Super-soft anti-deformation medical non-woven fabric and preparation method thereof

Abstract

The 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, according to the super-soft anti-deformation medical non-woven fabric, the polyurethane composite material layer serves as the outer layer, the influence of the external environment can be effectively prevented, it is ensured that a wound is dry and clean, the infection risk is reduced, meanwhile, flexibility is improved, and deformation is reduced; the drug release layer can slowly release drugs when contacting with body temperature or humidity to promote healing, and poly N-isopropylacrylamide is used, so that longitudinal and transverse flexibility can be improved, and interlayer deformation can be reduced; due to the high-elasticity fiber design of the buffering fluff layer, effective buffering can be achieved when external force is applied, and irritation to the skin is reduced; the composite supporting layer forms a net-shaped structure, so that the durability in the using process can be ensured; the anti-deformation medical device has remarkable protection and medical effects and is high in overall flexibility, and the anti-deformation performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric processing, in particular to an ultra-soft deformation-resistant medical non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabric, also known as nonwoven fabric, is composed of directional or random fibers. It is called cloth because it has the appearance and certain properties of cloth. With the continuous development of medical technology, medical non-woven fabrics are widely used to bandage and protect wounds in surgical operations, wound healing and patient care.

[0003] At present, China's patent application number: CN202010439663.9 discloses an ultra-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 cuprammonia fiber, 1-3 parts of softener, 3-5 parts of natural antibacterial agent, and 2-3 parts of adhesive.

[0004] However, the ultra-soft medical non-woven fabrics in the prior art are mostly made of a single material, lack sufficient flexibility and elasticity, and are easily deformed during use, thereby having a negative impact on wound healing. In addition, the anti-inflammatory and antibacterial properties of the wound are usually achieved by immersion, which has insufficient antibacterial effects and is not easy to keep the wound dry and clean, which can easily lead to infection risks. In addition, in the preparation process of the medical non-woven fabrics, the bonding process between the materials is prone to produce bubbles and wrinkles, which affects the preparation quality of the medical non-woven fabrics. Summary of the invention

[0005] The object of the present invention is to provide an ultra-soft deformation-resistant medical non-woven fabric and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an ultra-soft, deformation-resistant medical non-woven fabric, comprising a polyurethane composite material layer that serves as an outer layer protection, a drug releasing layer bonded and fixed to the bottom side of the polyurethane composite material layer, a buffering fluff layer bonded and fixed to the bottom side of the drug releasing layer by coating an adhesive, a composite support layer fixed to the bottom side of the buffering fluff layer, a polyethylene layer bonded to the bottom side of the composite support layer, an antibacterial agent coated on the top side of the polyurethane composite material layer, the drug releasing layer comprises a temperature and humidity sensitive polymer, microcapsules and polylactic acid, the microcapsules are combined with healing-promoting components, the temperature and humidity sensitive polymer is poly N-isopropylacrylamide, the buffering fluff layer is composited with ultrafine fibers and polyurethane elastic fibers, and the composite support layer is composed of polyethylene and deformation-resistant reinforcing fibers.

[0007] Preferably, the microcapsules encapsulate at least one ingredient that promotes healing, and the ingredient is silver ions and / or plant extracts.

[0008] Preferably, the adhesive used between the drug-releasing layer and the buffer villi layer is a polyurethane adhesive.

[0009] In addition, the present invention also provides a method for preparing an ultra-soft deformation-resistant medical non-woven fabric, and the preparation method is as follows:

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

[0011] S2, mixing the microcapsules with the temperature and humidity sensitive polymer to form a uniform drug release layer, and forming it into a layer of suitable thickness using a film forming method;

[0012] S3, preparing an ultrafine fiber layer by electrospinning technology, and mixing polyurethane elastic fiber to form a buffering fluff layer;

[0013] S4, using secondary cross-linking technology to form a mesh structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer;

[0014] S5, connecting the bottom side of the polyurethane composite material layer to the drug release layer by means of heat-compression bonding, and then using a coating device to fix a buffering fluff layer on the bottom side of the drug release layer by applying an adhesive, and then fixing the bottom side of the buffering fluff layer to the composite support layer by means of heat-compression bonding, and finally hot-melt bonding a polyethylene layer on the bottom side of the composite support layer to form an integral structure;

[0015] S6. The polyurethane composite material layer of the overall structure is coated with an antimicrobial agent to enhance the functionality of the product.

