Patent ID: 9296520
Filing Date: 2016-03-29
CPC Classification: B43M,B65D

Claim Text:
1. An envelope sheet used when manufacturing an envelope, comprising: n (where n is an integer of three or more) rectangular component sheets adjacently aligned in an envelope unfolding direction; and (n−1) folding lines for consecutively connecting the n component sheets along the envelope unfolding direction, wherein each folding line consecutively connects adjacent component sheets and extends in an orthogonal direction that is orthogonal to the envelope unfolding direction, wherein a first component sheet serves as a front sheet or a back sheet of the envelope, a second component sheet serves as a back sheet or a front sheet of the envelope, the first component sheet has an openable and closable flap on one end side extending in the envelope unfolding direction, a first coating part and a second coating part coated with pressure-sensitive adhesive are provided on an envelope inner side and respectively extend along the envelope unfolding direction on fringes of the first component sheet, the second component sheet, and a third component sheet, and another coating part coated with another adhesive provided on an envelope outer side of the third component sheet for closing the flap, the another coating part extends along the orthogonal direction and contacts the flap but not an adhesive when the envelope sheet is folded along the second folding line, wherein a first cutout part and a second cutout part extend in the envelope unfolding direction, and are respectively provided on fringes of the third component sheet, the first coating part and the second coating part on the third component sheet are bonded to a part of the first coating part and a part of the second coating part on the second component sheet when the envelope sheet is folded along the second folding line, and the first coating part and the second coating part on the first component sheet are bonded to a remaining part of the first coating part and a remaining part of the second coating part on the second component sheet via the first cutout part and the second cutout part on the third component sheet when the envelope sheet is folded along the first folding line.