JP2016016888A - Food packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food packaging bag enabling a user to simply and accurately package a food having a plane triangle shape and a constant thickness, such as cheese and cake, and open smoothly and neatly without causing shape collapse or projection.SOLUTION: A food packaging bag includes: a body film part 1 formed in a shape allowing the whole from tapered inclined both side surfaces to the bottom face of a food having a plane triangle shape and a constant thickness to be covered; and a gusset film part 2 for covering the triangular top face of the food by heat-sealing both side end edges of the body film part 1 along the inclined top edge sharp corner parts in both side surfaces of the food so as to tear off both side end edges. The tip of the gusset film part 2 is projected from the tip of the heat-sealed part where both side end edges are integrally connected so as to form an opening piece 9 to tear off the gusset film part 2 from the body film part 1.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a food packaging bag suitable for packaging foods such as cheese and cake having a certain thickness in a plane triangle shape.

  Conventionally, as described in Patent Document 1 and Patent Document 2, for example, as a packaging bag for food, for example, a sandwich bag, the upper and lower end portions are overlapped with an isosceles trapezoidal shape and have a small interval from the upper side. By heat-sealing the part where the horizontal width is equal to the thickness of the sandwich in the horizontal direction over the entire width, and heat-sealing the inclined sides on both sides from both ends of the horizontal heat-sealed part to both ends of the bottom The food storage part which the bottom side opened between the opposing inner surfaces of a front and back film is formed, and also in patent document 1, the heat fusion part of the both sides sloping sides is provided to both ends of the upper side, and the horizontal The upper ends of the front and back films protruding from the heat-sealing portion are made inseparable from each other, and two parallel cuts from the upper end toward the horizontal heat-sealing are provided at the center portion in the width direction of the front-side upper end portion. Forming a film portion between cuts of the opening piece (tensile specimens) Te.

  On the other hand, in Patent Document 2, the upper and lower films protruding from the horizontal heat-sealed portion can be separated from each other without providing the heat-sealed portions between the two inclined pieces on the front and back films at both ends of the upper side. It is formed into an open piece (a pick piece).

  The packaging bag configured in this way inserts the sandwich into the food storage part from the opening end provided on the bottom side, and places the front and back films in the vertical direction along the center of the width direction of the front film on the inclined surface of the sandwich Then, after the sandwich is accommodated until the tip of the sandwich reaches the horizontal heat-sealed portion, it is sealed by the front and back film portions on the bottom side. Further, when opening the packaging bag, the opening piece is pulled while being pulled toward the bottom side, and the center portion in the width direction of the front film covering the inclined surface of the sandwich is cut into a band shape. An opening corresponding to the width of the piece is provided.

Japanese Utility Model Publication No. 7-8238 JP 2005-8237 A

  However, according to the former packaging bag, since the opening piece is provided in the center portion in the width direction of the end portion protruding from the front end of the sandwich in the front film covering the inclined surface of the sandwich, Only the central part in the width direction of the inclined surface of the sandwich is exposed to the outside. When taking out the sandwich, the surface film must be spread in the thickness direction of the sandwich, which is cumbersome and the sandwich is crushed when it is expanded There is a problem that the shape is lost.

  In addition, when opening is started by rolling up the opening piece, the opening width is gradually narrowed even if the opening is blocked by the horizontal fusing part or exceeds the horizontal fusing part, so that the opening may not be possible. Therefore, a narrow cut tape is adhered to the surface film portion to be opened over the entire length, and the above cuts for forming the open pieces along both sides of one end of the cut tape are provided. It is necessary to provide it.

  On the other hand, according to the latter packaging bag, the width of the opening piece is formed so as to be substantially equal to the width of the inclined surface of the sandwich corresponding to the thickness of the sandwich, so that the surface covering the inclined surface of the sandwich is covered. Although the film portion can be removed by the opening piece to expose the inclined surface of the sandwich, the packaging bag made of the front and back films has the opening side as the upper side as described above. It is formed in the shape of an isosceles trapezoid, and the front film covers the part from the inclined surface with a constant thickness in the sandwich to the upper half of both parallel sides of the sandwich. The inclined sides on both sides of the film which are heat-sealed with each other are in a state in which the center part of both sides of the sandwich is covered over the entire length of the sandwich.

