Food packaging

Abstract

To provide a food package, a packaging sheet, and a food packaging bag with a new form including a contamination prevention sheet for preventing the packaging sheet from being contaminated with food coming in contact with an inner surface of the packaging sheet.SOLUTION: In a food package 1, food F which has side faces in a triangular shape and has a predetermined width is packaged with a packaging sheet 2. The packaging sheet 2 includes an opening piece 7 formed by forming a notch line 6 at a part corresponding to a front face Ff of the food F and a contamination prevention sheet 8 coming in tight contact with the front face Ff of the food F to cover the notch line 6 and the opening piece 7 from an inner face side of the packaging sheet 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to food packaging On the body Regarding. [Background technology]

[0002] There are foods such as sandwiches that have triangular (usually right-angled) sides and are finished into a three-dimensional shape with a certain width. A food packaging bag for packaging such foods is made by overlapping a pair of packaging sheets consisting of a front sheet and a back sheet, each of which has a shape in which one end is wider than the other end, and has a bag body that is sealed on three sides by the top joint at one end and the side joints at both sides, and the other end is an opening.

[0003] This type of food packaging bag is provided with a stain-prevention sheet on the inner surface of the front sheet (for example, Patent Document 1). The stain-prevention sheet has, for example, the other end joined to the inner surface of the front sheet at two points by point seals or the like, and one end is a free end. As a result, in a food package in which food is packaged in a food packaging bag, the stain-prevention sheet adheres closely to the front (slope) of the food, and follows the movement of the food inside. Therefore, in the food package, the front sheet does not become stained and the appearance is not impaired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-168816 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention relates to a novel food packaging method, comprising: providing a stain-preventing sheet that prevents food from coming into contact with the inner surface of the packaging sheet and staining the packaging sheet; Body The objective of the present invention is to provide [Means for solving the problem]

[0006] The food packaging body according to the present invention comprises: A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet is A tear strip is provided which is formed by forming a cut line in a portion corresponding to either the upper or lower part of the front surface of the food, and which forms an opening in the portion corresponding to the front surface of the food by pulling the tear strip toward the other portion corresponding to either the upper or lower part of the front surface of the food, A stain-prevention sheet is provided in a portion corresponding to the front of the food, which is in close contact with the front of the food and covers the area where the cut line, the opening strip and the opening are formed from the inner side of the packaging sheet. 、 The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. It is a food package.

[0007] Here, as one embodiment of the food packaging body according to the present invention, The stain-prevention sheet is joined to the inner surface of the packaging sheet by a frame-shaped joint that surrounds the cut line and the tear strip. The above configuration can be adopted.

[0008] In addition, a food packaging body according to another aspect of the present invention is A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet should be placed on the front of the food. A tear strip formed by forming a cut line; a stain-prevention sheet that is in close contact with the front of the food and covers the cut line and the opening strip from the inner side of the packaging sheet; The packaging sheet used is a long packaging sheet roll in which cut lines and opening strips are formed at a fixed pitch in the longitudinal direction of the sheet roll, and a stain prevention sheet is arranged on the inner surface of the sheet roll so as to cover the cut lines and opening strips at one end and along the longitudinal direction of the sheet roll, and each stain prevention sheet is joined to the inner surface of the sheet roll by a frame-shaped joint that surrounds the cut lines and opening strips. 、 The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. It is a food package. Furthermore, a food packaging body according to another aspect of the present invention is A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet should be placed on the front of the food. A tear strip formed by forming a cut line; a stain-prevention sheet that is in close contact with the front of the food and covers the cut line and the opening strip from the inner side of the packaging sheet; The packaging sheet used is a long packaging sheet original, in which cut lines and opening strips are formed at a fixed pitch in the longitudinal direction of the sheet original, a long original of a stain-prevention sheet is placed on the inner surface of the sheet original so as to cover each of the cut lines and opening strips and to follow the longitudinal direction of the sheet original, and the stain-prevention sheet original is joined to the inner surface of the sheet original by a frame-shaped joint that surrounds each of the cut lines and opening strips. 、 The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. It is a food package.

