JP7649033B2 - Packaged sandwich and sandwich packaging method - Google Patents

Description

This invention relates to a technology for packaging right-angled triangular sandwiches in a food packaging sheet.

Sandwiches in the shape of a right triangle are stored in a packaging bag made of plastic film and displayed in stores. The sandwich packaging used is a bag-shaped packaging made of plastic film with an isosceles trapezoidal portion. A connection part of a specified width is formed at the hypotenuse and upper side of the isosceles trapezoidal portion, and the lower side of the isosceles trapezoidal portion is an opening where the upper and lower plastic films are not connected. The right-angled triangular sandwich is placed through the opening of this packaging bag, and the opening is folded and sealed. Patent Documents 1, 2, and 3, among others, describe packaged sandwiches in which such right-angled triangular sandwiches are packaged in a packaging bag.

Patent Documents 4 and 5 describe a sandwich package in which at least one seal is applied in the longitudinal direction of a film that is wrapped around the sandwich in the thickness direction and formed into a cylindrical shape, and the film is folded along the inclined surfaces based on the sides where the inclined surfaces on which the short sides of the sandwich are located meet, and the lateral extensions of the film that contact each short side of the sandwich are folded along the inclined surfaces based on the short sides to be packaged.

Furthermore, Patent Document 6 describes a sandwich package that includes a triangular prism-shaped sandwich and a tubular packaging sheet that has a sloped portion that follows the slope of the sandwich and a pair of bottom portions that follow the pair of bottom portions, respectively, and that covers the periphery of the triangular prism-shaped object, and each excess portion of the tubular packaging sheet that corresponds to each side that is connected to the slope and both bottom surfaces of the sandwich is formed into a gusset portion that is folded from both sides and a side portion that is connected to both gusset portions and placed on the surface side along each side, and the extended portions of the sloped portion and the extended portions of the side portion are sealed to each other to hermetically package the sandwich.

JP 2004-315064 A JP 2013-166566 A Japanese Patent Application Publication No. 9-24950 Japanese Patent Application Publication No. 6-24466 Japanese Patent Application Publication No. 7-291348 JP 2003-291915 A

In the sandwich packaging materials described in Patent Documents 1 and 2, the opening is folded and sealed, but this folding process is difficult to automate and is done manually. In Patent Document 1, after folding, adhesive tape or the like is applied to seal the opening.

In the invention of Patent Document 3, the entire width of the opening is heat-sealed, and the inside of the bag is sealed using the opening as the sealing part, which is expected to further improve the sealing performance. However, a detailed study of the invention of Patent Document 3 revealed that this is difficult to achieve. First, two sets of heating devices that are perpendicular to each other are required, and these two sets of heating devices must be controlled, making the equipment complex and expensive. Moreover, it is difficult to accurately apply pressure that deforms the mouth of the packaging bag at a right angle from its original state.

Patent Document 4 and Patent Document 5 state that packaging can be done using a continuous strip of film, which keeps packaging costs low and makes it easy to automate sandwich packaging. However, Patent Document 4 and Patent Document 5 do not provide a sheet to cover the slanted sides of the sandwich. A triangular sandwich is made by stacking multiple rectangular pieces of bread with ingredients between them and cutting them along the diagonal, but the ingredients are exposed on the slanted sides, which are the cut surfaces, and if the sandwich is wrapped in the main sheet of packaging material as is, the ingredients will stick to it, which is unpleasant and unhygienic. Patent Document 4 describes a cutting line made of perforations as a means of opening, and Patent Document 5 describes an opening cut, but these opening methods are troublesome to open.

Patent Document 6 shows how the tubular packaging sheet is folded so that it is in close contact with the sandwich while the sandwich is surrounded by the tubular packaging sheet, and also describes placing a topping sheet on the sloping surface of the sandwich. However, when placing the sandwich, the topping sheet must be placed on the sloping surface between the sandwich and the tubular packaging sheet beforehand, or the sandwich is placed on the tubular packaging sheet with the topping sheet placed on it, making it difficult to automate packaging. Also, in Patent Document 6, the opening notch formed in the center seal is pinched and the side portion is torn away from the center seal to open the package. However, it is difficult to properly open the side where the sheet is folded using only the opening notch.

