異形度（繊維、押出成形）

異形（型）度：
shape irregularity (?)
modification degree (?)

US8297035 (JP)
"The polyester fiber of the invention also includes a modified cross section polyester fiber formed of the copolymerized polyester. Only the modified cross section can provide a fiber excellent in hue. However, the cross sectional shape of the polyester fiber in the invention preferably has a modification degree（異形度）satisfying the numerical value range of 1.2 to 7.0. By achieving the fiber cross section with such a high modification degree, it is possible to implement a polyester fiber having further excellent gloss."

US20140120336 (JP)
"[0060] The term "modification ratio"（異形度）used herein is the value determined by the same method as the diameter of the island component and the variation of the island component diameter as described above. More specifically, the modification ratio is a value determined by taking two dimensional pictures of the cross section of the island-in-a-sea composite fiber, depicting perfect circle inscribing the cross section (contour) of the island component in the picture at the largest number of (2 or more) points as shown by the dot-and-dash line in FIG. 1 (3 in FIG. 1) as the inscribing circle to thereby use the diameter of the perfect circle as the diameter of the inscribing circle, calculating the modification ratio by the following equation:"

WO2007052570 (JP)
"A fiber with a modified cross section（異型断面）having excellent bulkiness, not fused, and manufacturable stably. In the fiber with the modified cross section, at least two hollow parts with openings that are open in the longitudinal axis of the fiber are formed in the cross section of the fiber. These two hollow parts are symmetrically formed with their backs facing each other, and the cross section of the fiber is formed in such a shape that generally C-shaped portions each curved arcuately are joined with their backs facing each other."

WO200161083 (JP)
"A modified cross-section（異型断面）fiber characterized in that a fiber cross-section shape is formed by combining a center element with 5 to 30 flower petal-like protrusions continuing and radially extending from the center element toward the outer periphery of the fiber, a length from the base to the tip end of each petal-like protrusion is 3 to 45% of the maximum outer diameter of the fiber, and each petal-like protrusion has at least two edges having angles of 45 to 115 degrees."