US20070116388A1

Movatterモバイル変換

Info

Publication number: US20070116388A1
Application number: US11/648,805
Authority: US
Inventors: Raizo Kuge; Sho Obara; Yuichi Oki
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-04
Filing date: 2007-01-03
Publication date: 2007-05-24

Abstract

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. The fastening device includes a male fastening member and a female fastening member. The male fastening member is disposed on one side of the heat-sealed butt seam of the packaging bag, and 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 interposed between the male and the female fastening member. The fastener bag is capable of being opened and of being reclosed, and is suitable for use on an automatic filling and packaging machine.

Description

This application is a Divisional of co-pending application Ser. No. 10/380,677 filed Aug. 4, 2003. The entire contents of all are hereby incorporated by reference.

TECHNICAL FIELD

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.

BACKGROUND ART

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 close 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.

DISCLOSURE OF THE INVENTION

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.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a rear view of a fastener bag in a first embodiment according to the present invention;

FIG. 2 is an enlarged sectional view of the fastener bag shown inFIG. 1;

FIG. 3 is a rear view of a fastener bag in a second embodiment according to the present invention;

FIG. 4 is an enlarged sectional view of the fastener bag shown inFIG. 3;

FIG. 5 is an enlarged sectional view of a fastener bag in a third embodiment according to the present invention;

FIG. 6 is an enlarged, sectional, perspective view of a fastener bag in a fourth embodiment according to the present invention;

FIG. 7 is an enlarged sectional view of a fastener bag in a fifth embodiment according to the present invention;

FIG. 8 is an enlarged sectional view of a fastener bag in a sixth embodiment according to the present invention;

FIG. 9 is an enlarged sectional view of a fastener bag in a seventh embodiment according to the present invention;

FIG. 10 is an enlarged sectional view of a fastener bag in an eighth embodiment according to the present invention;

FIG. 11 is a fragmentary sectional view of a cut tape;

FIG. 12 is an enlarged sectional view of a fastener bag in a ninth embodiment according to the present invention; and

FIG. 13 is an enlarged sectional view of a fastener bag in a tenth embodiment according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring toFIG. 1, afastener bag1 in a first embodiment according to the present invention includes apackaging bag2, and afastening device3 welded or bonded to the inner surface of thepackaging bag2.

As shown inFIGS. 1 and 2, thepackaging bag2 is formed by folding

side parts

4aand4bof a rectangular packaging sheet, joining the folded

side parts

4aand4bsuch that the inner surfaces thereof are contiguous, heat-sealing the thus joined folded

side parts

4aand4bto form a tubular structure having a back sealedpart5, and heat-sealing the upper and the lower end of the tubular structure to form an upper sealedpart6 and a lower sealedpart7.

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 atransparent packaging bag2 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 anopaque packaging bag2 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 toFIG. 2, thefastening device3 includes a separatemale fastening member8 and a separatefemale fastening member9. Themale fastening member8 has abase part8aattached to a part of the inner surface of thepackaging bag2 on one side of the back sealedpart5. Thefemale fastening member9 has abase part9aattached to a part of the inner surface of thepackaging bag2 on the other side of the back sealedpart5.

Themale fastening member8 and thefemale fastening member9 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 themale fastening member8 and thefemale fastening member9 shown inFIG. 2 have each a single engaging part, the same may be provided with two or more engaging parts when necessary.

As shown inFIG. 2, thepackaging bag2 is provided with narrow roughenedtear parts10 in the outer surface of the laminated film forming thepackaging bag2. The narrow roughenedtear parts10 are formed along the back sealedpart5. The roughenedtear parts10 are those provided with scratches not penetrating the laminated film formed by pressing a sand paper against the laminated film. The roughenedtear parts10 are the tear-facilitating means of the packaging bag.

When opening thefastener bag1, one end of the back sealedpart5 is held between fingers, the back sealedpart5 is pulled away from the surface of thefastener bag1 to tear the laminated film along bends in the back sealed part provided with the roughenedtear parts10.