  Therefore, when opening with the opening piece that is connected to both ends of the both sides inclined, the surface film portion connected to the opening piece is peeled off from the inclined surface of the sandwich with a uniform peeling force in the vertical direction. Therefore, the surface film part covering both sides of the sandwich must be opened by peeling along the both sides of the sandwich in parallel. A force occurs in which the front film portion covering one side surface presses toward the other side surface of the sandwich, and the pressing force causes the sandwich to collapse. In addition, if the open piece is peeled off vigorously, the sandwich will jump out of the packaging bag, and there will be a problem that it becomes impossible to eat.

  The present invention has been made in view of such problems, and the object of the present invention is simple and accurate packaging of foods such as cheeses and cakes having a certain thickness in a plane triangle shape, An object of the present invention is to provide a food packaging bag that can be opened smoothly and cleanly without causing popping out.

  In order to achieve the above object, the food packaging bag according to the present invention is, as described in claim 1, a width of a film having a width capable of covering the bottom surface from both side surfaces of a food having a flat triangular shape and a certain thickness. The main body film part folded in two downwards from the center of the direction, and the main body film part is folded into the main body film part from the upper edge on both sides of the main body film part, and the lower end fold is above the lower end fold line of the main body film part The upper end fold line is formed by connecting the upper end edges on both sides of the main body film portion and the gusset film portion integrally with each other. The upper end from the end of the upper end fold to the end of the main body film part and the gusset film part is provided at a fixed length part from the base end to the center part with one end side of the edge as the base end The slits are removed by cutting obliquely downward together with the main body film portion to the vicinity of the front end portion of the gusset film portion, and the cut edge portions are thermally bonded to the upper end edges on both sides of the gusset film portion and the main body film portion. Is formed on both sides inclined heat-sealed portions so as to be peelable, and further, the both sides of the two-side inclined heat-sealed portions from the lower inclined end to the lower end fold of the main body film portion are folded on both sides. It is heat-sealed so as to be connected to the inclined heat-sealed portion at a right angle to form a vertically inclined heat-welded portion, and a fold-set front end portion of the gusset film portion protruding from the front end of the both-side inclined heat-welded portion. It is characterized by being formed on an opening piece.

  In the food packaging bag configured as described above, the invention according to claim 2 is characterized in that the food is provided by the base portion of the main body film portion continuously provided through the upper end fold and the base portion of the gusset film portion folded into the base portion. It is formed in the sealing part which folds and seals after it accommodates.

  Furthermore, the invention according to claim 3 is the same as the upper surface of the planar triangular shape of the food to be accommodated in the planar shape surrounded by the both sides inclined heat fusion portion when the gusset film portion folded in the main body film portion is developed. It is characterized by being formed in the same shape.

  According to a fourth aspect of the present invention, there is provided a horizontal cutting edge parallel to the lower fold of the gusset film portion from the lower inclined end of the inclined cutting edge portion provided with the both side inclined heat fusion portions toward the tip of the gusset film portion. And a bifurcated tip between the horizontal cutting edge and the lower fold of the gusset film portion is formed on the opening piece, and the lower inclined end of the both side inclined heat fusion portion is formed on the gusset film portion. It is provided until it reaches the tip of the lower end fold, and the base end of the unsealed piece is connected to the downwardly inclined end of the both-side inclined heat fusion portion.

