Food packaging bags

Abstract

To provide a food packaging bag capable of obtaining appropriate stability and self-standing when having become a food package.SOLUTION: In a food packaging bag according to the present invention, sheets 2, 3 in a pair each having a shape where the other end side is wider than one end side in a first direction, are overlapped with each other, and each comprise a bag body 10 with three sides sealed with a top portion connection part 11 on the one end side and a side portion connection parts 12, 12, and with the other end side caused to become an opening 13. One sheet 2 of the pair of sheets is partitioned into an upper stage part 22, a middle stage part 23, and a lower stage part 24. The other sheet 3 of the pair of sheets comprises; an opening part 35; and an outer sheet 5 covering an opening part 35 from an outer face side of the sheet 3 and joined to the sheet 3, the outer sheet 5 having a knob part 51. The upper stage part 22 and the lower stage part 24 of the one sheet 2, and the other sheet 3 are made from paper sheets, respectively. The side portion joining part 12 is formed into a belt shape with a prescribed width along a side edge of the bag body 10.SELECTED DRAWING: Figure 9

Description

[Technical field]

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

[0002] There are foods such as sandwiches that have a triangular (usually 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 18 and 19(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 formed by overlapping a pair of sheets 2', 3' each having a shape in which one end is wider than the other end, and is sealed on three sides by a top joint portion 11' at one end and side joint portions 12', 12' at both side edges, with the other end forming 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' to each other at appropriate points and integrating them.

[0004] In the second sheet 3' in the header portion 15', for example, an inverted U-shaped cut line 32' is formed, and a tear strip 33' having the cut line 32' as an outline is formed. On the inner surface of the second sheet 3', a tear strip 5' such as a cutting tape is joined from the tear strip 33' to the other end side of the second sheet 3'.

[0005] When eating food packaged in the food packaging bag 1', the opening strip 33' is picked up and pulled down in the food package 6' as shown in Fig. 19(b), whereby the opening strip 5' is pulled to form a tearable open section in the second sheet 3', and the food can be taken out from this tearable open section. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-171326 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the sheet used in the conventional food packaging bag is a plastic sheet. Since the plastic sheet has low plasticity, it tends to return to its original flat state even when folded. Therefore, the sheet does not bend sharply at each side of the food package, and tends to become rounded. Therefore, the conventional food packaging bag has a problem that the stability and thus the self-supporting ability are poor when the food package is made.

[0008] The present invention has been made in consideration of the above circumstances, and has an object to provide a food packaging bag that can provide suitable stability and self-supporting ability when used as a food package. [Means for solving the problem]

[0009] 1. The food packaging bag according to the present invention is a bag body including a pair of overlapping sheets each having a shape in which one end side is wider than one end side in a first direction, the bag body being sealed on three sides by a top joint part at one end side and side joint parts at both sides, and the other end side being an opening, One sheet is divided into an upper section, a middle section, and a lower section. It is made by joining the ends of multiple sheets together to form a single sheet. , the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; The upper part of one of the seats Sheet , Lower part Sheet and other To , paper sheet and , The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body. 、 The opening portion is composed of a first opening line consisting of a cut line having a shape that gradually becomes wider toward the other end side of the other sheet in the vicinity of the top joint portion, and a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and the opening line has a connecting portion that connects the inner region and the outer region of the opening line of the other sheet with a narrow width at the left and right locations on the top joint portion side. It is a food packaging bag. The food packaging bag according to the second aspect of the present invention is a bag body including a pair of overlapping sheets each having a shape in which one end side is wider than one end side in a first direction, the bag body being sealed on three sides by a top joint part at one end side and side joint parts at both sides, and the other end side being an opening, One sheet is a single sheet made by joining ends of a plurality of sheets together so that the sheet is divided into an upper portion, a middle portion, and a lower portion, the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; the upper sheet, the lower sheet and the other sheet of the one sheet are paper sheets; The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body, The opening portion is composed of a first opening line consisting of a cut line having a shape that gradually becomes wider toward the other end side of the other sheet in the vicinity of the top joint portion, a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and a third opening line consisting of a pair of cut lines extending diagonally upward to the left and right or outward in the width direction to the left and right from a predetermined portion of the first opening line, and the opening line has a connecting portion at the left and right locations on the top joint portion side that connects the inner region and the outer region of the opening line of the other sheet with a narrow width. It is a food packaging bag. The food packaging bag according to the third aspect of the present invention is a bag body including a pair of overlapping sheets each having a shape in which one end side is wider than one end side in a first direction, the bag body being sealed on three sides by a top joint part at one end side and side joint parts at both sides, and the other end side being an opening, One sheet is a single sheet made by joining ends of a plurality of sheets together so that the sheet is divided into an upper portion, a middle portion, and a lower portion, the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; the upper sheet, the lower sheet and the other sheet of the one sheet are paper sheets; The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body, The opening portion is composed of a first opening line consisting of a cut line along the top joint portion in the vicinity of the top joint portion, and a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and the opening line has a connecting portion at the left and right parts of the top joint portion that connects the inner region and the outer region of the opening line of the other sheet with a narrow width. It is a food packaging bag.

