Food packaging sheets

Abstract

To provide a food packaging sheet that serves as an effective countermeasure against environmental problems caused by waste plastics.SOLUTION: A food packaging sheet 3 is divided into a plurality of regions in a first direction and formed from a single sheet using a plurality of divided sheets so that two adjacent regions form different sheets. Assuming that the food packaging sheet 3 includes a paper sheet or a cellophane sheet in part, the divided sheet of one of a plastic sheet, a paper sheet or a cellophane sheet is selectively used in each region. An opening strip 34 is bonded to an inner surface of the food packaging sheet 3, extending from one end to the other end in the first direction. The divided sheet in a region through which the opening strip 34 passes has easy-tear portions 28, 29 on both sides of the opening strip 34 at an edge facing the one end in the first direction.SELECTED DRAWING: Figure 28

Description

[Technical Field]

[0001] The present invention relates to a food packaging sheet for packaging food. [Background technology]

[0002] There are foods such as sandwiches that have a triangular (mainly right-angled) side shape or a similar shape and are finished into a three-dimensional shape with a specified thickness or width. Food packaging bags for packaging such foods are generally as shown in Figures 37 and 38(a), and a newer one is known as described in Patent Document 1.

[0003] The food packaging bag 1' comprises a bag body 10' and a header portion 15'. The bag body 10' is made by overlapping a pair of sheets 2', 3', each of which has a shape that is wider at one end than at the other end, and is sealed on three sides by a top joint portion 11' at one end and side joint portions 12', 12' on both side edges, with the other end forming an opening 13'. The header portion 15' is made by joining the protruding pieces of the sheets 2', 3' protruding from the top joint portion 11' to each other at appropriate locations and integrating them.

[0004] The second sheet 3' in the header portion 15' has an inverted U-shaped cut line 32', for example, and a tear strip 33' with the cut line 32' as its outline. A tear strip 34' such as cutting tape is joined to the inner surface of the second sheet 3' from the tear strip 33' to the other end of the second sheet 3'.

[0005] When eating food packaged in the food packaging bag 1', the tear strip 33' in the food package 6' is picked up and pulled down as shown in Figure 38(b), and the tear strip 34' is pulled, forming a tearable opening in the second sheet 3', allowing the food to be taken out through this tearable opening. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2017-171326 Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional food packaging bags are made of plastic sheets, and waste plastic has become a global environmental problem in recent years.

[0008] The present invention has been made in view of the above circumstances, and has as its object to provide a food packaging sheet that is an effective solution to the environmental problem of waste plastics. [Means for solving the problem]

[0009] The food packaging sheet according to the present invention comprises: the sheet is divided into a plurality of regions in the first direction, and is made into a single sheet using a plurality of divided sheets so that two adjacent regions are different sheets; On the premise that the sheet has a paper sheet or a cellophane sheet in part, a separate sheet of either a plastic sheet, a paper sheet or a cellophane sheet is selectively used in each region; An opening strip is joined to the inner surface of the sheet from one end side to the other end side in the first direction, The dividing sheet in the region through which the opening strip passes has an edge facing one end side in the first direction and provided with an easily breakable portion on both sides of the opening strip. It is a food packaging sheet.

[0010] Here, as one embodiment of the food packaging sheet according to the present invention, The sheet is made by overlapping the edges of two adjacent divided sheets so that the outer surface of one divided sheet faces the inner surface of the other divided sheet, and joining the overlapping parts to form a single sheet, The easily breakable portion is formed on one of the two edges of the overlapping portion that faces one end side in the first direction. The above configuration can be adopted. Also, in this case, The easily breakable portion is a cut line formed along the opening strip from the edge of the edge facing one end side in the first direction of the two edges of the overlapping portion, but not reaching the edge of the other edge. The above configuration can be adopted.

[0011] As one embodiment of the food packaging sheet according to the present invention, One of the separate sheets located at one end side in the first direction has a tear strip formed by forming a cut line, One end of the tear strip is joined to the inner surface of the tear strip. The above configuration can be adopted. [Effects of the Invention]

