JP5743618B2 - Paper container with flange - Google Patents

Description

  The present invention relates to a paper container used for packaging frozen food, powdered food, etc., and to a flanged paper container having a flange integrally on the outer periphery of an opening so that a cover plate can be attached. is there.

  Conventionally, there is a tray-like flanged paper container having a top surface opening from a single blank having a shape as disclosed in Patent Document 1, and this is covered with a paper cover plate and the periphery of the cover plate. By heat-sealing the flange, it is used for packaging frozen foods and the like.

  As shown in FIG. 4, in the blank capable of assembling the flanged paper container, a side plate 12 is connected to two opposite sides of a rectangular bottom plate 11 via a mountain fold line. Edge pieces 13 are connected to the outer side opposite to the bottom plate 11 via valley fold lines, and the left and right ends of the edge pieces 13 (ends facing the length direction of the edge pieces) Tongue pieces 131 each extending in the lateral direction (length direction of the edge piece) are provided. The left and right side sides (sides facing the width direction of the side plate) of the side plate 12 are respectively connected to a folded joining plate 121 having an inverted triangular shape via a mountain fold line, and the bottom plate 11 of the folded joining plate 121 is connected. A joining edge piece 122 is connected to the outer side opposite to the bottom via a valley fold line, and this joining edge piece 122 forms the same plane as the tongue piece 131 through a notch. .

  The incision end of the notch that separates the joining edge piece 122 and the tongue piece 131 includes a mountain fold line on the side of the side plate 12, a valley fold line on the outer side of the side plate 12, and a valley fold line on the outer side of the fold joint plate 121. (See FIG. 5), the tongue piece 131 is separated from the joining edge piece 122 and the folded joining plate 121 during box making as will be described later.

  In addition, the second side plate 14 is connected to the other two opposite sides of the bottom plate 11 via a mountain fold line, and the second side plate 14 has an outer side opposite to the bottom plate 11. The second edge piece 15 is connected via a valley fold line, and the left and right ends of the second edge piece 15 (ends facing the longitudinal direction of the second edge piece) are respectively lateral (second edge). A second tongue piece 151 extending in the longitudinal direction of the piece is provided. The left and right side edges (sides facing the width direction of the second side face plate) of the second side face plate 14 are connected to an inverted triangular second folding joining plate 141 via a valley fold line, respectively.

  Further, with respect to the fold joint plate 121 and the second fold joint plate 141 located between the adjacent side plate 12 and the second side plate 14, the side of the fold joint plate 121 opposite to the side plate 12. And the side of the second folded joint plate 141 opposite to the second side plate 14 are connected via a mountain fold line. Further, a small protrusion 152 protruding toward the second folding joint plate 141 is provided at an edge of the second tongue piece 151 in the vicinity where the second folding joint plate 141 comes into contact. The two-fold joint plate 141 forms the same plane through a cut.

  As will be described later, the notch between the small protrusion 152 and the second folding joint plate 141 is the portion where the small protrusion 152 is located on the set point A on the tongue piece 131 side (the notch end of the tongue piece 131 is located). ) In order to make the shape capable of covering the set point A, the set point B of the valley fold line on the side of the second side plate 14 and the valley fold line on the outer side of the second side plate 14. It is closer to the bottom plate 11 side, and the cut end reaches the portion that is bent at the valley fold line on the side of the second side plate 14 (see FIG. 5).

