Web corner type paper container

Abstract

To provide a web corner type paper container which can be folded into a flat shape at the time of disposal and can reduce the volume.SOLUTION: In a web corner type paper container of a laminate including a paper layer and a resin layer, a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate are connected respectively. At each side plate, a web corner part is formed in which triangular folding pieces are connected at both sides respectively. At the front side plate and the rear side plate, flaps are connected. At the left side plate and the right side plate, a left half upper plate and a right half upper plate are connected respectively, and an upper surface is closed by folding these to the inside. At the front side plate, the rear side plate, the flaps and the bottom plate, a linear folding line is formed at the center. Furthermore, at the bottom plate, radial folding lines are formed extending toward four corners from the center, and the web corner type paper container can be folded into a flat shape and raised into a box shape.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a web corner type paper container formed by a laminate having a resin layer on the inner surface of a paper layer, and more specifically, to a web corner type paper container that can be folded flat and stood up into a box shape. [Background technology]

[0002] Conventionally, web corner type paper containers have been widely used to prevent leakage of food with oil or seasonings or food that releases juices, such as simmered food. The main reason for this is that web corner type paper containers are made of a single blank, and have a structure in which, for example, a rectangular bottom plate is provided in the center, the periphery is folded along the edges to make the side plates stand up, and the four corners are folded outward and bonded to the outer surfaces of the side plates, providing excellent leakage prevention effects.

[0003] Furthermore, in recent years, it has become known that web corner type paper containers can be used as paper containers for heating in a microwave oven by providing a top panel connected to the side panels, placing food for microwave cooking inside, and covering the top panel (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-83398 A Summary of the Invention [Problem to be solved by the invention]

[0005] The web corner type paper container is an excellent paper container that is effective in preventing liquid leakage, but has a problem in that the paper container is bulky when disposed of after use.

[0006] The present invention has been made to solve the above problems, and its object is to provide a web corner type paper container that can be folded when disposed of, thereby reducing the volume of waste. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention as described in claim 1 provides a web corner type paper container formed of a laminate having a resin layer on the inner surface of a paper layer, wherein a front panel, a rear panel, a left panel, and a right panel are each connected to the top, bottom, left and right sides of a rectangular bottom panel via fold lines, and each of these side panels has a triangular fold-in piece connected to both side sides via fold lines, and adjacent fold-in pieces are connected to each other via radial fold lines extending outward from the corners of the bottom panel to form a web corner portion, and the front panel and the rear panel each have a flap connected to their upper sides via fold lines, and the left panel and the right panel each have a left half upper panel and a right half upper panel connected to their upper sides via fold lines, and the tips of the left half upper panel and the right half upper panel have mutually reciprocating edges. and a web corner-type paper container having a web corner portion formed thereon, the web corner portions are attached to the outside of the side panels in a folded outward state to form a box shape, and the left and right upper panels are then folded inward and the engaging portions formed at their tips are engaged with each other to close the top. The front and rear panels and the flaps connected to their upper edges, as well as the bottom panel, each have a straight fold line formed in the center and are arranged in a row in the vertical or horizontal direction, and the bottom panel has radial fold lines formed thereon extending from the center to the four corners, so that the bottom panel can be folded flat at the fold lines and the radial fold lines and can be stood up into a box shape.

