Food packaging bag

Abstract

To provide a food packaging bag that is able to obtain the quality of being suitably stable and the quality of being self-standing in the form of a food package.SOLUTION: A food packaging bag 1 comprises a bag body 10 in which a pair of sheets 2, 3 having such a shape that one end in a first direction is wider than the other end in a first direction are superposed, three sides are sealed by a top joint portion 11 on a side of the one end and side joint portions 12, 12 on both sides, and an opening 13 is formed on a side of the other end. At least one of the pair of sheets 2, 3 is sectioned into a plurality of areas 22-24 in the first direction. A plastic sheet, a paper sheet or a cellophane sheet is selectively used for each of the areas 22-24, and parts of the pair of sheets 2, 3 are provided with a paper sheet or a cellophane sheet.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a food packaging bag for packaging food.

Background Art

[0002] There are foods such as sandwiches that are finished in a three-dimensional shape with a triangular side shape (mainly a right-angled triangle shape) or a shape similar thereto and having a predetermined thickness or width. As a food packaging bag for packaging this food, those shown in FIGS. 37 and 38(a) are common, and among the new ones, those described in Patent Document 1 are known.

[0003] The food packaging bag 1' includes a bag body 10' and a header portion 15'. The bag body 10' is formed by overlapping a pair of sheets 2', 3' having a shape in which the other end side is wider than one end side, and is sealed on three sides by a top joint portion 11' at one end side and side joint portions 12', 12' at both side edges, and the other end side is an opening 13'. The header portion 15' is formed by joining and integrating the protruding pieces of the sheets 2', 3' protruding from the top joint portion 11' at appropriate positions.

[0004] In the second sheet 3' of the header portion 15', for example, an inverted U-shaped cut line 32' is formed, and an opening piece 33' having the cut line 32' as an outer contour line is formed. On the inner surface of the second sheet 3', an opening strip 34' such as a cut tape is joined from the opening piece 33' to the other end side of the second sheet 3'.

[0005] When eating the food packaged in the food packaging bag 1', as shown in FIG. 38(b), in the food package 6', the opening piece 33' is picked and pulled down. Then, the opening strip 34' is pulled, a split release portion is formed in the second sheet 3', and the food can be taken out from this split release portion.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the sheet used for conventional food packaging bags is a plastic sheet. Since the plastic sheet has low plasticity, it tries to return to its original flat state even when bent. For this reason, at each side of the food package, the sheet does not bend sharply and tends to be rounded. Therefore, in conventional food packaging bags, there has been a problem that there are drawbacks in stability and, by extension, self-standing ability in the state of being a food package.

[0008] Therefore, in view of such circumstances, the present invention has been made, and an object thereof is to provide a food packaging bag capable of obtaining suitable stability and self-standing ability in the state of being a food package.

Means for Solving the Problems

[0009] The food packaging bag according to the present invention has a shape in which the other end side is wider than one end side in the first direction Comprising a first sheet and a second sheet having a shape that is wider on the other end side than on one end side in the first direction and to which an opening strip is joined to the inner surface from one end side to the other end side in the first direction is provided with a bag body in which a pair of sheets are overlapped, and three sides are sealed by a top joint portion at one end side and side joint portions at both side portions, and the other end side is an opening First and second Each of the sheets of the sheet is partitioned into a plurality of regions in the first direction and the same number of regions as the other sheet, and a plurality of Divided sheets are used to form one sheet so that two adjacent regions are different sheets satisfies the following conditions (A), (B) and (C) and The divided sheet in the region through which the opening strip passes is provided with easily breakable portions on both sides of the opening strip at the edge facing one end side in the first direction It is a food packaging bag. (A) First and secondOn the premise that the sheet partly includes a paper sheet or a cellophane sheet, each region has a sheet of a different material among a plastic sheet, a paper sheet, or a cellophane sheet Divided of any of the sheets Divided is selectively used (B) Of the first and second sheets For two adjacent regions of each sheet, sheets of different materials Divided are used (C) Sheets corresponding in order in the first direction First and second of the Each regions have sheets of different materials Divided used

[0010] Here, as one aspect of the food packaging bag according to the present invention, the number of regions is three, First and second In one of the sheets of the sheet, a paper sheet or a cellophane sheet Of the divided sheets is used for the first region and the third region, and a plastic sheet Of the divided sheets is used for the second region, First and second In the other sheet of the sheet, a plastic sheet Of the divided sheets is used for the first region and the third region, and a paper sheet or a cellophane sheet Of the divided sheets is used for the second region can adopt the configuration with

[0011] Another food packaging bag according to the present invention has a shape in which the other end side is wider than one end side in the first direction Comprising a first sheet and a second sheet having a shape that is wider on the other end side than on one end side in the first direction and to which an opening strip is joined to the inner surface from one end side to the other end side in the first direction A pair of sheets are overlapped, and a bag body is provided in which three sides are sealed by a top joint portion at one end side and side joint portions at both side portions, and the other end side is an opening First and second Each sheet of the sheet is partitioned into a plurality of regions in the first direction and a different number of regions from the other sheet, and a plurality of Divided sheets are used to form one sheet so that two adjacent regions are different sheets, satisfy the following conditions (A) and (B)and The divided sheet in the region through which the opening strip passes is provided with easily breakable portions on both sides of the opening strip at the edge facing one end side in the first direction It is a food packaging bag. (A) First and second On the premise that the sheet of (A) is partially provided with a paper sheet or a cellophane sheet, each region has a sheet of a different material of a plastic sheet, a paper sheet, or a cellophane sheet Divided of any Divided sheet is selectively used (B) Of the first and second sheets In two adjacent regions of each sheet, sheets of different materials Divided are used

Advantages of the Invention

[0012] As described above, according to the food packaging bag according to the present invention, since the pair of sheets are partially provided with a paper sheet or a cellophane sheet, suitable stability and self-standing property can be obtained in the state of the food package.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0014] <Outline of the Food Packaging Bag> First, prior to the specific description of each embodiment of the food packaging bag according to the present invention, matters common to each embodiment will be described.

[0015] As shown in FIGS. 1 to 3, the food packaging bag 1 includes a bag body 10 and a header portion 15. The bag body 10 is formed by overlapping and joining a pair of sheets (a first sheet 2 and a second sheet 3). The first sheet 2 is also referred to as the front sheet, and the second sheet 3 is also referred to as the back sheet. The pair of sheets has a shape in which one direction orthogonal to each other is longer than the other, and a shape in which the other end side is wider than the one end side. The bag body 10 is joined and sealed on three sides by a top joining portion 11 on one end side and side joining portions 12, 12 on both side portions, and the other end side becomes an opening 13. The header portion 15 is formed by joining and integrating the protruding pieces of the respective sheets 2, 3 protruding from the top joining portion 11 at appropriate positions. Hereinafter, the above one direction (in FIGS. 2 and 3, the vertical direction) is referred to as the "longitudinal direction" or "first direction", and the above other direction (in FIGS. 2 and 3, the horizontal direction) is referred to as the "width direction" or "second direction".

