Sandwich packaging bag raw material, sandwich packaging bag making device and sandwich packaging method

Abstract

To provide a sandwich packaging bag raw material, a sandwich packaging bag making device, and a sandwich packaging method, which are capable of easily packaging a sandwich in a bag body, reducing an amount of plastic used, and preventing paper waste and paper dust from being generated in an area where the sandwich is packaged.SOLUTION: A sandwich packaging rolled web 1 is pulled out from each of a pair of rolled web rolls 34 on which the sandwich packaging rolled web 1 is wound, the rolled web rolls being made of a paper sheet portion 2 having an approximately isosceles trapezoidal food storage portion 4 and a non-paper sheet portion 3 made of a plastic sheet, which are alternately and continuously connected. The food storage portions 4 of the sandwich packaging rolled webs 1 are overlapped, and a connection part is formed along short sides 5 and side sides 6 of the isosceles trapezoidal shape to form a bag. A right-angled triangular sandwich x is placed into the bag through an opening on a long side 7 of the isosceles trapezoid. The non-paper sheet portion 3 is cut to separate the bag containing the sandwich x from the sandwich packaging rolled web 1. The paper sheet and the plastic sheet remaining on the opening side are folded over and the top is sealed.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a food packaging bag for packaging sandwiches in the shape of a right triangle. [Background technology]

[0002] Sandwiches in the shape of a right triangle are stored in packaging bags made of plastic film and displayed in stores. Patent Document 1 and the like disclose packaging bags for storing such right-angled triangular sandwiches.

[0003] The food packaging bag in Patent Document 1 is a bag body sealed on three sides by a top seal formed by bonding a pair of plastic film sheets together along a line that crosses both sides while leaving a predetermined range at the tip of each sheet as a tab, and side seals formed by bonding both sides of each sheet behind the top seal. The pair of sheets are formed into a trapezoid or trapezoid-like shape with both sides narrowing toward the tip, and after the three sides are sealed to form the bag body, this bag body is expanded three-dimensionally (paragraph 0024 of the same document).

[0004] Furthermore, in the cited document 2, it is described that a paper sheet is cut into a rectangular shape, and then attached to a long plastic sheet, which is then cut or fused to form a triangular food packaging bag, which gives the bag a more substantial and luxurious feel (ibid. 0019).

[0005] Furthermore, Patent Document 3 describes a sealing device that folds and fixes the cylindrical opening of a bag containing a triangular prism-shaped article such as a sandwich from all four sides. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-70084 A [Patent Document 2] JP 2005-35673 A [Patent Document 3] Japanese Patent Publication No. 2002-205701 Summary of the Invention [Problem to be solved by the invention]

[0007] The food packaging bag made from the plastic film sheet described in Patent Document 1 has a trapezoidal bag body in which a right-angled triangular sandwich is placed and packaged. The sandwich can be neatly packaged with almost no gaps, following the shape of the right-angled triangular sandwich. Furthermore, an opening aid such as cutting tape is provided, making it easy to open, and the sandwich inside can be removed through the opening. Furthermore, since it is made from a transparent plastic sheet, the sandwich inside can be easily observed.

[0008] However, plastic containers must be disposed of separately from combustible waste after use. Furthermore, uncollected plastics end up in the environment, becoming one of the causes of marine pollution and posing a problem of adverse effects on the ecosystem.

[0009] The food packaging bag described in Patent Document 2 uses a paper sheet in addition to a plastic sheet. However, Patent Document 2 aims to create a more substantial and luxurious feel. As described in Patent Document 0030, cutting a paper sheet strip to a predetermined length and overlapping the cut paper sheet on a plastic sheet does not reduce the amount of plastic used and increases waste by the amount of paper sheet. Patent Documents 0034 and subsequent documents describe a method in which a plastic sheet strip and a paper sheet strip are unwound from a roll, cut to a predetermined length with a cutter, and then overlapping the edges of the cut plastic sheet and the cut rectangular paper sheet, sealing the overlapping portions with a heat seal bar to alternately join the rectangular plastic sheet and the rectangular paper sheet to form a top sheet strip. However, this process of alternately joining rectangular plastic sheets and rectangular paper sheets is not practical, and even if it could be implemented, it would require extremely complex and large-scale equipment and processes.