[0012] As described above, the present invention can provide a food packaging sheet that is an effective solution to the environmental problem of waste plastics. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an exploded perspective view of a food packaging bag according to each embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the food packaging bag. [Figure 3] FIG. 3 is a rear view of the food packaging bag. [Figure 4] 4(a) to 4(c) are explanatory diagrams showing the process of packaging food using the food packaging bag. [Figure 5] 5(a) to 5(d) are explanatory diagrams continuing from FIG. [Figure 6] FIG. 6 is a perspective view of a food package packaged in a food packaging bag, as viewed from the front side. [Figure 7] FIG. 7 is an explanatory diagram of the bag-making process for food packaging bags. [Figure 8] Fig. 8(a) is a front view of a sheet according to area division pattern A. Fig. 8(b) is a cross-sectional view taken along line AA in Fig. 8(a). [Figure 9] FIG. 9 is an explanatory diagram of the manufacturing process of the raw sheet according to the area division pattern A. [Figure 10] FIG. 10 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern A, using a raw sheet according to area division pattern A. [Figure 11] Fig. 11(a) is a front view of a sheet according to area division pattern B. Fig. 11(b) is a cross-sectional view taken along line BB in Fig. 11(a). [Figure 12] FIG. 12 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern B using a raw sheet according to area division pattern B. [Figure 13] Fig. 13(a) is a front view of a sheet according to area division pattern C. Fig. 13(b) is a cross-sectional view taken along line CC in Fig. 13(a). [Figure 14] FIG. 14 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern C using a raw sheet according to area division pattern C. [Figure 15] Fig. 15(a) is a front view of a sheet according to area division pattern D. Fig. 15(b) is a cross-sectional view taken along line DD in Fig. 15(a). [Figure 16] FIG. 16 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern D, using a raw sheet according to area division pattern D. [Figure 17] Fig. 17(a) is a front view of a sheet according to area division pattern E. Fig. 17(b) is a cross-sectional view taken along line EE in Fig. 17(a). [Figure 18] FIG. 18 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern E, using a raw sheet according to area division pattern E. [Figure 19] Fig. 19(a) is a front view of a sheet according to area division pattern F. Fig. 19(b) is a cross-sectional view taken along line FF in Fig. 19(a). [Figure 20] FIG. 20 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern F, using a raw sheet according to area division pattern F. [Figure 21] Fig. 21(a) is a front view of a sheet according to area division pattern G. Fig. 21(b) is a cross-sectional view taken along line GG in Fig. 21(a). [Figure 22] FIG. 22 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern G using a raw sheet according to area division pattern G. [Figure 23] Fig. 23(a) is a front view of a sheet according to area division pattern H. Fig. 23(b) is a cross-sectional view taken along line HH in Fig. 23(a). [Figure 24] FIG. 24 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern H using a raw sheet according to area division pattern H. [Figure 25] Fig. 25(a) is a front view of a sheet according to area division pattern I. Fig. 25(b) is a cross-sectional view taken along line II in Fig. 25(a). [Figure 26] FIG. 26 is an explanatory diagram of a bag-making process for food packaging bags including a sheet according to area division pattern I using a raw sheet according to area division pattern I. [Figure 27] FIG. 27 is a rear view of a packaging bag for food equipped with opening means A. [Figure 28] 28(a) and (b) are explanatory diagrams of a modified example of the opening means A. FIG. [Figure 29] Figure 29(a) is a front view of the second sheet of a packaging bag for food equipped with opening means B-1, and Figures 29(b) to 29(e) are front views of examples of opening lines provided on the second sheet. [Figure 30] Figure 30(a) is a perspective view of a food package equipped with opening means B-1, as seen from the rear side, and Figure 30(b) is a perspective view of the food package being opened. [Figure 31] Fig. 31(a) is a front view of a tear line formed on the second sheet of a food packaging bag equipped with tearing means B-2, and Fig. 31(b) is a perspective view showing how the food package is opened. [Figure 32]Figure 32(a) is a front view of the second sheet of a packaging bag for food equipped with opening means B-3, and Figures 32(b) to 32(e) are front views of examples of opening lines provided on the second sheet. [Figure 33] Figure 33(a) is a front view of the second sheet of the food packaging bag equipped with opening means B-4, and Figure 33(b) is a perspective view of the food package being opened. [Figure 34] Figure 34(a) is a front view of the second sheet of the food packaging bag equipped with opening means B-5, and Figure 34(b) is a perspective view of the food package being opened. [Figure 35] Figure 35(a) is a front view of the second sheet of a food packaging bag equipped with opening means B-6, and Figure 35(b) is a front view of the second sheet of a food packaging bag equipped with opening means B-7. [Figure 36] FIG. 36 is a perspective view showing how a food package equipped with opening means C is opened. [Figure 37] FIG. 37 is a rear view of a conventional food packaging bag. [Figure 38] Figure 38(a) is a perspective view of a food package packaged in the food packaging bag as seen from the back side, and Figure 38(b) is a perspective view of the food package being opened. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Outline of food packaging bags> First, before specifically describing each embodiment of the food packaging bag according to the present invention, matters common to each embodiment will be described.

[0015] As shown in Figures 1 to 3, the food packaging bag 1 comprises 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 called the front sheet, and the second sheet 3 is also called the back sheet. The pair of sheets are shaped so that one end is longer than the other in mutually orthogonal directions, and the other end is wider than the other end. The bag body 10 is joined and sealed on three sides by a top joint portion 11 at one end and side joint portions 12, 12 on both sides, and the other end forms an opening 13. The header portion 15 is formed by joining the protruding pieces of the sheets 2, 3 protruding from the top joint portion 11 at appropriate locations to form an integrated body. In the following, the one of the directions (the up-down direction in Figures 2 and 3) will be referred to as the "longitudinal direction" or "first direction," and the other of the directions (the left-right direction in Figures 2 and 3) will be referred to as the "width direction" or "second direction."

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

[0017] The second sheet 3 includes a body portion 30 and a tip portion 31 (the protruding piece). The body portion 30 has a shape that gradually widens from one end to the other. The tip portion 31 has a narrow shape that extends 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 that coincide therewith) is linear and perpendicular 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 cutouts 14. As a result, the other end sides of the body portions 20, 30 are narrower by the amount of the cutouts 14.

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

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

[0021] The interior of the bag body 10 constructed in this manner serves as a food storage area. An inner sheet 4 is attached to the inner surface of the first sheet 2 in the bag body 10. The other end of the inner sheet 4 is joined at two points using a point seal or the like (joint 40), and one end is a free end. This allows the inner sheet 4 to adhere to the surface of the food and follow its movement even if the food moves within the storage area. Therefore, the first sheet 2 does not get dirty and its appearance is not damaged.

