JP2004231301A - Folding packing carton - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with an adhesive at least on a bottom section in a folding packaging carton where the bottom section is formed in an automatic locking bottom form. <P>SOLUTION: A tongue piece section 16 is each formed at the corners of a pair of first bottom section pieces 9, 11 and the tongue piece section is provided so as to traverse the folding line 19 of the corner. In addition, an engagement hole 17 is each provided at the bottom section pieces 8, 10 adjacent to the bottom section pieces 9, 11 having the tongue piece sections 16 so as to fit the tongue piece section 16 into the engagement hole 17 to engage with each other. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a cardboard box, a paperboard box, a plastic box, for example, various packaging boxes made of a rigid PVC film, a rigid pet film, or a rigid PP film, which can be folded in a storage state and a transport state other than when used. The present invention relates to an auto-lock bottom capable of forming a bottom by a one-touch operation of expanding the box into a box shape.

  A conventional auto-lock bottom type packaging box has been formed as shown in FIGS. That is, it has side wall surfaces 1 to 4 formed in the shape of a rectangular tube and bottom pieces 8 to 11 projecting substantially trapezoidally from the lower ends thereof, and a margin 22 is provided on one side of the outermost side wall surface 4. Having. At the boundaries between the side walls, valley-folded vertical ruled lines 5 to 7 are formed. A valley-folded vertical ruled line 7a is also formed at the boundary between the side wall surface 4 and the bonding margin 22. In the unfolded state, the bottom pieces 9 and 11 each have a leading edge formed in a concave shape, and an L-shaped lock portion 18 is provided at the base of one side of the concave portion, and is provided on the other side of the concave portion. A mountain fold line 19 is provided from the base toward the intersection of the vertical ruled line 5 and the horizontal fold line 13. A triangular bent piece 20 is formed on the tip end side of the crease line 19.

  The sheet in such an unfolded state is formed by a cutting step and a ruled line step in an automatic box folding machine, and then conveyed downstream by a belt, and each bottom piece 8 to 11 is bounded by a horizontal folded line 12 to 15. At the same time as the valley-folding, the mountain-folded piece 20 is mountain-folded at the mountain-folding ruled line 19, and the glue 23 is attached to the surface of the mountain-folded piece 20. Then, the side wall surfaces 1, 2, 3, 4 are successively folded in valleys at vertical ruled lines 5 to 7, respectively, and a glue allowance 23 is attached to a glue allowance 22 protruding from the side wall surface 4, so that the bottom piece 8 and the mountain fold are formed. The bent piece 20 is adhered via the paste 23, and the paste margin 22 and the edge of the side wall surface 1 are adhered via the paste 23.

Then, at the end of the automatic box folding machine, it is folded and completed as shown in FIG. Many packaging boxes are stacked and stored or transported in the folded state of FIG. 14B. When a product or the like is stored inside, as shown in FIG. 14 (A), each of the side walls 1 to 4 is formed in a cylindrical shape, so that the box is formed including the bottom portion with one touch. At this time, the lock portions 18 of the bottom pieces are locked with each other. This state is maintained.
It should be noted that an automatic box folding machine for a foldable packaging box that performs the steps from the sheet material to the state shown in FIG. 14B is already known. That is, many machines and processes for automatically manufacturing a box in a folded state from a plate material through each process are known from the following patent documents and the like.

JP-A-11-048370 JP 10-077027 A JP 08-001836 A JP 07-256796 A JP 07-009590 A

The conventional auto-lock bottom type foldable packaging box requires a step of bonding adjacent bottom pieces with a glue 23. However, when the glue 23 is used on the bottom piece, the glue will protrude. In particular, if the size of the packaging box is relatively small, the glue 23 may protrude from the edge of the mountain-folded piece 20 as shown in FIG. 14 (A), and many defective products may be produced. Further, attaching the glue 23 to the mountain-folded piece 20 is cumbersome, complicates the manufacturing process of the automatic box folding machine, and has a limit in mass production. In addition, a gluing device for the bottom of the box is required, and the management of the coating device is troublesome. Furthermore, the use of an adhesive used as a glue has caused the working environment to deteriorate due to the solvent.
Therefore, an object of the present invention is to provide a packaging box that can be mass-produced by a conventional automatic box folding machine for a folding type folding box with an automatic lock bottom and that does not require gluing to the bottom.