[0010] The sealing device disclosed in Patent Document 3 can automatically fold and secure the open cylindrical opening of a sandwich bag that protrudes from the sandwich from all four sides. However, when using conventional sandwich packaging bags such as those disclosed in Patent Documents 1 and 2, the manufacturer of the packaging bag must first create the bag, package and transport it, and supply it to a sandwich packaging company, which must then open it and bring the sandwich packaging bag to the sandwich packaging process. This is time-consuming and labor-intensive, and increases costs.

[0011] Furthermore, to place a sandwich in a flattened sandwich packaging bag, the closed opening of the bag must be opened. This is a time-consuming task. Paragraph 0061 of Patent Document 3 describes a method for manually storing the articles (sandwiches) in order to supply the articles (sandwiches) contained in the bags to a receiver located at an article supply position. The method involves opening bags stacked on a supply table using an air blowing device or a suction device, and then pushing the articles into the opened bag manually or with a pusher. However, manual operation requires a dedicated worker. Furthermore, the device for opening the bag using an air blowing device or a suction device is large and expensive, and there is a risk of failure in opening the bag.

[0012] To provide a sandwich packaging bag stock, a sandwich packaging bag making device, and a sandwich packaging method that can easily accommodate a sandwich in a bag body, reduce the amount of plastic used, and do not generate paper waste or paper dust in the area where the sandwich is packaged. [Means for solving the problem]

[0013] To solve the above problems, the sandwich packaging base fabric of the present invention is a sandwich packaging base fabric in which paper sheet sections each having a substantially isosceles trapezoidal food storage section and non-paper sheet sections are alternately and continuously connected. Rectangular ear sections having the same width as the short sides of the substantially isosceles trapezoidal food storage section are formed adjacent to the short sides, and the non-paper sheet section is a rectangular plastic sheet having the same width as the short sides of the substantially isosceles trapezoidal shape, and one end of the ear section is preferably connected to one end of the non-paper sheet section.

[0014] The first sandwich packaging base may be a sandwich packaging base having a cutout provided inside a rectangle whose one side is the short side of the isosceles trapezoid that forms the food storage section of the paper sheet, and a window formed in the cutout by a transparent sheet attached to the back side of the first paper sheet. The second sandwich packaging base may be a sandwich packaging base as described in claim 2, having, inside a rectangle whose one side is the short side of the isosceles trapezoid that forms the food storage section of the paper sheet, a horizontal cutting line parallel to the short side of the isosceles trapezoid and vertical cutting lines extending perpendicular to the horizontal cutting line from both ends of the horizontal cutting line, and having tear sheets provided on the horizontal cutting line and the vertical cutting line. The first and second sandwich packaging bases may be provided as a pair.

[0015] The sandwich packaging bag making device of this invention comprises two roll-holding members for holding a sandwich packaging roll consisting of a paper sheet portion having a food storage portion of an approximately isosceles trapezoid shape and a non-paper sheet portion made of a plastic sheet, which are connected in a continuous alternating pattern; a connection forming member for forming a connection along the short and side edges of the isosceles trapezoid shape when the food storage portions of the paper sheet portions of the sandwich packaging roll pulled out from each of the two roll-holding members overlap; and a cutting member for cutting the non-sheet portion.

[0016] Furthermore, the sandwich packaging method of this invention involves pulling out sandwich packaging rolls from each of a pair of rolls of sandwich packaging rolls, each roll consisting of a paper sheet portion having an approximately isosceles trapezoidal food storage portion and a non-paper sheet portion made of a plastic sheet, overlapping the food storage portions of each sandwich packaging roll with each other, forming connections along the short and side edges of the isosceles trapezoidal shape to form a bag, placing a right-angled triangular sandwich into the bag through an opening on the long side of the isosceles trapezoid, cutting the non-paper sheet portion to separate the bag containing the sandwich from the sandwich packaging roll, and folding over the remaining paper and plastic sheets on the opening side and sealing the top. A first sandwich packaging base roll has a cutout portion provided inside a rectangle whose side is the short side of the isosceles trapezoid that is the food storage portion of the paper sheet portion, and a window portion formed by a transparent sheet attached to the cutout portion from the back side of the first paper sheet (the side that comes into contact with the sandwich when the sandwich is stored inside); and a second sandwich packaging base roll has, inside the rectangle whose side is the short side of the isosceles trapezoid that is the food storage portion of the paper sheet portion, a horizontal cutting line parallel to the short side of the isosceles trapezoid and vertical cutting lines formed perpendicular to the horizontal cutting line from both ends of the horizontal cutting line, and has opening sheets provided on the horizontal cutting line and the vertical cutting line.The food storage portions of these second sandwich packaging base rolls are overlapped together, and connecting portions are formed along the short side and side sides of the isosceles trapezoid to form a bag, and the sandwich is placed inside the bag so that the surface along the hypotenuse of the right-angled triangle sandwich is aligned with the window portion of the first sandwich packaging base roll. [Effects of the Invention]

