Sandwich packaging method, packaging film, and package

Abstract

To provide a sandwich packaging means which packages a sandwich with a packaging body, is sealed, and has convenience in opening.SOLUTION: A first step of positioning a sandwich at an intermediate portion of a tubular film body in a longitudinal direction, along which a joining portion of the packaging film having a rectangular shape is formed to form a rectangular tubular shape with both ends open, inside the tubular film body in an orientation in which one side surface is along a first film surface portion and an ingredient cross-sectional portion is along one third film surface portion; A third step of folding inward and sealing a surplus portion of the tubular film body on the sandwich bottom surface side in the longitudinal direction with respect to the sandwich.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a method for packaging sandwiches, a packaging film, and a package. [Background technology]

[0002] The roughly triangular prism-shaped sandwiches sold at convenience stores and other stores are generally wrapped in a wrapping film such as plastic film for the purpose of being easily portable and convenient. The purchaser can open the wrapping film by pulling the seal near the opening handle, remove the sandwich from the wrapping film, and eat it.

[0003] Here, the conventional packaging method for triangular prism-shaped sandwiches is to first mold the packaging film into a triangular prism shape to create a package that can package a roughly triangular prism-shaped sandwich, then leave one side of the package as a hollow portion, insert the sandwich into the triangular prism-shaped packaging film through this hollow portion, and then seal the hollow surface with part of the packaging film.

[0004] Furthermore, although there is a method of packaging sandwiches in a wrapper, the location of the opening portion and the like make it difficult to say that this is an embodiment that is particularly convenient (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-291348 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in conventional sandwich packaging, the sandwich is enclosed in a preformed package, which results in a difference in size between the package and the sandwich to be enclosed, resulting in a gap between the sandwich and the packaging film. This means that the sandwich is prone to shaking inside the package when transported, and there is a risk that the ingredients, such as mayonnaise, from the sandwich will adhere to the ingredient covering material or the package during transport, damaging the appearance of the sandwich as a product.

[0007] The appearance of a product is important for the sale of food products. Therefore, it is desirable to seal the sandwich as closely as possible with the wrapping film, minimize the gap between the sandwich and the wrapping, and prevent the sandwich from shaking during transport. This reduces the risk of the filling coming into contact with the wrapping film during transport, which could result in soiling the wrapping film and damaging its appearance.

[0008] Furthermore, conventional sandwich packaging methods do not completely maintain the hermeticity of the sandwiches during packaging. Therefore, it is impossible to eliminate the possibility of foreign matter such as dust or insects entering the sandwiches through gaps in the packaging after packaging. Therefore, in food packaging where prevention of foreign matter entry is particularly important, a packaging method that provides a tighter seal than conventional techniques is desirable.

[0009] Furthermore, in conventional sandwich packaging, the opening surface of the sandwich that can be manipulated and opened when eating the sandwich is only one of the surfaces that make up the triangular prism of the sandwich, which is not very convenient.

[0010] Furthermore, in conventional sandwich packaging, the joining surface (hereinafter referred to as the joint) of the packaging film of the packaging body that encases the sandwich is located at the cross-section of the ingredients, the rear or back surface of the sandwich, etc. Therefore, for example, when opening the sandwich, the joint of the packaging film becomes an obstacle, making it difficult to open. Therefore, a packaging form that is easier to open is desirable.

[0011] Furthermore, in conventional sandwich packaging, when the packaging body is preformed from the packaging film, excess material protrudes from the packaging body, so the conventional packaging form is not environmentally friendly, and a more environmentally friendly packaging form is desirable.

[0012] The present invention aims to solve the above problems. [Means for solving the problem]

[0013] The present invention is a method for packaging sandwiches using a packaging film, the method including packaging a sandwich having two right-angled triangular side surfaces, an ingredient cross-section portion along the hypotenuse of the side surfaces, a sandwich back surface portion along one of two sides forming a right angle on the side surfaces, and a sandwich bottom surface portion along the other of the two sides, wherein a joint portion is formed by joining edges of two opposing sides of the rectangular packaging film, and the method includes: forming a tubular film body having a square tubular shape with open ends, the tubular film body being formed by a first film surface portion where the joint portion is located, a second film surface portion opposite the first film surface portion, and a pair of opposing third film surface portions, the method including packaging the sandwich in a longitudinal middle portion along the joint portion inside the tubular film body, and wrapping one of the side surfaces along the first film surface portion; a second step of folding inward an excess portion of the tubular film body on the side of the sandwich bottom in the longitudinal direction relative to the sandwich, thereby sealing the sandwich, and a third step of folding inward an excess portion of the tubular film body on the side of the sandwich bottom in the longitudinal direction relative to the sandwich, wherein a tear-off tape stretched along the longitudinal direction is provided so as to be positioned on the other third film surface of the tubular film body, and in the second step, the excess portion is folded in so that the opening end of the tear-off tape is positioned at the back of the sandwich.

