JP2000085792A - Paper bag with unsealing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper bag with unsealing function comprising a liner sheet with a tear-open tape stuck to an internal face for surrounding and fixing a folded end of a bag body wherein while the paper bag includes easiness in unsealing similar to conventional ones, the tear-open tape may not be cut off from the liner sheet at the time of unsealing so that it may not be mixed into contents as a scrap. SOLUTION: A liner sheet 15 is placed across a folded end which has been closed by folding an end of a paper bag body 11 formed to be cylindrical, respective ends of the liner sheet 15 are stuck to both wall faces of the paper bag body 11 to form an unsealable closed end 17 which is to be unsealed for removing contents in the future. In the paper bag 10 with unsealing function formed with the closed end 17, a paper strip with a longer width size than a wall face width of the paper bag body 11 comprising a tear-open tape 14 stuck to a rear face so that it extends over a full width is used to form the liner sheet 15 in approximately the same width as the wall face of the paper bag body 11 by folding an end of the paper strip toward the rear face, and at the other end of the liner sheet 15, tab forming cuts 18 cut along both sides of an end of the tear-open tape 14 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper bag having an opening function, and more particularly, to a paper bag body formed in a cylindrical shape, one end of which is folded and a closed end portion is surrounded and fixed by a backing sheet with an opening tape. To a paper bag with an opening function.

[0002]

2. Description of the Related Art Conventionally, a paper bag with an opening function has been constructed in such a manner that one end of a cylindrical paper bag body made of kraft paper has at least two ends.
Fold it so that it rolls over more than once, place a backing sheet with an opening tape over the bent end, and glue each end of the backing sheet with the opening tape to both wall surfaces of the paper bag body with an adhesive. The bent end was surrounded and fixed to form a bottom closure.

[0003] By the way, this backing paper with an opening tape is a paper piece having a width substantially equal to the width of the wall surface of the paper bag main body, and is divided into approximately three-thirds in the longitudinal direction thereof, and is approximately two-thirds in one side. Then, a thin tape (opening tape) made of a synthetic resin is stretched over the entire width and attached to the tape.

[0004] As a specific method of attaching such a backing sheet with an opening tape to the bent end portion of the paper bag body, the backing sheet with the opening tape is lengthened so that the side to which the opening tape is adhered faces inside. Fold it along the line about two-thirds of the way. And it arrange | positions over the said bending edge part so that the one side area | region surface to which the opening tape was stuck may be located in the bending side of the bending edge part in a paper bag main body.

[0005] Finally, each end side of the backing paper with the opening tape is adhered and fixed to each wall surface of the paper bag main body with an adhesive, thereby surrounding and fixing the bent end portion of the paper bag main body and the bottom closed portion of the paper bag. I do. The mouth side of such a paper bag is usually open to put contents, but for example, a hot melt adhesive is applied so that the mouth can be easily closed after filling the contents.

[0006] After the contents are filled into the paper bag with the opening function from the mouth and the mouth is closed, when the contents are to be taken out in the future, the paper bag with the opening function is turned upside down and the bottom part is set up. With the closing part positioned at the top or lying on its side, one end of the opening tape is picked up from one side of the backing paper with the opening tape and pulled up toward the other end.

[0007] Thus, the tearing tape is removed while tearing the backing paper along both side edges of the tearing tape. As a result, the folded end of the paper bag main body is released by the backing paper with the opening tape, and the folded end is folded back to open the bottom closing portion of the paper bag with the opening function to take out the contents.

[0008] A paper bag with an opening function having a structure in which the folded end of the paper bag body is surrounded and fixed by the backing paper with the opening tape to form a closed bottom portion is called a kraft paper bag (Easy Pack). It is widely used in a wide range of fields (paper bags mainly made of kraft paper).

[0009] This is very easy to open because of its simple structure. Particularly, in the case of a backing paper with an opening tape, the fiber orientation direction of the basic paper piece and the extending direction of the opening tape are made to be the same. Thus, it is considered that a great advantage that the opening tape can be relatively easily opened without a large force when pulling up the opening tape and tearing the backing paper is also considered to have contributed.

