# US 6,296,389 B1 · Easy-to-open packing bag > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,296,389 B1 - Document ID: US6296389B1 - Status: Granted - Kind: B1 - Application number: 09/424,563 - Filed: 2000-02-24 - Granted: 2001-10-02 - Earliest claimed: 1998-03-25 - Assignees: Matsushita Electric Industrial Co., Ltd. - Inventors: Sadao Yamamoto; Shin Yamada; Kazutaka Manabe - Web page: https://patentgrep.com/patent/US6296389B1 ## CPC - B65D 75/5855: {Peelable seals} - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## 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. ## Claims ### Claim 1 An easy-to-open packing bag, comprising: a pair of rectangular-shaped packing films, each of which comprises a substrate layer and a thermoplastic resinous layer, said packing films being laminated on each other with surfaces of said thermoplastic resinous layers being opposed to each other; a U-shaped peripheral heat-bonding portion being formed on three other sides of said packing films; and a projected heat-bonding portion, connecting a pair of ends of said peripheral heat-bonding portion and projecting outwardly, formed on said packing films; wherein a predetermined region on one side of said packing films is formed as a non-heat-bonding portion; wherein at least said projected heat-bonding portion is separably sealed; and wherein a notch is formed on at least one of a pair of edges of an external one of the packing films at a position adjacent to one end of said peripheral heat-bonding portion. ### Claim 2 (depends on 1) The easy-to-open packing bag according to claim 1, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width. ### Claim 3 (depends on 1) The easy-to-open packing bag according to claim 1, wherein a heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 4 (depends on 1) The easy-to-open packing bag according to claim 1, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width, and wherein said heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 5 (depends on 1) The easy-to-open packing bag according to claim 1, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed. ### Claim 6 (depends on 1) The easy-to-open packing bag according to claim 1, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width. ### Claim 7 (depends on 1) The easy-to-open packing bag according to claim 1, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion of said packing film is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 8 (depends on 1) The easy-to-open packing bag according to claim 1, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion of said packing film is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width, and wherein said heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 9 An easy-to-open packing bag, comprising: a pair of rectangular-shaped packing films, each of which comprises a substrate layer and a thermoplastic resinous layer, said packing films being laminated on each other with surfaces of said thermoplastic resinous layers being opposed to each other; a U-shaped peripheral heat-bonding portion being formed on three other sides of said packing films; and a projected heat-bonding portion, connecting a pair of ends of said peripheral heat-bonding portion and projecting outwardly, formed on said packing films; wherein a predetermined region on one side of said packing films is formed as a non-heat-bonding portion; wherein at least said projected heat-bonding portion is separably sealed; wherein notches are respectively formed on a pair of edges of an external one of the packing films at a position adjacent to one end of said peripheral heat-bonding portion; and wherein as an operation to separate said packing films at the projected heat-bonding portion from each other proceeds, said external one of said packing films tears from one of said notches to the other of said notches, so that a part of said external one of said packing films can be cut off. ### Claim 10 (depends on 9) The easy-to-open packing bag according to claim 9, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width. ### Claim 11 (depends on 9) The easy-to-open packing bag according to claim 9, wherein a heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 12 (depends on 9) The easy-to-open packing bag according to claim 9, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width, and wherein said heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 13 (depends on 9) The easy-to-open packing bag according to claim 9, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed. ### Claim 14 (depends on 9) The easy-to-open packing bag according to claim 9, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width. ### Claim 15 (depends on 9) The easy-to-open packing bag according to claim 9, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion. ### Claim 16 (depends on 9) The easy-to-open packing bag according to claim 9, further comprising, for at least one of said packing films, a heat-bonding strength adjusting layer which is provided on a surface, of said thermoplastic resinous layer, corresponding to a region in which said projected heat-bonding portion is to be formed, wherein a heat-bonding strength of said projected heat-bonding portion is set to 500-2000 g per 15 mm width, and wherein said heat-bonding strength of said projected heat-bonding portion is set lower than that of said peripheral heat-bonding portion.