Ems - Grivory, Switzerland, has newly developed amorphous nylon copolymers for improving the stretch orientation of semicrystalline nylons, such as the blends of amorphous nylon copolymers and semicrystalline nylons. New grades Grivory G FE 4494 and G FE The crystallinity and glass transition temperature of 4483 are lower than those of the semi-crystalline nylon in the blend component, and thus are easily stretched and can be stretched at lower temperatures. The modified blend is suitable for the plastic forming and stretching orientation processing processes, and is used for preparing high-grade products such as sausage packaging and shrink packaging bags which require high shrinkage and high shrinkage due to the increase of the degree of orientation.