According to the first aspect of the present invention, each of the first to fourth side wall surfaces formed in the shape of a rectangular tube is formed through a vertical fold line of a valley fold, and the first to fourth side wall surfaces are formed below the first to fourth side wall surfaces. In a foldable packaging box in which each bottom piece protruding from the edge is provided through a horizontal folding ruled line of a valley fold, and each bottom piece is combined, and the inner bottom is formed as an auto lock bottom,
When formed in the rectangular tube shape, a pair of first bottom pieces (9) and (11) projecting below a pair of side wall surfaces (2) and (4) opposed to each other are respectively provided with tongue pieces ( 16)
A second pair of bottom pieces (8) and (10) adjacent to the pair of bottom pieces (9) and (11) are provided with locking holes (17) into which the tongue pieces (16) are fitted and locked. Have
A pair of bottom pieces (9) and (11) each having the tongue piece (16) are, in the unfolded state, from the edge of the end of the leading edge, the horizontal folding lines (13) and (15) and the vertical folding. A crease line (19) is formed diagonally to the intersection with the crease lines (5) and (7) or in the vicinity thereof, except for an intermediate portion thereof. (20) is formed,
The tongue-shaped tongue piece (16) crosses the extension of the mountain-folded ruled line (19) at an intermediate portion of the mountain-folded piece (20) and at a position where the mountain-folded ruled line (19) does not exist. Protrudingly formed on
The crests (20) are bent at the crease lines (19), and the tongue pieces (16) protruding from the edges thereof are fitted and locked in the locking holes (17). It is a foldable packaging box.

The present invention described in claim 2 is based on claim 1,
A pair of bottom pieces (9) and (11) having the tongue piece (16) have a concave edge at the leading edge in the unfolded state, and have an L-shaped lock portion at the base of one side edge of the concave shape. 18) is formed, when the bottom of the box is formed, a pair of lock portions (18) are configured to be fitted and locked to each other, from the root of the other side edge of the concave shape, The mountain fold line (19) is provided except for the middle part thereof,
The root of the tongue piece (16) is located closer to the mountain-folded piece (20) than the mountain-folded ruled line (19),
A retaining means (21) is formed between a root of the tongue piece (16) and a corner of the locking hole (17),
The mountain fold line (19) is a foldable packaging box configured to have elasticity that returns to a planar direction after bending.

The present invention described in claim 3 is the invention according to claim 1 or claim 2,
A pair of bottom pieces (9) and (11) having the tongue pieces (16) become outer flaps located outside the bottom of the box, and a pair of bottom pieces (8) and (8) having the locking holes (17). 10) is a foldable packaging box serving as an inner flap located inside.
The present invention described in claim 4 is the invention according to any one of claims 1 to 3,
The crease line (19) is formed to be inclined at 45 ° with respect to the crease lines (13) and (15), and the tongue piece (16) projects so as to be orthogonal to the crease line (19). It is a foldable packaging box installed.

  The foldable packaging box according to the present invention, in which the box bottom is formed as an auto-lock bottom, has a tongue piece 16 on a pair of bottom pieces 9 and 11 facing each other, and is adjacent to the bottom pieces 9 and 11. The bottom pieces 8 and 10 have locking holes 17 into which the tongue pieces 16 are fitted and locked. Each of the tongue pieces 16 is provided so as to cross the extension of the crease line 19 at an intermediate portion of the crease piece 20 and bends the crease piece 20 to protrude from the edge thereof. Since the portion 16 is configured to be fitted and locked in the locking hole 17, it is possible to provide an auto-lock bottom type foldable packaging box which does not need to be attached to the bottom of the packaging box. That is, in the conventional foldable packaging box in which the bottom piece is formed on the auto-lock bottom, the adjacent bottom pieces are glued together, but in the present invention, the bottom piece is attached to the tongue piece 16 and the locking hole 17. Can be served.

