2 fastened to the top side of the bench 1, a cover frame 3 fixed to the inner side of the support platform 2, a cushion roller 4 rotatably connected to the lower left side inside the cover frame 3, and the buffer fluff layer c entering the inside of the cover frame 3 through the cushion roller 4 plays a role in supporting and guiding. A conveying frame 5 is arranged on the right side of the cushion roller 4 to support and guide below the buffer fluff layer c. A glue spraying head 6 is arranged at the left part of the top side of the conveying frame 5, a roller frame 7 is arranged at the middle right side of the top of the glue spraying head 6, and a glue scraping mechanism 8 is fastened to the lower left side inside the support platform 2. The glue scraping mechanism 8 is arranged above the glue spraying head 6. Under the action of the glue scraping mechanism 8, the sprayed polyurethane adhesive is scraped out of the groove, reducing the generation of air bubbles during lamination and ensuring the lamination effect between materials. A pre-pressing mechanism 9 is installed at the lower right side inside the cover frame 3. The pre-pressing mechanism 9 is arranged at the right side of the top of the conveying frame 5. Through the pre-pressing mechanism 9, the non-woven fabric can be intermittently pressed in stages in advance, enabling the polyurethane adhesive to uniformly diffuse between the two materials, avoiding the overflow or uneven distribution of the polyurethane adhesive due to excessive instantaneous pressure during direct roller pressing, and enabling the polyurethane adhesive to be preliminarily cured in a local area to form anchor points for positioning, making the subsequent roller pressing process more evenly stressed and reducing the problems of air pockets and wrinkles. A rotating roller 10 is rotatably connected to the middle lower side inside the support platform 2, a frame seat 11 is fastened to the top side of the support platform 2, two air cylinders 12 are installed on the front and rear sides of the left part of the frame seat 11, two sliders 13 are connected to the right output shafts of the two air cylinders 12, a support roller 14 is rotatably connected to the middle part inside the two sliders 13, a guide roller 15 is rotatably arranged inside the right side of the frame seat 11, and a driving motor 16 is connected to the middle part of the rear side of the guide roller 15. The slider 13 is slidably connected to the left side inside the frame seat 11, the driving motor 16 is fastened to the right side of the rear part of the frame seat 11, and the central axes of the support roller 14 and the guide roller 15 are on the same horizontal plane to press and position the polyurethane composite layer a and the drug release layer b after passing through the inside of the support roller 14 and the guide roller 15, and the guide roller 15 is rotated by the driving motor 16 to provide a certain driving force. The rear side of the glue spraying head 6 is connected to an external polyurethane adhesive supply end to facilitate spraying the polyurethane adhesive above the buffer fluff layer c.

[0045] Among them, the glue scraping mechanism 8 includes a frame cover 81 fastened to the lower left side inside the support platform 2, a servo motor 82 installed on the upper middle side inside the frame cover 81, a screw rod 83 connected to the bottom output end of the servo motor 82, an internal thread block 84 threadedly connected to the outer surface of the screw rod 83, a reciprocating structure 85 slidably arranged on the lower middle side inside the frame cover 81, a push frame 86 fastened to the top of the reciprocating structure 85, and a scraper 87 installed on the right side of the bottom of the reciprocating structure 85. Under the action of the servo motor 82, the screw rod 83 drives the reciprocating structure 85 to make a longitudinal position adjustment inside the frame cover 81 through the cooperation with the internal thread block 84, so that the reciprocating structure 85 drives the scraper 87 to change the height position, so that the bottom of the scraper 87 is inserted into the polyurethane adhesive sprayed above the buffer fluff layer c, facilitating the formation of a groove above the polyurethane adhesive during the movement of the buffer fluff layer c, thereby reducing the generation of bubbles and improving the bonding effect. The bottom end of the screw rod 83 is rotatably connected to the frame cover 81, the internal thread block 84 is arranged in the middle of the top of the push frame 86, and the push frame 86 penetrates and slides inside the frame cover 81 to ensure a stable longitudinal displacement action of the push frame 86.

[0046] Among them, the reciprocating structure 85 includes a carrier 851 whose top is fastened to the push frame 86, two support blocks 852 fixedly connected to the left rear side and the middle rear side of the bottom of the carrier 851, a first motor 853 installed on the left side of the left rear support block 852, and a swing component 854 connected to the right output end of the first motor 853. The swing component 854 penetrates and is arranged at the bottom side inside the two support blocks 852, and the top of the swing component 854 is fixed to the carrier 851. The right side of the bottom of the swing component 854 is fastened to the scraper 87, so that the first motor 853 drives the swing component 854 to drive the scraper 87 to make a reciprocating movement in the front-rear direction, so as to reciprocate and shift inside the overall polyurethane adhesive above the buffer fluff layer c. Through the displacement and conveying of the buffer fluff layer c, the groove scraped by the scraper 87 in the polyurethane adhesive is wavy, improving the bonding effect.