[0016] The first sheet 2 includes a body portion 20 and a tip portion 21 (the above protruding piece). The body portion 20 has a shape that gradually widens from one end side to the other end side. The tip portion 21 has a narrow shape extending from one end of the body portion 20.

[0017] The second sheet 3 includes a body portion 30 and a tip portion 31 (the above protruding piece). The body portion 30 has a shape that gradually widens from one end side to the other end side. The tip portion 31 has a narrow shape extending from one end of the body portion 30.

[0018] The body portions 20, 30 are trapezoidal. Therefore, one end of the body portions 20, 30 (and the other end of the tip portions 21, 31 corresponding thereto) is linear and orthogonal to the longitudinal direction. In other words, one end of the body portions 20, 30 is linear and parallel to the width direction. Both side edges of the body portions 20, 30 are linear and inclined with respect to the longitudinal direction. However, the other end sides of both side edges of the body portions 20, 30 are missing due to the cutout portions 14. As a result, the other end sides of the body portions 20, 30 are made narrower by the amount of the cutout portions 14.

[0019] The top joint portion 11 is formed by heat-sealing the first and second sheets 2 and 3 along one end of the body portions 20 and 30. In this example, the top joint portion 11 is formed by welding using a heat-sealing bar and is a strip seal having a predetermined width.

[0020] The side joint portion 12 is formed by heat-sealing the first and second sheets 2 and 3 along the side edges (hypotenuses) of the body portions 20 and 30 and the side edges (vertical sides) of the tip portions 21 and 31. In this example, the side joint portion 12 is formed by welding using a heat-sealing bar and is a strip seal having a predetermined width. The width of the side joint portion 12 is smaller than the width of the top joint portion 11. Specifically, the side joint portion 12 has a width of 2 mm or more, more preferably 3 mm or more, and 5 mm or less, more preferably 4 mm or less. Note that the side joint portion 12 is a strip seal formed along the side edges of the body portions 20 and 30 and the side edges of the tip portions 21 and 31. For this reason, the side joint portion 12 is a strip seal that is bent at an intermediate portion, that is, at the intersection with the top joint portion 11.

[0021] The inside of the bag body 10 configured in this way becomes the food storage portion. An inner sheet 4 is adhered to the inner surface of the first sheet 2 in the bag body 10. The inner sheet 4 has, for example, the other end joined at two locations by point seals or the like (joint portion 40), and one end side is a free end. Thereby, even if the food moves in the storage portion, the inner sheet 4 adheres to the surface of the food and follows its movement. For this reason, the first sheet 2 is not soiled and the appearance is not impaired.

[0022] The food packaging bag 1 has the above configuration. Next, a method for packaging food using the food packaging bag 1 will be described. Note that in FIGS. 4 and 5 used for the description, the width of the side joint portion 12 is not shown. First, as shown in FIG. 4(a), air at a predetermined pressure is blown into the bag body 10 from the opening 13 by a blower (not shown), or the opening 13 side of the first sheet 2 is sucked and lifted by a suction head (not shown), etc., so that the opening 13 is opened. Then, in this state, the sandwich S is inserted into the bag body 10.

[0023] When the sandwich S is accommodated in the bag body 10, as shown in FIG. (b) of the same figure, the opening shape of the opening 13 becomes a rectangular shape. The portions straddling the respective side joint portions 12 of the first sheet 2 and the second sheet 3 become a pair of opposing triangular side faces. The middle portion of the first sheet 2 becomes a rectangular front face portion. The middle portion of the second sheet 3 becomes a rectangular back face portion.

[0024] After the sandwich S is accommodated in the bag body 10, as shown in FIG. (c) of the same figure, first, among the excess sheet pieces of the opening 13 (the sheet pieces protruding from the bottom surface of the sandwich S), the sheet piece of the second sheet 3 (the sheet piece of the back face portion) is folded so as to cover the bottom surface of the sandwich S. Next, as shown in FIG. 5(a), one of the left and right sheet pieces (the sheet piece of one side face portion) is folded so as to overlap the previously folded second sheet 3. Next, as shown in FIG. (b) of the same figure, the other sheet piece of the left and right (the sheet piece of the other side face portion) is folded so as to overlap the previously folded second sheet 3. Next, as shown in FIG. (c) of the same figure, the remaining sheet piece of the first sheet 2 (the sheet piece of the front face portion) is folded so as to overlap the previously folded left and right sheet pieces. Thereby, the opening 13 of the food packaging bag 1 is closed.

[0025] However, first, the sheet piece of the front face portion may be folded, then the sheet piece of the side face portion may be folded, and finally the sheet piece of the back face portion may be folded, or first, either the sheet piece of the back face portion or the front face portion may be folded, then the other of the sheet piece of the back face portion or the front face portion may be folded, and finally the sheet piece of the side face portion may be folded, or first, the sheet piece of the side face portion may be folded, then either the sheet piece of the back face portion or the front face portion may be folded, and finally the other of the sheet piece of the back face portion or the front face portion may be folded, etc. The order of folding the four sheet pieces is not particularly limited.

[0026] When the opening 13 is closed, the tape 7 is adhered and the opening 13 is sealed. Alternatively, the opening 13 may be sealed by adhering a label or joining a predetermined portion where sheet pieces are folded and overlapped by heat sealing or the like.

[0027] Through the above steps, as shown in FIG. 6, the food packaging body six is completed. The food packaging body six is maintained in an airtight state by the top joint portion 11, a pair of side joint portions 12, 12, and the closing portion (bottom surface portion) of the sealed opening 13. For this reason, outside air or the like does not enter the inside, and the packaged sandwich S maintains the intended quality.

[0028] Next, a method for manufacturing the food packaging bag 1 (bag-making process) will be described. As shown in FIG. 7, the bag-making process includes: i) a first pre-step of preparing a first continuous sheet stock 2X of the first sheet 2; ii) a second pre-step of preparing a second continuous sheet stock 3X of the second sheet 3; overlapping the first sheet stock 2X and the second sheet stock 3X so that their inner surfaces face each other, and intermittently conveying them in this state; iii) a step of forming the top joint portion 11 (first step); iv) a step of forming the side joint portion 12 (second step, this may be performed simultaneously with the first step); v) a step of individually separating the food packaging bag 1 so as to cut and divide the side joint portion 12 along the intermediate line of the side joint portion 12 (third step); and vi) a step of forming the notch portion 14 (fourth step).