[0009] In addition, as one embodiment of the food packaging body according to the present invention, The packaging sheet further includes a pair of second cut lines extending outwardly to the left and right from predetermined positions of the cut lines. The configuration can be adopted. 。 Effect of the Invention

[0010] According to the present invention, a novel food packaging method is provided that includes a stain-preventing sheet that prevents food from coming into contact with the inner surface of the packaging sheet and staining the packaging sheet. Body Provided. [Brief description of the drawings]

[0011] [Figure 1] Fig. 1(a) is a perspective view of a food package in which food is packaged with a packaging sheet according to the first embodiment, as seen from the front side, and Fig. 1(b) is a perspective view of the food package, as seen from the rear side. [Diagram 2] FIG. 2 is an explanatory diagram of the manufacturing process of the raw material packaging sheet, and is an explanatory diagram of the process of attaching an opening strip to the inner surface of the raw material sheet and the process of forming a cut line. [Diagram 3] FIG. 3 is a continuation of FIG. 2 and is an explanatory diagram illustrating a step of arranging a stain-prevention sheet on the inner surface of the original sheet and a step of joining the stain-prevention sheet to the original sheet. [Figure 4] FIG. 4 is an explanatory diagram of the manufacturing process for the food package, specifically, the process of placing food on the inner surface of the raw packaging sheet. [Diagram 5] FIG. 5 is a continuation of FIG. 4 and is an explanatory diagram of a process of joining overlapping portions on both sides of a cylindrical raw packaging sheet. [Figure 6] FIG. 6 is a continuation of FIG. 5 and illustrates the steps of folding the floating sheet, joining the raw packaging sheet between the foods, and separating the food packages into individual pieces. [Figure 7] Fig. 7(a) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a first modified example, and Fig. 7(b) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a second modified example. [Figure 8] Fig. 8(a) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a third modified example, and Fig. 8(b) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a fourth modified example. [Figure 9]Fig. 9(a) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a fifth modified example, and Fig. 9(b) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a sixth modified example. [Figure 10] Fig. 10(a) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to a seventh modified example, and Fig. 10(b) is a perspective view from the front side of a food package in which food is packaged with a packaging sheet according to an eighth modified example. [Figure 11] FIG. 11 is an explanatory diagram of a manufacturing process of a raw packaging sheet which becomes the packaging sheet according to the ninth modified example. [Figure 12] FIG. 12 is an exploded perspective view of the food packaging bag according to the second embodiment. [Figure 13] FIG. 13 is a front view of a packaging bag for food. [Figure 14] Fig. 14(a) is a perspective view of a food package in which food is packaged in a food packaging bag, as seen from the front side, and Fig. 14(b) is a perspective view of the food package, as seen from the rear side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First Embodiment Hereinafter, as a first embodiment of the present invention, a packaging sheet for packaging a sandwich and a food package in which a sandwich is packaged with this packaging sheet will be described with reference to Figs. 1 to 6.

[0013] As shown in Figure 1, food package 1 comprises a sandwich F packaged in a packaging sheet 2. The packaging sheet 2 has a rectangular shape (rectangular shape) large enough to encase the sandwich F. The packaging sheet 2 is a plastic sheet (plastic film) having thermal adhesive properties, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0014] The sandwich F has a three-dimensional shape with a side Fs in the shape of a right triangle having a certain width, and has a slanted front surface Ff, left and right side surfaces Fs, Fs, a back surface Fr, and a bottom surface Fb. The packaging sheet 2 is formed into a cylindrical shape so that the widthwise center of the packaging sheet 2 overlaps the front surface Ff of the sandwich F, and the overlapping portions of both sides of the packaging sheet 2 overlapped in a palm-shaped manner are joined (vertical joint 3), and the portions of the packaging sheet 2 that are raised above the sandwich F are folded and the flattened upper and lower ends are joined along the width direction (horizontal joint 4), thereby maintaining the food package 1 in an airtight state. Therefore, outside air does not enter the inside, and the packaged sandwich F maintains the intended quality.

[0015] The vertical joint 3 is disposed on the back surface Fr and the bottom surface Fb of the sandwich F along a direction perpendicular to the width direction (hereinafter referred to as the "width-perpendicular direction"). One of the two horizontal joints 4 is spaced apart from the intersection line between the front surface Ff and the back surface Fr of the sandwich F by a predetermined distance in the width-perpendicular direction and formed along the width direction. The other horizontal joint (not shown) is spaced apart from the intersection line between the front surface Ff and the bottom surface Fb of the sandwich F by a predetermined distance in the width-perpendicular direction and formed parallel to the one horizontal joint 4 along the width direction, and disposed along the width direction on the bottom surface Fb of the sandwich F. In this embodiment, the vertical joint 3 and the two horizontal joints 4 are formed by welding using a heating roller or a heating bar, and are strip-shaped seals having a predetermined width.

[0016] The packaging sheet 2 has an opening strip 5 on its inner surface. The opening strip 5 is provided along the width-orthogonal direction from one end to the other end of the packaging sheet 2 in the width-orthogonal direction. As a result, the opening strip 5 is disposed along the width-orthogonal direction on the front surface Ff of the sandwich F. The opening strip 5 is joined to the inner surface of the packaging sheet 2 by welding, adhesion, or the like. The opening strip 5 is, for example, a cutting tape or thread that has the strength to break the packaging sheet 2.

