369results about "Stretch-spinning methods" patented technology

The invention provides an anti-static knitted fabric based on charge gathering and directional guiding, a preparation method of the anti-static knitted fabric and a knitted fabric, and belongs to the technical field of knitted clothes. A first spinning component and a second spinning component are co-extruded through melt spinning to prepare composite fibers with a parallel composite structure, and the composite fibers are subjected to thermal mechanical treatment to obtain the composite yarn; the composite yarn is directionally introduced into a specific area of the fabric in a tuck-float stitch mode through an embedded weaving technology, and latent curl is activated through after-treatment. The moisture absorption expansion of the second spinning component is utilized to drive the composite yarn to macroscopically self-crimp, and the conductive filler inside is physically extruded to construct an efficient conductive skeleton, so that the humidity response adjustment and charge directional dispersion of the anti-static performance are realized, and the problems of fixed conductive state, local static accumulation and poor comfort of the existing fabric are effectively solved; and the safety and wearing experience of the clothes are improved.

The invention discloses a jacquard vamp material based on bio-based degradable polylactic acid (PLA) and a preparation method thereof, and relates to the technical field of shoe materials. The jacquard vamp material is of a three-layer jacquard structure formed by integrally weaving PLA composite filaments through a jacquard warp knitting machine. The PLA composite filament is prepared from the following raw materials in parts by weight: 80-95 parts of polylactic acid (PLA) slices, 5-15 parts of poly (butylene adipate / terephthalate) (PBAT), 3-8 parts of a flexibilizer, 1-3 parts of a compatilizer, 0.5-2 parts of an anti-hydrolysis agent and 0.5-1.5 parts of a lubricant. According to the invention, the bio-based PLA is used as a main raw material and is matched with degradable auxiliaries such as PBAT, so that the whole vamp material can be completely biodegraded under a composting condition, the problem of environmental pollution of a traditional vamp is fundamentally solved, and meanwhile, through blending modification of PBAT and the flexibilizer, the flexibility and impact resistance of the PLA material are remarkably improved, and the vamp material has good application prospects. The requirements of the vamp material on softness, wear resistance and durability can be met.

The invention relates to the technical field of fabrics, in particular to a cool-feeling long cilia strip and a preparation method thereof.The cool-feeling long cilia strip is composed of cool-feeling fibers and a long cilia strip base material and is characterized in that the cool-feeling fibers comprise a core layer, a functional skin layer and an outer thin skin layer; the functional skin layer is prepared from the following components: a sulfonated copolyester matrix, catechol grafted master batch, surface modified zeolite nano powder, an anti-hydrolysis agent and an antioxidant, and the functional skin layer also contains introduced Zn < 2 + > and Mg < 2 + >. Zn < 2 + > and Mg < 2 + > which are stably combined on anchoring points of sulfonated copolyester are subjected to hydration endothermic reaction when being in contact with water, so that a cool feeling is generated; the surface modified zeolite nano powder synergistically enhances moisture absorption and water temporary storage by virtue of the specific surface area, and continuously provides water for an ionized hydration reaction to prolong and amplify a cool feeling effect; the catechol grafting structure endows the fiber with antibacterial performance, and long-term stability of the structure is ensured through an interface enhancement effect. And the outer layer hydrophilic polyester is matched, so that the product has comfort, durability and functionality.

The invention relates to the technical field of polyamide fiber manufacturing, and provides a porous polyamide fiber preparation method which comprises the following steps: respectively feeding skin layer polyamide, a cross-linking agent and core layer polyamide into a mouth mold; the pore-foaming agent is decomposed to generate gas, and the gas forms a uniform closed-pore structure in situ on the core layer chinlon; in the fusion cavity, the cross-linking agent is sandwiched between the core layer chinlon and the skin layer chinlon to generate a chinlon material with a skin-core chinlon cross-linked structure; after being pulled out through a spinning nozzle, the chinlon material is bundled through an oiling roller, and after oiling, chinlon fiber tows are formed; the polyamide fiber tows are subjected to graded stretching and winding forming, and finished polyamide fiber products are obtained. Therefore, a uniform closed pore structure is formed in the core layer chinlon through the gas decomposed by the pore-forming agent; a skin-core chinlon cross-linked structure with chemical bonding and low-heat-conduction network functions is formed between the core layer and the skin layer through a cross-linking agent. The thermal conductivity and the weight of the polyamide fiber are remarkably reduced, meanwhile, the polyamide fiber has high strength, and the light and warm-keeping polyamide fiber is obtained.