The object of this invention is to provide a packaged sandwich that can be packaged automatically and is easy to open.

In order to solve the above problems, the packaged sandwich of the present invention is a triangular prism-shaped sandwich having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of the two sides intersecting at the right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, packaged in a packaging material formed by folding a rectangular packaging sheet,
The packaging material includes a back seal portion formed along the first rectangular surface and the second rectangular surface;
a fold formed on the first rectangular surface and the second rectangular surface;
a seal portion formed along each of a common edge of the first rectangular surface and the third rectangular surface and a common edge of the second rectangular surface and the third rectangular surface;
An opening assist line provided along a common side of the first rectangular surface and the second rectangular surface;
A stain-blocking sheet is provided adjacent the third rectangular face and the two right-angled triangular faces of the sandwich.
The packaging sheet comprises a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a stain-prevention sheet provided inside the paper sheet, and a separation assisting line provided along the center line of the stain-prevention sheet, and further comprises an opening tape provided along the separation assisting line as an opening assisting line ,
A tear tape and a separation assist line are provided along a common edge of the first rectangular surface and the second rectangular surface,
A window may be exposed on the third rectangular surface. The width of the tear tape may be 20 mm or more and 30 mm or less.

The sandwich packaging method of the present invention is a method for packaging a triangular prism-shaped sandwich having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of two sides intersecting at a right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle,
A sandwich packaging roll having a continuous belt-shaped packaging sheet portion and an opening assist line continuously provided inside the packaging sheet portion is periodically cut at a constant length to form a rectangular packaging sheet,
The sandwich is placed in such a manner that a common edge of the first rectangular surface and the second rectangular surface of the sandwich overlaps with the opening assist line in a plan view, and the third rectangular surface is placed in contact with the packaging sheet;
The two sides perpendicular to the cutting line are sealed together to form a back portion, forming a rectangular tube having the sandwich inside;
folding a portion of the packaging sheet over the first rectangular surface and the second rectangular surface to form a fold on each of the first rectangular surface and the second rectangular surface;
The sealing is performed by sealing along each of the common sides of the first and third rectangular faces and the common sides of the second and third rectangular faces.
The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a dirt prevention sheet provided inside the paper sheet, and a separation assist line provided along the center line of the dirt prevention sheet, and an opening tape provided along the separation assist line is used as the opening assist line ,
The tear tape and separation assist line may be wrapped along a common edge of the first and second rectangular faces.
The packaging sheet includes a pair of paper sheets spaced apart from each other, a transparent film between the pair of paper sheets and attached to the outer surface of the paper sheets by easily peelable adhesion, and a stain-preventing sheet attached to the inner surface of the transparent film.
A transparent film may be wrapped around the first and second rectangular faces along a common edge.

Furthermore, the sandwich packaging base material of the present invention comprises a pair of paper sheets spaced apart from each other and arranged continuously, a transparent film arranged between the pair of paper sheets, a pair of stain-prevention sheets spaced apart from each other and arranged on the inner surface of the transparent film, and a tear tape arranged between the pair of stain-prevention sheets. Also, another sandwich packaging base material comprises a pair of paper sheets spaced apart from each other, a transparent film between the pair of paper sheets, the first surface of which is attached to the paper sheet by easily peelable adhesion, and a stain-prevention sheet arranged on the first surface of the transparent film.

The packaged sandwich of the present invention can be automated. An opening assist line is provided along the common edge of the first rectangular surface and the second rectangular surface, and when opening the sandwich, the sandwich can be cut along the center, allowing the sandwich to be easily removed.