[0047] Among them, the positioning component 854 includes a rotating shaft rod 8541 with its left end connected to the right output end of the first motor 853, an internal thread sleeve 8542 fixed to the right end of the rotating shaft rod 8541, a first rotating piece 8543 rotatably connected to the outer surface of the right side of the rotating shaft rod 8541, a second rotating piece 8544 rotatably connected to the bottom end of the first rotating piece 8543, a positioning sleeve 8545 rotatably penetrating through the inner side of the bottom end of the second rotating piece 8544, a threaded column 8546 rotatably penetrating through the middle side of the positioning sleeve 8545, a push rod 8547 rotatably connected to the right end of the positioning sleeve 8545, a sliding sleeve 8548 rotatably connected to the front end of the push rod 8547, and a sliding frame 8549 arranged on the top side of the sliding sleeve 8548. The internal thread sleeve 8542 is threadedly connected to the outer surface of the threaded column 8546. Taking the first motor 853 as the power source, the internal thread sleeve 8542 drives the threaded column 8546 to perform a positioning action through the rotating shaft rod 8541, so that the first rotating piece 8543 and the second rotating piece 8544 move together with the threaded column 8546, and the push rod 8547 drives the sliding sleeve 8548 to perform a reciprocating displacement action under the bottom side of the sliding frame 8549, thereby driving the scraping frame 87 to perform a reciprocating displacement action. And the threaded column 8546 can be rotated inside the positioning sleeve 8545 to change the position of the threaded column 8546 inside the internal thread sleeve 8542, expand the first rotating piece 8543 and the second rotating piece 8544, so as to change the distance between the positioning sleeve 8545 and the internal thread sleeve 8542, adjust the stroke distance of the lateral movement of the sliding sleeve 8548, and thus can adapt to materials of different widths. The rotating shaft rod 8541 rotatably penetrates through the bottom sides of the two supporting blocks 852 to ensure the stability of rotation. The first rotating piece 8543 is located on the right side of the supporting block 852. The bottom of the sliding sleeve 8548 is fastened to the scraping frame 87. The top of the sliding frame 8549 is fixed to the bearing frame 851. Sliding rods 85491 are arranged on the left and right sides of the bottom of the sliding frame 8549. The left and right sides inside the sliding sleeve 8548 are respectively wrapped and slide on the outer surfaces of the two sliding rods 85491 to ensure the stability of the reciprocating displacement action of the sliding frame 8549.

[0048] Among them, the preloading mechanism 9 includes a vertical frame 91 fixed to the left side of the rear part of the cover frame 3, a second motor 92 fastened to the top side of the rear part of the vertical frame 91, an eccentric wheel 93 connected to the front output end of the second motor 92, a rotating sleeve 931 rotatably arranged on the outer surface of the eccentric wheel 93. Under the action of the second motor 92, the eccentric wheel 93 rotates inside the rotating sleeve 931. A V-shaped piece 94 is rotatably arranged at the bottom end of the rotating sleeve 931, a buffer rod 95 is rotatably connected to the connection part of the rotating sleeve 931 and the V-shaped piece 94, a first connecting rod 96 is rotatably arranged on the lower right side of the rotating sleeve 931, a push sleeve 97 is rotatably connected to the inner side of the bottom of the first connecting rod 96, a second connecting rod 98 is rotatably arranged at the front end of the push sleeve 97, a pressing rod 99 is rotatably connected to the bent part of the V-shaped piece 94, a limit seat 910 is arranged on the middle side of the outer surface of the pressing rod 99, and a pressing roller 911 is rotatably connected to the bottom end of the pressing rod 99. The eccentric wheel 93 is rotatably arranged at the upper part inside the vertical frame 91. The bottom end of the V-shaped piece 94 is rotatably connected to the second connecting rod 98. The push sleeve 97 is wrapped and slid on the right side of the outer surface of the buffer rod 95. During the process of the eccentric wheel 93 driving the rotating sleeve 931 to rotate, the rotating sleeve 931 can make a reciprocating swing in the up and down position. The rotating sleeve 931 drives the pressing rod 99 to move down through the V-shaped piece 94 and then drives the pressing roller 911 to move down to contact above the polyurethane composite material layer a, applying a downward pressure to the polyurethane composite material layer a to make the drug release layer b be intermittently pressed and adhered above the buffer fluff layer c. When being pressed and adhered, as the rotating sleeve 931 moves to the lowest point, the rotating sleeve 931 drives the V-shaped piece 94 to rotate, so that while the second connecting rod 98 and the first connecting rod 96 drive the push sleeve 97 to move on the buffer rod 95, the buffer rod 95 is lifted upward, thereby releasing the downward pressure of the pressing rod 99 and the pressing roller 911 to avoid excessive extrusion. The left side of the limit seat 910 is fixed to the vertical frame 91, and a limit piece 912 is arranged on the middle left side of the outer surface of the buffer rod 95 to play a role in limiting the push sleeve 97 and defining the moving stroke of the push sleeve 97. A spring 913 is connected to the right side of the push sleeve 97, and the spring 913 is arranged on the right side of the outer surface of the buffer rod 95 to provide a reset acting force for the push sleeve 97 through the spring 913.

