This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/JP00/06363 which has an International filing date of Sep. 18, 2000, which designated the United States of America.
The present invention relates to a fastener bag capable of being easily opened and reclosed, and of being applied to packaging an article therein by an automatic filling and packaging machine, and a fastening device.
Recently, most packaging bags are required to have both a capability to be easily opened and a capability to be reclosed. The field of automatic filling and packaging, in which operations for filling and packaging an article in a packaging bag are carried out simultaneously, requests a fastener bag having both a capability to be opened and a capability to be reclosed.
A known fastener bag having both a capability to be opened and a capability to be reclosed is made by superposing two packaging sheets, heat-sealing peripheral parts of the superposed packaging sheets, attaching the male fastening member of a fastening device to the inner surface of one of the packaging sheets, and attaching the female fastening member of the fastening device to the inner surface of the other packaging sheet. The male and the female fastening member are disengaged to open the fastener bag, and are reengaged to reclose the fastener bag.
A known easy-to-open fastener bag is formed from a packaging material having a property of facilitating opening the fastener bag, another packaging bag is provided with a notch, and a third known fastener bag is provided with a filament attached to its component sheet.
Although the foregoing fastener bag has both a capability to be opened easily and a capability to be reclosed, a bag making process of making the fastener bag, a filling and packaging process need complicated work because the fastener bag is made by superposing the two packaging sheets and heat-sealing the peripheral parts of the packaging sheets. Particularly, automatic filling and packaging needs a complicated apparatus, requires troublesome work, and have significant problems in practical work.
The present invention has been made in view of the foregoing problems and it is therefore an object of the present invention to provide a fastener bag having both a capability to be opened easily and a capability to be reclosed, and capable of being used for automatic filling on an automatic filling and packaging machine, and to provide a fastening device.
According to a first aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in a butt seam; and a fastening device attached to the inner surface of the packaging bag; wherein the fastening device includes separate male and female fastening members, the male fastening member is disposed on one side of the heat-sealed butt seam of the packaging bag, the female fastening member is disposed on the other side of the heat-sealed butt seam of the packaging bag so as to be engage with the male fastening member, and a tear-facilitating means is extended between the male and the female fastening member.
According to a second aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in a butt seam; and a fastening device attached to a part of the inner surface of the packaging bag on one side of the heat-sealed butt seam; wherein the fastening device includes separate male and female fastening members, the male and the female fastening member are disposed with a space therebetween so as to be engaged, and a tear-facilitating means is interposed between the male and the female fastening member.
According to a third aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in a butt seam; and a fastening device attached to the inner surface of the packaging bag; wherein the fastening device is an integral molding including a male fastening member, a female fastening member and a connecting member, and a tear-facilitating means is combined with the connecting member.
According to a fourth aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in an envelope seam; and a fastening device attached to the inner surface of the packaging bag; wherein the fastening device is an integral molding including a male fastening member, a female fastening member and a connecting member, and a tear-facilitating means is combined with the connecting member.
According to a fifth aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in a butt seam; and a fastening device attached to the inner surface of the packaging bag; wherein the fastening device includes separate male and female fastening members, the male fastening member is disposed on one side of the heat-sealed butt seam of the packaging bag, the female fastening member is disposed on the other side of the heat-sealed butt seam so as to engage with the male fastening member, and a cut tape is extended from one to the other end of the packaging bag on a part of the inner surface of the packaging bag between the male and the female fastening member, and is attached to the inner surface of the packaging bag.
According to a sixth aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in a butt seam; and a fastening device attached to a part of the inner surface of the packaging bag on one side of the heat-sealed butt seam; wherein the fastening device includes separate male and female fastening members, the male and the female fastening member are disposed with a space therebetween so as to be engaged, and a cut tape is extended from one to the other end of the packaging bag on a part of the inner surface of the packaging bag between the male and the female fastening member, and is attached to the inner surface of the packaging bag.
According to a seventh aspect of the present invention, a fastener bag includes a packaging bag formed by heat-sealing side parts of a packaging sheet in an envelope seam; and a fastening device attached to the inner surface of the packaging bag; wherein the fastening device includes male and female fastening members, the male fastening member is disposed on one side of the heat-sealed envelope seam of the packaging bag, the female fastening member is disposed on the other side of the heat-sealed envelope seam of the packaging bag so as to be engaged with the male fastening member, and a cut tape is extended from one to the other end of the packaging bag on a part of the inner surface of the packaging bag between the male and the female fastening member, and is attached to the inner surface of the packaging bag.