[0011] Here, these The food packaging bag according to the present invention one As an aspect, A header portion is provided which is formed of a protruding piece of each sheet protruding from the top joint portion, The side joint portion is formed in a strip shape with a predetermined width along the side edge of the bag body and the side edge of the header portion, The upper section is divided into an upper portion of the bag body and a header section, The middle section is defined in the middle of the bag body and has a trapezoidal shape, The lower section is defined at the bottom of the bag body, The bag has a trapezoidal portion continuing to the middle section and a portion narrowed by cutouts formed at both corners on the opening side of the bag body. The above configuration can be adopted. Effect of the Invention

[0013] As described above, the food packaging bag according to the present invention can obtain suitable stability and self-supporting ability when made into a food package by using a paper sheet as part of the sheet. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an exploded perspective view of a food packaging bag according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of the food packaging bag. [Diagram 3] FIG. 3 is a rear view of the food packaging bag. [Figure 4] Fig. 4(a) is a front view of the first sheet of the food packaging bag, and Fig. 4(b) is a cross-sectional view taken along line AA in Fig. 4(a). [Diagram 5] Fig. 5(a) is a front view of the second sheet of the food packaging bag, and Figs. 5(b) to 5(e) are front views of examples of tear lines provided on the second sheet. [Figure 6] 6(a) to (c) are explanatory diagrams showing the process of packaging food using the food packaging bag. [Figure 7] 7(a) to (d) are explanatory diagrams continuing from FIG. [Figure 8] FIG. 8 is a perspective view of a food package packaged in the food packaging bag as viewed from the front side. [Figure 9] Figure 9(a) is a perspective view of the food package as viewed from the rear side, and Figure 9(b) is a perspective view of the food package being opened. [Figure 10] FIG. 10 is an explanatory diagram of the manufacturing process of the food packaging bag, specifically, an explanatory diagram of the manufacturing process of the first raw sheet. [Figure 11] FIG. 11 is an explanatory diagram of the manufacturing process of the food packaging bag, specifically, an explanatory diagram of the manufacturing process of the second raw sheet. [Figure 12] FIG. 12 is an explanatory diagram of the manufacturing process of the food packaging bag, illustrating each step from overlapping the first sheet material roll and the second sheet material roll to the final completion of the food packaging bag. [Figure 13] Fig. 13(a) is a front view of a tear line formed on a second sheet of a food packaging bag according to a modified example of the first embodiment, and Fig. 13(b) is a perspective view showing a state in which a food package packaged in the food packaging bag is opened. [Figure 14] Fig. 14(a) is a front view of the second sheet of the food packaging bag according to the second embodiment of the present invention, and Figs. 14(b) to 14(e) are front views of examples of tear lines provided on the second sheet. [Figure 15] Fig. 15(a) is a front view of the second sheet of a food packaging bag according to a third embodiment of the present invention, and Fig. 15(b) is a perspective view showing a state in which a food package packaged in the food packaging bag is opened. [Figure 16] Fig. 16(a) is a front view of the second sheet of a food packaging bag according to a fourth embodiment of the present invention, and Fig. 16(b) is a perspective view showing a state in which a food package packaged in the food packaging bag is opened. [Figure 17] Fig. 17(a) is a front view of a second sheet of a packaging bag for food according to another embodiment, and Fig. 17(b) is a front view of the second sheet of a packaging bag for food according to yet another embodiment. [Figure 18] FIG. 18 is a rear view of a conventional food packaging bag. [Figure 19] Fig. 19(a) is a perspective view of a food package wrapped in the food packaging bag as viewed from the back side, and Fig. 19(b) is a perspective view of the food package being opened. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] First Embodiment Hereinafter, a food packaging bag used for packaging sandwiches will be described as a first embodiment of the food packaging bag according to the present invention with reference to Figs. 1 to 12.

[0016] As shown in Figs. 1 to 3, the food packaging bag 1 according to this embodiment 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 called the front sheet, and the second sheet 3 is also called the back sheet. The pair of sheets have a shape in which one side in a direction perpendicular to each other is longer than the other, and 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 joint portion 11 at one end side and side joint portions 12, 12 at both sides, and the other end side is an opening portion 13. The header portion 15 is formed by joining the protruding pieces of the sheets 2, 3 protruding from the top joint portion 11 to each other at appropriate locations to be integrated. In the following, the one of the above 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 above directions (the left-right direction in Figures 2 and 3) will be referred to as the "width direction" or "second direction".

[0017] The first sheet 2 includes a body portion 20 and a tip portion 21 (the above-mentioned protruding piece). The body portion 20 has a shape that gradually becomes wider from one end side to the other end side. The tip portion 21 has a narrow shape that extends from one end of the body portion 20.

[0018] As shown in Fig. 4, the first sheet 2 is divided into an upper stage portion 22, a middle stage portion 23, and a lower stage portion 24. The upper stage portion 22 is defined in the upper portion and tip portion 21 of the body portion 20. The lower stage portion 24 is defined in the lower portion of the body portion 20. The middle stage portion 23 is defined between the upper stage portion 22 and the lower stage portion 24, i.e., in the middle portion of the body portion 20. The upper stage portion 22 and the lower stage portion 24 have the same height dimension.