[0008] The present invention described in claim 2 relates to a web corner type paper container formed of a laminate having a resin layer on the inner surface of a paper layer, in which a front panel, a rear panel, a left panel, and a right panel are connected to the top, bottom, left, and right sides of a rectangular bottom panel via fold lines, and each of these side panels has a triangular fold-in piece connected to both sides via fold lines, and adjacent fold-in pieces are connected to each other via radial fold lines extending outward from the corners of the bottom panel to form a web corner portion, and the front panel and the rear panel have folds on their upper sides. A left half upper plate and a right half upper plate are respectively connected to the left side plate and the right side plate via a folding line at their upper edges, and engaging portions shaped to engage with each other are formed at the tips of the left half upper plate and the right half upper plate. The left and right half upper plates are folded outwardly and attached to the outside of the side plates in a state where each web corner portion is folded outward, to form a box shape, and then the left and right half upper plates are folded inwardly and the engaging portions formed at the tips of the left and right upper plates are engaged with each other to close the top surface. A first straight fold line is formed on the flap connected to the upper side of the rear panel, and a first Y-shaped fold line branching into three and a linear second fold line are formed on the front panel and the rear panel, and the first Y-shaped fold line is formed by a diagonal line extending from a branch point toward a corner of the bottom panel and a straight line extending toward the flap, a second fold line is formed on the left panel in a direction in which the front panel and the rear panel face each other, and the folding pieces adjacent between the left panel and the front panel and between the left panel and the rear panel have second fold lines. and when the bottom plate and the portion of the left side plate from the second fold line to the bottom plate are folded at the second fold line of the left side plate and placed on the left side plate, the second fold lines of the front plate and the rear plate and the second fold line of the fold-in piece are formed to be folded in synchronization with the folding operation of the second fold line of the left side plate, and the web corner type paper container can be folded at the first fold line and the second fold line and can be stood up into a box shape.

[0009] The present invention described in claim 3 is a web corner type paper container described in claim 1 or claim 2, characterized in that the engaging portion has a bulge portion at the tip of the left half upper plate and the right half upper plate that bulges outward from one outer end to the center, a notch is formed on the center side of the bulge portion and a protrusion is formed on the outer end side of the bulge portion, the flap has a slit into which the protrusion is inserted, the left half upper plate and the right half upper plate are folded inward and the notches of the engaging portions formed at their tips are engaged with each other to close the top surface, and the left half upper plate and the right half upper plate are engaged with the slit formed in the flap by inserting the protrusion into the slit formed in the flap. Effect of the Invention

[0010] The web corner type paper container of the present invention can be folded when discarded, thereby reducing the volume of waste. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a web corner type paper container according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a development view of a blank for assembling the web corner type paper container of FIG. 1. [Diagram 3] FIG. 3 is an explanatory diagram showing an intermediate state in which a web corner type paper container is assembled from the blank of FIG. 2. [Figure 4] 4 is an explanatory diagram showing the web corner type paper container in the intermediate assembly state of FIG. 3 in a folded state. FIG. [Diagram 5] FIG. 2 is a cross-sectional view showing the layer structure of a laminate of blanks for a web-corner type paper container of the present invention. [Figure 6] FIG. 11 is a perspective view showing a web corner type paper container according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a development view of a blank for assembling the web corner type paper container of FIG. 6. [Figure 8]FIG. 8 is an explanatory diagram showing an intermediate state in which a web corner type paper container is assembled from the blank in FIG. 7. [Figure 9] 9 is an explanatory diagram showing the intermediately assembled web corner type paper container of FIG. 8 in a folded state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in detail below with reference to the drawings.

[0013] FIG. 1 is a perspective view showing a web-corner type paper container of a first embodiment of the present invention; FIG. 2 is a development view of a blank for assembling the web-corner type paper container of FIG. 1; FIG. 3 is an explanatory diagram showing an intermediate state of assembling a web-corner type paper container from the blank of FIG. 2; FIG. 4 is an explanatory diagram showing a folded state of the web-corner type paper container in the intermediate assembly state of FIG. 3; FIG. 5 is a cross-sectional view showing the layer structure of a laminate of blanks for a web-corner type paper container of the present invention; and FIG. 6 is a perspective view showing a web-corner type paper container of a second embodiment of the present invention. FIG. 7 is a development view of a blank for assembling the web corner type paper container of FIG. 6. FIG. 8 is an explanatory diagram showing an intermediate state of assembling a web corner type paper container from the blank of FIG. 7. FIG. 9 is an explanatory diagram showing a folded state of the web corner type paper container in the intermediate state of assembly of FIG. 8. In the figures, C1 and C2 are web corner type paper containers, 1 is a bottom plate, 2 is a front plate, 3 is a rear plate, 4 is a left plate, 5 is a right plate, 2a, 3a, 4a, and 5a are fold-out plates. In the figure, the reference numerals 6 and 7 denote flaps, 6a and 7a denote slits, 8 denotes the left upper plate, 9 denotes the right upper plate, 8a and 9a denote bulges, 8b and 9b denote notches, 8c and 9c denote protrusions, 8d and 9d denote overlapping portions, 10 denotes folding lines, 11 denotes radial folding lines, 12 denotes the first folding line, 12a denotes a branch point, 12b denotes a diagonal line, 12c denotes a straight line, 13 denotes a second folding line, 20 and 30 denote blanks, 21 denotes a paper layer, 22 denotes a resin layer, W denotes a web corner portion, and a, b, and c denote fold lines.

