JP6375883B2 - paper box - Google Patents

Description

  The present invention relates to a paper box.

  Semi-cooked food is cooked in a microwave oven. For example, there is a product in which freeze-dried food or seasoning liquid is packaged in a container body such as a plastic tray or a paper tray, and is wrapped with a lid material.

  In such products, there are things that open the lid material, open the contents in the container body, add water etc. if necessary, cover and cook with a microwave oven, but there is no steaming effect It was not possible to heat evenly and efficiently.

  In addition, even if the consumer uses cooking ingredients such as meat and vegetables at home to cook, it cannot be used as a wide range of cooking containers unless it has a steaming effect. On the other hand, although it is not what cooks with a microwave oven, there exists a container which can maintain the state which closed the lid | cover easily and cannot be opened unless a certain amount of force is applied.

  This is a container having a side wall, an end wall, and an upper lid. The upper lid has side wall side flaps that overlap each other and close the container, and an end wall side flap that is integral with the side wall side flaps. The flap forms a triangular wing that can be folded downward so as to be pressed against the end wall. The end wall extends from the upper end of the end wall side flap downward in the longitudinal direction of the end wall. A central fold line is formed, whereby the end wall can be bent inward to form a recess, and when the wing is bent downward in the direction of the end wall beyond the horizontal line, the end wall is bent inward. The side walls can be brought close together and the side flaps are held closed and overlapped at the top of the container by the wings pressed downward against the inwardly bent end walls. ( Patent Document 1).

  Known documents are shown below.

Japanese Patent No. 3101324

  The box described in Patent Document 1 cannot be filled with water or seasoning liquid due to a sack pasting and one-touch bottom structure. Moreover, water resistance was not considered.

  The present invention allows the lid to be easily closed, does not open unless a certain amount of force is applied, has a steaming effect with microwave heating, has water resistance, and leaks even when water or liquid is added. It is an object to provide a paper box that cannot be put out.

The present invention has been made in view of the above problems, and the invention of claim 1 is formed from a laminated sheet in which a thermoplastic resin layer is provided on the front and back surfaces of a paper layer, and a bottom plate and a continuous connection to the bottom plate. A side wall plate, an end wall plate connected to the side wall plate, and an upper lid,
The upper lid includes a side wall side flap that extends from an upper end of the side wall plate and overlaps each other to close the upper end opening, and an end wall side flap that is integral with the side wall side flap. A triangular wing that can be bent downward so as to be pressed against the end wall plate, and the end wall plate has an upper end from the upper end of the end wall side flap to the lower side of the end wall plate. An extending central crease is formed, whereby the end wall plate can be bent inward to form a recess, and when the wing is bent downward in the direction of the end wall plate beyond the horizontal line, The end wall plates can be bent inwardly, and the side wall plates can be brought close to each other, and the side wall side flaps are at the upper end by wings pressed downward against the end wall plates bent inwardly. Close and overlap openings A carton which is held in a state,
The end wall plate is a double wall of an inner end wall plate extended to one of the side wall plates and an outer end wall plate extended to the other side wall plate, and the outer end wall plate and the The bottom plate has a substantially triangular bottom side flap with two sides connected to the bottom plate, the bottom side flap is folded in two to form a substantially triangular bottom side wing, and is bent downward to contact the outside of the bottom plate, The inner end wall plate is continuously provided with an end wall side bonded piece and a bottom surface side bonded piece, the end wall side bonded piece is folded and fused between the outer end wall plate, The bottom-side bonded piece is a paper box that is fused while the bottom-side flap is folded in half.

  The paper box of the present invention is configured as described above, and the side wall side flaps are folded down so as to overlap each other, the triangular wings of the end wall side flaps are bent downward, and the lid is simply closed. It is not opened unless a certain amount of force is applied, has a steaming effect by microwave heating, and is made of a laminated sheet with a thermoplastic resin layer on the paper layer and the front and back surfaces, so water resistance is Yes, even if water or liquid is poured from the bottom structure, it will not leak.

  In the invention according to claim 2 of the present invention, a triangular crease is preliminarily attached to the end wall side flap, and when the side wall side flap is folded together, the triangular wing portion is easily formed. The paper box according to claim 1.

  Further, according to the present invention, since the triangular crease is preliminarily attached to the end wall side flap, the end wall side flap easily forms a triangular wing when the side wall side flap is folded together.

  According to a third aspect of the present invention, at the lower end portion of the end wall plate, there are provided two creases extending inward from both corners of the lower end and intersecting at a certain point on the central crease. The paper box according to claim 1, wherein the paper box is provided.

  The present invention is also provided with two ruled lines at the lower end portion of the end wall plate that extend upward and inward from both corners of the lower end and intersect at a certain point on the central folded ruled line. When the end wall plate is bent downward in the direction toward the end wall plate, the end wall plate is easily bent inward.

  The paper box of the present invention can be easily closed with a lid, will not open unless a certain amount of force is applied, has a steaming effect with microwave heating, is water resistant, and contains water or liquid. Will not leak.

