JP2000296893A - Packaging bag for sandwich and manufacture of packaging bag for sandwich - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag for sandwich and a method of manufacturing the packaging bag for sandwich in which an anti-stain sheet is prevented from being brought into close contact with either a front surface film or a rear surface film constituting a bag body and then the bag can follow movement of the ingredients in the sandwich. SOLUTION: There is provided a packaging bag for sandwich comprised of a bag body 1 in which both side edges 5, 5 of a front surface film 12 and a rear surface film 13 having one end formed to be more narrow than that of the other end are thermally melted and adhered to each other, one end of the front surface film 12 and one end of the rear surface film 13 having seal segments 3, the other end is formed with an opening 4, and an anti-stain sheet 6 arranged in the bag body 1, wherein an abutting prevention clearance is formed between the front surface of the anti-stain sheet 6 and the rear surface of any of the front surface film 12 and the rear surface film 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandwich packaging bag for packing a sandwich and a method for producing the sandwich packaging bag.

[0002]

2. Description of the Related Art Conventionally, a packaging bag body for packing a sandwich is composed of two formed synthetic resin films such as polypropylene, one end formed on a tapered front film and one end formed on a back film, and both sides. The part is heat sealed and the other end is open to insert the sandwich.

[0003] Inside the packaging bag body thus formed, a rectangular dirt prevention sheet is provided to prevent the sandwiching components from sticking to the film forming the packaging bag and becoming dirty. Thus, a packaging bag is formed.

The other end of the dirt preventing sheet is adhered to the back film with an adhesive or the like, and the surface of the dirt preventing sheet on the back film side is stuck to the back film by static electricity. I have.

[0005]

However, when the dirt preventing sheet is adhered to the back film as described above, as described above, the back surface of the back film, that is, the inner surface of the bag body is prevented from being stained. To the surface of the application sheet, that is, the surface on the back film side. In other words, the back film and the dirt prevention sheet are in close contact and integrated. Therefore, even when the sandwich is thrown into the packaging bag body, once the dirt prevention sheet once abuts against the sandwich component, only the dirt prevention sheet does not move according to the movement of the sandwich component,
The antifouling sheet will move with the backing film. As a result, there is a problem that the dirt prevention sheet does not follow the sandwich component.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and prevents a sheet for preventing contamination from adhering to a front film or a back film constituting a bag main body, and is therefore effective in moving a sandwich member. It is an object of the present invention to provide a sandwich packaging bag and a method of manufacturing the sandwich packaging bag that can be followed.

[0007]

A sandwich packaging bag according to the present invention, which has been made to solve the above-mentioned problems, comprises a front film 12 and a back film 13 each having one end formed narrower than the other end. A bag body 1 having both side edges 5, 5 heat-sealed and having a seal portion 3 at one end of the front film and the back film and an opening 4 at the other end; And a dirt-preventing sheet 6 provided on the surface of the sandwich packaging bag, wherein the surface of the dirt-preventing sheet 6 and the back surface of any of the front film 12 and the back film 13 are prevented from abutting. Is provided with an air gap. As described above, since the gap for preventing contact is provided between the front surface of the dirt prevention sheet 6 and the back surface of any of the front film 12 and the back film 13, the sandwich is placed in the bag body 1. When storing, use a sheet to prevent contamination
6 can be prevented from adhering to the front and back films.

Further, in the sandwich packaging bag according to the present invention, the dirt preventing sheet 6 is formed in a rectangular shape and has a bent curve at at least one end in the longitudinal direction to form a gap for preventing contact. If it is, a sheet for preventing dirt
6, a gap can be formed, and thus a gap can be easily formed.

Further, in the sandwich packaging bag according to the present invention, a cutting line 10 capable of separating an area including an abutting portion of the dirt preventing sheet 6 which abuts on a sandwich component housed in the bag body 1 is provided. When the dirt prevention sheet 6 is placed along the sandwich, the dirt prevention sheet can be cut along a cutting line. Therefore, the dirt prevention sheet 6 can move freely, for example, in the width direction thereof when cut along the cutting line.
Can be surely fitted to the tool.