[0010]

However, this excellent paper bag with an opening function is not without problems. That is a problem that occurs when opening such a paper bag with an opening function. That is, when opening the paper bag with the opening function, as described above, one end of the opening tape adhered to the backing sheet is picked up and strongly pulled in the direction of the other end, so that the backing sheet is closed. It is torn over its entire width along both side edges, resulting in a cut-out in the backing paper with a groove width approximately equal to or slightly greater than the width of the tear tape.

In other words, in the related art, when the paper bag with the opening function is opened, the restraining of the bent end portion of the paper bag main body is released by tearing the backing paper in the entire width direction by the opening tape. The problem is here. There is a problem that the opening tape completely separated and removed in order to form a groove-shaped separation portion in the backing paper enters the contents discharged from the paper bag due to a mistake such as forgetting to discard.

[0012] The number of such packaging bags handled in the distribution industry and the like is extremely large, and generally, it cannot take much time to open one packaging bag. Therefore, if many packaging bags are opened in a short period of time, there is a risk that the opening tape after cutting and removal, which is a swarf, may accidentally enter inside the contents taken out of the paper bag during the operation. If the opening tape after cutting and removing enters the contents taken out of the paper bag in this way, the packaging bag filled with the contents may have been contaminated with foreign matter, which is a major problem. Become.

[0013] Incidentally, as one opening method for preventing chips of the opened opening tape from entering into the contents taken out of the paper bag at the time of opening and causing foreign matter to enter, the opening tape is completely removed from the backing paper. In order to prevent this, the tearing-off operation is interrupted by slowly pulling up the opening tape and tearing the backing sheet, and at the last slightly remaining portion (immediately before completely removing the backing sheet).

Then, in the remaining portion which has not yet been torn, it is connected (connected) to the cut-off portion only along one of the side edges of the opening tape.
A method of breaking in the width direction can be considered.

However, this method is rather
It is extremely difficult to open a large number of packaging bags in a short time, as described above, only by requiring the opening person to be careful in lifting and removing the opening tape. In particular, in order to pull up the opening tape and tear the backing paper, a certain amount of force is used to pull up the opening tape from the backing paper, so that it is difficult in terms of working technology to stop it at the end.

[0016] Therefore, in this kind of paper bag with an opening function, the opening function has the conventional performance, but, for example, a paper bag is used so that the opening tape chips after opening do not enter the contents removed from the paper bag. There has been a need for a device that keeps the user from leaving (a state in which the paper bag or the backing paper is connected).

An object of the present invention is to solve such a conventional problem, and has an opening function in which a folded end portion of a paper bag body is surrounded and fixed by a backing sheet having an opening tape adhered to an inner surface thereof. Provided is a paper bag having an opening function in which the paper bag has the same ease of opening as before, but the opening tape does not separate from the backing paper at the time of opening, and there is no danger that it will become chips and mix into the contents. It is in.

[0018]

According to the present invention, a backing paper is arranged so as to straddle a closed end of a paper bag body formed by bending one end of a tubular paper bag body. A paper bag with an opening function, wherein each end side of the paper bag is attached to both wall surfaces of the paper bag body to form an openable closed end which is opened for taking out the contents in the future. A paper piece having a width dimension longer than the wall width of the paper bag main body attached to the back surface so as to extend over the entire width is used, and one side of this paper piece is bent to the back side to have substantially the same width as the wall surface of the paper bag main body. On the other side of the backing paper, a notch for forming a knob portion cut along both sides of the end portion of the opening tape is formed, and a bent piece bent to the back side is formed. One cutout is formed along the edge of the tear tape. Further bent end portion of the paper bag body surrounded fixed against paper, characterized in that it is constructed by bending at least twice as engulf.

In the paper bag with an opening function according to the present invention,
In addition to the above-described features, an adhesive for bonding each end side of the backing sheet to both wall surfaces of the paper bag body is provided at least in the area of the surface where the opening tape is provided by the folding of the backing sheet. An adhesive non-applied portion is provided at an appropriate distance from a substantially edge of the bent piece toward the center of the paper bag body.