[0029] Note that this type of food packaging bag 1 having a trapezoidal shape is manufactured so as to be transverse and have opposite directions alternately with respect to the conveying direction of the sheet stocks 2X and 3X. That is, a food packaging bag 1 in which the opening 13 is formed on one side in the width direction (TD) orthogonal to the conveying direction (MD) of the sheet stocks 2X and 3X and the header portion 15 is formed on the other side in the width direction, and a food packaging bag 1 in which the opening 13 is formed on the other side in the width direction and the header portion 15 is formed on one side in the width direction are alternately manufactured. In FIG. 7, the configuration related to the former food packaging bag 1 is denoted by adding "A" after the reference numeral, and the configuration related to the latter food packaging bag 1 is denoted by adding "B" after the reference numeral.

[0030] The overall flow of the bag-making process is generally the same as that described in JP-A-2005-219319. However, in what is described in this patent document, the side joint is formed by fusing. In contrast, in this example, the side joint 12 is formed by welding and cutting. For welding, a heat-seal bar having a width that is twice the width of the side joints 12, 12 of the adjacent food packaging bags 1, 1, that is, the width of the side joint 12, is used.

[0031] <Region Division> At least one of the pair of sheets 2, 3 is divided into a plurality of regions in the longitudinal direction. Hereinafter, typical patterns regarding this region division will be described. In the following description, the case where the first sheet 2 (the first sheet web 2X) is divided into a plurality of regions is described. When the second sheet 3 (the second sheet web 3X) is also divided into a plurality of regions, the description will be omitted assuming it is the same as the description for the first sheet 2 (the first sheet web 2X).

[0032] <Region Division Pattern A> As shown in FIG. 8, the first sheet 2 is divided into three regions: an upper part 22, a middle part 23, and a lower part 24. The upper part 22 is divided into the upper part and the tip part 21 of the body part 20. The lower part 24 is divided into the lower part of the body part 20. The middle part 23 is divided between the upper part 22 and the lower part 24, that is, the middle part of the body part 20. The upper part 22 and the lower part 24 have the same height dimension.

[0033] The first sheet 2 is formed by overlapping the edges of three sheets (the middle split sheet 26 and the upper and lower end split sheets 26, 26) (the overlapping part 27), and joining the overlapping part 27 by heat sealing to form one sheet. In the overlapping part 27, the edge of the end split sheet 26 is arranged on the outer surface side of the edge of the middle split sheet 26, and the edge of the middle split sheet 26 and the edge of the end split sheet 26 are overlapped so that the outer surface of the edge of the middle split sheet 26 faces the inner surface of the edge of the end split sheet 26. However, which edge of the adjacent sheets is arranged on the outer surface side and which edge is arranged on the inner surface side should be appropriately selected according to the properties and design of the adjacent sheets (the same applies hereinafter).

[0034] Next, a method for manufacturing a sheet web related to the region division pattern A will be described. As shown in FIG. 9, a sheet web roll in which a continuous split sheet web 26X of the middle split sheet 26 is wound in a roll shape, and a sheet web roll in which a continuous split sheet web 26X of the end split sheet 26 is wound in a roll shape are each rotatably held. The pair of end split sheet webs 26X, 26X have the same width. The middle split sheet web 26X and the pair of end split sheet webs 26X, 26X are fed out and supplied from each sheet web roll. The pair of end split sheet webs 26X, 26X are supplied so as to sandwich the middle split sheet web 26X, and the side edges of the middle split sheet web 26X and the side edges of the end split sheet web 26X are overlapped (the overlapping part 27), and the overlapping part 27 is joined by heat sealing to form one sheet web.

[0035] As shown in FIG. 10, the method for manufacturing the food packaging bag 1 using the sheet web related to the area division pattern A and including the sheet related to the area division pattern A is the same as the method for manufacturing the food packaging bag 1 described above. Therefore, in adjacent food packaging bags 1, 1, i) the intermediate split sheet 26 related to the middle section 23 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle section 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate split sheet web 26X), and ii) the end split sheet 26 related to the upper section 22 of the first sheet 2 of one food packaging bag 1 and the end split sheet 26 related to the lower section 24 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (end split sheet web 26X).

[0036] <Area division pattern B> As shown in FIG. 11, the first sheet 2 is divided into three regions: an upper section 22, a middle section 23, and a lower section 24. The difference from the sheet related to the area division pattern A is that the height dimension of the lower section 24 is smaller than the height dimension of the upper section 22.

[0037] The method for manufacturing the sheet web related to the area division pattern B is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 12, the method for manufacturing the food packaging bag 1 using the sheet web related to the area division pattern B and including the sheet related to the area division pattern B is the same as the method for manufacturing the food packaging bag 1 using the sheet web related to the area division pattern A and including the sheet related to the area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the intermediate split sheet 26 related to the middle section 23 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle section 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate split sheet web 26X), and ii) the end split sheet 26 related to the upper section 22 of the first sheet 2 of one food packaging bag 1 and the end split sheet 26 related to the lower section 24 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (end split sheet web 26X).

[0038] However, by shifting the opening 13 of the food packaging bag 1 to the center in the width direction of the sheet webs 2X and 3X (in this example, the center in the width direction of the sheet webs 2X and 3X coincides with the center in the width direction of the intermediate divided sheet web 26X), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X and 3X. Also, for this reason, as described above, in the food packaging bag 1, the height dimension of the lower part 24 is smaller than the height dimension of the upper part 22.

[0039] Among the manufacturing methods, for the step of individually separating the food packaging bag 1 (the third step) and the step of forming the notch 14 (the fourth step) so as to cut and divide the side joint 12 along the intermediate line of the side joint 12, first, after dividing the sheet webs 2X and 3X along the intermediate line of the side joint 12, it may be a method of trimming the outer contour line so as to form the shape of the food packaging bag 1 including the fourth step, or it may be a method of punching out the food packaging bag 1 using a Thomson blade (a full - circumference Thomson blade) (the same applies hereinafter).

[0040] <Region division pattern C> As shown in FIG. 13, the first sheet 2 is divided into three regions: an upper part 22, a middle part 23, and a lower part 24. The difference from the sheet related to the region division pattern A is that the height dimension of the upper part 22 is smaller than the height dimension of the lower part 24.

[0041] The method for manufacturing the sheet web related to the area division pattern C is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 14, the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern C using the sheet web related to the area division pattern C is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern A using the sheet web related to the area division pattern A. Therefore, in the adjacent food packaging bags 1, 1, i) the intermediate divided sheet 26 related to the middle part 23 of the first sheet 2 of one food packaging bag 1 and the intermediate divided sheet 26 related to the middle part 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate divided sheet web 26X), and ii) the end divided sheet 26 related to the upper part 22 of the first sheet 2 of one food packaging bag 1 and the end divided sheet 26 related to the lower part 24 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (end divided sheet web 26X).