The front film 12 and the back film 13
The front film 12 and the back film 13
Are respectively extended to form two protruding pieces, and one end side of the dirt prevention sheet 6 is protruded from the protruding pieces,
If the dirt preventing sheet 6 is provided with a cutting line 15 on the side opposite to the protruding piece via the seal portion 3, the dirt preventing sheet 6 can be cut along the cutting line. Therefore, the dirt prevention sheet 6 can move freely, for example, in the width direction thereof when cut along the cutting line, so that the dirt prevention sheet 6 can be reliably aligned with the tool.

Further, both ends of the dirt prevention sheet 6 are attached to either the front film 12 or the back film 13, and the dirt prevention sheet is housed in the bag main body 1. If a cutting line that can separate the area including the abutting portion that abuts on the sandwich is provided, when inserting the sandwich, both ends of the antifouling sheet 6 are attached to the bag body 1. As a result, the bag body 1 to which the dirt prevention sheet 6 is adhered can be made taut, so that the entire bag body 1 can be stiff. Further, it is possible to prevent the dirt prevention sheet 6 from breaking.

A feature of the method for manufacturing a sandwich package according to the present invention is that both edges of a front film 12 and a back film 13 each having one end formed to be narrower than the other end are heat-sealed. A bag body 1 having a seal portion 3 at one end of the film 12 and the back film 13 and an opening 4 at the other end, and a dirt prevention sheet provided on the bag body 1
6.A method for manufacturing a sandwich packaging bag, comprising the steps of: bending at least one end of the antifouling sheet 6 and attaching the bent end to either the front film 12 or the back film 13. , The dirt prevention sheet 6
Is cut along a cutting line 10 provided in a region including an abutting portion that abuts on a sandwich component.

Another feature of the method for manufacturing the sandwich packaging bag according to the present invention is that both edges of the front film 12 and the back film 13 each having one end formed to be narrower than the other end are heat-sealed. A bag body 1 having a seal portion 3 at one end of the front film 12 and the back film 13 and an opening 4 at the other end, and a dirt prevention sheet 6 provided in the bag body 1. In the method for producing a sandwich packaging bag comprising:
The point is that after being attached to either of the back film 12 and the back film 13, the dirt preventing sheet 6 is cut along a cutting line 16 provided in a region including a contact portion that comes into contact with a sandwich member. Thus, both ends of the dirt prevention sheet 6 are covered with the front film 12.
Then, when the sheet is cut along the cutting line 16 after being attached to one of the back film 13, the dirt prevention sheet 6 is attached, for example, until a sandwich is inserted, and the opening 4 of the bag body 1 is inserted to insert the sandwich. When you open the dirt prevention sheet
By cutting 6, it is possible to reduce the possibility of occurrence of defects such as breakage of the dirt prevention sheet 6 when a sandwich is inserted.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a partially cutaway perspective view showing a sandwich packaging bag according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. .

In FIG. 1, reference numeral 1 denotes a bag body. The bag body 1 is composed of, for example, a front film 12 and a back film 13 on the surface of which a synthetic resin film such as polypropylene has been subjected to printing for decoration or the like as necessary. 13 is heat-sealed at one end thereof to form a seal portion 3, and the side edges 5, 5 are also heat-sealed to form a bag body.
1 is formed. In addition, front film 12 and back film
As shown in FIG. 1, the shape of the trapezoid 13 has a trapezoidal shape in which one end is formed narrower than the other end, and has a wider side (ie,
It is formed in a substantially trapezoidal shape in which triangles 20, 20 are cut off on both sides of the lower end in FIG. 1). The front film 12 and the back film 13 are further extended from the seal portion 3 on one end side to form a projecting piece 12a and a projecting piece 13a, respectively (see FIGS. 1 and 3). The other end of the bag body 1 is an open opening 4.

The bag body 1 formed by heat-sealing one end and both side edges 5, 5 of the front film 12 and the back film 13 prevents the sandwich member from directly adhering to the back film 13. A substantially rectangular dirt prevention sheet 6 made of a synthetic resin film such as polypropylene is provided.