FIG. 1 is a perspective view showing a wrapped sandwich. FIG. 2 is a perspective view showing the outer shape of the sandwich as seen from the oblique side. FIG. 2 is a perspective view showing the outer shape of the sandwich as seen from a vertical surface side. FIG. 2 is a plan view showing a first example of a packaging sheet. FIG. 2 is a plan view showing a first example of a sandwich packaging roll. FIG. 2 is a perspective view showing a state in which the packaging sheet is formed into a cylindrical shape. 1 is a perspective view showing a state in which the packaging sheet is in contact with a first rectangular surface. 1 is a perspective view showing a state in which one of the ears is folded onto a first rectangular surface. 1 is a perspective view showing a state in which both ears are folded onto a first rectangular surface. 1 is a perspective view showing a state in which the protruding portion of the sheet has been heat-sealed. FIG. 11 is a plan view showing a second example of the packaging sheet. FIG. FIG. FIG. 11 is a plan view showing a second example of a sandwich packaging roll. FIG. 11 is a perspective view showing the wrapped sandwich of the second example, seen from the oblique side. FIG. 11 is a plan view showing a third example of a packaging sheet. FIG. FIG. 11 is a plan view showing a third example of a sandwich packaging roll. FIG. 13 is a perspective view showing a third example wrapped sandwich. FIG. 11 is a plan view showing a fourth example of a packaging sheet. FIG. FIG. 11 is a plan view showing a fourth example of a sandwich packaging roll. FIG. 13 is a perspective view showing a fourth example of a wrapped sandwich. FIG. 13 is a plan view showing a fifth example of a packaging sheet. FIG. FIG. 11 is a plan view showing a fifth example of a sandwich packaging roll. FIG. 10 is a perspective view showing a wrapped sandwich of the fifth example.

The embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a perspective view of a packaged sandwich, Fig. 2 is a perspective view of the sandwich from an oblique side showing its outer shape, and Fig. 3 is a perspective view of the same sandwich from a vertical side.

The sandwich to be packaged will now be described. The sandwich 30 to which the present invention is applied is a triangular sandwich as shown in Figures 2 and 3. It is a triangular prism having a pair of opposing right-angled triangular faces 34, a first rectangular face 31 and a second rectangular face 32 along each of the two sides that intersect at the right angle of the right triangle, and a third rectangular face 33 along the hypotenuse of the right triangle. In other words, the third rectangular face 33 is the inclined face of the sandwich, and the first rectangular face 31 and the second rectangular face 32 are vertical faces. Here, the two sides that intersect at the right angle may be an isosceles right triangle (L = H) in which the lengths are the same, or may be different (L ≠ H). In the case of an unequal side, the direction of the short side L is the length, and the direction of the long side H is the height. In this example, H is slightly longer than L, and the length L is 97 mm, the height H is 102 mm, and the width W is 65 mm.

Sandwiches are made by stacking several rectangular slices of bread, usually two or three, with ingredients sandwiched between them. By cutting this along the diagonal, a triangular prism-shaped sandwich is obtained. Therefore, the ingredients are exposed on the third rectangular surface 33, which is the cut surface. Usually, two or three sandwiches are stacked and packaged in one packaging sheet. Figures 2 and 3 show the external appearance of the stacked sandwiches.

The packaging sheet will now be described. Figure 4 is a plan view showing a first example of the packaging sheet. The shape and structure of the packaging sheet are set based on the outer shape of the sandwich to be packaged. The packaging sheet 10 is rectangular, and the surface that contacts the sandwich during packaging is shown as the upper surface in Figure 4. The region R3 that should contact the third rectangular surface 33 of the sandwich is shown in the center of Figure 1 as a vertically long rectangle. On both sides of the region R3, there are regions R4 that contact the triangular surface 34 of the sandwich, and on the outside of that, there are regions R1 that should contact the first rectangular surface 31 and R2 that should contact the second rectangular surface 32. Further outside, a back-sealed region R5 is shown along the edge. The remaining portion is the region that is folded over during packaging. In this example, an unsealed region is left between the edge of the end and the back-sealed region R5.

The opening assistance line 12 is provided along a line connecting the right angles of the region R4 where the two triangular faces meet. When the triangular face 34 is an isosceles triangle, it is along the center line of the width of the packaging sheet 10, but when it is scalene, it is offset from the center line. The opening assistance line 12 may be any line that is effective for separating the packaging sheet 10 along the line, and may be, for example, a perforation or a half cut. In this example, an opening tape called a cut tape is attached to the surface that comes into contact with the sandwich when packaging, the surface that appears on the front side in Figure 4. In addition, cuts are made in the sheet body at both ends of the opening tape to create tabs at the ends of the opening tape, which serve as opening start points when opening.

