JP2003291986A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag improved to always easily take out a packaged object by surely preventing the object from getting inconveniently difficult to be taken out due to only a portion of a bag body tearing. <P>SOLUTION: The packaging bag comprises the bag body 3 for receiving and wrapping a rice ball R, a cut 50 provided at an edge of the bag body 3, and an anti-shifting tape 40 formed on the bag body 3 from a vicinity of the cut 50 in the tearing direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag which is suitable for packaging an object to be packaged mainly consisting of food such as rice balls and sandwiches.

[0002]

2. Description of the Related Art Conventionally, a packaging bag 100 for packaging an object to be packaged (rice ball R) as shown in FIG. 6 has been known. In this packaging bag 100, a single sheet body, in which a film made of a thermoplastic synthetic resin such as polyethylene is welded to the back surface of a base material, is folded, and a welding portion 101 formed by a welding treatment is provided at an edge portion of the folded portions. It is formed by being provided.

The packaging bag 100 is provided with an opening 102 for inserting the rice ball R in its lower edge portion (in FIG. 6, the opening 102 is shown in a closed state), and the rice ball R is opened from this opening 102. After being inserted into the packaging bag 100, the lower portion of the packaging bag 100 is bent and attached with an adhesive tape or the like, so that the rice ball R is packaged in the packaging bag 100.

The welded portion 101 formed on the upper edge of the packaging bag 100 is provided with a U-shaped cut 103 that serves as a starting point for opening. And this cut 1
03, sandwich the welded parts 101 on both sides with your fingers,
The packaging bag 10 is pulled by pulling in opposite directions.
0 breaks the bag so that the rice ball R inside can be taken out from the packaging bag 100.

[0005]

By the way, in the conventional packaging bag 100 as described above, the packaging bag 10 is opened at the time of opening.
The left and right ends of the welded portion 101 at the upper end of 0 are pinched with fingers and pulled in opposite directions.
Then, as shown in FIG. 6, the breaking line becomes arcuate and reaches the side portion of the packaging bag 100 at a substantially intermediate position in the vertical direction, whereby the fragment 104 is torn off from the main body of the packaging bag 100. However, only the upper corner of the packaging bag 100 is open, and the rice ball R cannot be taken out smoothly.

Therefore, in the conventional packaging bag 100, once the broken pieces 104 have been cut off to form an opening, an operation for further expanding the opening must be performed, and it is very troublesome to take out the rice ball R. There was an inconvenience that

The present invention has been made in view of such a situation, and reliably prevents the inconvenience that it is difficult to take out the packaged item due to the tearing of only a part of the bag body. An object of the present invention is to provide an improved packaging bag in which the entire surface of the product can be smoothly cut and opened so that the object to be packaged can always be easily taken out.

[0008]

The invention according to claim 1 is
A lower end direction open type bag main body having a seal portion at an upper end edge, wherein the upper end edge is provided with a cutting cut for cutting the bag main body, and the cut end is used as a starting point in the bag main body. It is characterized in that a tape for preventing deviation in the cutting direction is provided on at least one side of the cutting direction.

According to the present invention, the outer side portions of the bag body are picked up by fingers and pulled in opposite directions through the cutting edges provided in the seal portion of the bag body, so that the bag body starts from the cut edge as a starting point. Cut off. Then, since the bag body is provided with a deviation prevention tape extending from the vicinity of the cut direction toward the cutting direction, the bag body does not tear across the deviation prevention tape due to the guidance thereof, Therefore, the inconvenience that only a part of the bag body is broken as in the conventional case is surely prevented, and the break opening is always formed along the deviation prevention tape.

The size of the breaking opening along the deviation prevention tape is set in advance to such a size that the article to be packaged can be easily taken out, so that the bag body torn from the bag body through the cut end is covered. The package can be easily taken out, and the conventional inconvenience that the packaged item cannot be easily taken out from the breaking opening by only breaking a part is solved.