Further, in the paper bag with an opening function according to the present invention,
The end of the surface area of the backing sheet on which the opening tape is provided is attached to the outer layer surface of the paper bag body to be adhered at least over the adhesive application width and substantially at the edge of the folded piece of the backing sheet. It is characterized in that parallel cuts are provided.

According to such a paper bag with an opening function, when the paper bag is to be opened to take out the contents,
Holding the tab of the opening tape formed on one side of the backing sheet, tearing the backing sheet while pulling it toward the other side. When the tearing tape is pulled up to the other side by pulling up the tearing tape, the tearing tape is continuous with the tape part attached to the folded piece bent inward from the other side of the tearing paper, and its continuous state Is in a straight line.

That is, to grip the end of the opening tape from one side of the backing paper and pull it up toward the other side,
Since the tearing tape is turned over so as to expose the surface of the opening tape stuck to the inner surface of the backing sheet, the tearing part is formed at an acute angle between the backing sheet and the lifted opening tape, in other words, the bending angle of the opening tape. Move continuously to the other side while maintaining

However, when the tearing portion reaches the other side of the backing sheet, the folded piece of the backing sheet is substantially turned over from there, so that the opening tape and the folded piece which have been lifted up to that point are still in contact. The bending angle between the tape and the end portion of the tape is obtuse, that is, 90 to 180 degrees. As a result, even if the opening tape that has been pulled up is pulled further, it cannot be easily cut off from the folded piece, and the tearing of the backing sheet stops here.

In this case, since the backing paper cannot be completely cut in the width direction, if a cutout portion is formed in this folded piece along one side of the opening tape, the folded piece is torn using the guide as a guide. As a result, the opening operation becomes easy. That is, when the tearing portion of the backing sheet is moved to the other side by picking up the end of the opening tape from one side of the backing sheet and pulling up in the direction of the other side, the separating cutout formed in the folded piece is turned off. If the folded end of the paper bag main body is lifted by using this as a guide to expose, the backing sheet is completely cut in the width direction, and the restraining of the folded end of the paper bag main body that has been fixed around is released.

However, the opening tape is still connected to the folded piece of the backing sheet, and this is not cut off by itself. Therefore, it does not fall as chips and is not mixed into the contents placed in the vicinity of the unsealing place, so that it is possible to avoid problems such as mixing of foreign substances.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a paper bag having an opening function according to the present invention. FIG. 1 is a plan view showing a paper bag 10 with an opening function according to an embodiment of the present invention in a flat state, and FIG. 2 is a paper bag 10 with an opening function in FIG.
FIG. 2 is a cross-sectional view schematically showing a cross section taken along line 2-2.

As shown in FIG. 3, the paper bag 10 having an opening function includes a tubular paper bag main body (hereinafter, simply referred to as a paper bag main body) 11 having both ends formed by step cutting.
This paper bag main body 11 is used as a basic component of a pinch bag, and the step-cut structure at both ends is formed completely symmetrically. That is, the step-cut structure at both ends of the paper bag main body 11 is exactly the same, but the directions of the step-cut surfaces are opposite.

The paper bag main body 11 is formed by forming a stepwise perforation in a direction crossing the paper sheet at a predetermined length position in a band-shaped paper wound on a roll, and continuously forming this into a cylindrical shape. After that, it can be formed by cutting at the perforation to form a tubular body, and stacking such a tubular body in, for example, two layers. Such a paper bag main body 11 is disclosed in, for example, Japanese Utility Model Publication No. 58-28977, and is well known, so that the detailed description thereof will be omitted.

The lower end portion of the paper bag main body 11 constituting the paper bag 10 having the opening function of this embodiment, which is to be opened in the future, is:
As shown in FIG. 3, a fold line h passing the step-cut end (flap 12) slightly outward from the innermost edge 11 a.
, And then bent once more along a fold line passing over the tip of the folded flap 12 to form a folded end 13.

That is, one end of the folded paper bag main body 11 formed in a tubular shape is bent into at least two times in a flat state so as to form a bent end portion 13. Then, as shown in FIG. 4, the backing paper 15 with the opening tape 14 attached to the inner surface is disposed so as to straddle the bent end portion 13.