  In order to obtain a paper container with a flange from the blank, the side plate 12 and the second side plate 14 are folded to form a tray, and the folding joint plate 121 and the second folding joint plate 141 are the folding joint plate 121 and the second folding plate 121. The inner surfaces are bonded to each other by folding the mountain at the position of the mountain fold line between the folded joint plate 141. Next, in a state where the folding and joining plate 121 and the second folding and joining plate 141 are overlapped by the adhesion, the second side and side plates 14 are arranged so that the second folding and joining plate 141 faces the outer surface of the second side and side plate 14. The edge piece 13, the second edge piece 15, and the joining edge piece 122 are each folded into a valley, and the joined folded joining plate 121 and the second folded joining plate 141 are overlapped on the second side plate 14. By matching, the upper surface of the joining edge piece 122 and the lower surface of the second edge piece 15 face each other, the upper surface of the joining edge piece 122 and the lower surface of the second edge piece 15 are bonded, and the side plate 12 and the second side plate 14 are bent so that the sides are aligned with each other, the upper surface of the tongue piece 131 and the lower surface of the second tongue piece 151 are opposed to each other. The bottom surface of the bilingual piece 151 and Have adhered, the upper surface in this way are assembled is a tray-shaped paper containers with opening (see FIGS. 6 and 7).

  In the boxed paper container, the bottom plate 11, the four side plates 12, and the second side plate 14 are each formed with an accommodating portion having an upper opening with an upper surface as an opening, and around the opening. The outer edge of the side plate 12 and the edge piece 13 and the second edge piece 15 that are valley-folded from the outer side of the second side face plate 14 are positioned, and the second edge is formed on the upper surface of the tongue piece 131 of the edge piece 13. The flange which the said edge piece 13 and the 2nd edge piece 15 continue is formed by the piece 15 being located and adhere | attaching as mentioned above.

  And the cut lower end of the tongue piece 131 has reached the set point A, and it has a structure in which fine through holes are likely to occur at the set point A in the form of a paper container, and the second tongue piece 151 has a protruding shape. The purpose of providing the small protrusion 152 is to cover the small protrusion 152 so as to straddle the end of the valley fold line between the edge piece 13 and the side plate 12, and to fill the contents and attach the cover plate. After that, the contents were prevented from leaking out from the fine through holes at the meeting point A.

  The material used for the blank may be paperboard such as coated balls, coated manila, and ivory that are generally used for paper boxes. However, if the contents contain a lot of water such as frozen food, A polyethylene processed paper in which a polyethylene resin is applied to at least the inner surface by a melt extrusion method can be preferably used. In view of the fact that polyethylene is advantageous for joining when assembled in a tray, it is desirable to use a processed paper in which a thermoplastic resin such as polyethylene resin is applied to both sides of the blank.

  And the box making of the paper container with a flange mentioned above performed the bending in the fold line position of a blank using an assembly raising apparatus, and the adhesion | attachment in a required part was performed by the heat seal.

Japanese Patent No. 3687396

  However, when the flanged paper container is assembled by the raising device, the side plate and the second side plate around the bottom plate are folded from the position of the mountain fold line. And the end of the second edge on the second side plate approach each other, the second tongue that is the end of the second edge contacts the other edge, and the side plate is bent There is a problem of being regulated without passing (FIG. 8). Then, the assembly of the paper container proceeds in a state where the upper part of the fold line at the side of the side plate and the upper part of the valley fold line at the side of the second side plate do not overlap each other, and at the required position of the blank Heat sealing is performed (FIG. 9). As a result, the small projections located on the second side plate side are in a state of floating away from the assembly point, and it is difficult to prevent leakage of contents from the fine through holes at the assembly point A. It cannot be solved.

  In addition, as described above, although the small protrusion extends over the side plate and the edge piece, since the small protrusion is small, the bend at the valley fold line between the side plate and the edge piece (outside It was not possible to follow the valley fold when viewed from the side, and the curve was small. For this reason, even when heat sealing is performed with a cover plate, heat sealing is properly performed between the small protrusions that are slightly raised without properly overlapping the upper surface of the tongue piece and the periphery of the cover plate that is superimposed on it. Is not performed and a gap is likely to occur. As a result, it is impossible to solve the problem that it is difficult to prevent leakage of the contents from the fine through-holes as described above because the folding is not appropriate at the gathering point where the cut ends have reached.

  In view of the above circumstances, an object of the present invention is to prevent a fine through-hole from being generated at the assembly point where the cut end of the tongue piece has reached, and in the container to which the cover plate is attached, from the assembly point portion to the outside. It is an object of the present invention to provide a container whose contents are difficult to leak out.