  According to the first aspect of the present invention, the food packaging bag is formed of a film having a width that can cover the bottom surface from both side surfaces of a food product that is a flat triangle shape and has a certain thickness. The folded main film part is folded into the main film part from the upper edge of both sides of the main film part, and the lower end fold is arranged parallel to the lower end crease above the main film part with a certain distance therebetween. When the food is stored in the packaging bag while the gusset film portion is unfolded, the main body film portion covers the bottom surface from both sides of the food, and the gusset film portion covers the top surface of the food. It can be set as the accommodation form which coat | covered.

  Furthermore, the upper end crease in which the upper end edges on both sides of the main body film part and the gusset film part are integrally connected is a fixed length part from one end side of both upper end edges to the center part from the base end. The upper end crease extending from the tip of the upper end fold to the tip of the main body film portion and the gusset film portion is removed by cutting obliquely downward together with the main body film portion to the vicinity of the front end of the gusset film portion. The cut edge portion is formed into a two-sided inclined heat-sealed portion in which the upper end edges on both sides of the gusset film portion and the main body film portion are integrated so as to be able to be peeled off by heat fusion. From the lower inclined end of the fusion part to the lower end crease, the two-fold front end part of the main body film part is heat-sealed so as to be perpendicular to the both-side inclined thermal fusion part to form a longitudinally inclined thermal fusion part. Therefore, when a food having a certain thickness in a plane triangle is accommodated, the front end of the food comes into contact with the longitudinally inclined heat-sealed portion, and the both-side inclined heat-welded portion is inclined on both sides on the upper surface of the food. The food can be packaged easily and accurately along the line.

  In addition, since the bi-folded tip of the gusset film projecting from the tip of the both-side inclined heat-sealed part is formed on the opening piece, this packaging bag is folded in a folded state before food packaging. In addition, since the opening piece is folded into the front end portions of the main body film portion that is folded in half, there is no risk that the opening piece will be accidentally crushed, and a stable form as a food packaging bag is maintained. In addition, in the state where the food is packaged in the packaging bag, the unfolded piece is unfolded so that the fold is in the center in the width direction and is refracted slightly downward. A slight gap is created between the opening piece and the tip of the main body film portion that overlaps the lower surface of the opening piece, and the opening piece can be easily rolled up together with the rigidity of the opening piece due to the central fold, Opening operation Since it is easy and at least the central part including the crease at the base end of the opening piece is continuous with the downwardly inclined end, which is the tip of the side inclined heat fusion part, over the entire width, both sides inclined heat fusion from the opening piece Transmission of the opening operation force to the tip of the landing portion is smoothly and reliably performed, so that the opening can be quickly and cleanly performed.

  Further, since the base end of the opening piece is connected to the tip of the both-side inclined heat fusion portion between the main body film portion and the gusset film portion, the rolled-up opening piece is directed toward the both-side inclined heat fusion portion side. By moving it, it is possible to smoothly peel off the inclined heat-sealed parts on both sides upward from the upper side edges of the food without breaking the opened pieces, breaking the food or popping out of the bag Only the gusset film part which coat | covers the upper surface of a foodstuff can be peeled in the state which hold | maintained the whole foodstuff in the main body film part, without producing such a situation. And if the lower surface of the main body film part which coat | covers the bottom face of foodstuffs is pushed up, foodstuffs can be taken out easily from the inside of a main body film part.

  According to the invention which concerns on Claim 2, it folds after food is accommodated by the base part of the main body film part currently arranged through the said upper end fold, and the base part of the gusset film part folded in in this base part Since it forms in the sealing part to seal, the rear surface of the food accommodated in the bag can be coat | covered and sealed by this sealing part, and a foodstuff can be packaged in a sealed state.

  Furthermore, according to the invention which concerns on Claim 3, the plane shape enclosed by the both-sides inclination heat-fusion part at the time of expand | deploying the gusset film part folded in the main body film part is the plane triangular upper surface of the foodstuff to accommodate Since the gusset film part surrounded by the two-side inclined heat fusion parts can be packaged in a state where the upper surface of the food is covered completely and completely, as described above When the gusset film part is removed by peeling the both sides inclined heat fusion part with the opening piece, only the upper surface of the food can be exposed while the whole food is held in the main body film part, and the food is deformed. It can be opened neatly without any problems.