[0016] Preferably, the coating equipment includes a stand, a support fastened to the top side of the stand, a cover frame fixed to the inner side of the support, a pad roller rotatably connected to the lower left side of the inside of the cover frame, a conveying frame arranged on the right side of the pad roller, a glue spraying head arranged on the left part of the top side of the conveying frame, a roller frame arranged on the middle right side of the top of the glue spraying head, a glue scraping mechanism fastened to the lower left side of the inside of the support, a pre-pressing mechanism installed on the lower right side of the inside of the cover frame, a rotating roller rotatably connected to the middle and lower side of the inside of the support, a frame seat fastened to the top side of the support, two cylinders installed on the front and rear sides of the left part of the frame seat, a connecting rod Two sliders connected to the output shafts on the right sides of the two cylinders, a support roller rotatably connected to the middle of the inner sides of the two sliders, a guide roller rotatably arranged on the right side inside the frame seat, and a drive motor connected to the middle of the rear side of the guide roller, the rear side of the glue spray head is connected to the external polyurethane adhesive supply end, the glue scraping mechanism is arranged above the glue spray 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 drive motor is fastened to the right side of the rear part of the frame seat, and the central axes of the support roller and the guide roller are located on the same horizontal plane.

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

[0018] Preferably, the reciprocating structure includes a carrier frame whose top is fastened to the push frame, two support blocks fixedly connected to the left rear side and 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 positioning assembly connected to the right output end of the first motor, the positioning assembly is arranged through the bottom side of the two support blocks, and the top of the positioning assembly is fixed to the carrier frame, and the right side of the bottom of the positioning assembly is fastened to the scraper frame.

[0019] Preferably, the positioning assembly includes a rotating shaft rod whose left end is connected to the right output end of the first motor, an internal threaded sleeve fixed to the right end of the rotating shaft rod, a first rotating plate rotatably connected to the right side of the outer surface of the rotating shaft rod, a second rotating plate rotatably connected to the bottom end of the first rotating plate, a positioning sleeve that passes through and rotates on the inner side of the bottom end of the second rotating plate, a threaded column that passes through and rotates on the middle side of 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 slide arranged on the top side of the sliding sleeve, the rotating shaft rod passes through and rotates on the bottom side of two supporting blocks, the first rotating plate is located on the right side of the supporting block, the internal threaded sleeve is threadedly connected to the outer surface of the threaded column, the bottom of the sliding sleeve is fastened to the scraper frame, and the top of the sliding frame is fixed to the supporting frame.

[0020] Preferably, slide bars are provided on both left and right sides of the bottom of the slide frame, and the left and right sides of the interior of the slide sleeve are respectively wrapped and slid on the outer surfaces of the two slide bars.

[0021] Preferably, the pre-stressing mechanism includes a vertical frame fixed to the cover frame on the left side of the rear portion, a second motor fastened to the top side of the rear portion of the vertical frame, an eccentric wheel connected to the output end of the front side of the second motor, a rotating sleeve rotatably arranged on the outer surface of the eccentric wheel, a V-shaped plate rotatably arranged at the bottom end of the rotating sleeve, a buffer rod rotatably connected to the connection between the rotating sleeve and the V-shaped plate, a first connecting rod rotatably arranged on the lower right side of the rotating sleeve, a push 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 push sleeve, a pressure rod rotatably connected to the bending part of the V-shaped plate, a limiting seat arranged on the middle side of the outer surface of the pressure rod, and a pressure roller rotatably connected to the bottom end of the pressure rod, the eccentric wheel is rotatably arranged on the upper inner side of the vertical frame, the bottom end of the V-shaped plate is rotatably connected to the second connecting rod, the push 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 vertical frame, the left side of the outer surface of the buffer rod is provided with a limiting plate, the right side of the push sleeve is connected with a spring, and the spring is arranged on the right side of the outer surface of the buffer rod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The ultra-soft deformation-resistant medical non-woven fabric of the present invention uses a polyurethane composite material layer as an outer layer, which can effectively prevent the influence of the external environment, ensure that the wound is dry and clean, reduce the risk of infection, and at the same time increase flexibility and reduce deformation; the drug release layer can slowly release the drug when it comes into contact with body temperature or humidity to promote healing, and the use of poly N-isopropylacrylamide can increase the longitudinal and lateral flexibility, which helps to reduce interlayer deformation; the high elastic fiber design of the buffering fluff layer can effectively buffer when external force is applied to reduce irritation to the skin; the composite support layer forms a mesh structure to ensure durability during use; it has significant protective and medical effects, and has high overall flexibility, which improves the deformation-resistant performance.

