52 results about "Silk fiber" patented technology

This invention relates to a method for preparing polyacrylonitrile-based high-performance carbon fiber precursor, mainly addressing the problems of high fiber fineness CV value, low strength, and high strength CV value in existing carbon fiber precursors. This invention employs a wet spinning process, using curved rollers in the drying and densification stage. Simultaneously, at 350–450 kPa, the relationship between steam drawing tension and steam drawing ratio satisfies a linear relationship: y = Ax - 50.6 (400 ≤ A ≤ 800, 1 ≤ x ≤ 5). Wherein, y is the steam drawing tension, and x is the steam drawing ratio. The technical solution adopted in this invention effectively solves the problems of high fiber fineness CV value, low strength, and high strength CV value in carbon fiber precursors, and can be used in the industrial production of polyacrylonitrile-based high-performance carbon fiber precursors.

This application relates to the field of webbing, and discloses a silk webbing. A silk webbing is woven and heat-set from a blended yarn containing silk fibers. The blended yarn is made from 55-60 wt% pretreated silk fibers, 18-23 wt% spandex fibers, and 19-24 wt% nylon fibers. The pretreated silk fibers are obtained by sequentially soaking, enzymatically hydrolyzing, fluffing, and drying the silk fibers. This application, through pretreatment of the silk fibers, produces a silk webbing with good breathability, softness, and shape retention. When used in underwear shoulder straps, it is less prone to deformation and shrinkage after long-term wear and washing, and it is less likely to cause sweating and skin irritation, thus improving comfort in contact with the skin.

A composite textile can include one or more nonwoven fiber webs (e.g., with staple fibers) joined to one or more functional layers (e.g., nonwoven layer with elastomeric continuous filament fibers). In at least some examples, the layers are joined by fiber plugs, which include bundles of staple-fiber portions extending through (and frictionally retained within) openings (e.g., needle-penetration openings) within the composite textile. In addition, the fiber plugs can have varied properties that are collectively optimized to impart desired properties (e.g., stretch properties) to the composite textile. For example, the fiber plugs can include different numbers of fibers and can be anchored at different depths within the composite textile.

This invention discloses a pure edible fungus mycelial fiber material, its preparation method, and its applications. The preparation method includes the following steps: S1, fungal activation; S2, liquid static film formation; S3, semi-solid thickening; S4, solid cultivation and environmental induction for densification and solidification: the thickened mycelial layer is peeled off and transferred to a solid cultivation environment containing a support carrier, inducing the mycelium to densify and solidify, obtaining a pure mycelial fiber dense layer; S5, peeling and post-treatment; S6, hot pressing to obtain the pure edible fungus mycelial fiber material. This invention completely eliminates the limitations of agricultural waste substrates on material performance. The obtained pure mycelial material has a complete mycelial skin morphology, high density, and certain tensile strength, and can be used to prepare imitation leather materials, decorative finishes, etc., possessing high application value.

This invention relates to the field of functional textile fabric technology, specifically to a silk blended skin-friendly fabric with intelligent humidity regulation function and its weaving method, comprising: an inner layer formed of highly moisture-wicking and low-absorption swelling synthetic fibers, wherein the skin-contact surface of the inner layer has a honeycomb-shaped raised dot structure, the raised dot structure consisting of raised parts and grooved parts, the raised parts forming point contact with the skin, and the grooved parts forming moisture-wicking channels; an outer layer formed of a blend of silk fibers and highly absorbent fibers, wherein the outer layer is a combination of plain weave and satin weave, the plain weave area and the satin weave area being alternately distributed; the inner layer and the outer layer are connected by joints to form a double-layer structure; by controlling the degumming rate of the silk at 18%-22%, the moisture absorption and swelling rate of the silk fibers is reduced from the conventional 10%-15% to 6%-8%, which retains the luster and hand feel of the silk while appropriately reducing the swelling range. The addition of alginate fibers significantly enhances the moisture storage capacity of the outer layer.

