Nanofiber based composite false twist yarn and manufacturing method therefor
By forming large-diameter slitting rolls in the slitting and joining processes of nanofiber membranes, and then compound twisting with natural or synthetic fibers, the problem of low precision slitting continuity in the preparation of nanofiber false-twisted yarns is solved and improves efficiency. The productivity and physical properties have expanded the application of nanofibers in the industrial field.
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Embodiment 1
[0084] Example 1: Preparation and first slitting of polyvinylidene fluoride nanofiber web
[0085] The polyvinylidene fluoride polymer is dissolved in a mixed solvent (DMAc / Acetone=90 / 10 weight percent) to prepare a spinning solution so that it becomes 20 weight percent. The spinning solution was transferred to the spinning nozzle by a quantitative pump, and the applied voltage was 25kV, the distance between the spinning port and the current collector of 20cm, the discharge volume per minute of 0.05cc / g·hole, the temperature of 30℃, 60 Spinning was performed under conditions of 5% relative humidity and normal pressure to obtain a nanofiber web.
[0086] figure 2 In order to show the scanning electron micrograph of the polyvinylidene fluoride nanofiber web obtained according to this embodiment, it can be seen that it is formed of uniform polyvinylidene fluoride nanofibers with an average diameter of about 300 nm.
[0087] The basis weight of the above-mentioned nanofiber web is abou...
Embodiment 2
[0089] Example 2: Preparation of polyvinylidene fluoride nanofiber tape yarn
[0090] Use the second precision slitting machine with a cutter interval of 1.5mm and 12 cutters (refer to Figure 4 Part (a)) After the second slitting of the large-diameter slitting roll prepared in Example 1 above, on the flat spool and H spool (refer to Figure 4 Part (b) of Figure 4 Part (d)) roll to obtain a polyvinylidene fluoride nanofiber tape yarn composed of nanofiber membranes. Figure 4 Part (c) is a scanning electron micrograph showing the nanofiber tape yarn. It can be confirmed that the nanofiber tape yarn is precisely slit with a width of 1.5 mm.
Embodiment 3
[0091] Example 3: Preparation of nanofiber false twisted yarn and composite false twisted yarn
[0092] A two-for-one twisting machine was used to perform right-twisting (S twist) on the nanofiber tape yarn prepared in Example 2 at 500 T / M to prepare a false twisted yarn of nanofibers alone.
[0093] Figure 5 Part (a) and Figure 5 Part (b) shows the photograph of the cone sample of the double-twisted false-twisted yarn and the scanning electron microscope photograph of the double-twisted false-twisted yarn prepared by the double-twisting machine. As shown in the figure, in Figure 5 In the scanning electron micrograph of part (b), it can be confirmed that the false twisted yarn is composed of nanofibers alone.
[0094] In addition, in the polyvinylidene fluoride nanofiber tape yarn prepared in the above-mentioned Example 2, the right twist (S twist) and the left twist (Z twist) were false twisted at 500T / M, respectively, using a composite twisting machine at 1000T / M. Under the con...
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