According to an eighth aspect of the present invention, a fastening device includes separate male and female fastening members, wherein a linear member is combined with the male or the female fastening member.
Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Referring to
As shown in
Although it is preferably that the packaging sheet is a laminated film, the packaging sheet may be a single film.
Laminated films suitable as the packaging sheet for forming a transparent packaging bag 2 are a laminated film formed by laminating a 20 to 50 μm thick biaxially oriented polypropylene film, and a 20 to 60 μm thick nonoriented polypropylene film by a laminating process using a 2 to 3 μm thick dry bonding layer, a laminated film formed by laminating a 9 to 25 μm thick polyester film, and a 25 to 120 μm thick straight-chain, low-density polyethylene film by a laminating process using a 2 to 3 μm thick dry bonding layer, and a laminated film formed by laminating a 9 to 20 μm thick biaxial oriented nylon film, and a 25 to 120 μm thick polyethylene film by a laminating process using a 2 to 3 μm thick dry bonding layer. An extruded 12 to 20 μm thick polyethylene layer may be used as a bonding layer instead of the dry bonding layer.
Laminated films suitable as the packaging sheet for forming an opaque packaging bag 2 are a laminated film formed by laminating a 9 to 25 μm thick polyester film, a 6 to 30 μm thick aluminum foil, and a 20 to 120 μm thick straight-chain low-density polyethylene film by a laminating process using a 2 to 3 μm thick dry bonding layer, and a laminated film formed by laminating a 9 to 25 μm thick polyester film, a 12 μm thick aluminum-metallized polyester film, and a 20 to 60 μm thick nonoriented polypropylene film by a laminating process using a 2 to 3 μm thick dry bonding layer. A 12 to 20 μm thick extruded polyethylene layer may be used as a bonding layer instead of the dry bonding layer.
Referring to
The male fastening member 8 and the female fastening member 9 are formed by extruding an olefin resin, such as a polyethylene, a polypropylene or a copolymer of a polyethylene and a polypropylene by an extrusion molding machine. Although the male fastening member 8 and the female fastening member 9 shown in
As shown in
When opening the fastener bag 1, one end of the back sealed part 5 is held between fingers, the back sealed part 5 is pulled away from the surface of the fastener bag 1 to tear the laminated film along bends in the back sealed part provided with the roughened tear parts 10.
A method of manufacturing the fastener bag will be described.
A continuous laminated film is cut in a packaging sheet of a length equal to twice the sum of the width of the packaging bag 2 shown in
The side parts 4a and 4b are bent and are joined such that the inner surfaces thereof are contiguous to form a tubular structure. The roughened tear parts 10 formed in the packaging sheet extend along the bends of the side parts 4a and 4b.
Then, a continuous fastening device 3 with the male fastening member 8 and the female fastening member 9 engaged is inserted in the tubular structure such that the base part 8a of the male fastening member 8 is disposed on a part of the inner surface of the tubular structure on one side of the joint of the side parts 4a and 4b, and the base part 9a of the female fastening member 9 of the fastening device is disposed on a part of the inner surface of the tubular structure on the other side of the joint of the side parts 4a and 4b. Thus, the male fastening member 8 and the female fastening member 9 are disposed on the opposite sides of the joint of the side parts 4a and 4b, respectively.
Then, the joined side parts 4a and 4b of the tubular structure are bonded together by heat-sealing and, at the same time, the respective base parts 8a and 9a of the male fastening member 8 and the female fastening member 9 are welded or bonded to the inner surface of the tubular structure. Thus, the tubular structure having open opposite ends and provided with the fastening device 3 attached to its inner surface is formed.
Then, one end of the tubular structure fixedly provided with the fastening device 3 and having the opposite open ends is heat-sealed to form the lower heat-sealed part 7. Thus, the packaging bag 2 having an open upper end is obtained. An article is filled through the open upper end in the packaging bag 2, and then the upper end of the packaging bag 2 is heat-sealed to form the upper heat-sealed part 6. The packaging bag 2 filled with the article is cut along the upper heat-sealed part 6 to separate the packaging bag 2 from the packaging sheet.