  Moreover, the tongue piece 16 is configured to project from the conventional auto-lock bottom so as to cross the crease line 19 of the crease 20 and to be fitted and locked in the locking hole 17. In addition, a conventional automatic box folding machine for forming an automatic lock bottom can be used as it is, and a foldable packaging box with high mass productivity can be provided. Further, since at least the glue at the bottom of the box and the use of the adhesive are not used, a gluing device for the bottom of the box is not required, and deterioration of the working environment due to the solvent of the glue serving as the glue can be prevented.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 to 8 show the manufacturing process of the foldable packaging box of the present invention in order. FIG. 1 shows the expanded state. In FIG. 1, first to fourth side wall surfaces 1 to 4 formed in the shape of a rectangular tube, and a seam allowance 22 adjacent to the side wall surface 4 are formed via valley-folded vertical ruled lines 5 to 7 and 7a, respectively. On the lower side, bottom pieces 8 to 11 are formed to protrude through horizontal folding ruled lines 12 to 15 of valley folding.

  The bottom pieces 8 and 10 have a substantially trapezoidal shape, and in this example, the bottom pieces 9 and 11 have a substantially square shape. In the unfolded state, the leading edges of the bottom pieces 9 and 11 are recessed, and an L-shaped lock portion 18 is formed at the base of one side edge of the recess, and the side portion is folded laterally from the base of the other side edge. A mountain-folding ruled line 19 of a mountain-folding is formed excluding an intermediate portion toward or near the intersection of the ruled lines 13 and 15 and the vertical ruled lines 5 and 7. That is, the crease line 19 does not exist in the middle part.

  A mountain-folded piece 20 is formed on the tip side of the mountain-folded ruled line 19, and is formed in a substantially triangular shape. The tongue piece 16 is integrally formed at the center of the mountain-folded piece 20 and at a position where the mountain-fold ruled line 19 does not exist so as to cross the extension of the mountain-folded ruled line 19. The tongue piece 16 can be formed by cutting with a sharp cutting blade aligned with the outer periphery thereof, leaving its base. At the base of the tongue piece 16, a slight constriction retaining means 21 is formed. The retaining means 21 may have a shape as shown in FIGS. 12A and 12B which protrudes in the opposite direction. The mountain fold lines 19 are inclined at 45 degrees with respect to the horizontal fold lines 13 and 15.

  Next, square locking holes 17 are formed in the bottom pieces 8 and 10. That is, the locking hole 17 is opened at a position aligned with the tongue piece 16 when formed in the box. At the corner of the locking hole 17, a small recessed retaining means 21 is formed. The outer peripheral shape, the tongue piece 16, the locking hole 17 and each ruled line in such an expanded state are processed by a cutting process and a ruled line process of a known automatic box folding machine, and are conveyed to the next folding process in the expanded state. You. Then, in the next step, as shown in FIG. 2, the bottom pieces 8 to 11 are gradually folded into valley folds at the horizontal folding ruled lines 12 to 15, and the mountain folded pieces 20 are folded into mountain folds at the mountain folding ruled line 19.

  3, the side wall surface 1 and the side wall surface 4 are folded in a valley fold along the vertical ruled lines 5 and 7 as shown in FIG. The part 16 is fitted in the locking hole 17 of the bottom piece 8. FIGS. 5 and 6 show this state. At this time, the glue 23 is attached to the glue allowance 22, and further folded downstream as shown in FIG. 7, and the glue allowance 22 and the side wall surface 1 are bonded via the glue 23.

  In FIG. 6, after the tongue piece 16 is fitted into the locking hole 17, the mountain-folded piece 20 returns to the lock portion 18 due to its elasticity, and that state is maintained. Conversely, the mountain-folded ruled line 19 is once bent toward the mountain-folded side, and when returned, has a ruled line enough to hold the state. Then, it is folded as shown in FIG. 8 to complete a foldable packaging box.

  A large number of such folded packing boxes are stacked and stored or transported in the stacked state. In use, as shown in FIG. 9, the side wall surfaces 1 to 4 are formed in the shape of a rectangular tube, so that the lock portions 18 of the bottom pieces 9, 11 are locked together, so that the packaging as shown in FIG. The box is assembled with one touch. At this time, the tongue piece 16 does not fall out of the locking hole 17 due to the presence of the retaining means 21. In some cases, even if the retaining means 21 is not intentionally formed as an uneven portion, it can be covered by the fitting resistance between the two.

FIG. 11 is an explanatory view of a main part on the inner surface side when the box is formed in a rectangular cylindrical shape.
Next, FIG. 12A shows another example of the retaining means 21 provided at the base of the tongue piece 16 and the locking hole 17. In this example, only one side protrudes from the base of the tongue piece 16. The retaining means 21 is also recessed at the corner of the locking hole 17 at a position corresponding to it. Next, FIG. 12 (B) shows that the retaining means 21 is projected on both sides of the tongue piece 16, and the retaining means 21 is recessed at both corners of the locking hole 17 at a position matching the retaining means 21. I have.