[0017] A cut line 6 is formed in a portion of the packaging sheet 2 corresponding to the lower portion of the front surface Ff of the sandwich F. The cut line 6 is formed by a full cut line, a half cut line (half cut), a perforation, or the like. In this portion, the cut line 6 forms an opening piece 7. The cut line 6 is formed so as to divide the opening strip 5. The opening piece 7 has the cut line 6 as an outline line, a fixed end between both end points, and a free end on the opposite side. In this embodiment, the cut line 6 is formed in an inverted U-shape. As a result, the opening piece 7 becomes an upward tongue piece.

[0018] The packaging sheet 2 is provided with a stain-prevention sheet 8 on its inner surface. The stain-prevention sheet 8 is a sheet having a portion that is joined to the packaging sheet 2 and another portion that is not joined to the packaging sheet 2, and has a portion that is capable of moving relative to the packaging sheet 2. As a result, the stain-prevention sheet 8 adheres closely to the front Ff of the sandwich F, and even if the sandwich F moves inside, it follows the movement and prevents the sandwich F (ingredients, sauce, etc.) from coming into contact with the inner surface of the packaging sheet 2 and causing the packaging sheet 2 to become stained.

[0019] The stain prevention sheet 8 has a rectangular shape (rectangular shape) with a size corresponding to the front face Ff of the sandwich F. Specifically, the stain prevention sheet 8 has a rectangular shape (rectangular shape) that is the same as or slightly smaller than the front face Ff of the sandwich F. However, the cause of the stain is not the bread of the sandwich F, but mainly the ingredients and sauces sandwiched between the bread. Therefore, it is sufficient that the stain prevention sheet 8 has a shape or size that covers at least these areas. Like the packaging sheet 2, the stain prevention sheet 8 is a plastic sheet (plastic film) having thermal adhesion properties, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0020] A joint 9 is used as a means for joining a part of the stain-prevention sheet 8 to the packaging sheet 2. The joint 9 is formed by joining the packaging sheet 2 and the stain-prevention sheet 8 in a frame shape so as to surround the cut line 6 and the opening flap 7. In this embodiment, the joint 9 is a strip-shaped or linear seal having a predetermined width, formed by welding using a heating tool having a frame-shaped heating surface. If the packaging sheet 2 and the stain-prevention sheet 8 are made of materials that cannot be directly welded to each other, they can be welded by applying a coating agent (part coating agent) such as a heat-sensitive adhesive to the inner surface of the corresponding part of the packaging sheet 2 or the outer surface of the corresponding part of the stain-prevention sheet 8. The joint 9 may be formed by other joining methods such as adhesion.

[0021] The joint 9 will not peel off with a small force, but can be peeled off when a person applies a certain amount of force. That is, the packaging sheet 2 and the stain-prevention sheet 8 are joined in a peelable manner. When the above-mentioned coating agent is used, the bonding strength (heat seal strength) of the coating agent is not strong, so the joint 9 is weakly bonded (weakly sealed).

[0022] The joint 9 is formed at the lower end of the stain-prevention sheet 8 (the portion of the stain-prevention sheet 8 corresponding to the lower part of the front surface Ff of the sandwich F) due to the relationship between the positions of the cut line 6 and the tear strip 7. For example, the joint 9 is formed in a region selected from a region within 40%, a region within 35%, a region within 30%, or a region within 20% of the total length of the stain-prevention sheet 8 from the lower end of the stain-prevention sheet 8. As a result, the lower end side of the stain-prevention sheet 8 is the joint end and the upper end side is the free end.

[0023] From the viewpoint of mass production, this type of food package 1 is continuously manufactured in the form of pillow packaging by a pillow packaging machine using a long raw packaging sheet. Next, a method for manufacturing the raw packaging sheet and the food package 1 will be described.

[0024] The manufacturing process of the packaging sheet raw material includes: i) a step (first step) of attaching an opening strip 5 to the inner surface of the sheet raw material 2X along the longitudinal direction of the sheet raw material 2X as shown in FIG. 2; ii) a step (second step) of forming cut lines 6 at a fixed pitch along the longitudinal direction of the sheet raw material 2X on the opening strip 5 as shown in FIG. 2; more specifically, a step (second step) of forming the cut lines 6 in the sheet raw material 2X and forming an opening strip 7 by forming the cut lines 6; iii) a step (third step) of arranging the stain-prevention sheet 8 on the inner surface of the sheet raw material 2X so that the ends of the stain-prevention sheet 8 cover the cut lines 6 and the opening strip 7 as shown in FIG. 3; and iv) a step (fourth step) of joining the stain-prevention sheet 8 to the inner surface of the sheet raw material 2X by joining the sheet raw material 2X and the stain-prevention sheet 8 in a frame shape surrounding the cut lines 6 and the opening strip 7 as shown in FIG. 3, i.e., a step of forming a joint 9.