[0017] The sandwich packaging bags made from the sandwich packaging roll of this invention use paper for the paper sheet portion, which accounts for the majority of the bag, and are incinerable and easily biodegradable in the environment. This reduces the amount of plastic used and minimizes the negative impact on the environment. Because the roll is supplied to sandwich packers, it can be offered at a lower cost than if the bags were supplied after they were made. It is easy to place sandwiches into the bags, making it easy to automate packaging. Because the paper sheet is not cut in the food packaging area, no paper waste or paper powder is generated, making it clean. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a front view showing a sandwich packaging sheet. [Figure 2] FIG. [Figure 3] FIG. 2 is a front view showing the paper sheet portion of the sandwich packaging roll of the first example. [Figure 4] FIG. 10 is a front view showing the paper sheet portion of a sandwich packaging roll according to a second example. [Figure 5]FIG. [Figure 6] FIG. 10 is a front view showing the paper sheet portion of a sandwich packaging roll of a third example. [Figure 7] FIG. [Figure 8] FIG. 10 is a front view showing the paper sheet portion of a sandwich packaging roll according to a fourth example. [Figure 9] FIG. [Figure 10] FIG. 1 is a front view schematically showing a method for manufacturing a raw sheet for sandwich packaging. [Figure 11] 1 is a front view schematically showing a sandwich packaging bag making device. FIG. [Figure 12] FIG. [Figure 13] FIG. 10 is a right side view schematically showing the start state of bag production. [Figure 14] FIG. 10 is a right side view schematically showing the formation of the connection portion. [Figure 15] FIG. 10 is a right side view schematically showing the insertion of a sandwich. [Figure 16] FIG. 10 is a right side view schematically showing the state in which a sandwich is inserted. [Figure 17] FIG. 10 is a right side view showing the state in which the bag containing the sandwich is lowered. [Figure 18] FIG. 10 is a right side view schematically showing the separation of the bag containing the sandwich. [Figure 19] FIG. 1 is a perspective view showing a bag containing a sandwich. [Figure 20] FIG. 1 is a perspective view showing an example of a packaged sandwich with a sealed opening. [Figure 21] FIG. 1 is a perspective view of the bevel side of the sandwich. [Figure 22] FIG. 1 is a perspective view of the bottom side of the sandwich. [Figure 23] FIG. 1 is a perspective view of the bevel side of the wrapped sandwich. [Figure 24] 1 is a perspective view showing a method of opening the packaged sandwich. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a sandwich packaging base sheet. Sandwich packaging base sheet 1 has a paper sheet portion 2 and a non-paper sheet portion 3, which are alternately connected continuously and at a regular interval. FIG. 2 is an enlarged right side view of portion A, showing the non-paper sheet and its vicinity. Note that although each sheet constituting this sandwich packaging base sheet is thin, the thickness is exaggerated in this cross-sectional view to make the structure easier to understand.

[0020] The paper sheet portion 2 forms the main body of the sandwich packaging bag produced from this sandwich packaging roll, and is primarily made of a paper sheet. This paper sheet may be coated or laminated on one or both sides. It may also be provided with a transparent sheet for forming a window, as in the paper sheet portion of the second example described below. In this example, the coating or lamination for heat sealing is provided on one side.

[0021] The non-paper sheet portion is made of a material other than paper. At least the portion to be cut is made of a material that does not easily produce chips or powder when cut, and in this example, a plastic film such as polypropylene is used.

[0022] Figure 3 is a front view of the paper sheet portion of the sandwich packaging roll of the first example. The paper sheet portion 2 has a food storage section 4 that is approximately isosceles trapezoidal in shape. Continuing from the short side 5 of the approximately isosceles trapezoidal shape of the food storage section 4, a rectangular ear portion 8 is formed, the same width as the short side. Furthermore, on the side of the long side 7 of the approximately isosceles trapezoidal shape, a folding section 9 is formed, which serves as a margin for folding after the sandwich is stored. In this example, the folding section 9 has an isosceles trapezoidal shape that narrows in width as it moves away from the food storage section 4, and an ear-like shape that continues beyond that. This ear-like portion is a rectangle with the same width as the ear portion 9.