[0014] The present invention also provides a method for packaging sandwiches, in which a sandwich has two right-angled triangular side surfaces, an ingredient cross-section portion along the hypotenuse of the side surfaces, a sandwich back surface portion along one of two sides forming a right angle on the side surfaces, and a sandwich bottom surface portion along the other of the two sides, in which a tubular film body corresponding to the size of the sandwich is formed in advance by forming a joint portion by joining the edges of two opposing sides of the packaging film pulled from an assembly of sheet-like packaging films, and the tubular film body has a square cylindrical shape with both ends open or one end open, formed by a first film surface portion where the joint portion is located, a second film surface portion opposite the first film surface portion, and a pair of opposing third film surface portions, and the sandwich is placed inside the tubular film body at a longitudinal intermediate portion along the joint portion within the tubular film body, with one of the side surfaces along the first film surface portion, a second step of folding inward an excess portion of the tubular film body on the side of the back surface of the sandwich in the longitudinal direction relative to the sandwich to form a gripping portion and seal it; and a third step of folding inward an excess portion of the tubular film body on the side of the bottom surface of the sandwich in the longitudinal direction relative to the sandwich to seal it; wherein a tear-off tape stretched along the longitudinal direction is provided so as to be located on the other third film surface of the tubular film body, and in the second step, the excess portion is folded in so that the opening end of the tear-off tape is located on the back surface of the sandwich.

[0015] Furthermore, the present invention provides a method for packaging sandwiches as described in claim 1 or claim 2, characterized in that at least one of the second step and the third step includes a step of folding the first film surface portion and the second film surface portion of the packaging film covering the sandwich toward the inside of the tubular film body, with a center line formed along the longitudinal axis direction of the tubular film body as the tip, and abutting the tubular film against the bottom surface portion of the sandwich or the back surface portion of the sandwich.

[0016] Furthermore, the present invention provides a method for packaging sandwiches as described in claim 1 or claim 2, characterized in that at least one of the second step and the third step is carried out by pressing a rigid object against the back or bottom of the sandwich or moving a rigid object along the back or bottom of the sandwich to form upright portions with only both ends of the packaging film standing upright, folding the upright portions along the back or bottom of the sandwich, and sealing the sandwich with the packaging film.

[0017] The present invention also provides a packaging film for packaging sandwiches having an approximately triangular prism shape, wherein a pair of opposing end edges of the packaging film have a joint to be formed in the width range of approximately 5 mm to approximately 20 mm in the short direction at the end edges for joining the opposite edges after the sandwich is packaged, and further, on the other two opposite edges of the packaging film that are not the joint, a tear-off tape is provided connecting the opposite edges in an approximately straight line from one edge to the other, and a tear-off handle is provided in contact with the tear-off tape.

[0018] The present invention also relates to a sandwich packaging film as described in claim 5, characterized in that the printing space is arranged in advance on a portion of the packaging film so that the printing space is located on the back or bottom of the sandwich when the sandwich is packaged.

[0019] The present invention also provides a sandwich packaging film as described in claim 6, characterized in that when the packaged sandwich is placed with the bottom of the sandwich facing downwards, the opening handle is positioned at a height on the back of the sandwich that is at least half the height of the sandwich.

[0020] A package in which a sandwich is placed in a bag made of a heat-sealable transparent plastic film or a heat-sealable packaging film made of a base material made of paper and a thermoplastic synthetic resin layer, either printed with letters or patterns or plain, and the bag is then heat-sealed and closed, the end of a single sheet-like packaging film being folded to form a rectangular tubular film body, and the joint portion, which is the overlapping portion of the folded portion, is formed by bending the joint portion from the front end of the sandwich to extend over the back portion of the sandwich, the second triangular surface portion, and the bottom portion of the sandwich, and along the front end and rear end of the sandwich of the bag formed in front and behind the sandwich when the bag is bent. a folded portion formed by folding upward toward the inside of the sandwich at the sandwich back portion of the bag; a folded portion formed by folding upward toward the inside of the sandwich at the sandwich bottom portion of the bag; an opening trigger portion formed at the sandwich back portion at a height of at least half the sandwich height when the sandwich is held upright with the sandwich bottom portion at the bottom; and opening means that uses the opening trigger portion as a base and is provided from the opening trigger portion to the sandwich bottom portion and the sandwich back portion, and that can open the bag by detaching from the bag. A sandwich package comprising: [Effects of the Invention]