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 thepackaging bag2 shown inFIG. 1 and the length of the back sealedpart5 of thepackaging bag2 to form thepackaging bag2 that can be used on an automatic filling and packaging machine. When folding the packaging sheet to form thepackaging bag2, at least one of the

side parts

4aand4bjoined by heat-sealing to form the back sealedpart5 is provided with the roughenedtear part10. Preferably, both the side parts are provided with the roughened tear parts, respectively.

The

side parts

4aand4bare bent and are joined such that the inner surfaces thereof are contiguous to form a tubular structure. The roughenedtear parts10 formed in the packaging sheet extend along the bends of the

side parts

4aand4b.

Then, acontinuous fastening device3 with themale fastening member8 and thefemale fastening member9 engaged is inserted in the tubular structure such that thebase part8aof themale fastening member8 is disposed on a part of the inner surface of the tubular structure on one side of the joint of the

side parts

4aand4b, and thebase part9aof thefemale fastening member9 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

4aand4b. Thus, themale fastening member8 and thefemale fastening member9 are disposed on the opposite sides of the joint of the

side parts

4aand4b, respectively.

Then, the joined

side parts

4aand4bof the tubular structure are bonded together by heat-sealing and, at the same time, the

respective base parts

8aand9aof themale fastening member8 and thefemale fastening member9 are welded or bonded to the inner surface of the tubular structure. Thus, the tubular structure having open opposite ends and provided with thefastening device3 attached to its inner surface is formed.

Then, one end of the tubular structure fixedly provided with thefastening device3 and having the opposite open ends is heat-sealed to form the lower heat-sealedpart7. Thus, thepackaging bag2 having an open upper end is obtained. An article is filled through the open upper end in thepackaging bag2, and then the upper end of thepackaging bag2 is heat-sealed to form the upper heat-sealedpart6. Thepackaging bag2 filled with the article is cut along the upper heat-sealedpart6 to separate thepackaging bag2 from the packaging sheet.

FIGS. 3 and 4 show a fastener bag1ain a second embodiment according to the present invention. The fastener bag1ashown inFIGS. 3 and 4 differs from thefastener bag1 shown inFIGS. 1 and 2 in that the fastener bag1ais provided with a tear strip11 as a tear-facilitating means combined with afastening device3ainstead of the roughenedtear parts10 of thefastener bag1 shown inFIGS. 1 and 2.

Referring toFIG. 4, thefastening device3aincludes a separatemale fastening member8 and a separatefemale fastening member9. The tear strip11 is attached temporarily to the inner surface of the base part of themale fastening member8 by welding or bonding. The tear strip11 may be attached temporarily to the outer surface of thebase part8aof themale fastening member8. When the tear strip11 is attached to the outer surface of thebase part8a, the respective positions of themale fastening member8 and thefemale fastening member9 on apackaging bag2 are interchanged.

Although it is preferable that the tear strip11 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 strip11 may be a cotton yarn or a silk yarn, provided that the tear strip11 has a strength sufficient to tear both thebase part8aof themale fastening member8 and the packaging sheet.

Themale fastening member8 and thefemale fastening member9 of thefastening device3aare formed by continuously extruding an olefin resin by an extrusion molding machine. The tear strip11 can be combined with themale fastening member8 or thefemale fastening member9 by forming the tear strip11 simultaneously with themale fastening member8 or thefemale fastening member9 by coextrusion.

As shown inFIG. 3, thefastening device3aand the tear strip11 are extended continuously between the upper and the lower end of the fastener bag1a. Atriangular pull tab13 is formed by cuttinglines12 in a lower heat-sealedpart7 at a position corresponding to the tear strip11 and an end of the tear strip11 is connected to thepull tab13.

When opening the fastener bag1a, the lower heat-sealedpart7 is cut along thecutting lines12 to separate thepull tab13 from the lower heat-sealedpart7, and then thepull tab13 is held between fingers and is pulled away from the fastener bag1a. Consequently, the tear strip11 connected to thepull tab13 cuts both thebase part8aof themale fastening member8 and the packaging sheet to open the fastener bag1a.

