JP4287112B2 - Paper tray - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper tray having a flange portion that is thermally bonded and sealed with a lid after filling with food or the like, and more specifically, a flange portion and a web that are automatically formed from a single blank plate by a molding machine. The present invention relates to a tapered paper tray having a corner portion.
[0002]
[Prior art]
Conventionally, this type of paper tray is folded on one edge of a blank plate made of paper container paper having a heat-adhesive resin layer on one side, for example, a rectangular bottom wall 20 as shown in FIG. Side walls 30, 40 are provided via the creases 23, 24, and the side edges of the adjacent side walls 30, 40 are connected to both side edges via the crease 34 and foldable adjacent via the crease 71. Folding joint walls 70 having folding plates 70a and 70b are provided, and flanges having projecting pieces α at both ends via the folds 35, the folds 46 and the creases 78 on the outer edges of the side walls 30 and 40 and the folds 70a. A blank plate 10 ′ made of paper container paper having a thermal adhesive resin layer on one surface provided with a flange plate 60 having flanges 60 and flange joint pieces 80 on both ends of the plate 50 and the flange joint piece 80 is placed on the upper side. Female mold to position (not shown) And a predetermined portion (the folding joint wall 70, the flange joint piece 80, and the protruding piece) of the blank plate 10 ′ by a heating device (not shown) mounted on the female mold (not shown). α, β) are heated, and a male mold (see FIG. 5) having a substantially I-shaped cross section is inserted into the female mold (not shown) from above the blank plate 10 ′ to thereby form the male mold (FIG. 5). And the female mold (not shown) cooperate to fold the creases 23 and 24 to the inner surface side so that the heat-adhesive resin layer of the blank plate 10 'is on the inner surface side. The side walls 30 and 40 are raised and the folding line 71 is valley-folded to the inner surface side to form the folding joint wall 70 in which the folding plates 70a and 70b are overlapped, and the end portion α of the flange plate 50 Is positioned below (external surface side) of the end portion β of the flange plate 60, and The folded joint wall 70 is bent to the side wall 40 side so that the flange joint piece 80 is positioned on the lower side (outer surface side) of the flange plate 60, and the overlapped portion is thermally bonded as shown in FIG. Such a paper tray 10 is obtained. In FIG. 4, the hatched portions are the above-described overlapping and heat-bonded portions. This type of paper tray is produced at a capacity of approximately 150 pieces / minute using a molding machine such as MP-HT type manufactured by Sprinter.
[0003]
However, the above-described molding machine manufactured by Sprinter is almost the final stage of the forming of the paper tray 10 shown in FIG. 4 (see FIG. 5A), and the paper as shown in FIG. 5B. In a state where the male mold 100 having a substantially I-shaped cross section is inserted into the tray 10, a mold side wall 200 having a convex cross section of a female mold (not shown) is engaged with the male mold 100, and The end portion α of the flange plate 50 (not shown) is positioned below (on the outer surface side) of the end portion β (not shown) of the flange plate 60, and the folding joint wall 70 is The side wall 40 includes the folding joint wall 70 which is folded to the side wall 40 side so that the flange joint piece 80 is positioned on the lower side (outer surface side) of the flange plate 60 and the overlapped portion is thermally bonded. It becomes a free state where the side is not supported by the female mold. In this final stage, the substantially central portion of the flange plate 50 is in a direction in which the female mold (not shown) comes into close contact with the male mold 100 by a mold side wall 200 having a convex cross section [on FIG. And both ends of the flange 50 are pressed downward (in the direction indicated by the arrow D in FIG. 5A) by the male mold 100, so that both ends of the flange plate 50 are In order to shift or peel off the heat-bonded part (the part shown by the diagonal lines in FIG. 5 (a)) that is in the temporary attachment state before being cooled and fixed due to the occurrence of stress (repulsive force due to the waist of the paper) There is a problem that a paper tray having a distorted shape cannot be formed without being formed into a predetermined shape or a paper tray having no container-shaped appearance (for example, see Patent Document 1). .