The present invention has been made in consideration of the above problems, and a side plate is connected to two opposite sides of a square bottom plate via a mountain fold line, respectively, and the side plate is opposite to the bottom plate. Edge pieces are connected to the outer side via valley fold lines, tongue pieces extending in the lateral direction are provided on the left and right ends of the edge pieces, and mountain fold lines are provided on the left and right sides of the side plate, respectively. Inverted triangular folded joint plates are connected via, and the outer edge on the opposite side to the bottom plate of the folded bonded plate is joined with joint edge pieces via valley fold lines,
A second side plate is connected to the other two opposite sides of the bottom plate via a mountain fold line, and a valley fold line is formed on the outer side of the second side plate opposite to the bottom plate. The second edge pieces are connected to each other, and second tongue pieces extending in the lateral direction are provided at the left and right ends of the second edge pieces, respectively, and the left and right sides of the second side plate are respectively connected via valley fold lines. The inverted triangular second folding joint plate is connected,
The side opposite to the side plate of the folded joint plate and the side opposite to the second side plate of the second folded joint plate are connected via a mountain fold line , and both sides are heated. A paper container formed by assembling a blank having a sealing property ,
Each side plate is folded and assembled into a tray, and the folded joint plate and the second folded joint plate are overlapped and bonded, and the two joined plates are folded to the outer surface side of the second side plate. Superimposed,
The edge piece, the second edge piece, and the joining edge piece are each folded in a valley, and the upper surface of the joining edge piece and the second edge are opposed by overlapping the two joining plates on the second side plate. A flanged paper container in which the lower surface of the piece is bonded, the upper surface of the tongue piece and the lower surface of the second tongue piece are bonded, and a flange is formed in which the edge piece and the second edge piece are continuous. In
The position of the edge extending from the protruding end of the second tongue piece to the second side plate side is biased outward with respect to the extension line of the valley fold line of the second edge piece, and the second tongue piece tip is, they correspond located outside the straight sides of at opposite edges piece when the side plates in assembled blank is to put folded,
The end of the second tongue piece on the second side plate side is integrally provided with a protruding convex piece, and the convex piece is only on the heat seal region of the edge piece where the tongue piece is continuous. A flanged paper container characterized by being positioned is provided to solve the above problems.

  According to the invention of claim 1, the position of the edge extending from the protruding end of the second tongue piece to the second side plate side is biased outward with respect to the extension line of the valley fold line of the second edge piece. The protrusion of the second tongue piece is provided so as to be positioned corresponding to the vicinity of the outer edge of the opposite edge piece when the side plate is folded over in the blank assembling. When the side plate and the second side plate around the face plate are bent, the second tongue piece comes into contact with the edge piece on the side plate side, and the valley fold of the tongue piece with respect to the side plate is likely to occur. For this reason, the bending of the side plate is not restricted, and the upper part of the side fold line of the side plate (the set point A) and the upper part of the side fold line of the second side plate (the set point B) Will overlap properly.

  Then, the second tongue piece is formed on the upper surface of the tongue piece for flange formation in a state where the upper portion of the side fold line of the side plate and the upper portion of the valley fold line of the second side plate are properly overlapped. As described above, even if a minute through-hole is generated at the above-mentioned gathering point A where the cut end of the tongue piece extends, the gathering point A is It becomes a shape covered with the part of the gathering point B which is the upper part of the valley fold line on the side of the two side plates, and there is an effect that leakage from fine through holes can be prevented.

Moreover , since the convex piece united with the 2nd tongue piece is located only on the heat seal area | region of an edge piece, a convex piece will overlap with the edge piece upper surface appropriately. Therefore, when the lid material is overlapped and heat sealing is performed, this convex piece is densely overlapped with the upper surface of the edge piece, and the upper part of the side fold line (aggregation point A) and the second side of the side plate. Appropriate overlap with the upper part (aggregation point B) of the valley fold line on the side of the side plate is easily obtained, and the effect of suppressing leakage of contents from the fine through holes is further improved. Further, the convex piece is appropriately surface-bonded with the lid plate to be heat sealed, and there is an effect that it is possible to reliably prevent a gap from being generated between the lid plate and the convex piece.

