What is the effect of screen mesh number and color on exposure?

What is the effect of screen mesh number and color on exposure?

At present, there are more varieties of screen, the product is uneven, but there must be clear, the mesh number and silk diameter determines the opening rate and mesh thickness of the screen, at the same time, and affect the on-line presence of photosensitive emulsion, obviously, the opening rate of large, silk coarse silk screen coated photosensitive emulsion thick, so the exposure time should be lengthened, conversely, the exposure time is shortened. In general, the white silk screen is prone to light scattering phenomena, UV reflection to the edge of the image should not be exposed, resulting in the image edge is unclear, appearance sawtooth, although the exposure time is short, but affect the screen resolution and the clarity of lines. and yellow screen can absorb wavelength in 350~420nm ultraviolet rays, effectively weaken the scattering light to the network version of the destructive effect. Experimental results show that the use of warm-yellow screen plate, ultraviolet irradiation on the yellow screen, reflected light has no harmful wavelength of 350~420nm. Because of the elimination of ultraviolet light scattering, can get a clear edge and text, so, in the production of fine screen, should be as possible to choose the yellow screen sedan, and by selecting the best exposure time to improve the screen printing power, also conducive to the Web Edition recycling.