[0023] The non-paper sheet portion 3 is rectangular and is provided between adjacent paper sheet portions 2. In this example, the width of the non-paper sheet portion 3 is the same as the width of the ear-shaped portions of the ear portions 8 and the folded portion 9, and both ends of the non-paper sheet portion 3 are connected to the ear-shaped portions of the ear portions 8 and the folded portion 9 with a predetermined length of joint margin. A planned cutting line 10 is set in the non-paper sheet portion 3, in this example, at the center of its length.

[0024] Figure 4 is a front view of the paper sheet portion of a sandwich packaging roll of the second example, and Figure 5 is a rear view of the same. The external shape of the paper sheet portion 2 is the same as in the first example. In this example, a window portion 11 is provided inside the food storage portion 4. The window portion is provided inside a rectangular area surrounded by the short sides of the isosceles trapezoidal shape of the food storage portion 4, two perpendicular lines extending perpendicularly from these short sides toward the long sides 6, and part of the long sides 6. Within the rectangular area, a cutout portion 12 is formed on the side closest to the short sides 6, and a transparent sheet 13 is attached to cover this cutout portion 12. In this example, the cutout portion 12 is rectangular with rounded corners, but it may also be circular, horizontally elongated, or the like.

[0025] Figure 21 is a perspective view of the beveled side of the sandwich, and Figure 22 is a perspective view of the bottom side. Sandwich x is made by stacking multiple rectangular slices of bread, sandwiching ingredients, and cutting them along the diagonal into the shape of a right triangle. In this example, non-square slices of bread are used, and the two perpendicular sides are different lengths, with the surface along the longer side being the vertical surface x2 and the surface along the shorter side being the bottom surface x3. When the sandwich is packaged, window portion 11 is set to fit the beveled surface x1 of the sandwich. A transparent sheet 13 is attached to the surface of paper sheet portion 2 that comes into contact with the sandwich.

[0026] FIG. 6 is a front view of the paper sheet portion of a sandwich packaging roll of the third example, and FIG. 7 is a rear view of the same. The external shape of the paper sheet portion 2 is the same as in the first example. In this example, an opening aid 14 is provided inside the food storage section 4. The opening aid 14 is provided inside a rectangular area surrounded by the short sides of the isosceles trapezoid shape of the food storage section 4, two perpendicular lines extending perpendicularly from the short sides toward the long sides 6, and a portion of the long sides 6. A horizontal dividing guide line 15 is provided horizontally near the short or long sides of the isosceles trapezoid, and vertical dividing guide lines 16 are provided perpendicularly from both ends of the horizontal dividing guide line 15, forming a U-shaped dividing guide line 17, i.e., a rectangular shape with one side missing. In this third example, the horizontal dividing guide line 15 is provided on the short side 5 side.

[0027] The horizontal dividing guide line 15 and the vertical dividing guide line 16 guide the paper sheet so that it separates along those lines. They may completely separate along those lines, or they may be partial separation lines or perforations that alternate between separated and connected portions. In this example, the horizontal dividing guide line 15 and the vertical dividing guide line 16 are formed by perforations. That is, the long side 7 forms an open U-shaped dividing guide portion, and no dividing guide line is provided near the long side of the enclosed portion, connecting it to the rest of the paper sheet. It is preferable to make this dividing guide portion 17 as large as possible, wide enough to allow the sandwiches stored inside to be removed.

[0028] The tear sheet 18 has a cover portion 19 for covering the tear guide portion 17 of the paper sheet, and a tab portion 20 provided below the cover portion 19. The cover portion 19 is roughly rectangular and slightly wider than the tear guide portion 17, i.e., it is large enough to form a connection portion outside the tear guide portion 17.

[0029] The paper sheet 3 and the tear-open sheet 18 are connected by adhesive or the like. Alternatively, they may be connected by heat sealing after laminating or applying a heat-sealing material near the connection portion of either the paper sheet or the tear-open sheet 18. An inner connection portion 21 is provided inside the separation guide portion 17, connecting the paper sheet and the tear-open sheet 18. In this example, it is formed by a narrow portion immediately inside the separation guide portion 17 and a narrow portion extending vertically from near the center of the horizontal separation guide line 15. Outside of this, a non-connection portion 22 is provided along the separation guide portion 17, where the paper sheet and the tear-open sheet 18 are not connected. Furthermore, an outer connection portion 23 is formed outside the separation guide portion 17, connecting the paper sheet and the tear-open sheet 18. This outer connection portion 23 is formed to surround the separation guide portion 17, thereby closing the periphery of the separation guide portion 17 and preventing air from entering or exiting through the separation guide portion 17. Additionally, the tab 20 at the top of the tear sheet 18 is not connected to the paper sheet.

