| 摘要 |
The printing element has the shape of a propeller. All printing elements of a printing dot have S-shaped and equally large sides all around. The clearings between adjacent printing elements have a constant width around a printing element. Due to said configuration, it is possible to mirror the printing element around a central axis while preserving the form of a printing element in such a way that only round corners are obtained since sharp corners would provoke an unstable image causing moiré effects. Said printing element form is particularly useful in four-color printing.
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