[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 the width of the side joint portion 12 is not shown in Figures 4 and 5 used for the description. First, as shown in Figure 4(a), the opening 13 is opened by blowing air at a predetermined pressure into the bag body 10 through the opening 13, or by using a suction head (not shown) to suck and lift the opening 13 side of the first sheet 2. Then, in this state, the sandwich S is inserted into the bag body 10.

[0023] When the sandwich S is placed inside the bag body 10, the opening shape of the opening 13 becomes rectangular, as shown in FIG. 1(b). The portions of the first sheet 2 and the second sheet 3 spanning the side joint portions 12 form a pair of opposing triangular side portions. The middle portion of the first sheet 2 forms a rectangular front portion. The middle portion of the second sheet 3 forms a rectangular back portion.

[0024] After the sandwich S is placed in the bag body 10, as shown in FIG. 5(c), first, of the excess sheet pieces (sheet pieces extending beyond the bottom surface of the sandwich S) at the opening 13, the sheet piece (back sheet piece) of the second sheet 3 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 (one of the side sheet pieces) is folded so as to overlap the previously folded second sheet 3. Next, as shown in FIG. 5(b), the other of the left and right sheet pieces (the other side sheet piece) is folded so as to overlap the previously folded second sheet 3. Next, as shown in FIG. 5(c), the remaining sheet piece (front sheet piece) of the first sheet 2 is folded so as to overlap the previously folded left and right sheet pieces. This closes the opening 13 of the food packaging bag 1.

[0025] However, the order in which the four sheet pieces are folded is not particularly limited; it is also possible to fold the sheet piece on the front first, then the sheet piece on the side, and finally the sheet piece on the back, or to fold either the sheet piece on either the back or the front first, then the other sheet piece on either the back or the front, and finally the sheet piece on the side, or to fold the sheet piece on the side first, then the sheet piece on either the back or the front, and finally the other sheet piece on either the back or the front.

[0026] Once the opening 13 is closed, tape 7 is applied to seal the opening 13. Alternatively, the opening 13 may be sealed by applying a label, or by joining predetermined overlapping portions of the folded sheet piece by heat sealing or the like.

[0027] Through the above steps, food package 6 is completed as shown in Figure 6. Food package 6 is maintained in an airtight state by top joint 11, a pair of side joints 12, 12, and the closed portion (bottom portion) of sealed opening 13. This prevents outside air from entering the interior, and the intended quality of packaged sandwich S is maintained.

[0028] Next, a manufacturing method (bag-making process) for the food packaging bag 1 will be described. As shown in Figure 7, the bag-making process includes: i) a first pre-process for preparing a first sheet raw material 2X having a continuous first sheet 2; ii) a second pre-process for preparing a second sheet raw material 3X having a continuous second sheet 3; overlapping the first sheet raw material 2X and the second sheet raw material 3X with their inner surfaces facing each other and transporting them intermittently in this state; iii) a process for forming a top joint 11 (first process); iv) a process for forming a side joint 12 (second process, which may be performed simultaneously with the first process); v) a process for cutting and dividing the side joint 12 along the midline of the side joint 12 to individually separate the food packaging bag 1 (third process); and vi) a process for forming a notch 14 (fourth process).

[0029] Due to their shape, this type of trapezoidal food packaging bags 1 are manufactured so that they are oriented transversely to the conveyance direction of the raw sheet webs 2X, 3X and so that their orientations alternate. That is, food packaging bags 1 having an opening 13 on one side in the width direction (TD) perpendicular to the conveyance direction (MD) of the raw sheet webs 2X, 3X and a header portion 15 on the other side in the width direction, and food packaging bags 1 having an opening 13 on the other side in the width direction and a header portion 15 on one side in the width direction, are manufactured alternately. In Figure 7, the configuration of the former food packaging bag 1 is indicated by the letter "A" after the reference numeral, and the configuration of the latter food packaging bag 1 is indicated by the letter "B" after the reference numeral.

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

[0031] <Area division> At least one of the pair of sheets 2, 3 is partitioned into multiple regions in the longitudinal direction. Representative patterns of this partitioning will be described below. Note that the following description will be given of the case where the first sheet 2 (first sheet raw material 2X) is partitioned into multiple regions. If the second sheet 3 (second sheet raw material 3X) is also partitioned into multiple regions, the description will be the same as for the first sheet 2 (first sheet raw material 2X), and will not be repeated.

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

[0033] The first sheet 2 is made into a single sheet by overlapping three sheets (a middle separate sheet 26 and upper and lower end separate sheets 26, 26) at their edges (overlapped portion 27) and joining the overlapped portion 27 by heat sealing. At the overlapped portion 27, the edge of the end separate sheet 26 is positioned on the outer surface of the edge of the middle separate sheet 26, and the edge of the middle separate sheet 26 and the edge of the end separate sheet 26 are overlapped so that the outer surface of the edge of the middle separate sheet 26 faces the inner surface of the edge of the end separate sheet 26. However, which edge of adjacent sheets is positioned on the outer surface and which edge is positioned on the inner surface is a matter that should be appropriately selected depending on the properties and design of the adjacent sheets (the same applies below).