The deviation prevention tape may be provided on both sides of the cutting edge (claim 2). By doing so, the bag body is cut between the pair of displacement prevention tapes, and a clean break opening is obtained.

In each of the above inventions, a composite sheet including a paper-like sheet and a synthetic resin film laminated on the paper-like sheet may be used as the bag body (claim 3). If such a composite sheet is used, the appearance of the bag body will be rich in texture due to the paper-like sheet, and the product will have a high-class appearance.

In each of the above inventions, the deviation prevention tape may be provided on either one of the front and back both sides or the front and back in the bag body (claim 4). By doing so, it becomes possible to provide the shift prevention tape in a state corresponding to various bag main bodies, and the versatility of tape application is improved.

[0014]

1 is a development view of a development sheet for a packaging bag according to a first embodiment of the present invention as seen from the back side, and FIG. 2 is a cross-sectional view taken along the line AA. . Also, FIG.
FIG. 4 is a perspective view showing a deformed cylinder obtained by folding the expansion sheet shown in FIG. 1, and FIG. 4 is a perspective view showing a packaging bag formed by welding the upper portion of the deformed cylinder shown in FIG. It is a figure.

The packaging bag 1 (FIG. 4) according to the present invention is
The raw material that is the raw material is wound up to form a raw material roll, which is sequentially drawn out from a raw material roll, which is subjected to a predetermined welding treatment or cutting treatment. A method (first method) in which each of the above processes is subjected to the above-mentioned treatments at once to continuously manufacture the packaging bag 1 or a process of first cutting the raw fabric drawn from the raw fabric roll by welding. Then, a method of obtaining a packaging bag 1 (second method) by first making a large number of rectangular bags and then cutting the laminated rectangular bags (second method), and further, cutting the raw fabric to first make the expansion sheet 10 After that, there is a method (third method) of performing a bending process and a welding process on the unfolded sheet 10 to obtain the packaging bag 1.

The first method is superior in terms of productivity, but the equipment becomes complicated and the equipment cost increases, so the packaging bag is produced by the second method in consideration of both the productivity and the equipment cost. It is common to produce 1. However, here, the correspondence relationship between the unfolding sheet 10 (FIG. 1) in the unfolded packaging bag 1 and the unfolding packaging bag 1 (FIG. 4) in which the unfolding sheet 10 is folded can be easily recognized. The method will be described first, and then the first and second methods will be described.

First, in the third method, the spread sheet 10 formed by cutting the original fabric will be described with reference to FIGS. 1 and 2. In the present embodiment, the unfolding sheet 10 has a two-layer structure in which the back sheet 30 is laminated on the back surface side (the upper side in FIG. 2) of the front sheet 20. On the back surface side of the unfolding sheet 10, a deviation prevention tape 40 is provided at a position slightly leftward in FIG. 1 from the center in the width direction and laminated over the entire length in the vertical direction as shown in FIG. .

In this embodiment, Japanese paper (paper-like sheet) is used as the front sheet 20, while the back sheet 30 is used.
As for polyethylene (PE) and polypropylene (P
A film made of a thermoplastic synthetic resin such as P) is used. Then, the original fabric of the back sheet 30 is laminated on the original fabric of the front sheet 20, and a predetermined welding process is performed in a state where the deviation prevention tape 40 is laminated on the original fabric,
The original fabric for the unfolding sheet 10 in which the three members are joined together is manufactured.

As the deviation preventing tape 40, a tape made of a thermoplastic synthetic resin which is processed so as to have a high tensile strength in the longitudinal direction is adopted. In this embodiment, polypropylene (OP) that has been uniaxially stretched is used, so that vertical tearing can be easily performed, but it does not easily break even when a force in the width direction is applied. ing.

Then, while the original fabric manufactured in this manner is pulled out, a predetermined cutting process is applied to the original fabric using a press machine or the like, so that a development sheet 10 as shown in FIG. 1 is obtained. I am trying to get them one after another. The original sheet of the unfolded sheet 10 is formed by welding the back sheet 30 to the front sheet 20, so that the unfolded sheet 10 obtained by cutting the unfolded sheet easily breaks in the longitudinal direction. Has become.