It is explanatory drawing which shows embodiment of the paper container with a flange which concerns on this invention with a blank. It is explanatory drawing which expands and shows the principal part of embodiment. It is explanatory drawing which shows an example of embodiment. It is explanatory drawing which shows the conventional form with a blank. It is explanatory drawing which expands and shows the principal part of the conventional form. It is explanatory drawing shown in the state which looked at the conventional form from diagonally upward. It is explanatory drawing shown in the state which looked at the conventional form from diagonally downward. It is explanatory drawing which shows the state which the 2nd tongue piece in the conventional form contact | abutted to the edge piece. It is explanatory drawing which shows the malfunction which the collection point in the conventional form does not align.

Next, the present invention will be described in detail based on the embodiment shown in FIGS.
First, the blank which obtains the paper container 1 with a flange of this invention is demonstrated. FIG. 1 shows this blank, and a side plate 12 is connected to two opposite sides of a square bottom plate 11 via a mountain fold line, and the side plate 12 is opposite to the bottom plate 11. The edge piece 13 which is a structural member of the flange is connected to the outer side which is a through a valley fold line. The left and right ends of the edge piece 13 (ends facing the longitudinal direction of the edge piece 13) are respectively provided with tongue pieces 131 extending in the lateral direction (edge piece longitudinal direction).

  The left and right sides of the side plate 12 (sides facing the width direction of the side plate in the container form) are connected to each other through an inverted triangular fold joint plate 121 via a mountain fold line, and the bottom of the fold joint plate 121 is connected. A joining edge piece 122 is connected to the outer side opposite to the face plate 11 via a valley fold line.

  As in the conventional example described above, the joining edge piece 122 forms the same plane as the tongue piece 131 through the notch. The cut end of the notch that separates the tongue piece 131 from the joining edge piece 122 and the folded joining plate 121 is folded into the mountain fold line on the side of the side plate 12 and the valley fold line on the outer side of the side plate 12. It reaches the set point A with the valley fold line on the outer side of the plate 121. This cutting is the same as the conventional example described above in that the tongue piece 131 is separated from the joint edge piece 122 and the folded joint plate 121 during box making.

  Further, the second side plate 14 is connected to the other two opposite sides of the bottom plate 11 through mountain fold lines, respectively, and the outer side of the second side plate 14 opposite to the bottom plate 11 is connected. A second edge piece 15, which is a component member of the flange, is connected to the side via a valley fold line. A second tongue piece 151 extending in the lateral direction (longitudinal direction of the second edge piece 15) is provided on the left and right ends of the second edge piece 15 (ends facing the longitudinal direction of the second edge piece 15). Yes.

  In each of the second tongue pieces 151, as shown in FIG. 2, the outer side is made arcuate and the inner side is made straight. And the position of the linear edge 151b which faces the 2nd side plate 14 side from the protrusion 151a of the 2nd tongue piece 151 is set to the outward side with respect to the extension line of the said valley fold line of the 2nd edge piece 15. It is biased to. And the position of the said protrusion 151a is made on the line 15a which passes through the substantially intermediate | middle position in the direction orthogonal to the length direction in the 2nd edge piece 15, When a side plate 12 is folded up by assembling a blank. It is provided so as to correspond to the outer side vicinity portion 13a at the opposing edge piece 13.

  In this way, the end edge 151b of the second tongue piece 151 on the second side face plate 14 side is biased outward, and the position of the protruding end 151a corresponds to the outer side vicinity 13a at the edge piece 13 when the blank is folded. Since the second tongue piece 151 comes into contact with the edge piece 13 on the side plate 12 side when assembling from the blank, valley folding of the tongue piece 13 with respect to the side plate 12 is likely to occur. Become. Therefore, the bending of the side plate 12 is not restricted, and the upper part of the side fold line of the side plate 12 and the upper part of the side fold line of the second side plate 14 come close to each other so that they overlap appropriately. It becomes like this.

