A flexible composite material, its preparation method and use for preventing needle puncture

Abstract

The present invention discloses a flexible composite material, a preparation method thereof, and an anti-puncture use. Specifically, the flexible composite material is composed of a fabric substrate and a plurality of protective conical platforms on the fabric substrate; the protective conical platforms include a conical body part located at the upper part and a soft body part located at the lower part in the direction perpendicular to the fabric substrate, and the soft body parts of all the protective conical platforms are connected into one body; each protective conical platform includes one or more air holes, the air holes penetrate through the protective conical platform and the pore channels of the air holes are non-linear. The flexible composite material prints the protective conical platforms on the fabric surface through 3D printing technology, which can effectively prevent sharp objects such as needles from passing through, so that the wearable flexible anti-puncture fabric of the present invention has a good anti-puncture effect.

Description

Technical Field

[0001] The present invention relates to the field of anti-puncture composite materials and their preparation technologies, and particularly to a flexible composite material that can be worn close to the body, its preparation method, and its use for preventing needle pricks. Background Art

[0002] Public security police officers and drug enforcement officers maintaining public order are threatened by poisonous and / or germ-infected needles in some cases when dealing with drug dealers or AIDS patients, and the gloves and textile clothing used in the market cannot meet the body's protection against needle pricks in complex and dangerous fields.

[0003] When dealing with medical waste, workers are also faced with the threat of sharp needles and broken glass contaminated with viruses and bacteria to their hands, and these sharp needles can easily penetrate ordinary work gloves.

[0004] U.S. Patent US5472769 discloses a protective clothing that can prevent penetration by sharp objects. The fiber fabric is made of aramid or high-performance glass fiber, and is composed of multiple layers connected together by methods such as stitching and thermal bonding. To improve the stab resistance, metal wires and ceramic fibers can also be added. U.S. Patent US6280546 discloses a laminated fabric with anti-shear and anti-puncture properties, which is made by bonding a thermoplastic film and a fabric containing more than 25% high-performance fibers under a certain tension. Patent WO97 / 27769 discloses a stainless steel protective insert plate, which has a low cost and flexibility, ensuring the comfort of the product. The yarn is a stainless steel complex-twisted ply structure. Patent WO97 / 49849 discloses a high-density woven aramid fabric provided by DuPont, which can protect against stabbing by sharp objects such as awls. U.S. Patent US6323145 discloses a stab-resistant fabric with an interwoven structure developed by DuPont, with a minimum strength of 706 mN / tex, a minimum elastic modulus of 13.2 N / tex, and a fracture energy higher than 10 J / g. Chinese Patent CN103668705A discloses a lightweight and comfortable stab-resistant fabric with excellent stab resistance, which is made by hybridizing ultra-high molecular weight polyethylene fibers and aramid and integrally interweaving them in a three-dimensional deep-angle online weaving structure. Chinese Patent CN101406325B discloses a soft stab-resistant vest and its production method, which is composed of three groups of stab-resistant layers laminated together. Each group of stab-resistant layers is composed of UHMWPE knitted fabric, UHMWPE fiber felt, stainless steel screen fabric, and UHMWPE fiber felt. Chinese Patent CN104738844A discloses a flexible stab-resistant glove that can be worn close to the body and its production method, using UHMWPE fibers and silk as raw materials. The silk is wrapped around the UHMWPE fibers in a spiral form to form an integrated fabric. Chinese Patent CN103340688A discloses a stab-resistant surgical glove and its manufacturing method, which is divided into three layers, including the first glove body on the outer layer, the second glove body on the inner layer, and the drug interlayer in the middle. When the glove is accidentally pierced by contaminated sharp objects such as needles, the drug in the interlayer can disinfect the pierced parts of the needles and other sharp objects, thereby reducing the risk of infection.

[0005] In the related technologies listed above, there are the following technical problems. Most of the flexible stab-resistant fabrics for military and police applications use UHMWPE fibers and other high-performance fibers as raw materials to obtain products through superposition or blending. Although daggers, sharp objects, etc. are sharp, their widths (such as the width of the knife back) or diameters at the rear are relatively large. Therefore, this product has a certain protective effect against daggers, sharp objects, etc. However, the tip and the diameter at the rear of an injection needle are both small, and this product has poor protection against injection needles. Medical stab-resistant gloves are generally made of leather, latex, or rubber gloves, with a low protection level. They can only resist the damage of general sharp objects such as iron nails, broken glass, and wooden thorns, and cannot prevent the penetration of needle-like sharp objects, and have poor air permeability.