[0025] In the first step, the sheet raw material 2X is continuously transported, and the opening strip 5 is unwound from a roll and fed to the sheet raw material 2X. Then, a pressing mechanism (not shown) arranged on the transport path of the sheet raw material 2X operates in synchronization with the transport of the sheet raw material 2X, so that the opening strip 5 is attached to the inner surface of the sheet raw material 2X.

[0026] In the second step, the sheet raw material 2X is transported continuously or intermittently. Then, a slit mechanism (not shown) arranged on the transport path of the sheet raw material 2X operates in synchronization with the transport of the sheet raw material 2X, so that the slit lines 6 are formed at the corresponding locations of the sheet raw material 2X. The slit lines 6 are formed so that the fixed end side faces the downstream side in the transport direction and the free end side faces the upstream side in the transport direction. This prevents the opening strip 7 from being turned up and folded during the transport process of the sheet raw material 2X, or the sheet raw material 2X from being torn at the slit lines 6. The pitch at which the slit lines 6 are formed is the pitch at which the sandwiches F are arranged at a predetermined interval in the transport direction in the process of arranging the sandwiches F described later.

[0027] In the third step, the sheet roll 2X is transported continuously or intermittently, and a stain-preventing sheet roll (not shown) is unwound from a roll and fed to the sheet roll 2X. A cutting and transporting mechanism (not shown) arranged on the transport path of the sheet roll 2X operates in synchronization with the transport of the sheet roll 2X, whereby the stain-preventing sheet 8 is cut from the stain-preventing sheet roll, transported, and disposed at a corresponding location on the inner surface of the sheet roll 2X. The stain-preventing sheet 8 is disposed so that the joint end faces the downstream side in the transport direction and the free end faces the upstream side in the transport direction. This prevents the stain-preventing sheet 8 from being turned up and folded during the transport of the sheet roll 2X.

[0028] In the fourth step, the sheet material 2X is transported continuously or intermittently. A joining mechanism (not shown) arranged on the transport path of the sheet material 2X operates in synchronization with the transport of the sheet material 2X, so that the stain prevention sheet 8 is joined to the corresponding portion of the sheet material 2X.

[0029] Through these steps, the packaging sheet raw material 2X is completed. After being wound into a roll, the roll is set in a pillow packaging machine, or the packaging sheet raw material 2X is manufactured by a pillow packaging machine and continues to be transported to the manufacturing process of the food package 1.

[0030] The manufacturing process of the food package 1 includes: i) a step (first step) of arranging sandwiches F on the inner surface of an original packaging sheet 2X at a fixed pitch along the longitudinal direction of the original packaging sheet 2X as shown in FIG. 4; ii) a step (second step) of rolling up the original packaging sheet 2X to encase the sandwiches F into a cylindrical shape and overlapping both side portions of the original packaging sheet 2X as shown in FIG. 5; iii) a step (third step) of joining the overlapped portions of both side portions of the original packaging sheet 2X as shown in FIG. 5, i.e., forming vertical joints 3; and iv) a step (third step) of appropriately joining sheets that are separated from the surface of the sandwich F as shown in FIG. The method includes the steps of: appropriately folding the original packaging sheet 2X so that it fits along the surface of the sandwich F (fourth step); v) joining the flattened original packaging sheet 2X between the sandwiches F, F along the width direction, as shown in Figure 6, i.e., forming the horizontal joints 4 (fifth step); vi) cutting the horizontal joints 4 along the midpoints and separating the food packages 1 from one another, as shown in Figure 6 (sixth step); and vii) (as an optional additional step), folding the protruding sheet pieces protruding from the bottom surface of the food package 1 so that they fit along the bottom surface of the food package 1 and attaching a label L thereon, as shown in Figure 6 (seventh step).

[0031] In the first step, the packaging sheet original roll 2X is transported continuously or intermittently. A transport mechanism (not shown) arranged on the transport path of the packaging sheet original roll 2X operates in synchronization with the transport of the packaging sheet original roll 2X, and the sandwiches F are transported and arranged at corresponding locations on the inner surface of the packaging sheet original roll 2X. Specifically, the sandwiches F are arranged so that the bottom surface Fb faces downstream in the transport direction and the front surface Ff of the inclined surface overlaps the stain prevention sheet 8. In addition, since the stain prevention sheets 8 are arranged at a predetermined interval in the transport direction, the sandwiches F are arranged at a predetermined interval in the transport direction.

[0032] The second and third steps are the same as the center sealing step performed in general pillow packaging. Through the second and third steps, the original packaging sheet 2X is shaped into a rectangular tube that encloses the sandwich F so as to fit along the side faces Fs, Fs of the sandwich F and along the intersection line between the back face Fr and the bottom face Fb of the sandwich F.

