As a section for opening, the sewing machine eye is provided in the overlap width surface and the aspect of overlap width, when opening from with left and right which the opening possible specific envelope

摘要

Topic The instrument is not used and the specific envelope which from left and right makes opening simply possible regardless of righty and left-handedness, is offered.SolutionsIn order when overlap width of the envelope has been folded, to depend on the surface of overlap width, the sewing machine eye as a section for opening is provided. In addition, the sewing machine eye is provided together even in the place where 1 centimeters it is far parallel with the sewing machine eye of the surface. When opening by the fact that the opening place which was put to both sewing machine eye is pulled it becomes opening possible from with left and right whichever. Choice figure Drawing 3