A mandrel's taper or angle for ease of part removal.
The degree of taper of a blister or clamshell sidewall to facilitate removal from the thermoforming mold and denesting of the blister.
The degree to which the sidewall of a blister or clamshell is tapered to smooth the progress of the removal from the thermoforming mold and denesting of the blister.
The angle of a taper on a mandrel or mold that facilitates removal of the finished part.
A "draft angle" is a term used to describe an item on a technical or engineering drawing.