The unfolding sheet 10 has a vertical dimension larger (approximately twice) than the height dimension of a rice ball R (FIG. 4) having a substantially equilateral triangle shape, and has a width dimension (horizontal direction in FIG. 1). Is set to be slightly larger than the maximum outer peripheral dimension of the rice ball R, so that the widthwise edges of the rice ball R overlap with each other when wound on the rice ball R.

The spread sheet 10 has a front portion 11 formed in the center portion in the width direction, and a width direction extending from the respective edge portions in the width direction of the front portion 11 to the left and right. A pair of bellows parts 12 and a pair of width direction back parts 13 extending outward from the widthwise edges of each bellows part 12 are provided.

The width of the front portion 11 is set to be substantially equal to the width of the rice ball R having a triangular shape, and each bellows portion 12 has a width substantially equal to the thickness of the rice ball R. It is dimensioned. In addition, each back section 13
Has a width dimension slightly longer than half the width dimension of the front portion 11.

Between the front portion 11 and the bellows portion 12, the valley fold line 1 seen from the back surface side, which is indicated by a chain double-dashed line in FIG.
1a is set, and the bellows portion 12 and the back portion 1 are
A similar valley fold line 13a is set between 3 and 3.
In addition, a mountain fold line 12a extending in the vertical direction indicated by the alternate long and short dash line in FIG. 1 is set at the center position in the width direction of the bellows portion 12.

The front portion 11 has an upper edge portion 11b.
Has a pair of width-direction inclined edge portions 11c inclined downward from the appropriate position toward the valley fold line 11a, and the back portion 13 has a valley fold line 13 from the appropriate position of the upper edge portion 13b.
It has a slanted edge portion 13c that is slanted downward toward a. Further, each bellows portion 12 is at the uppermost position of the mountain fold line 12a (a position slightly lower than the upper edge portion 11b of the front portion 11).
It has a pair of inclined edge portions 12b inclined downward toward the valley fold lines 11a and 13a.

The offset prevention tape 40 has a front portion 1
1 is laminated and fused on the back sheet 30 side (see FIG. 2) so as to extend downward from the left position in FIG. The upper edge portion 11 near the shift prevention tape 40 and located on the right side in FIG.
A cut portion 50 formed by cutting into a substantially semicircular shape is provided in b, and the upper edge portion 1 of the left back portion 13 is formed.
3b is also provided with a cut edge 50 corresponding to the cut edge 50 of the front portion 11.

In the packaging bag 1 according to the present embodiment, the unfolded sheet 10 shown in FIG. 1 is valley-folded and mountain-folded along the valley fold lines 11a and 13a and the mountain fold line 12a, and then each back portion is formed. By laminating the overlapping side edges 13d of the 13 (shown by dotted lines in FIG. 1) by matching, and by performing a predetermined fusion treatment in this state, at the previous stage of the packaging bag 1 as shown in FIG. A deformed tubular body 2 is formed.

In the deformed cylindrical body 2, the upper edge portions 11b and 13b and the inclined edge portions 11c and 13c (indicated by dotted lines in FIG. 3) of the front portion 11 and the back portion 13 as well as the front portion 11 are formed. The slanted edge portion 12b (indicated by stippling in FIG. 3) sandwiched between the back and back portions 13 is subjected to welding treatment to form a seal portion in which the stippled portions are welded to each other. A packaging bag 1 as shown in is obtained. In addition, the packaging bag 1 immediately after being manufactured is the front part 1
1 and the back 13 are in contact with each other to be flat, but FIG. 4 shows a state in which the lower opening 14 is widened to load the rice ball R.

The packaging bag 1 thus obtained has a bag body 3 for containing the rice ball R and an upper edge portion 11 of the bag body 3.
In this state, the cut 50 is formed in b and 13b, and the deviation prevention tape 40 is welded to the back surface side of the bag body 3 in the vicinity of the cut 50 so as to extend in the vertical direction.