[0034] Next, a method for manufacturing a sheet material according to area division pattern A will be described. As shown in FIG. 9, two sheet material rolls are rotatably supported: one is a roll of divided sheet material 26X, each of which is made up of a continuous middle divided sheet 26; and the other is a roll of divided sheet material 26X, each of which is made up of a continuous end divided sheet 26. The pair of end divided sheet material rolls 26X, 26X have the same width. The middle divided sheet material roll 26X and the pair of end divided sheet material rolls 26X, 26X are fed from the respective sheet material rolls. The pair of end divided sheet material rolls 26X, 26X are fed so as to sandwich the middle divided sheet material roll 26X therebetween, and the side edges of the middle divided sheet material roll 26X and the side edges of the end divided sheet material roll 26X are overlapped (overlapped portion 27), and the overlapped portion 27 is joined by heat sealing to form a single sheet material roll.

[0035] 10, the method for manufacturing food packaging bags 1 equipped with sheets according to area division pattern A using a sheet stock according to area division pattern A is the same as the method for manufacturing the food packaging bags 1 described above. Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 26 in the middle section 23 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 in the middle section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet stock 26X), and ii) the end separate sheet 26 in the upper section 22 of the first sheet 2 of one food packaging bag 1 and the end separate sheet 26 in the lower section 24 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (end separate sheet stock 26X).

[0036] <Area division pattern B> 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 according to region 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 manufacturing method of the sheet raw material according to area division pattern B is the same as the manufacturing method of the sheet raw material according to area division pattern A. Furthermore, as shown in Fig. 12, the manufacturing method of the food packaging bag 1 using the sheet raw material according to area division pattern B and including the sheet according to area division pattern B is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material according to area division pattern A and including the sheet according to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 26 in the middle section 23 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 in the middle section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X), and ii) the end separate sheet 26 in the upper section 22 of the first sheet 2 of one food packaging bag 1 and the end separate sheet 26 in the lower section 24 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (end separate sheet raw material 26X).

[0038] However, because the opening 13 of the food packaging bag 1 is shifted toward the widthwise center of the sheet raw rolls 2X and 3X (in this example, the widthwise center of the sheet raw rolls 2X and 3X coincides with the widthwise center of the intermediate divided sheet raw roll 26X), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw rolls 2X and 3X. Also, as described above, therefore, in the food packaging bag 1, the height dimension of the lower tier 24 becomes smaller than the height dimension of the upper tier 22.

[0039] In the manufacturing method, with regard to the step (third step) of separating the food packaging bag 1 into individual pieces by cutting and dividing the side joint 12 along the midline of the side joint 12, and the step (fourth step) of forming the cutout 14, the sheet raw material 2X, 3X may first be divided along the midline of the side joint 12, and then, including the fourth step, the outer contour lines may be trimmed to form the shape of the food packaging bag 1, or the food packaging bag 1 may be punched out using a Thomson blade (full-circumference Thomson blade) (the same applies below).

[0040] <Area division pattern C> 13, 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 according to region division pattern A is that the height dimension of the upper section 22 is smaller than the height dimension of the lower section 24.

[0041] The manufacturing method of the sheet raw material relating to area division pattern C is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Furthermore, as shown in Fig. 14, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern C and including the sheet according to area division pattern C is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and including the sheet according to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 26 relating to the middle section 23 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 relating to the middle section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X), and ii) the end separate sheet 26 relating to the upper section 22 of the first sheet 2 of one food packaging bag 1 and the end separate sheet 26 relating to the lower section 24 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (end separate sheet raw material 26X).

[0042] However, as the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw rolls 2X and 3X (in this example, the widthwise center of the sheet raw rolls 2X and 3X coincides with the widthwise center of the intermediate divided sheet raw roll 26X), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw rolls 2X and 3X. Also, as described above, therefore, in the food packaging bag 1, the height dimension of the upper tier portion 22 becomes smaller than the height dimension of the lower tier portion 24.

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

[0044] The manufacturing method of the sheet raw material relating to area division pattern D is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Also, as shown in Fig. 16, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern D and equipped with the sheet relating to area division pattern D is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and equipped with the sheet relating to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the middle divided sheet 26 relating to the middle two-tier section 23 of the first sheet 2 of one food packaging bag 1 and the middle divided sheet 26 relating to the middle two-tier section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle divided sheet raw material 26X), ii) the end divided sheet 26 relating to the upper tier 22 of the first sheet 2 of one food packaging bag 1 and the end divided sheet 26 relating to the lower tier 24 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (end divided sheet raw material 26X), and iii) the middle divided sheet 26 relating to the middle one tier 23 of the first sheet 2 of one food packaging bag 1 and the middle divided sheet 26 relating to the middle three tiers 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle divided sheet raw material 26X).

[0045] However, as the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the middle divided sheet raw material 26X relating to the middle two-tier portion 23), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

[0046] <Area division pattern E> 17, the first sheet 2 is divided into five regions: an upper section 22, a first middle section 23, a second middle section 23, a third middle section 23, and a lower section 24. The difference from the sheet according to region division pattern D is that a divided sheet 26 is attached to a whole sheet 25.

[0047] The manufacturing method of the sheet raw material relating to area division pattern E is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Furthermore, as shown in Fig. 18, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern E and including the sheet relating to area division pattern E is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and including the sheet relating to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 26 relating to the middle one-tiered portion 23 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 relating to the middle three-tiered portion 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X).

