8 results about "Melt electrospinning" patented technology

The invention discloses a melt electric writing nonlinear fiber printing accuracy evaluation method and system based on pixel superposition, and relates to the technical field of textile methods. The method comprises the following steps: image preprocessing: cutting, aligning and zooming an actual printing fiber pattern image to enable the actual printing fiber pattern image to be consistent with a starting point, a direction and a resolution of a target pattern image; smoothing the image, binarizing the image, and finally removing stray points; coincident pixel point calculation: after the printed fiber pattern is obtained, increasing the pixel width of the target pattern, and performing coincident pixel point calculation on the target pattern and the printed fiber pattern in the increasing process; and printing error calculation: calculating a printing error E by analyzing the change of the number of overlapped pixel points along with the increase of the width, and quantitatively reflecting the deviation between the printed fiber pattern and the target pattern. The method and system can evaluate the printing accuracy of nonlinear fibers.

The application discloses a kind of microfiber scaffolds, organoid tissue patches and preparation method and application thereof.The microfiber scaffold is prepared using melt electrospinning process, by introducing stepwise translation deposition path in the same deposition plane, so that the continuous deposition of multiple microfibers forms stable convergence node structure at predetermined position, thereby constructing microfiber network with regular pore and continuous support topology.The stepwise translation deposition includes at least one repeated deposition with preset in-plane offset after the completion of the first pass fiber deposition, to reduce the electrostatic interference between fibers and promote node formation.The scaffold structure is stable, open and thin, suitable as a tissue engineering support structure.The application also provides an organoid tissue patch composed of the scaffold loaded organoids and a construction method thereof, which can be used to cover tissue injury interface, such as post-hepatectomy section repair.

The application belongs to the technical field of melt electrospinning equipment, and provides a screw-embedded self-viscosity-reducing melt electrospinning nozzle, which comprises a first inner sleeve, a second inner sleeve arranged outside the first inner sleeve, a first flow gap arranged between the first inner sleeve and the second inner sleeve, an outer sleeve arranged outside the second inner sleeve, a stirring part for stirring the melt in the first sleeve, and a motor for driving the screw to rotate. The melt in the first inner sleeve is stirred by the screw, and the melt is sprayed onto the nozzle cone surface through the second flow outlet under the action of pressure. The melt is subjected to twice physical actions, so that the viscosity of the melt is greatly reduced, and the functions of refining the fiber and improving the product quality are achieved.

A high-toughness sheath-core fiber, medical dialysis paper, and a preparation method thereof are provided. According to the present disclosure, a certain proportion of cellulose nanofibers are added to the polyethylene sheath layer and the polypropylene core layer respectively for melt blending to obtain a sheath component and a core component, then coaxial melt electrospinning is performed to obtain the high-toughness sheath-core fiber. The high-toughness sheath-core fiber is added to the raw materials of the medical dialysis paper at a mass ratio of 2-20%. After wet papermaking, the sheath layer of the fiber is melt-bonded using a hot-pressing method, which allows the substances between the sheath layers to melt and mix, improving the paper strength. The prepared medical dialysis paper exhibits excellent antibacterial property.

The application discloses mesophase pitch carbon fiber and a preparation method thereof, and the method comprises the following steps: 1) adding 0.1-0.3 wt.% of carbon nanotubes or graphene into molten mesophase pitch to obtain a composite; 2) adopting a melt electrospinning process, and performing melt spinning on the composite at 295-360 DEG C to obtain a raw yarn; and 3) performing pre-oxidation and carbonization on the raw yarn to obtain mesophase pitch carbon fiber. By adding a small amount of carbon nanotubes or graphene, the spinnability of the melt electrospinning of the mesophase pitch can be improved, and the orientation of carbon atoms along the axial direction can be enhanced, and the prepared carbon fiber has better performance.

Melt electrospinning processes, including: S1, Heating an inorganic material to a molten state to form a melt, and S2, Forming the melt into fibers by electrospinning, wherein the melt electrospinning is carried out at an ambient temperature of no more than 100 °C and normal pressure; wherein the inorganic material is silicon or tin, and wherein the melt flow rate during the electrospinning process is 2 to 10 µl / min; wherein the melt electrospinning is carried out under vacuum, an inert atmosphere or a reduction atmosphere, wherein the inert atmosphere is selected from nitrogen and / or argon, and wherein the reduction atmosphere comprises hydrogen; where the voltage for electrospinning is set to be between 10 and 50 kV.

The application provides a melt electrospinning intelligent monitoring and regulating system and method based on orthogonal double vision, and belongs to the cross field of machine vision and melt electrospinning process control. The system adopts two cameras with mutually orthogonal optical axes and perpendicular intersection with the nozzle axis to synchronously collect orthogonal projection images of Taylor cones and jets; based on double-view segmentation masks, an elliptical cross-sectional area integration method is used to reconstruct the three-dimensional volume of the Taylor cone, and the real-time value thereof is used as a feedback signal to adjust the spinning voltage through a closed-loop controller; meanwhile, a complete two-dimensional jet lag vector is synthesized from the double views, the dynamic response thereof is represented by an inertial differential equation, and a two-stage strategy combining steady-state global offset and corner dynamic transition is used to pre-compensate the numerical control track instruction offline. The voltage regulation and track compensation respectively act on two independent physical channels of a high-voltage power supply and a motion controller, and do not interfere with each other in time sequence, so that the synchronous control of fiber diameter uniformity and deposition track precision is realized.

The invention discloses a portable melt electrostatic spinning test device with an intelligent feeding function, which is applied to the technical field of spinning, and can be matched with a conveying assembly, a mixing assembly and an adjusting assembly by arranging a blending mechanism and a concentrating assembly, and the conveying assembly is supported and limited by the concentrating assembly, so that the conveying assembly is supported and limited by the adjusting assembly; a raw material and additive storage space can be formed, the mixing assembly can be supported and limited, various different additives can be blended on site through the adjusting assembly, the blended additives can be conveyed to the mixing assembly, and the mixing assembly can convey the additives into the conveying assembly after mixing the additives. And the additives and the raw materials are mixed, so that the additives and the raw materials can be provided for the spinning machine body through the concentration assembly, and the flexibility of proportioning the raw materials and the additives is improved.