[0014] FIG. 1 is a perspective view showing a web corner type paper container of a first embodiment according to the present invention, and the web corner type paper container C1 is formed by assembling blanks 20 shown in a developed view in FIG.

[0015] The blank 20 shown in Fig. 2 is formed by punching out into a predetermined shape a laminate having a resin layer on the inner surface of a paper layer made of paperboard, with a front panel 2 and a rear panel 3 connected to the top and bottom edges (left and right in Fig. 2) of a rectangular bottom panel 1 via fold lines, and a left panel 4 and a right panel 5 connected to the left and right edges (top and bottom in Fig. 2) of the bottom panel 1 via fold lines, respectively. Triangular fold pieces 2a, 3a, 4a, 5a are connected to both sides of the front panel 2, rear panel 3, left panel 4, and right panel 5 via fold lines, respectively, and adjacent fold pieces are connected to each other via radial fold lines a extending outward from the corners of the bottom panel 1 to form a web corner portion W.

[0016] Flaps 6 and 7 are connected to the upper edges of the front panel 2 and the rear panel 3 via fold line b, and left half upper panel 8 and right half upper panel 9 are connected to the upper edges of the left panel 4 and the right panel 5 via fold line b, with engaging portions formed at the tips of the left half upper panel 8 and the right half upper panel 9 to engage with each other. In Fig. 2, the engaging portions are formed at the tips of the left half upper panel 8 and the right half upper panel 9 via fold line c with bulging portions 8a and 9a bulging outward, and the bulging portions 8a and 9a are long horizontally from one outer end to the center, approximately half the length of the left half upper panel 8 and the right half upper panel 9 in the left-right direction in Fig. 2, with groove-shaped notches 8b and 9b provided at the center of the bulging portions 8a and 9a, and protrusions 8c and 9c formed at the outer ends. The bulging parts 8a, 9a are formed point symmetrically, and the groove-shaped notches 8b, 9b mesh with each other and engage with each other. The left half upper plate 8 and the right half upper plate 9 are folded inward, and the groove-shaped notches 8b, 9b are engaged with each other to close the upper surface. The engaging part is not limited to the structure shown in FIG. 2, as long as the left half upper plate 8 and the right half upper plate 9 mesh with each other. The bulging parts 8a, 9a, the notches 8b, 9b, and the protruding parts 8c, 9c are collectively called the engaging part. Also, the outer side as viewed from the center of the blank 20 may be called the upper side. In FIG. 2, the blank 20 is rotated 90° clockwise for convenience, and the up-down direction refers to the left and right in the drawing, and the left-right direction refers to the up-down direction in the drawing. Hereinafter, the up-down direction and the left-right direction will be referred to according to the drawing.

[0017] Flaps 6 and 7 are connected to the front panel 2 and the rear panel 3 via fold line b, and have slits 6a and 7a into which protrusions 8c and 9c are inserted. The slits 6a and 7a penetrate the blank 20 in the left-right direction, and the slits 6a and 7a are surrounded by an ellipse with a cut having a ratchet stop, and the slits 6a and 7a are located on the major axis of the ellipse surrounded by the cut on the outer periphery.

