lehtmetalli (plekk, riba) tasapinnalisuse saavutamine lehtvormimiseks ettevalmistamisel rullõgvendus- ja venitusõgvendusmeetodeid kasutatdes (vt rullõgvendus, venitusõgvendus), the removal of irregularities or distortion in sheet, strip or plate etc by a such methods as roller leveling or stretcher leveling (see: roller leveling, stretcher leveling)