The present application relates to a kind of judging methods of degumming state of silk, belong to silk fibroin production technical field, the degumming is to cut dry cocoon and put into degumming system and carry out degumming, by obtaining the first degumming liquid data and first silk data in the first degumming stage, obtain the second degumming liquid data in the second degumming stage, derive degumming liquid data change value, obtain second silk data based on degumming change value and first silk data, further judge the degumming state of silk, can only be determined by the conductivity of degumming solution and ultraviolet absorption peak value on-line judge degumming process corresponding degumming point silk fibroin degumming rate and silk fibroin molecular weight, can be used to monitor degumming progress, to control process to accurately control the molecular weight of silk fibroin, and suitable for alkaline degumming system and enzyme degumming system, provide universal judging standard, in the regulation silk fibroin molecular weight, cocoon raw material selection degumming process, screening cocoon raw material has important research significance and application value.

This utility model discloses an organic silk fiber soaking treatment device, relating to the field of silk processing technology. It includes a soaking tank, which comprises a tank body serving as the main container for the soaking operation. The tank body holds the soaking solution and provides soaking space for the silk to be soaked. Support legs are installed at the bottom of the tank body to support it and maintain a stable height. When the absorbed silk needs to be retrieved, the drain pipe is first opened, and then the motor is started. The motor drives a first gear, a second gear, and a lead screw to rotate via a shaft. The rotation of the lead screw causes a support block to rise, which in turn raises a connecting plate. The connecting plate then raises the frame and the silk, allowing water to gradually flow out from the permeable holes on the frame. This device can directly retrieve the absorbed silk and control its moisture content, reducing the difficulty of subsequent handling.

The utility model discloses a kind of ventilated porous composite sponge pad, it is related to sponge pad technical field, including pad body and the heat dissipation cavity being set on it, pad body top and bottom two ends are respectively adhered and fixed with solid surface layer, pad body top is communicated with pad body periphery by heat dissipation cavity;It also includes the bamboo charcoal fiber filling layer in heat dissipation cavity;Solid surface layer is breathable, and solid surface layer is ice silk fiber layer;The utility model has the advantages that: after bamboo charcoal fiber filling layer is inserted into heat dissipation cavity, certain support can be provided to increase the stability of heat dissipation cavity when being pressed, to strengthen the ventilation and heat dissipation property;Bamboo charcoal fiber filling layer can also provide moisture absorption and perspiration function and itself has certain thermal conductivity, can promote the diffusion and emission of heat;Solid surface layer is as surface layer and uses ice silk fiber layer or flax fiber layer, can provide thermal conductivity to transfer heat to bamboo charcoal fiber filling layer, and itself has good moisture absorption and perspiration performance, can improve the cool feeling.

The application provides a silk fabric sensor and application thereof in gesture recognition, and belongs to the technical field of flexible electronics and wearable sensing. X MXene nanosheets are functional fillers, and Ti X MXene nanosheets are loaded on the surface of silk fibers through an immersion coating process to form a core-shell structure conductive fabric, and Ti X MXene and silk fibroin are stably combined through a hydrogen bond network and electrostatic interaction, the water vapor transmission rate of the sensor is more than 2000 g / m²・day, the sensitivity coefficient GF in the low strain region of 0-18% is 149.31, and the sensitivity coefficient GF in the high strain region of 18-32% is 24.57. X MXene nanosheets are functional fillers, and stable combination of MXene and silk fibers is realized through optimization of a preparation process, so that the application has high sensitivity, good air permeability and excellent fatigue resistance, and a high-precision and low-delay gesture recognition and human-computer interaction system is constructed.

The application relates to the technical field of fabric support, in particular to a wrinkle-preventing silk fabric suspension type shaping support structure, which comprises a suspension support, a top plate, a cloth winding shaft, an auxiliary beating assembly and a wrinkle-removing positioning assembly, the top plate is fixedly connected at the top of the suspension support, and the wrinkle-removing positioning assembly is installed at the side of the suspension support close to the auxiliary beating assembly. The wrinkle-preventing silk fabric suspension type shaping support structure of the application simulates the natural unfolding effect of manual beating through low-frequency vibration of the auxiliary beating assembly, and avoids the damage of high temperature or chemical treatment to silk fibers. The cloth winding shaft symmetrically winds large-size silk fabrics, so that the fabrics are uniformly stressed in a suspension state, and folding marks are completely eliminated, and meanwhile, the transverse occupied space is saved; the fabric is gently pressed against the fabric edge by rotating the handle to drive the threaded rod, so that the vertical direction of the fabric is maintained, and oblique distortion wrinkles are avoided; the limiting block ensures that the fabric does not displace during beating, and the wrinkle-removing efficiency is improved.

