Folding envelope

Abstract

Abstract PURPOSE:To obtain a folding envelope capable of being opened accurately by a method wherein a closing edge of each paper part of the envelope is perforated to make its separation possible and the sealing part of a first paper part is bonded separably to the surface of either a second paper part or a third paper part in a dot-like condition. CONSTITUTION:An envelope blank S is folded along scores 4 and 5 in such manner that a first paper part 1 and a second paper part 2 form the outer faces and the inner surface of the first paper part 1 and the outer surface of a third paper part 3 face each other. The first, second and third paper part 1, 2 and 3 are inseparably bonded together at their closing edges 8 and 9 oppo site each other with closing adhesive layers 14 opposite each other and a sealing edge 10 of the first paper part 1 and the outermost edge of the third paper part 3 are separably bonded together with a dot-like sealing adhesive layers 15 formed cross each other and overlapped. To open the envelope, the closing edges 8 and 9 are first cut off along perforations 6 and 7 and the sealing edge 10 of the first paper part 1 is then separated from the surface of the third paper part 3 by the progressive tear-off of the dot-like bonded parts.

Inventors

• 👤 Yoshikazu Kimura
• 👤 義和 木村

Bibliographic Details