[0049] The working principle of the coating equipment is as follows:

[0050] First, the heat-pressed and bonded polyurethane composite material layer a and the drug release layer b are threaded through the inner sides of the support rollers 14 and the guide rollers 15, and the drug release layer is located at the bottom side. Then, after the right side of the polyurethane composite material layer a contacts the rotating roller 10, the polyurethane composite material layer a is threaded out from the lower left side to the right side of the roller frame 7. Then, the buffer fluff layer c is threaded through the lower side of the spray head 6 from above the cushion roller 4, and then the lower side of the buffer fluff layer c contacts the conveying frame 5.

[0051] Second, according to the width of the buffer fluff layer c, the rotatable threaded column 8546 can be rotated to change the position of the threaded column 8546 inside the internal threaded sleeve 8542, unfold the first rotating piece 8543 and the second rotating piece 8544, thereby changing the distance between the positioning sleeve 8545 and the internal threaded sleeve 8542 to adjust the stroke distance of the lateral movement of the sliding sleeve 8548. Then, control the start of the servo motor 82. Under the action of the servo motor 82, the screw rod 83 drives the reciprocating structure 85 to make a longitudinal position adjustment inside the frame cover 81 through the cooperation with the internal threaded block 84, so that the reciprocating structure 85 drives the scraping frame 87 to change its height position, so that the bottom of the scraping frame 87 is close to above the buffer fluff layer c. After spraying polyurethane adhesive above the buffer fluff layer c, insert the scraping frame 87 into the polyurethane adhesive;

[0052] Third, during the process of pulling the polyurethane composite layer a, the drug release layer b, and the buffer fluff layer c to move rightward, the polyurethane adhesive is sprayed above the buffer fluff layer c through the glue spraying head 6. Then, control the start of the first motor 853 to rotate the rotating shaft rod 8541. Through the rotating shaft rod 8541, the internal threaded sleeve 8542 drives the threaded column 8546 to perform a transposition action, so that the first rotating piece 8543 and the second rotating piece 8544 act together with the threaded column 8546, and the push rod 8547 drives the sliding sleeve 8548 to perform a reciprocating displacement action on the bottom side of the sliding frame 8549, and further drives the scraping frame 87 to realize a reciprocating displacement action in the front-back direction. Through the displacement and transportation of the buffer fluff layer c, the groove scraped out by the scraping frame 87 in the polyurethane adhesive is wavy;

[0053] Fourth, after applying glue to the buffer fluff layer c, the polyurethane composite material layer a and the drug release layer b are located above the buffer fluff layer c, and the drug release layer b is close to being above the buffer fluff layer c. During the movement of the polyurethane composite material layer a, the drug release layer b, and the buffer fluff layer c, control the start of the second motor 92. Under the action of the second motor 92, drive the eccentric wheel 93 to rotate inside the rotating sleeve 931, causing the rotating sleeve 931 to make a reciprocating swing in the up and down position. During the downward rotation movement of the rotating sleeve 931, the rotating sleeve 931 drives the pressure lever 99 to move downward through the V-shaped piece 94 and then drives the pressure roller 911 to move downward to contact above the polyurethane composite material layer a, applying a downward pressure to the polyurethane composite material layer a to intermittently press and bond the drug release layer b onto the buffer fluff layer c. When pressing and bonding, as the rotating sleeve 931 moves to the lowest point, the rotating sleeve 931 drives the V-shaped piece 94 to rotate, causing the second connecting rod 98 and the first connecting rod 96 to drive the push sleeve 97 to squeeze and move the spring 913 on the buffer rod 95, and at the same time drive the buffer rod 95 to lift upward, releasing the downward pressure of the pressure lever 99 and the pressure roller 911 to avoid excessive extrusion. Furthermore, as the polyurethane composite material layer a, the drug release layer b, and the buffer fluff layer c are conveyed, the polyurethane composite material layer a and the drug release layer b are intermittently pre-pressed and bonded, improving the bonding accuracy during subsequent complete pressing.