[0024] The present invention uses a coating device in the preparation process of the ultra-soft deformation-resistant medical non-woven fabric, and a scraping mechanism and a pre-pressing mechanism are optimally arranged in the coating device. The scraping mechanism can make the sprayed polyurethane adhesive be scraped out to form wavy grooves, reduce the generation of bubbles during bonding, and ensure the bonding effect between the materials. The pre-pressing mechanism can pre-stage intermittent pressing of the non-woven fabric to make the polyurethane adhesive evenly diffuse between the two pieces of material, avoid overflow or uneven distribution of the polyurethane adhesive due to excessive instantaneous pressure during direct rolling, and make the polyurethane adhesive initially solidified in a local area to form an anchor point for positioning, so that the subsequent rolling process is more evenly stressed, and the hollowing phenomenon and wrinkle problems are reduced.

[0025] The present invention can rotate the threaded column inside the positioning sleeve to change the position of the threaded column inside the internal threaded sleeve, expand the first rotating plate and the second rotating plate, thereby changing the distance between the positioning sleeve and the internal threaded sleeve to adjust the stroke distance of the lateral movement of the sliding sleeve, thereby adapting 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 of the sliding sleeve are respectively wrapped and slid on the outer surfaces of the two sliding rods, thereby ensuring the stability of the reciprocating displacement of the sliding frame and improving the stability of the reciprocating displacement of the scraper frame.

[0026] When the polyurethane composite material layer, the drug release layer and the buffer fluff layer are pre-pressed and fitted, as the rotating sleeve moves to the lowest point, the rotating sleeve drives the V-shaped plate to rotate, so that the second connecting rod and the first connecting rod drive the push sleeve to move on the buffer rod and drive the buffer rod to lift upward, thereby releasing the downward pressure of the pressure rod and the pressure roller, avoiding excessive extrusion, reducing material deformation, and ensuring the pre-pressing and fitting effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the ultra-soft deformation-resistant medical non-woven fabric of the present invention;

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

[0029] Figure 3 It is a schematic diagram of the structure inside the cover frame of the present invention;

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

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

[0032] Figure 6 For the present invention Figure 5 A right view of the reciprocating structure in FIG.

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

[0034] In the figure: polyurethane composite material layer-a, drug release layer-b, buffer villi layer-c, composite support layer-d, polyethylene layer-e, stand-1, support stand-2, cover frame-3, pad roller-4, conveyor frame-5, glue spray head-6, roller frame-7, glue scraping mechanism-8, pre-pressing mechanism-9, rotating roller-10, frame seat-11, cylinder-12, slider-13, support roller-14, guide roller-15, drive motor-16, frame cover-81, servo motor-82, screw-83, internal thread block-84, reciprocating structure-85, push frame-86, scraper frame-87, bearing frame-851, support block-852, first Motor 853, positioning assembly 854, rotating shaft rod 8541, internal threaded sleeve 8542, first rotating plate 8543, second rotating plate 8544, positioning sleeve 8545, threaded column 8546, push rod 8547, sliding sleeve 8548, slide 8549, slide rod 85491, stand 91, second motor 92, eccentric wheel 93, rotating sleeve 931, V-shaped plate 94, buffer rod 95, first connecting rod 96, push sleeve 97, second connecting rod 98, pressure rod 99, limit seat 910, pressure roller 911, limit plate 912, spring 913. DETAILED DESCRIPTION

[0035] In order to further explain the technical solution of the present invention, it is described in detail below through specific embodiments.