The invention discloses a polyetherketoneketone fiber anti-adhesion porous spinning method. The method comprises the following steps: dissolving polyetherketoneketone to obtain a spinning solution, and extruding the spinning solution through a porous spinneret plate to form a plurality of spinning trickles; the trickles enter a first coagulating bath to be preliminarily coagulated and formed, and fibers are obtained; dividing the fibers by a split type dividing plate, guiding the fibers into a second coagulating bath by a godet, washing with water, applying oil, and then drying; fibers enter the hot drafting device to be subjected to multi-stage hot drafting, and after heat setting, the fibers are tidied and wound by the buncher. The first coagulating bath is provided with a bath lotion supplementing unit, a circulating filtering system and an ultrasonic generator which are combined to quickly and uniformly update components of the coagulating bath; and the split type filament separating plate keeps a distance between fibers, prevents mutual adhesion and improves the double-diffusion efficiency in the second coagulating bath. The ultrasonic-assisted circulating filtration system is used for updating the synergistic effect of the coagulating bath and the split type filament separating plate, so that the problems that fibers are easy to adhere and are uneven in evenness and performance are effectively solved.

The invention belongs to the field of fiber materials, and provides a hollow acrylic fabric with thermal insulation performance and a preparation process thereof. The composite design of an acrylonitrile-based copolymer shell layer and an inner cavity silicon dioxide aerogel layer is adopted, a boric acid ester cross-linked network is formed through borax bath treatment to lock a three-dimensional crimp structure, and a hydrophobic modified silicon dioxide aerogel layer with the thickness of 50-200 nm is constructed in a fiber inner cavity; the mechanical-structural synergy that the single-fiber breaking strength is not lower than 3.5 cN / dtex under the condition that the hollowness degree is 30%-45% and the fiber dry-state crimp number is not smaller than 12 / 25 mm is achieved, the thermal resistance of the fabric reaches 0.065 m.K / W to 0.075 m.K / W, the air permeability is kept at 150 mm / s to 250 mm / s, and the fabric has the advantages of being good in air permeability, good in air permeability and the like. The contradiction between mechanical bearing and hollow structure design under the high-solid-content wet spinning fine denier condition, the contradiction between structural stability and fatigue durability of boric acid ester cross-linked three-dimensional curl after multiple times of water washing and the contradiction between low gram weight and high thermal resistance and the heat transfer mechanism of breathable comfort are solved, and the wide warm-keeping garment application value is achieved.

Mechanically and piezoelectrically anisotropic polymer fibers may be formed by spinning a polymer solution or gel that includes a high molecular weight crystallizable polymer and a liquid solvent. The solvent may be configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the spun fibers. The polymer solution may also include a low molecular weight additive. The high and low molecular weight polymers may each be characterized by a bimodal molecular weight distribution where the molecular weight of the additive is less than the molecular weight of the crystallizable polymer. The polymer(s) and the additive(s) may be independently selected from vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropene, vinyl fluoride, etc. The spun fibers may be oriented, annealed, poled, and woven or laminated to form a polymer thin film having a high elastic modulus and a high electromechanical coupling factor.

The invention discloses a preparation method of ultra-high molecular weight polyethylene fiber, fiber and spinning equipment, and the preparation method comprises the following steps: (1) mixing ultra-high molecular weight polyethylene powder with a solvent, uniformly swelling, and feeding into a twin-screw extruder for fully dissolving to obtain a spinning solution; spraying the spinning solution through a spinneret plate, drafting in an air gap, and cooling in a cooling bath to obtain gel silk; (2) carrying out shrinkage balance on the gel silk; then carrying out pre-extraction and pre-drying to obtain gel filaments with low solvent concentration, and storing the gel filaments in a filament containing barrel for later use; and (3) sequentially carrying out multi-stage extraction, drying, multi-stage drafting and winding on the jelly silk with low solvent concentration to obtain the ultra-high molecular weight polyethylene fiber. Through the steps of shrinkage balance, pre-extraction and drying treatment on the gel silk, adverse effects caused by solvent precipitation and gel silk shrinkage in the standing process of the gel silk can be reduced, the fiber fineness can be controlled to be stable and uniform, the production process is short, the occupied area of equipment is small, and the investment is low.