[0030] The sandwich packaging base roll of the second example and the sandwich packaging base roll of the third example are preferably used as a pair, and therefore the pair of the sandwich packaging base roll of the second example and the sandwich packaging base roll of the third example can be provided as a set of sandwich packaging base rolls.

[0031] FIG. 8 is a front view of the paper sheet portion of the sandwich packaging web of the fourth example, and FIG. 9 is a rear view of the same. Like the sandwich packaging web of the third example, it has an opening assisting portion 14, but it is configured upside down. In this example, the horizontal dividing guide line 15 is provided on the long side 7 side. The tab portion 20 of the opening sheet 18 is also provided on the side closer to the long side 7. When a sandwich is wrapped using the sandwich packaging web of this example, the tab portion appears on the top side of the wrapped sandwich, and this tab portion is pulled from top to bottom when opening. The sandwich packaging web of the fourth example can also be paired with the sandwich packaging web of the second example to provide a set of sandwich packaging webs.

[0032] FIG. 10 is a front view showing a schematic diagram of a method for manufacturing a raw sheet for sandwich packaging. The raw paper sheet 30 is a strip-shaped raw sheet consisting of a continuous paper sheet of a fixed width, and serves as the base material for the raw sandwich packaging. In this example, one side (the side facing the viewer in FIG. 8) is laminated or coated with a heat-sealing material to enable heat sealing. This raw paper sheet 30 flows from bottom to top in FIG. 10.

[0033] In the cut-out portion forming process Q1, cut-out portions 31 are formed in the widthwise center of the paper sheet raw material 30 at a predetermined cycle. This cycle corresponds to the length of one sandwich packaging bag. Here, the cut-out portions 31 are rectangular, and their width is wider than that of the non-paper sheet portion 3.

[0034] In the non-paper sheet attaching step Q2, a non-paper sheet 32 ​​is attached to cover the cutout 31. Here, a piece of plastic film is attached by heat sealing.

[0035] In the outer shape forming process Q3, the outer shape of the sandwich packaging roll is formed. One cycle of the sandwich packaging roll 1, i.e., the outer shape of the amount used in one bag manufacturing process, is cut out using a cutter or press. The non-paper sheet 32 ​​is cut out to the narrowest width, forming the non-paper sheet portion 3. The space between the non-paper sheet 32 ​​and the next non-paper sheet 32 ​​is cut out in the shape of the paper sheet portion 2. Here, the paper sheet portion 2 is cut out so that the long side 7 of the isosceles trapezoidal portion 4 faces downstream, or upward in Figure 8, and the short side 5 faces upstream. In this way, one unit is formed.

[0036] By repeating the above process while unwinding the paper sheet roll 30 for each cycle, a sandwich packaging roll is formed and sent downstream. The sandwich packaging roll being formed is wound around a core 33 to form a roll 34. The long side 7 of the isosceles trapezoidal portion 4 of the food storage section 4 of the paper sheet portion 2 for one cycle is wound before the short side 5.

[0037] The above has been explained using the first example of the method for manufacturing the sandwich packaging base material, but the basics are similar for the sandwich packaging base material of the second, third, and fourth examples. Furthermore, in the case of the second example of the sandwich packaging base material, in addition to the above steps, a step of forming window portion 11, i.e., a step of forming cutout portion 12 and a step of attaching transparent sheet 13, is added, and in the case of the third and fourth examples of the sandwich packaging base material, a step of forming separation guide portion 17 and attaching tear sheet 18 is added.

[0038] The sandwich packaging method will now be described. Fig. 11 is a front view showing a schematic diagram of a sandwich packaging bag making device, and Fig. 12 is a right side view thereof. Sandwich packaging bag making device 40 is equipped with two workpiece holding members 41a, 43b that hold sandwich packaging workpieces 1a, 1b, a joint forming member 42 that forms a joint in paper sheet portion 2, and a cutting member 43 that cuts non-sheet portion 3. Furthermore, downstream side roller 45 is provided downstream of joint forming member 42, and upstream side roller 45 is provided upstream of joint forming member 42.

[0039] The joint-forming member 42 forms a joint along the short sides 5 and side edges 6 of the isosceles trapezoid when the food storage sections 4 of the paper sheet portions 2 of the sandwich packaging rolls 1a, 1b, pulled out from the two rolls, are overlapping. In this example, it is a heat bar shaped to fit the short sides 5 and side edges 6 of the isosceles trapezoid. This heat bar may be provided in a pair. One of the heat bars may be an unheated pressing member of the same shape, or it may be a plate-shaped pressing member. This pair of members is movable toward and away from each other.