  And the upper part of the side fold line on the side plate 12 and the upper part of the valley fold line on the side side of the second side plate 14 are properly overlapped (the set point B overlaps the set point A). If the second tongue piece 151 of the second edge piece 15 is overlapped with the upper surface of the tongue piece 131 of the folded edge piece 13 and heat sealing is performed, at the set point A at which the cut end of the tongue piece 131 extends. Even if fine through holes are formed, this portion is covered with the portion of the set point B that is the upper portion of the valley fold line on the side of the second side plate 14.

  Furthermore, the convex piece 16 is integrally provided in the edge part by the side of the 2nd side plate 14 of each 2nd tongue piece 151, This convex piece 16 is the 2nd side plate 14 of the 2nd tongue piece 151 like illustration. It protrudes from the edge part of the side in the shape of a substantially square. And this convex piece 16 is provided so that it may be located only on the upper surface of the edge piece 13 in which the said tongue piece 131 continues after box making, and between the side plate 12 and its edge piece 13 is provided. It is provided so as not to bend at the bent portion of the valley fold line.

  Since both sides of the packaging material constituting the blank are thermoplastic resin layers having heat sealing properties, if heat sealing is performed with the upper surface of the edge piece 13 and the lower surface of the convex piece 16 facing each other, the edge piece 13 The convex piece 16 is adhered within the heat seal region. And in this case, since the convex piece 16 does not straddle the part of the valley fold line between the side plate 12 and the edge piece 13, the convex piece 16 is adhered to the edge piece 13 in a flat state.

  The assembly for obtaining the flanged paper container 1 from the blank is the same as that of the prior art, and is performed as follows. That is, the side plate 12 and the second side plate 14 are folded and assembled in a tray shape, and the inner surfaces of the folded joint plate 121 and the second folded joint plate 141 are bonded to each other. Then, the folded and joined plate 121 and the second folded and joined plate 141 are bent to the second side plate 14 side. At the same time, the edge piece 13, the second edge piece 15, and the joining edge piece 122 are each folded in a valley and joined by superimposing the adhered folding joining plate 121 and the second folding joining plate 141 onto the second side plate 14. The upper surface of the edge piece 122 and the lower surface of the second edge piece 15 that overlaps the upper surface of the edge piece 122 face each other, heat-seal the opposite joining edge piece 122 and the second edge piece 15, and the side plate 12 and the second edge piece 15. The upper surface of the tongue piece 131 and the lower surface of the second tongue piece 151 are opposed to each other by bending with the side plate 14, and the tongue piece 131 and the second tongue piece 151 are heat-sealed. A flange 17 formed continuously with the second edge piece 15 is formed, and the flanged paper container 1 is assembled (FIG. 3).

  At each corner of the flange 17 of the flanged paper container 1, the edge 151 b is biased outwardly on the tongue piece 131, and the protruding end 151 a is made to correspond to the outer side vicinity portion 13 a of the edge piece 13. The tongue piece 151 is overlapped and bonded by heat sealing, and as described above, the second side plate 14 is placed at the set point A that is the upper portion of the mountain fold portion at the mountain fold line position on the side of the side plate 12. Thus, a paper container is obtained in which the set point B, which is the upper part of the valley fold portion at the position of the valley fold line on the side, is densely overlapped. Further, the convex piece 16 is bonded to the upper surface of the edge piece 13 by heat sealing at the time of heat sealing at the time of flange formation in the flanged paper container 1, and as described above, the edge is not applied to the side plate 12 side. The flanged paper container 1 is assembled only in the heat seal surface area of the plate 13.

