Abstract: A chain saw guide bar with at least one internal channel for spraying the sawn surface with liquid through nozzles, where the channel is extended in front of the nozzles by an end portion terminated by a closeable cleaning hole with a larger section than the nozzles and usable for cleaning the channel with compressed air or liquid.

Abstract: A chain saw guide bar is formed of a middle plate and a pair of side plates affixed on opposite sides of the middle plate. One (or both) of the side plates carries nozzles for emitting liquid dyes of different respective colors. Channels for conducting liquid dyes to the respective nozzles are formed by grooves cut in the interface between the middle plate and a side plate. Each channel is surrounded by a laser weld which completely isolates the channels from one another to avoid mixing the colors. The laser welds also secure the middle and side plates together. Additional laser welds secure the middle and side plates together, the additional laser welds being discontinuous.