[0036] See also Figure 1 The present invention provides an ultra-soft deformation-resistant medical non-woven fabric, comprising a polyurethane composite material layer a that plays an outer protective role, provides waterproofing and external environment protection functions, and at the same time enhances flexibility and reduces the risk of deformation under external force. A drug release layer b is bonded and fixed to the bottom side of the polyurethane composite material layer a, a buffering fluff layer c is bonded and 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 buffering fluff layer c, a polyethylene layer e is bonded 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 to improve the antibacterial effect, and the drug release layer b comprises a temperature and humidity sensitive polymer, a microcapsule and polylactic acid, and the microcapsule encapsulates at least one component that promotes healing , ingredients are silver ions and / or plant extracts, which slowly release drugs when exposed to body temperature or humidity. The temperature and humidity sensitive polymer is poly N-isopropyl acrylamide, which can increase longitudinal and lateral flexibility and help reduce interlayer deformation. The buffering villi layer c is made of a composite of ultrafine fibers and polyurethane elastic fibers. Through the high-elastic fiber design, it can effectively buffer when external force is applied and reduce irritation to the skin. The composite support layer d is composed of polyethylene and deformation-resistant reinforced fibers to ensure durability during use. The adhesive used between the drug release layer b and the buffering villi layer c is a polyurethane adhesive to enhance the bonding force between the drug release layer b and the buffering villi layer c and ensure its firmness.

[0037] See also Figure 1-Figure 7 The present invention provides a method for preparing an ultra-soft deformation-resistant medical non-woven fabric, and the preparation method is as follows:

[0038] S1. Use the physical encapsulation method to mix the healing promoting ingredients with polylactic acid, and prepare microcapsules by emulsification or spray drying to ensure that the microcapsule particles are uniform and have good drug loading capacity and controlled release characteristics;

[0039] S2, mixing the microcapsules with the temperature and humidity sensitive polymer to form a uniform drug release layer b, and forming it into a layer of suitable thickness using a film forming method;

[0040] S3, preparing an ultrafine fiber layer by electrospinning technology, and mixing it with polyurethane elastic fiber to form a buffering fluff layer c;

[0041] S4, using secondary cross-linking technology to form a mesh structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer d;

[0042] S5, connecting the bottom side of the polyurethane composite material layer a to the drug release layer b by means of heat-compression bonding, and then using a coating device to bond and fix a buffering fluff layer c to the bottom side of the drug release layer b by applying an adhesive, and then fixing the bottom side of the buffering fluff layer c to the composite support layer d by means of heat-compression bonding, and finally hot-melt bonding a polyethylene layer e to the bottom side of the composite support layer d to form an overall structure;

[0043] S6. The polyurethane composite material layer a of the overall structure is coated with an antimicrobial agent to enhance the functionality of the product.

[0044] The coating device includes a stand 1, a support 2 fastened to the top side of the stand 1, a cover frame 3 fixed to the inner side of the support 2, a pad roller 4 rotatably connected to the lower left side of the inside of the cover frame 3, so as to play a supporting and guiding role for the buffering fluff layer c entering the inside of the cover frame 3 through the pad roller 4, a conveying frame 5 arranged on the right side of the pad roller 4, a glue spraying head 6 arranged on the left side of the top side of the conveying frame 5, a roller frame 7 arranged on the right side of the top of the glue spraying head 6, and a glue scraping mechanism 8 fastened to the lower left side of the inside of the support 2, and the glue scraping mechanism 8 is provided. The pre-pressing mechanism 9 is installed on the lower right side of the cover frame 3. The pre-pressing mechanism 9 is arranged on the right side of the top of the conveying frame 5. The pre-pressing mechanism 9 can pre-press the non-woven fabric in stages and intermittently, so that the polyurethane adhesive can be evenly diffused between the two pieces of material, so as to avoid the polyurethane adhesive from overflowing or unevenly distributing due to excessive instantaneous pressure during direct rolling. The local area is initially solidified to form an anchor point for positioning, so that the subsequent rolling process is more evenly stressed and the hollowing phenomenon and wrinkle problems are reduced. The roller 10 connected to the middle and lower side of the support 2 is rotated, the frame seat 11 is fastened to the top side of the support 2, the two cylinders 12 installed on the front and rear sides of the left part of the frame seat 11, the two sliders 13 connected to the output shafts on the right sides of the two cylinders 12, the support roller 14 connected to the middle of the inner side of the two sliders 13 is rotated, the guide roller 15 set on the right side of the frame seat 11 and the guide roller 15 connected to the middle of the rear side of the guide roller 15 are rotated. The driving motor 16 and the slider 13 are slidably connected to the left side inside the frame seat 11, and 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 located on the same horizontal plane, so that the polyurethane composite material layer a and the drug release layer b are pressed and positioned after passing through the inner side 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, and the rear side of the glue spray head 6 is connected to the external polyurethane adhesive supply end so that the polyurethane adhesive can be sprayed on the buffer fluff layer c.