[0006] The above statement of the background art is only for the convenience of deeply understanding the technical solution of the present invention (in terms of the technical means used, the technical problems solved, and the technical effects produced, etc.), and should not be regarded as an admission or an implication in any form that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0007] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a flexible anti-puncture composite material that can be worn close to the body. The composite material prints protective conical platforms on the fabric surface through 3D printing technology, which can effectively prevent sharp objects such as needles from passing through, so that the flexible anti-puncture fabric of the present invention has good anti-puncture effect.

[0008] In one aspect of the present invention, a flexible composite material is provided, which is composed of a fabric substrate and a plurality of protective conical platforms on the fabric substrate; the protective conical platforms include a frustum part located in the upper part and a soft part located in the lower part in the direction perpendicular to the fabric substrate, and the soft parts of all the protective conical platforms are connected into one body; each protective conical platform includes one or more air holes, the air holes penetrate through the protective conical platform and the pore channels of the air holes are non-linear. Each protective conical platform preferably includes 1, 2 or 3 air holes, more preferably 2 or 3 air holes, and most preferably 3 air holes. The diameter of each air hole is 0.001 - 1 mm, preferably 0.05 - 0.3 mm; these air holes make the flexible composite material have good air permeability, thus endowing the flexible composite material with good wearing comfort.

[0009] According to an embodiment of the present invention, in the flexible composite material, the bottom surface of the frustum part is a polygon. The polygon of the bottom surface can be an equilateral or non-equilateral polygon. In the direction perpendicular to the fabric substrate, the cross-section of the frustum part parallel to the fabric substrate gradually decreases from the bottom surface to the top end. The frustum part can be in the following forms, for example: a frustum of a pyramid or a pyramid. The top surface of the frustum of a pyramid can be parallel or non-parallel to the bottom surface; two or more superimposed segments with the same or different three-dimensional shapes, the segment located at the bottom is a frustum of a pyramid with the top surface parallel or non-parallel to the bottom surface of the frustum part, and the segment located at the top can have any three-dimensional shape, such as a cone, a frustum of a cone, a pyramid, a frustum of a pyramid, and other three-dimensions with the top surface having any shape (for example, the top surface can be parallel or non-parallel to the bottom surface of the frustum part and can be, for example, a plane (which can have an equilateral or non-equilateral polygon, a circle or any other arbitrary shape), a concave surface, a convex surface or a concave-convex surface).

[0010] According to an embodiment of the present invention, in the flexible composite material, the polygon on the bottom surface of the conical part is a triangle, a quadrilateral, a pentagon, a hexagon, an octagon, or a combination thereof, preferably a triangle, a hexagon, or a combination thereof.

[0011] According to an embodiment of the present invention, in the flexible composite material, the side length of the bottom surface of the conical part is 2 - 10 mm, preferably 3 - 5 mm. When the top of the conical part is a polygonal plane, the side length of the polygon is 1 - 5 mm.

[0012] According to an embodiment of the present invention, in the flexible composite material, each protective conical platform includes a vertical air hole in the middle and inclined air holes on both sides in the direction parallel to the fabric substrate. The diameter of each air hole is 0.001 - 1 mm, preferably 0.05 - 0.3 mm.

[0013] According to an embodiment of the present invention, in the flexible composite material, in the direction perpendicular to the fabric substrate, the thickness of the soft part is 0.5 - 3 mm, preferably 1 - 3 mm, and the height of the conical part is 0.5 - 3 mm, preferably 1 - 3 mm.

[0014] According to an embodiment of the present invention, in the flexible composite material, the soft part is composed of a soft resin, and the conical part is composed of the same or different soft resins as the soft part, or a hard material.

[0015] According to an embodiment of the present invention, in the flexible composite material, the soft part is composed of a soft resin containing a reinforcing substance, and the conical part is composed of a soft resin containing a reinforcing substance, or a hard material. The reinforcing substance is selected from one or more of ceramic powder, diamond powder, glass microspheres, graphene sheets, and mica flakes, and its content is 10% - 50% of the weight of the soft resin of the soft part or the conical part, preferably 10% - 15%. These reinforcing substances play a reinforcing role, thereby improving the anti - puncture performance.