The utility model discloses a spinneret assembly which comprises a flow dividing piece and a flow guiding piece. After entering the inner cavity from the conveying channel, fibers are sprayed out to the flow guide face of the flow guide piece through the multiple spinneret orifices sequentially arranged along the straight line in the horizontal direction, and the uniform net laying effect is achieved. After being sprayed out from a group of spinneret orifices, fibers impact on the guide plate, change the flow direction and are vertically downward, and when reaching the lower end of the guide plate, the fibers are dragged by high-speed airflow sprayed out from the air outlet to fall down; the flow guide face plays a role in reversing the fibers, high-speed airflow sprayed out of the air outlet in the lower end of the flow guide face can also play a secondary traction and stretching role on the fibers, and the orientation and strength of the fibers are improved.

The present disclosure provides a system and method for producing nanofibers. The system includes an automated track system including a first track having a first face; and a second track having a second face facing the first face of the first track. The first track and the second track are positioned to define a proximal gap and a distal gap. The first track and the second track are adapted and configured to transfer a nanofiber coupled to the first face and the second face from the proximal gap to the distal gap. The system also includes a roving belt that is positioned to be partially disposed within the distal gap and is adapted and configured to decouple the nanofiber from the first face and the second face.

The application belongs to the technical field of textiles, and particularly relates to a high-low temperature TPU monofilament yarn, a processing technology thereof and a knitted vamp, comprising a TPU yarn with a skin-core structure, wherein the TPU yarn comprises a core layer and a skin layer, the core layer is modified for the purpose of improving the melting point, and the melting point of the skin layer is lower than that of the core layer; the core layer is modified by using a TPU raw material, so that the melting point of the core layer is improved, and the problem of poor thermal stability and easy decomposition under high temperature is solved; and the melting point of the core layer is higher than that of the skin layer, so that the processing cost of the whole monofilament yarn is reduced under the condition of modifying and improving the melting point.

The utility model relates to the technical field of woven bag processing, and discloses woven bag processing wire drawing equipment which comprises a bottom plate, a wire outlet mechanism is installed on the rear portion of the upper end of the bottom plate, a wire drawing groove is formed in the front end of the bottom plate, and stand columns are installed at the four corners of the lower end of the bottom plate. Electric hydraulic cylinders are mounted on the two sides of the lower end of the fixing plate; connecting blocks are mounted at the lower ends of the electric hydraulic cylinders; springs are mounted at the lower ends of the connecting blocks; fixing frames are mounted at the lower ends of the springs; a motor is installed on the left side wall of the left fixing frame, the front end of the motor penetrates through a motor shaft to be connected with a pressing wheel, an electric hydraulic cylinder is started, the electric hydraulic cylinder drives the pressing wheel to move downwards to press a silk thread, the motor is started, the pressing wheel is driven to rotate, the silk thread is flattened, wrinkles are avoided, two springs can drive the pressing wheel to elastically move, and therefore the silk thread is flattened. And the situation that the silk threads are stuck is avoided.

The present disclosure relates to a kit. The kit of the present disclosure comprises: a kit body comprising a needle tube and a needle, the first end of the needle being mounted to the needle tube; and a catabolic filling thread comprising a first segment and a second segment connected to each other, at least a part of the first segment being located inside the needle, and at least a part of the second segment being located outside the needle, wherein the catabolic filling thread is a thread made of poly-L-lactic acid. The kit of the present disclosure comprises a catabolic filling thread which can be composed of poly-L-lactic acid, is absorbable, has no residue, and is metabolized into lactic acid in the human body. Such a configuration makes the catabolic filling thread itself not only play a role in filling and tightening when filling surgery is performed using the catabolic filling thread of the present disclosure, but also the lactic acid after its metabolism can still stimulate fibroblasts in the skin and subcutaneous tissue to reconstruct the collagen framework in the human body by using fibroblasts.

The invention relates to a method for producing spunbonded fabric (1), wherein a spinning material (2) is extruded through a plurality of nozzle holes (4) of at least one spinneret (3, 40, 50) in order to form filaments (5), and each of the filaments (5) is stretched in the extrusion direction, wherein the filaments (5) are laid on a perforated conveyor device (10) in order to form a spunbonded fabric (1), and the nozzle holes (4) of the spinneret (3, 40, 50) are arranged along a main axis (6) aligned in the transverse direction (12) relative to the conveyor direction (11) of the conveyor device (10) such that the spunbonded fabric (1) formed on the conveyor device (10) is stretched in said transverse direction (12). The aim of the invention is to allow a reliable adjustment of the spinning width and the weight distribution per surface unit of the spunbonded fabric or allow the weight distribution per surface unit to be kept constant during an ongoing operation using said method. This is achieved in that the spinning material throughput (31) of the nozzle holes (4) is variably set along the transverse direction (12).