In the packaging bag 1, the upper opening is closed, and the lower opening 14 for loading the rice ball R is formed in the lower part. A cut 50 is formed in the upper edges 11b and 13b of the packaging bag 1, and the right side of the cut 50 extends over the entire length in the vertical direction on the back side of the front portion 11. The shift prevention tape 40 laminated integrally is welded.

Next, a case where the packaging bag 1 is manufactured by the first method will be described. In the first method, first, for the original drawn from the original roll,
The slip prevention tape 40 is welded in the tape welding step, whereby the original fabric is in a state in which the slip prevention tape 40 is laminated over the longitudinal direction at an appropriate position in the width direction on the back surface side.

Next, the original sheet on which the deviation prevention tape 40 is laminated is subjected to the folding step to form the valley fold line 1 shown in FIG.
The portions corresponding to the 1a, the mountain fold line 12a, and the valley fold line 13a are automatically folded, and the side edge portions 13d and 13d corresponding to each other are aligned. As a result, the original sheet is formed into a flat and deformed tubular shape with the back sheet 30 inside, and is sent to the next welding / cutting step.

In the welding / cutting process, as shown in FIG.
The portion indicated by the stippling (specifically, the upper edge portions 11b, 13
b, inclined edges 11c, 12b, 13c and side edges 13
Simultaneously with the welding process of d), the cutting process is performed (the cut end 50 is formed at this time), and the packaging bag 1 as shown in FIG. 4 is sequentially manufactured. Although FIG. 4 shows the packaging bag 1 in an inflated state, the packaging bag 1 immediately after being manufactured by the first method is in a flat state.

According to the first method, the packaging bag 1 is automatically and continuously manufactured by continuously supplying the drawn out raw material to the folding step and the welding / cutting step. It can contribute to the reduction of manufacturing cost.

Next, a case where the packaging bag 1 is manufactured by the second method will be described. Also in the second method, first, the shift prevention tape 40 is welded to the original sheet pulled out from the original sheet roll in the tape welding step,
As a result, the original sheet is in a state in which the deviation prevention tape 40 is laminated over the longitudinal direction at appropriate positions on the back surface side in the width direction.

Then, the original sheet on which the deviation prevention tape 40 is laminated is subjected to the folding step to form the valley fold line 11a shown in FIG.
The portions corresponding to the mountain fold line 12a and the valley fold line 13a are automatically folded, respectively, and the side edge portions 13d, 13d corresponding to each other are aligned. As a result, the original fabric is formed into a flat and deformed tubular shape with the back sheet 30 inside and is fed to the next welding step.

In the welding process, the parts which are shown in FIG. 1 as dotted lines, that is, the upper edge portions 11b and 13b and the inclined edge portions 11c and 12b, are sequentially drawn with respect to the original sheet which is being folded into a deformed tubular shape and is being drawn out. , 13c and the side edge portion 13d are welded and sent to the next cutting step.

In the cutting step, the original material that has been subjected to the welding treatment that is being drawn out is sequentially subjected to a predetermined cutting pitch so as to traverse the original material, whereby the rectangular shape that becomes the original shape of the packaging bag 1 is obtained. Sequential rectangular bags are obtained. These square bags are stacked until a predetermined number is reached. When the number of rectangular bags reaches a predetermined number, the laminated rectangular bags are sent to the next cutting step.

Then, in the cutting step, the fed laminated rectangular bag is subjected to a cutting process using a predetermined cutter blade, and an extra portion (the slanted edges 11c and 12b in the developing sheet 10 in FIG. 1) is cut by the cutting process. , 13c) and the cuts 50 are formed to obtain a plurality of packaging bags 1 as shown in FIG. 4 at the same time.