[0016] According to an embodiment of the present invention, in the flexible composite material, the soft resin is selected from one or more of acrylonitrile - butadiene - styrene copolymer, polycaprolactone, polyamide, polylactic acid, elastic acrylate - based photosensitive resin, elastic or flexible polyurethane, silicone rubber, and Tango rubber, preferably one or more of flexible polyurethane, silicone rubber, and Tango rubber; the hard material is selected from one or more of rigid polyurethane, ABS resin, PC plastic, alumina ceramic, titanium carbide ceramic, and magnesium - aluminum alloy, preferably one or more of rigid polyurethane, ABS resin, and PC plastic.

[0017] In another aspect of the present invention, there is provided a method for preparing a flexible composite material. The preparation method prints a plurality of protective conical platforms on a fabric substrate by 3D printing technology. Among them, the protective conical platform includes a conical body part located in the upper part and a soft body part located in the lower part in the direction perpendicular to the fabric substrate, and the soft body parts located in the lower part of all the protective conical platforms are connected to each other; a non-linear metal wire or water-soluble material that penetrates the protective conical platform and can be removed is preset in each protective conical platform. After the printing is completed, the preset metal wire is drawn out or the water-soluble substances contained in the water-soluble material are removed by water dissolution, so as to form air holes in each protective conical platform.

[0018] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the water-soluble substance is selected from one or more of starch, highly substituted or lowly substituted 2-hydroxypropyl ether cellulose, cellulose ethyl ether, methyl cellulose, sodium carboxymethyl cellulose, polyacrylamide, polyvinylpyrrolidone, sodium p-toluenesulfonate, soluble inorganic salts, etc., preferably one or more of starch, sodium carboxymethyl cellulose, and sodium p-toluenesulfonate.

[0019] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the flexible composite material is composed of a fabric substrate and a plurality of protective conical platforms on the fabric substrate; the protective conical platform includes a conical body part located in the upper part and a soft body part located in the lower part in the direction perpendicular to the fabric substrate, and the soft body parts of all the protective conical platforms are connected into one body; each protective conical platform includes one or more air holes, the air holes penetrate the protective conical platform and the pore channels of the air holes are non-linear. Each protective conical platform preferably includes 1, 2, or 3 air holes, more preferably 2 or 3 air holes, and most preferably 3 air holes. The diameter of each air hole is 0.001-1 mm, preferably 0.05-0.3 mm.

[0020] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the bottom surface of the conical part is a polygon. The polygon of the bottom surface can be an equilateral or non-equilateral polygon. In the direction perpendicular to the fabric substrate, the cross-section of the conical part parallel to the fabric substrate gradually decreases from the bottom surface to the top end. The conical part can be in the following forms: a frustum of a pyramid or a pyramid. The top surface of the frustum of a pyramid can be parallel or non-parallel to the bottom surface; two or more superimposed segments with the same or different three-dimensional shapes. The segment located at the bottom is a frustum of a pyramid with the upper surface parallel or non-parallel to the bottom surface of the conical part. The segment located at the top can have any three-dimensional shape, such as a cone, a frustum of a cone, a pyramid, a frustum of a pyramid, and other three-dimensional shapes with the top surface having any shape (for example, the top surface can be parallel or non-parallel to the bottom surface of the conical part and can be, for example, a plane (which can have an equilateral or non-equilateral polygon, a circle, or any other arbitrary shape), a concave surface, a convex surface, or a concave-convex surface).

[0021] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the polygon of the bottom surface of the conical part is a triangle, a quadrilateral, a pentagon, a hexagon, an octagon, or a combination thereof, preferably a triangle, a hexagon, or a combination thereof.

[0022] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the side length of the bottom surface of the conical part is 2 to 10 mm, preferably 3 to 5 mm. When the top end of the conical part is a polygon plane, the side length of the polygon is 1 to 5 mm.

[0023] According to an embodiment of the present invention, in the method for preparing a flexible composite material, each protective conical platform includes a vertical air hole in the middle and inclined air holes on both sides in the direction parallel to the fabric substrate. The diameter of each air hole is 0.001 to 1 mm, preferably 0.05 to 0.3 mm.