The present application relates to polybutylene terephthalate (PBT) material toothbrush filament technical field, specifically relates to a kind of multifilament version anti-lodging PBT monofilament and preparation method thereof;The preparation method is realized with the basic concept of multifilament to realize the basic form of monofilament, in the drawing process, every three monofilaments are gathered into a multifilament, in the subsequent water cooling, oiling etc. Process path, with the mode of multifilament, drafting, winding forming are completed.In the condition that monofilament specification remains unchanged, corresponding design is carried out to production process, and the quality indexes such as breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient of monofilament are controlled.In the realization equipment efficiency is improved three times target, product quality is upgraded, and the anti-lodging performance of PBT monofilament is improved.

The invention relates to a spinning stretching device, which can restrain air flow in a heat preservation box from becoming uneven in the axial direction of a heating roller under the condition that a plate-shaped component is arranged in the heat preservation box of the spinning stretching device. A plate-like member (41) is provided which protrudes forward from the rear surface of the incubator, the front surface of which serves as the door section (27), and which is disposed so as to be separated from the door section (27) in a closed state. A gap between the front end of the plate-shaped component (41) and the door part (27) in the closed state is blocked by a sealing component (61). As a result, the air flow in the axial direction (front-rear direction) of the heating roller can be prevented from becoming uneven.

The present application provides a unit for mounting yarn and a mixed yarn manufacturing device, which can easily perform a mounting operation of sequentially mounting a first group of yarns with respect to a plurality of guide rollers while operating a suction gun with both hands, can greatly shorten the operation time required for the mounting operation, and can greatly reduce the generated back yarn. In a mixed yarn manufacturing device (1) having guide rollers (31-35) that heat stretch a first group of yarns (Y1), a heat preservation box (30) having a box body (38) that accommodates the guide rollers (31-35), and a guide roller (36) that guides a second group of yarns (Y2), a unit for mounting yarn (5) is used during the mounting operation. The unit for mounting yarn (5) has a mounting portion (51) to the box body (38), a mounting portion (52) that extends along an edge portion of the box body (38) closer to the guide roller (36) than the guide rollers (31-35) and hooks the yarn (Y2), and the mounting portion (52) extends at a position protruding from an end surface portion of the guide rollers (31-35).

The invention relates to the technical field of para-aramid fiber production, in particular to a high-strength para-aramid fiber production device and process. A high-strength para-aramid fiber production device comprises a rack, a U-shaped yarn guide frame with a forward opening is arranged at the front end of the rack, a sealing cover is arranged at the top end of the rack in an up-down rotating mode, the yarn guide frame and the sealing cover can define a closed drafting cavity, the yarn guide frame comprises a rear plate connected with the rack, and side plates are arranged on the left side and the right side of the rear plate respectively. A comb-shaped yarn guiding opening is formed in the upper end face of the side plate, a hot tension roller set is arranged in the drafting cavity, a second motor for driving the hot tension roller set to rotate is arranged at the rear end of the rack, and a heating plate is arranged on the sealing cover. The high-strength para-aramid fiber production device is convenient to operate, good in heating stability and good in drafting effect, and the high-strength para-aramid fiber is finally obtained in cooperation with the para-aramid fiber production technology of two times of drafting.

This invention belongs to the field of spandex filament production technology and discloses a spandex filament manufacturing stretching and forming device and its forming method. The device includes a frame with transverse guide rails installed on both the front and rear sides. A longitudinal guide rail is fixedly installed at the center of the bottom of each of the two transverse guide rails. A threading hole is opened in the center of the left side of the frame, and a thread outlet hole is opened in the center of the right side of the frame. This invention utilizes high-pressure airflow as power to bring two movable tubes closer together, thereby fixing the fiber. When the air is released, the two movable tubes automatically reset, allowing the fiber to be removed. The entire process only requires controlling the opening and closing of valves, eliminating the need for manual knotting and disassembly. This effectively simplifies the fixing and unfixing process and promotes improved overall stretching and forming efficiency.

