Isotactic polypropylene synthetic fiber is the world's "five-lun," one, referred to as polypropylene, polypropylene does not contain any functional group, so far no dye can be dyed, pigment masterbatches for melt spinning into account PP colored fibers more than 95%.
Press polypropylene fiber processing conditions can be divided into long fibers, staple fibers and nonwovens.
Screw melt spinning process, the polymer with a certain flow from the spinneret capillary extrusion between spinneret and the winding device, the yarn must be stretched to the required fineness and fully cooled and solidified. Melt spinning spinneret aperture is generally within the range of 0.1 ~ 0.4mm, and the diameter of a single filament wound only 10 ~ 30μm. After that is the melt through the nozzle holes, filament diameter need to be reduced tenfold, a hundredfold stretch the length required. Superfine polypropylene fabric born spinning speed so that the current from the original 300m / min increased to 2500m / min, a single diameter is less than 1μm. Therefore masterbatch pigment dispersion of heat resistance and (especially diameter) made with high demand.
Polypropylene spinning problems and their solutions:
1. Adverse characterization: spinnerets broken wire more
Reason: masterbatch pigment particles large
Solution:
Sheathing material production process: Strengthening filters