[0054] The above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a super soft and anti-deformation medical non-woven fabric, characterized in that: The preparation method is as follows: S1. Using the physical embedding method, mix the components promoting healing with polylactic acid, and prepare microcapsules by spray drying to ensure that the microcapsule particles are uniform and have good drug loading capacity and controlled release characteristics; S2. Mix the microcapsules with temperature and humidity sensitive polymers to form a uniform drug release layer (b), and use the film-forming method to form a layer with appropriate thickness; S3. Prepare an ultrafine fiber layer by electrospinning technology and mix polyurethane elastic fibers to form a buffer fluff layer (c); S4. Use the secondary cross-linking technology to form a network structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer (d); S5. Connect the bottom side of the polyurethane composite layer (a) to the drug release layer (b) by thermocompression bonding, then use a coating device to bond and fix a buffer fluff layer (c) to the bottom side of the drug release layer (b) by coating an adhesive, and then fix the bottom side of the buffer fluff layer (c) to the composite support layer (d) by thermocompression bonding. Finally, a polyethylene layer (e) is hot-melt bonded to the bottom side of the composite support layer (d) to form an integral structure; S6. Coat the antibacterial agent on the polyurethane composite layer (a) of the integral structure to enhance the functionality of the product; The drug release layer (b) includes temperature and humidity sensitive polymers and microcapsules. The microcapsules encapsulate at least one component promoting healing. The temperature and humidity sensitive polymer is poly(N-isopropylacrylamide). The buffer fluff layer (c) is composed of ultrafine fibers and polyurethane elastic fibers. The composite support layer (d) is composed of polyethylene and deformation-resistant reinforcing fibers; The coating device includes a bench (1), a support platform (2) fastened to the top side of the bench (1), a cover frame (3) fixed to the inner side of the support platform (2), a glue scraping mechanism (8) fastened to the lower left side inside the support platform (2), and a pre-pressing mechanism (9) installed on the lower right side inside the cover frame (3); The glue scraping mechanism (8) includes a frame cover (81) fastened to the lower left side inside the support platform (2), a servo motor (82) installed on the upper middle side inside the frame cover (81), a screw rod (83) connected to the bottom output end of the servo motor (82), an internal thread block (84) threadedly connected to the outer surface of the screw rod (83), a reciprocating structure (85) slidably arranged on the lower middle side inside the frame cover (81), a push frame (86) fastened to the top of the reciprocating structure (85), and a scraping frame (87) installed on the right side of the bottom of the reciprocating structure (85). The bottom end of the screw rod (83) is rotatably connected to the frame cover (81). The internal thread block (84) is arranged in the middle of the top of the push frame (86), and the push frame (86) penetrates and slides inside the frame cover (81); The preloading mechanism (9) includes a vertical frame (91) fixed to the left side of the rear part of the cover frame (3), a second motor (92) fastened to the top side of the rear part of the vertical frame (91), an eccentric wheel (93) connected to the front output end of the second motor (92), a rotating sleeve (931) rotatably arranged on the outer surface of the eccentric wheel (93), a V-shaped piece (94) rotatably arranged at the bottom end of the rotating sleeve (931), a buffer rod (95) rotatably connected to the connection part of the rotating sleeve (931) and the V-shaped piece (94), a first connecting rod (96) rotatably arranged on the lower right side of the rotating sleeve (931), a push sleeve (97) rotatably connected to the inner side of the bottom of the first connecting rod (96), a second connecting rod (98) rotatably arranged at the front end of the push sleeve (97), a pressing rod (99) rotatably connected to the bent part of the V-shaped piece (94), a limit seat (910) arranged in the middle of the outer surface of the pressing rod (99), and a pressing roller (911) rotatably connected to the bottom end of the pressing rod (99). The eccentric wheel (93) is rotatably arranged at the upper part inside the vertical frame (91). The bottom end of the V-shaped piece (94) is rotatably connected to the second connecting rod (98). The push sleeve (97) is wrapped and slid on the right side of the outer surface of the buffer rod (95). The left side of the limit seat (910) is fixed to the vertical frame (91). A limit piece (912) is arranged on the middle left side of the outer surface of the buffer rod (95). A spring (913) is connected to the right side of the push sleeve (97), and the spring (913) is arranged on the right side of the outer surface of the buffer rod (95).

