JPH09123309A - Forming method for folding line for trough line of packaging case and forming press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately bend the folding line of a trough line for connecting the laminating part of a foldable packaging case. SOLUTION: The connecting piece to be combined by interlocking to the other adjacent peripheral wall constituting part at the time of assembling is connected to the peripheral wall or end wall via the folding line 15 of a trough line, which is press formed on the flat surface by a thin plate-like marking blade 31. As the blade 31, the blade 31 having two protruding edges 31b so formed as to be parallel with the longitudinal direction along the thin plate at the sectional end is used. The line 15 is formed as two parallel press grooves 15c approached by the edges 31. The blade 31 has a groove 31a formed at the center of the end section of the thin plate and protruding edges 31b formed at both sides of the groove 31a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for forming a valley line fold in a packaging paper box and a forming die.

[0002]

2. Description of the Related Art A conventional box manufacturing method, for example, a case where a paper box as shown in FIG. 1 is made from a plate material 1 shaped as shown in the development view of FIG. , The plate member 1 includes two pairs of peripheral walls 2 forming a tubular portion.
The seam allowance 6 is connected to the joint end of 5, and the folds 7 and 8 of the mountain line are 9
The tubular portion is formed by bending it at 0 ° and joining the peripheral wall 2 at the opposite end and the margin 6 to each other.

A lid 11 and an auxiliary lid 12 are foldably connected to the opening end side of the peripheral wall of the tubular portion, and a pair of bottom plates (end walls) 13 and 14 are provided at the bottom side peripheral wall end. Each bottom plate 1
Bending pieces 16 and 17 for connecting and fixing 3 and 14 to the adjacent peripheral walls 2 and 4 via connecting pieces 13b and 14b described below are connected to each other via fold lines 9 and 10 of the mountain line.

As shown in FIGS. 1 to 3, the bottom plates 13 and 14 intersect with each other in the left-right and up-down directions in a rotationally symmetrical shape and overlap each other to form a rectangular bottom portion. , 14a, and connecting pieces 13b, 14b that are adhesively fixed and connected to the back surface (inner side of the box) of the above-mentioned bending pieces 16, 17 have fold line folds 15 at the end portions on the cutout side. Is formed through.

Bending pieces 16 of the connecting pieces 13b, 14b,
The adhesion to 17 and the adhesion of the seam allowance 6 on the cylindrical portion side and the end of the peripheral wall 2 are sequentially folded along the folds 7 to 10 and 15 in the assembly process on the box assembly line, It is automatically assembled, and after the assembly is completed, the box is flatly folded as shown in FIG. 2 for distribution or storage. In other words, this structure allows for a small space during handling of the box and easy reassembly during use.

As shown in FIG. 4, the valley line fold 15 is formed with a cutout line 15a at its central portion and at both ends thereof with a pressing groove 15b consisting of a concave groove having an arcuate cross section. The cut line 15a is
As shown in FIG. 5 (B), the base end side is embedded and fixed in a substrate 21 made of plywood having a size of about 18 mm, and a sponge or the like for the cutting blade is provided on both sides of the cutting blade 22 protruding from the tip side which is a cutting blade tip. It is formed by pressing and cutting out the plate material 1 on the pressing table 24 using a well-known one provided with a cushion 23 made of.

On the other hand, in the pressing groove 15b, as shown in FIG. 5 (A), two pressing ruled blades 26, 26 projecting in parallel with each other on the substrate 21 at a constant interval are provided on the pressing table 24. It is formed by pressing against the upper plate material 1, but a jig 27 made of a hard resin having a convex cross section is attached and arranged at a position between the ruled blades 26, 26 on which the pressing groove 15b is to be formed on the pressing base 24. doing. The cross-sections of the fold lines 7 to 10 of the illustrated mountain line are concave groove folds formed by ruled blades (not shown) having a round or square cross section.

The valley line fold 15 formed in this way
Is bent in a valley shape, the connecting pieces 13b, 1 are connected to the front side of the bending pieces 16, 17 on the box assembly line as described above.
When attempting to bond while bending the inner surface side of 4b, the connecting pieces 13b and 14b are not bent according to the formed folds 15 and are bonded in a state shifted from the planned bonding positions 16a and 17a. Since it was impossible to automatically assemble the equipment at the same time, it was often necessary to stop the line to remove defective products.

The present invention provides a method for forming valley folds and a die for avoiding the occurrence of defective products and troubles on an assembly line while avoiding the use of the above-mentioned complicated molds. To do.