[0045] The scraping mechanism 8 includes a frame cover 81 fastened to the lower left side of the support 2, a servo motor 82 installed on the upper middle side of the frame cover 81, a screw 83 connected to the output end of the bottom of the servo motor 82, an internal thread block 84 threadedly connected to the outer surface of the screw 83, a reciprocating structure 85 slidably arranged on the lower middle side of 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, so that under the action of the servo motor 82, the screw 83 drives the reciprocating structure 85 in the frame cover through the cooperation with the internal thread block 84. The interior of 81 is adjusted to move longitudinally, so that the reciprocating structure 85 drives the scraper 87 to change its height position, so that the bottom of the scraper 87 is inserted into the polyurethane adhesive sprayed on the buffer fluff layer c, so as to form a groove on the polyurethane adhesive during the movement of the buffer fluff layer c, thereby reducing the generation of bubbles and improving the fitting effect. The bottom end of the screw 83 is rotatably connected to the frame cover 81, and the internal thread block 84 is set on the middle side of the top of the push frame 86, and the push frame 86 passes through and slides inside the frame cover 81 to ensure that the push frame 86 performs stable longitudinal displacement.

[0046] Among them, the reciprocating structure 85 includes a load-bearing frame 851 fastened to the push frame 86 at the top, two support blocks 852 fixedly connected to the left rear side and the middle rear side of the bottom of the load-bearing frame 851, a first motor 853 installed on the left side of the left rear support block 852, and a positioning component 854 connected to the right output end of the first motor 853. The positioning component 854 is arranged through the bottom side of the two support blocks 852, and the top of the positioning component 854 is fixed to the load-bearing frame 851, and the right side of the bottom of the positioning component 854 is fastened to the scraper 87, so that the positioning component 854 drives the scraper 87 to reciprocate in the front and rear directions through the first motor 853, thereby reciprocating in the polyurethane adhesive above the buffer fluff layer c. The grooves scraped by the scraper 87 in the polyurethane adhesive are wavy through the displacement and transportation of the buffer fluff layer c, thereby improving the bonding effect.

[0047] The positioning assembly 854 includes a rotating shaft rod 8541 whose left end is connected to the right output end of the first motor 853, an internal threaded sleeve 8542 fixed to the right end of the rotating shaft rod 8541, a first rotating piece 8543 rotatably connected to the right side of the outer surface 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 passing through and rotating on the inner side of the bottom end of the second rotating piece 8544, a threaded column 8546 passing through and rotating on the middle side of the positioning sleeve 8545, and a rotating The push rod 8547 connected to the right end of the positioning sleeve 8545, the sliding sleeve 8548 rotatably connected to the front end of the push rod 8547 and the sliding bracket 8549 arranged on the top side of the sliding sleeve 8548, the internal threaded sleeve 8542 is threadedly connected to the outer surface of the threaded column 8546, and the first motor 853 is used as a power source. The internal threaded sleeve 8542 drives the threaded column 8546 to perform a rotation 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, so that The push rod 8547 drives the sliding sleeve 8548 to perform a reciprocating displacement action on the bottom side of the sliding frame 8549, thereby driving the scraper frame 87 to achieve 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 threaded sleeve 8542, and the first rotating piece 8543 and the second rotating piece 8544 are unfolded, thereby changing the distance between the positioning sleeve 8545 and the internal threaded sleeve 8542, so as to adjust the lateral movement distance of the sliding sleeve 8548, thereby adapting to different For materials of the same width, the rotating shaft rod 8541 passes through and rotates on the bottom side of the two supporting blocks 852 to ensure the stability of the 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 scraper frame 87. The top of the sliding frame 8549 is fixed to the supporting frame 851. Sliding rods 85491 are provided on the left and right sides of the bottom of the sliding frame 8549. The left and right sides of the sliding sleeve 8548 respectively wrap 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] The pre-pressing mechanism 9 includes a stand 91 fixed to the cover frame 3 on the left side of the rear portion, a second motor 92 fastened to the top side of the rear portion of the stand 91, an eccentric wheel 93 connected to the front output end of the second motor 92, and 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 is rotated inside the rotating sleeve 931, 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 between the rotating sleeve 931 and the V-shaped piece 94, and a buffer rod 96 rotatably arranged at the lower right side of the rotating sleeve 931. The first connecting rod 96, the push sleeve 97 rotatably connected to the inner side of the bottom of the first connecting rod 96, the second connecting rod 98 rotatably arranged at the front end of the push sleeve 97, the pressure rod 99 rotatably connected to the bending part of the V-shaped piece 94, the limit seat 910 arranged on the middle side of the outer surface of the pressure rod 99 and the pressure roller 911 rotatably connected to the bottom end of the pressure rod 99, the eccentric wheel 93 is rotatably arranged on the inner upper part of the stand 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, and the eccentric wheel 93 drives During the rotation of the rotating sleeve 931, the rotating sleeve 931 can be made to reciprocate up and down. The rotating sleeve 931 drives the pressing roller 911 to move downward to contact the polyurethane composite material layer a after the pressing rod 99 moves downward through the V-shaped plate 94, and exerts downward pressure on the polyurethane composite material layer a so that the drug release layer b is intermittently pressed and fitted on the buffer villi layer c. During the pressing and fitting, as the rotating sleeve 931 moves to the lowest point, the rotating sleeve 931 drives the V-shaped plate 94 to rotate, so that the second connecting rod 98 and the first connecting rod 96 drive the push sleeve When 97 moves on the buffer rod 95, it drives the buffer rod 95 to lift upward, thereby releasing the downward pressure of the pressure rod 99 and the pressure roller 911 to avoid excessive extrusion. The left side of the limit seat 910 is fixed to the stand 91, and a limit plate 912 is set on the left side of the outer surface of the buffer rod 95 to limit the push sleeve 97 and limit 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 set on the right side of the outer surface of the buffer rod 95, and the spring 913 provides a reset force for the push sleeve 97.