[0033] In the fourth step, the original packaging sheet 2X is transported continuously or intermittently. A folding mechanism (not shown), such as a former, arranged on the transport path of the original packaging sheet 2X, operates in synchronization with the transport of the original packaging sheet 2X, so that the sheets floating away from the surface of the sandwich F are folded so as to fit the back surface Fr and the bottom surface Fb of the sandwich F.

[0034] The fifth and sixth steps are the same as the end sealing step and separation step (cutting off step) performed in typical pillow packaging. After the fifth step, the original packaging sheet 2X folded flat between the sandwiches F, F is joined in a belt shape along the width direction. This completes a continuous body of food packages 1. Furthermore, after the sixth step, the food packages 1 are cut off from the continuous body of food packages 1.

[0035] Through these steps, the food package 1 is completed. As shown in FIG. 1, the completed food package 1 has an opening portion extending from the lower front to the bottom. When eating the sandwich F, the opening strip 7 is picked up and pulled down toward the bottom of the food package 1. The cut end of the opening strip 5 is joined to the opening strip 7. Therefore, when the opening strip 7 is picked up and pulled down, the packaging sheet 2 is cut by the opening strip 5, and an opening is formed on the bottom of the food package 1. The sandwich F can be taken out from this opening. In the packaging sheet 2, the direction perpendicular to the width coincides with the longitudinal direction of the packaging sheet roll 2X. That is, the packaging sheet 2 has a tearing directionality (straight-line cutting property) in the direction perpendicular to the width. Therefore, the packaging sheet 2 is cut straight along the opening strip 5 as the opening strip 5 is pulled.

[0036] As described above, in the food package 1 and packaging sheet 2 according to this embodiment, the stain prevention sheet 8 has both a function of preventing the sandwich F from coming into contact with the inner surface of the packaging sheet 2 and staining the packaging sheet 2, and a function as a sealant that prevents outside air, foreign matter, etc. from entering the inside through the cut line 6 by covering the opening starting point (the cut line 6 and the opening piece 7) from the inner surface side of the packaging sheet 2. In addition, the joint portion 9 has both a function of ensuring the effect of preventing the intrusion of foreign matter, etc., by surrounding the opening starting point (the cut line 6 and the opening piece 7) and a function of joining a part of the stain prevention sheet 8 to the packaging sheet 2. This makes it possible to reduce the number of parts and the manufacturing man-hours.

[0037] <Modification of the first embodiment> Next, modified examples of the first embodiment will be described. Note that the following modified examples are merely examples. It goes without saying that these elemental technologies can be employed in the first embodiment alone or in appropriate combination.

[0038] FIG. 7(a) shows the first modified example. In the first modified example, the cut line 6 is formed in a U-shape in the portion of the packaging sheet 2 corresponding to the lower portion of the front surface Ff of the sandwich F, and the opening strip 7 is a downward tongue strip. When eating the sandwich F, the opening strip 7 is picked up and pulled up toward the upper end of the food package 1. When the opening strip 7 is picked up and pulled up, the packaging sheet 2 is cut by the opening strip 5, and an opening is formed in the front surface of the food package 1. The sandwich F can be taken out from this opening. If the stain-prevention sheet 8 gets in the way when taking out the sandwich F, the stain-prevention sheet 8 can be pulled out from the opening to eliminate the state in which the stain-prevention sheet 8 blocks the opening (hereinafter the same). Alternatively, the stain-prevention sheet 8 can be used as a sheet to prevent hand stains by grabbing the sandwich F through the stain-prevention sheet 8 and taking it out (hereinafter the same).

[0039] FIG. 7(b) shows a second modified example. In the second modified example, the cut line 6 is formed in an inverted U-shape in a portion of the packaging sheet 2 corresponding to the upper portion of the front surface Ff of the sandwich F, and the opening strip 7 is an upward tongue strip. For example, the joint portion 9 is formed in a region selected from a region within 40%, a region within 35%, a region within 30%, or a region within 20% of the total length of the stain-prevention sheet 8 from the upper end of the stain-prevention sheet 8. As a result, the upper end side of the stain-prevention sheet 8 is the joint end, and the lower end side is the free end. When eating the sandwich F, the opening strip 7 is picked up and pulled down toward the bottom surface of the food package 1. When the opening strip 7 is picked up and pulled down, the packaging sheet 2 is cut by the opening strip 5, and an opening is formed at the front surface of the food package 1 (or at the bottom surface of the food package 1 if pulled down further). The sandwich F can be taken out from this opening.

