A cikin aikin samarwa, shimfiɗa na jakar jakar da yankan injin lebur yarn shine zafi da yaren da aka sayo, don a ƙasa da sarkar jakar yankan da aka saka yana da santsi a babban matakin. Tsarin tsari na shugabanci mai shimfiɗa yana ƙara ƙarfin ƙarfi tsakanin sarƙoƙin ƙwayoyin cuta da inganta haɓakar kusancin ɗan yaren.
Saboda haka, ingantacciyar hanyar sarrafa ƙwararrun kusancin waya shine don saita rabo mai shimfiɗa da ya dace. Mafi girma raguwar shimfiɗa daga cikin injin yankan da aka saka, mafi girma dangi ya karya karfi na farwar yarn. Dangane da girman rabo daga cikin farn yarn na lebur, an tabbatar da ta ta hanyar hayar karfi da kuma rushe elongation na lebur yarn.