Next, each end of the backing paper 15 with the opening tape is adhered to both wall surfaces of the paper bag main body 11 with an adhesive 16, thereby surrounding and fixing the bent end portion 13, and this portion is opened. It is a bottom closed portion 17 in the paper bag 10 with the attachment. The details of the backing paper with the opening tape are shown in FIG.
And in FIG.

The configuration of the backing sheet 15 with an opening tape will be described in more detail with reference to FIG.
Is a paper piece having a width dimension W2 longer than the wall width of the paper bag main body 11 assuming that the wall width of the paper bag body 11 is W1, and the inner surface of a two-third region 15b divided by a third line 15a in the length direction.
A thin tape (opening tape) 14 made of synthetic resin is stretched and attached over the entire width W2, and then one side (the right side in FIG. 5) of this paper piece is bent to the back side to form a bent piece 15c. The width W1 which is substantially the same as the wall of the paper bag body 11
It is formed by using

On the other side (left side in FIG. 5) of the backing paper 15, a notch forming notch 18 cut along both sides of the end of the opening tape 14 is formed. . Further, in this backing sheet 15, one cutout portion 19 is formed on the side edge 15d of the bent piece 15c bent to the back side along the end of the opening tape 14. As shown in FIG. 5, the cutout portion 19 formed on the folded piece 15 c of the backing sheet 15 is closer to the center of the backing sheet 15 than the opening tape 14 (the bending line 1).
5a).

As a specific method of attaching such an opening tape-attached paper 15 to the folded end portion 13 of the paper bag main body 11, as shown in FIG. Then, the backing sheet 15 with the opening tape is folded on a line 15a passing through a position about 2/3 in the length direction. Then, the one-side area 1 to which the opening tape 14 is attached
As shown in FIG. 4, the inner surface of 5b is placed across the bent end 13 so as to be located on the bent side of the bent end 13 in the paper bag body 11.

Finally, each end side of the backing paper 15 with the opening tape and the center near the opening tape 14 are attached to the paper bag body 11.
Is fixed to each wall surface with an adhesive 16, whereby the bent end 13 of the paper bag body 11 is surrounded and fixed. as a result,
The bent portion 13 is restrained in the bent state, and thus forms the bottom closing portion 17 of the paper bag 10 having the opening function.

Next, the mouth portion of the paper bag 10 having the opening function will be described. This mouth is not the gist of the present invention, but as shown in FIG. 7, the lowermost edge at the other end of the stepped section of the paper bag body 11 (the end of the outermost layer when the paper bag body has a plurality of layers). The entire stepped end outside the expected bending line 20 substantially along the edge 11b is defined as the flap 21 on the mouth side.

The flap 21 defined by the expected folding line 20 is folded at the expected folding line 20 and overlaps the wall surface of the paper bag body 10 (shown by a shadow line in FIG. 7). An adhesive sheet 22 is attached, and a release paper is attached to the surface of the double-sided adhesive sheet 22 (the release paper is peeled off when the flaps 21 are overlapped).

The double-sided adhesive sheet 22 with such release paper can be provided by cutting and attaching a commercially available double-sided adhesive tape having a predetermined width to the same width as the wall surface. When using the paper bag 10 with the opening function configured as described above, the contents are filled from the mouth of the paper bag, and then the release paper adhered to the surface of the double-sided adhesive sheet 22 is peeled off and the double-sided adhesive is applied. The pressure-sensitive adhesive layer of the sheet 22 is exposed, the flap 21 is folded down from the predetermined bending line 20, and the sheet is overlaid and stuck on the pressure-sensitive adhesive layer.

The adhesive layer is formed on the paper bag body 11 as described above.
Since the flap 21 is provided at an accurate area where the flap 21 is superimposed on the wall surface of the flap 21, that is, at an accurate position and an accurate size, if the flap 21 is bent from the expected bending line 20, no matter who goes, the adhesive layer is formed. It will be accurately superimposed and pasted without any error.

Next, a case will be described in which, after the contents are filled, the tightly sealed paper bag 10 having the opening function as described above is opened to take out the contents. When taking out the contents from the paper bag 10 having the opening function,
Is turned upside down to place the bottom closure 17 on top or lie down.