It is explanatory drawing which showed typically the laminated sheet used for 1st Embodiment of the paper box of this invention with the cross section. It is explanatory drawing which showed typically 1st Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. (C) It is a bottom view. (D) It is a right view. It is explanatory drawing which showed typically the blank used for 1st Embodiment of the paper box of this invention. It is explanatory drawing which shows typically the state of the manufacture process of 1st Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. It is explanatory drawing which shows typically the next state of the manufacturing process of 1st Embodiment of the paper box of this invention by a plane. It is explanatory drawing which shows typically the next state of the manufacturing process of 1st Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. It is explanatory drawing which shows the state of the bonding piece of 1st Embodiment of the paper box of this invention. It is explanatory drawing which shows typically the further next state of the manufacture process of 1st Embodiment of the paper box of this invention on a front. It is explanatory drawing which shows typically the next state of the manufacturing process of 1st Embodiment of the paper box of this invention on a plane. It is explanatory drawing which showed typically 2nd Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. (C) It is a bottom view. (D) It is a right view. It is explanatory drawing which showed typically the blank used for 2nd Embodiment of the paper box of this invention. It is explanatory drawing which shows typically the state of the manufacture process of 2nd Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. It is explanatory drawing which shows typically the next state of the manufacturing process of 2nd Embodiment of the paper box of this invention by a plane. (A) It is a top view. (B) It is a front view. It is explanatory drawing which shows typically the next state of the manufacturing process of 2nd Embodiment of the paper box of this invention. (A) It is a top view. (B) It is a front view. It is explanatory drawing which shows the state of the bonding piece of 2nd Embodiment of the paper box of this invention. It is explanatory drawing which shows typically the further next state of the manufacture process of 2nd Embodiment of the paper box of this invention on a front. It is explanatory drawing which shows typically the next state of the manufacturing process of 2nd Embodiment of the paper box of this invention on a plane. It is explanatory drawing which shows typically the paper box of the comparative example 1 with a perspective view. It is explanatory drawing which shows typically the bottom face of the paper box of the comparative example 1. FIG. It is explanatory drawing typically shown by a plane.

<First Embodiment>
Hereinafter, a first embodiment for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing a first embodiment of the paper box of the present invention, and is (A) a plan view, (B) a front view, (C) a bottom view, and (D) a right side view. .
FIG. 2 is an explanatory view schematically showing a cross section of the laminated sheet used in the first embodiment of the paper box of the present invention.

  The paper box 100 of the first embodiment is formed of a paper layer 1 and a laminated sheet 4 as shown in FIG. 1 provided with thermoplastic resin layers 2 and 3 on at least the front and back surfaces. Another layer may be provided between the paper layer 1 and the thermoplastic resin layers 2 and 3. For example, a film having a barrier property such as a film of polyethylene terephthalate or ethylene vinyl acetate copolymer or an inorganic oxide vapor deposition film is provided between the paper layer 1 and the thermoplastic resin layer 2 or the thermoplastic resin layer 3. May be.

As the paper layer 1, a paperboard having a basis weight of 150 to 250 g / m ² is preferably used. The resin used for the thermoplastic resin layers 2 and 3 is preferably a polyethylene-based or polypropylene-based resin because it has good heat-fusibility and can be extruded and laminated, but is not limited thereto.

As shown in FIG. 2, the bottom plate 5, side wall plates 6 and 7 connected to the bottom plate 5, end wall plates 8 and 9 connected to the side walls 6 and 7, and an upper cover are provided. doing. The upper lid includes side wall side flaps 10 and 11 extending from the upper ends of the side wall plates 6 and 7, and overlaps each other to close the upper end opening.

  The side wall side flaps 10 and 11 have end wall side flaps (12, 13, 14, and 15) integrally extended to the left and right, respectively, and the end wall side flaps (12, 13, 14, and 15) are The wings 16, 16 are formed by being folded into a triangle, and are brought down to contact the end wall plates 8, 9.

  Although not visible in the figure, the end wall plates 8 and 9 are formed with a central crease a extending from the upper end of the end wall side flaps to the lower side of the end wall plate. Are provided with two creases b and c that extend inward and upward from both corners of the lower end and intersect at a certain point on the central crease a.

  Below the end wall plates 8, 9 are provided bottom side flaps 17, 18 that are folded in half to form substantially triangular bottom side wings 19, 19 that are bent and in contact with the outside of the bottom plate 5.

Hereinafter, in order to explain the details of the structure of the paper box of this embodiment, a manufacturing method will be described. FIG. 3 is an explanatory view schematically showing a blank used in the first embodiment of the paper box of the present invention.
4A and 4B are explanatory views schematically showing the state of the manufacturing process of the first embodiment of the paper box of the present invention, and are (A) a plan view and (B) a front view.
FIG. 5 is an explanatory diagram schematically showing a plan view of the next state of the manufacturing process of the first embodiment of the paper box of the present invention.
FIGS. 6A and 6B are explanatory views schematically showing the next state of the manufacturing process of the first embodiment of the paper box of the present invention, and are (A) a plan view and (B) a front view.
FIG. 7 is an explanatory view showing the state of the bonded piece of the first embodiment of the paper box of the present invention.
FIG. 8 is an explanatory view schematically showing the next state of the manufacturing process of the first embodiment of the paper box of the present invention in front.
FIG. 9 is an explanatory view schematically showing in plan a still further state of the manufacturing process of the first embodiment of the paper box of the present invention.