[0048] However, since the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the entire sheet raw material 25X), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

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

[0050] The manufacturing method of the sheet raw material according to region division pattern F is the same as the manufacturing method of the sheet raw material according to region division pattern A. Furthermore, as shown in Fig. 20, the manufacturing method of the food packaging bag 1 using the sheet raw material according to region division pattern F and including the sheet according to region division pattern F is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material according to region division pattern A and including the sheet according to region division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 26 relating to the first middle section 23 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 relating to the first middle section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X), and ii) the end separate sheet 26 relating to the top section 22 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 relating to the second middle section 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X).

[0051] However, as the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the middle divided sheet raw material 26X relating to the middle tier portion 23), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

[0052] <Area division pattern G> 21, the first sheet 2 is divided into four regions: an upper section 22, a first middle section 23, a second middle section 23, and a lower section 24. The difference from the sheet according to region division pattern F is that a divided sheet 26 is attached to a whole sheet 25.

[0053] The manufacturing method of the sheet raw material relating to area division pattern G is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Furthermore, as shown in Fig. 22, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern G and including the sheet relating to area division pattern G is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and including the sheet relating to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the end separate sheet 26 relating to the upper section 22 of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 26 relating to the middle two sections 23 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 26X).

[0054] However, since the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the entire sheet raw material 25X), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

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

[0056] The manufacturing method of the sheet raw material relating to area division pattern H is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Furthermore, as shown in Fig. 24, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern H and including the sheet relating to area division pattern H is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and including the sheet relating to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the divided sheet 26 at the end of the upper portion 22 of the first sheet 2 of one food packaging bag 1 and the divided sheet 26 at the end of the upper portion 22 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle divided sheet raw material 26X).

[0057] However, as the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the intermediate divided sheet raw material 26X relating to the upper portion 22), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

[0058] <Area division pattern I> 25, the first sheet 2 is divided into two regions: an upper portion 22 and a lower portion 24. The difference from the sheet according to region division pattern H is that a separate sheet 26 is attached to a whole sheet 25.

[0059] The manufacturing method of the sheet raw material relating to area division pattern I is the same as the manufacturing method of the sheet raw material relating to area division pattern A. Furthermore, as shown in Fig. 26, the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern I and including the sheet relating to area division pattern I is the same as the manufacturing method of the food packaging bag 1 using the sheet raw material relating to area division pattern A and including the sheet relating to area division pattern A. Therefore, in adjacent food packaging bags 1, 1, i) the divided sheet 26 at the end of the upper portion 22 of the first sheet 2 of one food packaging bag 1 and the divided sheet 26 at the end of the upper portion 22 of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle divided sheet raw material 26X).

[0060] However, since the header portion 15 of the food packaging bag 1 shifts toward the widthwise center of the sheet raw materials 2X and 3X (in this example, the widthwise center of the sheet raw materials 2X and 3X coincides with the widthwise center of the entire sheet raw material 25X), the height dimension of the food packaging bag 1 becomes smaller than the width of the sheet raw materials 2X and 3X.

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

[0062] <Plastic sheet> The sheet is a heat-sealable plastic sheet (film) made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or the like. For example, the sheet is a biaxially oriented polypropylene (OPP) sheet (film) or a non-oriented polypropylene (CPP) sheet (film). Alternatively, the sheet is a laminated sheet (film). One type of laminated sheet (film) is formed by laminating, from the outer surface side, a base layer, an adhesive layer, and a resin layer. Resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used for the base layer. Dry lamination, extrusion lamination, and the like are used for the adhesive layer. Resins such as polypropylene (PP) and polyethylene (PE) are used for the resin layer. The term "polypropylene sheet (film)" not only refers to 100% pure polypropylene sheets (films), but also includes sheets (films) that contain polypropylene as the main component and other components (e.g., other resin components such as polyethylene). It should be noted that the term "sheet" is not defined by thickness, but is a concept that includes film (the same applies hereinafter).

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

[0064] <Cellophane sheet> The sheet is typically cellophane, moisture-proof cellophane, cellophane-based, or cellophane-like (collectively referred to as "cellophane"), or a sheet (film) primarily made of these (collectively referred to as "cellophane sheet" (film)). The sheet may have heat-sealing properties on the inner surface, either entirely or partially where necessary. For example, the sheet may be a laminated sheet (film) with cellophane as the outer layer and a plastic sheet (film) as the inner layer. One form of laminated sheet (film) is formed by laminating, from the outer surface side, a base layer, an adhesive layer, and a resin layer. Cellophane is used as the base layer. Dry lamination, extrusion lamination, etc. are used as the adhesive layer. Resins such as polypropylene (PP) and polyethylene (PE) are used as the resin layer. As an example, the base layer is ordinary cellophane or moisture-proof cellophane, the adhesive layer is dry laminate, 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, the opening strip 33 is picked up and pulled down. The opening strip 33 is joined to one end of the opening strip 34. Therefore, when the opening strip 33 is picked up and pulled down, the opening strip 34 is pulled, and the second sheet 3 is broken along both side edges of the opening strip 34, forming a tearable open portion in the second sheet 3. The sandwich S can be taken out from this tearable open portion.

[0069] When the second sheet 3 is divided into multiple regions, as shown in FIG. 28, the tearing strip 34 must also tear the overlapping portion 27 of the sheets 26, 26. In order to smoothly tear this overlapping portion 27, an easily tearable portion is formed on the edge of the two sheets 26, 26 at the overlapping portion 27 that faces the tear piece 33. The easily tearable portion in FIG. 28(a) is a cut line 28 formed on both sides of the opening strip 34 from the edge of the edge to a predetermined length along 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 easily tearable portion in FIG. 28(b) is an easily tearable processed portion 29 consisting of a group of fine scratches or the like.