[0019] The first sheet 2 is made into a single sheet by overlapping three sheets (an intermediate sheet 25 and upper and lower end sheets 26, 26) at their edges (an overlapping portion 27) and joining the overlapping portion 27 by heat sealing. In the overlapping portion 27, the edge of the end sheet 26 is placed on the outer surface side of the edge of the intermediate sheet 25, and the edge of the intermediate sheet 25 and the edge of the end sheet 26 are overlapped so that the outer surface of the edge of the intermediate sheet 25 and the inner surface of the edge of the end sheet 26 face each other.

[0020] The intermediate sheet 25 is a plastic sheet (plastic film) having thermal adhesiveness, such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET). In this embodiment, the intermediate sheet 25 is a biaxially oriented polypropylene (OPP) sheet (film). Note that the polypropylene sheet (film) is a concept that includes not only a 100% pure polypropylene sheet (film), but also a sheet (film) containing polypropylene as the main component and other components (e.g., other resin components such as polyethylene) (the same applies below).

[0021] The end sheet 26 is a sheet (film) of paper, Japanese paper, paper-like material, or paper-like material (hereinafter, these are collectively referred to as "paper") having thermal adhesiveness on the inner side. In this embodiment, the end sheet 26 is a laminated sheet (film) in which a biaxially oriented polypropylene (OPP) sheet (film) is laminated to paper. The paper is paper containing bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET).

[0022] The upper stage portion 22 corresponds to the upper end sheet 26. The middle stage portion 23 corresponds to the intermediate sheet 25 excluding the upper and lower overlapping portions 27, 27. The lower stage portion 24 corresponds to the lower end sheet 26. As a result, in the first sheet 2, the upper stage portion 22 and the lower stage portion 24 are opaque (or translucent) portions, and the middle stage portion 23 is a transparent portion through which the inside can be seen.

[0023] 1 to 3, the second sheet 3 is a paper sheet (film) like the end sheet 26 of the first sheet 2. In this embodiment, the second sheet 3 is a laminated sheet (film) in which a biaxially oriented polypropylene (OPP) sheet (film) is laminated onto paper.

[0024] The second sheet 3 includes a body portion 30 and a tip portion 31 (the above-mentioned protruding piece). The body portion 30 has a shape that gradually becomes wider from one end side to the other end side. The tip portion 31 has a narrow shape that extends from one end of the body portion 30.

[0025] In this embodiment, the body portions 20, 30 are trapezoidal, and the tip portions 21, 31 are rectangular. Therefore, one end of the body portions 20, 30 (and the other end of the tip portions 21, 31 that coincides with it) 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. Both side edges of the tip portions 21, 31 are linear and parallel 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 narrower by the amount of the cutout portions 14.

[0026] The top joint 11 is formed by heat sealing the first and second sheets 2, 3 along one end of the body portions 20, 30. In this embodiment, the top joint 11 is a strip-shaped seal having a predetermined width, formed by welding using a heat seal bar.

[0027] The side joint 12 is formed by heat sealing the first and second sheets 2, 3 along the side edges (oblique sides) of the body 20, 30 and the side edges (vertical sides) of the tip portions 21, 31. In this embodiment, the side joint 12 is a strip seal having a predetermined width formed by welding using a heat seal bar. The width of the side joint 12 is smaller than the width of the top joint 11. Specifically, the side joint 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. The side joint 12 is a strip seal formed along the side edges (oblique sides) of the body 20, 30 and the side edges (vertical sides) of the tip portions 21, 31. Therefore, the side joint 12 becomes a strip seal in a bent shape at an intermediate point, i.e., at the intersection with the top joint 11.

[0028] The interior of the bag body 10 constructed in this manner serves as a food storage section. 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 by a point seal or the like (joint 40), and one end is a free end. As a result, even if the food moves within the storage section, the inner sheet 4 adheres closely to the surface of the food and follows the movement. Therefore, the first sheet 2 does not become dirty, and its appearance is not impaired.

[0029] The second sheet 3 in the bag body 10 is formed with a tear line 35 as a tear portion. The tear line 35 is provided in a wide band-shaped region from the vicinity of the top joint 11 to the other end of the second sheet 3 in the width direction center of the second sheet 3. Considering the ease of taking out 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 size of the contents. However, as described in the modified example 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 of the outer sheet 5 to the second sheet 3 described later, the width of the tear portion is 90% or less, 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 the intersection points with the inner edges of the side joints 12 as both end points, which corresponds to the width of the storage portion of the food package 7 or the width of the sandwich 6 described later).

[0030] As shown in FIG. 5(a), the opening portion is composed of a first opening line 35a and a second opening line 35b. The first opening line 35a is a cut line formed near the top joint portion 11 and having a shape that gradually becomes wider toward the other end side of the second sheet 3. In this embodiment, the first opening line 35a is a mountain-shaped (inverted V-shaped) cut line that is inclined so that one end overlaps and gradually becomes wider. The second opening line 35b is a pair of parallel straight cut lines that are vertical and extend from both ends of the first opening line 35a toward the other end side of the second sheet 3.

[0031] As shown in FIG. 5(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. 5(c), the opening line 35 is a cut line having a connecting portion 37 connecting the inner region (free strip 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 left and right location on the top joint 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. 5(d), the opening line 35 is a cut line having the connecting portion 37 at a wide appropriate interval (in the illustrated example, one left and right location on the top joint 11 side and one location on each second opening line 35b). Alternatively, as shown in FIG. 5(e), the opening line 35 is a perforated or dashed cut line.