  The paper box 100 of this embodiment is manufactured by assembling a blank 101 as shown in FIG. 3 (for convenience of explanation, the blank is viewed from the back side). The blank 101 is provided with a bottom plate 5 at the center, and side wall plates 6 and 7 are provided above and below the bottom plate 5.

  Side wall side flaps 10 and 11 are provided on the side of the side wall plates 6 and 7 opposite to the bottom plate 5. End wall side flaps 12 and 13 are provided on the left side of the side wall side flaps 10 and 11, and end wall side flaps 14 and 15 are provided on the right side.

  On the left side of the side wall plates 6 and 7, an outer end wall plate 8a and an inner end wall plate 8b are provided. The end wall plate 8 is formed of a double wall in which the outer end wall plate 8a and the inner end wall plate 8b overlap each other. Further, the outer end wall plate 8a and the inner end wall plate 8b are also connected to end wall side flaps 12 and 13 connected to the side wall side flaps 10 and 11, respectively.

  A central crease a is provided at the left and right center from the end of the end wall side flaps 12 and 13 which are the upper end of the paper box to the outer end wall plate 8a and the inner end wall plate 8b. At the lower end of the end wall plate 8b as a paper box, there are provided two creases b and c that extend inward from both corners of the lower end and intersect at a certain point on the central crease a.

  Further, the end wall side flaps 12 and 13 are provided with triangular creases d and e for easy formation of the triangular wings 16 by bending.

  Similarly, an outer end wall plate 9a and an inner end wall plate 9b are provided on the right side of the side wall plates 6 and 7 as well. The end wall plate 9 is formed of a double wall in which the outer end wall plate 9a and the inner end wall plate 9b overlap each other. Further, the outer end wall plate 9a and the inner end wall plate 9b are also connected to end wall side flaps 14 and 15 that are connected to the side wall side flaps 10 and 11, respectively.

  A central crease a is provided at the left and right center from the end of the end wall side flaps 14 and 15 which are the upper end of the paper box to the outer end wall plate 9a and the inner end wall plate 9b. At the lower end of the end wall plate 9b as a paper box, there are provided two creases b and c that extend inward from both corners of the lower end and intersect at a certain point on the central crease a.

  Further, the end wall-side flaps 14 and 15 are provided with triangular creases d and e for facilitating the formation of the triangular wings 16 by bending.

  On the left and right sides of the bottom plate 5, bottom side flaps 17 and 18 are formed in a triangle connected to the outer end wall plate 8a or the outer end wall plate 9a. The bottom side flaps 17 and 18 are also provided with a ruled line f that bisects a triangle, and is folded in half to form a substantially triangular bottom side wing portion 19.

  And the end wall side bonding pieces 20 and 21 are provided in a row at the lateral ends of the inner end wall plates 8b and 9b. In addition, bottom side bonded pieces 22 and 23 are continuously provided on the upper side. The bottom surface side bonded pieces 22 and 23 are also connected to the bottom surface side flaps 17 and 18.

  In addition, it is preferable to provide other creases by crease because water or liquid food does not leak from the creases. However, the center crease a and the creases b, c provided on the outer end wall plates 8a, 9a are provided with inner end wall plates 8b, 9b on the inner side, and there is no risk of leakage. Since it folds, it may be provided with perforations or intermittent cuts that are easily broken, or may be a crease that is a combination of this and a stamp.

  In order to assemble the paper box 100 from the blank 101, first, a crease between the side wall plate 7 and the bottom plate 5 is folded, the side wall plate 7 is raised vertically from the bottom plate 5, and the inner end wall plates 8b and 9b are also formed. Fold inward so that it is perpendicular to the side wall plate 7.

  Then, the inner surfaces of the bottom surface side bonded pieces 22 and 23 are overlapped with the inner surfaces of the bottom surface side flaps 17 and 18. At this time, heat may be applied for fusion. Further, the end wall side bonded pieces 20, 21 are folded back to the outside. As a result, (A) plan view and (B) front view of FIG. 4 are obtained.

  Next, a crease between the side wall plate 6 and the bottom surface plate 5 is folded, and the side wall plate 6 is raised vertically from the bottom surface plate 5, and the end wall side bonded pieces 20, 21 as shown in the plan view of FIG. 5. Is overlapped with the inner surface of the outer end wall plate 8b or the outer end wall plate 9b. At this time, heat may be applied for fusion.

  Further, the end wall side flap 12 and the outer end wall plate 8a are folded inward, and the end wall side flap 12 is overlapped with the outer side of the end wall side flap 13, and the outer end wall plate 8a is overlapped with the outer side of the inner end wall plate 8b. At this time, the bottom side flap 17 is folded in two at the crease f and protrudes downward to form the bottom side wing part 19.

