Spunbond nonwoven fabric
A technology of spunbond non-woven fabric and complex viscosity, which is applied in the field of spunbond non-woven fabric, can solve the problems of reduced productivity, broken filaments, and difficulty in stable production, and achieve high orientation parameters, large crystallite size, and high degree of crystal orientation Effect
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Embodiment 1
[0174] A polypropylene-based resin belonging to a propylene homopolymer with a melt mass flow rate of 200 g / 10 minutes and a melting point of 160 ° C is melt-extruded through a single-screw extruder, and the spinning spinneret is metered by a gear pump. Supply polypropylene resin. The spinning temperature (spinneret temperature) is set at 230°C, and the polypropylene-based resin is made from a spinneret hole with a hole diameter D of 0.30 mm and a molding section length L of 0.75 mm under the condition of a single hole discharge rate of 0.6 g / min. discharge. The introduction hole located directly above the spinneret hole is a straight hole, and the connection between the introduction hole and the spinneret hole uses a tapered spinning spinneret. For the discharged fibrous resin, start from the distance of 40 mm from the spinning spinneret, and blow an air stream at 12°C from the outside of the sliver (fibrous resin) at a speed of 30 m / min. Pulled by a machine at a speed of 4...
Embodiment 2、3
[0176] [Example 2, 3, Comparative Example 1]
[0177] The inflow air pressure of the injector was changed, and the spinning speed was changed to 6.9 km / min in Example 2, 3.1 km / min in Example 3, and 2.6 km / min in Comparative Example 1. Other than that, the same method as in Example 1 was used to obtain a spunbond nonwoven fabric.
[0178] The results are shown in Table 1. According to Table 1, it can be seen that the average single fiber diameter of the spunbonded nonwoven fabric obtained in Example 2 is 11.0 μm, the degree of crystal orientation is 0.942, the crystallite size of the (110) plane is 19.4 nm, the orientation parameter is 8.83, and the complex viscosity is 53 Pa·sec, and the average single fiber diameter of the spunbonded nonwoven fabric obtained in Example 3 is 16.5 μm, the degree of crystal orientation is 0.913, the crystallite size of the (110) plane is 14.5 nm, and the orientation parameter is 8.05, The complex viscosity was 57 Pa·sec, and the spunbond nonwov...
Embodiment 4、5
[0183] [Example 4, 5, Comparative Example 3]
[0184] The melt mass flow rate of the polypropylene resin used was changed to 170 g / 10 minutes in Example 4, 450 g / 10 minutes in Example 5, and 60 g / 10 minutes in Comparative Example 3, except Other than that, the same method as in Example 1 was used to obtain a spunbond nonwoven fabric.
[0185] The results are shown in Table 1. According to Table 1, it can be seen that the average single fiber diameter of the spunbonded nonwoven fabric obtained in Example 4 is 13.8 μm, the degree of crystal orientation is 0.922, the crystallite size of the (110) plane is 16.5 nm, the orientation parameter is 9.37, and the complex viscosity It is 83 Pa·sec, and the spunbonded nonwoven fabric has few defects and is excellent in flexibility and processability. In addition, it was found that the average single fiber diameter of the spunbonded nonwoven fabric obtained in Example 5 was 13.6 μm, the degree of crystal orientation was 0.912, the crysta...
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