[0042] However, by shifting the header part 15 of the food packaging bag 1 to the side of the width direction center of the sheet webs 2X, 3X (in this example, the width direction center of the sheet webs 2X, 3X coincides with the width direction center of the intermediate divided sheet web 26X), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X, 3X. Also, for this reason, as described above, in the food packaging bag 1, the height dimension of the upper part 22 is smaller than the height dimension of the lower part 24.

[0043] <Area division pattern D> As shown in FIG. 15, the first sheet 2 is divided into five regions: an upper part 22, a middle first part 23, a middle second part 23, a middle third part 23, and a lower part 24.

[0044] The method for manufacturing the sheet web related to the region division pattern D is the same as the method for manufacturing the sheet web related to the region division pattern A. Also, as shown in FIG. 16, the method for manufacturing the food packaging bag 1 provided with the sheet related to the region division pattern D using the sheet web related to the region division pattern D is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the region division pattern A using the sheet web related to the region division pattern A. For this reason, in adjacent food packaging bags 1, 1, i) the intermediate split sheet 26 related to the middle two-step portion 23 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle two-step portion 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate split sheet web 26X), ii) the end split sheet 26 related to the upper step portion 22 of the first sheet 2 of one food packaging bag 1 and the end split sheet 26 related to the lower step portion 24 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (end split sheet web 26X), iii) the intermediate split sheet 26 related to the middle one-step portion 23 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle three-step portion 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate split sheet web 26X).

[0045] However, by shifting the header portion 15 of the food packaging bag 1 to the side of the center in the width direction of the sheet webs 2X, 3X (in this example, the center in the width direction of the sheet webs 2X, 3X coincides with the center in the width direction of the intermediate split sheet web 26X related to the middle two-step portion 23), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X, 3X.

[0046] <Region division pattern E> As shown in FIG. 17, the first sheet 2 is divided into five regions: an upper step portion 22, a middle one-step portion 23, a middle two-step portion 23, a middle three-step portion 23, and a lower step portion 24. The difference from the sheet related to the region division pattern D is that the split sheet 26 is attached to the entire sheet 25.

[0047] The method for manufacturing the sheet web related to the area division pattern E is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 18, the method for manufacturing the food packaging bag 1 including the sheet related to the area division pattern E using the sheet web related to the area division pattern E is the same as the method for manufacturing the food packaging bag 1 including the sheet related to the area division pattern A using the sheet web related to the area division pattern A. Therefore, in the adjacent food packaging bags 1, 1, i) the intermediate divided sheet 26 related to the middle one-stage portion 23 of the first sheet 2 of one food packaging bag 1 and the intermediate divided sheet 26 related to the middle three-stage portion 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (the intermediate divided sheet web 26X).

[0048] However, by shifting the header portion 15 of the food packaging bag 1 to the side of the width direction center of the sheet webs 2X, 3X (in this example, the width direction center of the sheet webs 2X, 3X coincides with the width direction center of the entire sheet web 25X), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X, 3X).

[0049] <Area division pattern F> As shown in FIG. 19, the first sheet 2 is divided into four regions: an upper stage portion 22, a middle one-stage portion 23, a middle two-stage portion 23, and a lower stage portion 24.

[0050] The method for manufacturing the sheet web related to the area division pattern F is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 20, the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern F using the sheet web related to the area division pattern F is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern A using the sheet web related to the area division pattern A. For this reason, in the adjacent food packaging bags 1, 1, i) the intermediate split sheet 26 related to the middle one-step portion 23 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle one-step portion 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (the intermediate split sheet web 26X), and ii) the end split sheet 26 related to the upper step portion 22 of the first sheet 2 of one food packaging bag 1 and the intermediate split sheet 26 related to the middle two-step portion 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (the intermediate split sheet web 26X).

[0051] However, by shifting the header portion 15 of the food packaging bag 1 to the center in the width direction of the sheet webs 2X, 3X (in this example, the center in the width direction of the sheet webs 2X, 3X coincides with the center in the width direction of the intermediate split sheet web 26X related to the middle one-step portion 23), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X, 3X.

[0052] <Area division pattern G> As shown in FIG. 21, the first sheet 2 is divided into four regions: an upper step portion 22, a middle one-step portion 23, a middle two-step portion 23, and a lower step portion 24. The difference from the sheet related to the area division pattern F is that the split sheet 26 is attached to the entire sheet 25.

[0053] The method for manufacturing the sheet web related to the area division pattern G is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 22, the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern G using the sheet web related to the area division pattern G is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern A using the sheet web related to the area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the divided sheet 26 at the end related to the upper stage part 22 of the first sheet 2 of one food packaging bag 1 and the intermediate divided sheet 26 related to the middle two-stage part 23 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (the intermediate divided sheet web 26X).

[0054] However, by shifting the header part 15 of the food packaging bag 1 to the side of the center in the width direction of the sheet webs 2X, 3X (in this example, the center in the width direction of the sheet webs 2X, 3X coincides with the center in the width direction of the entire sheet web 25X), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X, 3X.

[0055] <Area division pattern H> As shown in FIG. 23, the first sheet 2 is divided into two areas: the upper stage part 22 and the lower stage part 24.

[0056] The method for manufacturing the sheet web related to the area division pattern H is the same as the method for manufacturing the sheet web related to the area division pattern A. Also, as shown in FIG. 24, the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern H using the sheet web related to the area division pattern H is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the area division pattern A using the sheet web related to the area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the divided sheet 26 at the end related to the upper stage part 22 of the first sheet 2 of one food packaging bag 1 and the divided sheet 26 at the end related to the upper stage part 22 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (the intermediate divided sheet web 26X).

[0057] However, by shifting the header portion 15 of the food packaging bag 1 toward the center in the width direction of the sheet webs 2X and 3X (in this example, the center in the width direction of the sheet webs 2X and 3X coincides with the center in the width direction of the intermediate divided sheet web 26X related to the upper portion 22), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X and 3X.

[0058] <Region division pattern I> As shown in FIG. 25, the first sheet 2 is divided into two regions, an upper portion 22 and a lower portion 24. The difference from the sheet related to the region division pattern H is that a divided sheet 26 is attached to the entire sheet 25.

[0059] The method for manufacturing the sheet web related to the region division pattern I is the same as the method for manufacturing the sheet web related to the region division pattern A. Further, as shown in FIG. 26, the method for manufacturing the food packaging bag 1 provided with the sheet related to the region division pattern I using the sheet web related to the region division pattern I is the same as the method for manufacturing the food packaging bag 1 provided with the sheet related to the region division pattern A using the sheet web related to the region division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the divided sheet 26 at the end related to the upper portion 22 of the first sheet 2 of one food packaging bag 1 and the divided sheet 26 at the end related to the upper portion 22 of the first sheet 2 of the other food packaging bag 1 are composed of the same sheet (intermediate divided sheet web 26X).