[0032] An outer sheet 5 is provided on the outer surface of the second sheet 3. The outer sheet 5 covers and seals the opening portion (opening line 35) from the outer surface side of the second sheet 3, thereby functioning as a sealant for preventing outside air, foreign matter, etc. from entering the inside through the opening line 35. The outer sheet 5 is provided in a wide band-shaped region from the vicinity of the top joint portion 11 toward the other end side of the second sheet 3 in the width direction center 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 opening portion.

[0033] The outer sheet 5 includes a main body portion 50 and a gripping 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 gripping 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 embodiment, the outer sheet 5, the main body portion 50, and the gripping portion 51 are each rectangular in shape.

[0034] The outer sheet 5 is a plastic sheet (plastic film) having thermal adhesion such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc., cut into a predetermined shape, similar to the intermediate sheet 25 of the first sheet 2. Alternatively, the outer sheet 5 may be a paper sheet (film) having thermal adhesion on the inner side, similar to the end sheet 26 of the first sheet 2 and the second sheet 3. The main body 50 is joined to the outer surface of the second sheet 3 so as to cover the tear line 35. In this embodiment, 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 (the surface facing the second sheet 3) of the main body 50.

[0035] The outer sheet 5 also functions as a tear-open sheet by being joined to the free 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 off from the outer region of the free strip 36 (the tear line 35) of the second sheet 3, but is difficult to peel off from the free strip 36 (the inner region of the tear line 35). In this embodiment, the outer sheet 5 is joined to the free strip 36 by one or more inner joints 52 formed in a predetermined partial region of the inner region of the tear line 35 so as to be difficult to peel off.

[0036] The food packaging bag 1 according to this embodiment has the above-mentioned configuration, and next, a method for packaging food using this food packaging bag 1 will be described with reference to Figures 6 and 7. Note that Figures 6 and 7 do not show the three-tiered structure of the first sheet 2 or the width of the side joint portion 12.

[0037] 6(a), the opening 13 is opened by blowing air at a predetermined pressure into the bag body 10 from the opening 13 with a blower (not shown), or by sucking and lifting the opening 13 side of the first sheet 2 with a suction head (not shown). Then, in this state, the sandwich 6 is inserted into the bag body 10.

[0038] When the sandwich 6 is contained in the bag body 10, the opening shape of the opening 13 becomes rectangular, as shown in FIG. 1(b). The portions spanning the side joint portions 12 of the first sheet 2 and the second sheet 3 become a pair of opposing triangular side portions. The middle portion of the first sheet 2 becomes a rectangular front portion. The middle portion of the second sheet 3 becomes a rectangular back portion.

[0039] After the sandwich 6 is contained in the bag body 10, first, as shown in FIG. 7(c), the sheet piece (back sheet piece) of the second sheet 3 among the excess sheet pieces (sheet pieces protruding from the bottom surface of the sandwich 6) at the opening 13 is folded so as to cover the bottom surface of the sandwich 6. Next, as shown in FIG. 7(a), either the left or right sheet piece (one side sheet piece) is folded so as to overlap on the second sheet 3 previously folded. Next, as shown in FIG. 7(b), either the left or right sheet piece (the other side sheet piece) is folded so as to overlap on the second sheet 3 previously folded. Next, as shown in FIG. 7(c), the remaining sheet piece (front sheet piece) of the first sheet 2 is folded so as to overlap on the left and right sheet pieces previously folded. In this way, the opening 13 of the food packaging bag 1 is closed.

[0040] However, the order in which the four sheet pieces are folded is not particularly limited; it is also possible to fold the sheet piece at the front portion first, then fold the sheet piece at the side portion, and finally fold the sheet piece at the back portion, or to fold either the sheet piece at the back or front portion first, then fold the other sheet piece at the back or front portion, and finally fold the sheet piece at the side portion, or to fold the sheet piece at the side portion first, then fold the sheet piece at the back or front portion, and finally fold the other sheet piece at the back or front portion, etc.

[0041] Once the opening 13 is closed, tape 8 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.

[0042] Through the above steps, food package 7 is completed as shown in Figures 8 and 9(a). Food package 7 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 and foreign matter from entering the inside, and the intended quality of the packaged sandwich is maintained.

[0043] Furthermore, in food package 7, the tearing portion (tearing line 35) of second sheet 3 is kept airtight by outer sheet 5. Therefore, outside air and foreign matter do not enter the inside through tearing line 35, and in this respect as well, the intended quality of the packaged sandwich is maintained.

[0044] When eating the sandwich, as shown in Figure 9(b), the gripping portion 51 is picked up and pulled. The main body 50 of the outer sheet 5 is joined to the free strip 36 of the second sheet 3. Therefore, when the gripping portion 51 of the outer sheet 5 is picked up and pulled, the free strip 36 is pulled down and an opening 38 is formed in the second sheet 3, and the sandwich can be removed from this opening 38.