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

[0050] First, the polyurethane composite material layer a and the drug release layer b after heat pressing and bonding are inserted into the inner side of the support roller 14 and the guide roller 15, and the drug release layer is located at the bottom side. Then, the right side of the polyurethane composite material layer a is brought into contact with the rotating roller 10, and then the polyurethane composite material layer a is passed out from the lower left side of the roller frame 7 to the right. Then, the buffer fluff layer c is passed from the top of the pad roller 4 through the lower side of the glue spray head 6, and then the lower side of the buffer fluff layer c is brought into contact with the conveying frame 5.

[0051] Second, according to the width of the buffer fluff layer c, the threaded column 8546 can be rotated to change the position of the threaded column 8546 inside the internal threaded sleeve 8542, and the first rotating piece 8543 and the second rotating piece 8544 can be unfolded, thereby changing the distance between the positioning sleeve 8545 and the internal threaded sleeve 8542 to adjust the travel distance of the lateral movement of the sliding sleeve 8548, and then the servo motor 82 is controlled to start, and under the action of the servo motor 82, the screw rod 83 drives the reciprocating structure 85 to move and adjust the longitudinal position 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 its height position, so that the bottom of the scraper 87 is close to the buffer fluff layer c, and the polyurethane adhesive is sprayed on the buffer fluff layer c, and the scraper 87 is inserted into the polyurethane adhesive;

[0052] Third, in the process of the polyurethane composite material layer a, the drug release layer b and the buffer villi layer c being pulled to the right, the polyurethane adhesive is sprayed on the buffer villi layer c through the glue spray head 6, and then the first motor 853 is controlled to start to rotate the shaft rod 8541, and the internal threaded sleeve 8542 drives the threaded column 8546 to perform a rotation action through the shaft rod 8541, so that the first rotating plate 8543 and the second rotating plate 8544 move together with the threaded column 8546, so that 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 then drives the scraper 87 to realize a reciprocating displacement action in the front and rear directions, and the grooves scraped by the scraper 87 in the polyurethane adhesive are wavy through the displacement and transportation of the buffer villi layer c;