Referring to
Although it is preferable that the tear strip 11 is made of a polymer different from that forming the packaging sheet and is, for example, a nylon monofilament or a metal wire, the tear strip 11 may be a cotton yarn or a silk yarn, provided that the tear strip 11 has a strength sufficient to tear both the base part 8a of the male fastening member 8 and the packaging sheet.
The male fastening member 8 and the female fastening member 9 of the fastening device 3a are formed by continuously extruding an olefin resin by an extrusion molding machine. The tear strip 11 can be combined with the male fastening member 8 or the female fastening member 9 by forming the tear strip 11 simultaneously with the male fastening member 8 or the female fastening member 9 by coextrusion.
As shown in
When opening the fastener bag 1a, the lower heat-sealed part 7 is cut along the cutting lines 12 to separate the pull tab 13 from the lower heat-sealed part 7, and then the pull tab 13 is held between fingers and is pulled away from the fastener bag 1a. Consequently, the tear strip 11 connected to the pull tab 13 cuts both the base part 8a of the male fastening member 8 and the packaging sheet to open the fastener bag 1a.
Whereas the fastener bag 1a shown in
The envelope seam type packaging bag 2b has an envelope seam 5a formed by superposing and joining together side parts of a packaging sheet. Laminated films suitable as the packaging sheet for forming the packaging bag 2b are a laminated film formed by laminating a 20 to 60 μm thick nonoriented polypropylene film, a 20 to 50 μm thick biaxially oriented polypropylene film, and a 20 to 60 μm thick nonoriented polypropylene film by a laminating process using a 2 to 3 μm thick dry bonding layer, a laminated film formed by laminating a 30 to 50 μm thick straight-chain low-density polyethylene film, a 9 to 25 μm thick polyester film, and a 25 to 120 μm thick straight-chain, low-density polyethylene film by a laminating process using a 2 to 3 μm thick dry bonding layer, and a laminated film formed by laminating a 25 to 60 μm thick polyethylene film, a 9 to 20 μm thick biaxial oriented nylon film, and a 25 to 120 μm thick polyethylene film by a laminating process using a 2 to 3 μm thick dry bonding layer. An extruded polyethylene layer may be used as a bonding layer instead of the dry bonding layer.
A fastening device 3c included in a fastener bag 1c shown in
The fastening device 3c and the tear strip 11 of the fastener bag 1c, similarly to the fastening device 3a and the tear strip 11 shown in
A fastener bag 1d shown in
A fastener bag 1e shown in
The cut tape is formed from, for example, a laminated film formed by sandwiching a 12 μm thick polyester film between 30 μm thick polyethylene films. The cut tape is formed in a width slightly smaller than the distance between the respective base parts 8a and 9a of the male fastening member 8 and the female fastening member 9 so that the cut tape is guided by the base part 8a of the male fastening member 8 or the base part 9a of the female fastening member 9 when cutting the packaging bag 2 with the cut tape.
Whereas the fastener bag 1e shown in
A fastener bag 1g shown in
The cut tape 100 of the fastener bag 1g is attached to a part of the inner surface of a packaging bag 2b between a base part 8a of a male fastening member 8 and a back sealed part 5 formed in the packaging bag 2g. The cut tape 100 serves as a tear-facilitating means for opening the packaging bag 2g. Two longitudinal cutting lines may be formed in the cut tape 100, and a part between the two cutting lines of the cut tape may be used as a tear-facilitating means.
The cut tape 100 has a width in the range of 3 to 15 mm. The cut tape 100 is extended continuously between an upper heat-sealed part 6 and a lower heat-sealed part 7 of the packaging bag 1g on a part of the packaging bag 2g between the male fastening member 8 and the female fastening member 9. A triangular pull tab is formed in at least either the upper heat-sealed part 6 or the lower heat-sealed part 7 by cutting lines. The cutting line separates a part of the heat-sealed part to form the pull tab integrally with the cut tape 100 at one end of the cut tape 100.
As shown in
A packaging sheet forming the packaging bag 2g has a breaking strength higher than the peeling strength of the easy-to-peel layer 103 of the cut tape 100.