The invention discloses a novel modified elastomer foot pad and a preparation method thereof, and the preparation method comprises the following steps: mixing TPE elastomer, polycaprolactone glycol, hexagonal boron nitride and other components, carrying out twin-screw melt extrusion, cooling and pelletizing, then carrying out spinning extrusion on master batches, sequentially carrying out three-section temperature control drafting and heat setting to obtain TPE modified filaments, and carrying out extrusion molding on the TPE modified filaments to obtain the novel modified elastomer foot pad. Then doubling and twisting to obtain modified yarns, compounding the modified yarns with polyester low stretch yarns in proportion, weaving into a three-dimensional honeycomb structure through a warp knitting process, and cutting and forming to obtain the novel modified elastomer foot pad. By introducing multiple functional components into the TPE elastomer, the resilience and shape retention performance of the material can be improved, the interface bonding force can be enhanced in combination with the modified hexagonal boron nitride, the strength and stability of the TPE fiber are improved in cooperation with the master batch pretreatment and multi-section drafting and shaping process, and by means of the three-dimensional honeycomb structure weaving and zoning tension control process, the strength of the TPE fiber is improved. The novel modified elastomer foot pad with excellent buffering performance and durability can be prepared.

The invention relates to a high-antibacterial absorbable medical suture and a preparation method thereof, and belongs to the technical field of medical materials. According to the suture line, PPDO serves as a base material, PLGA is introduced to wrap TCS through a melt blending and spinning technology, and a TCS-coated PLGA core-shell structure antibacterial agent is prepared. A gradient degradation release system is constructed by utilizing the characteristic that PLGA is faster in degradation than PPDO, so that TCS is slowly and continuously released, and the defects of explosive release and insufficient later concentration of drugs in a traditional direct blending method are overcome. Meanwhile, the core-shell structure effectively avoids destructive pores formed in a PPDO matrix due to rapid dissolution of drugs, and greatly maintains the mechanical integrity of the matrix, so that the suture line can provide stable supporting force similar to that of a pure PPDO line in a key healing period in vivo, and the synergism and unification of long-acting antibacterial property, lasting mechanical supporting property and high operation reliability are realized.

The invention belongs to the technical field of diaphragm materials for water electrolysis hydrogen production, and particularly relates to a PEEK fiber for a diaphragm for water electrolysis hydrogen production, diaphragm base cloth and application. The PEEK fiber is prepared by adopting a specific cooling and stretching process, and has the advantages of high strength and the like; the base cloth is made of a specific weaving structure and is subjected to shallow sulfonation treatment. The diaphragm prepared from the PEEK fiber and the base cloth has the advantages of high strength, excellent durability and good surface resistance and air tightness, realizes the unification of low resistance, high air tightness, high strength and long service life, and is suitable for being used as a hydrogen production diaphragm of proton exchange membrane water electrolysis hydrogen production equipment; and the diaphragm is also suitable for being used as a hydrogen production diaphragm of alkaline anion exchange membrane water electrolysis hydrogen production equipment.

The invention discloses a polyimide yarn and a preparation method and application thereof, and the preparation method comprises the following steps: providing a polyimide endless tow, carrying out antistatic and / or softening pretreatment, preparing stretch-cut strips through a stretch-cut strip forming device, and spinning the stretch-cut strips into the yarn through drawing, roving and spinning processes. According to the method, the cutting, opening and carding procedures of traditional short fiber spinning are replaced with the traction spinning technology, the problems that polyimide fibers are large in static electricity and poor in cohesive force are solved in combination with targeted pretreatment, the breaking strength of finished yarn is larger than or equal to 3.5 cN / dtex, and the elongation at break is 6%-18%. The method is short in process, high in efficiency, low in energy consumption and small in fiber damage, the prepared yarn is suitable for the fields of high-temperature-resistant protective clothing, high-temperature filtering materials and the like, and compared with the prior art, the yarn forming quality and the production efficiency are better.

A manufacturing method of a fiber includes: mixing and stirring a plurality of raw materials, to form a mixed liquid, where the plurality of raw materials includes dry copper nanopowder with a particle size not more than 48 nm, a fiber slurry, and an additive; drying the mixed liquid, to remove moisture of the mixed liquid and form a processed raw material; heating the processed raw material, to make the processed raw material be in a semi-molten state; electrifying the processed raw material in the semi-molten state, and then extruding at least one fibril from the processed raw material in the semi-molten state; stretching the at least one fibril; and performing cooling and shaping on at least one stretched fibril, to form a final fiber product.