[0024] According to an embodiment of the present invention, in the method for preparing a flexible composite material, in the direction perpendicular to the fabric substrate, the thickness of the soft part is 0.5 to 3 mm, preferably 1 to 3 mm, and the height of the conical part is 0.5 to 3 mm, preferably 1 to 3 mm.

[0025] According to an embodiment of the present invention, in the method for preparing a flexible composite material, the soft part is composed of a soft resin, and the conical part is composed of the same or different soft resins as the soft part, or a hard material.

[0026] According to one embodiment of the present invention, in the preparation method of the flexible composite material, the soft part is composed of a soft resin containing a reinforcing substance, and the conical part is composed of a soft resin containing a reinforcing substance, or a hard material, and the reinforcing substance is selected from one or more of ceramic powder, diamond powder, glass microbeads, graphene sheets, and mica sheets and its content is 10% to 50% by weight of the soft resin of the soft part or the conical part, preferably 10 to 15%.

[0027] According to one embodiment of the present invention, in the preparation method of the flexible composite material, the soft resin is selected from one or more of acrylonitrile-butadiene-styrene copolymer, polycaprolactone, polyamide, polylactic acid, acrylic photosensitive resin, elastic or flexible polyurethane, silicone rubber, Tango rubber, preferably one or more of flexible polyurethane, silicone rubber, Tango rubber; the hard material is selected from one or more of hard polyurethane, ABS resin, PC plastic, alumina ceramics, titanium carbide ceramics, magnesium-aluminum alloy, preferably one or more of hard polyurethane, ABS resin, PC plastic.

[0028] In another aspect of the present invention, a flexible composite material is provided for use in needle puncture prevention. A flexible needle puncture prevention composite material is a protective cone-shaped platform printed on a fabric substrate by 3D printing technology. The bottom of the protective cone-shaped platform is interconnected and has a certain thickness, which can prevent needle puncture to a certain extent; non-vertical metal wires that can be withdrawn or substances that can be removed by water dissolution are pre-set in the middle part and both sides of the protective cone-shaped platform. After the finished product, the pre-set metal wires or intermediate substances that can be removed by water dissolution are taken out, thereby forming pores with very small diameters inside the protective cone-shaped platform. The aspect ratio of the pores is very large (for example, 3 to 3000, preferably 10 to 60). The external needle piercing the pore will be blocked by the inner wall and is not easy to penetrate, and the special-shaped cross-section of the protective cone-shaped platform increases the friction when grasping objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings, which constitute a part of this application but do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 A schematic structural diagram of a protective conical platform in a 3D-printed flexible anti-needle puncture composite material provided according to one embodiment of the present invention, wherein 1 represents the 3D-printed protective conical platform, and 2 represents the soft part located at the bottom of the protective conical platform.

[0031] Figure 2Schematic diagram of a triangular protective conical platform of a 3D-printed flexible stab-resistant composite material provided according to an embodiment of the present invention. Among them, 3 represents the conical part located at the upper part of the protective conical platform, and 4 represents the needle tip stabbing the flexible stab-resistant composite material.

[0032] Figure 3 Schematic diagram of air holes pre-embedded with metal wires in the middle and on both sides of the protective conical platform in a 3D-printed flexible stab-resistant composite material provided according to an embodiment of the present invention. Among them, 5 represents the air holes pre-embedded with metal wires.

[0033] Figure 4 Schematic diagram of air holes pre-embedded with water-soluble substances that can be removed by water dissolution in the middle and on both sides of the protective conical platform in a 3D-printed flexible stab-resistant composite material provided according to an embodiment of the present invention. Among them, 6 represents the air holes pre-embedded with water-soluble substances. Detailed implementation manners

[0034] The present invention will be further described below through specific implementation manners. It is necessary to point out here that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. Without departing from the principles and spirit of the present invention, those skilled in the art make some improvements and adjustments based on the above-mentioned invention content, which still fall within the protection scope of the present invention.

[0035] Example 1

[0036] (1) Select PA2200 (EOS GmbH, Germany) material as the conical part (3) of the protective conical platform (1), and liquid silicone SILASTIC TM 3D 3335 LSR (Dow Corning Corporation) as the lower soft part (2) of the protective conical platform.