Explanatory drawing which shows the unfolded state of the foldable packaging box of this invention, and shows the 1st process of the manufacturing process. Explanatory drawing which shows the 2nd process. Explanatory drawing which shows the 3rd process. Explanatory drawing which shows the same 4th process. FIG.

Explanatory drawing which shows the 5th process. Explanatory drawing which shows the same 6th process. Explanatory drawing which shows the same 7th process. Explanatory drawing which shows the middle of forming the bottom part of the packaging box. Explanatory drawing which shows the state which formed the same bottom part.

FIG. 4 is an explanatory view showing a state where the tongue piece 16 is viewed from the inner side of the packaging box. Explanatory drawing of the expanded state which shows the other Example of the packaging box of this invention. Explanatory drawing which shows the deployment state of the packaging box of the conventional type auto lock bottom. FIG. 14 is an explanatory view showing a folded state and a box formed state of the packaging box of FIG. 13;

Explanation of reference numerals

1-4 Side wall surface 5-7 Vertical ruled line 7a Vertical ruled line 8-11 Bottom piece
12 ~ 15 Horizontal folding line
16 Tongue piece
17 Lock hole

18 Lock section
19 Mountain fold ruled line
20 Mountain bent pieces
21 Means for retaining
22 Nori
23 Nori
24 packaging boxes

Claims (4)

Each of the first to fourth side wall surfaces formed in the shape of a rectangular tube is formed through a vertical fold line of a valley fold, and each bottom piece protruding from the lower edge of each of the first to fourth side wall surfaces is formed. In a foldable packaging box that is provided via a horizontal fold line of valley folds, and the bottom pieces are combined to form an inner bottom as an auto-lock bottom, when formed in the rectangular tube shape, a pair of opposed to each other A pair of first bottom pieces (9) and (11) projecting below the side wall surfaces (2) and (4) of the tongue pieces (16),
A second pair of bottom pieces (8) and (10) adjacent to the pair of bottom pieces (9) and (11) are provided with locking holes (17) into which the tongue pieces (16) are fitted and locked. Have
A pair of bottom pieces (9) and (11) each having the tongue piece (16) are, in the unfolded state, from the edge of the end of the leading edge, the horizontal folding lines (13) and (15) and the vertical folding. A fold line (19) is provided diagonally to the intersection with the rule lines (5) and (7) or in the vicinity thereof, except for the middle thereof, and the fold line (19) is used as a root and a fold piece ( 20) is formed,
The tongue-shaped tongue piece (16) crosses the extension of the mountain-folded ruled line (19) at an intermediate portion of the mountain-folded piece (20) and at a position where the mountain-folded ruled line (19) does not exist. Protrudingly formed on
The crests (20) are bent at the crease lines (19), and the tongue pieces (16) protruding from the edges thereof are fitted and locked in the locking holes (17). Foldable packaging box. In claim 1,
A pair of bottom pieces (9) and (11) having the tongue piece (16) have a concave edge at the leading edge in the unfolded state, and have an L-shaped lock portion at the base of one side edge of the concave shape. 18) is formed, when the bottom of the box is formed, a pair of lock portions (18) are configured to be fitted and locked to each other, from the root of the other side edge of the concave shape, The mountain fold line (19) is provided except for the middle thereof,
The root of the tongue piece (16) is located closer to the mountain-folded piece (20) than the mountain-folded ruled line (19),
A retaining means (21) is formed between a root of the tongue piece (16) and a corner of the locking hole (17),
The folding fold line (19) is a foldable packaging box configured to have elasticity to return to a planar direction after bending. In any of claim 1 or claim 2,
A pair of bottom pieces (9) and (11) having the tongue piece part (16) become outer flaps located outside at the bottom of the box, and a pair of bottom pieces (8) and (8) having the locking holes (17). Foldable packaging box with inner flap 10) located inside. In any one of claims 1 to 3,
The crease line (19) is formed to be inclined at 45 ° with respect to the crease lines (13) and (15), and the tongue piece (16) projects so as to be orthogonal to the crease line (19). Foldable packaging box installed.

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