[0018] The web corner type paper container C1 of the first embodiment is characterized by having folding lines 10 and radial folding lines 11, the bottom plate 1 has a straight folding line 10 in the left-right direction and radial folding lines 11 extending from the center of the bottom plate 1 to the four corners, the front plate 2, the rear plate 3 and the flaps 6, 7 connected to their upper edges have straight folding lines 10 extending in the left-right direction formed in the center of each plate in the up-down direction, and each folding line 10 and the folding line 10 of the bottom plate 1 are arranged so as to be located on an imaginary straight line that crosses the centers of the flap 6, the front plate 2, the bottom plate 1, the rear plate 3 and the flap 7. With this configuration, as will be described later, the web corner type paper container C1 can be folded flat at the folding lines 10 and the radial folding lines 11 and can be erected into a box shape.

[0019] Of the fold lines shown by dotted lines in FIG. 2, for example, fold line a is a pressed crease, fold line b shown by dashed lines is preferably formed by perforations, and fold line c shown by dashed dotted lines is preferably a lead crease consisting of a pressed crease and a cut.

[0020] Next, a method of assembling the blank 20 will be described with reference to Figure 2. The front panel 2, rear panel 3, left panel 4, and right panel 5 are folded upright at the fold lines relative to the bottom panel 1, and the folded pieces 2a, 3a, 4a, and 5a are pulled outward and folded in along the fold line a to form a web corner W. With each web corner W folded outward, the outside of the folded piece 4a is placed on the outside of the left panel 4, and the outside of the folded piece 5a is placed on the outside of the right panel 5, and these are then glued together to form a box shape as shown in Figure 3. Each side panel of the box shape is an isosceles trapezoid with the upper base longer than the lower base, so a box is formed that has a taper that widens upward.

[0021] There are two ways to use the web corner type paper container C1 of the present invention. In one way, multiple boxes are stacked as shown in Fig. 3 and transported to the filling process, and then the boxes are taken out one by one and the contents are placed inside. Then, the left half upper plate 8 and the right half upper plate 9 are folded inward, and the bulges 8a and 9a formed on the tips of the left half upper plate 8 and the right half upper plate 9 are folded at the fold line c to make a valley fold and stand up, while the notches 8b and 9b are interlocked with each other. At this time, the upper edge portion of the left upper plate 8, which is located on the opposite side of the bulge 8a from the cutout 8b, becomes an overlapping portion 8d in a state where it is extended slightly outward due to the formation of the cutout 8b, and this extended overlapping portion 8d is overlapped by slipping into the inside of the right upper plate 9, and similarly, the upper edge portion of the right upper plate 9, which is located on the opposite side of the bulge 9a from the cutout 9b, becomes an overlapping portion 9d in a state where it is extended slightly outward due to the formation of the cutout 9b, and this extended overlapping portion 9d is overlapped by slipping into the inside of the left upper plate 8, and the top of the box is closed to form a lid by engaging the notches 8b, 9b.

[0022] Next, the flaps 6 and 7 are folded inward, and the protruding portion 9c is inserted into the slit 6a, and the protruding portion 8c is inserted into the slit 7a, so that the lid with the left half upper plate 8 and the right half upper plate 9 can be securely fixed. The upright bulging portions 8a and 9a become gripping portions, making the shape suitable for a take-out paper container. Although the structure in which the protruding portions 8c and 9c are provided on the bulging portions 8a and 9a, and the slits 6a and 7a are provided on the flaps 6 and 7 are not essential, the lid can be securely fixed by inserting the protruding portions 9c and 8c into the slits 6a and 7a, and the bulging portions 8a and 9a become gripping portions, so this is a preferred embodiment. If the slits 6a and 7a are not provided, the flaps 6 and 7 can be folded inward first so as to overlap with the inner surfaces of the left half upper plate 8 and the right half upper plate 9.