This application belongs to the technical field of oiling devices and discloses an oiling device for polyester filament fiber spinning. It includes an oiling tank, with threading holes on both sides of the tank. The inner bottom wall of each of the two sets of threading holes has a first arc groove. Multiple guide rollers are rotatably mounted on the inner wall of one side of the oiling tank, and multiple guide grooves are provided on their side walls. The number of first arc grooves is equal to the number of guide grooves, and their positions correspond one-to-one. A blocking component is provided in each of the two sets of threading holes. The oiling tank contains an oiling mechanism and an automatic threading mechanism. This application, by setting an automatic threading mechanism, achieves the purpose of automatic threading of polyester filaments, eliminating the cumbersome operation of manually threading multiple polyester filaments through the tank and into the annular grooves on the first and second guide rollers, thus improving the oiling efficiency of polyester filaments.

The present invention relates to a method for texturizing a yarn or yarn bundle comprising shrinkable silk polypeptide fibre. Further, the present invention relates to a texturized yarn or yarn bundle obtained by the method. Furthermore, the present invention relates to the use of the texturized yarn or yarn bundle in the textile industry.

The utility model discloses a self -adaptation knitted fabric structure of can automatic regulation tightness, including knitted fabric body, knitted fabric body is equipped with a plurality of weft knitting unit connected in proper order, and weft knitting unit includes a plurality of knitting lines, and knitting line adopts rib weave and is woven to form a plurality of rows of loops, and a plurality of rows of loops are provided with high elasticity yarn, and high elasticity yarn forms the arc structure of not closing on the loop, and high elasticity yarn is on the rest loop and is in the state of floating line. The utility model avoids that knitted fabric body is opened and is deformed by external force thoroughly through the tubular elastic bandage of knitted fabric body middle section suture, and the knitting line of knitted fabric body weft knitting unit adopts rib weave, and the knitting line is made of elastic fiber, so that knitted fabric body has good elasticity, and the tightness can be adjusted, and the loop is provided with high elasticity yarn, and the high elasticity yarn is made of spandex fiber and silk fiber, has higher elastic elongation and quick recovery ability, and is suitable for medical gasket popularization and use.

The objective is to develop a cellulose-based fiber that allows spore-forming bacteria to express their function more readily than the antibacterial rayon fiber containing spore-forming bacteria described in Japanese Patent Publication No. 7323742. Furthermore, the objective is to develop a new manufacturing method that does not expose spore-forming bacteria to harsh environments during the manufacturing process. [Solution] An antimicrobial cellulose fiber containing spore-forming bacteria, having a colony occupancy rate of 50% or more in a predetermined culture test. Furthermore, a method for producing an antimicrobial cellulose fiber containing spore-forming bacteria, comprising the step of mixing a cellulose fiber surface-treated with a dilute strong alkaline aqueous solution with spore-forming bacteria.

The application belongs to the technical field of geotextile production, and particularly relates to a cold-proof composite geotextile and a preparation method thereof, which comprises the following raw materials in parts by weight: polyethylene 50-60 parts, ethylene-vinyl acetate copolymer 20-30 parts, modified composite fiber 30-50 parts, modified flaky calcium carbonate 4-10 parts, and submicron inorganic whisker fiber 3-5 parts; the modified composite fiber is prepared from modified pre-oxidized fiber, basalt fiber and nano aerogel. By adding functional modified composite fiber in the polyethylene-vinyl acetate copolymer fiber, the reinforcing and anti-aging effects of the added submicron inorganic whisker fiber and the wear-resistant and pressure-resistant performance of the modified flaky calcium carbonate are combined, so that the overall mechanical strength and service life of the geotextile are significantly improved, the product has excellent flame retardance, temperature resistance, structural stability and durability in a low-temperature environment, and can meet the long-term performance requirements of engineering in different extreme environments.

This invention relates to a synthetic fiber extraction method, belonging to the field of synthetic fiber technology, to address the problems of radial and axial movement of fiber rolls, leading to tension fluctuations and trajectory deviations in the fiber bundle, reducing fiber bundle strength; continuous oscillation of the fiber bundle during extraction causing tension fluctuations; and the tendency of raw fiber bundles to twist. The synthetic fiber extraction method of this invention includes the following steps: Step A: Loading the fiber roll; Step B: Threading the fiber bundle; Step C: Removing the fiber roll; Step D: Ending the synthetic fiber extraction. This invention utilizes a follow-up unit to monitor and compensate for tension changes in the fiber bundle in real time, reducing tension fluctuations during extraction; and uses a threaded adjustment mechanism to move a pressure adjustment component along the length of the oscillation strip, changing the downward pressure of the second rotating wheel, thereby achieving pressure control to adapt to tension fluctuations in fiber bundles of different specifications.