[0060] However, by shifting the header portion 15 of the food packaging bag 1 toward the center in the width direction of the sheet webs 2X and 3X (in this example, the center in the width direction of the sheet webs 2X and 3X coincides with the center in the width direction of the entire sheet web 25X), the food packaging bag 1 has a height dimension smaller than the width of the sheet webs 2X and 3X.

[0061] <Material of the sheet> For each region and the other sheet (single sheet) when not divided into a plurality of regions, any one of the sheets of different materials listed below is selectively used.

[0062] <Plastic sheet> The sheet is a plastic sheet (film) having heat weldability such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. As an example, the sheet is a biaxially oriented polypropylene (OPP) sheet (film) or an unoriented polypropylene (CPP) sheet (film). Alternatively, the sheet is a laminated sheet (film). As one form of the laminated sheet (film), the sheet is formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface side. As the base material layer, resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. Note that the polypropylene sheet (film) includes not only a polypropylene sheet (film) with a purity of 100%, but also a sheet (film) containing polypropylene as the main component and other components (for example, other resin components such as polyethylene). Note that the "sheet" is not defined by thickness and is a concept including the film (the same applies hereinafter).

[0063] <Paper sheet> The sheet is made of paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, paper-like or paper-like materials (collectively referred to as "paper"), or a sheet (film) mainly composed of these (collectively referred to as "paper sheet" (film)). The paper may be paper containing bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET). The sheet may have heat-sealability on the inner surface side, either entirely or partially at necessary locations, as required. For example, the sheet is a laminated sheet (film) laminated with a paper outer layer and a plastic sheet (film) inner layer. As one form of the laminated sheet (film), the sheet is formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface side. Paper is used as the base material layer. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. As an example, the base material layer is paper with a basis weight of about 12 g / m 2 or about 15 g / m 2 and the adhesive layer is dry lamination, and the resin layer is biaxially oriented polypropylene (OPP).

[0064] <Cellophane sheet> The sheet is made of ordinary cellophane, moisture-proof cellophane, cellophane-like or cellophane-like materials (collectively referred to as "cellophane"), or a sheet (film) mainly composed of these (collectively referred to as "cellophane sheet" (film)). The sheet may have heat-sealability on the inner surface side, either entirely or partially at necessary locations, as required. For example, the sheet is a laminated sheet (film) laminated with a cellophane outer layer and a plastic sheet (film) inner layer. As one form of the laminated sheet (film), the sheet is formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface side. Cellophane is used as the base material layer. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. As an example, the base material layer is ordinary cellophane or moisture-proof cellophane, the adhesive layer is dry lamination, and the resin layer is biaxially oriented polypropylene (OPP).

[0065] <Method of opening> The food packaging bag 1 is provided with an opening means. There are various types of opening means, such as the following.

[0066] <Opening method A> As shown in FIG. 27, a cut line 32 is formed in the second sheet 3 in the header portion 15. Then, the formation of the cut line 32 forms a tear-off tab 33 in the second sheet 3 in the header portion 15. The tear-off tab 33 has the cut line 32 as its outline, a fixed end between both end points, and a free end at one end. In this example, the cut line 32 is formed in an inverted U shape. As a result, the tear-off tab 33 becomes an upward tongue-like piece.

[0067] The second sheet 3 is provided with a tearing strip 34. The tearing strip 34 is provided on the inner surface of the second sheet 3, extending from the tearing piece 33 to the other end of the second sheet 3. The tearing strip 34 is provided, for example, in the center of the width of the second sheet 3 along the longitudinal direction. The tearing strip 34 is joined to the inner surface of the second sheet 3 by heat sealing, adhesive, or the like. As an example, the tearing strip 34 is joined to the inner surface of the second sheet 3 by heat sealing or self-adhesive after a coating agent is applied to this inner surface (the surface facing the second sheet 3). The tearing strip 34 is, for example, a cutting tape or thread. In this example, the tearing strip 34 is a strip-shaped cutting tape having a width of 5 mm or more, or 10 mm or more. Cut tape is made by cutting thin strips of heat-weldable plastic sheets such as biaxially oriented polyester, polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and biaxially oriented polypropylene (OPP).

[0068] When eating the sandwich S, pick up and pull down the opening piece 33. The opening piece 33 is joined to one end of the opening strip 34. Therefore, when the opening piece 33 is picked up and pulled down, the opening strip 34 is pulled, the second sheet 3 is broken along both side edges of the opening strip 34, and a divided opening portion is formed in the second sheet 3. The sandwich S can be taken out from this divided opening portion.

[0069] When the second sheet 3 is partitioned into a plurality of regions, as shown in FIG. 28, the opening strip 34 also needs to break the overlapping portion 27 of the sheets 26, 26. In order to smoothly break this overlapping portion 27, a breakable portion is formed at the edge facing the opening piece 33 among the edges of the two sheets 26, 26 in the overlapping portion 27. The breakable portion in FIG. 28(a) is a cut line 28 formed at a predetermined length along the opening strip 34 from the edge of the edge on both sides of the opening strip 34. Alternatively, it may be a notch cut from the edge of the edge on both sides of the opening strip 34. The breakable portion in FIG. 28(b) is a breakable processing portion 29 composed of a group of fine scratches or the like.

[0070] <Opening means B> The opening means B includes an opening portion which is an opening line or an opening capable of forming an opening, and an outer sheet which is joined to the sheet by covering the opening portion from the outer surface side of the sheet and has a picking portion. Hereinafter, each example of the opening means B will be described.

[0071] <Opening means B-1> As shown in Fig. 29(a), an opening line 35 is formed in the second sheet 3 of the bag body 10 as an opening part. The opening line 35 is provided in a wide band-shaped region from the vicinity of the top joint part 11 toward the other end side of the second sheet 3 at the central part in the width direction of the second sheet 3. Considering the ease of taking out the contents (sandwich), an appropriate value of 10 mm or more, or 15 mm or more, or 30 mm or more, or 40 mm or more is selected according to the width size of the contents. However, as described in the opening means B-2 to be described later, if a left-right opening structure is provided, the width of the opening part may be smaller than these values. Also, from the viewpoint of securing the bonding margin of the outer sheet 5 to the second sheet 3 to be described later, the width of the opening part is 90% or less, or 85% or less, or 80% or less of the width of the top joint part 11 (the length of the inner edge of the top joint part 11 with the intersection of the inner edge of the side joint part 12 as both end points, which corresponds to the width of the storage part of the food package 6 or the width of the sandwich 6).

[0072] The opening part is composed of a first opening line 35a and a second opening line 35b. The first opening line 35a is formed in the vicinity of the top joint part 11 and is a cut line having a shape that gradually becomes wider toward the other end side of the second sheet 3. In this example, the first opening line 35a is a chevron-shaped (inverted V-shaped) cut line that slopes so that one end overlaps and gradually becomes wider. The second opening line 35b is a pair of perpendicular and parallel linear cut lines extending from both ends of the first opening line 35a toward the other end side of the second sheet 3.