  According to the invention according to claim 4, the horizontal parallel to the lower end fold of the gusset film portion from the lower inclined end of the inclined cutting edge portion provided with the both sides inclined heat fusion portion toward the tip of the gusset film portion A cutting edge is provided, and a bi-folded tip between the horizontal cutting edge and the lower end fold of the gusset film is formed on the opening piece, and the lower inclined end of the both-side inclined heat-sealed portion is the gusset film. Since the base end of the opening piece is connected to the lower inclined end of the both-side inclined heat fusion part, the opening piece is placed on both sides in a state where food is packaged. A flat rectangular shape having a fixed width projecting in a horizontal direction from the lower inclined end of the inclined heat fusion part, and at least the central part of the base end of the unsealed piece as described above, the lower inclined end of the both side inclined heat fusion part In a continuous packaging form Unsealing operation by the opening piece can be carried out smoothly and reliably.

The side view of this invention food packaging bag. The front view. The perspective view of the state which spaced apart the both-sides inclination heat-fusion part slightly. The perspective view which shows the state which expanded the bag when accommodating foodstuffs. The perspective view which shows the packaged state. The perspective view which shows the state which removed the part longitudinally. The perspective view which shows an opening start state. The perspective view of the state which has started opening. The perspective view which shows the state opened. The perspective view of the cylindrical film for packaging bag formation for demonstrating a manufacturing method. The front view which shows the state which formed the gusset film part. The side view. The side view which shows the state which formed the packaging bag.

  A specific embodiment of the present invention will be described with reference to the drawings. A packaging bag A for packaging a food B such as cheese or cake having a certain thickness in a plane triangle, which packaging bag A is shown in FIGS. As shown, it comprises a main body film portion 1 that covers both sides of the food B from the bottom surface and a gusset film portion 2 that covers the upper surface of the food B, and the main body film portion 1 has a central portion in the width direction. The two film portions 1a and 1a are extended upward from the crease 3 so that the opposing surfaces thereof are overlapped with each other with the crease 3 at the lower end.

  On the other hand, the gusset film portion 2 is formed in a V-shape in the main body film portion 1 by integrally connecting the upper end edges of the two side film portions 2a and 2a to the upper end edges of the two side film portions 1a and 1a of the main body film portion 1. It is folded in a folded state. The width of the gusset film portion 2 before folding in half is smaller than the width of the main body film portion 1 before folding in half. The both sides extending in parallel with the lower end crease 3 of the portions 1a, 1a with a certain distance upward and extending upward from the lower end crease 4 so that their opposing surfaces overlap each other. An upper end fold line 5 is formed by folding back the upper end edge of the film portions 2a, 2a and the upper end edge of the main body film portion 1 connected to the upper end edge of the main body film portion 1 into an inverted V shape. The gusset film portion 2 is folded into the main body film portion 1 through the upper end fold line 5 as described above.

  The main body film portion 1 and the gusset film portion 2 are made of a laminate film formed by laminating a heat-sealable sealant layer on a base film layer. It is provided on the opposite surface side of the both-side film portions 1a, 1a formed by folding, and in the gusset film portion 2, on the outer surface side of the both-side film portions 2a, 2a facing the inner surfaces of the both-side film portions 1a, 1a of the main body film portion 1. Provided.

  Furthermore, in the upper end crease 5 in which the upper end edge of the main body film portion 1 and the upper end edge of the gusset film portion 2 are connected in series, one end side in the length direction of the main body film portion 1 and the gusset film portion 2 is the base end. Then, the distal end of the gusset film portion 2 that is folded into the main body film portion 1 from the distal end of the upper end fold line 5 while leaving only a fixed length of the base portion of the upper end fold line 5 that extends from the proximal end toward the center in the length direction. The both sides film portions 2a, 2a of the gusset film portion 2 are removed by cutting obliquely downward together with the upper half portions of the both side film portions 1a, 1a of the main body film portion 1 and the inclined cutting edge 6 A horizontal cutting edge 7 parallel to the lower crease 4 of the gusset film portion 2 is provided from the lower end (downwardly inclined end) of the gusset film to the tip of the gusset film portion 2, and the main body film portion 1 and the gusset It is excised upper half portion at the distal end of the Irumu portion 2.