This invention discloses a down-proof, flame-retardant, and heat-insulating sandwich structure and manufacturing method for down products, including a five-layer and a seven-layer type: the five-layer type consists of, from the inside out, a chemical fiber or silk fiber cloth, a glass fiber cloth, a basalt or ceramic fiber cloth, a down filling layer, and then the above three layers are symmetrically composited; the seven-layer type, based on the five-layer type, adds a natural flame-retardant and static-free cotton and linen fiber cloth on the innermost outermost layer, achieving electrical insulation and double fire resistance. An electrostatic field is formed by the friction between the chemical fiber / silk cloth and the inorganic fiber cloth, causing the down to be adsorbed in the middle and blocked by like-particle repulsion, effectively preventing down leakage; simultaneously, the inorganic fire resistance of glass fiber, basalt, or ceramic fiber and the natural flame retardancy of cotton and linen are used to construct a fire barrier. The manufacturing method includes the preparation of the triboelectric layer, sandwich assembly, and pressing fixation, using sewing or hot pressing processes to ensure that the electrostatic and flame-retardant properties are not compromised. This structure combines down leakage prevention, flame retardancy, warmth, and comfort, and the process is simple, making it suitable for various down products.

A high-quality antifungal and antibacterial mulberry silk, its preparation method, and its application. This invention belongs to the field of functional modification of natural polymer fiber materials. The purpose of this invention is to solve the technical problem that existing mulberry silk modification methods cannot simultaneously achieve both mulberry silk quality and antifungal and antibacterial effects. The method of this invention is as follows: First, the mulberry silk undergoes a mild degumming pretreatment; then, methacryloyl chloride is used to selectively acylate the active amino groups on the side chains of silk fibroin to activate the fiber; based on this, the antibacterial monomer is subjected to a free radical graft copolymerization reaction with the double bonds already anchored on the fiber under the action of an initiator, and finally a polyquaternary ammonium salt antifungal and antibacterial functional layer firmly bound by covalent bonds is formed on the surface of each silk fiber. The active components of this functional layer will never be lost through physical washing or friction, thus endowing the mulberry silk with intrinsic antifungal ability as long as its own lifespan.

The application relates to a spinning fiber and a preparation method thereof. The spinning fiber is prepared from raw materials including polyvinyl alcohol and chitosan in a mass ratio of (6-8):(2-4) through solution jet spinning of a mixed crosslinked product of the raw materials. The application provides a spinning fiber which is prepared from a mixed and crosslinked product of chitosan and polyvinyl alcohol in a specific mass ratio through solution jet spinning. The polyvinyl alcohol has better hydrophilicity than the chitosan, and the chitosan has a network structure after interpenetration and crosslinking with the polyvinyl alcohol, so that the hydrophilicity of the chitosan is improved, the swelling degree is increased, the hemostatic effect is better, the effusion of a wound can be effectively absorbed, the wound can be dried, and bacterial reproduction can be prevented.

This invention discloses a spinning fiber raw material conveying device and its usage method, relating to the field of spinning fiber raw material conveying technology. It includes a horizontal conveyor, a screw conveyor positioned above the horizontal conveyor in the middle, a track assembly fixedly connected to the top of the horizontal conveyor and located below the screw conveyor, a material tray positioned above the track assembly, and an elastic telescopic rod fixedly connected to the bottom of the material tray. The track assembly carries and guides the movement of the material tray, and the material tray receives the raw material conveyed by the screw conveyor. The elastic telescopic rod passes through the track assembly and is inserted into the horizontal conveyor. A vibration component is positioned between the material tray and the track assembly, and the vibration component drives the material tray moving along the track assembly to vibrate. This invention not only achieves uniform distribution during the conveying of semi-fluid raw materials, avoiding the inconvenience of manual vibration, but also prevents uneven distribution of raw materials.

