bifid contraction film , nylon 6 (hereinafter referred to as Ny6) 60 ~ 85 parts by weight of meta xylylene adipamide (hereinafter referred to as MXD6) 15 ~ 40 parts by weight of contained (the total of both is 100 parts by mass) as a raw material , and this material is , Ny6 is 60 to 85 parts by weight , MXD6 is 15-40 mass by melt-kneading the raw material with virgin Ny6 and MXD6 made parts , the melting point of the MXD6 containing thermal hysteresis width ( ) , and in the 233 ~ 238 , the thermal history of product content is 5 to 40 mass %, based on total amount of raw material and , that the bifid contraction film when held for 30 minutes in the hot water of 95 , the shrinkage ratio of the film is 3 ~ 20%.
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