[0037] (2) Through the FDM fused deposition modeling 3D printing technology, control the temperature of the heating die head to heat PA2200 and silicone SILASTIC TM 3D 3335 LSR to the critical state respectively to make them present a semi-fluid state, at 150 g / m 2The surface heating die head of the nylon Oxford cloth will move along the set regular triangular pyramid trajectory under software control. At the same time, the nozzle extrudes the semi-fluid material, controls the forming temperature, and after one layer is formed, the machine workbench rises by a height (i.e., the layer thickness) and then forms the next layer until the conical platform is completed. And copper wires with a diameter of 0.2 mm are preset vertically and obliquely on both sides in the middle of the protective conical platform. After completion, the copper wires are drawn out to form a non-linear pore (5) structure with a diameter of 0.2 mm. The length of the lower bottom edge of the triangular pyramid part (3) is 3 mm, the thickness of the lower soft part (2) of the protective conical platform is 1 mm, the height of the upper conical part (3) is 1 mm, and the side length of the top surface of the conical part (3) is 1.5 mm. The lower soft parts (2) of the protective conical platform are connected together to form a soft anti-puncture composite material with good air permeability.

[0038] Example 2

[0039] (1) Select Tango rubber-like material (a special 3D printing material of Objet Company, Israel) as the 3D printing material for the protective conical platform (1).

[0040] (2) Through the Polyjet fused deposition 3D printing technology, the Tango rubber-like material is put into the material container and heated and melted. During the printing process, the pen holder moves along the square graphic trajectory set by the computer on the building platform. As it moves, the printing nozzle selectively sprays the Tango rubber-like material in the form of droplets onto the surface of the polyester cotton cloth with a weight of 120 g / m 2 and quickly solidifies into a growing solid. After a single layer is completed, the building platform moves down by one layer in height, and this process is repeated until the protective conical platform is completed. And a sodium carboxymethyl cellulose / Tango rubber material (mass ratio 80 / 20) columnar structure with a diameter of 0.5 mm is preset vertically and obliquely on both sides in the middle of the protective conical platform. After completion, the sodium carboxymethyl cellulose is removed by washing with water to form a "sea-island"-like pore (6) structure. The length of the lower bottom edge of the quadrilateral pyramid part (3) is 4 mm, the thickness of the lower soft part (2) of the protective conical platform is 1.5 mm, the height of the upper conical part (3) is 1.5 mm, and the side length of the top surface of the conical part (3) is 2.5 mm. The lower soft parts (2) of the protective conical platform are connected together to form a soft anti-puncture composite material with good air permeability.

[0041] The above-mentioned "sea-island"-like pores refer to pipelines with a certain pore diameter formed by mixing soluble substances and 3D printing materials. When washed with water, the soluble substances are dissolved out, and the remaining 3D printing materials in the pipelines will adhere to the pipelines in the form of particles or local blocks to form ventilation pipelines.

[0042] Example 3

[0043] (1) Select photosensitive resin (acrylate, DSM Somos lmagine 8000) as the 3D printing material for the protective frustum (1).

[0044] (2) Through the Polyjet fused deposition 3D printing technology, put the DSM Somos lmagine 8000 material into the material container and heat it to melt. During the printing process, the pen holder moves along the hexagonal graphic trajectory set by the computer on the building platform. As it moves, the printing nozzle selectively sprays the DSM Somos lmagine 8000 material in the form of droplets onto the surface of the 200 g / m2 nylon Oxford cloth on the building platform. After spraying, ultraviolet rays immediately cure them into an increasing solidified body. After a single layer is completed, the building platform moves down one layer in height, and repeat this process until the protective frustum is completed; and preset columnar structures of sodium p-toluenesulfonate / DSM Somos lmagine 8000 (mass ratio 90 / 10) with a diameter of 0.3 mm vertically in the middle and obliquely on both sides of the protective frustum; after completion, remove sodium p-toluenesulfonate by washing with water to form a "sea-island" type pore (6) structure. The length of the lower bottom edge of the hexagonal cone part (3) is 5 mm, the thickness of the lower soft part (2) of the protective frustum is 2 mm, the height of the upper cone part (3) is 2 mm, and the side length of the top surface of the cone part (3) is 3 mm. The lower soft parts (2) of the protective frustum are connected together to form a soft puncture-proof composite material with good air permeability.