  Similarly, the end wall side flap 14 and the outer end wall plate 9a are folded inward, the end wall side flap 14 is overlapped on the outer side of the end wall side flap 15, and the outer end wall plate 9a is overlapped on the outer side of the inner end wall plate 9b. At this time, the bottom side flap 18 is folded in two at the crease f and protrudes downward to form the bottom side wing part 19. Thereby, the paper box 100 becomes like FIG. 6 (A) top view and (B) front view.

  The perspective view of FIG. 7 is a diagram for explaining the state of the bottom surface side bonded pieces 22 and 23 and the end wall side bonded pieces 20 and 21 in the paper box 100. In this way, the inner surfaces of the bottom surface side bonded pieces 22, 23 are overlapped with the inner surfaces of the bottom surface side flaps 17, 18, and the inner surfaces of the end wall side bonded pieces 20, 21 are overlapped with the outer end wall plate 8a or the outer end wall plate 9a. Stack on the inside.

  In this state, the outer end wall plate 8a and the inner end wall plate 8b, the end wall side flap 12 and the end wall side flap 13 and the bottom surface side flap 17 folded in two are heat-sealed, The outer end wall plate 9a and the inner end wall plate 9b, the end wall side flap 14 and the end wall side flap 15 and the bottom side flap 18 folded in two are heat-sealed. Since the paper sheet 100 uses the laminated sheet 4 provided with the paper layer 1 in the middle and the thermoplastic resin layers 2 and 3 on the front and back surfaces, it can be heat-sealed in this way.

  And as the structure which provided the end wall side bonding pieces 20 and 21 and the bottom face side bonding pieces 22 and 23, the end wall side bonding pieces 20 and 21 are respectively the outer end wall plate 8a and the inner end wall plate 8b. And sandwiched between the outer end wall plate 9a and the inner end wall plate 9b and heat-sealed, and the bottom-side bonded pieces 22 and 23 are sandwiched between the bottom-side flaps 17 and 18, respectively. Since the sheet layer 1 is not exposed at the end face of the laminated sheet 4 or exposed to the contents storage unit, and the body and bottom are watertight, Even if you put in, it will not leak.

  Then, as shown in the front view of FIG. 8, the bottom wings 19 and 19 formed by the bottom-side flap 17 folded in two and the bottom-side flap 18 folded in two are brought down, and the bottom plate 5 Tilt down along the outside and bond with an adhesive such as heat fusion or hot melt.

  The side wall side flaps 10 and 11 are tilted so as to overlap each other, the upper end opening is closed, the end wall side flap 12 and the end wall side flap 13 which are fused, and the end wall side flap 14 which is fused. The end wall side flap 15 is folded at the creases d and e to form the wing parts 16 and 16.

  And if this horizontal wing | blade part 16 and 16 is folded down and it is located in the state pressed by the end wall board 8 and 9, the upper end of the end wall side flaps 12, 13, 14, and 15 will be shown. The end wall plates 8a, 8b, 9a and 9b are bent inward by the central crease a extending downward from the end wall plates 8a, 8b, 9a and 9b, and the side wall plates 6 and 7 are close to each other. The side flaps 10 and 11 are closed and overlapped by the wings 16 pressed downward against the end wall plates 8a, 8b, 9a and 9b bent inward. Retained.

  Thus, when food to be cooked is stored and heated by a microwave oven, the upper end opening is kept closed, and a steaming effect is obtained. Further, when the generation of steam is extremely increased and the internal pressure is increased, the gap between the side wall side flaps is opened and the pressure is reduced, so that no explosion occurs.

<Second Embodiment>
Hereinafter, a second embodiment for carrying out the present invention will be described.
FIG. 10 is an explanatory view schematically showing a second embodiment of the paper box of the present invention, and is (A) a plan view, (B) a front view, (C) a bottom view, and (D) a right side view. .

  Similar to the paper box 100 of the first embodiment, the paper box 200 of the second embodiment is a laminated sheet in which a paper layer 1 and thermoplastic resin layers 2 and 3 are provided on at least the front and back surfaces as shown in FIG. 4 is formed. Another layer may be provided between the paper layer 1 and the thermoplastic resin layers 2 and 3. For example, a film having a barrier property such as a film of polyethylene terephthalate or ethylene vinyl acetate copolymer or an inorganic oxide vapor deposition film is provided between the paper layer 1 and the thermoplastic resin layer 2 or the thermoplastic resin layer 3. This is the same as the paper box 100 of the first embodiment.

  As shown in FIG. 10, a bottom plate 205, side wall plates 206 and 207 connected to the bottom plate 205, end wall plates 208 and 209 connected to the side wall plates 206 and 207, and an upper cover are provided. doing. The upper lid is configured such that the side wall side flaps 210 and 211 extending from the upper ends of the side wall plates 206 and 207 overlap each other to close the upper end opening.

  The side wall-side flap 210 has end wall side flaps (212, 213) that are integrally extended to the left and right, and the end wall side flaps (212, 213) are folded in a triangle so that the wings 216, 216 are formed. It is formed and tilted so as to contact the end wall plates 208 and 209.