[0070] <Opening method B> The opening means B includes a tearing portion that is a tearing line or an opening that can form an opening, and an outer sheet that covers the tearing portion from the outer surface side of the sheet and is joined to the sheet, and has a tab. Examples of the opening means B are described below.

[0071] <Opening method B-1> As shown in Figure 29(a), a tear line 35 is formed as a tear portion on the second sheet 3 of the bag body 10. The tear line 35 is provided in a wide band-shaped region in the widthwise center of the second sheet 3, from near the top joint 11 toward the other end of the second sheet 3. Taking into consideration the ease of removing the contents (sandwich), the width of the tear portion is selected to be an appropriate value of 10 mm or more, 15 mm or more, 30 mm or more, or 40 mm or more depending on the width of the contents. However, as will be explained in opening means B-2 below, if a left-right tear structure is provided, the width of the tear portion may be smaller than these values. In addition, from the viewpoint of ensuring a joining margin between the outer sheet 5 and the second sheet 3 described later, the width of the opening portion is 90% or less, or 85% or less, or 80% or less of the width of the top joint 11 (the length of the inner edge of the top joint 11, with its intersections with the inner edges of the side joints 12 as its two end points; this corresponds to the width of the storage portion of the food packaging body 6 or the width of the sandwich 6).

[0072] The tearing portion is composed of a first tearing line 35a and a second tearing line 35b. The first tearing line 35a is formed near the top joint portion 11 and is a cut line that gradually widens toward the other end of the second sheet 3. In this example, the first tearing line 35a is a mountain-shaped (inverted V-shaped) cut line that overlaps at one end and slopes so that it gradually widens. The second tearing lines 35b are a pair of parallel, vertical, linear cut lines that extend from both ends of the first tearing line 35a toward the other end of the second sheet 3.

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

[0074] An outer sheet 5 is provided on the outer surface of the second sheet 3. The outer sheet 5 covers and seals the tearing portion (the tearing line 35) from the outer surface side of the second sheet 3, thereby functioning as a sealant to prevent outside air, foreign matter, etc. from entering the interior through the tearing line 35. The outer sheet 5 is provided in a wide band-shaped region in the widthwise center of the second sheet 3, from near the top joint 11 toward the other end of the second sheet 3. From the viewpoint of ensuring a joining margin to the second sheet 3, the width of the outer sheet 5 is 105% or more, 110% or more, or 115% or more of the width of the tearing portion.

[0075] The outer sheet 5 comprises a main body portion 50 and a tab portion 51. The main body portion 50 has a shape large enough to contain the tear line 35, and is joined to the outer surface of the second sheet 3. The tab portion 51 protrudes from the main body portion 50 toward one end 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 tab portion 51 are each rectangular.

[0076] The outer sheet 5 is a plastic sheet cut to 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 tear line 35. In this example, the outer sheet 5 is a polyethylene terephthalate (PET) sheet. As an example, the outer sheet 5 is joined to the outer surface of the second sheet 3 by heat sealing or self-adhesive after a coating agent is applied to the entire inner surface of the main body portion 50 (the surface facing the second sheet 3).

[0077] The outer sheet 5 also functions as a tear-open sheet by being joined to the release strip 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 the outer sheet 5 can be peeled from the outer region of the release strip 36 (opening line 35) of the second sheet 3, but is difficult to peel from the release strip 36 (inner region of the opening line 35). In this example, the outer sheet 5 is joined to the release strip 36 in a difficult-to-peel manner 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, the user pinches and pulls the tab 51, as shown in Figure 30. The main body 50 of the outer sheet 5 is joined to the free strip 36 of the second sheet 3. Therefore, when the user pinches and pulls the tab 51 of the outer sheet 5, the free strip 36 is pulled down, forming an opening 38 in the second sheet 3, from which the sandwich can be removed.

[0079] Moreover, the tearing portion (tear line 35) is formed in a vertically long, wide band-like region over a wide area of ​​the back portion of the food package 6 (excluding the header portion 15; the same applies below). This forms a large opening 38, making it easy to remove the sandwich. With this tearing portion, the upper end of the outer sheet 5 of the food package 6 is located close to the top joint portion 11, and the lower end of the outer sheet 5 is located close to the bottom portion of the food package 6. In other words, the outer sheet 5 is positioned over almost the entire height of the back portion of the food package 6, and the tab portion 51 is located near the top joint 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 Figure 32(a), the tearing portion is composed of a first tearing line 35d and a second tearing line 35e. The first tearing line 35d is formed near the top joint 11 and is a horizontal, straight cut line along the top joint 11. The second tearing lines 35e are a pair of vertical, parallel, straight cut lines extending from both ends of the first tearing line 35a toward the other end of the second sheet 3. The tearing portion and outer sheet 5 have the same size as the tearing portion and outer sheet 5 associated with tearing means B-1.

