Method for manufacturing spun-bonded water-soluble polyvinyl alcohol nonwovens
A technology of polyvinyl alcohol and non-woven fabrics, applied in the field of non-woven fabrics, can solve the problems of environmental pollution and application range limitations of chemicals, and achieve the effects of being beneficial to environmental protection and having a wide range of water-soluble temperatures
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Embodiment 1
[0027] Pre-crystallize polyvinyl alcohol particles with a degree of polymerization of 1700 and a degree of alcoholysis of 89 at 80°C for 8 hours, and dry them under vacuum at 85°C for 24 hours to make the water content of the particles less than 5×10 -5 .
[0028] The dried polyvinyl alcohol particles are placed in a screw extruder for melt spinning, the spinning temperature is 195°C, 18020 holes are used, and the spinneret with a hole diameter of 0.35mm forms a spinneret with a total length of 3730mm Components are used for spinning, the spinning pump is 70cc, the rotating speed is 25 rpm, and the obtained polyvinyl alcohol as-spun fibers are stretched under positive pressure, the pressure of compressed air is 0.15MPa, and the stretching speed is 4000m / min .
[0029] Pass the stretched polyvinyl alcohol filaments through the wire-forming device, and when the moving speed is 130m / min, it will get 20g / m 2 The fiber mesh with a door width of 3.5m.
[0030] Then the obtained p...
Embodiment 2
[0032] Pre-crystallize polyvinyl alcohol particles with a degree of polymerization of 1200 and a degree of alcoholysis of 89 at 80°C for 8 hours, and dry them under vacuum at 85°C for 24 hours to make the water content of the particles less than 5×10 -5 . Melt spinning was carried out in the same apparatus as above, the spinning temperature was 210° C., the rotation speed of the metering pump was 0.25 MPa, and the stretching speed was 3000 m / min. When the moving speed is 90m / min, you will get 40g / m 2 The fiber mesh with a door width of 3.5m.
[0033] Then the obtained polyvinyl alcohol web is pressed by a hot roll at 130°C, the pressure is 60KG, thermally bonded, and finally crimped to obtain a water-soluble temperature of 80°C, a longitudinal tensile strength of 90N / 5cm, and an elongation of 20 %, the transverse tensile strength is 62N / 5cm, the elongation is 28%, and the polyvinyl alcohol nonwoven fabric with uniform fiber distribution.
Embodiment 3
[0035] Pre-crystallize polyvinyl alcohol particles with a degree of polymerization of 1000 and a degree of alcoholysis of 88 at 80°C for 8 hours, and dry them under vacuum at 85°C for 24 hours to make the water content of the particles less than 5×10 -5 .
[0036] Melt spinning was carried out in the same apparatus as above, the spinning temperature was 220° C., the pressure of compressed air was 0.4 MPa, and the drawing speed was 2000 m / min. When the moving speed is 60m / min, it will get 60g / m 2 The fiber mesh with a door width of 3.5m.
[0037] Then the obtained polyvinyl alcohol web is pressed by a hot roll at 140°C, the pressure is 60KG, thermally bonded, and finally crimped to obtain a water-soluble temperature of 70°C, a longitudinal tensile strength of 125N / 5cm, and an elongation of 40 %, a transverse tensile strength of 100N / 5cm, an elongation of 50%, and a polyvinyl alcohol nonwoven fabric with uniform fiber distribution.
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