[0045] Moreover, the opening portion (opening line 35) is formed in a long, wide band-like region over a wide area of ​​the back portion of the food package 7 (excluding the header portion 15, the same applies below). This forms a large opening 38, making it possible to easily remove the sandwich. With such an opening portion, the upper end of the outer sheet 5 of the food package 7 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 7. In other words, the outer sheet 5 is positioned over almost the entire height of the back portion of the food package 7, and the tab portion 51 is located near the top joint portion 11.

[0046] Here, the food packaging bag 1 of this embodiment is manufactured through a process including a step (first step) of manufacturing a first sheet raw material 2X having a continuous first sheet 2 as shown in FIG. 10, a step (second step) of manufacturing a second sheet raw material 3X having a continuous second sheet 3 as shown in FIG. 11, and a step (third step) of manufacturing the food packaging bag 1 from the first sheet raw material 2X and the second sheet raw material 3X as shown in FIG. 12.

[0047] As shown in FIG. 10, in the first step, a sheet original roll in which an intermediate sheet original 25X having a continuous intermediate sheet 25 is wound in a roll shape and two sheet original rolls in which an end sheet original 26X having a continuous end sheet 26 is wound in a roll shape are each held rotatably. The pair of end sheet originals 26X, 26X have the same width. The intermediate sheet original 25X and the pair of end sheet originals 26X, 26X are fed from the respective sheet original rolls. The pair of end sheet originals 26X, 26X are fed so as to sandwich the intermediate sheet original 25X, and each side edge of the intermediate sheet original 25X and the side edge of the end sheet original 26X are overlapped (overlapped portion 27), and the overlapped portion 27 is joined by heat sealing to form a single sheet original.

[0048] In the second step, a sheet raw roll on which the second sheet raw material 3X is wound in a roll shape is held rotatably, and the second sheet raw material 3X is fed out from the sheet raw material roll. As shown in Fig. 11, the second step includes i) a step of forming a tearing portion (peeling line 35) (step 2-1) and ii) a step of joining an outer sheet 5 so as to cover the tearing portion (peeling line 35) (step 2-2) while intermittently transporting the second sheet raw material 3X.

[0049] The first sheet raw roll 2X and the second sheet raw roll 3X are manufactured in this manner. Then, after each is wound into a roll, the roll is set in a bag making device, or the first sheet raw roll 2X and the second sheet raw roll 3X are manufactured by a bag making device and then continuously transported to the third process.

[0050] As shown in FIG. 12, the third step includes overlapping a first sheet raw material 2X to which an inner sheet 4 has been joined and a second sheet raw material 3X with their inner surfaces facing each other, and transporting them intermittently in this state, while i) forming a top joint 11 (step 3-1), ii) forming a side joint 12 (step 3-2, which may be performed simultaneously with step 3-1), iii) cutting and dividing the side joint 12 along the midline of the side joint 12 to individually separate the food packaging bags 1 (step 3-3), and iv) forming a cutout 14 (step 3-4).

[0051] In addition, because of its shape, this type of trapezoidal food packaging bag 1 is manufactured so that it is oriented horizontally and alternately in the opposite directions with respect to the conveying direction of the sheet raw rolls 2X and 3X. That is, food packaging bags 1 having an opening 13 formed on one side of the width direction (TD) perpendicular to the conveying direction (MD) of the sheet raw rolls 2X and 3X and a header portion 15 formed on the other side of the width direction, and food packaging bags 1 having an opening 13 formed on the other side of the width direction and a header portion 15 formed on one side of the width direction are manufactured alternately. For this reason, in the first sheet raw roll 2X, a pair of end sheet raw rolls 26X and 26X have the same width. In FIG. 12, the configuration related to the former food packaging bag 1 is marked with "A" after the reference numeral, and the configuration related to the latter food packaging bag 1 is marked with "B" after the reference numeral.

[0052] The overall flow of the third step is generally the same as that described in JP 2005-219319 A. However, in the one described in this patent document, the side joints are formed by melt cutting. In contrast, in this embodiment, the side joints 12 are formed by welding and cutting. For welding, a heat seal bar having a width twice the width of the side joints 12, 12 of the adjacent food packaging bags 1, 1, i.e., the width of the side joints 12, is used. This heat seal bar has an end portion corresponding to the side edge (vertical side) of the header portion 15 and a middle portion corresponding to the side edge (oblique side) of the main body 10. For cutting, a Thomson blade is used. This Thomson blade has an end portion corresponding to the side edge (vertical side) of the header portion 15 and a middle portion corresponding to the side edge (oblique side) of the bag main body 10.

[0053] As described above, in the food packaging bag 1 according to this embodiment, paper sheets are used for part of the first sheet 2 and the second sheet 3. Paper sheets are more susceptible to creases than plastic sheets. As a result, the first and second sheets 2, 3 are sharply folded at each side of the food package 7, and the food package 7 has a sharp appearance. Therefore, the food packaging bag 1 according to this embodiment has the effect of providing the food package 7 with excellent appearance, stability, and therefore excellent self-supporting ability.

[0054] Furthermore, paper sheets are more rigid than plastic sheets. This provides stiffness to the first and second sheets 2, 3, which has the effect of improving the self-supporting ability of the food package 7. The stiffness of the first and second sheets 2, 3 also improves the stiffness of the food package 7. Therefore, the food packaging bag 1 according to this embodiment is highly effective in preventing the sandwich 6 from losing its shape.