The operation of the present invention will be described below with reference to FIG. FIG. 5 is a perspective view for explaining the operation of the present invention. (A) shows a state in which the rice ball R is packaged by the packaging bag 1, and (b) shows a state in which the packaging bag 1 is broken. Shown respectively. When loading the rice ball R into the bag body 3 of the packaging bag 1, first, the lower opening 14 is expanded, and as shown by the arrow in FIG.
Is inserted into the bag body 3. Subsequently, the lower portion of the bag body 3 is bent, and the bent portion is attached to the surface of the bag body 3 with an adhesive tape or the like, so that the rice ball R is packed in a packaging bag as shown in FIG. The product is packaged by 1.

When taking out the rice ball R packaged in this way from the packaging bag 1, first, as shown by the chain double-dashed line in FIG. 5 (a), both ends of the upper edge portions 11b and 13b of the bag body 3 are removed. First, grasp each with a finger and knead with the cut 50 as a boundary (specifically, with the cut 50 as a boundary, in a direction orthogonal to the upper edge portions 11b and 13b, and a shearing force acts on each other. Pulling in the opposite direction), so that the cut portion 50 of the upper edge portions 11b and 13b is slightly torn.

Then, the upper edge portions 11b and 13b held by the fingers of the left and right hands are separated left and right. As a result, as shown in FIG. 5B, the bag main body 3 is torn to the left and right with the cut 50 as the starting point and opened in the vertical direction, so that the internal rice ball R can be taken out from this opening.

Further, in the present invention, the deviation preventing tape 40 is provided on the back sheet 30 side of the front portion 11 in the vicinity of the cut end 50 and at a slightly outward position, over the entire length in the vertical direction. Since they are integrally welded, when the bag body 3 is torn downward from the cut edge 50 as a starting point, the deviation preventing tape 40 prevents the tearing direction from going to the side portion of the bag body 3. . Therefore, in the case of the conventional packaging bag 100 shown in FIG. 6, the tearing direction is toward the side portion of the packaging bag 100, and thus the packaging bag 100 is
It is possible to reliably prevent the inconvenience that the inside rice ball R cannot be taken out because only the upper corner portion is cut out as the broken piece 104 and a small breaking opening is formed.

As described above in detail, the packaging bag 1 of the present invention has a bag body 3 for storing and packaging the rice ball R, a cut 50 provided at the edge of the bag body 3, and the vicinity of the cut 50. And the deviation preventing tape 40 formed on the bag body 3 in the direction of the breakage from the bag body 3
The outer portion (upper edge 11b, 1
By grasping (both ends of 3b) with fingers respectively and pulling in opposite directions, the bag body 3 is guided to the cut 50 and is torn from that portion.
Due to the prevention of breakage by the deviation prevention tape 40, the bag body 3 does not tear across the deviation prevention tape 40, and a breaking opening is always formed along the deviation prevention tape 40.

Since the size of the breaking opening along the deviation preventing tape 40 is set to a size that allows the rice ball R to be easily taken out, the rice ball is torn from the bag body 3 torn in two through the cut 50. It becomes possible to take out R easily, and it is possible to solve the conventional inconvenience that the rice ball R cannot be easily taken out from the breaking opening because only a part is broken.

Further, since the packaging bag 1 is formed by folding the single developing sheet 10 so as to have the lower opening 14 into which the rice ball R is inserted at the lower end portion,
The structure of the packaging bag 1 becomes simple, suitable for mass production, and can contribute to reduction of manufacturing cost.

In this case, the cut edge 50 is vertically opposed to the lower opening 14 of the bag body 3, and the upper edge portions 11b and 13 are formed.
b, and the deviation prevention tape 40 is cut into a cut 50
Since the bag body 3 is formed from the vicinity toward the lower opening 14, the bag main body 3 is torn by the breaking operation through the cut opening 50 while being guided by the deviation prevention tape 40. Therefore, the rice ball R can be easily taken out from the breaking opening while preventing the rice ball R from falling out of the bag body 3.

Further, the slip prevention tape 40 is attached to the bag body 3
Since it is provided on the back surface side of the slip prevention tape 40, it cannot be seen from the front surface side of the bag body 3, and the deviation prevention tape 4
There is no unpleasantness due to the visual recognition of 0, and the packaging bag 1 can have a beautiful external appearance.

