High-shrinkage polypropylene fibers

Comparison of Crystalline Structure of Conventional and High-Shrinkage Polypropylene Fibers... 

Orientation in Crystalline and Amorphous Regions of High-Shrinkage Polypropylene Fiber... 

High-shrinkage polypropylene fiber is mixed with conventional fibers in spinning to yield a fluffy yarn. The proportion of blending depends on the end-use. The blend ratio for mixed spinning generally include the following variations ... 

Ube-Nitto Chemical Products, Japan, has also developed a high-strength (HS) polypropylene fiber under the brand name Simtex. The technology is principally to optimize the crystallization of fiber by a new orientation technique. The HS fiber exhibits strength up to 88-115 cN/tex versus 40 60 cN/tex for the conventional polypropylene fiber. The heat shrinkage rate is below 50%. It also has high chemical resistance, especially to organic... 

Polypropylene, PP, was blended with a random crystalline terpolymer of 96-85 wt% propylene, 1.5-5.0 wt% ethylene, and 2.5-10 wt% C4 g alpha-olefin. The blends were used to manufacture strands of multiple monofilamcmts m staple fibers with high resiliency and shrinkage, for pile fabric. 

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