  And the inclined upper edge of the one side film part 1a of the main body film part 1 and the one side film part 2a of the gusset film part 2 which are overlapped with each other by heat-sealing the inclined cut edge part 6, and the main body film part The inclined upper end edge of the other side film portion 1a and the other side film portion 2a of the gusset film portion 2 are formed in the inclined heat fusion portions 8 and 8 integrally connected so as to be peeled off.

  The leading ends of these two inclined heat fusion portions 8, 8, that is, the downward inclined ends are the lower ends of the gusset film portion 2 at a position where a small gap (about 2 cm) exists from the leading end of the gusset film portion 2 toward the base end side. The gusset film portion is folded in half between the horizontal cut edge 7 protruding from the tips of the two side film portions 1a and 1a and the lower end fold 4 of the gusset film portion 2 until the tip of the fold 4 is reached. 2 is formed on the opening piece 9 whose base end is continuous with the lower inclined ends of the both-side inclined heat fusion portions 8, 8, and below the both-side inclined heat fusion portions 8, 8. The longitudinally inclined heat-sealed portion 10 is formed by thermally fusing the two-fold front end portion of the main body film portion 1 from the inclined end to the lower-end crease 3 at right angles to the both-side inclined heat fusion portions 8, 8. .

  The length of the vertically inclined heat-sealing portion 10 is formed to be equal to the thickness of the plane B-shaped food B having a certain thickness to be accommodated, and when the food B is accommodated, the tip of the food B is vertically inclined heat. In the state where the gusset film portion 2 is formed so as to be brought into contact with and received by the fusion portion 10 and the both side film portions 2a and 2a are spread out in a horizontal plane, both side inclined heat fusion portions 8, 8 is formed so as to be the same size and the same shape as the upper surface of the triangular planar shape of the food B to be accommodated. The base end opened by the base portion of the main body film portion 1 having the upper end fold line 5 and the base portion of the gusset film portion 2 folded into the base portion is used as a food storage port 12, and this food Seal the rear end of the food stored in the bag from the storage port 12. It is formed in sealing portion 11.

  In order to wrap the flat triangular food B having a certain thickness with the food packaging bag A configured as described above, as shown in FIG. 4, both sides of the gusset film 2 are supported by the lower fold line 4 of the gusset film 2. The gusset film part 2 is horizontally expanded by expanding the film parts 2a, 2a in the left-right direction together with the upper half parts of the two film parts 1a, 1a in the main body film part 1 that overlaps the outer surfaces of the two film parts 1a, 1a. The side film portions 1a and 1a of the main body film portion 1 are expanded in the left-right direction to open the food storage port 12 at the base end of the sealing portion 11, and the food B is inserted through the food storage port 12 into the bag. To house.

  At this time, as the food B is inserted into the packaging bag A, the both side film portions 2a, 2a of the gusset film portion 2 are spread horizontally and cover the triangular upper surface of the food B with the lower surface thereof. Along with the development of the both side inclined heat fusion portions 8 and 8 in the both side film portions 2a and 2a, the unsealing pieces 9 connected to the tip portions of the both side inclined heat fusion portions 8 and 8 connected to each other are also left and right with the lower end fold 4 as a fulcrum. On the other hand, the both side film portions 1a, 1a of the main body film portion 1 are tapered toward the tip of the food B and both the side surfaces while being expanded along the bottom surface of the food. The bottom surface is covered, and the food B is completely contained in the packaging bag A when the front end of the food B hits the longitudinally inclined heat-sealed portion 10 at the front end of the main body film portion 1.