[0045] Experimental test examples

[0046] The puncture-proof test of the puncture-proof composite material can be carried out according to the standard test method ASTM F2878-2010 for the puncture resistance of protective clothing materials to injection needles, or the steel needle in the test method of GB24541-2009 for hand protection mechanical hazard protection gloves can be replaced with a syringe needle or a needle of corresponding size. In this case, it is carried out according to the standard test method ASTM F2878-2010 for the puncture resistance of protective clothing materials to injection needles.

[0047] The test method for air permeability is carried out according to GB / T10655-2003 Determination of Air Permeability of Porous Elastic Materials of Polymers.

[0048] After actual detection, the puncture-proof performance and air permeability results of the puncture-proof composite materials in Examples 1-3 are as follows.

[0049]

Claims

1. A flexible composite material, characterized in that, The flexible composite material is composed of a fabric substrate and a plurality of protective conical platforms on the fabric substrate; The protective conical platforms include a conical body part at the upper part and a soft body part at the lower part in the direction perpendicular to the fabric substrate, and the soft body parts of all the protective conical platforms are connected into one body; Each protective conical platform includes a plurality of air holes, the air holes penetrate through the protective conical platform and the pore channels of the air holes are non-linear, and a needle from the outside penetrating into the air holes will be blocked by the inner wall and is not easy to penetrate; each protective conical platform includes a vertical air hole in the middle and inclined air holes on both sides in the direction parallel to the fabric substrate, and the diameter of each air hole is 0.001 - 1 mm; In the direction perpendicular to the fabric substrate, the cross-section parallel to the fabric substrate of the conical body part gradually decreases from the bottom surface to the top end; In the direction perpendicular to the fabric substrate, the thickness of the soft body part is 0.5 - 3 mm, and the height of the conical body part is 0.5 - 3 mm.

2. The flexible composite material according to claim 1, wherein The bottom surface of the conical body part is a polygon.

3. The flexible composite material according to claim 2, characterized in that, The polygon of the bottom surface of the conical body part is a triangle, a quadrilateral, a pentagon, a hexagon, an octagon, or a combination thereof.

4. The flexible composite material according to claim 1, characterized in that The side length of the bottom surface of the conical body part is 2 - 10 mm.

5. The flexible composite material according to claim 1, wherein, The soft body part is composed of a soft resin, and the conical body part is composed of the same or different soft resins as the soft body part, or a hard material.

6. The flexible composite material according to claim 1, characterized in that, The soft body part is composed of a soft resin containing a reinforcing substance, and the conical body part is composed of a soft resin containing a reinforcing substance, or a hard material. The reinforcing substance is selected from one or more of ceramic powder, diamond powder, glass microspheres, graphene sheets, mica flakes, and its content is 10% - 50% of the weight of the soft resin of the soft body part or the conical body part.

7. The flexible composite material according to claim 5 or 6, characterized in that The soft resin is selected from one or more of acrylonitrile - butadiene - styrene copolymer, polycaprolactone, polyamide, polylactic acid, elastic acrylate - based photosensitive resin, elastic or flexible polyurethane, silicone rubber, Tango rubber; the hard material is selected from one or more of rigid polyurethane, ABS resin, PC plastic, alumina ceramic, titanium carbide ceramic, magnesium aluminum alloy.

8. A method for preparing the flexible composite material according to any one of claims 1 to 7, characterized in that, A plurality of protective conical platforms are printed on the fabric substrate by 3D printing technology. Among them, the protective conical platforms include a conical body part at the upper part and a soft body part at the lower part in the direction perpendicular to the fabric substrate, and the soft body parts at the lower parts of all the protective conical platforms are connected to each other; a non-linear metal wire or water-soluble material that penetrates through the protective conical platform and can be removed is preset in each protective conical platform, and after the printing is completed, the preset metal wire is drawn out or the water-soluble substance contained in the water-soluble material is removed by water solubility, so as to form air holes in each protective conical platform.

9. The method according to claim 8, wherein The water-soluble substance is selected from one or more of starch, high-substituted or low-substituted 2-hydroxypropyl ether cellulose, cellulose ethyl ether, methyl cellulose, sodium carboxymethyl cellulose, polyacrylamide, polyvinylpyrrolidone, sodium p-toluenesulfonate, soluble inorganic salts.

10. Use of the flexible composite material according to any one of claims 1 to 7 for preventing needle pricks.

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