[0040] FIG. 8(a) shows a third modified example. In the third modified example, a pair of second cut lines 6a, 6a are added to the cut line 6 of the first modified example. The second cut line 6a is a cut line having a component toward the outside in the width direction of the packaging sheet 2. The second cut line 6a is a straight or curved cut line that extends diagonally downward from a predetermined portion of the cut line 6 along a direction inclined with respect to the width direction of the packaging sheet 2. Alternatively, the second cut line 6a may be a straight or curved cut line that extends from a predetermined portion of the cut line 6 toward the outside in the width direction of the packaging sheet 2 along the width direction of the packaging sheet 2. Therefore, when the left and right sheets on the front side of the food package 1 are opened to the left and right as the second stage opening operation, the packaging sheet 2 is torn outward in the width direction starting from the second cut line 6a, and a larger opening is formed on the front side of the food package 1. This improves the ease of removal of the sandwich F.

[0041] 8(b) shows a fourth modified example. In the fourth modified example, similar second cut lines 6a, 6a are added to the cut line 6 of the second modified example. The second cut line 6a is a straight or curved cut line extending obliquely upward from a predetermined position of the cut line 6 along a direction inclined with respect to the width direction of the packaging sheet 2. Alternatively, the second cut line 6a may be a straight or curved cut line extending from a predetermined position of the cut line 6 along the width direction of the packaging sheet 2 outward in the width direction of the packaging sheet 2.

[0042] A fifth modified example is shown in Fig. 9(a), and a sixth modified example is shown in Fig. 9(b). The fifth modified example is the first embodiment in which the opening strip 5 is not provided, and the sixth modified example is the second modified example in which the opening strip 5 is not provided. As described above, the packaging sheet 2 has tear directionality (straight-line cutting property) in the direction perpendicular to the width. Therefore, the packaging sheet 2 can be properly opened even without providing the opening strip 5.

[0043] FIG. 10(a) shows the seventh modified example, and FIG. 10(b) shows the eighth modified example. The seventh modified example is the first embodiment in which the frame-shaped joint 9 surrounding the cut line 6 and the tear strip 7 is not provided, and the eighth modified example is the second modified example in which the frame-shaped joint 9 surrounding the cut line 6 and the tear strip 7 is not provided. A joint 10 is used as a means for joining a part of the stain-prevention sheet 8 to the packaging sheet 2. The horizontal joint 4 is spaced at a predetermined interval in the width direction from the intersection line between the front Ff and back Fr of the sandwich F, and a flat internal space sandwiched by the film is present between them. In this example, the upper end of the stain-prevention sheet 8 enters this internal space, and the joint 10 is formed at the upper end of the stain-prevention sheet 8. Note that the upper end of the stain-prevention sheet 8 extends to the horizontal joint 4, so that the horizontal joint 4 serves as a means for joining a part of the stain-prevention sheet 8 to the packaging sheet 2.

[0044] FIG. 11 shows a ninth modified example. In the ninth modified example, a continuous stain-prevention sheet roll 8X is used instead of the stain-prevention sheet 8 cut individually. In the third step of the manufacturing process of the packaging sheet roll 2X, the sheet roll 2X is continuously transported, and the stain-prevention sheet roll 8X is unwound from a roll and supplied to the sheet roll 2X. Then, a pressing mechanism (not shown) arranged on the transport path of the sheet roll 2X is operated, so that the stain-prevention sheet roll 8X is arranged on the inner surface of the sheet roll 2X. In the ninth modified example, the horizontal joint 4 serves as a means for joining a part of the stain-prevention sheet 8 to the packaging sheet 2, and therefore the fourth step (the step of forming the joint 9) of the manufacturing process of the packaging sheet roll 2X is unnecessary. However, the joint 9 may be formed in order to ensure the effect of preventing the intrusion of foreign matter and the like.

[0045] The tenth modification (not shown) differs in the manufacturing process of the food package 1. That is, in the tenth modification, the manufacturing process of the food package 1 includes: i) a step (first step) of arranging sandwiches F on the inner surface of the original packaging sheet 2X along the longitudinal direction of the original packaging sheet 2X at a fixed pitch as shown in Fig. 4; ii) a step (second step) of rolling up the original packaging sheet 2X so as to encase the sandwiches F into a cylindrical shape and overlapping both side portions of the original packaging sheet 2X as shown in Fig. 5; iii) a step (third step) of joining the overlapping portions of both side portions of the original packaging sheet 2X as shown in Fig. 5, i.e., a step of forming a vertical joint 3; and iv) a step (third step) of joining the sandwiches F, F between the sandwiches F, F. The tenth modification includes a fourth step of cutting the raw packaging sheet 2X into a cylindrical shape and separating the raw packaging sheet 2X into individual packaging sheets 2 each containing a sandwich F, a fifth step of folding the sheets that are floating away from the surface of the sandwich F, and aligning them with the surface of the sandwich F, a sixth step of joining both ends of the folded flat packaging sheet 2 along the width direction, that is, forming the horizontal joints 4, and a seventh step of (optional and additional step) cutting and cutting off the protruding sheet pieces beyond the horizontal joints 4. In the tenth modification, one of the two horizontal joints 4, 4 can be formed adjacent to the intersection line between the front face Ff and the back face Fr of the sandwich F, and the other horizontal joint 4 can be formed adjacent to the intersection line between the front face Ff and the bottom face Fb of the sandwich F.

