Screen angle: The angle between the direction of lines or dot elements and the horizontal. Different screen angles are required tor different colours so that the coloured dots do not superimposed to produce black.

• 网角:黑子元素或网线方向与地平线所造成的角度。四色彩印，不同颜色需用不同网角，否则，各色的网点重叠，成为黑点。