Patent Number: 6,296,389

Title: Easy-to-open packing bag

Abstract: A packing bag is easy to open and allows an end of an content to be easily exposed to the outside by separating heat-bonding portions of external an internal packing films from each other and tearing the external packing film. The packing bag includes two rectangular packing films each having a thermoplastic resinous layer formed on its inner surface. The external and internal packing films are laminated on each other, with surfaces of the thermoplastic resinous layers opposed to each other, a predetermined region extending inward from one side of each of the packing films is formed as a non-bonding portion; a U-shaped peripheral heat-bonding portion is formed on each of the packing films along other three sides thereof, a projected heat-bonding portion connecting both ends of the peripheral heat-bonding portion with each other and projected outward is formed; at least the projected heat-bonding portion is separable; and a notch is formed on at least one edge of an external one of the packing films such that the notch is located at a position adjacent to one end of the peripheral heat-bonding portion.

Inventors: Yamamoto; Sadao (Saijo, JP), Yamada; Shin (Shinjuku-ku, JP), Manabe; Kazutaka (Shinjuku-ku, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: B65D 75/58 (20060101); B65D 75/52 (20060101); B65D 033/00 ()

Expiration Date: 10/02/2018