[0023] In the second method of use, as shown in Figure 3, while the top is open, the bottom plate 1 is pushed inward at its center, and the bottom plate 1 is mountain-folded at the folding line 10, and then folds at the radial folding lines 11 so that the center of the bottom plate 1 becomes the apex, while at the same time making a valley fold of the front plate 2 and the flap 6, and the rear plate 3 and the flap 7 at the folding line 10, and folding each inward. In this way, it can be folded into a flat shape as shown in Figure 4. When viewed from the folded bottom plate 1 side, the outer shape has the shape of one of two M shapes with one M reversed and the legs of the M touching each other. In addition, the bulges 8a, 9a that constitute the engagement portion protrude outward on the cutouts 8b, 9b sides, and the inner surfaces of the protruding portions of the bulges 8a, 9a on the cutouts 8b, 9b sides overlap each other. When folded, it is preferable that the outer surfaces of the protruding portions of the bulges 8a, 9a at the protruding portions overlap each other and engage with the cutouts 8b, 9b, thereby further reducing bulk.

[0024] When the folded web corner type paper container shown in Fig. 4 is used, the folding lines 10 and radial folding lines 11 are pushed outward to spread the folded front panel 2, rear panel 3 and bottom panel 1, and the box shape is restored as shown in Fig. 3. By using paperboard for the paper layer 21 (see Fig. 5) of the blank 20 of the web corner type paper container C1, the rigidity of the laminate is obtained, making it easy to restore the box shape.

[0025] In this way, the web corner type paper container C1 can be folded and easily assembled when in use, so it does not take up much space and requires less storage space. It can also be easily assembled, and the contents can be stored in the assembled web corner type paper container C1. After the contents have been consumed, the paper container can be easily folded flat in the above-mentioned manner, so it does not take up much space.

[0026] The layer structure of the laminate constituting the blank 20 which achieves such an effect is shown in Figure 5. The blank 20 is a laminate in which a resin layer 22 is laminated on the inner side of a paper layer 21. For the paper layer 21, a paperboard having a stiffness sufficient to stand up the folded web corner type paper container C1 is used. Coated cardboard, uncoated cardboard, kraft cardboard, manila cardboard, etc. can be used, and the basis weight is, for example, 220 g / m 2 More than 550g / m 2 Less than 350 g / m is preferable. 2 More than 450g / m 2 More preferably, the outer surface of the paper layer 21 may be plain, but is usually printed with a design, text, etc.

[0027] Resins such as polyethylene, polypropylene, polyethylene terephthalate, and polybutylene terephthalate are used for the resin layer 22, and these resins are laminated to the paper layer 21 by hot melt extrusion. Alternatively, these resins are made into a film and dry laminated to the inner surface of the paper layer 21 using a urethane adhesive or the like. The thickness of the resin layer 22 is usually 12 μm to 60 μm. The resin layer 22 may also be provided as a surface coating layer by coating the inner surface of the paper layer 21 with a resin composition that is oil-resistant, water-resistant, and heat-resistant. By providing the resin layer 22, it is possible to prevent leakage of liquid even if the contents are foods with oil, seasonings, etc. attached thereto, or foods that release juice such as simmered foods. Furthermore, by using resins such as polypropylene, polyethylene terephthalate, and polybutylene terephthalate, heat resistance is obtained, and the contents can be cooked in a microwave oven while still contained in the web corner type paper container C1.

[0028] The web corner type paper container C1 in FIG. 1 can be folded, so it can be folded and stored before use, saving space, and when used or sold, it can be unfolded to become a paper container and store products, making it suitable as a take-out paper container for products sold at stores. Furthermore, after use, it can be folded and disposed of, reducing the volume of waste. In addition, when folding, the protruding parts on the cutouts 8b, 9b side of the bulging parts 8a, 9a that constitute the engagement part are preferably engaged at the cutouts 8b, 9b so that the outer surfaces of the protruding parts overlap each other when folded, making it possible to further reduce bulk. In addition, when cooking in a microwave oven, the web corner type paper container C1 containing food can be heated and cooked in the microwave oven as it is, and after cooking, the bulging parts 8a, 9a become the handles, so the food can be safely removed from the oven, preventing burns, etc. After that, the web corner type paper container C1 can be used as tableware by opening the lid, so it can be eaten as it is, making it a convenient container for users.