[0021] By implementing the present invention, the sealing of the sandwich after packaging can be improved, the shaking of the sandwich inside the packaging film during transport can be suppressed, and a sufficient opening surface for the sandwich can be ensured. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a plan view of a packaging film used as a packaging means for a sandwich according to one embodiment of the present invention. [Figure 2] 1 is a perspective view of a sandwich covered with a packaging film used as a sandwich packaging means according to one embodiment of the present invention. FIG. [Figure 3] FIG. 1 is a flow chart illustrating a sandwich packaging process according to one embodiment of the present invention. [Figure 4] 1 is a perspective view showing a state in the middle of packaging by a sandwich packaging means according to one embodiment of the present invention, in which a sandwich is embedded in a packaging film to form a tubular film body. FIG. [Figure 5] 1 is a perspective view showing a state in which the back surface of a sandwich is gusset-folded during packaging by a sandwich packaging means according to an embodiment of the present invention. FIG. [Figure 6] 1 is a perspective view of a sandwich according to an embodiment of the present invention, showing the back of the sandwich sealed during the packaging process. FIG. [Figure 7] 1 is a perspective view of the bottom of a sandwich during a packaging procedure for a sandwich according to an embodiment of the present invention, in which the packaging film is being folded over the bottom of the sandwich. FIG. [Figure 8] 1 is a perspective view of the bottom of a sandwich when the bottom of the sandwich is sealed during a packaging procedure for the sandwich according to one embodiment of the present invention; FIG. [Figure 9] 1 is a perspective view of the bottom of a sandwich when an excess portion of the packaging film on the bottom of the sandwich is folded and fixed in place during a procedure for packaging a sandwich according to one embodiment of the present invention. FIG. [Figure 10] 1 is a perspective view of a sandwich after packaging according to a sandwich packaging procedure according to one embodiment of the present invention, viewed from the cross-section side of the ingredients. FIG. [Figure 11] 1 is a perspective view of a sandwich packaged according to a sandwich packaging procedure according to one embodiment of the present invention, taken from the rear side of the sandwich when the sandwich is being opened. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention is a method for packaging sandwiches using a packaging film, the method including packaging a sandwich having two right-angled triangular side surfaces, an ingredient cross-section portion along the hypotenuse of the side surfaces, a sandwich back surface portion along one of two sides forming a right angle on the side surfaces, and a sandwich bottom surface portion along the other of the two sides, wherein a joint portion is formed by joining edges of two opposing sides of the rectangular packaging film, and the method includes: forming a tubular film body having a square tubular shape with open ends, the tubular film body being formed by a first film surface portion where the joint portion is located, a second film surface portion opposite the first film surface portion, and a pair of opposing third film surface portions, the method including packaging the sandwich in a longitudinal middle portion along the joint portion inside the tubular film body, and wrapping one of the side surfaces along the first film surface portion; a second step of folding inward an excess portion of the tubular film body on the side of the sandwich bottom in the longitudinal direction relative to the sandwich, thereby sealing the sandwich, and a third step of folding inward an excess portion of the tubular film body on the side of the sandwich bottom in the longitudinal direction relative to the sandwich, wherein a tear-off tape stretched along the longitudinal direction is provided so as to be positioned on the other third film surface of the tubular film body, and in the second step, the excess portion is folded in so that the opening end of the tear-off tape is positioned at the back of the sandwich.

[0024] Here, the side surface refers to the first triangular surface portion and the second triangular surface portion, and the excess packaging film portion refers to the grip portion, and the same area is expressed by different words.

[0025] In addition, the first surface refers to the surface of the packaging film corresponding to the cross-section of the ingredients in the sandwich, the second surface refers to the surface of the packaging film located on the back side of the sandwich, and the third surface refers to the surface of the packaging film located on the bottom side of the sandwich.

[0026] Furthermore, in the packaging means for the sandwich 2 according to one embodiment of the present invention, the two approximately triangular shaped surfaces that are the side surfaces of the approximately triangular prism-shaped sandwich are called and defined as the first triangular surface portion 3 and the second triangular surface portion 6, respectively.

[0027] Furthermore, in the sandwich packaging means according to one embodiment of the present invention, the surface of the approximately triangular prism-shaped sandwich from which the approximately rectangular sandwich filling is exposed is called and defined as filling cross-section portion 4 (Figure 11), which is a surface including the base of the triangle of triangular-shaped first surface portion 3 and the base of the triangle with triangular-shaped second surface portion 6 of the approximately triangular prism-shaped sandwich.

[0028] In addition, in a sandwich packaging means according to one embodiment of the present invention, the approximately rectangular surfaces of the approximately triangular prism-shaped sandwich, which include the hypotenuse 55 of the triangular first surface portion 3 and the triangular second surface portion 6, are called and defined as the sandwich back surface portion 22 and the sandwich bottom surface portion 23, respectively.

[0029] In addition, in the sandwich packaging means according to one embodiment of the present invention, the side portion of the approximately triangular prism-shaped sandwich 2 that is common to the sandwich back surface 22 and the sandwich bottom surface 23 is called and defined as the top portion 24 .

[0030] [1. Regarding the sandwich packaging film according to one embodiment of the present invention] First, the shape of the sandwich to be packaged and the packaging film for the sandwich according to one embodiment of the present invention will be described. Sandwich 2 according to one embodiment of the present invention is intended for a generally triangular sandwich, such as those commonly sold at convenience stores, etc. Note that the sandwich packaging method according to one embodiment of the present invention can package a sandwich even if it has a generally rectangular parallelepiped shape, although the sealing manner of the back surface of the sandwich and the rear surface of the sandwich will differ.

[0031] Furthermore, a packaging film 1 is used to package a sandwich according to one embodiment of the present invention, functioning as a package for packaging a sandwich 2. The material of the packaging film 1 is, for example, a polymeric organic compound including plastic. Specific examples include polymeric organic compounds such as polypropylene (PP), polyester (PET), nylon (PA), and polyethylene (PE). However, the packaging film 1 is not limited to polymeric organic compounds such as plastic, and may also be paper or the like.

[0032] As another example of preparation of the packaging film 1 before packaging, the packaging film 1 is cut into a substantially rectangular shape that is large enough to package one sandwich 2. In this case, a single sheet of packaging film 1 to be used may be pulled out from a roll film, which is a continuous bundle of rolls of packaging film 1, just before packaging the sandwich, and the packaging film may be cut to an appropriate length for use.

