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frisket
A frisket is any material that protects areas of a work from unintended change.〔http://www.merriam-webster.com/dictionary/frisket〕
==Letterpress==
On a sheet-fed letterpress printing machine, a frisket is a sheet of oiled paper that covers the space between the type or ''cuts'' (illustrations) and the edge of the paper that is to be printed. When the press operator uses a brayer to coat the surface of the type with ink, the ink brayer will often coat the ''furniture'' and ''slugs'' (wood and metal spacers) between the columns and around the type. To keep this ink from touching the target sheet, the frisket covers the area that is not desired to print. The frisket is set in a frame, often hinged to the tympan that holds the paper in place.
A new frisket has to be cut for each different page or form; a well-made frisket lasts for hundreds or thousands of impressions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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