Stretching technology is used to modify the properties of plastic film by aligning the molecules in heated plastic film through stretching it. When stretching strength is applied in one direction then this is referred to as uniaxial stretching, while stretching in two directions is called biaxial stretching.
At Nitto Denko we use precision stretching technology especially in optical films such as retardation films, which increase viewing angle, and polarizing films, both of which are essential in products such as LCDs.
This technology is also used in the production of porous films such as those used in filters to separate foreign objects while still providing permeability.
Through stretching it is possible to align the molecules in PVA and realize a polarizing function.