Polyvinyl chloride fiber for artificial hair, manufacturing and apparatus of the same

Abstract

The present invention is to provide a polyvinyl chloride (PVC) fiber for artificial hair. The PVC fiber is manufactured by melt spinning a PVC resin composition with a nozzle, wherein the nozzle has a nozzle hole having a diameter D and a land length L, and a nozzle leading portion having a cone angle, and wherein a ratio of L/D is 1-3, a height of the nozzle leading portion is at least 4 mm, and the cone angle is 20°-90°. The resulting PVC fiber has an arithmetic mean roughness of 0.18-0.38 μm and a maximum height of 0.5-3.5 μm along a longitudinal direction, specified by JIS B 0601.

1 . A polyvinyl chloride (PVC) fiber for artificial hair having an arithmetic mean roughness Ra of 0.18-0.38 μm and a maximum height Ry of 0.5-3.5 μm along a longitudinal direction, specified by JIS B 0601, said PVC fiber being manufactured by melt spinning a PVC resin composition with a nozzle, wherein said nozzle has a nozzle hole having a diameter D and a land length L, and a nozzle leading portion having a cone angle, and wherein a ratio of L/D is 1-3, a height of the nozzle leading portion is at least 4 mm, and the cone angle is 20°-90°.  
   
   
       2 . The PVC fiber as claimed in  claim 1  having a section specified by (L*M max )/S of 4.2-7.0, wherein M max (mm) is the maximum line segment, S(mm 2 ) is a sectional area, and L(mm) is a length of an outer circumference.  
   
   
       3 . The PVC fiber as claimed in  claim 1  or  2 , wherein said PVC resin composition contains 100 parts by mass of a PVC resin, (a) 0.3-3.0 parts by mass of a higher fatty acid ester lubricant, (b) 0.3-1.5 parts by mass of a polyethylene lubricant, with a mixing ratio (a)/(b) of 0.5-4.  
   
   
       4 . The PVC fiber as claimed in any one of claims  1 - 3 , wherein said PVC resin composition contains 0.2-5.0 parts by mass of an inorganic thermal stabilizer selected from a hydrotalcite or zeolite.  
   
   
       5 . A method of manufacturing a polyvinyl chloride (PVC) fiber for artificial hair, comprising the steps of: 
 melt spinning a PVC resin composition with a nozzle having a nozzle hole of a diameter D and a land length L, and a nozzle leading portion having a cone angle, wherein a ratio of L/D is 1-3, a height of the nozzle leading portion is at least 4 mm, and the cone angle is 20°-90°; and    discharging the PVC resin composition with an amount of 65-165 g/h per nozzle.    
   
   
       6 . The method as claimed in  claim 5 , wherein said PVC resin composition contains 100 parts by mass of a PVC resin, (a) 0.3-3.0 parts by mass of a higher fatty acid ester lubricant, and (b) 0.3-1.5 parts by mass of a polyethylene lubricant, with a mixing ratio (a)/(b) of 0.5-4.  
   
   
       7 . The method as claimed in  claim 5  or  6 , wherein said PVC resin composition contains 0.2-5.0 parts by mass of an inorganic thermal stabilizer selected from a hydrotalcite or zeolite.  
   
   
       8 . The method as claimed in any one of claims  5 - 7 , further comprising the step of discharging the PVC resin composition with an amount of 80-150 g/h.  
   
   
       9 . A melt spinning apparatus for manufacturing a polyvinyl chloride fiber for artificial hair, having a nozzle, said nozzle comprising: 
 a nozzle hole having a diameter D and a land length L; and    a nozzle leading portion having a cone angle,    wherein a ratio of L/D is 1-3, a height of the nozzle leading portion is at least 4 mm, and the cone angle is 20°-90°.