[0055] Furthermore, the food packaging bag 1 according to this embodiment uses a paper sheet, which allows the amount of plastic used to be reduced. In recent years, waste plastic has become a global environmental problem, but the food packaging bag 1 according to this embodiment is an effective measure against this environmental problem.

[0056] In addition, according to the food packaging bag 1 of this embodiment, the upper tier 22 of the first sheet 2 is partitioned into the upper part and header part 15 of the bag body 10, and the lower tier 24 is partitioned into the lower part of the bag body 10. As a result, in the state where the food packaging body 7 is formed, the upper part, lower part and back side of the front side of the sandwich 6 in an upright state are hidden by the opaque upper tier 22, lower tier 24 and second sheet 3, and only the center part of the front side of the sandwich 6 is visible from the transparent middle tier 23. In other words, only the center part of the sandwich, which looks the most delicious, is visible and emphasized. Therefore, according to the food packaging bag 1 of this embodiment, it is possible to stimulate the consumer's desire to purchase the food in the state where the food packaging body 7 is formed.

[0057] In addition, according to the food packaging bag 1 of this embodiment, the side joint portion 12 is formed in a band shape with a predetermined width along the side edge of the bag body 10 and the side edge of the header portion 15, and is bent at the intersection with the top joint portion 11. As a result, in the state in which the food packaging body 7 is formed, the side joint portion 12 is in a backward state as shown in Figures 8 and 9 (a). In this way, the header portion 15 is in an upright state because pillars are formed on both sides. Moreover, the header portion 15 is in a flat state extending straight from the front portion of the bag body 10. Therefore, according to the food packaging bag 1 of this embodiment, it is possible to improve the appearance in the state in which the food packaging body 7 is formed, and it is possible to easily visually recognize the display on the header portion 15 when it is displayed in a store such as a convenience store.

[0058] <Modification of the first embodiment> In the first embodiment, the first opening line 35a has a shape that gradually becomes wider toward the other end side of the second sheet 3, specifically, it is a mountain shape (inverted V shape). In addition, as shown in FIG. 13, the opening line 35 has a pair of third opening lines 35c, 35c on the left and right sides on the top joint portion 11 side. The third opening line 35c is a opening line having a component toward the outside in the width direction of the second sheet 3. The third opening line 35c is a straight or curved cut line that extends obliquely upward from a predetermined portion of 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 straight or curved cut line that extends from a predetermined portion of the first opening line 35a toward the outside in the width direction of the second sheet 3 along the width direction of the second sheet 3. In this example, the third opening line 35c is a straight cut line extending from a central bend point (intersection point of two lines) of the first opening line 35a in the extension direction of the first opening line 35a.

[0059] If the food package 7 needs to be opened further, the second sheet 3 on the left and right of the opening 38 is opened from the left and right free pieces 39 formed between the first opening line 35a and the third opening line 35c in the second stage of opening operation. If the left and right free pieces 39 are pinched and pulled outward in the width direction of the second sheet 3, the second sheet 3 is torn outward in the width direction starting from the third opening line 35c because the second sheet 3 has a tear direction in the width direction outward due to the third opening line 35c. This allows the opening 38 to be opened widely to expose the sandwich in a large area. Note that the second stage of opening may be opened only on one side of the left or right side, or only on the other side. Of course, both sides may be opened like a double door.

[0060] <Second embodiment> Next, a food packaging bag according to a second embodiment of the present invention will be described with reference to Fig. 14. The second embodiment differs from the first embodiment in terms of the opening portion (opening line 35). Other than this, the two are the same. Therefore, the following will describe the differences, and the same points will be omitted, as they are the same as those described for the first embodiment.

[0061] As shown in Fig. 14(a), the opening portion is composed of a first opening line 35d and a second opening line 35e. The first opening line 35d is formed near the top joint 11 and is a horizontal linear cut line along the top joint 11. The second opening line 35e is a pair of vertical parallel linear cut lines extending from both ends of the first opening line 35a toward the other end of the second sheet 3. The opening portion and the outer sheet 5 have the same size as the opening portion and the outer sheet 5 according to the first embodiment.

[0062] As shown in FIG. 14(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. 14(c), the opening line 35 is a cut line having a connecting portion 37 connecting the inner region (free strip 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 left and right location on the top joint 11 side (in the illustrated example, the intersection of the first opening line 35d and the second opening line 35e). Alternatively, as shown in FIG. 14(d), the opening line 35 is a cut line having the connecting portion 37 at a wide appropriate interval (in the illustrated example, one left and right location on the top joint 11 side and one location on each of the second opening lines 35e). Alternatively, as shown in FIG. 14(e), the opening line 35 is a perforated or dashed cut line.

[0063] Also, like the modified example of the first embodiment, the opening line 35 may have a pair of third opening lines on the left and right sides on the top joint portion 11 side. For example, the third opening line is a straight or curved cut line extending obliquely upward from a predetermined portion 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 from a predetermined portion of the second opening line 35e along the width direction of the second sheet 3 to the outside 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.

[0064] As described above, the food packaging bag according to this embodiment also provides the same effects as those provided by the food packaging bag according to the first embodiment.