The main body sheet 11 can be made of a wide variety of materials suitable for packaging, such as transparent film or paper. In the example of FIG. 1, it is made of a single sheet material, but it may be made of a combination of multiple materials, such as a paper sheet and a transparent film, as in the example described below. When using a paper sheet, a polylaminate or dry coat is provided on the surface that comes into contact with the sandwich to form a heat-sealable layer.

Figure 5 is a plan view showing a first example of a raw material for sandwich packaging. The raw material for sandwich packaging is a series of packaging sheets 1 as shown in Figure 4. It has a continuous belt-shaped main body sheet and opening assist lines arranged continuously in the main body sheet along the length of the main body sheet. In this example, opening tape is continuously attached to the main body sheet. The raw material is cut from the leading end at intervals based on the length of one packaging sheet, and packaging sheets are produced one after another. The raw material for sandwich packaging is provided to the person who will package the sandwiches in a wound state on a bobbin.

The sandwich packaging method will be described. A sandwich packaging roll of the length of one packaging sheet is pulled out from a bobbin on which the sandwich packaging roll is wound and cut. This forms one packaging sheet. Then, the third rectangular surface 33 of the sandwich x is placed facing downwards in the region R3 that contacts the third rectangular surface at the center of the packaging sheet 1. At this time, the first rectangular surface 31 and the second rectangular surface 32 face upwards. The common side of the first rectangular surface 31 and the second rectangular surface 32 aligns with the position of the opening assist line 12 in a plan view.

Next, both ends of the packaging sheet 1 (the left and right ends in FIG. 4 ) are lifted and wrapped around the sandwich 30, and the back seal areas R5 of both ends are joined together and heat sealed on the upper side. This forms the back seal part 2, and the packaging sheet 1 becomes a rectangular tube with the sandwich 30 inside (FIG. 6 ). At this time, the triangular surface contact area R4 of the packaging sheet 1 is in contact with the triangular surface 34 of the sandwich x.

There is a space between the top surface of the cylindrical packaging sheet 1 and the first and second rectangular surfaces 31 and 32. One of the rectangular surfaces, for example the packaging sheet on the first rectangular surface 31, is folded so as to press it against the first rectangular surface 31. The contact area R1 of the packaging sheet 1 with the first rectangular surface is in contact with the first rectangular surface 31. At this time, the sheet portion outside the contact area R1 is folded to form ears on both sides of the first rectangular surface 31 (Figure 7). One of these ears is folded along the side of the first rectangular surface 31 and folded onto the first rectangular surface 31 (Figure 8). The other ear is folded in the same way (Figure 9). The packaging sheet on the other rectangular surface, here the second rectangular surface 32, is also folded in the same way. In this way, all sides of the sandwich x are wrapped by the packaging sheet 1.

A portion of the sheet remains on the outside of each of the first rectangular surface 31 and the second rectangular surface 32 as a protrusion. The protrusion is heat sealed along each side of the first rectangular surface 31 and the second rectangular surface 32 to form a seal (Figure 10).

The remaining sheet portions may be folded over one or both of the rectangular faces. In this example, only the protrusion on the second rectangular face 32, which forms the bottom, is folded over. The protrusion on the first rectangular face 31 is left unfolded. In this way, a wrapped sandwich is obtained, wrapped in wrapping material (Figure 1). This process can be largely automated. The step of placing the sandwich on a wrapping sheet cut from the original web may be done manually or may also be automated. The wrapped sandwich is fed out and the next wrapping sheet is pulled from the sandwich wrapping web, and the same process is repeated in sequence.

In the packaged sandwich, the opening assist line goes all the way around the sandwich along approximately the center of the sandwich. It starts at the back seal, runs along the edge common to the first rectangular face 31 and the second rectangular face 32, extends perpendicularly from the apex (right angle) of the next triangular face to the base of the triangular face, crosses the third rectangular face 33, which is a sloping face, continues from the base of the other triangular face to the apex, and then continues along the edge common to the first rectangular face 31 and the second rectangular face 32 to the back seal.