  In this state, the upper surface of the food B is entirely covered with a triangular film portion surrounded by the both-side inclined heat fusion portions 8, 8 in the gusset film portion 2, and the main body film portion 1 having the upper end fold 5. The sealing part 11 formed by the base of the gusset film part 2 and the base part of the gusset film part 2 protrudes rearward from the rear end face (base end face) of the food B, and the sealing part 11 is folded and sealed on the rear end face of the food B By doing so, as shown in FIGS. 5 and 6, the food B is packaged in a sealed state by the packaging bag A.

  In order to take out the food B from the inside of the packaging bag A, as shown in FIG. 7, the gusset film portion 2 has a bifurcated end portion protruding forward from the front end portions of the both-side inclined heat fusion portions 8, 8. If the opening piece 9 that has been formed is picked and rolled up, and the opening piece 9 is moved while being pulled toward the rear, which is the base end side of the packaging bag A, the opening piece 9 The tip of the gusset film part 2 having the opening piece 9 is peeled off from the tip of both side inclined heat fusion parts 8, 8 integrally connected to the base end, and the tip of the both side film parts 1 a, 1 a of the main body film part 1. As shown in FIG. 8, the both-side inclined heat-sealed portions 8, 8 are peeled off from each other and then gradually separated from the opening piece 9 side in the width direction as the opening piece 9 moves rearward. Body film part covering both sides of food B If the gusset film part 2 is peeled from the upper edge of the both side film parts 1a, 1a, the whole food B is covered with the main body film part 1, and the upper surface of the food B is exposed to the outside. Can be opened.

  If the main body film portion 1 covering the bottom surface of the food B is pushed up in this state, the food B can be taken out from the main body film portion 1 as shown in FIG.

  FIG. 10 to FIG. 13 show a method for manufacturing the packaging bag A. First, as shown in FIG. 10, the packaging bag A has a circumferential length capable of packaging food B and an inner circumferential surface is formed in a sealant layer. As shown in FIG. 11, a gusset film portion 2 is formed by folding a long cylindrical film a (a part of which is shown in FIG. 10) into a vertically flat cylindrical shape while folding the upper portion into the lower half. In addition, the main body film portion 1 is formed by film portions other than the gusset film portion 2.

  At this time, the body film portion 1 and the gusset film portion 2 are formed, and both side film portions 1a and 1a of the body film portion 1 covering the gusset film portion 2 are sandwiched from both sides to form the inside of the body film portion 1. The two side film portions 2a, 2a of the gusset film portion 2 folded into the two sides and the two side film portions 1a, 1a of the main body film portion 1 covering the two side film portions 1a, 1a Upper folds 5 and 5 refracted in an inverted V shape at the upper edge of both side film parts 1a and 1a of part 1 and the upper edge of both side film parts 1a and 1a of gusset film part 2 connected to this upper edge. Are formed at the same time as the lower end edges of the two side film portions 1a, 1a of the main body film portion 1 and the lower side edges of the gusset film portion 2 provided in parallel to the lower end edges with a certain distance from the lower end edge. Lower folds 3 and 4 refracted in a V shape are formed at the lower edges of the film portions 2a and 2a.

  Next, as shown in FIG. 12, the cylindrical film folded in a flat shape having the main body film portions 1a and 1a and the gusset film portion 2 is divided into 12 pieces for each wrappable length of the food B, and then the packaging film. At the same time as forming the main body a ′, the upper end folds 5 and 5 from the dividing line 12 on one end side (base end side) of the packaging film main body a ′ to the other end side (tip end side) are left at a predetermined length when the main body a ′ is cut. From the top ends of these upper end folds 5 and 5 to the center in the vertical direction in the vicinity of the front end of the gusset film portion 2 folded into the main body film portion 1, Cut 6 diagonally downward together with the half, and cut 7 horizontally parallel to the lower fold line 4 of the gusset film portion 2 from the inclined cut end to the center in the vertical width direction at the tip of the gusset film portion 2. Removing the gusset film portion and the body portion of the film upward from the inclined cutting line 6 and the horizontal cutting line 7 by (see FIG. 13).