[0046] <Second embodiment> Next, as a second embodiment of the present invention, a food packaging bag for packaging a sandwich and a food package in which a sandwich is packaged in this food packaging bag will be described with reference to Figs. 12 to 14.

[0047] As shown in Figures 12 and 13, the food packaging bag 11 includes a bag body 12 and a header portion 16. The bag body 12 is formed by overlapping and joining a pair of packaging sheets (a front sheet 2A and a back sheet 2B). The pair of packaging sheets 2A, 2B have a shape in which one end is wider than the other end in the direction perpendicular to the width. The bag body 12 is joined and sealed on three sides by a top joint portion 13 at one end and side joint portions 14, 14 at both sides, and the other end becomes an opening portion 15. The header portion 16 is formed by joining the protruding pieces of the packaging sheets 2A, 2B protruding from the top joint portion 13 to each other at appropriate locations and integrating them.

[0048] The front sheet 2A and the back sheet 2B are made of the same material as the packaging sheet 2 of the first embodiment. The front sheet 2A has a body portion 20A and a tip portion 21A (the above-mentioned protruding piece). The back sheet 2B has a body portion 20B and a tip portion 21B (the above-mentioned protruding piece). The body portions 20A, 20B have a shape that gradually becomes wider from one end side to the other end side. The tip portions 21A, 21B have a narrow shape extending from one end of the body portions 20A, 20B.

[0049] The top joint 13 is formed by welding the front sheet 2A and the back sheet 2B along one end of the body portions 20A, 20B. The side joint 14 is formed by welding the side edges (oblique sides) of the body portions 20A, 20B and the side edges (vertical sides) of the tip portions 21A, 21B. In this embodiment, the top joint 13 is a band-shaped seal having a predetermined width, formed by welding using a heating bar. The side joint 14 is a linear seal formed by melt cutting.

[0050] The inside of the bag body 12 constructed in this manner serves as a food storage area. A cut line 6 and an opening strip 7 are formed on the front sheet 2A of the bag body 12. In this embodiment, the cut line 6 and the opening strip 7 are formed near the top joint 13. The cut line 6 and the opening strip 7 are the same as those in the first embodiment, and other descriptions are omitted.

[0051] The front sheet 2A has an opening strip 5 on its inner surface. The opening strip 5 is provided along the width direction from the opening piece 7 to the other end of the front sheet 2A. The opening strip 5 is the same as that in the first embodiment, and other descriptions are omitted.

[0052] The front sheet 2A has on its inner surface a stain-resistant sheet 8. The stain-resistant sheet 8 and the joining portion 9 as means for joining a part of the stain-resistant sheet 8 to the front sheet 2A are similar to those in the first embodiment, and other descriptions will be omitted.

[0053] When packaging food, the opening 15 is opened, the sandwich F is inserted into the bag body 12, and then the excess sheet piece at the opening 15 (the sheet piece protruding from the bottom surface Fb of the sandwich F) is folded appropriately to close the opening 15, and a label or tape is applied thereon to seal the opening 15. In this way, the food package 1 is completed as shown in FIG. 14. The food package 1 is maintained in an airtight state by the top joint 13, the side joints 14, 14, and the closed part of the sealed opening 15. Therefore, outside air does not enter the inside, and the packaged sandwich F maintains the expected quality. The food package 1 is the same as that of the first embodiment, and other descriptions are omitted.

[0054] As described above, the food packaging bag 11 and food package 1 according to this embodiment also provide the same advantageous effects as those provided by the packaging sheet 2 and food package 1 according to the first embodiment.

[0055] It goes without saying that the component technologies of the first embodiment and the component technologies of each of the variations of the first embodiment can be adopted alone or in appropriate combination in this embodiment, so long as they are physically applicable to this embodiment.

[0056] <Other embodiments> The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0057] In the above embodiment, the opening strip 5, the cut line 6, the opening strip 7, and the joint 9 are provided at the center in the width direction. However, the present invention is not limited to this. These may be provided at a position shifted to the left or right.

[0058] In the above embodiment, the food is a sandwich. However, the food to be packaged may be Western confectionery such as cake, Japanese confectionery such as castella, bread, rice processed food such as rice balls, etc., as long as it has a shape similar to that of a sandwich, and the type of food is not particularly limited.