  Although not visible in the figure, the end wall plates 208 and 209 are formed with a central crease g extending from the upper end of the end wall side flap to the lower side of the end wall plate, and further, the lower end portions of the end wall plates 208 and 209. Are provided with two creases h and i that extend inward and upward from both corners of the lower end and intersect at a certain point on the central crease g.

  Bottom face side flaps 217 and 218 are provided below the end wall plates 208 and 209, and are folded in two to form substantially triangular bottom wing portions 219 and 219, which are bent and are in contact with the outside of the bottom face plate 205.

Hereinafter, in order to explain the details of the structure of the paper box of this embodiment, a manufacturing method will be described. FIG. 11 is an explanatory view schematically showing a blank used in the second embodiment of the paper box of the present invention.
FIG. 12 is an explanatory view schematically showing the state of the manufacturing process of the second embodiment of the paper box of the present invention, and is an (A) plan view and (B) a front view.
FIGS. 13A and 13B are explanatory views schematically showing in plan the next state of the manufacturing process of the second embodiment of the paper box of the present invention, and are (A) a plan view and (B) a front view.
FIG. 14 is an explanatory view schematically showing the next state of the manufacturing process of the second embodiment of the paper box of the present invention, and is an (A) plan view and (B) a front view.
FIG. 15 is an explanatory view showing the state of the bonded piece of the second embodiment of the paper box of the present invention.
FIG. 16 is an explanatory view schematically showing the next state of the manufacturing process of the second embodiment of the paper box of the present invention on the front.
FIG. 17 is an explanatory view schematically showing in plan a still further state of the manufacturing process of the second embodiment of the paper box of the present invention.

  The paper box 200 of the present embodiment is manufactured by assembling a blank 201 as shown in FIG. 11 (for convenience of explanation, the blank is viewed from the back side). The blank 201 is provided with a bottom plate 205 at the center, and side wall plates 206 and 207 are provided above and below the bottom plate 205.

  Side wall side flaps 210 and 211 are provided on the side of the side wall plates 206 and 207 opposite to the bottom plate 205. An end wall side flap 212 is provided on the left side of the side wall side flap 210, and an end wall side flap 213 is provided on the right side. In addition, the side wall side flap 211 is provided with a knob portion 228 so as to be easily lifted when opened.

  On the left side of the side wall plates 206 and 207, an outer end wall plate 208a and an inner end wall plate 208b are provided. The end wall plate 208 is formed of a double wall in which the outer end wall plate 208a and the inner end wall plate 208b overlap. The outer end wall plate 208 a is also connected to an end wall side flap 212 that is connected to the side wall side flap 210. The inner end wall plate 208 b is also connected to an end wall sticking piece 224 that is connected to the side wall side flap 211.

  A central crease g is provided at the left and right center from the end of the end wall side flap 212 which is the upper end of the paper box to the outer end wall plate 208a, and a central crease g is also provided on the inner end wall plate 208b. Yes. At the lower end of the outer end wall plate 208a and the inner end wall plate 208b as a paper box, two creases h that extend upward and inward from both corners of the lower end and intersect at a certain point on the central crease g, i is provided.

  Further, the end wall side flap 212 is provided with triangular creases j and k for easy folding to form the triangular wings 216.

  Similarly, an outer end wall plate 209a and an inner end wall plate 209b are also provided on the right side of the side wall plates 206 and 207. The end wall plate 209 is formed of a double wall in which the outer end wall plate 209a and the inner end wall plate 209b overlap each other. Further, the outer end wall plate 209 a is also connected to an end wall side flap 213 that is connected to the side wall side flap 210. The inner end wall plate 209 b is also connected to an end wall sticking piece 225 that is connected to the side wall side flap 211.

  A central crease g is provided at the left and right center from the end of the end wall side flap 213 which is the upper end of the paper box to the outer end wall plate 209a, and a central crease g is also provided on the inner end wall plate 209b. Yes. At the lower end of the outer end wall plate 209a and the inner end wall plate 209b as a paper box, two creases h that extend upward and inward from both corners of the lower end and intersect at a certain point on the central crease g, i is provided.

  Further, the end wall side flap 213 is provided with triangular creases j and k for easy folding to form the triangular wings 216.

  On the left and right sides of the bottom plate 205, bottom side flaps 217 and 218 are formed in a triangle connected to the outer end wall plate 208a or the outer end wall plate 209a. The bottom side flaps 217 and 218 are also provided with a crease l that bisects a triangle, and is folded in two to form a substantially triangular bottom wing portion 219.

  And the end wall side bonding piece 220,221 is provided in a row by the edge part of the horizontal direction of the inner side end wall board 208b, 209b. Further, bottom side bonded pieces 222 and 223 are continuously provided on the upper side. The bottom surface side bonded pieces 222 and 223 are also connected to the bottom surface side flaps 217 and 218.