Thereafter, as shown in FIG. 8, a grip 14a formed by a grip forming notch 18 cut along one side of the opening tape 14 on one side of the backing paper 15 is held. The contact paper 15 is torn while being pulled up toward the other side. When the opening tape 14 is pulled up and the backing paper 15 is torn to the other side, the opening tape 14
Is in a straight line with the tape attached to the folded piece 15c which is bent inward from the other side of the backing paper 15.

That is, picking up the end 14a of the opening tape 14 from one side of the backing sheet 15 and pulling it up toward the other side means that as shown in FIG. The tearing portion 23 keeps the angle between the backing paper 15 and the lifted opening tape 14, in other words, the bending angle θ of the opening tape 14 at an acute angle. While continuously moving to the other side.

However, as shown in FIG. 9, when the tearing portion 23 reaches the other side of the backing sheet 15, the folded piece 15c of the backing sheet 15 is substantially turned over from there.
The bending angle θ is substantially zero or an obtuse angle (90 to 180) between the opening tape 14 pulled up to that time and the end portion of the tape still attached to the bent piece 15c.
Degree). As a result, even if the opening tape 14 pulled up to that point is further pulled, it cannot be easily cut off from the bent piece 15c, and the tearing of the backing paper 15 stops here.

However, since the cutout portion 19 is formed on the bent piece 15c along one side of the opening tape 14, the bent end portion of the paper bag body is lifted up (folded back) using this as a guide. Then, the backing paper 15 is completely cut in the width direction, whereby the restraint of the folded end portion 13 of the paper bag main body 11 that has been fixed around is released.

Even if the backing sheet 15 is completely cut in the width direction in this manner, the opening tape 14 is still in a state where one side thereof is still connected to the folded piece 15c of the backing sheet 15, and therefore, It does not cut off alone. Therefore, it does not fall as chips and is not mixed into the contents placed in the vicinity of the unsealing place, so that it is possible to avoid problems such as mixing of foreign substances.

The paper bag 10 with an opening function according to this embodiment
Then, the bent piece 15 of the backing paper 15 constituting this
c formed in the opening tape 1
Although it is formed closer to the center side of the backing sheet 15 than 4, it may be of course outside. The difference between the formation position of the cutout portion 19 for separation and the position closer to the center side or the outer side of the opening tape 14 depends on when the backing paper 15 is finally completely cut in the width direction. The difference is which side of the cut-off opening tape 14 is connected to the cut backing paper 15. Of course, such cut-out portions 19 may be provided on both sides of the opening tape 14.

If the cut-out notch 19 is formed near the center as described above, the opening tape 14 cut off until then is attached to the end of the cut one-side half region 15b of the backing paper 15. Therefore, when the folded end portion 13 of the paper bag main body 11 is folded back and opened thereafter, the cut-off opening tape 14 does not interfere.

Normally, the backing paper 15 is
As shown in FIG. 4, both ends (ends in the longitudinal direction of the paper bag main body) when the paper bag main body 11 is arranged over the bent end portion 13 and is fixed to the paper bag main body 11 with the adhesive 16 as shown in FIG. Is always adhered to the wall surface of the paper bag main body 11. More specifically, the opening tape 14 in the backing paper 15
The adhesive 16 is applied in a band shape on both sides of the unsealing tape 14 with the adhesive tape 16 sandwiched therebetween, and one of the adhesives 16 is applied in a band shape on the inner surface of the end of the one side region 15b. .

In the paper bag 10 with an opening function of the present invention, in order to further ensure the breakage of the backing paper 15 at the time of opening, a band-shaped coating is applied to the end of the one side area 15b to which the opening tape 14 is attached. The adhesive 16 to be applied is connected to the side edge 1 of the bent piece 15c which is bent rearward as shown in FIG.
It is preferable to provide an adhesive non-applied portion 24 at an appropriate interval where the adhesive layer is cut off in the width direction of the paper bag main body 11 with 5 d as a boundary.