[0073] As shown in FIG. 29(b), the opening line 35 is a full cut line that penetrates the front and back of the second sheet 3 over its entire length. Alternatively, as shown in FIG. 29(c), the opening line 35 is a cut line having a connecting portion 37 that connects the inner region (free strip piece 36) and the outer region of the opening line 35 of the second sheet 3 with a narrow width of about 0.1 mm to 3 mm at one location on the left and right sides on the top joint portion 11 side (in the illustrated example, the intersection of the first opening line 35a and the second opening line 35b). Alternatively, as shown in FIG. 29(d), the opening line 35 is a cut line having the connecting portion 37 at appropriate wide intervals (in the illustrated example, one location on the left and right sides on the top joint portion 11 side and one location of each second opening line 35b). Alternatively, as shown in FIG. 29(e), the opening line 35 is a cut line in a zigzag or broken line shape.

[0074] An outer sheet 5 is provided on the outer surface of the second sheet 3. The outer sheet 5 functions as a sealing material for preventing outside air, foreign substances, etc. from entering inside through the opening line 35 by covering and sealing the opening portion (opening line 35) from the outer surface side of the second sheet 3. The outer sheet 5 is provided in a wide strip-shaped region extending from the vicinity of the top joint portion 11 toward the other end side of the second sheet 3 at the center in the width direction of the second sheet 3. The width of the outer sheet 5 is 105% or more, or 110% or more, or 115% or more of the width of the opening portion from the viewpoint of ensuring the bonding margin for the second sheet 3.

[0075] The outer sheet 5 includes a main body portion 50 and a knob portion 51. The main body portion 50 has a shape of a size capable of enclosing the opening line 35 and is joined to the outer surface of the second sheet 3. The knob portion 51 protrudes from the main body portion 50 toward one end side of the second sheet 3 and is not joined to the second sheet 3. In this example, the outer sheet 5, the main body portion 50, and the knob portion 51 are each rectangular.

[0076] The outer sheet 5 is obtained by cutting a plastic sheet into a predetermined shape. Alternatively, the outer sheet 5 may be a paper sheet or a cellophane sheet. The main body portion 50 is joined to the outer surface of the second sheet 3 so as to cover the opening line 35. In this example, the outer sheet 5 is a polyethylene terephthalate (PET) sheet. As an example, the outer sheet 5 is coated with a coating agent over the entire inner surface (the surface facing the second sheet 3) of the main body portion 50, and then joined to the outer surface of the second sheet 3 by heat sealing or self - adhesion.

[0077] The outer sheet 5 also functions as an opening sheet by being joined to the free - strip piece 36 of the second sheet 3. That is, the outer sheet 5 is joined to the second sheet 3 with an appropriate seal strength such that it is peelable from the outer region of the free - strip piece 36 (opening line 35) in the second sheet 3, but difficult to peel from the free - strip piece 36 (the inner region of the opening line 35). In this example, the outer sheet 5 is joined to the free - strip piece 36 with difficulty in peeling by one or more inner joining portions 52 formed in a predetermined partial region of the inner region of the opening line 35.

[0078] When eating the sandwich, as shown in FIG. 30, pick up and pull the picking portion 51. The main body portion 50 of the outer sheet 5 is joined to the free - strip piece 36 of the second sheet 3. Therefore, when the picking portion 51 of the outer sheet 5 is picked up and pulled, the free - strip piece 36 is pulled down and an opening 38 is formed in the second sheet 3, and the sandwich can be taken out through this opening 38.

[0079] Moreover, the opening portion (opening line 35) is formed in a vertically long and wide strip - shaped region extending over a wide range of the back surface portion of the food package 6 (excluding the header portion 15, the same applies hereinafter). For this reason, a large opening 38 is formed, and it becomes possible to easily take out the sandwich. Note that due to such an opening portion, in the food package 6, the upper end of the outer sheet 5 is located at a position close to the top joining portion 11, and the lower end of the outer sheet 5 is located at a position close to the bottom surface portion of the food package 6. That is, the outer sheet 5 is disposed almost over the entire height of the back surface portion of the food package 6, and the picking portion 51 is located in the vicinity of the top joining portion 11.

[0080] <Opening method B-2> In the opening means B-1, the first opening line 35a has a shape that gradually widens toward the other end of the second sheet 3, specifically, a mountain shape (inverted V shape). In addition, as shown in FIG. 31 , the opening line 35 has a pair of left and right third opening lines 35c, 35c on the top joint portion 11 side. The third opening line 35c is a opening line that has a component extending outward in the width direction of the second sheet 3. The third opening line 35c is a linear or curved cut line that extends obliquely upward from a predetermined position on the first opening line 35a along a direction inclined with respect to the width direction of the second sheet 3. Alternatively, the third opening line 35c may be a linear or curved cut line that extends outward in the width direction of the second sheet 3 from a predetermined position on the first opening line 35a along the width direction of the second sheet 3. In this example, the third opening line 35c is a linear cut line that extends from the central bending point (intersection of the two lines) of the first opening line 35a in the extension direction of the first opening line 35a.

[0081] If the food package 6 needs to be opened further, the second stage of opening involves opening the second sheet 3 on either side of the opening 38 from the left and right free pieces 39 formed between the first and third tearing lines 35a, 35c. By grasping the left and right free pieces 39 and pulling the second sheet 3 outward in the width direction, the second sheet 3 is torn outward in the width direction starting from the third tearing line 35c, since the third tearing line 35c provides a tearing direction in the width direction. This allows the opening 38 to be opened wider, exposing the sandwich to a larger extent. Note that the second stage of opening may involve opening only one side, or only the other side. Of course, both sides may also be opened like a double door.

[0082] <Opening method B-3> As shown in Fig. 32(a), the opening part is composed of a first opening line 35d and a second opening line 35e. The first opening line 35d is formed in the vicinity of the top joint part 11 and is a horizontal straight cut line along the top joint part 11. The second opening line 35e is a pair of vertical and parallel straight cut lines extending from both ends of the first opening line 35a toward the other end side of the second sheet 3. The opening part and the outer sheet 5 have the same size as the opening part and the outer sheet 5 according to the opening means B-1.