2. The preparation method of a super-soft anti-deformation medical non-woven fabric according to claim 1, characterized in that: The coating equipment further includes a cushion roller (4) rotatably connected to the lower left side inside the cover frame (3), a conveying frame (5) arranged on the right side of the cushion roller (4), a glue spraying head (6) arranged on the top left part of the conveying frame (5), a roller frame (7) arranged on the middle right side of the top of the glue spraying head (6), a rotating roller (10) rotatably connected to the middle lower part inside the support platform (2), a frame seat (11) fastened to the top side of the support platform (2), two air cylinders (12) installed on the front and rear sides of the left part of the frame seat (11), two sliders (13) connected to the right output shafts of the two air cylinders (12), a support roller (14) rotatably connected to the middle part of the inner sides of the two sliders (13), a guide roller (15) rotatably arranged inside the right side of the frame seat (11), and a driving motor (16) connected to the middle part of the rear side of the guide roller (15). The rear side of the glue spraying head (6) is connected to an external polyurethane adhesive supply end. The glue scraping mechanism (8) is arranged above the glue spraying head (6). The preloading mechanism (9) is arranged on the top right side of the conveying frame (5). The slider (13) is slidably connected to the left side inside the frame seat (11). The driving motor (16) is fastened to the right side of the rear part of the frame seat (11). The central axes of the support roller (14) and the guide roller (15) are on the same horizontal plane.

3. The preparation method of a super-soft anti-deformation medical non-woven fabric according to claim 1, wherein: The reciprocating structure (85) includes a carrier frame (851) with its top fastened to the push frame (86), two support blocks (852) fixedly connected to the bottom left rear side and the middle rear side of the carrier frame (851), a first motor (853) installed on the left side of the left rear support block (852), and a swing positioning assembly (854) connected to the right output end of the first motor (853). The swing positioning assembly (854) is disposed through the inner bottom sides of the two support blocks (852), and the top of the swing positioning assembly (854) is fixed to the carrier frame (851). The right bottom side of the swing positioning assembly (854) is fastened to the scraping frame (87).

4. The preparation method of a super-soft and deformation-resistant medical non-woven fabric according to claim 3, characterized in that: The swing positioning assembly (854) includes a rotating shaft rod (8541) with its left end connected to the right output end of the first motor (853), an internal thread sleeve (8542) fixed to the right end of the rotating shaft rod (8541), a first rotating piece (8543) rotatably connected to the outer surface of the right side of the rotating shaft rod (8541), a second rotating piece (8544) rotatably connected to the bottom end of the first rotating piece (8543), a positioning sleeve (8545) rotatably penetrating through the inner bottom side of the second rotating piece (8544), a threaded column (8546) rotatably penetrating through the middle side of the positioning sleeve (8545), a push rod (8547) rotatably connected to the right end of the positioning sleeve (8545), a sliding sleeve (8548) rotatably connected to the front end of the push rod (8547), and a sliding frame (8549) disposed on the top side of the sliding sleeve (8548). The rotating shaft rod (8541) rotatably penetrates through the inner bottom sides of the two support blocks (852). The first rotating piece (8543) is located on the right side of the support block (852). The internal thread sleeve (8542) is threadedly connected to the outer surface of the threaded column (8546). The bottom of the sliding sleeve (8548) is fastened to the scraping frame (87). The top of the sliding frame (8549) is fixed to the carrier frame (851).

5. The preparation method of a super-soft anti-deformation medical non-woven fabric according to claim 4, characterized in that: Sliding rods (85491) are provided on both the left and right sides of the bottom of the sliding frame (8549). The left and right sides inside the sliding sleeve (8548) are respectively wrapped and slid on the outer surfaces of the two sliding rods (85491).

6. The medical non-woven fabric prepared by the preparation method of a super-soft and anti-deformation medical non-woven fabric according to claim 1, characterized in that: Its structure includes a polyurethane composite material layer (a) that serves as an outer layer protection. A drug release layer (b) is adhesively fixed to the bottom side of the polyurethane composite material layer (a). A buffer fluff layer (c) is adhesively fixed to the bottom side of the drug release layer (b) by coating an adhesive. A composite support layer (d) is fixed to the bottom side of the buffer fluff layer (c). A polyethylene layer (e) is adhered to the bottom side of the composite support layer (d). An antibacterial agent is coated on the top side of the polyurethane composite material layer (a).

7. The medical non-woven fabric according to claim 6, wherein: The component for promoting healing is silver ions and / or plant extracts.

8. The medical non-woven fabric according to claim 6, characterized in that: The adhesive used between the drug release layer (b) and the buffer fluff layer (c) is a polyurethane adhesive.

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