We will now explain how to open a packaged sandwich. The main sheet can be torn apart using the opening assistance line. In this example, a tear tape is used, and as its end is located at the back seal, the main sheet can be torn apart by pinching the end and pulling the tear tape. By pulling all the way through the tear tape, the main sheet is divided into two. Then, by pulling either side of the two pieces, it can be removed from the sandwich, exposing roughly half of the sandwich. This allows the sandwich inside to be easily removed and eaten.

A second embodiment of the present invention will now be described. Figure 11 is a plan view showing a second example of a packaging sheet, Figure 12 is a cross-sectional view taken along line AA of the same, and Figure 13 is a cross-sectional view taken along line BB of the same. The packaging sheet of this example also packages the sandwich shown in Figures 2 and 3. Detailed descriptions of matters common to the first example will be omitted, and the description will focus on matters unique to this example.

The external shape of the packaging sheet 10 is the same as in the first example when viewed from above. In this example, the main sheet 11 is made of a paper sheet 13 as a base material. The surface of the paper sheet 13 that contacts the sandwich, that is, the surface that appears on the front side in Figure 11, is heat-sealable. In this example, a polylaminate is provided. Meanwhile, the opposite surface is overcoated to improve water resistance and oil resistance. Note that paper sheets are also used in the third to fifth examples described below, but in these examples too, a polylaminate and overcoat are similarly applied.

A window portion 14 is provided inside the paper sheet 13. In this example, the window portion 14 is formed by cutting out a rectangle in the paper sheet 13 inside the region R3 where the third rectangular surface 33 of the sandwich is in contact. A transparent film 15 made of plastic, cellophane or the like is attached to the window portion 14. The transparent film 15 is slightly larger than the window portion 14, and its edge is joined to the window portion 14. In this example, the transparent film 15 is joined to the inner surface of the paper sheet 13, i.e., the surface that faces the sandwich when packaged.

A tear tape 16 is provided as an opening aid line on the inside of the paper sheet 13 and transparent film 15, on the front side in FIG. 11. The tear tape 16 is provided at a position that coincides with the common side of the first and second rectangular faces in a plan view when the third rectangular face 33 of the sandwich is placed in region R3.

The stain-prevention sheet 17 is provided further inward from the paper sheet 13, transparent film 15, and tear tape 16, on the front side in FIG. 11. The stain-prevention sheet 17 protects the third rectangular surface 33 (slope), which is the cut surface of the sandwich, and prevents the ingredients exposed on the slope from getting dirty, and prevents the ingredients from sticking to other parts of the packaging sheet or to the hands when opening. In this example, the material is a transparent plastic film. The stain-prevention sheet 17 is large enough to cover the area where more of the ingredients are exposed. In addition, the stain-prevention sheet 17 may be provided only in the region R3 that is in contact with the third rectangular surface 33, but in this example, it is provided along the entire length of the packaging sheet (horizontal direction in FIG. 11). This allows a continuous sheet to be used in the original roll, making it easier to create the original roll.

Furthermore, the stain-prevention sheet 17 is provided with a separation aid line along its length that divides it into two parts. In this example, the stain-prevention sheet 17 is divided into two parts spaced apart from each other. A tear tape 16 is disposed between the pair of stain-prevention sheets.

Figure 14 is a plan view showing a second example of a base roll for sandwich packaging, showing the base roll for the packaging sheet of this example. A belt-shaped paper sheet 13, a pair of stain-prevention sheets 17 on the inner surface of the paper sheet 13, and a tear tape 16 between the pair of stain-prevention sheets 17 are continuously arranged. In addition, rectangular cut-out holes that become the window portions 14 and transparent films 15 that cover the window portions are repeatedly arranged at regular intervals in the paper sheet 13, and this interval corresponds to the length of one packaging sheet. The packaging sheet 10 shown in Figure 11 is formed by pulling out this base roll sheet 20 by the length of one packaging sheet and cutting it.