  Further, by applying the inclined cutting line 6 and the horizontal cutting line 7 and simultaneously heat-sealing along the inclined cutting end face, the one-side film part 1a and the gusset film part 2 that overlap each other are overlapped. Inclined upper end edge of one side film part 2a and the upper end edge of the other side film part 1a of the main body film part 1 and the other side film part 2a of the gusset film part 2 are integrally connected so as to be peeled off. In addition to forming the heat fusion portions 8 and 8, the two-side inclined heat fusion portions 8 and 8 are formed from the tip of the inclined heat fusion portions 8 and 8 to the lower end crease 3 of the two-fold front end portion of the main body film portion 1. It is formed in the vertically inclined heat-sealed portion 10 by heat-sealing at a right angle to the front end portion, which is folded in half between the horizontal cutting edge portion 7 and the lower end fold line 4 of the gusset film portion 2, with its base end Tip of both sides inclined heat fusion part 8, 8 A packaging bag A formed on the unsealed piece 9 is obtained.

DESCRIPTION OF SYMBOLS 1 Main body film part 2 Gusset film part 3, 4 Lower end crease 5 Upper end crease 6 Inclined cutting edge 7 Horizontal cutting edge 8, 8 Both sides inclined heat fusion part 9 Opening piece 9 Sealing piece
9a, 9a Sealed ends on both sides
10 Longitudinal inclined heat fusion part
11 Sealing part

Claims (4)

  A main body film portion in which a film having a width that can cover the bottom surface from both side surfaces of a food having a constant triangular thickness is folded in two from the center in the width direction, and both sides of the main body film portion These main body films are composed of gusset film portions that are folded from the upper edge into the main body film portion, and the lower end folds are arranged parallel to the lower end folds of the main body film portion with a certain distance therebetween. The upper end crease in which the upper end edges on both sides of the part and the gusset film part are continuously connected to each other is provided at a fixed length part from the base end toward the center part with one end side of the upper end edges on both sides as a base end. The top fold from the top crease tip to the tip of the main body film part and the gusset film part is obliquely downward along with the main body film part to the vicinity of the front end of the gusset film part. It has been removed by cutting, and the cut edges are formed in both side inclined heat fusion parts that are integrated so that the upper end edges on both sides of the gusset film part and the main body film part can be peeled off by heat fusion, Further, the two-side inclined heat fusion part is heat-sealed so as to be connected at right angles to the both-side inclination heat fusion part from the lower inclination end of the main body film part to the lower end fold, and the longitudinal inclination heat fusion part. A food packaging bag characterized in that it is formed in a dressing portion and a bi-folded tip portion of a gusset film portion projecting from the tip of both side inclined heat fusion portions is formed in an opening piece.   It is formed in a sealed part that is folded and sealed after food is received by the base of the main body film part that is provided continuously through the upper fold and the base part of the gusset film part that is folded into the base part. The food packaging bag according to claim 1.   The planar shape surrounded by the two-side inclined heat fusion part when the gusset film part folded in the main body film part is developed is formed in the same size and the same shape as the upper surface of the planar triangular shape of the food to be accommodated. The food packaging bag according to claim 1, wherein   A horizontal cutting edge parallel to the lower fold of the gusset film portion is provided from the lower inclined end of the inclined cutting edge portion provided with the both sides inclined heat fusion portion toward the tip of the gusset film portion, and the horizontal cutting edge and the gusset The bifurcated front end between the lower folds of the film part is formed on the opening piece, and the lower inclined end of the both side inclined heat fusion part is provided until reaching the front end of the lower fold of the gusset film part. The food packaging bag according to claim 1, wherein a base end of the unsealed piece is connected to a lower inclined end of the both-side inclined heat fusion portion.

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