  Further, a cut line that serves as a crease between the end wall side flap 212 and the outer end wall plate 208a, between the side wall side flap 210 and the side wall plate 206, and between the end wall side flap 213 and the outer end wall plate 209a is connected. An easy cutting line 226 formed by being arranged in a straight line by being interrupted through the section is provided.

  Moreover, the cut | interruption which served as the crease between the end wall sticking piece 224 and the inner side end wall board 208b, between the side wall side flap 211 and the side wall board 207, and between the end wall sticking piece 225 and the inner side end wall board 209b. Are easily cut lines 227 which are formed by being arranged in a straight line by being intermittently connected via a connecting portion.

  In addition, it is preferable to provide other creases by crease because water or liquid food does not leak from the creases. However, for the center creases g and creases h and i provided on the outer end wall plates 208a and 209a, the inner end wall plates 208b and 209b are provided on the inner side, and there is no risk of leakage. Since it folds, it may be provided with perforations or intermittent cuts that are easily broken, or may be a crease that is a combination of these and a stamp.

To assemble the paper box 200 from the blank 201, first, the side wall plate 207 and the bottom plate 2
The side wall plate 207 is vertically raised from the bottom plate 205 and the inner end wall plates 208b and 209b are also folded inward so as to be perpendicular to the side wall plate 207.

  Then, the inner surfaces of the bottom surface side bonded pieces 222 and 223 are overlapped with the inner surfaces of the bottom surface side flaps 217 and 218. At this time, heat may be applied for fusion. Further, the end wall side bonded pieces 220 and 221 are folded outward. Thereby, (A) plan view and (B) front view of FIG. 12 are obtained.

  Next, a crease between the side wall plate 206 and the bottom surface plate 205 is folded, and the side wall plate 206 is vertically raised from the bottom surface plate 205, as shown in FIG. The inner surfaces of the end wall side bonded pieces 220 and 221 are overlapped with the inner surfaces of the outer end wall plate 208b and the outer end wall plate 209b. At this time, heat may be applied for fusion.

Further, the end wall side flap 212 and the outer end wall plate 208a are folded inward, and the outer end wall plate 8a is overlaid on the outer side of the inner end wall plate 8b. Further, the surface of the end wall sticking piece 224 overlaps the back surface of the end wall side flap 212.
At this time, the bottom side flap 217 is folded in two at the crease l and protrudes downward to form the bottom side wing 219.

Similarly, the end wall side flap 213 and the outer end wall plate 209a are folded inward, and the outer end wall plate 9a is overlaid on the outer side of the inner end wall plate 9b. Moreover, the surface of the end wall sticking piece 225 overlaps the back surface of the end wall side flap 213.
At this time, the bottom side flap 218 is folded in two at the crease l and protrudes downward to form a bottom side wing 219. Thereby, the paper box 200 becomes like FIG. 14 (A) top view and (B) front view.

  The perspective view of FIG. 15 shows a state in the middle of tilting the end wall side flap 213 and the outer end wall plate 209a inward. As described above, the inner surfaces of the bottom surface side bonded pieces 222 and 223 are overlapped with the inner surfaces of the bottom surface side flaps 217 and 218, and the inner surfaces of the end wall side bonded pieces 220 and 221 are overlapped with the outer end wall plate 208a or the outer end wall plate 209a. Stack on the inside. Further, the back surfaces of the end wall side flaps 212 and 213 are overlapped on the surfaces of the end wall sticking pieces 224 and 225.

  In this state, the outer end wall plate 208a and the inner end wall plate 208b, the end wall side flap 212 and the end wall sticking piece 224, and the bottom surface side flap 217 folded in two are heated and fused, and The outer end wall plate 209a and the inner end wall plate 209b, the end wall side flap 213 and the end wall sticking piece 225, and the bottom surface side flap 18 folded in two are heat-sealed. Thus, since the laminated sheet 4 provided with the paper layer 1 in the middle and the thermoplastic resin layers 2 and 3 on the front and back surfaces is used, it can be heat-sealed.

  And as the structure which provided the end wall side bonding pieces 220 and 221 and the bottom face side bonding pieces 222 and 223, the end wall side bonding pieces 220 and 221 are respectively the outer end wall plate 208a and the inner end wall plate 208b. And sandwiched between the outer end wall plate 209a and the inner end wall plate 209b and heat-sealed, and the bottom-side bonded pieces 222 and 223 are sandwiched between the bottom-side flaps 217 and 218, respectively. Because it is heat-sealed, it will not leak even if water or liquid is added.

  Next, as shown in the front view of FIG. 16, the bottom side wings 19 and 19 formed by the bottom-side flap 17 folded in two and the bottom-side flap 18 folded in two are connected to the outside of the bottom plate 5. And are adhered with an adhesive such as heat fusion or hot melt.

  The side wall side flaps 211 and 211 are folded down so that the side wall side flaps 210 and 211 overlap each other so that the side wall side flaps 211 are on the upper side, the upper end opening is closed, and the fused end wall side flaps 212 and The end wall side flap 213 is folded at the creases j and k, and the wing portions 216 and 216 are formed as shown in the plan view of FIG.