[0029] Fig. 6 is a perspective view showing a web corner type paper container C2 of a second embodiment of the present invention, which is formed by assembling the blank 30 shown in Fig. 7. The blank 30 in Fig. 7 has the same shape as the blank 20 shown in Fig. 2 except for the positions and shapes of the fold lines, and the same reference numerals are used and the description is omitted. Note that in Fig. 7, for convenience, the blank is rotated 90° clockwise, and the up-down direction refers to the left and right in the drawing, and the left-right direction refers to the up-down direction in the drawing. Below, the up-down direction and the left-right direction will be referred to according to the drawing.

[0030] As shown in Figure 7, the blank 30 forming the web corner type paper container C2 of the second embodiment has a first straight fold line 12 formed in the left-right direction on the flaps 6, 7 connected to the upper edges of the front panel 2 and the rear panel 3.

[0031] A Y-shaped first folding line 12 is formed on the front panel 2 and the rear panel 3, which is branched into three. The Y-shaped first folding line 12 is formed by a diagonal line 12b extending from a branch point 12a toward the corner of the bottom panel 1 and a straight line 12c extending in the left-right direction toward the flaps 6 and 7. The straight line 12c and the first folding line 12 formed on the flaps 6 and 7 are arranged so as to be located on an imaginary straight line that crosses the center of the flap 6, the front panel 2, the rear panel 3, and the flap 7. Furthermore, a linear second folding line 13 is formed on the front panel 2, which extends linearly from the branch point 12a toward the folding piece 2a. The second folding line 13 is formed at a distance from the branch point 12a and the folding piece 2a, and does not contact the folding lines adjacent to the front panel 2. Similarly, a second folding line 13 is formed on the rear panel 3. The first folding line 12 and the second folding line 13 formed on the front panel 2 and the rear panel 3 are plane symmetrical.

[0032] A second fold line 13 is formed in the left-right direction on the left side panel 4 in a straight line in the direction in which the front panel 2 and the rear panel 3 face each other, and it is preferable that the second fold line 13 is formed parallel to the first fold line 12 formed on the flaps 6, 7 and the straight line 12c between the front panel 2 and the rear panel 3.

[0033] The folding pieces 4a, 2a that form the web corner portion W have a straight second fold line 13, and when imaginary straight lines are drawn extending from the second fold lines 13 formed on the front panel 2, folding piece 2a, folding piece 4a, and left panel 4, the front panel 2, folding piece 2a, folding piece 4a, and left panel 4 are formed so as to intersect at adjacent fold lines. Similarly, the folding pieces 4a, 3a that form the web corner portion W have a straight second fold line 13, which is plane-symmetrical to the second fold line 13 formed on the folding pieces 4a, 2a that form the web corner portion W. In this way, it is preferable that the first fold line 12 and the second fold line 13 are formed symmetrically with respect to the left side panel 4 and the bottom panel 1. As will be described later, when the bottom panel 1 and the portion of the left side panel 4 from the second fold line 13 to the bottom panel 1 are folded at the second fold line 13 of the left side panel 4 and overlapped with the left side panel 4, the second fold line 13 of the front panel 2 and the rear panel 3 and the second fold lines 13 of the folding pieces 4a, 3a and the folding pieces 4a, 2a will be folded in unison with the folding operation of the second fold line 13 of the left side panel 4, thereby facilitating folding.