[0033] One embodiment of the packaging film 1 is shown in Fig. 1. As shown in Fig. 1, one embodiment of the packaging film 1 is a film-like packaging film 1 having a length of approximately 300 mm and a width of approximately 300 mm, which can appropriately package a typical-sized sandwich (the length of one side of the triangular surface that is not the base is approximately 150 mm).

[0034] The packaging film 1 has intended joining portions 36 at edge portions 35 that are two opposing sides (the two left and right sides in the figure) of the packaging film 1, where the edge portions 35 are welded and fastened together. The intended joining portions 36 are an area with a combined width of approximately 5 mm to 20 mm and a length on one side of the packaging film 1, and after the sandwich 2 is placed thereon, welding is carried out at these portions, allowing the sandwich 2 to be enclosed.

[0035] 1, a tear-open tape 29 is disposed near the left side of the packaging film 1, stretching from an upper edge 40 to a lower edge 41 of the packaging film. A purchaser of sandwich 2 can open sandwich 2 by pulling tear-open tape 29, which tears packaging film 1 as the tear-open tape 29 is pulled out.

[0036] Furthermore, on the tear tape 29 on the left side of the packaging film 1, a tear tape 17 having a tear handle 50 and a tear cut 51 is disposed so as to abut against the tear tape 29. The user first grasps the tear handle 50 with his / her fingers as a knob and pulls along the direction in which the tear tape 29 is disposed, whereby the packaging film 1 tears at the tear cut 51 provided in advance, and the package can be opened using the tear tape 29.

[0037] 1, tear tape 29 is provided on the left side of packaging film 1, but since tear tape 29 is provided on both sides of sandwich back surface 22 and sandwich bottom surface 23 of the packaged sandwich, the shape of packaging film 1 may be variously configured, and tear tape 29 may be provided on the right side of packaging film 1. Furthermore, although tear tape 17 is provided on the lower left side of FIG. 1, since tear tape 17 is disposed on the sandwich back surface or sandwich bottom surface 23 after packaging, the position of tear tape 17 may be variously configured.

[0038] Furthermore, although printing space 42 is provided near the approximate center of packaging film 1 in Figure 1, it may have various shapes in terms of size, frame shape, and arrangement, etc., as long as it fits properly on either side after sandwich 2 is packaged and the characters in printing space 42 can be properly viewed.

[0039] The names of ingredients of the product can be printed in advance in the printing space 42. Therefore, it is possible to omit the need to use labels such as stickers to indicate the ingredients.

[0040] Furthermore, the triangular prism-shaped sandwich 2 to be packaged is intended to be a sandwich having a triangular prism structure in which the triangular surface of the sandwich 2 is a roughly right-angled isosceles triangle. However, as long as the overall shape of the sandwich 2 is a triangular prism, the shape of the triangular surface of the sandwich 2 is not limited to a roughly right-angled isosceles triangle, and packaging can also be performed in the shape of, for example, an equilateral triangle.

[0041] 2. Sandwich packaging procedure according to one embodiment of the present invention Next, a procedure for packaging sandwiches according to one embodiment of the present invention will be described with reference to the flow chart of Figure 3. First, packaging film 1 is spread and arranged so as to be approximately parallel to a horizontal plane (step S1).

[0042] Then, sandwich 2 is placed on the unfolded packaging film 1 (step S2). At this time, sandwich 2 is placed with first triangular surface portions 3 of the two triangular surfaces of triangular prism-shaped sandwich 2 facing downward. For convenience, the triangular surface, which is the side surface of sandwich 2 that abuts approximately the center of packaging film 1, is referred to and defined as first triangular surface portion 3.

[0043] Regarding steps S1 and S2, the process of contacting the packaging film 1 with the sandwich 2 may be carried out in other ways that lead to the same results. That is, in another way, the packaging film 1 may be contacted from above by covering the vicinity of the center of the packaging film 1 with the triangular first surface portion 3 located on the top surface of the sandwich 2 (FIG. 2).

[0044] Then, packaging film 1 is folded to cover sandwich 2 (step S3). At this time, packaging film 1 is folded so as to abut along filling cross-sectional portion 4, top end 24, and triangular second surface portion 6 of sandwich 2. Therefore, when sandwich 2 is entirely covered with packaging film 1, packaging film 1 becomes a roughly quadrangular prism-shaped cylinder, with sandwich 2 embedded inside (FIG. 4). This roughly quadrangular prism-shaped cylinder will be referred to hereinafter as tubular film body 25.

[0045] Then, the to-be-joined portions 36, which are the covering portions of the edge portions 35 of the packaging film 1, are joined by the first triangular surface portion 3 of the sandwich 2, completing the tubular film body 25 (step S4). The to-be-joined portions 36 of the packaging film 1 are joined by, for example, thermal welding using heat. The to-be-joined portions 36 of the packaging film 1 then come into close contact with each other, forming the joint portion 7. Through the above process, the tubular film body 25 is completed.

[0046] The tubular film body 25 in which this sandwich 2 is embedded has a joint 7 and is composed of a first film surface portion 56 covering the second surface portion 6 of the triangular shaped surface, a second film surface portion 57 covering the first surface portion 3 of the triangular shaped surface, a third film surface portion 58 covering the top end portion 24, and a third film surface portion 58 covering the cross-sectional portion 4 of the ingredient.