Here, the stain preventing sheet 6 has a length in the longitudinal direction of, for example, 20 cm and a length in the width direction of, for example, 7 cm.
And the dirt prevention sheet 6
In the longitudinal direction, that is, in FIG. 1, about 2.5 cm inside from both ends in the vertical direction, that is, the center side (in other words,
A fold curve 8 is formed at a position of about 2.5 cm from one edge to the other edge). Then, at a predetermined position at the end from the edge to the folding curve 8, for example, at a position approximately half of the edge and the folding curve 8, and 5 mm ×
Heat-sealed to a size of about 10 mm and affixed to the back film 13 to form the affixed portions 7,7 (FIGS. 1 and 2).
reference). In FIG. 1, the heat-sealed sticking portions 7,
7 are provided near the edges on both sides of the edge and at a position approximately half of the fold curve 8. The sticking portion at the upper end in FIG. 1 is not shown, but is provided at the lower end. Although only the attached portions are shown, the attached portions are provided at both ends.

As described above, the dirt preventing sheet 6 has a folding curve.
As shown in FIG. 3, at least the surface of the back film 13, that is, between the inside of the bag body 1 and the surface of the back film 13 side of the soil prevention sheet 6 has at least the soil prevention A gap 9 corresponding to the thickness of the end of the sheet 6 is formed. By forming the gap 9 in this way, it is possible to prevent the stain prevention sheet 6 from contacting the back film 13.

As described above, the front film 12 and the back film 13
The sandwich packaging bag according to the present invention is constituted by the bag body 1 and the dirt prevention sheet 6 formed from the above. Dirt prevention sheet 6
Are arranged so as to be in contact with and accommodated.

In the above-described embodiment, the end portion is set to a length of about 2.5 cm from the end edge. For example, when the total length of the dirt preventing sheet in the longitudinal direction is 20 cm, the end portion may be, for example, When it is in the range of about 1.5 to 3.5 cm, a gap can be formed between the surface of the antifouling sheet and the surface of the back film on the inner side of the bag body. Can be prevented from sticking to each other.

In the above embodiment, the back film and the end of the dirt prevention sheet are adhered by a square heat seal. However, the back film may be heat-sealed in a linear shape, or another material such as an adhesive or tape may be used. You may stick by means. Furthermore, the position to be stuck is not limited to both sides of the end portion as in the above-described embodiment, and can be appropriately changed, for example, a portion near the center or the end edge of the end portion. It is not limited to two places on both sides, but can be changed as appropriate at one place or at three or more places at substantially the center of the end portion, and the area to be stuck is not limited to the above embodiment and is arbitrary.

Further, in the above embodiment, the front film and the back film are further extended from the seal portion 3 provided at one end side to form the projecting pieces 12a and 13a. The protruding piece is not always necessary. However, when the protruding piece is provided, there is an advantage that when eating the sandwich housed in the bag body, the protruding piece can be easily gripped and pulled toward the other end of the bag body.

FIG. 4 shows another embodiment of the sheet for preventing contamination of the packaging bag according to the present invention. FIG. 4 is a partially cutaway perspective view showing another embodiment of the packaging bag. In FIG. 4, similarly to the above-described embodiment, for example, a front film 12 having a surface printed with a decoration or the like on a surface of a synthetic resin film such as polypropylene is provided as necessary.
The front film 12 and the back film 13 are heat-sealed at one end thereof to form a seal portion 3, and the side edges 5, 5 are also heat-sealed to form the bag body 1. ing. The other end of the bag body 1 is an open opening 4. Further, inside the bag body 1, there is provided a dirt prevention sheet 6 formed of a synthetic resin film such as polypropylene, for example, as in the above embodiment, about 2.5 cm in length from one edge to the other edge in the longitudinal direction. Bent curves 8, 8 are provided at approximately the positions. Further, a front film and a back film are further extended from a seal portion 3 provided at one end side of the bag body 1 to form projecting pieces 12a and 13a.

Further, in this embodiment, a perforation 10 for facilitating cutting is provided on one end of the dirt prevention sheet 6 at about 2 mm from the fold curve 8 to the other end.
Also in this embodiment, similarly to FIG.
At least a part of the end portion from the one edge of FIG. 6 to the closest folding line 8 is stuck to the back film 13 by heat sealing or the like, and the dirt preventing sheet 6 is bent at the folding line 8. Have been. In addition, both ends of the dirt prevention sheet 6 are bent along a folding curve 8.

By being bent in this manner, a gap is provided between the surface of the back film 13 on the side of the bag body 1 and the dirt prevention sheet 6 as in the above-described embodiment. The sheet 6 can be prevented from sticking.