  And if this horizontal wing | blade part 216,216 is folded down and it is located in the state pressed by the end wall board 208,209, end wall side flap 212,213, or an outer side end wall board The end wall plates 208 and 209 can be bent inward and the side wall plates 206 and 207 can be brought close to each other by the central crease g provided on 208a and 209a and the inner end wall plates 208b and 209b. The side flaps 210 and 211 are held in a state where the upper end openings are closed and overlapped by the wings 216 pressed downward with respect to the end wall plates 208 and 209.

  Thus, when food to be cooked is stored and heated by a microwave oven, the upper end opening is kept closed, and a steaming effect is obtained. Further, when the generation of steam is extremely increased and the internal pressure is increased, the gap between the side wall side flaps is opened and the pressure is reduced, so that no explosion occurs.

  Moreover, since the easy-cut lines 226 and 227 are provided, after cooking with a microwave oven, the easy-cut lines 226 and 227 are cut | disconnected and the side wall side flaps 210 and 211 or the end wall side flaps 212 and 213 above this are cut | disconnected. If the above is removed, the paper box 200 used for cooking can be eaten as it is as tableware.

  Specific examples of the present invention will be described below.

<Example 1>
A paper board having a basis weight of 230 g / m ² is used as the paper layer 1, and a low-density polyethylene 30 μm of the thermoplastic resin layer 2 is laminated on the outer surface side, and a polyethylene terephthalate film 12 μm is laminated on the inner surface side of the thermoplastic resin layer 3. A laminate film was prepared by laminating a laminate film of 55 μm of low density polyethylene.

  Using this laminated sheet, the paper box 100 of the first embodiment having a box size of 100 mm in width, 80 mm in depth, and 100 mm in height was created and used as a container of Example 1.

<Example 2>
Using the same laminated sheet as in Example 1, the paper box 200 of the second embodiment having a box size of 122 mm in width, 92 mm in depth, and 62 mm in height was created and used as a container in Example 2.
Hereinafter, comparative examples of the present invention will be described.

<Comparative Example 1>
Using the same laminated sheet as in Example 1, the box size is 100 mm in width, 80 mm in depth, and 100 mm in height, the body is formed into a cylinder with a sack, and the bottom is pre-bonded so that it can be folded. A paper box as shown in FIG. 18 having a one-touch bottom structure as shown in FIG.

<Comparative example 2>
A container made of a commercially available plastic tray and a molding lid was used as the container of Comparative Example 2.

<Comparative Example 3>
A container composed of a commercially available composite paper container with polyethylene and a sheet-like seal lid was used as the container of Comparative Example 3.

<Comparison evaluation>
The following items were evaluated for Examples 1 and 2 and Comparative Examples 1 to 3 produced as described above.

<Waterproof>
200 cc of water was placed in the containers of Examples and Comparative Examples, and allowed to stand for 10 minutes, and visually checked for water leakage.

  Evaluation was made with ○ indicating that there was no water leakage after standing, and × indicating that there was water leakage. The results are shown in Table 1.

<Water resistance>
200 cc of water was placed in the containers of Examples and Comparative Examples, and allowed to stand for 10 minutes, and whether or not water had entered the sheet material such as a paper layer was visually checked.

  Evaluation was made with ○ indicating that there was no water intrusion after standing, and × indicating that there was water intrusion. The results are shown in Table 1.

<Insulation>
200 cc of water was placed in the containers of Examples and Comparative Examples, heated for 2 minutes in a 500 W microwave oven, and then the heat at the time of removal was compared by sensory sense.

  The evaluation was evaluated as “◯” when it was held by hand and not hot, and “X” when it was too hot to hold by hand. The results are shown in Table 1.

<Resealing>
200 cc of water was put into the containers of Examples and Comparative Examples, and the degree of ease of tightening when closing the upper part was compared by sensory sense.

  Evaluation was made with ○ for those that were easy to close, and × for those that were difficult to close. The results are shown in Table 1.

<Range aptitude>
200 cc of water was placed in the containers of Examples and Comparative Examples, and after heating for 3 minutes in a 500 W microwave, the containers were visually checked for deterioration and deformation.

  The case where there was no deterioration / deformation was evaluated as ◯, and the case where there was deterioration / deformation was evaluated as x. The results are shown in Table 1.

<Automatic vapor transmission>
200 cc of water was put into the containers of Examples and Comparative Examples, and it was checked whether steam escaped without significant deformation of the containers during heating for 3 minutes in a 500 W microwave oven.

  When the steam escaped as prescribed during heating and the container was not significantly deformed, the evaluation was evaluated as ◯, and the others were evaluated as ×. The results are shown in Table 1.

<Steaming effect>
200 cc of water was placed in the containers of Examples and Comparative Examples, and whether or not steam escaped from the container for 30 seconds or more during heating for 3 minutes in a 500 W microwave oven was visually checked using the degree of cloudiness in the microwave oven as a guide.

  The evaluation was evaluated as ○ when the cloudiness of the microwave oven was less than 30 seconds, and as × when the cloudiness was 30 seconds or more. The results are shown in Table 1.