[0034] Figure 8 is an explanatory diagram showing the intermediate state of assembling a web corner type paper container C2 from the blank 30 of Figure 7. By assembling it in the same procedure as the web corner type paper container C1, a box having a taper that widens upward is obtained.

[0035] Web corner type paper container C2 can be used in two ways, the same as web corner type paper container C1. In one way, multiple boxes are stacked as shown in Figure 8 and transported to the filling process, then the boxes are taken out one by one, the contents are placed inside, and the box is closed with a lid. Then, the protrusion 9c is inserted into the slit 6a of the flaps 6 and 7, and the protrusion 8c is inserted into the slit 7a, so that the lid is securely fixed to close the top with the left half upper plate 8 and the right half upper plate 9.

[0036] In the second method of use, as shown in FIG. 8, when the top is open, the Y-shaped first fold line 12 of the front panel 2 and the rear panel 3 is pushed inward, so that the Y-shaped first fold line 12 is valley-folded inward. At this time, the first fold lines 12 formed on the flaps 6 and 7 are also valley-folded. When the straight lines 12c of the valley-folded Y-shaped first fold lines 12 approach each other, the second fold line 13 of the left panel 4 is pushed inward or the second fold line 13 of the left panel 4 and the second fold lines 13 of the folding pieces 2a and 3a are pushed inward. Then, the second fold line 13 of the front panel 2 and the rear panel 3 and the second fold line 13 of the folding piece 4a attached to the left panel 4 are bent in unison with the bending operation of the second fold line 13 of the left panel 4, and the product can be folded as shown in FIG. 9. Furthermore, during use, it can be stood up in a box shape as shown in Fig. 8. As shown in Figs. 8 and 9, when the portion of bottom plate 1 and left side plate 4 from second fold line 13 to bottom plate 1 is folded at second fold line 13 of left side plate 4 and placed on left side plate 4, it is preferable that second fold line 13 of left side plate 4 and second fold lines 13 formed on folding pieces 4a, 2a, 3a, front plate 2, and rear plate 3 are aligned in a straight line in a plan view.

[0037] When using the folded web corner type paper container shown in Fig. 9, the folded front panel 2, rear panel 3 and left panel 4 are unfolded by pushing and spreading apart the second fold line 13 and the first fold line 12, and the box shape is restored as shown in Fig. 8. By using paperboard for the paper layer 21 (see Fig. 5) of the blank 30 of the web corner type paper container C2, the rigidity of the laminate is obtained, making it easy to restore the box shape.

[0038] In this way, the web corner type paper container C2 can be folded and easily assembled when in use, so it does not take up much space and can be stored in a small space. Furthermore, the assembled web corner type paper container C2 can be folded easily after the contents are stored in it and the contents are eaten, reducing the volume of waste.

[0039] It should be noted that the embodiments described so far are representative embodiments of the web corner type paper container of the present invention, and the web corner type paper container of the present invention is not limited to these, and also includes those that do not deviate from the spirit of the present invention. [Explanation of symbols]

[0040] 1 Bottom plate 2 Front side panel 2a Fold-in piece 3 Rear plate 3a Fold-in piece 4 Left side board 4a Fold-in piece 5 Right side plate 5a Fold-in piece 6, 7 Flap 6a, 7a slit 8 Upper left half plate 8a, 9a bulge 8b, 9b cutout 8c, 9c protrusion 8d, 9d Polymerization part 9 Right upper plate 10 Folding Lines 11 Radial fold lines 12 First fold line 12a Junction 12b diagonal line 12c straight line 13 Second fold line 20, 30 Blank 21 Paper layer 22 Resin layer C1, C2 Web corner type paper container W Web Corner a, b, c fold lines