[0083] As shown in FIG. 32(b), the tearing line 35 is a full cut line that penetrates the front and back of the second sheet 3 along its entire length. Alternatively, as shown in FIG. 32(c), the tearing line 35 is a cut line that has a connecting portion 37, which connects the inner region (free strip 36) and outer region of the tearing line 35 of the second sheet 3 with a narrow width of about 0.1 mm to 3 mm, at one left and one right location on the top joint 11 side (in the illustrated example, the intersection of the first tearing line 35d and the second tearing line 35e). Alternatively, as shown in FIG. 32(d), the tearing line 35 is a cut line that has connecting portions 37 at appropriate wider intervals (in the illustrated example, one left and one right location on the top joint 11 side and one location on each second tearing line 35e). Alternatively, as shown in FIG. 32(e), the tearing line 35 is a perforated or dashed cut line.

[0084] Similarly to the opening means B-2, the opening line 35 may also have a pair of left and right third opening lines on the top joint portion 11 side. For example, the third opening lines are straight or curved cut lines extending obliquely upward from a predetermined position on 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 from a predetermined position on the second opening line 35e along the width direction of the second sheet 3 outward in the width direction of the second sheet 3. In the latter case, for example, the third opening line is a straight cut line extending from a bending point of the opening line 35 (the intersection of the first opening line 35d and the second opening line 35e) in the extension direction of the first opening line 35d.

[0085] <Opening method B-4> As shown in Figure 33(a), the tearing portion is composed of a first tearing line 35f and a second tearing line 35g. The first tearing line 35f is formed near the top joint 11 and on the other end side of the second sheet 3, and is a pair of parallel, straight cut lines that are horizontal along the top joint 11. The second tearing line 35g is a vertical, straight cut line that connects the centers of the pair of first tearing lines 35f, 35f. The tearing portion and outer sheet 5 have the same size as the tearing portion and outer sheet 5 related to the tearing means B-1 to B-3.

[0086] When eating the sandwich, as shown in FIG. 33(b), after peeling the outer sheet 5 from the second sheet 3 (first-stage opening operation), the second-stage opening operation involves opening the second sheet 3 on either side of the second tear line 35g from the left and right free pieces 39 formed between the pair of first tear lines 35f, 35f. 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 first tear line 35f, because the first tear line 35f provides a tear direction in the width direction of the second sheet 3. This allows the opening 38 to be opened widely, exposing the entire sandwich. Note that the second-stage opening may involve opening only one side, or only the other side. Of course, both sides may also be opened like a double door.

[0087] <Opening method B-5> As shown in Figure 34, the difference between opening means B-5 and opening means B-1 to B-4 is in the opening portion, specifically, in that the opening 38 is not formed in the second sheet 3 by opening the free strip 36 or the left and right free strips 39 through the opening operation, but rather the opening 38 is formed from the beginning without the free strip 36 or the left and right free strips 39.

[0088] The tearing portion (opening 38) is formed to a size corresponding to the rear portion of the food package 6, taking into consideration ease of removal of the sandwich. Specifically, the tearing portion is formed in an area where each side of the rear portion of the food package 6 is offset inward, leaving a width for joining with the outer sheet 5. As a result, the tearing portion and outer sheet 5 are larger than the tearing portions and outer sheet 5 associated with opening methods B-1 to B-4. Furthermore, because the outer sheet 5 is larger, the upper end of the opening 38 is located close to the apex joint 11, and the main body portion 50 of the outer sheet 5 is joined at a location close to the apex joint 11. As a result, the tab portion 51 of the outer sheet 5 overlaps the apex joint 11 and advances into the header portion 15.

[0089] The coating agent applied to the outer sheet 5 is food-safe, but it is best to avoid direct contact with the sandwich. Therefore, in this example, no coating agent is applied to the area of ​​the inner surface of the outer sheet 5 that corresponds to the opening 38 (or a slightly larger area).

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

[0091] <Opening method B-6> In opening methods B-1 to B-5, the outer sheet 5 is formed to a size that fits within the rear portion of the food package 6. However, as shown in Figure 35(a), the outer sheet 5 may also be sized (long enough) to extend into the header portion 15.

[0092] <Opening method B-7> In addition, in opening methods B-1 to B-6, the outer sheet 5 is joined to the second sheet 3 over the entire surface of the main body 50 (solid seal). However, as shown in Figure 35(b), the outer sheet 5 may be joined to the second sheet 3 by a frame-shaped outer joining portion 53 that surrounds the tear line 35. In the illustrated example, the outer joining portion 53 is strip-shaped with a predetermined width and is formed inward from the outer periphery of the outer sheet 5 at a predetermined width. As a result, the outer periphery of the outer sheet 5 is an unjoined portion.

[0093] <Opening method B-8> In addition, in opening methods 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 has heat-welding properties on its outer surface as well. However, in opening methods B-1 to B-7, the outer sheet may have adhesive properties on its inner surface and be peelably adhesive or bonded to the second sheet. This is effective when the second sheet 3 does not have heat-welding properties on its outer surface.

[0094] <Opening method C> As shown in Figure 36, opening method C involves holding and opening each sheet piece of the header portion 15 (the tip portion 21 of the first sheet 2 and the tip portion 31 of the second sheet 3) and peeling off the side joint portion 12.

[0095] <Combination> As described above, the food packaging bag 1 is configured by appropriately selecting from a plurality of area division patterns, a plurality of sheet materials, and a plurality of opening means. Examples of combination patterns include the following:

[0096] [Table 1]

[0097] Many of these patterns include a pattern in which the lower end of the second sheet 3 (the portion on the opening 13 side) is a plastic sheet. As mentioned above, the lower end of the second sheet 3 is the portion that is folded first when packaging the sandwich S (see FIG. 4(c)). If the lower end of this second sheet 3 is a plastic sheet that is softer and / or less prone to curling than a paper sheet or cellophane sheet, it can be folded neatly, and ultimately the opening 13 can be closed reliably and neatly.

