A method for restoring the three-dimensional structure of nonwoven materials through the central axis of fibers

Abstract

The invention relates to a method for restoring the three-dimensional structure of a nonwoven material through the central axis of the fiber, extracting the central axis of the fiber through the microscopic image of the multi-layer multi-focal plane nonwoven material in the same field of view, and then restoring its three-dimensional shape and position in the nonwoven material method, multi-layer microscopic image acquisition and fusion, circular segmentation of fibers and selection of center point, calculation of center point depth, extraction of fiber central axis and restoration of the three-dimensional surface of fiber closure; by extracting the source point on the fiber central axis The depth and the cross-sectional radius of the fiber at the source point, and then the three-dimensional coordinates of the fiber axis and the closed surface are restored by spatial interpolation. Compared with other reconstruction methods, the present invention truly restores the longitudinal connection between fibers, and provides high-quality data for subsequent research on key parameters such as pore size and distribution, pore inner surface area, pore volume, air fluid resistance and pressure difference. 3D model.

Description

technical field [0001] The invention relates to a three-dimensional reconstruction technology of non-woven materials, in particular to a method for restoring the three-dimensional structure of non-woven materials through the central axis of fibers. Background technique [0002] The spread of the 2019 novel coronavirus (2019-nCoV) around the world has greatly increased people's demand for air filtration protection products. Most air filtration products such as masks, dust masks, air filters and other core materials have more air filtration layers. Melt blown nonwoven material is used. Good nonwoven materials are required to efficiently capture particles and viruses of different sizes in the air under low filter resistance conditions. There are abundant multidirectional three-dimensional micro-curved channels and high porosity inside the nonwoven material, so it has very good filtration performance. However, it is precisely because the pore structure of non-woven air filter ...

AI Technical Summary

Problems solved by technology

But the main problem is that within the depth of field of the optical lens, the surface of the fiber will be imaged repeatedly in multiple layers, which makes it difficult to calculate the unique depth of the surface point, and the lower layer is blocked, so the reconstructed 3D model is only the focal point of each layer Each fiber is cut off and incoherent, and the connection between layers is lost, as well as the true shape of the fiber in space.

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