[0040] The cutting member 43 may be a heated blade that melts and cuts the plastic film, or may be a traveling blade that cuts the sheet while traveling. When not cutting, the cutting member 43 can be retracted to a position where it does not come into contact with components such as the sandwich packaging material and the joint-forming member 41.

[0041] The downstream roller 44 is located in a position where it can come into contact with the leading ends of the two sandwich packaging rolls, and is located immediately upstream of the cutting device 43. Here, it is a pair of rollers that can come into contact with each other so as to sandwich the leading ends of the two sandwich packaging rolls. These two rollers are movable toward and away from each other.

[0042] An upstream roller 45 is provided for each of the two sandwich packaging webs 1. An upstream roller 45a is provided for one sandwich packaging web 1a, and an upstream roller 45b is provided for the other sandwich packaging web 1b, and they pull out the sandwich packaging webs 1a and 1b from their respective web rolls 34a and 34b and feed them into a bag-making position 46 where a joint-forming member is located. These upstream rollers 45a and 45b are synchronized to feed the two sandwich packaging webs 1a and 1b at the same length.

[0043] Upstream of the bag-making position 46, the two sandwich packaging webs 1a, b form a path in which the distance between them widens toward the upstream side. Here, the upstream rollers 45a, 45b are positioned apart from each other to form a path that widens upward, but a similar path may also be formed by a guide member or the like. Upstream of the bag-making position 46, a sandwich insertion space 47 is formed between the two sandwich packaging webs 1a, b.

[0044] Next, the sandwich packaging method will be described. FIG. 13 is a right side view showing the start of bag production. Rolls 34a and 34b are attached to the roll-holding members 41. For example, one roll 34b is the sandwich packaging roll of the second example, and the other roll 34a is the sandwich packaging roll of the third or fourth example. Rolls 1a and 1b of sandwich packaging material are pulled out from the rolls 34a and 34b, respectively, and passed through the upstream rollers 45a and 45b. The leading ends of the rolls are then attached to the downstream roller 45. The downstream roller 45 is closed, and the leading ends of the two overlapping rolls 1a and 1b are sandwiched together. At this time, the pair of members constituting the joint-forming member 42 are spaced apart and retracted to positions that do not interfere with the sandwich packaging rolls 1a and 1b. The two sandwich packaging rolls 1a and 1b are overlapped with their outlines aligned. Here, the raw roll 34 is wound from the long side 7 of the isosceles trapezoidal portion 4 of the paper sheet portion 2, so the short side 5 is pulled out first. Therefore, as shown in Figure 11, the short side 5 faces downward (downstream).

[0045] Figure 14 is a right side view showing the formation of the joint. The two members of the joint-forming member 42 approach each other and close the overlapping paper sheet portions of the sandwich packaging rolls 1a and 1b, sandwiching them together. A joint is formed by heat sealing along the short side 5 and side side 6 of the isosceles trapezoidal portion 4, forming a three-sided bag. The long side 7 of the isosceles trapezoidal portion 4 is not connected.

[0046] FIG. 15 is a right side view showing the sandwich insertion process. After heat sealing is complete, the two components of the connection-forming member 42 move away from each other and return to their retracted positions. Connections are formed on the short sides 5 and side edges 6 of the isosceles trapezoidal portion 4, but the long side 7 of the isosceles trapezoidal portion 4 forms an open opening. The long side 7 of the isosceles trapezoidal portion 4, along with the subsequent folded portion 9 and non-paper sheet portion 3, are connected to the open sandwich packaging rolls 1a and b. Therefore, when the two components of the connection-forming member 42 move away from each other, the opening on the long side 7 of the isosceles trapezoidal portion 4 naturally opens. A sandwich insertion space is formed at the top, allowing sandwich x to be easily inserted into the formed bag. This can be done manually, or an automated sandwich insertion device, already available, can be used.

[0047] The sandwich x is inserted into the bag from the corner x4 where the slope x1 and the vertical x2 intersect, with the surface along the hypotenuse of the right triangle (slope x1) facing one sandwich packaging roll 1b and the surface along the longer perpendicular line (vertical surface x2) facing the other sandwich packaging roll 1a. For example, when using a combination of the sandwich packaging roll of the second example (placed on the right side in the figure) and the sandwich packaging roll of the third or fourth example (placed on the left side in the figure) as a pair, the slope x1 faces the window portion 11 of the sandwich packaging roll of the second example, and the vertical surface x2 faces the opening assist portion of the sandwich packaging roll of the third or fourth example.