  In this way, the portion of the set point B on the second side plate 14 side appropriately corresponds to the set point A, and the convex piece 16 is appropriately overlapped and bonded to the upper surface of the edge piece 13. In addition, the fine through holes at the conventional gathering point A are difficult to occur, and even if they occur, the fine through holes are covered with the portion of the gathering point B, and the contents are filled with the cover plate. After the heat-sealed product is applied, the contents will not leak from the gathering point A to the outside.

  In addition, it is also possible to superimpose the said convex piece 16 on the upper surface of the edge piece 13 in the non-heat-sealed state at the time of the assembly of the paper container 1 with a flange. Then, as described above, the contents are filled and covered with a cover plate. When the periphery of the cover body and the flange 17 of the flanged paper container 1 are heat sealed, the positions corresponding to the convex pieces 16 are also heated. If pressure is applied and heat sealing is performed, the convex piece 16 is more effective because it has the effect of tightening around the gathering point A while being crushed, and the generation of fine through holes can be more reliably prevented. Moreover, it is also possible to slightly increase the width of the outer side that becomes the valley fold line of the second side plate 14 that is in contact with the second edge piece 15, and in this way, the side of the side plate 12. The mountain fold line and the valley fold line on the side of the second side plate 14 can be more closely overlapped, which is even more effective in enhancing the effect of preventing leakage of the contents.

DESCRIPTION OF SYMBOLS 1 ... Paper container with a flange 11 ... Bottom plate 12 ... Side plate 121 ... Folding joining plate 122 ... Joining edge piece 13 ... Edge piece 131 ... Tongue piece 13a ... Outer edge vicinity part 14 ... Second side board 141 ... Second folding joining Plate 15 ... second edge piece 151 ... second tongue piece 151a ... protruding end 151b ... straight edge 152 ... small protrusion 16 ... convex piece 17 ... flange A ... set point B ... set point

Claims (1)

A side plate is connected to two opposite sides of the rectangular bottom plate via a mountain fold line, and an edge piece is formed on the outer side of the side plate opposite to the bottom plate via a valley fold line. Are connected to the left and right ends of the edge pieces, respectively, and the left and right sides of the side plates are connected to the left and right sides of the side plates, respectively, via inverted fold lines, respectively. The outer edge on the opposite side to the bottom plate of the folded joint plate is joined with a joining edge piece via a valley fold line,
A second side plate is connected to the other two opposite sides of the bottom plate via a mountain fold line, and a valley fold line is formed on the outer side of the second side plate opposite to the bottom plate. The second edge pieces are connected to each other, and second tongue pieces extending in the lateral direction are provided at the left and right ends of the second edge pieces, respectively, and the left and right sides of the second side plate are respectively connected via valley fold lines. The inverted triangular second folding joint plate is connected,
The side opposite to the side plate of the folded joint plate and the side opposite to the second side plate of the second folded joint plate are connected via a mountain fold line , and both sides are heated. A paper container formed by assembling a blank having a sealing property ,
Each side plate is folded and assembled into a tray, and the folded joint plate and the second folded joint plate are overlapped and bonded, and the two joined plates are folded to the outer surface side of the second side plate. Superimposed,
The edge piece, the second edge piece, and the joining edge piece are each folded in a valley, and the upper surface of the joining edge piece and the second edge are opposed by overlapping the two joining plates on the second side plate. A flanged paper container in which the lower surface of the piece is bonded, the upper surface of the tongue piece and the lower surface of the second tongue piece are bonded, and a flange is formed in which the edge piece and the second edge piece are continuous. In
The position of the edge extending from the protruding end of the second tongue piece to the second side plate side is biased outward with respect to the extension line of the valley fold line of the second edge piece, and the second tongue piece tip is, they correspond located outside the straight sides of at opposite edges piece when the side plates in assembled blank is to put folded,
The end of the second tongue piece on the second side plate side is integrally provided with a protruding convex piece, and the convex piece is only on the heat seal region of the edge piece where the tongue piece is continuous. A flanged paper container characterized by being positioned .

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