The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Figure 15 is a perspective view of a packaged sandwich 1 packaged with the packaging sheet 10 of this example, viewed from the third rectangular surface. In this example, a paper sheet 13 is used, so most of the sandwich 30 inside is not visible. However, a window portion 14 of the packaging sheet 10 is located on the third rectangular surface 33, and this surface can be observed from the outside. Since the surface showing the sandwich ingredients is visible, the sandwich can be made to look attractive. Also, consumers can select and purchase a sandwich after seeing the ingredients.

The package is opened by pulling the tear tape 16. The packaging sheet 10, including the transparent film 15 of the window 14, is divided into two parts, so one of them can be removed. Inside the packaging sandwich 1 is a dirt-proof sheet 17 that covers the third rectangular surface 33, but since the dirt-proof sheet 17 has already been divided along the tear tape 16, it can also be easily removed.

As described above, the packaging material is provided with a stain-prevention sheet 17, so the exposed surface of the ingredients can be kept clean. Nevertheless, packaging can be done automatically using a packaging device, and opening is easy. In this example, the packaging sheet is mainly made of paper, and the amount of plastic used is small. Therefore, it is easy to dispose of after use, and even if it leaks outside, the impact on the environment is small.

A third embodiment of the present invention will now be described. Figure 16 is a plan view showing a third example of a packaging sheet, and Figure 17 is a CC cross-sectional view of the same. In this example, a paper sheet 13 is used for the main body sheet 11, and a window portion for observing the sandwich 30 is also provided. In this example, the main body sheet 11 has a pair of paper sheets 13 spaced apart from each other, and a transparent film 15 provided between the pair of paper sheets 13. A window portion is formed by the space separating the paper sheets, and this is covered by the transparent film 15 provided between the paper sheets 13.

A tear tape 16 is provided on the inside of the transparent film 15 as an opening aid line. Also, as in the second example, a pair of stain prevention sheets 17 are provided spaced apart from each other.

Figure 18 is a plan view showing a third example of a base roll for sandwich packaging, showing the base roll for the packaging sheet of this example. It comprises a pair of paper sheets 13 spaced apart from each other and arranged continuously, a transparent film 15 arranged between the pair of paper sheets 13, a pair of stain-prevention sheets 17 spaced apart from each other and arranged on the inner surface of the transparent film 15, and a tear tape 16 arranged between the pair of stain-prevention sheets 17. All of the components are continuous and extend uniformly in the length direction of the base roll 20, making it easy to manufacture and wind up. The packaging sheet 10 shown in Figure 16 is formed by pulling out this base roll 20 to the length of one packaging sheet and cutting it.

The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Figure 19 is a perspective view showing a packaged sandwich packaged with the packaging sheet of this example. In this example, the window and transparent film appear on the triangular surface 34 in addition to the third rectangular surface 33.

The package is opened by pulling the tear tape 16. The tear tape is attached to a transparent film, making it easier to open than paper. In this example, the stain prevention sheet 17 has already been split along the tear tape 16, so it can be easily removed.

The fourth embodiment of the present invention will now be described. Fig. 20 is a plan view showing a fourth example of a packaging sheet, and Fig. 21 is a DD cross-sectional view of the same. In this example, like the third example, the main body sheet 11 has a pair of paper sheets 13 spaced apart from each other, and a transparent film 15 provided between the pair of paper sheets 13. A window portion is formed by the space separating the paper sheets, and this is covered by the transparent film 15 provided between the paper sheets.

As in the second and third examples, a pair of stain-prevention sheets 17 are provided at a distance from each other. Between the pair of stain-prevention sheets 17, a tear-off tape 16 is provided on the inside of the transparent film 15 as an opening assist line. Here, the tear-off tape 16 is wide, being 20 mm or more and 30 mm or less. Here, the width is 25 mm. In addition, a cut 18 is provided in the transparent film and the tear-off tape 16 midway through the tear-off tape 16, forming a tab portion 19. This cut 18 is provided at a position close to the right angle portion in the region R4 where the triangular surface portion 34 contacts.