<Printing and decoration>
It was compared and evaluated whether it can be decorated by gravure printing and offset printing, and whether a large printing area can be taken.

  The items that could be decorated by gravure printing or offset printing and had a relatively large printing area were evaluated as ◯, and the others were evaluated as ×. The results are shown in Table 1.

<Comparison result>
The container made of the paper box of the present invention of Example 1 and Example 2 was good in any evaluation item. Moreover, in the container of the paper box of Example 2, since there is a knob part after cooking in a microwave oven, the upper lid is easy to open, and an easy cutting line is provided, so that the upper part is opened by cutting it. It was possible to use it as a tableware in a container cooked in a microwave oven.

  On the other hand, the container of the paper box of Comparative Example 1 had good printing / decorating properties and resealability of ease of tightening when the top was closed, but when water was added, water leaked from the bottom, When water penetrated into the paper layer of the sheet in this part and heated with a microwave oven, the other parts were inferior, such as the part where water entered got hot and the container was deformed.

  The container of Comparative Example 2 was inferior because it did not have heat insulating properties and automatic steaming properties, a steaming effect was not obtained, and printing and decoration properties were difficult to print. In the container of Comparative Example 3, there was no resealability, no automatic steaming, and no steaming effect was obtained.

  As described above, the paper box of the present invention can be easily closed with the lid open by hand, but does not open unless a certain amount of force is applied, and has a steaming effect with microwave heating, It is water-resistant and does not leak even if water or liquid is added, or food that drip by heating is added.

  And after cooking with a microwave oven, it can also be taken out with the wings, and the generated water vapor will be caught in your hands and you will never feel hot. Further, before the thermoplastic resin layer 2 is provided, cosmetic printing can be performed on the paper layer 1 by offset printing or the like, and the decoration is high.

  For this reason, the paper box of the present invention is suitable for cooking such as curry, stew, cooked rice, mixed rice, cooked rice, oden, meat potato and hot pot. In particular, it can be used as an exterior of a seasoning liquid for cooking with a microwave oven by adding cooking materials such as meat and vegetables at home, and also as a cooking container. Further, when it is discarded after use, it is easy to reduce the volume, and furthermore, it can cope with paper recycling.

100, 200 ... paper box 101, 201 ... blank 1 ... paper layer 2, 3 ... thermoplastic resin layer 4 ... laminated sheet 5, 205 ... bottom plate 6, 7, 206, 207 ... Side wall plates 8, 9, 208, 209 ... End wall plates 8a, 9a, 208a, 209a ... Outer end wall plates 8b, 9b, 208b, 209b ... Inner end wall plates 10, 11 , 210, 211 ... side wall side flaps 12, 13, 14, 15, 212, 213 ... end wall side flaps 16, 216 ... wing parts 17, 18, 217, 218 ... bottom side flaps 19 219 ... bottom side wings 20, 21, 220, 221 ... end wall side bonded pieces 22, 23, 222, 223 ... bottom side side bonded pieces 224, 225 ... end wall attached pieces 226, 227 ... easy cutting line 228 ... knob part a, ... center Orikei b, c, d, e, f, h, i, j, k, l ··· Orikei

Claims (3)

A bottom layer, a side wall plate connected to the bottom plate, an end wall plate connected to the side wall plate, and an upper lid, formed from a laminated sheet having a thermoplastic resin layer on the front and back surfaces of the paper layer And
The upper lid includes a side wall side flap that extends from an upper end of the side wall plate and overlaps each other to close the upper end opening, and an end wall side flap that is integral with the side wall side flap. A triangular wing that can be bent downward so as to be pressed against the end wall plate, and the end wall plate has an upper end from the upper end of the end wall side flap to the lower side of the end wall plate. An extending central crease is formed, whereby the end wall plate can be bent inward to form a recess, and when the wing is bent downward in the direction of the end wall plate beyond the horizontal line, The end wall plates can be bent inwardly, and the side wall plates can be brought close to each other, and the side wall side flaps are at the upper end by wings pressed downward against the end wall plates bent inwardly. Close and overlap openings A carton which is held in a state,
The end wall plate is a double wall of an inner end wall plate extended to one of the side wall plates and an outer end wall plate extended to the other side wall plate, and the outer end wall plate and the The bottom plate has a substantially triangular bottom side flap with two sides connected to the bottom plate, the bottom side flap is folded in two to form a substantially triangular bottom side wing, and is bent downward to contact the outside of the bottom plate, The inner end wall plate is continuously provided with an end wall side bonded piece and a bottom surface side bonded piece, the end wall side bonded piece is folded and fused between the outer end wall plate, The paper box, wherein the bottom-side bonded piece is fused while the bottom-side flap is folded in half.   2. The paper box according to claim 1, wherein the end wall side flap is preliminarily provided with a triangular crease so that the triangular wing portion is easily formed when the side wall side flap is folded together. .   2. The lower end portion of the end wall plate is provided with two creases extending respectively upward and inward from both corners of the lower end and intersecting at a certain point on the central crease. The paper box according to 1 or 2.

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