Whereas the fastener bag1ashown inFIG. 4 has the butt seam type packaging bag2a, a fastener bag1bshown inFIG. 5 has an envelope seamtype packaging bag2b.

The envelope seamtype packaging bag2bhas anenvelope seam5aformed by superposing and joining together side parts of a packaging sheet. Laminated films suitable as the packaging sheet for forming thepackaging bag2bare 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.

Afastening device3cincluded in a fastener bag1cshown inFIG. 6 is different in construction from that included in the fastener bag1bshown inFIG. 5. The fastening device1cshown inFIG. 6 is a molding integrally having amale fastening member8, afemale fastening member9, and a connectingpart14 interconnecting themale fastening member8 and thefemale fastening member9. A tear strip11, i.e., a tear-facilitating means, is attached to the inner surface of the connectingpart14.

Thefastening device3cand the tear strip11 of the fastener bag1c, similarly to thefastening device3aand the tear strip11 shown inFIG. 2, are extended between the upper and the lower end of apackaging bag2, a triangular pull tab is formed by cutting lines in a lower heat-sealed part and an end of the tear strip11 is connected to the pull tab.

A fastener bag1dshown inFIG. 7 differs from thefastener bag1 shown inFIG. 2 in that afastening device3 is extended on the inner surface of apackaging bag2 along abutt seam5 on one side of thebutt seam5, aridge12 extending along thefastening device3 is formed in a part of thepackaging bag2 between abase part8aof amal fastening member8, and abase part9aof afemale fastening member9, and roughenedtear parts10a, i.e., tear-facilitating means, are formed at the root of theridge12.

A fastener bag1eshown inFIG. 8 is not provided with any part corresponding to theridge12 of thepackaging bag2 of the fastener bag1dshown inFIG. 7, and is provided with afastening device3ainstead of thefastening device3. In the fastener bag1eshown inFIG. 8, a part of thepackaging bag2 between abase part8aof amale fastening member8, and abase part9aof afemale fastening member9 is cut with a tear strip11. Although the fastener bag1eshown inFIG. 8 employs the tear strip11 as a cutting means for cutting thepackaging bag2, the tear strip11 may be omitted, and a tape may be welded or bonded to a part of the inner surface of thepackaging bag2 between thebase part8aof the male fastening member, and thebase part9aof thefemale fastening member9 or a narrow roughened tear part may be formed near the

respective base parts

8aand9aof themale fastening member8 and thefemale fastening member9, and a cut tape or the narrow roughened tear part may be torn to open thepackaging bag2.

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

8aand9aof themale fastening member8 and thefemale fastening member9 so that the cut tape is guided by thebase part8aof themale fastening member8 or thebase part9aof thefemale fastening member9 when cutting thepackaging bag2 with the cut tape.

Whereas the fastener bag1eshown inFIG. 8 has the butt seamtype packaging bag2, a fastener bag1fshown inFIG. 9 has an envelope seamtype packaging bag2b.

A fastener bag1gshown inFIG. 10 is provided with acut tape100 as a tear-facilitating means instead of the roughenedtear part10 of thefastener bag1 shown inFIG. 2.

Thecut tape100 of the fastener bag1gis attached to a part of the inner surface of apackaging bag2bbetween abase part8aof amale fastening member8 and a back sealedpart5 formed in thepackaging bag2g. Thecut tape100 serves as a tear-facilitating means for opening thepackaging bag2g. Two longitudinal cutting lines may be formed in thecut tape100, and a part between the two cutting lines of the cut tape may be used as a tear-facilitating means.

Thecut tape100 has a width in the range of 3 to 15 mm. Thecut tape100 is extended continuously between an upper heat-sealedpart6 and a lower heat-sealedpart7 of the packaging bag1gon a part of thepackaging bag2gbetween themale fastening member8 and thefemale fastening member9. A triangular pull tab is formed in at least either the upper heat-sealedpart6 or the lower heat-sealedpart7 by cutting lines. The cutting line separates a part of the heat-sealed part to form the pull tab integrally with thecut tape100 at one end of thecut tape100.