[0048] 16 is a right side view showing a schematic view of the state in which a sandwich x is put in. When a sandwich x is put in, the food storage section 4 of the bag deforms to follow the outer shape of the sandwich x.

[0049] Once sandwich x is placed in the bag, downstream roller 44 opens and moves away to a position where it will not interfere with the bag containing sandwich x. Upstream roller 45 rotates, feeding sandwich packaging rolls 1a and 1b by the length of one cycle. This causes the bag containing the sandwich to drop below downstream roller 44. Figure 17 is a right side view showing the bag containing the sandwich in the lowered state.

[0050] Figure 18 is a right-side view showing the process of separating a sandwich-filled bag. When the downstream roller 44 is closed, the opening of the sandwich-filled bag is held in place. At this time, the planned cutting line 10 of the non-sheet portion 3 on the upstream side of the sandwich-filled bag is positioned immediately downstream of the downstream roller 44 at the height of the cutting member 43. The cutting member 43, which was in its retracted position, moves along the planned cutting line 10 while in contact with the non-sheet portion 3. Thus, the non-sheet portion 3 is cut along the planned cutting line 10, and the sandwich-filled bag is separated from the sandwich packaging web 1. The upstream side of the planned cutting line 10 becomes the new leading edge of the sandwich packaging webs 1a and 1b, returning to the state shown in Figure 13. By repeating this process, multiple sandwich-filled bags are sequentially formed. The cutting is performed above the sandwich, but on the non-sheet portion 3, which is made of a material such as plastic film, so no paper waste or paper powder is generated. This prevents foreign matter from adhering to the sandwich, ensuring hygienic operation.

[0051] Although the sandwich packaging rolls 1a, 1b are arranged to flow from top to bottom as described above, they may also flow horizontally. In this case, a path is formed upstream of the bag-making position along which the two sandwich packaging rolls 1a, 1b spread out, forming a sandwich insertion space between the two sandwich packaging rolls 1a, 1b.

[0052] Figure 19 is a perspective view of a bag containing a sandwich. The top is open, revealing the bottom surface x3 of the sandwich facing upward. The portions of the food container 4 near the long side 7, the folded portion 9, and the non-paper sheet portion 3, among others, stand like four walls on the bottom surface x3 of the sandwich x. These four wall-like portions are folded and then sealed with a sticker or adhesive tape 44. Thus, a sandwich package is formed through automated processing. Figure 20 is a perspective view of an example of a packaged sandwich with its top sealed. The majority of the sandwich packaging materials are paper sheets, significantly reducing the amount of plastic used. Sandwich packagers can be provided with raw sandwich packaging material rather than pre-made sandwich packaging bags. This reduces packaging costs. The sandwiches are easily inserted, sandwiches can be packaged without error using simple equipment, and paper dust is not generated during the bag-making and packaging processes.

[0053] Figure 23 is a perspective view of the inclined side of a wrapped sandwich. That is, this is an example of a wrapped sandwich when the second example sandwich wrapping sheet and the third example sandwich wrapping sheet are used as a pair. A window 11 is provided on the inclined surface x1, which is the cut surface of the sandwich, so that the ingredients can be clearly observed. This wrapped sandwich x is displayed in a store with the surface x1 along the oblique side facing forward. In this way, by showing the sandwich ingredients to consumers through the transparent sheet 13, it is possible to stimulate their desire to purchase. Also, by seeing the ingredients, consumers can accurately select the sandwich they want to eat.

[0054] Figure 24 is a perspective view showing how to open a sandwich package, showing the vertical surface x2 side of the sandwich package. This sandwich package bag can be easily opened by pinching the tab 20 with your fingers and peeling the tear sheet 18 from the paper sheet. Because the paper sheet 3 and the tear sheet 18 are only weakly connected by adhesive or heat sealing, they can be easily peeled apart, leaving a large opening through which the sandwich x inside can be easily removed.