The reason for providing such an adhesive non-applied portion 24 is as follows. That is, as described above, when the starting end of the opening tape 14 is pinched and the backing paper 15 is torn in a groove shape, the opening tape 14 may not always be broken in the straight line where the opening tape 14 is located. In most of the cases, as shown in FIG. 11, one edge of the groove-shaped cut-off portion by the opening tape 14 is diverted to the outside, the torn portion is enlarged, and reaches the bonding portion of the backing paper 15 described above. .

As described above, when the groove-shaped cut-off portion is enlarged and reaches the bonding portion of the backing paper 15, the adhesive is strong, so that the wall fiber layer of the paper bag main body 11 is torn and peeled. Then, even if the opening tape 14 stops at the folding line position of the folding piece 15c, this folding piece 15c
Since the surface fiber layer at the bonding portion between the paper bag body and the wall surface of the paper bag body is peeled off and removed, a part of the torn paper 15 that has been torn no longer has a fixed relationship with the paper bag body 11, and the paper bag body 1 as it is
It will come off from one.

On the other hand, with the side edge 15d of the bent piece 15c bent to the back side as a boundary, in the width direction of the paper bag main body,
If an adhesive non-applied portion 24 is provided at an appropriate interval where the layer of the adhesive 16 is interrupted, the edge of one side of the groove-shaped cut-off portion by the opening tape 14 is diverted to the outside, the torn portion is enlarged, Even if the wall fiber layer of the paper bag body 11 in the portion is torn while peeling, the peeling is interrupted at the adhesive non-applied portion 24 as shown in FIG.

As a result, when the edge on the other side of the cutout portion by the opening tape 14 reaches the bent portion of the bent piece 15c again, the opening tape 14 reverses its direction and continues to the bent piece 15c. As a result, the chips of the opening tape 14 that have been pulled up do not peel off the paper bag main body 11.

Further, in order to completely prevent peeling of the opening tape chips from the paper bag main body 11, as shown in FIG. 13, a backing paper 15 on which an opening tape 14 is adhered.
Is formed in the outer layer surface of the paper bag body 11 to which the end of one side region is bonded, at least exceeding the adhesive application width and substantially parallel to the side edge 15d of the folded piece 15c of the backing paper 15.
5 is also preferable.

If such cuts 25 are formed at predetermined positions on the outer layer surface of the paper bag main body 11 as described above, the cuts 25 cut off the fiber layer on the wall surface of the paper bag main body as shown in FIG. It is possible to prevent chips of the opened tape from peeling off the paper bag main body 11.

Of course, such a cut 25 must not be formed simultaneously with the above-described adhesive non-applied portion 24, and a considerable effect can be obtained by using the cut 25 alone without providing the adhesive non-applied portion 24. It goes without saying that it can be raised.

Further, in the paper bag 10 with the opening function according to this embodiment, the paper bag main body 11 is configured such that both ends are step-cut as is apparent from FIG. The configuration is not intended to be a purpose, and is not limited to such a configuration. Therefore, it goes without saying that the above-described operation and effect can be obtained even with a paper bag body formed by cutting both ends straight.

Further, regarding the backing paper with an opening tape,
It is conventional that the opening tape is stretched and attached in the same direction as the fiber orientation direction of the paper piece constituting the backing paper. In addition, regarding the mouth of the paper bag 10 with the opening function,
In the above-described embodiment, the double-sided adhesive sheet 22 is formed in a region where the flap 21 is bent and overlaps the wall surface of the paper bag body 11.
However, instead of such a double-sided adhesive sheet 22, a hot-melt adhesive is applied in advance to a surface to be bonded of a flap 21 widely used in a conventional pinch bag or the like. There may be.

Although the paper bag with an opening function according to each of the above-described embodiments has been described as using kraft paper as its material, the present invention is not limited to this material. It is needless to say that the present invention can also be applied to a paper bag having an opening function formed by using the above.

[0060]

As described above, according to the paper bag with the opening function of the present invention, the backing paper with the opening tape, which is disposed so as to straddle the bent end portion at one end portion of the paper bag body, is formed of the paper piece. One side is bent to the back side to have the same width as the wall surface of the paper bag body, and the other side is provided with a notch forming notch cut along both ends of the opening tape. Accordingly, the present invention provides a paper bag with an opening function in which the opening tape is not separated from the backing sheet at the time of opening while having the same ease of opening as before, and there is no possibility that the opening tape may be mixed with the contents as chips. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing a paper bag with an opening function according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing the foldable paper bag with an opening function according to the embodiment of the present invention shown in FIG. 1 cut along line 2-2.