[0065] <Third embodiment> Next, a food packaging bag according to a third embodiment of the present invention will be described with reference to Fig. 15. The third embodiment differs from the first or second embodiment in terms of the opening portion (opening line 35). Apart from this, the two are the same. Therefore, the following will describe the differences, and will omit the same points as those in the first embodiment, since they are the same as those in the first embodiment.

[0066] As shown in Fig. 15(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 in the vicinity of the top joint portion 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 portion 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 the outer sheet 5 have the same size as the tearing portion and the outer sheet 5 according to the first or second embodiment.

[0067] When eating the sandwich, after peeling off the outer sheet 5 from the second sheet 3 (first stage opening operation), in the second stage opening operation, the second sheet 3 on the left and right of the second opening line 35g is opened 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, the second sheet 3 is torn outward in the width direction starting from the first opening line 35f, since the second sheet 3 has a tear direction in the width direction outward due to the first opening line 35f. This allows the opening 38 to be opened widely to expose the sandwich widely. In the second stage opening, only one side of the left or right side may be opened, or only the other side may be opened. Of course, both sides may be opened like a double door.

[0068] As described above, the food packaging bag according to this embodiment also provides the same advantageous effects as those provided by the food packaging bag according to the first or second embodiment.

[0069] <Fourth embodiment> Next, a food packaging bag according to a fourth embodiment of the present invention will be described with reference to Fig. 16. The fourth embodiment differs from the first to third embodiments in terms of the opening portion, specifically, in that the opening 38 is not formed by opening the free strip 36 and the left and right free strips 39 in the second sheet 3 by the opening operation, but rather the opening 38 is formed from the beginning without the free strip 36 and the left and right free strips 39. Other than this, the two are the same. Therefore, in the following, the differences will be described, and the same points will be omitted as they are the same as those in the first embodiment.

[0070] The tearing portion (opening 38) is formed to a size corresponding to the rear portion of the food package 7, taking into consideration ease of removal of the sandwich. More specifically, the tearing portion is formed in an area where each side of the rear portion of the food package 7 is offset inward leaving a joining width with the outer sheet 5. Therefore, the tearing portion and the outer sheet 5 are larger than the tearing portion and the outer sheet 5 according to the first to third embodiments. Furthermore, since the outer sheet 5 is larger, the upper end of the opening 38 is located in a position close to the apex joint 11, and the main body portion 50 of the outer sheet 5 is joined in a position close to the apex joint 11. Therefore, the tab portion 51 of the outer sheet 5 overlaps the apex joint 11 and advances into the header portion 15.

[0071] The coating agent applied to the outer sheet 5 is one that does not pose any problem in terms of food safety, but it is better to avoid direct contact with the sandwich. Therefore, in this embodiment, no coating agent is applied to the area of ​​the inner surface of the outer sheet 5 that corresponds to the opening 38 (or an area slightly larger than this).

[0072] Furthermore, if a tear line similar to the third tear line according to the modified example of the first embodiment is formed on the top joint portion 11 side (e.g., both left and right corners) of the opening 38 or on the other end side (e.g., both left and right corners) of the second sheet 3 of the opening 38, the opening 38 can be made larger. 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 according to the first to third embodiments.

[0073] As described above, the food packaging bag according to this embodiment also provides the same advantageous effects as those provided by the food packaging bags according to the first to third embodiments.

[0074] <Other embodiments> 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 gist of the present invention.

[0075] In the above embodiment, the outer sheet 5 is formed to a size that fits into the rear portion of the food package 5. However, the present invention is not limited to this. For example, as shown in Fig. 17(a), the outer sheet 5 may have a size (length) that allows it to extend into the header portion 15.

[0076] In the above embodiment, the outer sheet 5 is joined to the second sheet 3 over the entire surface of the main body 50 (solid seal). However, the present invention is not limited to this. For example, as shown in FIG. 17(b), the outer sheet 5 may be joined to the second sheet 3 by a frame-shaped outer joint 53 surrounding the tear line 35. In the illustrated example, the outer joint 53 is a strip having a predetermined width, and is formed on the inside with a predetermined width from the outer periphery of the outer sheet 5. As a result, the outer periphery of the outer sheet 5 is a non-jointed portion.

[0077] In the above embodiment, 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 the outer surface as well. However, the present invention is not limited to this. For example, the outer sheet may have adhesive properties or bonding properties on the inner surface and be peelably adhesive or bonded to the second sheet. This is effective when the second sheet 3 does not have thermal welding properties on the outer surface.

[0078] In the above embodiment, the end sheet 26 and the second sheet 3 are paper sheets made of a laminated sheet of paper and plastic. However, the present invention is not limited to this. The end sheet and the second sheet may be paper sheets made of mixed paper, synthetic paper, etc. In short, the end sheet and the second sheet may be any type of paper sheet as long as they have thermal adhesion on the inner side.

[0079] In the above embodiment, the end sheet 26 is a paper sheet having thermal adhesion on the inner side. However, the present invention is not limited to this. The end sheet may be a paper sheet having thermal adhesion on the outer side in addition to the thermal adhesion on the inner side. Alternatively, the end sheet may be a paper sheet having thermal adhesion only on the outer side. In these cases, the edge of the intermediate sheet and the edge of the end sheet can be overlapped so that the inner surface of the edge of the intermediate sheet and the outer surface of the edge of the end sheet face each other. The same applies to the second sheet.