[0083] As shown in Fig. 32(b), the opening line 35 is a full-cut line penetrating the front and back of the second sheet 3 over the entire length. Alternatively, as shown in Fig. 32(c), the opening line 35 is a cut line having a connecting part 37 that connects the inner region (free belt piece 36) and the outer region of the opening line 35 of the second sheet 3 with a narrow width of about 0.1 mm to 3 mm at one location on the left and right sides on the top joint part 11 side (in the illustrated example, the intersection part of the first opening line 35d and the second opening line 35e). Alternatively, as shown in Fig. 32(d), the opening line 35 is a cut line having the connecting part 37 at appropriate intervals with a wider width (in the illustrated example, one location on the left and right sides on the top joint part 11 side and one location on each second opening line 35e). Alternatively, as shown in Fig. 32(e), the opening line 35 is a cut line in a zigzag or broken line shape.

[0084] Also, similar to the opening means B-2, the opening line 35 can also be provided with a pair of left and right third opening lines on the top joint part 11 side. For example, the third opening line is a straight or curved cut line extending obliquely upward from a predetermined part of the first opening line 35d or the second opening line 35e along a direction inclined with respect to the width direction of the second sheet 3. Alternatively, the third opening line is a straight or curved cut line extending outward in the width direction of the second sheet 3 from a predetermined part of the second opening line 35e along the width direction of the second sheet 3. In the latter case, for example, the third opening line is a straight cut line extending in the extension direction of the first opening line 35d from the bending point of the opening line 35 (the intersection of the first opening line 35d and the second opening line 35e).

[0085] <Opening means B-4> As shown in Fig. 33(a), the opening part is composed of a first opening line 35f and a second opening line 35g. The first opening line 35f is formed in the vicinity of the top joint part 11 and the other end side of the second sheet 3, and is a pair of horizontal and parallel linear cut lines along the top joint part 11. The second opening line 35g is a vertical linear cut line connecting the central parts of the pair of first opening lines 35f, 35f. The opening part and the outer sheet 5 have the same size as the opening part and the outer sheet 5 according to the opening means B-1 to B-3.

[0086] When eating the sandwich, as shown in Fig. 33(b), after peeling off the outer sheet 5 from the second sheet 3 (the first-stage opening operation), as the second-stage opening operation, the left and right second sheets 3 of the second opening line 35g are opened left and right from the left and right free pieces 39 formed between the pair of first opening lines 35f, 35f. If the left and right free pieces 39 are pinched and pulled outward in the width direction of the second sheet 3, since the second sheet 3 has a tear direction outward in the width direction due to the first opening line 35f, the second sheet 3 is torn outward in the width direction starting from the first opening line 35f. Thereby, the opening 38 can be opened wide and the sandwich can be largely exposed. Note that for the second-stage opening, only one side on the left and right may be opened, or only the other side may be opened. Of course, both sides may be opened like a double door.

[0087] <Opening means B-5> As shown in Fig. 34, the difference between the opening means B-5 and the opening means B-1 to B-4 lies in the point regarding the opening part. Specifically, in the second sheet 3, the opening 38 is not formed by opening the free strip piece 36 and the left and right free pieces 39 by the opening operation, but rather the free strip piece 36 and the left and right free pieces 39 are absent and the opening 38 is originally formed.

[0088] The opening part (opening 38) is formed in a size corresponding to the back part of the food packaging body 6 in consideration of the ease of taking out the sandwich. Specifically, the opening part is formed in a region offset inward while leaving the joining width with the outer sheet 5 for each side of the back part of the food packaging body 6. For this reason, the opening part and the outer sheet 5 are larger than the opening part and the outer sheet 5 according to the opening means B-1 to B-4. Further, since the outer sheet 5 becomes larger, the main body part 50 of the outer sheet 5 is joined to a position close to the top joining part 11 because the upper end of the opening 38 is located at a position close to the top joining part 11. For this reason, the gripping part 51 of the outer sheet 5 overlaps the top joining part 11 and extends into the header part 15.

[0089] In addition, although a coating agent applied to the outer sheet 5 is one that has no problem in terms of food safety, it is better to avoid direct contact with the sandwich. Therefore, in this example, the coating agent is not applied to the region corresponding to the opening 38 (or a region slightly larger than this) on the inner surface of the outer sheet 5.

[0090] Further, if an opening line similar to the third opening line according to the opening means B-2 is formed on the top joining part 11 side (for example, both left and right corners) of the opening 38 or the other end side (for example, both left and right corners) of the second sheet 3 of the opening 38, the opening 38 can be enlarged. In this case, the opening part and the outer sheet 5 may be the same size as the opening part and the outer sheet 5 according to the opening means B-1 to B-4.

[0091] <Opening means B-6> In the opening means B-1 to B-5, the outer sheet 5 is formed in a size that fits within the back part of the food packaging body 6. However, as shown in Fig. 35(a), the outer sheet 5 may be in a size (length) that extends into the header part 15.

[0092] <Opening means B-7> Also, in the opening means B-1 to B-6, the outer sheet 5 is joined to the second sheet 3 over the entire surface of the main body portion 50 (solid seal). However, as shown in FIG. 35(b), the outer sheet 5 may be joined to the second sheet 3 by a frame-shaped outer joint portion 53 surrounding the opening line 35. In the illustrated example, the outer joint portion 53 is in the form of a band having a predetermined width and is formed inwardly from the outer periphery of the outer sheet 5 with a predetermined width therebetween. As a result, the outer peripheral portion of the outer sheet 5 is a non-joined portion.

[0093] <Opening means B-8> Also, in the opening means B-1 to B-7, the outer sheet 5 is joined to the second sheet 3 by heat sealing. This is possible when the second sheet 3 also has heat weldability on the outer surface side. However, in the form of the opening means B-1 to B-7, the outer sheet may have adhesiveness or adhesivity on the inner surface side and be releasably adhered or adhered to the second sheet. This is effective when the second sheet 3 does not have heat weldability on the outer surface side.

[0094] <Opening means C> As shown in FIG. 36, the opening means C is to open by holding each sheet piece (the tip portion 21 of the first sheet 2 and the tip portion 31 of the second sheet 3) of the header portion 15 and peeling the side joint portion 12.

[0095] <Combination> As described above, the food packaging bag 1 is configured by appropriately selecting from each of a plurality of region partitioning patterns, a plurality of sheet materials, and a plurality of opening means. Examples of the patterns related to the combination are as follows.

[0096]

Table 1

[0097] Note that many of these patterns include patterns in which the lower end portion of the second sheet 3 (the portion on the opening 13 side) is a plastic sheet. As described above, the lower end portion of the second sheet 3 is the portion that is first folded when packaging the sandwich S (see Fig. 4(c)). Since the lower end portion of this second sheet 3 is a plastic sheet that is softer and / or less likely to curl compared to a paper sheet or a cellophane sheet, it can be folded neatly, and as a result, the opening 13 can be surely and neatly closed.