[0047] Here, the joints 7 are welded by heat welding and therefore have sufficient adhesion, so there is almost no risk of foreign matter being mixed in through the joints 7. That is, when the tubular film body 25 is completed, only the spaces at the front and rear of the tubular film body 25 (the rear space 32 and the bottom space 33) are open, and the other parts are sealed off from the outside.

[0048] Next, packaging film 1 on sandwich back side 8 of sandwich 2 is adhered by gusset folding (FIG. 5, step S5). One example of the mechanism of gusset folding in step S5 is a mode in which first film surface portion 56 and second film surface portion 57 are folded, and the folding is performed toward the inside of tubular film body 25 so that the second film surface portion 57 of tubular film body 25 and the first film surface portion 56 of tubular film body 25 become parallel to the surface that constitutes ingredient cross-section portion 4 near the central axis parallel to the longitudinal direction of tubular film body 25, forming a fold. In other words, this folding mode is a gusset folding that folds to form a gusset portion.

[0049] Here, this gusset folding may be performed by, for example, pressing a flat, flat plate or the like with an appropriate force from above and below against the approximate centers of the first film surface portion 56 and the second film surface portion 57 of the tubular film body 25, which are the folding portions, to push the packaging film 1 toward the inside of the tubular film body 25. By using such an embodiment, it is possible to realize automation of the gusset folding using an automatic device.

[0050] Furthermore, this gusset folding may be performed in a manner in which pressing is performed by the flat plate or the like while the sandwich 2 is being transported during packaging.

[0051] Furthermore, the folding style of the packaging film 1 in step S5 is not limited to gusset folding, and may be other styles as long as the packaging film 1 can be tightly attached to the sandwich back side 8 of the sandwich 2, such as the folding style of the packaging film 1 described below.

[0052] Then, in step S5, a gusset fold is performed, thereby forming excess packaging film 28 at the leading end of sandwich bottom 23 (FIG. 6). A boundary 43 between excess packaging film 28 and sandwich 2 is then sealed by welding along the edge of sandwich 2, thereby completing the sealing of sandwich back 22 with packaging film 1 (step S6). The method for welding boundary 43 is, for example, thermal welding. Furthermore, the formed excess packaging film 28 can be marked with, for example, the mark of the manufacturer of sandwich 2 or the name of the sandwich 2 to be packaged.

[0053] In this way, excess packaging film portion 28 is heat-sealed, thereby sufficiently sealing sandwich back surface portion 22 of sandwich 2. This makes it possible to sufficiently reduce the risk of foreign matter being mixed into sandwich back surface side 8 of sandwich 2.

[0054] Next, sandwich 2, which has been placed with triangular first surface portion 3 at the bottom, is rotated approximately 90 degrees together with tubular film body 25, with the longitudinal direction of tubular film body 25 as the axis of rotation, so that ingredient cross-section portion 4 of sandwich 2 is at the bottom (step S7). After this rotation, sandwich 2 stands upright in a well-balanced manner, with ingredient cross-section portion 4 on the bottom and top end 24 as the apex. Step S7 is provided for the purpose of facilitating the subsequent work process, and step S7 may be omitted.

[0055] Next, first film surface portion 56, which will come into contact with sandwich bottom side 9 of sandwich 2, is folded to fit closely to sandwich bottom portion 23. One example of how packaging film 1 is folded around sandwich bottom side 9 is to first slide a rigid object such as a plate downward along sandwich bottom portion 23 of sandwich 2 from top end 24 of sandwich 2, thereby pressing packaging film 1 and bringing packaging film 1 into close contact with the entire sandwich bottom portion 23 of sandwich 2 ( FIG. 7 ). At this time, the rigid object is prevented from contacting two edge portions 35 of the sides shared by sandwich bottom portion 23 of sandwich 2 and triangular first surface portion 3 and triangular second surface portion 6. In other words, the width of the rigid object such as a plate is set slightly shorter than the length of top end 24 of sandwich 2. The folding step of step S7, like the gusset folding described above, may be automated using automatic equipment by moving a solid object such as a plate or by moving sandwich 2 along a solid object such as a plate.

[0056] Then, after step S7, only the packaging film near the two edge portions 35 of the sandwich bottom portion 23 of the sandwich 2 is not in close contact with the sandwich bottom portion 23, but stands upright as a protruding upright portion spaced apart from the sandwich bottom portion 23 (hereinafter referred to as packaging film upright portion 10).

[0057] Next, the two upright portions 10 of the packaging film are folded toward the sandwich bottom portion 23 of the sandwich 2. At this time, the two edge portions 35 are used as starting points and folded toward the sandwich bottom portion 23 at approximately 90 degrees.

[0058] As with sandwich bottom portion 23, when packaging film upright portion 10 is folded, packaging film excess portion 28 is formed at the rear end. Boundary portion 43, which is the boundary between packaging film excess portion 28 and sandwich 2, is also welded along the edge of sandwich 2 as described above (FIG. 8, step S9). Such welding is achieved by, for example, thermal welding. Therefore, packaging film 1 adequately seals sandwich 2 even on sandwich bottom side 9.

[0059] The folding of the sandwich bottom portion 23 in steps S8 and S9 may be performed in the gusset-like manner described above.

