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what is the Burr (edge) in injection ?

Release time:2020-04-01
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Metal burr extending beyond the edge of the cut piece, view on the cut face (top) and from the bottom (bottom)

A burr is a raised edge or small piece of material remaining attached to a workpiece after a modification process.[1]

It is usually an unwanted piece of material and is removed with a deburring tool in a process called 'deburring'. Burrs are most commonly created by machining operations, such as grinding, drilling, milling, engraving or turning. It may be present in the form of a fine wire on the edge of a freshly sharpened tool or as a raised portion of a surface; this type of burr is commonly formed when a hammer strikes a surface. Deburring accounts for a significant portion of manufacturing costs.

In the printmaking technique of drypoint, burr, which gives a rich fuzzy quality to the engraved line, is highly desirable—the great problem with the drypoint medium is that the burr rapidly diminishes after as few as ten impressions are printed. 


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