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-322676
[Problems to be solved by the invention]
Accordingly, the present invention has been made in view of the above problems, and is to provide a paper tray that does not become a distorted shape and does not impair the appearance of the container shape.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the inventor of the present invention has a paper tray 1 according to the first aspect in which side walls 30 and 40 are formed on four side edges of a rectangular bottom wall 20 via folding lines 23 and 24, respectively. Folding joint wall 70 having folding plates 70a and 70b that are provided and connected to both side edges via side folds 34 between side edges of adjacent side walls 30 and 40 and are foldable adjacent via folds 71. A flange plate 50 having projecting pieces α at both ends and a flange plate having projecting pieces β at both ends via the crease 35, the crease 46 and the crease 78 on the outer edges of the side walls 30, 40 and the folding plate 70a. 60 and the flange joining piece 80 are provided so that the projecting pieces α side located at both ends of the flange plate 50 of the paperboard paper having the heat-adhesive resin layer on at least one surface thereof are close to each other from the vicinity of the crease 35. The outer edge of the flange plate 50 The blank plate 1 ′ provided with a cutting line S extending in the vicinity thereof is folded up with the folds 23, 24 on the inner surface side with the thermoadhesive resin layer as an inner surface to raise the side walls 30, 40 and the crease 71. Are folded into the inner surface to form the folding joint wall 70 in which the folding plates 70 a and 70 b are overlapped, and the end α of the flange plate 50 is the outer surface side of the end β of the flange plate 60. In addition, the folded joint wall 70 is bent toward the side wall 40 so that the flange joint piece 80 is located on the outer surface side of the flange plate 60, and the overlapped portions are thermally bonded. And a paper tray 1 in which the creases 35, 46, 78 are folded in a mountain to form a flange portion F composed of the flange plates 50, 60 and the flange joint piece 80. The cut line S is formed on the side constituting the outer surface of the paper tray 1, and the cut line S is a half cut line .
[0007]
By adopting a configuration in which a cut line S is provided on the flange plate 50 on the protruding piece α side located at both ends of the flange plate 50 as described in the above-mentioned claim 1, for example, an MP-HT type manufactured by Sprinter Corporation Even if the paper tray is formed using a molding machine, in the final stage of the molding described in the section of the prior art, as shown in FIG. 5, the substantially central portion of the flange plate 50 is the female mold (not shown). The side wall 200 having a convex cross section is pressed in the direction in which it is in close contact with the male mold 100 (the direction indicated by the arrow M in FIG. 5A) and both end portions of the flange plate 50 are lowered by the male mold 100 (FIG. 5). (A) In the direction indicated by the arrow D], the stress applied to both ends of the flange plate 50 because the waist of the paper of the flange plate 50 is cut off at the cutting line S (paper (Repulsive force by the waist) The part of the heat-bonded part (the part indicated by the slanted line in FIG. 5A) in the temporary attachment state before cooling and fixing is not shifted or peeled off, and the appearance of the predetermined shape is good A paper tray can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention will be described in detail below with reference to the drawings.
1A and 1B show an embodiment of a paper tray according to the present invention. FIG. 1A is a perspective view seen from the storage unit side, FIG. 1B is a perspective view seen from the bottom side, and FIG. 1 is a paper tray, 1 'is a blank plate, 20 is a bottom wall, 30 and 40 are side walls, 70 is a folding joint wall, 70a and 70b are folding plates, and 50 and 60. Is a flange plate, 80 is a flange joint piece, 23, 24, 34, 35, 46 and 78 are creases, 100 is a male die of the molding machine, 200 is a female mold side wall of the molding machine, and α and β are flanges The edge part of a board, S shows a straight half cut line, F shows a flange part, respectively.
[0009]
1A and 1B show an embodiment of a paper tray according to the present invention. FIG. 1A is a perspective view seen from the storage portion side, FIG. 1B is a perspective view seen from the bottom side, and FIG. ) Is a developed view as viewed from the side, and the paper tray 1 has 20 on the entire surface of at least one surface (surface on which the contents are stored when used as a container) of about 240 to 400 g / m ^2. A base paper having a layer structure provided with a heat-adhesive resin layer made of an olefin resin such as polyethylene or polypropylene having a thickness of ˜60 μm is folded on the four edges of the rectangular bottom wall 20 as shown in FIG. Side walls 30, 40 are provided via 23, 24, and the side edges of adjacent side walls 30, 40 are connected to both side edges via folds 34 and are foldable adjacent via folds 71. A folding joint wall 70 having folding plates 70a, 70b is provided, and the side walls 30, 40 and In addition, a flange plate 50 having protruding pieces α at both ends, a flange plate 60 having protruding pieces β at both ends, and a flange joint piece 80 are provided on the outer edge of the folding plate 70a via a crease 35, a crease 46, and a crease 78. Further, the flange plate 50 on the other surface of the base paper (the outer surface side when a paper tray 1 described later) is approached from the vicinity of the crease 35 on the protruding piece α side located at both ends of the flange plate 50. The blank plate 1 ′ provided with the straight half-cut line S extending in the vicinity of the outer edge side of the flange plate 50 can be obtained by boxing.