[0060] Then, in step S9 described above, sandwich 2 is completely sealed within packaging film 1. At this point, sandwich 2 is wrapped by heat sealing boundary 43 between two excess packaging film portions 28, and the other portions are wrapped within packaging film 1. This provides sufficient sealing, greatly reducing the possibility of foreign matter entering packaging film 1.

[0061] Then, excess packaging film portion 28 formed in step S9 is folded toward sandwich bottom portion 23 of sandwich 2, so that the entire excess packaging film portion 28 is aligned along sandwich bottom portion 23 of sandwich 2 (FIG. 9). After excess packaging film portion 28 is folded, excess packaging film portion 28 is fixed in place while aligned along sandwich bottom portion 23 using a fastening material such as adhesive tape 34. Through this process, packaging of sandwich 2 is completed (step S10).

[0062] After the above steps have been taken to complete the packaging of sandwich 2, tear tape 29 is provided along approximately the center line of sandwich back portion 22 and sandwich bottom portion 23 after packaging (FIG. 9). Therefore, the user can open sandwich back portion 22 and sandwich bottom portion 23 along tear tape 29, and easily remove sandwich 2 from inside packaging film 1.

[0063] The sandwich package packaged through the above steps has the form shown in FIG. 9 or 10, and includes a bag 59, a joint portion 7 provided across the sandwich back portion 22, the triangular second surface portion 6, and the sandwich bottom portion 23, two portions, a front seal portion 12 and a rear seal portion 11 formed by heat welding the front and rear ends of the sandwich 2 to the packaging film 1, two excess portions 28 of the packaging film formed near the front and rear ends of the sandwich, and the sandwich back portion 22. a folded portion formed by folding inward at the sandwich bottom portion 23 toward the bag interior, a folded portion formed by folding inward at the sandwich bottom portion 23 toward the bag interior, an opening tape 17 serving as an opening trigger portion formed on the sandwich back portion 22 at a height equal to or more than half the height of the sandwich when the sandwich 2 is stood upright with the sandwich bottom portion 23 at the bottom, and an opening tape 29 serving as opening means provided across the sandwich bottom portion 23 and the sandwich back portion 22.

[0064] Furthermore, after sandwich 2 has been packaged, printing space 42 is located on sandwich back surface 22. Therefore, by displaying packaged sandwich 2 on a shelf with sandwich bottom surface 23 facing downward, ingredient cross-section portion 4 facing outward, and sandwich back surface 22 facing backward, there is no risk of the printing space becoming soiled.

[0065] Furthermore, in the packaged sandwich 2, the joint 7 is provided over part of the sandwich back surface 22, the triangular second surface 6, and part of the sandwich bottom surface 23 (FIGS. 9 to 11). This makes it possible to provide an opening surface for the tear tape 29 over both the sandwich back surface 22 and the sandwich bottom surface 23.

[0066] [2. Effects of the sandwich packaging method according to one embodiment of the present invention] Next, the effects of the sandwich packaging method according to one embodiment of the present invention will be described.

[0067] According to the sandwich packaging method of one embodiment of the present invention, it is possible to seal at three locations: rear seal portion 11, front seal portion 12, and joint portion 7. Therefore, it is possible to ensure a sufficient seal for sandwich 2 compared to conventional sandwich 2 packaging methods, and to sufficiently prevent foreign objects such as insects from getting inside the sandwich 2.

[0068] Furthermore, according to the packaging method for sandwich 2 according to one embodiment of the present invention, sandwich 2 is covered with packaging film 1 during packaging, which minimizes the gap between sandwich 2 and packaging film 1. As a result, sandwich 2 is less likely to shake within packaging film 1 during transportation, reducing the risk of ingredients adhering to packaging film 1 or ingredient cross-section portion 4, making it difficult to see the contents. This reduces the risk of a loss in commercial value.

[0069] Furthermore, according to a sandwich packaging method according to one embodiment of the present invention, the opening The wrapping film 1 is disposed on the front and rear sides of the sandwich 2, providing ample opening space, making it easy to remove the sandwich 2 from inside the wrapping film 1 and providing excellent convenience.

[0070] Furthermore, according to the method for packaging sandwiches 2 according to one embodiment of the present invention, when packaging sandwiches 2 using automated equipment, it is possible to move sandwiches 2 and packaging bags made of packaging film 1 at the same speed. In other words, sandwiches 2 can be transported while being wrapped, which increases the processing speed of the packaging process.

[0071] Furthermore, according to the packaging method for sandwich 2 according to one embodiment of the present invention, tear tape 29 and the shape of the notch are distinctive, making opening easy. In this respect, this embodiment is excellent in convenience.

[0072] Furthermore, in the packaging means for sandwich 2 according to one embodiment of the present invention, in a process prior to packaging sandwich 2, ingredient covering material 5 may be applied to ingredient cross-section portion 4 of sandwich 2 in order to maintain the product's appearance. Here, the material for ingredient covering material 5 may be the same as that of packaging film 1, for example, a plastic film such as nylon. When covering with ingredient covering material 5, the covering may be done manually by a human being, or the covering may be automated using a machine.