[0098] As described above, according to the food packaging bag 1 according to each of the above embodiments, a paper sheet or a cellophane sheet is used for a part of the first sheet 2 and / or the second sheet 3. Paper sheets and cellophane sheets are more likely to have creases than plastic sheets. For this reason, on each side of the food package 6, the sheets 2 and 3 bend sharply, and the food package 6 exhibits a sharp appearance. Therefore, according to the food packaging bag 1 according to each of the above embodiments, in the state of the food package 6, there is an effect that it has excellent appearance, stability, and thus excellent self-standing property.

[0099] Also, paper sheets and cellophane sheets are more rigid than plastic sheets. As a result, the sheets 2 and 3 are given firmness, and in the state of the food package 6, there is an effect that the self-standing property is improved. Also, due to the firmness of the sheets 2 and 3, the rigidity of the food package 6 is improved. Therefore, according to the food packaging bag 1 according to each of the above embodiments, the effect of preventing the sandwich S from losing its shape is high.

[0100] Also, according to the food packaging bag 1 according to each of the above embodiments, by using a paper sheet or a cellophane sheet, the amount of plastic used can be reduced. In recent years, waste plastic has become a global environmental problem, but according to the food packaging bag 1 according to each of the above embodiments, it is an effective measure against this environmental problem.

[0101] Moreover, according to the food packaging bag 1 according to each of the above embodiments, the side joint portion 12 is formed in a strip shape along the side edges of the bag body 10 and the side edges of the header portion 15 with a predetermined width (and, according to the embodiment related to the region division pattern A etc., in a bent form at the intersection with the top joint portion 11). Thus, in the state of the food package 6, as shown in FIG. 6, the side joint portion 12 will be in a state of falling backward later. Then, since columns can be formed on both sides of the header portion 15, it will be in an upright state. Moreover, the header portion 15 will be in a flat state extending straight from the front portion of the bag body 10. Therefore, according to the food packaging bag 1 according to each of the above embodiments, in the state of the food package 6, the appearance can be improved, and in the state of being displayed in a store such as a convenience store, the display on the header portion 15 can be easily visually recognized.

[0102] Note that the food packaging bag according to the present invention is not limited to the above embodiments, and various modifications are possible without departing from the gist of the present invention.

[0103] In the above embodiments, the paper sheet and the cellophane sheet have heat sealability on the inner surface side. However, the present invention is not limited to this. The paper sheet and the cellophane sheet may have heat sealability not only on the inner surface side but also on the outer surface side.

[0104] Also, in the food packaging bag, the header portion is not essential. For example, a food packaging bag may be configured only with the bag body without a header portion.

[0105] Moreover, terms specifying shapes, parts or states such as "trapezoidal shape", "triangular shape", "rectangular shape", "square shape", "straight line", "central portion", "end portion", "side portion", "equal", "coincide", "parallel", "orthogonal" include, in the present invention, not only the thing itself but also the concept of "substantially" meaning close or similar thereto.

[0106] In addition, in the above embodiment, the food is a sandwich. However, as long as the food to be packaged can be accommodated in a food packaging bag, it may be a Western confectionery such as a cake, a Japanese confectionery such as castella, bread, or a processed rice food such as an onigiri, and the type of food is not particularly limited.

Explanation of Signs

[0107] 1... Food packaging bag, 10... Bag body, 11... Top joint part, 12... Side joint part, 13... Opening part, 14... Notch part, 15... Header part, 2... First sheet, 2X... First sheet original web, 20... Body part, 21... Tip part, 22... Upper part, 23... Middle part, 24... Lower part, 25... Whole sheet, 25X... Whole sheet original web, 26... Divided sheet, 26X... Divided sheet original web, 27... Overlapping part, 28... Cutting line, 29... Easily breakable processing part, 3... Second sheet, 3X... Second sheet original web, 30... Body part, 31... Tip part, 32... Cutting line, 33... Opening piece, 34... Opening strip, 35... Opening line, 35a... First opening line, 35b... Second opening line, 35c... Third opening line, 35d... First opening line, 35e... Second opening line, 35f... First opening line, 35g... Second opening line, 36... Free strip piece, 37... Connecting part, 38... Opening, 39... Left and right free pieces, 4... Inner sheet, 40... Joint part, 5... Outer sheet, 50... Main body part, 51... Knob part, 52... Inner joint part, 53... Outer joint part, 6... Food package, 7... Tape, S... Sandwich

Claims

1. A pair of sheets, including a first sheet having a shape that is wider on the other end side than on one end side in a first direction, and a second sheet having a shape that is also wider on the other end side than on one end side in the first direction and having an opening strip joined to the inner surface from one end side to the other end side in the first direction, are overlapped, and a bag body is provided in which three sides are sealed by a top joint portion on one end side and side joint portions on both side portions, and the other end side is an opening. Each of the first and second sheets is divided into a plurality of regions in the first direction and the same number of regions as the other sheet, and a single sheet is formed using a plurality of divided sheets such that two adjacent regions are different sheets. It satisfies the following conditions (A), (B), and (C). The divided sheet in the region through which the opening strip passes has a breakable portion on the edge facing one end side in the first direction and on both sides of the opening strip. Food packaging bag. (A) On the premise that the first and second sheets partly include a paper sheet or a cellophane sheet, in each region, any one of the divided sheets of different materials of a plastic sheet, a paper sheet, or a cellophane sheet is selectively used. (B) Divided sheets of different materials are used in two adjacent regions of each of the first and second sheets. (C) Divided sheets of different materials are used in the regions of each of the first and second sheets that correspond in order in the first direction.

2. The number of regions is three. In one of the first and second sheets, divided sheets of a paper sheet or a cellophane sheet are used in the first region and the third region, and a divided sheet of a plastic sheet is used in the second region. In the other of the first and second sheets, divided sheets of a plastic sheet are used in the first region and the third region, and a divided sheet of a paper sheet or a cellophane sheet is used in the second region. The food packaging bag according to Claim 1.

3. A pair of sheets, including a first sheet having a shape that is wider on the other end side than on one end side in a first direction, and a second sheet having a shape that is also wider on the other end side than on one end side in the first direction and having an opening strip joined to the inner surface from one end side to the other end side in the first direction, are overlapped, and a bag body is provided in which three sides are sealed by a top joint portion on one end side and side joint portions on both side portions, and the other end side is an opening. Each of the first and second sheets is partitioned into a plurality of regions in the first direction and has a different number of regions than the other sheet, and a single sheet is formed using a plurality of divided sheets such that two adjacent regions are different sheets. It satisfies the following conditions (A) and (B). The divided sheet in the region through which the unsealing strip passes has a breakable portion on both sides of the unsealing strip at the edge facing one end side in the first direction. Food packaging bag. (A) On the premise that the first and second sheets partly include a paper sheet or a cellophane sheet, any one of the divided sheets of different materials, such as a plastic sheet, a paper sheet, or a cellophane sheet, is selectively used for each region. (B) Divided sheets of different materials are used for two adjacent regions of each of the first and second sheets.

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