[0059] In addition, the sheets (including stain-prevention sheets) used for packaging sheets and food packaging bags are not limited to those made of plastic sheets (plastic films). For example, the sheets may be paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, paper-like or paper-like sheets (films) or sheets (films) mainly made of these (collectively referred to as "paper sheets" (films"). The paper sheets have heat-welding properties on the inner surface as necessary, either entirely or partially at required locations. For example, the paper sheets are laminated sheets (films) in which paper is used as the outer layer and a plastic sheet (film) is used as the inner layer. The sheets may be laminated sheets (laminated films) in which sheets (films) of multiple materials are laminated, rather than sheets (films) made of a single material. The sheets may be formed into a single sheet using multiple sheets (films), such as sheets made by joining the ends of two sheets (films) together to form a single sheet, or sheets made by joining the ends of three sheets (films) together in sequence to form a single sheet. In this case, the materials of the sheets may be different. For example, some of the sheets may be paper sheets instead of plastic sheets (plastic films). In the present invention, the sheet is not defined by the thickness, but is a concept including a film.

[0060] In addition, in the present invention, terms that specify a shape, part, or state, such as "triangular," "right-angled triangular," "rectangular," "rectangular," "straight line," "center," "middle," "end," "side," "coincident," "same," "parallel," and "orthogonal," not only include the term itself, but also include the concept of "approximately" in the sense of being close to or similar to it. [Explanation of symbols]

[0061] 1...food packaging body, 2...packaging sheet, 2A...front sheet, 2B...back sheet, 2X...packaging sheet roll (sheet roll), 20A, 20B...body, 21A, 21B...tip, 3...vertical joint (center seal), 4...horizontal joint (end seal), 5...opening strip, 6...slit line, 6a...second slit line, 7...opening strip, 8...stain prevention sheet, 8X...stain prevention sheet roll, 9...joint, 10...joint, 11...food packaging bag, 12...bag body, 13...top joint, 14...side joint, 15...opening, 16...header, F...sandwich, Ff...front, Fs...side, Fr...back, Fb...bottom, L...label

Claims

1. A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet is A tear strip is provided which is formed by forming a cut line in a portion corresponding to either the upper or lower part of the front surface of the food, and which forms an opening in the portion corresponding to the front surface of the food by pulling the tear strip toward the other portion corresponding to either the upper or lower part of the front surface of the food, a stain-preventing sheet is provided in a portion corresponding to the front surface of the food, the stain-preventing sheet being in close contact with the front surface of the food and covering the formation area of ​​the cut line, the tear strip and the opening portion from the inner surface side of the packaging sheet; The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. Food packaging.

2. The stain-prevention sheet is joined to the inner surface of the packaging sheet by a frame-shaped joint that surrounds the cut line and the tear strip. The food package of claim 1.

3. A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet should be placed on the front of the food. A tear strip formed by forming a cut line; a stain-prevention sheet that is in close contact with the front of the food and covers the cut line and the opening strip from the inner side of the packaging sheet; The packaging sheet used is a single sheet cut from a long packaging sheet roll, in which cut lines and opening strips are formed at a fixed pitch in the longitudinal direction of the sheet roll, and stain prevention sheets are arranged on the inner surface of the sheet roll so as to cover the cut lines and opening strips at one end and along the longitudinal direction of the sheet roll for each cut line and opening strip, and each stain prevention sheet is joined to the inner surface of the sheet roll by a frame-shaped joint that surrounds the cut lines and opening strip. The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. Food packaging.

4. A food package in which a single packaging sheet is folded to enclose a food product having triangular sides and a predetermined width, The packaging sheet should be placed on the front of the food. A tear strip formed by forming a cut line; a stain-prevention sheet that is in close contact with the front of the food and covers the cut line and the opening strip from the inner side of the packaging sheet; The packaging sheet used is a long packaging sheet original, in which cut lines and opening strips are formed at a fixed pitch in the longitudinal direction of the sheet original, a long original of a stain-prevention sheet is disposed on the inner surface of the sheet original so as to cover each of the cut lines and opening strips and to run along the longitudinal direction of the sheet original, and the stain-prevention sheet original is joined to the inner surface of the sheet original by a frame-shaped joint surrounding each of the cut lines and opening strips, and one sheet is cut from the long original of the packaging sheet. The cut line and the tear strip are formed in the portion of the packaging sheet that corresponds to the front of the food, at a position shifted to the left or right from the center in the width direction. Food packaging.

5. The packaging sheet further includes a pair of second cut lines extending outwardly to the left and right from predetermined positions of the cut lines. The food packaging product according to any one of claims 1 to 4.

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