The application discloses a kind of polypropylene self-reinforced composite material and its preparation method and application, comprising: with copolymerization polypropylene as skin layer raw material, homopolymerization polypropylene is core layer raw material, by skin-core melt spinning and hot roller drafting, obtain polypropylene skin-core composite fiber;The polypropylene skin-core composite fiber is drafted, and silk is added, and is twisted and woven cloth treatment, obtain polypropylene composite fabric;The polypropylene composite fabric is stacked, and is treated by hot pressing, obtain polypropylene self-reinforced composite material.The preparation method of the application can give composite material with excellent structural stability and mechanical properties, the tensile strength of the obtained polypropylene self-reinforced composite material is as high as 100.5MPa~140.0MPa, the corresponding impact strength is 98.6KJ / m 2 ~110KJ / m 2 , exhibit obvious tensile strength and impact strength comprehensive improvement.

This invention provides a polyacrylonitrile fiber and its preparation method, relating to the field of polyacrylonitrile-based carbon fiber production technology. The method includes the following steps: sequentially subjecting nascent fibers to a water washing process, a hot water drawing process, an oiling process, a drying and densification process, and a steam drawing process to obtain polyacrylonitrile fibers. In any of the water washing, hot water drawing, oiling, and drying and densification processes, the following condition must be met: D×E×N / A = constant; where D is the diameter of the polyacrylonitrile fiber monofilament; A is the fiber width in the first step; E is the cumulative draw ratio applied to the fiber in each step of the second step; and N is the K number of the polyacrylonitrile fiber. This invention proposes matching production processes and drawing speeds for different fiber specifications to ensure thorough coagulation, washing, oiling, drying, and drawing of the fibers, avoiding unevenness of monofilaments in multifilaments, and preparing homogeneous polyacrylonitrile fibers.

The invention discloses a thermoplastic LCP (Liquid Crystal Polymer) composite material and a preparation method thereof. The composite material comprises 30-70wt% of a liquid crystal LCP fiber fabric as a reinforcing fiber and 30-50wt% of a thermoplastic resin matrix, the resin matrix can be selected from one of a thermoplastic polyurethane system or a modified polyether-ether-ketone system; the LCP fiber fabric is made of LCP fibers, and the fabric weave is plain weave; the preparation method comprises the four steps of LCP fiber spinning, LCP fiber reinforcement preparation, thermoplastic resin matrix preparation and melt impregnation molding. Wherein the LCP fiber is subjected to plasma surface treatment and silane coupling agent coating modification, a three-stage gradient hot drawing process is adopted for preparation, and finally the composite material is obtained through melt impregnation and hot press molding. The composite material has excellent mechanical properties and thermal stability, and can be used in the high-performance application fields of aerospace, electronics and the like.

The present application relates to the technical field of packing bags, and particularly relates to a preparation method of a high-strength polypropylene environment-friendly packing bag, which comprises the following steps in sequence: composite modified masterbatch preparation, multi-stage stretching gradient cooling wire drawing, three-dimensional interwoven base cloth weaving, environment-friendly coating treatment and composite connection forming. When the masterbatch is prepared, the interface compatibility is improved by adding reinforcing fibers and degradable resin; the performance of the flat wire is improved by adopting the multi-stage stretching combined with the gradient cooling process; the three-dimensional bearing structure is formed by embedding the reinforcing rib during weaving; the weather resistance is improved by using the degradable water-based coating; and the hanging belt and the bag body are connected by adopting the process combining ultrasonic welding and sewing. The present application comprehensively improves the mechanical strength, weather resistance and environmental protection of the packing bag, solves the problems of insufficient strength, easy aging, environmental pollution and unreliable connection of the traditional product, has excellent comprehensive performance, and is suitable for large-scale industrial production.

The present invention refers to a method and device for the preparation of microfibres and nanofibres based on hyaluronic acid and / or a water-soluble metal or non-metal salt thereof or a mixture of salts and / or a derivative of hyaluronic acid by method of dry spinning, and two-dimensional or three-dimensional fibrous materials from this microfibres and nanofibres. The resulting 2D or 3D materials can be for example in the shape of layer or cotton wool. Furthermore, the present invention refers to a device for performing this method, that contains an extrusion part containing a pass-through channel, that has an inlet opening for feeding the spinning solution and a dispensing opening for dispensing the spinning solution and furthermore the device contains an air nozzle, the air outlet opening of which is arranged to direct the exiting air into the area surrounding the dispensing opening of the extrusion part parallel to the axis of the dispensing opening of the extrusion part.

The present invention relates to a method for air jet texturizing or air entangling a silk filament or multifilament. Further, the present invention relates to a texturized or entangled silk filament or multifilament obtained by this method. Furthermore, the present invention relates to a yarn comprising the texturized or entangled silk filament or multifilament. In addition, the present invention relates to the use of the silk filament, multifilament, or yarn in the textile industry.