The application discloses a kind of high-efficiency production methods of industrial filter fabric, select silk fiber as raw material, and successively include degumming, bleaching reduction, wetting and refining to obtain neat and clean dry cotton;Again successively through cotton distribution, open cotton, cut cotton to obtain stick cotton suitable for carding processing;Stick cotton is obtained by high-efficiency carding machine, and the silk spinning high-efficiency carding machine including continuous feeding device, holding carding device, free carding device is used, the two ends of the silk fiber after cutting of continuous feeding are respectively held and carded, and the carding effect is improved, the comprehensive quality of yarn is improved, especially the strength and elongation of yarn, so as to realize the high-efficiency production of industrial filter fabric with high strength and wear resistance, excellent dimensional stability and smooth surface characteristics.

The utility model discloses a kind of machine washable real silk fabrics, including by surface layer warp yarn and surface layer weft yarn interwoven surface layer fabric, by inner layer warp yarn and inner layer weft yarn interwoven inner layer fabric, surface layer fabric and inner layer fabric are connected by connecting warp yarn;The surface layer warp yarn and surface layer weft yarn include first yarn, and inner layer warp yarn and inner layer weft yarn all include m root: the first yarn and second yarn of m root arrangement;First yarn includes mutually twisted real silk yarn and triacetate fiber yarn, and second yarn includes mutually twisted real silk yarn and chinlon filament;M is the minimum weft yarn cycle number;Twist of triacetate fiber yarn is 1000-1200 twist per meter;Connecting warp yarn is wet-conducting chemical filament;High-twist triacetate fiber yarn and real silk fiber yarn are mutually twisted in surface layer fabric, and the wrinkle recovery effect of fabric can be improved after washing.And the use of wet-conducting chemical filament can improve the wet effect of fabric.

The present application relates to a kind of high mechanical property regenerated silk and its preparation method.The method includes the following steps: (1) preparation material: preparation chromium carbide (Cr3C2) suspension liquid;(2) preparation functional regenerated silk (RSF) fiber: Cr3C2 suspension liquid is mixed with silk fibroin solution, by wet spinning method, preparation functional Cr3C2 / RSF fiber composite.Cr3C2 significantly enhances the mechanical property of RSF and the absorption effect to ultraviolet light, reflects its excellent anti-ultraviolet performance.When not doped Cr3C2, the breaking strength of RSF fiber is 203.32±5.22Mpa, and after doping, the breaking strength is enhanced to 313.23±3.68MPa.After ultraviolet aging treatment, the breaking strength of RSF fiber is reduced to 126.54±4.88Mpa, and the breaking strength of Cr3C2 / RSF is 263.42±4.30Mpa.The composite fiber has good stability and biological safety, and has good application potential in the field of biomedical and functional textiles.

The application relates to the field of spinning fibers, and particularly discloses a superfine denier ES fiber and a preparation method thereof. The superfine denier ES fiber has a skin-core structure and comprises a skin layer material and a core layer material. The skin layer material comprises the following raw materials in parts by weight: 20-40 parts of PE resin, 2-3 parts of tannic acid modified aluminum nitride, 1-4 parts of a toughening agent, 0.5-1 part of an antioxidant, 0.2-0.6 parts of a dispersing agent and 0.1-0.5 parts of an antistatic agent. The core layer material comprises the following raw materials in parts by weight: 30-65 parts of PET resin, 1.5-2 parts of maleic anhydride grafted polyethylene, 5-15 parts of an ethylene-butyl acrylate-glycidyl methacrylate terpolymer and 1-2 parts of a nucleating agent. The ES fiber has the advantages of good mechanical properties and antibacterial properties, strong moisture absorption and excellent anti-reverse osmosis effect.

The application discloses a preparation method of a regenerated protein lyocell fiber based on ionic liquid dissolution and recovery of plush and silk fibroin, and comprises the following operation steps: S1, after waste plush or silk fibers are crushed, washed and bleached, the fibers are dissolved in a dissolving kettle by using a double-component composite ionic liquid solvent to obtain a protein ionic solution; S2, after the protein ionic solution is filtered, pre-crushed wood pulp and a thermoplastic polyurethane elastomer (TPU) are added and blended and stirred to form a uniform spinning dope; S3, the spinning dope is extruded through a circular spinneret and enters a coagulating bath to obtain a regenerated protein fiber; and S4, the regenerated protein fiber is subjected to secondary water washing, drafting, oiling, drying and cutting to obtain a regenerated protein lyocell fiber. The application prepares a double-component composite solvent by preparing a composite of N-methylmorpholine N-oxide bromide and 1-ethyl-3-methyl imidazole bromide salt, and applies the double-component composite solvent to dissolution of waste plush or silk fibers and preparation of a high-protein-content regenerated protein lyocell fiber.

