Position:Site angle
Presswork in plate making, the choice of site angle is having crucial effect. Choose wrong site angle, will appear interference stripe.
Common site point of view has 90 to spend, 15 degrees, 45 degrees, 75 degrees a few kinds. 45 degrees site expression is optimal, stable and do not appear inflexible; 15 spends those who mix 75 degrees angle stability should be differred a few, visual effect is not inflexible also nevertheless; 90 degrees angle is the stablest, but visual effect is too inflexible, do not have aesthetic feeling.
Two plant or the site of two kinds of above is covered together, can have each other interference, arrive badly when interference when influence image is beautiful, the “ moire ” that says with respect to occurrence common.
Generally speaking, the differential seat angle of two kinds of sites mixes 60 degrees in 30 degrees when, interference stripe of whole is more beautiful; It is 45 degrees site differential seat angle next; When mixing 75 degrees for 15 degrees when the differential seat angle of two kinds of sites, interference stripe has caustic picture beautiful.
The picture is as follows:
Site line is counted
The volume that reticle counts decided the careful rate of image, be similar to resolution. Common line number applies as follows:
10-120 line: Low character pressworks, remote the sheet with the older area ratio such as watched placard, handbill, paper of general use newspaper, hectograph will presswork, also use low gram number sometimes inferior powdery paper and art paper.
150 lines: Common 4 kinds presswork to use this precision commonly, of all kinds paper has.
175 - 200 lines: Elegant an album of paintings, pictorial is waited a moment, most use art paper pressworks
250 - 300 lines: An album of paintings of top demand is waited a moment, majority pressworks with high-quality art paper and special type paper.
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