Further, for example, when air is blown from the opening 4 of the bag body 1 with a blower or the like in order to insert a sandwich into the bag body 1, the perforations 10 provided on the dirt prevention sheet 6 are cut by the force of the air. Is done. When the dirt prevention sheet 6 is cut from the perforations 10, the dirt prevention sheet 6 can move freely, for example, in the width direction of the dirt prevention sheet 6, so that the dirt prevention sheet 6 can easily follow the movement of the sandwich components. In addition, the sheet for preventing dirt can easily follow the ingredients of the sandwich. The timing of cutting the perforations 10 is not limited to the above, and can be appropriately changed, for example, before heat sealing the seal portion 3.

Further, a perforation 10 for facilitating cutting is provided.
In the above embodiment, the perforation is provided at about 2 mm from the fold curve 8 at the other end, but the perforation is provided at the end side if the fold curve 8 is, for example, about 0 to 10 mm. Or the other end, and can be changed as appropriate. In short, any position may be used as long as it can separate the region 6a including the contact portion that comes into contact with the sandwich tool housed in the bag body 1 from the other region 6b. However, 0-1
It is preferable to be near the folding curve 8 in the range of about 0 mm because the cut end has a good appearance.

In the embodiment shown in FIG. 4, the dirt preventing sheet is provided with perforations as cutting lines. However, the cutting lines are not limited to perforations. Any material can be appropriately changed as long as it is easy to cut the sheet for prevention. Further, FIG.
In the above, the perforations of the dirt prevention sheet are provided only at the narrow end, that is, only at the upper end in FIG.
That is, it may be provided at the lower end of FIG. However, when provided at the lower end, the position is such that the region sandwiched between the perforations provided at the upper end and the lower end includes at least the contact portion that abuts on the sandwich tool. To be provided. Also, the perforations provided at the lower end are more difficult to cut than the perforations at the upper end so that they are not easily cut when sending air with a blower or the like from the opening 4 to insert a sandwich. It is preferable to form them so that

As described above, when both ends of the dirt prevention sheet 6 are adhered to the back film 13 and the dirt prevention sheet 6 is cut at the perforations 10 when the sandwich is put in, the sandwich can be automatically wrapped. It is possible to improve the speed of packaging the sandwich in the packaging bag. In addition, if the dirt prevention sheet 6 is cut at the perforation when the sandwich is inserted, there is no problem such as the dirt prevention sheet 6 being bent before the sandwich is inserted, and the dirt prevention sheet 6 can be surely adhered to the sandwich components. Can be made.

As another embodiment of the packaging bag according to the present invention, as shown in FIG.
The packaging bag may be configured to protrude toward the partially protruding pieces 12a and 13a. FIG. 5 is a partially cutaway plan view showing another embodiment of the packaging bag according to the present invention, and FIG.
FIG. 3 is a sectional view taken along line A. In this embodiment, as in FIG. 1, the front film 12 and the back film 13 formed in a substantially trapezoidal shape.
Is heat-sealed at one end thereof to form a seal portion 3, and the side edges 5, 5 are also heat-sealed to form the bag body 1. Further, a front film and a back film are further extended from a seal portion 3 provided on one end side of the bag body 1 to form projecting pieces 12a,
13a is formed. Further, inside the bag body 1, there is provided a dirt prevention sheet 6 formed of a synthetic resin film such as polypropylene. Dirt prevention sheet 6
5 and 6, the upper side, for example, about 5 to 15 mm, is formed on the protruding piece 12.
A sheet piece 6c is formed so as to protrude toward the a, 13a side. At the other end of the sheet 6 for dirt prevention, sticking portions 7, 7 are provided at two places in the width direction. Then, it is heat-sealed and adhered to the back film 13 in a linear manner. In addition, dirt prevention sheet 6
At about 5 to 2 on the wide side from the seal portion 3 of the bag body 1.
At a position of about 0 mm, a perforation 15 is provided as a cutting line for facilitating cutting of the dirt prevention sheet 6.

In the present embodiment, the folding line of the stain preventing sheet 6 is not provided as in the above embodiments, but as shown in FIG. The back film 13
A gap 9 is generated between the sheet and the dirt prevention sheet 6. Therefore, even if the dirt preventing sheet is not bent, a gap is formed between the back film and the dirt preventing sheet as in the above-described embodiments, and it is possible to prevent the back film and the dirt preventing sheet from adhering to each other.