FIG. 3 is a plan view showing a tubular foldable paper bag main body which is a component of the paper bag with an opening function shown in FIG. 1;

FIG. 4 is a cross-sectional view schematically showing an enlarged bottom closed portion of the paper bag with an opening function shown in FIG. 2;

FIG. 5 is a perspective view of an inner side of a paper piece constituting a backing sheet with an opening tape for surrounding and fixing a bent end formed by bending one end of a folded paper bag main body.

FIG. 6 is a perspective view showing a state in which the other side of the sheet constituting the backing sheet with the opening tape shown in FIG. 5 is bent to form a backing sheet.

FIG. 7 is a plan view particularly showing a paper bag main body and a mouth thereof constituting the paper bag with an opening function shown in FIG. 1;

8 is a perspective view partially showing a state in which the bottom closing portion of the paper bag with the opening function shown in FIG. 1 has begun to be opened.

9 is a perspective view partially showing a state of the paper bag with the opening function shown in FIG. 1 in a stage of completing the opening of the bottom closing portion.

FIG. 10 is a partial perspective view showing a state in which a non-applied portion of the adhesive is provided on a band-shaped adhesive layer which adheres an opening tape-attached one side region of a backing paper to a paper bag main body wall surface.

FIG. 11 is a partial perspective view showing another example of a state in which the backing sheet is torn by the opening tape.

FIG. 12 is a perspective view partially showing a state of an unsealing end stage of the unsealing tape when an uncoated portion of the adhesive as shown in FIG.

FIG. 13 is a partial perspective view showing a state in which a cut-off side of the backing paper is attached to the wall surface of the paper bag main body so as to cut longitudinally through a band-shaped adhesive layer which is bonded to the wall surface of the paper bag main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Paper bag with opening function 11 Paper bag main body 11a Edge 11b Lowermost edge at the other end of stair cut 12 Flap 13 Bending end 14 Opening tape 14a Knob 15 Backing paper 15a Folding line 15b One half area 15c Fold Bending piece 15d Side edge 16 Adhesive 17 Bottom closing part 18 Cut part for forming notch part 19 Cut part for cutting 20 Expected bending line 21 Flap 22 Double-sided adhesive sheet 23 Tearing part 24 Adhesive non-applied part 25 Cut

Claims (3)

[Claims] 1. A backing sheet is disposed so as to straddle a closed end of a paper bag body formed by bending one end of a tubular paper bag body, and each end of the backing paper is placed in the paper bag. A paper bag with an opening function, which is adhered to both wall surfaces of the main body to form an openable closed end which is opened for taking out the contents in the future, wherein the backing paper extends an opening tape over the entire width. A paper piece having a width dimension longer than the wall width of the paper bag main body attached to the back surface is formed, and one side of this paper piece is bent to the back side to have substantially the same width as the wall surface of the paper bag main body. On the other side of the backing paper, a notch for forming a knob portion cut along both sides of the end portion of the opening tape is formed, and the opening tape is formed on a folded piece bent to the back side. A single notch is formed along the edge of the Further, the bent end portion is implicate as unsealed function paper bag, characterized in that it is constituted by bending at least twice of the paper bag body surrounded fixed by the abutting sheet. 2. An adhesive for bonding each end side of the backing sheet to both wall surfaces of the paper bag main body, and at least the bent piece of the backing sheet is provided in a surface area where the opening tape is provided. 2. The paper bag with an opening function according to claim 1, wherein an adhesive non-applied portion is provided at an appropriate distance from substantially the edge of the paper bag body toward the center of the paper bag body. 3. The folded piece of the backing sheet, at least exceeding an adhesive application width, on an outer layer surface of the paper bag body to which an end of a surface area of the backing sheet provided with the opening tape is adhered. 3. A paper bag with an opening function according to claim 1, wherein a notch substantially parallel to an edge of the paper bag is provided.