FIG. 22 is a plan view showing a fourth example of a sandwich packaging roll, and shows the roll for the packaging sheet of this example. The roll includes a pair of paper sheets 13 spaced apart from each other and continuously provided, a transparent film 15 provided between the pair of paper sheets 13, a pair of dirt prevention sheets 17 spaced apart from each other and provided on the inner surface of the transparent film 15, and a tear tape 16 provided between the pair of dirt prevention sheets 17. The tear tape has a width of 20 mm to 30 mm. The sheet height is higher at the location where the tear tape 16 is provided than in other areas, so that when the roll is wound around the paper tube, the area where the tear tape is wound rises up in particular, making it difficult to wind it up neatly. However, since a wide tear tape 16 is used in this example, the part that rises up when wound up is also wide, and the shape of the protrusion is gentle. This makes it easier to wind up and stabilizes the shape of the roll of the roll. The roll 20 is pulled out by the length of one packaging sheet and cut to form the packaging sheet 10 shown in FIG. 20.

The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Figure 23 is a perspective view showing a packaged sandwich packaged with the packaging sheet of this example. In this example, the window and transparent film also appear on the triangular surface 34 in addition to the third rectangular surface 33.

In the sandwich packaging, the tear tape 16 goes around the sandwich along the approximate center of the sandwich. It starts from the back seal 2, runs along the common side of the first rectangular face 31 and the second rectangular face 32, extends vertically from the apex (right angle) of the triangular face 34 to the base of the triangular face, crosses the third rectangular face 33, which is a slanted face, continues from the base of the other triangular face to the apex, and continues to the back seal 2 along the common side of the first rectangular face 31 and the second rectangular face 32. The sandwich packaging 1 in this example has a gripping portion 19 on the triangular face 34. This position makes the gripping portion 19 easy to grip with the fingers. By gripping the gripping portion 19 and pulling the tear tape 16, the transparent film 15 can be cut and the sheet body can be divided.

In the second to fourth examples, a pair of stain-prevention sheets 17 are used, and the dividing portion functions as the separation aid line. However, if it is easily divisible, the separation aid line of other stain-prevention sheets may also be applied. For example, the stain-prevention sheet may be made into a single sheet, with a perforation or half cut provided to serve as the separation aid line. Alternatively, even when a pair of divided stain-prevention sheets is used, both side ends may overlap each other without leaving a gap, and the overlapping portion may be non-adhesive or weakly adhered so that it can be pulled apart with a weak force.

A fifth embodiment of the present invention will now be described. Figure 24 is a plan view showing a fifth example of a packaging sheet, and Figure 25 is an E-E cross-sectional view of the same. In this example, as in the third example, a paper sheet is used for the main body sheet 11, and a window portion for observing the sandwich is also provided. The main body sheet 11 has a pair of paper sheets spaced apart from each other, and a transparent film provided between the pair of paper sheets. A window portion is formed by the space separating the paper sheets, and this is covered by the transparent film provided between the paper sheets.

In this example, the transparent film 15 is not divided, but is a single strip-shaped sheet, and both sides of the transparent film 15 are bonded to the inside of the paper sheet 13 with an easily peelable adhesive. Here, "easily peelable" means that the film has the necessary bonding strength and does not peel off until the package is opened, but can be easily peeled off without a strong force when the package is opened. For example, the surface of the paper sheet 13 at the joint may be smoothed by coating or the like, and a low-adhesion adhesive may be used. The transparent film 15 is provided on the outer surface of the paper sheet 13, that is, the surface facing away from the sandwich when packaged, and is provided on the surface at the back in FIG. 24. In this example, the transparent film 15 is peeled off from the paper sheet 13 when the package is opened, and the transparent film 16 also serves as an opening guide line for the packaging sheet.

Figure 26 is a plan view showing a fifth example of a base roll for sandwich packaging, showing the base roll for the packaging sheet of this example. It comprises a pair of paper sheets arranged continuously with a gap between them, a transparent film 15 bonded to the outer surface of the paper sheets between the pair of paper sheets with an easily peelable adhesive, and a stain prevention sheet 17 attached to the inner surface of the transparent film. The packaging sheet 10 shown in Figure 24 is formed by pulling out this base sheet to the length of one packaging sheet and cutting it.