The present invention is not limited to the above-mentioned embodiment, but also includes the following contents.

(1) In the above embodiment, the rice ball R is used as the object to be packaged, but the packaging bag of the present invention is not limited to the rice ball R as the object to be packaged. It can also be suitably used for packaging snack foods such as sandwiches and hot dogs, and various other reasonably sized products other than foods.

(2) In the above embodiment, the deviation prevention tape 40 is provided on the back side of the front portion 11 of the bag body 3, but the installation position of the deviation prevention tape 40 is particularly There is no limitation, and it may be provided on the front surface side of the front portion 11, or may be provided on either the front or back of the back portion 13.
Further, the deviation prevention tape 40 may be provided on both the front portion 11 and the back portion 13.

(3) In the above-mentioned embodiment, only one tape 40 for preventing deviation is provided in the vicinity of the cut 50 of the front portion 11 so as to extend in the vertical direction, but instead of this, The slip prevention tapes 40 may be welded to the both sides of the cut edge 50, respectively. If the cut 50 is sandwiched between the two slip prevention tapes 40 in this manner, the bag body 3 is broken between the two slip prevention tapes 40, so that the edge of the breaking opening has an irregular curve. Therefore, it is possible to reliably prevent the inconvenience of becoming unsightly.

(4) In the above embodiment, Japanese paper is used as the paper-like sheet used for the front sheet 20, but the present invention is not limited to the paper-like sheet being Japanese paper. Instead, it may be synthetic paper such as so-called rayon paper on which a paste pattern is formed, or may be an ordinary synthetic resin sheet.

(5) In the above embodiment, the slip prevention tape 40 is welded or adhered to the front portion 11 of the bag body 3, but instead of this, the original sheet for the unfolding sheet 10 is prepared in advance. When manufacturing a raw sheet by setting the thickness in advance so that the thickness dimension of the deviation prevention tape in the original sheet is welded to be thicker than the thickness dimension of other portions, after that, Misalignment prevention tape 4
It is not necessary to weld 0 to the bag body 3, which contributes to the reduction of manufacturing cost. In this case, the linear thick portion of the original sheet can be regarded as the deviation prevention tape 40.

(6) In the above-mentioned embodiment, the cut edge 50 is provided at the upper edges 11b and 13b of the bag main body 3, and the bag main body 3 is torn vertically starting from the cut edge 50. The present invention is not limited to the one in which the bag body 3 is vertically torn, and the bag body 3 may be horizontally torn depending on the type of the object to be packaged. In this case, the cut 50 is formed on the side portion of the bag body 3, and the deviation prevention tape 40 is provided on the bag body 3 so as to extend in the lateral direction.

(7) In the above embodiment, the expansion sheet 10 has a two-layer structure composed of the front sheet 20 and the back sheet 30, but in the present invention, the expansion sheet 10 has a two-layer structure. However, it may have a single-layer structure or a three-layer structure or more.

(8) In the above embodiment, the semicircular cut 50 is formed in the upper edges 11b and 13b of the expansion sheet 10.
However, the present invention is not limited to the cut end 50 having a semicircular shape, and may have a V shape or a short linear cut.

(9) In the above-described embodiment, the side edge portions 13d of the expansion sheet 10 are welded to each other by witness, but in the present invention, the side edge portions 13d are welded to each other by witness. However, the side edge portions 13d may be welded to each other by so-called envelope matching as used in envelopes.

(10) In the above embodiment, a polyethylene (PE) or polypropylene (PP) film is used as the back sheet 30, but in the present invention, the back sheet 30 is made of PE or PP. The polyvinyl chloride (PV
Any thermoplastic synthetic resin material suitable for forming a film such as C), polystyrene (PS), polyamide (PA), polycarbonate (PC) or polyethylene terephthalate (PET) can be applied.