Another embodiment of a packaging bag according to the present invention will be described with reference to FIG. FIG. 7 is a partially cutaway plan view showing still another embodiment of the packaging bag according to the present invention.
In FIG. 7, as in FIG. 1, the front film 12 and the back film 13 formed in a substantially trapezoidal shape are heat-sealed at one end thereof to form a seal portion 3, and the side edges 5, 5 are also heat-sealed. A bag body 1 is formed. Further, a front film and a back film are further extended from a seal portion 3 provided on one end side of the bag body 1 to form projecting pieces 12a and 13a. In addition, an open opening 4 is provided on the other end side of the bag body 1. Further, inside the bag body 1, a rectangular dirt prevention sheet 6 formed of a synthetic resin film such as polypropylene is provided. Perforations 16 and 16 are provided as cutting lines on both sides of the dirt prevention sheet 6 in the longitudinal direction, for example, about 2 to 10 mm, and the sandwich between the perforations 16 and 16 is stored in the bag body 1. Dirt prevention sheet so as to be in the area 6a including the contact portion that contacts the component
A length of 6 is set. In the stain prevention sheet 6, a portion other than the region 6a, that is, a portion from the edge to the perforation 16 is a region 6b, and in each of the regions 6b, an adhesive portion 7 heat-sealed with the back film 13 is provided. , 7 are provided. The bag body 1 and the stain preventing sheet 6 constitute a packaging bag according to the present invention.

In the state where the dirt preventing sheet 6 is stuck to the back film 13 as described above, air is introduced from the opening 4 and
When the sandwich is inserted into the bag body 1, for example, when the upper perforation 16 is cut, a gap is generated between the area 6a cut by the perforation 16 and the lower area 6b and the back film 13. . Therefore, it is possible to easily make the dirt prevention sheet 6 along the sandwich. At this time, both the upper and lower perforations 16, 16 may be cut. Further, the timing of cutting the perforations is not limited to the above, and can be changed as appropriate. In short, the bag itself
1 When putting the sandwich in the
6 to prevent the film from sticking to the backing film 13.
It is sufficient that a gap is provided between 6 and the back film 13.

As described above, when both ends of the dirt prevention sheet 6 are stuck to the back film 13 and the cutting lines 16 are provided on the dirt prevention sheet 6, when inserting the sandwich, , The both ends of the dirt prevention sheet 6 are the bag body
Since the dirt prevention sheet 6 is affixed to the bag body 1, the bag body 1 to which the dirt prevention sheet 6 is affixed can be made taut, and thus the entire bag body 1 can be stiff. Further, it is possible to prevent the dirt prevention sheet 6 from breaking.

Further, the dirt prevention sheet 6 is adhered until the sandwich is inserted, and when the opening 4 of the bag body 1 is opened to insert the sandwich, the dirt prevention sheet 6 is cut. When the sandwich is inserted, it is possible to prevent the occurrence of defects such as breakage of the dirt prevention sheet 6.

In the embodiment shown in FIG. 5 and FIG. 7, the dirt preventing sheet and the backing film are adhered at the linear adhesive portion, but the shape of the adhesive portion is shown in FIG. It may be heat-sealed in a rectangular shape or the like as in the embodiment, or may be stuck using other means such as an adhesive or an adhesive.

In addition to the above embodiments, a cut tape may be provided on the front film as a means for opening the front film for easily opening the front film. This surface film opening means is not limited to the cut tape, for example, to provide a cut portion by applying a half-cut to the front film, or to provide a directional film on the front film, a film having a directional For example, it can be changed as appropriate.

The sheet for preventing stains is not limited to the above-mentioned polypropylene, but may be another synthetic resin film, and such a synthetic resin film is embossed. You may.

In each of the above embodiments, the front film and the back film each have a trapezoidal shape in which one end is formed to be narrower, and a substantially trapezoidal shape in which both sides of the wide end are cut out in a triangular shape. However, the end on the wide side may have a trapezoidal shape that is not notched in a triangular shape, and the one end side formed to be narrow may have a non-linear shape such as a waveform. In short, it can be appropriately changed as long as one end is formed to be narrow and the sandwich can be accommodated.

In the present invention, any structure may be used as long as a gap is provided between the back film and the stain preventing sheet. That is, it is also possible to form a gap between the dirt preventing sheet and the back film by forming the dirt preventing sheet in a bellows form or by sticking the dirt preventing sheet so as to be curved with respect to the back film. , Within the intended scope of the present invention.