The cut tape 10 may be a four-layer structure consisting of a low-density polyethylene layer, a polyester layer, a low-density polyethylene layer and an easy-to-peel layer, a four-layer structure consisting of a straight-chain low-density polyethylene layer, a polyester layer, a straight-chain low-density polyethylene layer and an easy-to-peel layer, a four-layer structure consisting of a very-low-density polyethylene layer, a polyester layer, a very-low-density polyethylene layer and an easy-to-peel layer or a four-layer structure consisting of a cast polypropylene layer, a polyester layer, a cast polypropylene layer and an easy-to-peel layer.
A method of manufacturing the fastener bag 1g will be described.
A continuous laminated film is cut in a packaging sheet of a length equal to twice the sum of the width of the packaging bag 2g shown in
Side parts 4a and 4b are bent and are joined such that the inner surfaces thereof are contiguous to form a tubular structure. Then, a continuous fastening device 3 with the male fastening member 8 and the female fastening member 9 engaged and the cut tape 100 are inserted in the tubular structure.
The male fastening member 8 and the female fastening member 9 are disposed on the opposite sides, respectively, of the joint of the side parts 4a and 4b. The cut tape 100 is extended continuously between the upper and the lower end of the tubular structure on a part between the base part 8a of the male fastening member 8 and the base part 9a of the female fastening member 9 of the tubular structure.
Then, the joined side parts 4a and 4b of the tubular structure are bonded together by heat-sealing to form the back sealed part 5 and, at the same time, the respective base parts 8a and 9a of the male fastening member 8 and the female fastening member 9 are welded or bonded to the inner surface of the tubular structure. Thus, the tubular structure having open opposite ends and provided with the fastening device 3 and the cut tape 100 attached to its inner surface is formed. The easy-to-peel layer 103 of the cut tape 100 is bonded to the base part 9a of the female fastening member 9.
Then, one end of the tubular structure fixedly provided with the fastening device 3 and the cut tape 100, and having the opposite open ends is heat-sealed to form a lower heat-sealed part 7. Thus, the packaging bag 2g having an open upper end is obtained. An article is filled through the open upper end in the packaging bag 2g, and then the upper end of the packaging bag 2g is heat-sealed to form the upper heat-sealed part 6. The packaging bag 2g filled with the article is cut along the upper heat-sealed part 6 to separate the packaging bag 2g from the packaging sheet.
When opening the fastener bag 1g to take out the contents, the upper heat-sealed part 6 or the lower heat-sealed part 7 is cut along the cutting lines to form a tab separated from the heat-sealed part.
Then, the tab is held between fingers and is pulled away from the surface of the fastener bag 1g to cut a part of the packaging bag 2g between the respective base parts 8a and 9a of the male fastening member 8 and the female fastening member 9 with the cut tape 100. Consequently, the fastener bag 1g is opened and the contents can be taken out of the fastener bag 1g through an opening formed by cutting the packaging bag 2g with the cutting tape 100.
The remnant contents remaining in the fastener bag 1g after taking out some of the contents can be sealed in the fastener bag 1g by engaging the male fastening member 8 and the female fastening member 9.
A fastener bag 1h in a preferred embodiment of the present invention shown in
In the fastener bag 1h, both the male fastening member 8 and the female fastening member 9 of the fastening device 3a are disposed on the inner surface of the packaging bag 2g shown in
A part of the fastener bag 1h apart from the back sealed part 5 is cut to open the fastener bag 1h.
A jip bag 1j in a preferred embodiment according to the present invention shown in
The fastener bag according to the present invention has the packaging bag formed by processing a single packaging sheet, the fastening device is disposed on one of the walls of the packaging bag, and the tear-facilitating means is placed on the inner surface of the packaging bag or the fastening device. Thus, the fastener bag can be opened and reclosed and can be used on an ordinary automatic filling and packaging machine without requiring any special devices.
The fastener bag according to the present invention has the packaging bag formed by processing a single packaging sheet, the fastening device is disposed on one of the walls of the packaging bag, and the cut tape is attached to the inner surface of the packaging bag. Thus, the fastener bag can be opened and reclosed and can be used on an ordinary automatic filling and packaging machine without requiring any special devices.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP00/06363 | 9/18/2000 | WO | 00 | 8/4/2003 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO02/22452 | 3/21/2002 | WO | A |
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