The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Figure 27 is a perspective view showing the packaging sandwich of the fifth example. In this example, the window portion and the transparent film appear on the triangular surface 34 in addition to the third rectangular surface 33.

The package is opened by peeling the transparent film 15 off the paper sheet 13. The film is easily peeled off. The transparent film 15 is a plastic film that can be separated from the paper sheet 13, so it can be collected as plastic waste. Meanwhile, the paper sheet 13 can be collected as burnable waste that does not contain plastic.

1. Packaging sandwich 2. Back seal 3. Sealed section 10. Packaging sheet 11. Main body sheet 12. Opening aid line 13. Paper sheet 14. Window 15. Transparent film 16. Opening tape 17. Stain prevention sheet 18. Slit 19. Handle 20. Sandwich packaging roll 30. Sandwich 31. First rectangular surface (vertical surface)
32. 2nd rectangular surface (vertical surface)
33. Third rectangular surface (slope)
34. Triangular surface

Claims (7)

A packaged sandwich, the sandwich being a triangular prism having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of two sides intersecting at a right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, packaged in a packaging material formed by folding a rectangular packaging sheet,
The packaging material includes a back seal portion formed along the first rectangular surface and the second rectangular surface;
a fold formed on the first rectangular surface and the second rectangular surface;
a seal portion formed along each of a common edge of the first rectangular surface and the third rectangular surface and a common edge of the second rectangular surface and the third rectangular surface;
An opening assist line provided along a common side of the first rectangular surface and the second rectangular surface;
The wrapped sandwich has a stain-blocking sheet bordering the third rectangular face and the two right-angled triangular faces of the sandwich. The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a dirt-proof sheet provided inside the paper sheet, a separation assisting line provided along the length of the dirt-proof sheet, and an opening tape provided along the separation assisting line as an opening assisting line ,
A tear tape and a separation assist line are provided along a common edge of the first rectangular surface and the second rectangular surface,
2. The wrapped sandwich of claim 1, wherein the third rectangular face defines a window. The packaging sandwich according to claim 2, wherein the width of the tear tape is 20 mm or more and 30 mm or less, and the tear start portion of the tear tape is formed on one of the two right-angled triangular faces. A method for packaging a triangular prism-shaped sandwich having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of two sides intersecting at the right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle,
A sandwich packaging roll having a continuous belt-shaped packaging sheet portion and an opening assist line continuously provided inside the packaging sheet portion is periodically cut at a constant length to form a rectangular packaging sheet,
The third rectangular surface is placed in contact with the packaging sheet so that the common side of the first rectangular surface and the second rectangular surface of the sandwich coincides with the position of the opening assist line in a plan view;
The two sides perpendicular to the cutting line are sealed together to form a back portion, forming a rectangular tube having the sandwich inside;
folding a portion of the packaging sheet over the first rectangular surface and the second rectangular surface to form a fold on each of the first rectangular surface and the second rectangular surface;
A method of sandwich packaging by sealing along a common edge of the first rectangular surface and the third rectangular surface and along a common edge of the second rectangular surface and the third rectangular surface, respectively. The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a dirt-proof sheet provided inside the paper sheet, a separation assisting line provided along the length of the dirt-proof sheet, and an opening tape provided along the separation assisting line as an opening assisting line ,
5. The method for packaging a sandwich according to claim 4, wherein the opening tape and the separation assist line are aligned along a common edge of the first rectangular surface and the second rectangular surface. The packaged sandwich of claim 5, wherein the width of the tear tape is 20 mm or more and 30 mm or less, and the opening start portion of the tear tape is aligned on one of the two right-angled triangular faces. The packaging sheet comprises a pair of paper sheets spaced apart from each other, a transparent film provided between the pair of paper sheets by easily peelable adhesion on the outer surface of the paper sheets, and a stain-preventing sheet provided on the inner surface of the transparent film;
5. The method for packaging a sandwich according to claim 4 , wherein the transparent film is wrapped along a common edge of the first rectangular surface and the second rectangular surface as an opening assist line.

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