[0010]
Box making of the blank plate 1 ′ configured as described above is actually automatically boxed using an MP-HT type molding machine manufactured by Sprinter, but specifically, the blank plate 1 ′. The folding lines 23, 24 are valley-folded to the inner surface side with the heat-adhesive resin layer as the inner surface, the side walls 30, 40 are raised, and the folding line 71 is valley-folded to the inner surface side, the folding plate 70a, The folding joint wall 70 is formed by superimposing the 70b, and the end part α of the flange plate 50 is positioned on the outer surface side of the end part β of the flange plate 60. Is folded to the side wall 40 side so that the flange joint piece 80 is positioned on the outer surface side of the flange plate 60, the overlapped portions are thermally bonded, and the creases 35, 46, 78 are folded in a mountain. The flange plate 0, 60 and the flange portion F formed of the flange joining pieces 80. it is possible to obtain a paper tray 1, as shown in FIG. 1, which is formed in the opening. The base paper for forming the paper tray 1 may have a layer structure in which the above-described thermoadhesive resin layers are provided on both sides of the paper container paper. In FIG. 1 (b), the hatched portions are the above-described overlapping and heat-bonded portions.
[0011]
By forming the straight half-cut line S at the above-described position on the outer surface side when the tray 1 of the flange plate 50 as described above is used, the blank is formed using an MP-HT type molding machine manufactured by Sprinter. Even if the plate 1 'is automatically boxed, as shown in the section of the prior art, the hatched portion in FIG. 1 (b) does not shift or peel off, and the appearance of the predetermined shape is good A paper tray 1 can be obtained.
[0012]
In the description so far, the cutting line S provided on the flange plate 50 has been described as a straight half-cut line. However, the cutting line S of the present invention is not limited to this, for example, a cutting line penetrating the flange plate 50. It may be a curved cut line, or may be an intermittent cut line such as a perforation.
[0013]
【The invention's effect】
As described above, the paper tray according to the present invention can form a straight half-cut line in the flange portion even if the paper tray is formed from a blank plate using a molding machine such as a male mold and a female mold as described above. By providing it, there is no distorted shape, and there is an excellent effect that the appearance of the container shape is not impaired.
[Brief description of the drawings]
FIG. 1A is a perspective view of an embodiment of a paper tray according to the present invention as viewed from the storage section side, and FIG. 1B is a perspective view as viewed from the bottom side.
FIG. 2 is a plan view of the blank plate of FIG. 1 viewed from the bottom side.
3 is a plan view of a conventional blank plate corresponding to FIG. 2. FIG. 4 is a perspective view showing an embodiment of a conventional paper tray corresponding to FIG.
FIGS. 5A and 5B are diagrams illustrating a final stage of molding by the paper tray molding machine, and FIG. 5B is a diagram showing a molding state of the paper tray, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper tray 1 'Blank board 20 Bottom wall 30,40 Side wall 70 Folding joining wall 70a, 70b Folding board 50,60 Flange board 80 Flange joining piece 23,24,34,35,46,78 Folding line 100 Male of a molding machine Mold 200 Female mold side walls α and β of molding machine End S of flange plate S Straight half cut line F Flange

Claims (1)

Side walls (30, 40) are provided on the four side edges of the rectangular bottom wall (20) via folding lines (23, 24), and both side edges are between the side edges of adjacent side walls (30, 40). Are connected via a crease (34) and foldable joining walls (70) having foldable plates (70a, 70b) adjacent to each other via a crease (71), and the side walls (30, 40). And a flange plate (50) having projecting pieces (α) at both ends via a crease (35), a crease (46) and a crease (78) on the outer edge of the folding plate (70a), and projecting pieces ( The protruding pieces (α) located at both ends of the flange plate (50) of the paper container paper having a thermal adhesive resin layer on at least one surface provided with the flange plate (60) having β) and the flange joint piece (80). ) Side of the flange plate so as to approach each other from the vicinity of the crease (35) 50) The blank plate (1 ′) provided with a cutting line (S) extending in the vicinity of the outer edge side is valley-folded on the inner surface side of the creases (23, 24) with the heat-adhesive resin layer as the inner surface, and the side wall (30, 40) is raised and the crease (71) is valley-folded to the inner surface to form the fold joint wall (70) on which the fold plates (70a, 70b) are overlapped, and further the flange plate The end portion (α) of (50) is positioned on the outer surface side of the end portion (β) of the flange plate (60), and the folding joint wall (70) is placed on the side wall (40) side. Fold and overlap so that the flange joint piece (80) is located on the outer surface side of the flange plate (60), heat-bond the overlapped portion, and fold the creases (35, 46, 78) The flange plate (50, 60) and the flange joint A paper tray (1) formed with a flange portion (F) composed of a piece (80) , wherein the flange line (50) is cut along the cut line (50) on the side constituting the outer surface of the paper tray (1). A paper tray (1) , wherein S) is formed, and the cut line (S) is a half cut line .

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