[0055] When the sandwich packaging roll of the fourth example is used instead of the sandwich packaging roll of the third example, the tab of the tear-open sheet 18 appears on the upper side, and when opening, the tear-open sheet 18 is peeled off by pulling it down from the top. [Explanation of symbols]

[0056] 1. Sandwich packaging rolls 2.Paper sheet section 3. Non-paper sheet section 4. Food storage section (isosceles trapezoidal section) 5. Short side 6. Hypotenuse 7. Long side 8. Ears 9. Folding section 10. Cutting line 11. Window section 12.Cutout 13.Transparent sheet 14. Opening aid 15.Horizontal cutting guide line 16. Vertically divided guide wire 17. Divided guide section 18. Opening sheet 19. Cover 20. Knob 21.Inner connection part 22. Non-connected part 23.Outside connection 30.Paper sheet roll 31.Notch 32. Non-paper sheets 33. Core material 34. Raw material roll 40.Sandwich packaging bag making equipment 41. Raw material holding member 42.Connection forming member 43.Cutting material 44.Downstream roller 45.Upstream roller 46. ​​Bag making position 47. Sandwich insertion space Q1. The process of forming the notch Q2. Non-paper sheet installation process Q3.Outline forming process x. Sandwich x1.Slope (cut surface) x2.Vertical surface x3.Bottom x4. Corner

Claims

1. A sandwich packaging base sheet consisting of paper sheet sections with approximately isosceles trapezoidal food storage sections and non-paper sheet sections alternately and continuously connected.

2. The food storage section has a substantially isosceles trapezoidal shape, and a rectangular ear portion having the same width as the short side is formed adjacent to the short side. The non-paper sheet portion is a rectangular plastic sheet having a width equal to the short side of the approximately isosceles trapezoidal shape, 2. The sandwich packaging material according to claim 1, wherein one end of the selvage portion and one end of the non-paper sheet portion are connected.

3. A sandwich packaging base sheet as described in claim 2, wherein a cutout portion is provided inside a rectangle having one side as the short side of the isosceles trapezoidal food storage portion of the paper sheet portion, and a window portion is formed in the cutout portion by a transparent sheet attached to the back side of the first paper sheet.

4. Within a rectangle having a short side of the isosceles trapezoid as one side, which is the food storage portion of the paper sheet portion, a horizontal cutting line is formed parallel to the short side of the isosceles trapezoid, and vertical cutting lines are formed perpendicular to the horizontal cutting line from both ends of the horizontal cutting line, 3. The sandwich packaging material according to claim 2, further comprising tear-off sheets provided on the horizontal and vertical cutting lines.

5. two roll-holding members for holding a sandwich packaging roll in which paper sheet sections having food storage sections each having a substantially isosceles trapezoidal shape and non-paper sheet sections made of plastic sheets are alternately and continuously connected; a joint forming member for forming joints along the short sides and side edges of the isosceles trapezoidal shape when the food storage portions of the paper sheet portions of the sandwich packaging rolls pulled out from the two roll holding members are overlapped; A sandwich packaging bag making device equipped with a cutting member for cutting the non-sheet portion.

6. A sandwich packaging sheet is drawn out from each of a pair of rolls of sandwich packaging sheet material, the rolls being made of a paper sheet portion having a substantially isosceles trapezoidal food storage portion and a non-paper sheet portion made of a plastic sheet, which are alternately and continuously connected; The food storage sections of each sandwich packaging roll are overlapped, forming a connection portion along the short sides and side sides of the isosceles trapezoid to form a bag body; Place the right-angled triangular sandwich into the bag through the opening on the long side of the isosceles trapezoid. The non-paper sheet portion is cut to separate the bag containing the sandwich from the sandwich packaging roll; This sandwich packaging method involves folding the remaining paper and plastic sheets on the opening side and sealing the top.

7. a first sandwich packaging base roll having a cutout section provided inside a rectangle having one side as a short side of the isosceles trapezoidal food storage section of the paper sheet section, and a window section formed in the cutout section by a transparent sheet attached to the back surface of the first paper sheet; a second sandwich packaging roll having a rectangular shape with one side being the short side of the isosceles trapezoid, which is the food storage portion of the paper sheet portion, and a horizontal cutting line parallel to the short side of the isosceles trapezoid and a vertical cutting line extending perpendicular to the horizontal cutting line from both ends of the horizontal cutting line, the second sandwich packaging roll having an opening sheet provided on the horizontal cutting line and the vertical cutting line, and the food storage portions of the second sandwich packaging roll are overlapped with each other, and a connection is formed along the short side and side sides of the isosceles trapezoid to form a bag; 7. A sandwich packaging method according to claim 6, wherein the sandwich is placed inside the bag so that the surface along the hypotenuse of the right-angled triangle sandwich is aligned with the window portion of the first sandwich packaging sheet.

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