Abstract: The present invention relates to a process for polymerising lactide into polylactic acid. The present invention also relates to reactor configuration for polymerising lactide into polylactic acid.

Abstract: A device (1) for indicating loosening of a rotary element (2) of a screw-and-nut system, this rotary element being intended to be screwed by a movement in rotation about a longitudinal direction (D), said rotary element comprising a portion of polygonal section in a plane normal to the longitudinal direction, said polygonal section portion defining a plurality of plane faces (21, 22, 23, 24, 25, 26), said indicator device comprising a body (3) intended to be mounted on the rotary element, a marking element (4) extending radially, fastened to the body to indicate the angular position of the rotary element, and at least one spring (31, 32, 33, 34, 35, 36) fastened to the body so that when the body is mounted on the polygonal section portion each spring exerts a radial bearing force on a corresponding plane face of the rotary element.