[0098] As described above, in the food packaging bag 1 according to each of the above embodiments, a paper sheet or cellophane sheet is used for part of the first sheet 2 and / or the second sheet 3. Paper sheets and cellophane sheets are more susceptible to creases than plastic sheets. As a result, the sheets 2 and 3 are folded sharply at each side of the food package 6, giving the food package 6 a sharp appearance. Therefore, the food packaging bag 1 according to each of the above embodiments has the effect of providing excellent appearance, stability, and therefore excellent self-standing ability when made into a food package 6.

[0099] Furthermore, paper sheets and cellophane sheets are more rigid than plastic sheets. This provides stiffness to sheets 2 and 3, which has the effect of improving the self-standing ability of food packaging 6. The stiffness of sheets 2 and 3 also improves the stiffness of food packaging 6. Therefore, food packaging bag 1 according to each of the above embodiments is highly effective in preventing sandwich S from losing its shape.

[0100] Furthermore, according to the food packaging bag 1 of each of the above-described embodiments, the amount of plastic used can be reduced by using a paper sheet or cellophane sheet. In recent years, waste plastic has become a global environmental problem, and the food packaging bag 1 of each of the above-described embodiments can be an effective solution to this environmental problem.

[0101] Furthermore, in the food packaging bag 1 according to each of the above embodiments, the side joint portion 12 is formed in a strip shape with a predetermined width along the side edge of the bag body 10 and the side edge of the header portion 15 (and, in embodiments according to area division pattern A, etc., is bent at the intersection with the top joint portion 11). As a result, in the state where the food packaging bag 1 is formed into a food package 6, the side joint portion 12 is in a backward position as shown in FIG. 6. As a result, the header portion 15 is in an upright position because pillars are formed on both sides. Moreover, the header portion 15 is in a flat position extending straight from the front portion of the bag body 10. Therefore, the food packaging bag 1 according to each of the above embodiments can improve the appearance in the state where the food packaging bag 6 is formed, and can make the display on the header portion 15 easier to see when it is displayed in a store such as a convenience store.

[0102] The food packaging bag according to the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0103] In the above embodiment, the paper sheet and the cellophane sheet have heat-sealing properties on the inner surface. However, the present invention is not limited to this. The paper sheet and the cellophane sheet may have heat-sealing properties on the outer surface as well as on the inner surface.

[0104] Furthermore, the header portion is not essential for the food packaging bag. For example, the food packaging bag may have no header portion and may be made up of only the bag body.

[0105] Furthermore, in the present invention, terms that specify a shape, part, or state, such as "trapezoid," "triangular," "rectangular," "rectangular," "straight line," "center," "end," "side," "even," "coincident," "parallel," and "orthogonal," include not only the term itself, but also the concept of "approximately" which means something close to or similar to it.

[0106] In the above embodiment, the food is a sandwich, but the type of food to be packaged is not particularly limited, and may be Western confectionery such as cake, Japanese confectionery such as castella, bread, or cooked rice foods such as rice balls, as long as the food can be placed in the food packaging bag. [Explanation of symbols]

[0107] 1...food packaging bag, 10...bag body, 11...top joint, 12...side joint, 13...opening, 14...notch, 15...header, 2...first sheet, 2X...first sheet raw material, 20...body, 21...tip, 22...upper portion, 23...middle portion, 24...lower portion, 25...whole sheet, 25X...whole sheet raw material, 26...divided sheet, 26X...divided sheet raw material, 27...overlap portion, 28...score line, 29...easy-to-tear portion, 3...second sheet, 3X...second sheet raw material, 30...body, 31 ...tip portion, 32...slit line, 33...opening strip, 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, 37...connecting portion, 38...opening, 39...left and right free strips, 4...inner sheet, 40...joint portion, 5...outer sheet, 50...main body portion, 51...handle portion, 52...inner joint portion, 53...outer joint portion, 6...food package, 7...tape, S...sandwich

Claims

1. the sheet is partitioned into a plurality of regions in a first direction, and a single sheet is formed by using a plurality of divided sheets such that two adjacent regions are different sheets; On the premise that the sheet has a paper sheet or a cellophane sheet in part, a separate sheet of either a plastic sheet, a paper sheet or a cellophane sheet is selectively used in each region; An opening strip is joined to the inner surface of the sheet from one end side to the other end side in the first direction, The dividing sheet in the region through which the tearing strip passes has an easily breakable portion on both sides of the tearing strip at an edge portion facing one end side in the first direction. Food packaging sheet.

2. The sheet is formed by overlapping the edges of two adjacent separate sheets so that the outer surface of one separate sheet faces the inner surface of the other separate sheet, and joining the overlapping portions to form a single sheet; The easily breakable portion is formed on one of the two edges of the overlapping portion that faces one end side in the first direction. The food packaging sheet according to claim 1.

3. The easily breakable portion is a cut line formed along the opening strip from the edge of the edge facing one end side in the first direction of the two edge portions of the overlapping portion, but not reaching the edge of the other edge portion. The food packaging sheet according to claim 2.

4. One of the separate sheets located at one end side in the first direction has a tear strip formed by forming a cut line, One end of the tear strip is joined to the inner surface of the tear strip. The food packaging sheet according to any one of claims 1 to 3.

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