[0080] 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 composed only of the bag body.

[0081] In addition, in the present invention, terms that specify a shape, part, or state, such as "trapezoid," "triangular," "rectangular," "rectangular," "straight line," "center," "end," "side," "coincident," "same," "parallel," and "orthogonal," not only include the term itself, but also include the concept of "approximately" in the sense of being close to or similar to it.

[0082] 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, rice balls, or other cooked food, as long as the food can be accommodated in a food packaging bag.

[0083] In addition, the intermediate sheet of the first sheet used in the food packaging bag is not limited to one made of a plastic sheet (plastic film). For example, it may be a sheet (film) made of other materials such as paper or paper-like sheet. Also, it may be a laminated sheet (laminated film) made of sheets (films) made of multiple materials, instead of a sheet (film) made of a single material. Also, the sheet may be one formed of multiple sheets (films), such as one formed by joining the ends of two sheets (films) together to form a single sheet, or one formed by joining the ends of three sheets (films) one by one to form a single sheet. In this case, the materials of each sheet (film) may be different. For example, some sheets (films) may be made of paper or paper-like sheet instead of plastic sheet (plastic film). In the present invention, the sheet is not defined by thickness, but is a concept that includes a film. [Explanation of symbols]

[0084] 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 roll, 20...body, 21...tip, 22...upper portion, 23...middle portion, 24...lower portion, 25...intermediate sheet, 25X...intermediate sheet roll, 26...end sheet, 26X...end sheet roll, 27...overlap, 3...second sheet, 3X...second sheet roll, 30...body , 31...tip portion, 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...grip portion, 52...inner joint portion, 53...outer joint portion, 6...sandwich, 7...food packaging body, 8...tape

Claims

1. a bag body including a pair of overlapping sheets each having a shape in which one end side is wider than one end side in a first direction, the bag body being sealed on three sides by a top joint portion on the one end side and side joint portions on both sides, and the other end side being an opening; One sheet is a single sheet formed by joining ends of a plurality of sheets together so that the sheet is divided into an upper portion, a middle portion, and a lower portion, the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; the upper sheet, the lower sheet and the other sheet of the one sheet are paper sheets; The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body, The opening portion is composed of a first opening line consisting of a cut line having a shape that gradually becomes wider toward the other end side of the other sheet in the vicinity of the top joint portion, and a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and the opening line has a connecting portion that connects the inner region and the outer region of the opening line of the other sheet with a narrow width at the left and right locations on the top joint portion side. Food packaging bags.

2. A pair of sheets having a shape in which one end in a first direction is wider than the other end are overlapped, and a bag body is provided which is sealed on three sides by a top joint at one end and side joints on both sides, and the other end is an opening, one sheet is a single sheet formed by joining ends of a plurality of sheets together so that the sheet is divided into an upper portion, a middle portion, and a lower portion; the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; the upper sheet, the lower sheet and the other sheet of the one sheet are paper sheets; The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body, The opening portion is composed of a first opening line consisting of a cut line having a shape that gradually becomes wider toward the other end side of the other sheet in the vicinity of the top joint portion, a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and a third opening line consisting of a pair of cut lines extending diagonally upward to the left and right or outward in the width direction to the left and right from a predetermined portion of the first opening line, and the opening line has a connecting portion at the left and right locations on the top joint portion side that connects the inner region and the outer region of the opening line of the other sheet with a narrow width. Food packaging bags.

3. A bag body is provided in which a pair of sheets having a shape in which one end in a first direction is wider than the other end are overlapped, and three sides are sealed by a top joint at one end and side joints on both sides, with the other end being an opening, one sheet is a single sheet formed by joining ends of a plurality of sheets together so that the sheet is divided into an upper portion, a middle portion, and a lower portion; the other sheet includes a tearing portion and an outer sheet that is joined to the sheet while covering the tearing portion from the outer surface side of the sheet and has a tab; the upper sheet, the lower sheet and the other sheet of the one sheet are paper sheets; The middle sheet of one of the sheets is a plastic sheet, The side joint is formed in a strip shape with a predetermined width along the side edge of the bag body, The opening portion is composed of a first opening line consisting of a cut line along the top joint portion in the vicinity of the top joint portion, and a second opening line consisting of a pair of cut lines extending from both ends of the first opening line toward the other end side of the other sheet, and the opening line has a connecting portion at the left and right parts of the top joint portion that connects the inner region and the outer region of the opening line of the other sheet with a narrow width. Food packaging bags.

4. A header portion is provided which is formed of a protruding piece of each sheet protruding from the top joint portion, The side joint portion is formed in a strip shape with a predetermined width along the side edge of the bag body and the side edge of the header portion, The upper section is divided into an upper portion of the bag body and a header section, The middle section is defined in the middle of the bag body and has a trapezoidal shape, The lower section is defined at the bottom of the bag body and has a trapezoidal section continuing to the middle section and a section narrowed by cutouts formed at both corners of the bag body on the opening side. The food packaging bag according to any one of claims 1 to 3.

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