In each of the above embodiments, the stain preventing sheet is attached to the back film for convenience, but it is needless to say that the stain preventing sheet may be attached to the front film.

[0042]

According to the sandwich packaging bag of the present invention, even when the sandwich is accommodated in the packaging bag, it is possible to prevent the dirt preventing sheet from adhering to the front film and the back film, Therefore, the sandwich can be easily accommodated in the package.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view showing one embodiment of a sandwich packaging bag according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a partially cutaway perspective view showing another embodiment of the packaging bag according to the present invention.

FIG. 5 is a partially broken plan view showing another embodiment of the packaging bag according to the present invention.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a partially broken plan view showing still another embodiment of the packaging bag according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag main body 2 Cutting part 3 Seal part 4 Other end part 5 Side edge 6 Dirt prevention sheet 12 Front film 13 Back film

Continued on front page F term (reference) 3E067 AA11 AB01 BA12A BA15A BA31A BB16A CA24 EA06 EB03 EC33 EE02 3E075 AA07 BA41 CA01 DD02 DD12 DD45 GA04 3E086 AB01 AC40 AD01 BA15 BB51 BB61 BB62 CA01 3E0912 AA02 BA28

Claims (7)

[Claims] 1. Both edges (5, 5) of a front film (12) and a back film (13), each having one end formed narrower than the other end, are heat-welded to the front film (12) and the back film (12). The back film (13) has a seal portion (3) at one end thereof, and further has an opening at the other end.
(4) In a sandwich packaging bag comprising a bag main body (1) formed having: and a dirt prevention sheet (6) provided in the bag main body (1), Sheet
A packaging bag for sandwiches, wherein a gap for preventing contact is provided between the front surface of (6) and one of the back surfaces of the front film (12) and the back film (13). 2. The dirt preventing sheet (6) is formed in a rectangular shape and has a fold curve (8) at at least one end in the longitudinal direction.
The sandwich packaging bag according to claim 1, wherein a void for preventing contact is formed by having a gap. 3. A bag body is provided on the stain preventing sheet (6).
3. The sandwich packaging bag according to claim 2, wherein a cutting line (10) capable of separating an area including an abutting portion which abuts on a sandwich component housed therein is provided. 4. The front film (12) and the back film (13)
A front film (12) and a back film (13) are respectively extended from a seal portion (3) on one end side of the seal member (3) to form two projecting pieces, and one end side of the dirt prevention sheet (6) is The dirt prevention sheet (6) is provided with a sealing portion
The sandwich packaging bag according to claim 1, wherein a cutting line (15) is provided on a side opposite to the protruding piece via (3). 5. Both ends of the dirt prevention sheet (6)
The abutting portion that is affixed to either the front film (12) or the back film (13), and that is in contact with the sandwich tool housed in the bag body (1), is attached to the dirt prevention sheet. 2. The sandwich packaging bag according to claim 1, wherein a cutting line capable of separating an area including the cutting bag is provided. 6. Both sides of a front film (12) and a back film (13) having one end formed to be narrower than the other end are heat-welded, and the front film (12) and the back film (13) are formed. A bag body (1) having a seal portion (3) at one end thereof and an opening (4) at the other end thereof; and a dirt prevention sheet (1) provided on the bag body (1). 6) A method for manufacturing a sandwich packaging bag comprising the steps of: bending at least one end of a dirt preventing sheet (6), and bonding the bent end to a front film (12) and a back film (13). After adhering to any one of the above, the dirt preventing sheet (6) is cut along a cutting line (10) provided in a region including an abutting portion for abutting on a sandwich component, and sandwich packaging. Bag manufacturing method. 7. Both sides of a front film (12) and a back film (13), one end of which is formed narrower than the other end, are heat-sealed, and the front film (12) and the back film (13) A bag body (1) formed with a seal portion (3) at one end and an opening (4) at the other end, and a dirt prevention sheet provided on the bag body (1). (6) In the method for producing a sandwich packaging bag comprising the above, after sticking both ends of the antifouling sheet (6) to either the front film (12) and the back film (13), Cutting the dirt preventing sheet (6) along a cutting line (16) provided in an area including an abutting portion which abuts on a sandwich tool housed in the bag body (1); Manufacturing method of packaging bag.