[0073] Furthermore, the covering mode with the ingredient covering material 5 described above may be, for example, a mode in which the ingredient cross-section portion 4 of the sandwich 2 is covered with the ingredient covering material 5 in advance, and then the sandwich 2 is wrapped in the wrapping film 1.

[0074] Furthermore, when the packaging means for the sandwich 2 according to one embodiment of the present invention is automated, for example using an automatic driving machine, it is also possible to pre-print the rolled film and then cut it to the size of one sandwich for use.

[0075] Furthermore, when the sandwich packaging means according to one embodiment of the present invention is automated, the packaging film 1 may be folded in advance to form a tubular film body 25, and then the sandwich 2 may be embedded in the tubular film body 25. Even in this case, the sandwich 2 can be packed tightly because the packaging body is not formed in a perfect triangular prism shape in advance.

[0076] In the above-described embodiment, the production of sandwich 2 and the molding of tubular film body 25 from packaging film 1 can be carried out simultaneously in parallel, which is expected to reduce the time required on the production line.

[0077] Furthermore, as described above, in the packaging means for sandwich 2 according to one embodiment of the present invention, ingredients and the like can be printed in advance in printing space 42 of packaging film 1. This eliminates the need to attach a separate label, saving time and effort, and is an embodiment that is highly convenient and environmentally friendly, leading to a reduction in the waste of resources.

[0078] Furthermore, the shape of the label serving as the opening handle of the packaging means for sandwich 2 according to one embodiment of the present invention may be in various forms. Specifically, it may be, for example, arc-shaped or angular.

[0079] Furthermore, the shape of the cut edge of the opening handle portion 50 of the packaging film 1 used in the sandwich packaging means according to one embodiment of the present invention may be various, as long as it is a shape that can trigger the opening of the packaging film 1 in the vertical direction. Specifically, a semicircular cut edge, a triangular cut edge, a rectangular cut edge, or the like is a flexible cut edge.

[0080] Furthermore, with regard to the height position of opening handle 50 used in the sandwich packaging means according to one embodiment of the present invention, when sandwich 2 is placed with sandwich bottom 23 facing downwards, opening handle 50 is provided at a position at least half the height and width of sandwich 2. In this manner, when packaging film 1 is opened, sandwich back 22 and sandwich bottom 23 can be opened over a wide range.

[0081] Furthermore, the sandwich opening mode of the sandwich packaging method according to one embodiment of the present invention may be other modes. Specifically, the width of the tear tape may be approximately 80% or more of the width of the back of the sandwich (the length of the top end 24), allowing for wide-area opening. In such a mode, the opening means for the sandwich 2 can open wide areas of the bottom 23 and back 22 of the sandwich, providing excellent convenience for the user.

[0082] Furthermore, in the sandwich packaging method according to one embodiment of the present invention, the packaging film may be a packaging film that has been pre-formed into a rectangular shape, or a length corresponding to the size of one sandwich may be pulled out from a collection of roll films, such as a film roll of packaging film, and tubular film body 25 may be pre-formed to fit the size of the sandwich, after which the sandwich is inserted and sealed. In this case, the packaging film may be cut before tubular film body 25 is formed and the sandwich is sealed, or after tubular film body 25 has been formed and the sandwich is sealed.

[0083] After the sandwich is sealed, one end of the cylindrical film body 25 is cut, and then the second step is carried out.

[0084] In this manner, the time required for packaging the sandwiches can be reduced, and a large number of sandwiches 2 can be packaged in a short period of time.

[0085] The above-described content is not limited to the present embodiment. It goes without saying that any other inventions that are considered to be of the same nature, such as minor modifications, are within the same technical scope as the present invention. [Explanation of symbols]

[0086] 1. Packaging film 2. Sandwiches 3 Triangular shaped surface first surface part (side surface) 4. Cross section of ingredients (first side) 5. Ingredients covering material 6 Triangular surface second surface (side surface) 7 Joint 8 Back side of sandwich 9 Bottom side of sandwich 10 Packaging film upright part 11 Rear seal 12 Front seal 17. Tear tape 22 Sandwich back (second side) 23 Sandwich bottom (third side) 24 Apex 25 Cylindrical film body 28 Excess packaging film (gripping part) 29 Tear tape 32 Rear space 33 Bottom side space 34 adhesive tape 35 Edge 40 Upper edge of packaging film 41 Bottom edge of packaging film 42 printing space 50 Opening handle 51 Opening cutout 55 Hypotenuse 56 First film surface 57 Second film surface 58 Third film surface 59 bags

Claims

1. A method for packaging a sandwich, the method comprising packaging a sandwich in a packaging film, the sandwich having two right-angled triangular side surfaces, an ingredient cross-section portion along the hypotenuse of the side surfaces, a sandwich back surface portion along one of two sides that form a right angle on the side surfaces, and a sandwich bottom surface portion along the other of the two sides, a first step of forming a joint by joining two opposing edge portions of the rectangular packaging film together to form a tubular film body having a square tubular shape with both ends open, with a first film surface portion where the joint is located, a second film surface portion opposite the first film surface portion, and a pair of opposing third film surface portions, and then positioning the sandwich in a longitudinal middle portion along the joint within the tubular film body, with one of the side surfaces aligned with the first film surface portion and the ingredient cross-section portion aligned with one of the third film surface portions; a second step of folding inward an excess portion of the tubular film body on the sandwich back surface side in the longitudinal direction relative to the sandwich to form a gripping portion and seal the excess portion; a third step of folding inward and sealing an excess portion of the tubular film body on the sandwich bottom side in the longitudinal direction relative to the sandwich, a tear-off tape stretched along the longitudinal direction is provided so as to be positioned on the other third film surface portion of the tubular film body; In the second step, the excess portion is folded in such a way that the tear end of the tear tape is positioned at the back surface of the sandwich. A method for packaging sandwiches.