(11) In the above embodiments, the uniaxially stretched polypropylene (OP) is used as the deviation prevention tape 40. However, in the present invention, the deviation prevention tape 40 is uniaxially stretched. The polypropylene is not limited to polypropylene (OP) that has been subjected to a biaxial stretching treatment, and OP that has been subjected to a biaxial stretching treatment, polyvinyl chloride (PVC) that has been subjected to a uniaxial or biaxial stretching treatment, and polystyrene (PS). , Polyamide (PA), polycarbonate (PC) or polyethylene terephthalate (PE
) Or the like, or in the case of an inherently tough film such as polytetrahaloethylene (PТHE), a film that has not been particularly stretched may be used as the deviation prevention tape 40. it can. Further, the slip prevention tape 40 is not limited to the thermoplastic synthetic resin material as long as it is compatible with the back sheet 30 in the welding process, and may be a cellulose-based natural fiber (such as cotton or hemp) or a synthetic fiber. A material made of (acetate or the like) may be adopted. That is, it is compatible with the back sheet 30,
In addition, any material having a large tensile strength can be applied as the deviation prevention tape 40.

[0061]

As described above in detail, in the packaging bag of the present invention, the lower end direction open type bag body having the seal portion at the upper end has the cutting edge for cutting the bag body at the upper edge. Since a tape for preventing deviation in the cutting direction is provided on at least one side in the cutting direction starting from the cut edge inside the bag main body, the outside portions of the bag main body are respectively fingered through the cut edge of the bag main body. By pulling with, each pulling in the opposite direction, the bag body is broken from the cut side to the left and right, but the break prevention tape prevents the bag body from tearing across the deviation prevention tape, The inconvenience that only a part of the bag body is broken as in the conventional case is surely prevented, and the whole packaging bag is smoothly cut and opened, so that a clean break opening can be always formed.

Therefore, it becomes possible to easily take out the article to be packaged from the bag body torn in two through the cut, and it becomes difficult to take out the article to be packaged from the breaking opening because only a part is broken. It is possible to eliminate the conventional inconvenience.

[Brief description of drawings]

FIG. 1 is a development view of a development sheet for a packaging bag according to a first embodiment of the present invention as viewed from the back side.

FIG. 2 is a sectional view taken along line AA of the expansion sheet shown in FIG.

3 is a perspective view showing a deformed cylinder obtained by folding the expansion sheet shown in FIG. 1. FIG.

FIG. 4 is a perspective view showing a packaging bag formed by welding the upper portion of the deformed cylindrical body shown in FIG.

FIG. 5 is a perspective view for explaining the operation of the present invention,
(A) shows a rice ball wrapped in a packaging bag,
(B) shows the state in which the packaging bag is broken.

FIG. 6 is a perspective view illustrating a conventional packaging bag.

[Explanation of symbols]

1 Packaging bag 2 Deformed cylinder 3 Bag body 10 Deployment sheet 11 Front part 11a Valley fold line 11b upper edge 11c inclined edge 12 Bellows 12a Mountain fold line 12b inclined edge 13 back 13a Valley fold line 13b Upper edge 13c inclined edge 13d side edge 14 Lower opening 20 Front sheet 30 Back sheet 40 Misalignment prevention tape 50 cut

Claims (4)

[Claims] 1. A bag main body of a lower end direction open type having a seal portion at an upper end edge, wherein a cutting edge for cutting the bag main body is provided at the upper end edge, and the bag main body is provided with the cutting opening. A packaging bag, wherein a tape for preventing deviation in the cutting direction is provided on at least one side of the cutting direction starting from the cut end. 2. The shift prevention tape is provided on both sides of the cutting edge for cutting.
The stated packaging bag. 3. The bag body according to claim 1, wherein the bag body is formed of a composite sheet including a paper-like sheet and a synthetic resin film laminated on the paper-like sheet. Packaging bag. 4. The packaging bag according to claim 1, wherein the shift prevention tape is provided on either one of the front and back sides or the front and back sides in the bag body. .