This invention discloses a method for preparing chlortetracyanine photothermally modified silk fiber, belonging to the field of textile material modification technology. To address the problems of poor dispersibility, insufficient photothermal stability, and weak bonding with silk in existing photothermal modified silk fiber materials, this invention first synthesizes pentafluorophenol active ester (SP-PFP) through an esterification reaction of 1-thiophene-2-piperidine-4-carboxylic acid (SP-COOH) and pentafluorophenol (PFP). Then, thiophene groups are grafted onto the surface of the silk fiber through an amidation reaction. Subsequently, the grafted and modified silk fiber is immersed in a chlortetracyanine methanol solution, allowing the chlortetracyanine acid and thiophene groups to react on the silk fiber surface to generate a chlortetracyanine structure, ultimately yielding the photothermally modified silk fiber. This invention features a simple and environmentally friendly preparation process. The prepared chlortetracyanine photothermally modified silk fiber exhibits high photothermal conversion efficiency and long-lasting performance, while retaining the original softness, skin-friendliness, and biocompatibility of silk fiber. It can be widely applied in fields such as smart textiles and photothermal therapy.

This invention relates to an air-trimmed container comprising a composite sheet shell and an associated growth medium filler. The composite sheet is a nonwoven fabric substantially composed of a mixture of first and second types of fibers. The first type of fibers are selected from natural fibers; and a) the second type of fibers are selected from thermoplastic bicomponent or multicomponent fibers; or b) the second type of fibers are selected from thermoplastic monofilament fibers, and wherein the fiber mixture further comprises a third type of fiber, the third type of fiber being selected from thermoplastic fibers with a relatively higher melting point than the second type of fibers; wherein the composite sheet has a thickness of 180–400 micrometers at 100 kPa as measured according to ISO standard 534:1988.

This invention discloses an absorbent product with a nano-soft surface layer and its manufacturing method, belonging to the field of sanitary products technology. The sanitary product consists of a nano-soft surface layer, an absorbent core, and a leak-proof bottom layer. The nano-soft surface layer is composed of a nanofiber layer and a surface non-woven fabric, and the nanofiber layer is composed of several nanofibers stacked together. The manufacturing method of the sanitary product includes the following steps: S1, forming a spun fiber layer by electrospinning a spinning solution containing sodium alginate; S2, preliminarily drying and shaping the spun fiber layer; S3, reacting calcium chloride solution with the sodium alginate in the spun fiber layer, transforming the spun fiber layer into a nanofiber layer; S4, completely drying the nanofiber layer; S5, combining the nano-soft surface layer, absorbent core, and leak-proof bottom layer to obtain the absorbent product. The sanitary product of this invention can improve comfort during use.

This invention discloses a surface-enhanced Raman spectroscopy (SERS) substrate material, its preparation method, and its applications. The method includes the following steps: S1, extracting and pretreating silk material; S2, immersing the silk material in a chloroauric acid solution; S3, heating and reducing a mixture of silk material and chloroauric acid solution; S4, removing the silk material, washing, and drying to obtain the SERS substrate material. The SERS substrate of this invention significantly improves the detection sensitivity and selectivity for mucin through optimized nanoparticle distribution and porous structure. This invention uses silk fiber waste as a bio-substrate and utilizes sericin and fibroin for in-situ reduction, effectively reducing the use of toxic chemicals and improving the biocompatibility and environmental friendliness of the substrate. The preparation method of this invention is simple, low-cost, suitable for mass production, and convenient for on-site testing in resource-limited environments.

The application discloses a vertical fiber-liquid metal heat-conducting gasket and a preparation method thereof, and the preparation raw materials comprise a liquid metal, a fiber and silica gel. The application uses silk fibers, and the volume ratio of the liquid metal to the silica gel is controlled to be (1-2):1, so that the high-heat-conducting low-thermal-resistance material with the heat conductivity greater than 7 W / mk and the thermal resistance lower than 0.25 cm 2 k / w can be obtained.