2. A method for packaging a sandwich, the method comprising packaging a sandwich in a packaging film, the sandwich having two right-angled triangular side surfaces, an ingredient cross-section portion along the hypotenuse of the side surfaces, a sandwich back surface portion along one of two sides that form a right angle on the side surfaces, and a sandwich bottom surface portion along the other of the two sides, A tubular film body is formed in advance to match the size of the sandwich by forming a joint by joining the edges of two opposing sides of the packaging film pulled from an assembly of sheet-like packaging films, and the tubular film body has a square tubular shape with both ends open or one end open, with a first film surface portion where the joint is located, a second film surface portion opposite the first film surface portion, and a pair of third film surface portions opposite each other. The sandwich is positioned in a longitudinal middle portion inside the tubular film body along the joint, with one of the side surfaces aligned with the first film surface portion and the ingredient cross-section portion aligned with one of the third film surface portions; The first step is to cut the packaging film along a plane perpendicular to the first film surface portion, the second film surface portion, and the third film surface portion before the second step is started. a first step characterized by a second step of folding inward an excess portion of the tubular film body on the sandwich back surface side in the longitudinal direction relative to the sandwich to form a gripping portion and seal the excess portion; a third step of folding inward and sealing an excess portion of the tubular film body on the sandwich bottom side in the longitudinal direction relative to the sandwich, a tear-off tape stretched along the longitudinal direction is provided so as to be positioned on the other third film surface portion of the tubular film body; In the second step, the excess portion is folded in such a way that the tear end of the tear tape is positioned at the back surface of the sandwich. A method for packaging sandwiches.

3. At least one of the second step and the third step is In the first film surface portion and the second film surface portion of the packaging film covering the sandwich, 3. A method for packaging sandwiches as described in claim 1 or claim 2, characterized in that it includes a step of folding the tubular film body toward the inside of the tubular film body, using a center line formed along the longitudinal direction of the tubular film body as the tip, and abutting the tubular film against the bottom surface or the back surface of the sandwich.

4. At least one of the second step and the third step is The method is characterized by being carried out by the steps of pressing a rigid object against the back or bottom of the sandwich or moving a rigid object along the back or bottom of the sandwich to form upright portions with only both ends of the packaging film standing upright, folding the upright portions along the back or bottom of the sandwich, and sealing the sandwich with the packaging film. A method for packaging a sandwich according to claim 1 or claim 2.

5. A packaging film for packaging a sandwich having a substantially triangular prism shape, At a pair of opposing edge portions of the packaging film, a joining portion for joining the opposite side portions after packaging the sandwich, the joining portion being provided on the end side portion with a width in the range of approximately 5 mm to approximately 20 mm in the short direction; Further, on two sides constituting the other opposite sides other than the intended joining portion of the packaging film, a tear-off tape is arranged so as to be connected in a substantially linear manner from one side of the opposite sides to the other side, The present invention is also characterized in that an opening handle is provided in contact with the opening tape. Sandwich wrapping film.

6. When the sandwich is packaged, the printing space is positioned on the back or bottom of the sandwich. The printing space is provided in advance on a part of the packaging film. characterized in that 6. A packaging film for a sandwich according to claim 5.

7. The opening handle is located at a height of at least half the height of the sandwich on the back surface of the sandwich when the sandwich is placed with the bottom surface of the sandwich facing downwards after packaging. characterized by:

7. The sandwich packaging film of claim 6.

8. A package in which a sandwich is placed in a bag made of a heat-sealable transparent plastic film or a heat-sealable packaging film made of a base material made of paper and a thermoplastic synthetic resin layer, which may be plain or printed with letters or patterns, and which is then heat-sealed and closed, The edges of a single sheet-like packaging film are folded together to form a rectangular cylindrical film body, and the joined portion, which is the overlapping portion of the folded portion, is bent from the front end of the sandwich to cover the back surface of the sandwich, the second triangular surface portion, and the bottom surface of the sandwich, and is formed along the sandwich. a seal portion formed by heat welding along the front end and the rear end of the sandwich at the front and rear ends of the sandwich when the bag is bent; an excess portion of packaging film formed at the front end and the rear end of the sandwich of the bag; a folded portion formed by folding the sandwich back portion of the bag upward toward the inside of the bag; a folded portion formed by folding the sandwich bottom portion of the bag toward the inside of the bag; When the sandwich is held upright with the bottom surface of the sandwich facing downwards, an opening trigger is formed on the back surface of the sandwich at a height equal to or greater than half the height of the sandwich; an opening means that is provided with the opening trigger portion as a base, extending from the opening trigger portion to the bottom surface portion of the sandwich and the back surface portion of the sandwich, and that is capable of opening the bag by being detached from the bag; A sandwich package comprising:

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