As shown inFIG. 11, thecut tape100 is a three-layer structure consisting of a straight-chain low-density polyethylene layer101, apolyester layer102, and an easy-to-peel layer103. The easy-to-peel layer103 is formed of a chlorinated polyethylene or an EVA, or is a hot-melt layer. The easy-to-peel layer103 has a peeling strength on the order of 200 g/cm.

A packaging sheet forming thepackaging bag2ghas a breaking strength higher than the peeling strength of the easy-to-peel layer103 of thecut tape100.

Thecut tape100 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 bag1gwill be described.

A continuous laminated film is cut in a packaging sheet of a length equal to twice the sum of the width of thepackaging bag2gshown inFIG. 10 and the length of the back sealedpart5 of thepackaging bag2gto form thepackaging bag2gthat can be used on an automatic filling and packaging machine.

Side parts

4aand4bare bent and are joined such that the inner surfaces thereof are contiguous to form a tubular structure. Then, acontinuous fastening device3 with themale fastening member8 and thefemale fastening member9 engaged and thecut tape100 are inserted in the tubular structure.

Themale fastening member8 and thefemale fastening member9 are disposed on the opposite sides, respectively, of the joint of the

side parts

4aand4b. Thecut tape100 is extended continuously between the upper and the lower end of the tubular structure on a part between thebase part8aof themale fastening member8 and thebase part9aof thefemale fastening member9 of the tubular structure.

Then, the joined

side parts

4aand4bof the tubular structure are bonded together by heat-sealing to form the back sealedpart5 and, at the same time, the

respective base parts

8aand9aof themale fastening member8 and thefemale fastening member9 are welded or bonded to the inner surface of the tubular structure. Thus, the tubular structure having open opposite ends and provided with thefastening device3 and thecut tape100 attached to its inner surface is formed. The easy-to-peel layer103 of thecut tape100 is bonded to thebase part9aof thefemale fastening member9.

Then, one end of the tubular structure fixedly provided with thefastening device3 and thecut tape100, and having the opposite open ends is heat-sealed to form a lower heat-sealedpart7. Thus, thepackaging bag2ghaving an open upper end is obtained. An article is filled through the open upper end in thepackaging bag2g, and then the upper end of thepackaging bag2gis heat-sealed to form the upper heat-sealedpart6. Thepackaging bag2gfilled with the article is cut along the upper heat-sealedpart6 to separate thepackaging bag2gfrom the packaging sheet.

When opening the fastener bag1gto take out the contents, the upper heat-sealedpart6 or the lower heat-sealedpart7 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 bag1gto cut a part of thepackaging bag2gbetween the

respective base parts

8aand9aof themale fastening member8 and thefemale fastening member9 with thecut tape100. Consequently, the fastener bag1gis opened and the contents can be taken out of the fastener bag1gthrough an opening formed by cutting thepackaging bag2gwith the cuttingtape100.

The remnant contents remaining in the fastener bag1gafter taking out some of the contents can be sealed in the fastener bag1gby engaging themale fastening member8 and thefemale fastening member9.

A fastener bag1hin a preferred embodiment of the present invention shown inFIG. 12 has apackaging bag2hidentical with thepackaging bag2gof the fastener bag1gshown inFIG. 10. The fastener bag1hdiffers in the position of itsfastening device3afrom the fastener bag1gshown inFIG. 10.

In the fastener bag1h, both themale fastening member8 and thefemale fastening member9 of thefastening device3aare disposed on the inner surface of thepackaging bag2gshown inFIG. 10 on one side of the back sealedpart5.

A part of the fastener bag1hapart from the back sealedpart5 is cut to open the fastener bag1h.

A jip bag1jin a preferred embodiment according to the present invention shown inFIG. 13 is identical in the position of itsfastening device3 with the fastener bag1gshown inFIG. 10. Where as thepackaging bag2gof the fastener bag1gis of a butt seam type, the packaging bag2jof the fastener bag1jis of an envelope seam type.

INDUSTRIAL APPLICABILITY

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.

Claims

1. A fastener bag comprising:

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.

2. The fastener bag according toclaim 1, wherein the tear-facilitating means is a narrow easy-to tear part formed in the packaging bag.