Claims

1. A web corner type paper container formed by a laminate having a resin layer on the inner surface of a paper layer, The front, rear, left and right panels are connected to the top, bottom and left sides of the rectangular bottom panel via fold lines, Each of the side panels has triangular fold pieces connected to both sides via fold lines, and adjacent fold pieces are connected to each other via radial fold lines extending outward from the corners of the bottom panel to form web corners. A flap is connected to each of the front and rear panels via a fold line at the upper edge thereof, A left half upper plate and a right half upper plate are respectively connected to the left side plate and the right side plate via a fold line on the upper edge thereof, The left and right upper plates have engagement portions formed at their tips, the engagement portions being shaped to engage with each other, Each web corner portion is folded outward and attached to the outside of the side plate to form a box shape, and then the left half upper plate and the right half upper plate are folded inward, and the engaging portions formed at the tips of the left half upper plate and the right half upper plate are engaged with each other to close the top surface. the engagement portion is provided with a bulging portion at the tip of the left half upper plate and the right half upper plate, the bulging portion bulging outward from one outer end to the center, a notch is formed at the center side of the bulging portion, and a protrusion is formed at the outer end side of the bulging portion, The flap is formed with a slit into which the protrusion is inserted, the left half upper plate and the right half upper plate are bent inwardly, and the notches of the engagement portions formed at the tips of the left half upper plate and the right half upper plate are engaged with each other to close the upper surface; The left half upper plate and the right half upper plate are engaged with the slits of the flap by inserting the protrusions into the slits formed in the flap, The front and rear panels and the flaps connected to their upper edges, as well as the bottom panel, each have a straight folding line formed in the center, and are arranged in a line in the vertical or horizontal direction, Furthermore, the bottom plate has radial fold lines extending from the center to the four corners, A web corner type paper container that can be folded flat along the folding lines and the radial folding lines and can be stood up into a box shape.

2. A web corner type paper container formed by a laminate having a resin layer on the inner surface of a paper layer, The front, rear, left and right panels are connected to the top, bottom and left sides of the rectangular bottom panel via fold lines, Each of the side panels has triangular fold pieces connected to both sides via fold lines, and adjacent fold pieces are connected to each other via radial fold lines extending outward from the corners of the bottom panel to form web corners. A flap is connected to each of the front and rear panels via a fold line at the upper edge thereof, A left half upper plate and a right half upper plate are respectively connected to the left side plate and the right side plate via a fold line on the upper edge thereof, The left and right upper plates have engagement portions formed at their tips, the engagement portions being shaped to engage with each other, Each web corner portion is folded outward and attached to the outside of the side plate to form a box shape, and then the left half upper plate and the right half upper plate are folded inward, and the engaging portions formed at the tips of the left half upper plate and the right half upper plate are engaged with each other to close the top surface. the engagement portion is provided with a bulging portion at the tip of the left half upper plate and the right half upper plate, the bulging portion bulging outward from one outer end to the center, a notch is formed at the center side of the bulging portion, and a protrusion is formed at the outer end side of the bulging portion, The flap is formed with a slit into which the protrusion is inserted, the left half upper plate and the right half upper plate are bent inwardly, and the notches of the engagement portions formed at the tips of the left half upper plate and the right half upper plate are engaged with each other to close the upper surface; The left half upper plate and the right half upper plate are engaged with the slits of the flap by inserting the protrusions into the slits formed in the flap, A flap connected to the upper sides of the front and rear panels has a first straight fold line formed thereon; The front and rear panels are formed with a Y-shaped first folding line and a linear second folding line, the Y-shaped first folding line being formed with a diagonal line extending from a branch point toward a corner of the bottom panel and a straight line extending toward the flap, A second folding line is formed on the left side plate in a direction in which the front side plate and the rear side plate face each other, A second folding line is formed on the folding piece adjacent between the left side plate and the front side plate and between the left side plate and the rear side plate, When the bottom plate and the portion of the left side plate from the second fold line to the bottom plate are folded at the second fold line of the left side plate and overlapped with the left side plate, The second folding lines of the front and rear panels and the second folding line of the folding piece are formed to be folded in synchronization with the folding operation of the second folding line of the left panel, A web corner type paper container, which can be folded along the first fold line and the second fold line and can be stood up into a box shape.

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