[0053] Fourth, after the buffer villi layer c is coated with glue, the polyurethane composite material layer a and the drug release layer b are located above the buffer villi layer c, and the drug release layer b is close to the buffer villi layer c. During the movement of the polyurethane composite material layer a, the drug release layer b and the buffer villi layer c, the second motor 92 is controlled to start, and the eccentric wheel 93 is driven to rotate inside the rotating sleeve 931 under the action of the second motor 92, so that the rotating sleeve 931 reciprocates in the upper and lower positions. During the downward rotation movement of the rotating sleeve 931, the rotating sleeve 931 drives the pressure rod 99 to move downward through the V-shaped piece 94, and then drives the pressure roller 911 to move downward to contact the polyurethane composite material layer a, so as to apply downward pressure to the polyurethane composite material layer a. The drug release layer b is intermittently pressed and fitted on top of the buffer villi layer c. During the pressing and fitting, as the rotating sleeve 931 moves to the lowest point, the rotating sleeve 931 drives the V-shaped plate 94 to rotate, so that the second connecting rod 98 and the first connecting rod 96 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 up, releasing the downward pressure of the pressure rod 99 and the pressure roller 911 to avoid excessive squeezing, and then, as the polyurethane composite material layer a, the drug release layer b and the buffer villi layer c are moved and transported, the polyurethane composite material layer a and the drug release layer b are intermittently pre-pressed and fitted, thereby improving the fitting accuracy during subsequent full pressing.

[0054] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A super soft deformation-resistant medical nonwoven fabric, characterized by: The structure comprises a polyurethane composite material layer (a) which plays an outer protective role, a drug release layer (b) being bonded and fixed to the bottom side of the polyurethane composite material layer (a), a buffering fluff layer (c) being bonded and fixed to the bottom side of the drug release layer (b) by coating an adhesive, a composite support layer (d) being fixed to the bottom side of the buffering fluff layer (c), a polyethylene layer (e) being bonded to the bottom side of the composite support layer (d), an antibacterial agent being coated on the top side of the polyurethane composite material layer (a), the drug release layer (b) comprising a temperature and humidity sensitive polymer, microcapsules and polylactic acid, the microcapsules being combined with a healing promoting component, the temperature and humidity sensitive polymer being poly-N-isopropylacrylamide, the buffering fluff layer (c) being composited with ultrafine fibers and polyurethane elastic fibers, and the composite support layer (d) being composed of polyethylene and deformation-resistant reinforcing fibers.

2. The ultra-soft deformation-resistant medical nonwoven fabric according to claim 1, characterized in that: The microcapsules encapsulate at least one ingredient promoting healing, which is silver ions and / or plant extracts.

3. The ultra-soft deformation-resistant medical nonwoven fabric according to claim 1, characterized in that: The adhesive used between the drug release layer (b) and the buffer villi layer (c) is a polyurethane adhesive.

4. The method for preparing the ultra-soft deformation-resistant medical nonwoven fabric according to any one of claims 1 to 3, characterized in that: The preparation method is as follows: S1. Using the physical encapsulation method, the healing promoting component is mixed with polylactic acid, and microcapsules are prepared by spray drying to ensure that the microcapsule particles are uniform, have good drug loading capacity and controlled release characteristics; S2, mixing the microcapsules with the temperature and humidity sensitive polymer to form a uniform drug release layer (b), and forming it into a layer of suitable thickness using a film forming method; S3, preparing an ultrafine fiber layer by electrospinning technology, and mixing polyurethane elastic fiber to form a buffering fluff layer (c); S4, using secondary cross-linking technology to form a mesh structure of polyethylene and deformation-resistant reinforcing fibers to obtain a composite support layer (d); S5, connecting the bottom side of the polyurethane composite material layer (a) to the drug release layer (b) by means of heat-compression bonding, and then using a coating device to bond and fix a buffer fluff layer (c) on the bottom side of the drug release layer (b) by applying an adhesive, and then fixing the bottom side of the buffer fluff layer (c) to the composite support layer (d) by means of heat-compression bonding, and finally hot-melt bonding a polyethylene layer (e) on the bottom side of the composite support layer (d) to form an integral structure; S6. The polyurethane composite material layer (a) of the overall structure is coated with an antimicrobial agent to enhance the functionality of the product.

5. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 4, characterized in that: The coating equipment comprises a stand (1), a support platform (2) fastened to the top side of the stand (1), a cover frame (3) fixed to the inner side of the support platform (2), a pad roller (4) rotatably connected to the lower left side of the inside of the cover frame (3), a conveying frame (5) arranged on the right side of the pad roller (4), a glue spraying head (6) arranged on the left part of the top side 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 glue scraping mechanism (8) fastened to the lower left side of the inside of the support platform (2), a pre-pressing mechanism (9) installed on the lower right side of the inside of the cover frame (3), a rotating roller (10) rotatably connected to the middle and lower side of the inside of the support platform (2), a frame seat (11) fastened to the top side of the support platform (2), two cylinders (12) installed on the front and rear sides of the left part of the frame seat (11), a connecting rod (11) and a connecting rod (12). Two sliders (13) on the right output shafts of the two cylinders (12), a support roller (14) rotatably connected to the middle of the inner side of the two sliders (13), a guide roller (15) rotatably arranged on the right side of the inside of the frame seat (11), and a drive motor (16) connected to the middle of the rear side of the guide roller (15), the rear side of the glue spraying head (6) is connected to the external polyurethane adhesive supply end, the glue scraping mechanism (8) is arranged above the glue spraying head (6), the pre-pressing mechanism (9) is arranged on the right side of the top of the conveying frame (5), the slider (13) is slidably connected to the left side of the inside of the frame seat (11), the drive 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 located on the same horizontal plane.

6. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 5, characterized in that: The scraping mechanism (8) comprises a frame cover (81) fastened to the lower left side of the support platform (2), a servo motor (82) installed on the upper middle side of the frame cover (81), a screw (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 (83), a reciprocating structure (85) slidably arranged on the lower middle side of 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 (83) is rotatably connected to the frame cover (81), the internal thread block (84) is arranged on the middle side of the top of the push frame (86), and the push frame (86) penetrates and slides inside the frame cover (81).

7. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 6, characterized in that: The reciprocating structure (85) comprises a support frame (851) whose top is fastened to a push frame (86), two support blocks (852) fixedly connected to the left rear side and middle rear side of the bottom of the support frame (851), a first motor (853) installed on the left side of the left rear support block (852), and a positioning component (854) connected to the right output end of the first motor (853), wherein the positioning component (854) is arranged through the bottom side of the two support blocks (852), and the top of the positioning component (854) is fixed to the support frame (851), and the right side of the bottom of the positioning component (854) is fastened to the scraper frame (87).

8. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 7, characterized in that: The positioning assembly (854) comprises a rotating shaft rod (8541) whose left end is connected to the right output end of the first motor (853), an internal threaded sleeve (8542) fixed to the right end of the rotating shaft rod (8541), a first rotating plate (8543) rotatably connected to the right side of the outer surface of the rotating shaft rod (8541), a second rotating plate (8544) rotatably connected to the bottom end of the first rotating plate (8543), a positioning sleeve (8545) passing through and rotating on the inner side of the bottom end of the second rotating plate (8544), a threaded column (8546) passing through and rotating on the middle side of the interior of the positioning sleeve (8545), and a first rotating plate (8543) rotatably connected to the right side of the outer surface of the rotating shaft rod (8541). The invention relates to a push rod (8547) at the right end of the push rod (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 rotating shaft rod (8541) penetrates and rotates on the inner bottom side of the two supporting blocks (852), the first rotating piece (8543) is located on the right side of the supporting block (852), the internal threaded 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 scraper frame (87), and the top of the sliding frame (8549) is fixed to the supporting frame (851).

9. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 8, characterized in that: Sliding rods (85491) are arranged on both left and right sides of the bottom of the sliding frame (8549), and the left and right sides inside the sliding sleeve (8548) respectively wrap around and slide on the outer surfaces of the two sliding rods (85491).

10. The method for preparing the ultra-soft deformation-resistant medical non-woven fabric according to claim 5, characterized in that: The pre-pressing mechanism (9) comprises a stand (91) fixed to the cover frame (3) on the left side of the rear portion, a second motor (92) fastened to the top side of the rear portion of the stand (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 plate (94) rotatably arranged at the bottom end of the rotating sleeve (931), a buffer rod (95) rotatably connected to the connection between the rotating sleeve (931) and the V-shaped plate (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), and a first connecting rod (99) rotatably connected to the first connecting rod (99). A pressure rod (99) is provided at the bending position of the V-shaped plate (94), a limiting seat (910) is provided on the middle side of the outer surface of the pressure rod (99), and a pressure roller (911) is rotatably connected to the bottom end of the pressure rod (99); the eccentric wheel (93) is rotatably provided on the inner upper part of the vertical frame (91); the bottom end of the V-shaped plate (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 limiting seat (910) is fixed to the vertical frame (91); a limiting plate (912) is provided on the 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 provided on the right side of the outer surface of the buffer rod (95).

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