[0010]

The forming method and forming die of the present invention for solving the above-mentioned problems are, firstly, a connecting piece 13b which is combined with another adjacent peripheral wall constituent portion in an assembled manner during assembly. In a method in which the ridge line fold 15 is continuously formed on the peripheral wall or the end wall portion through the valley line fold 15 and the valley line fold 15 is press-formed on a plane by a thin plate-shaped ruled blade 31. Two protruding blades 31b are formed so that their cross-section tips are parallel to the longitudinal direction along the thin plate, and the fold line folds 15 are two parallel pressing grooves 15c closer to the protruding blades 31b. It is characterized by being formed as.

Secondly, the ruled blade 31 is formed with a concave groove 31a at the center of the cross section of the tip of the thin plate, and the protruding blades 3 are provided on both sides of the concave groove 31a.
It is characterized by being 1b.

Thirdly, in the case where the punching blade 36 for cutting the material and the crease forming ruled blades 31 and 37 are linearly arranged and embedded on the front surface side of the substrate 21, the valley line is folded when the box is assembled. The ruled blade 31 forming the fold line fold 15 of the connecting piece 13b that is bent through the eyelet 15 and is superposed so as to be connected to the other peripheral wall forming portion is provided with two protrusions parallel to the tip of the cross section. Blade 31
The feature is that b is formed.

Fourthly, the ruled blade 31 is formed with a concave groove 31a at the center of the cross section of the tip portion, and the protruding blades 31b are formed on both sides of the concave groove 31a.
It is characterized by having.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.
Since it has the same structure as that of FIG. 3 and also has a common part such as a stamping die, the description of these common parts will be omitted and common corresponding parts will be denoted by the same reference numerals.

In this embodiment, a ruled blade 31 made of a single thin steel plate is used, and the tip cross section of the ruled blade 31 has a U-shaped concave groove 31a formed at the center as shown in FIG. Projecting blades 31b, 3 projecting downward and parallel to both sides thereof
1b. When the ruled blade 31 is pressed against the surface side of the plate material 1 on the pressing table 24, two pressing grooves 15c, 15c as shown in FIGS. Is attached.

As shown in the figure, the pressing grooves 15c, 15c have a V-shaped valley-shaped cross section with an acute angle, and are adjacent to each other.
Since it is attached in parallel, the fold line 15
When an external force is applied to bend the connecting pieces 14a and 14b in a valley line shape along the line, the two pieces are smoothly and surely bent at two places along the pressing grooves 15c and 15c, and the bending position is exactly the crease 15. Matches

As a result, even on the box assembly line, the connecting pieces 13b and 14b are bent into the bending pieces 16 and
It is accurately bonded to the bonding positions 16a, 17a on the 17 side.
The ruled blade 31 may have a V-shaped concave groove 31a at the tip as shown in FIG. 7B, or a spacer plate between two grooved steel plates forming two protruding blades 31b. The groove 31a may be formed so as to project at both ends of the cross section (not shown).

FIG. 9 is an overall perspective view of the die according to the present invention. On the front surface side of the substrate 21, a punching blade (cutting blade ... represented by a solid line) 36 along the contour of the plate material 1 and a fold of a mountain line. The mountain line ruled blades 37 corresponding to the stitches 7 to 10 and the valley line ruled blades 31 corresponding to the above-mentioned valley line folds 15 are embedded and fixed to protrude.

[0019]

According to the present invention configured as described above, it is possible to use a plurality of ruled blades and punching blades unlike the conventional case.
By embedding and fixing a single blade, it is possible to form a fold line for the entire valley line, and there is no need for a gauge on the pressure table side as in the past, so the overall cost of the device and its preparation can be reduced. There is.

Further, since the folds of the valley line are formed as valley-shaped grooves having two sharp V-shaped cross sections, the valley line can be bent accurately and smoothly, and the other peripheral wall due to the incorrect bending of the connecting piece. There is an advantage that problems such as a malfunction of the interconnection with the parts and a stop of the box assembly line due to the malfunction of the interconnection are solved.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view of a paper box.

FIG. 2 is a bottom view of the paper box in the assembled and folded state.

FIG. 3 is a developed surface view of a board material for a paper box.

4A and 4B are a partially enlarged developed surface view of a conventional connecting portion and a BB cross-sectional view in FIG.

5A and 5B are cross-sectional views showing a conventional method for forming a valley line and a die.

FIG. 6 is a perspective view showing a work state of folding and bonding the connecting piece to the peripheral wall portion.

7A and 7B are cross-sectional views showing a valley line fold forming operation state or a cross section of a ruled blade thereof, and FIG. 7C is a cross-sectional view showing a shape of the valley line fold and a state at the time of bending.

FIG. 8 is a partial plan view of a valley line fold according to the present invention.

FIG. 9 is an overall perspective view of a pressing die according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paperboard material 2-5 Peripheral wall 13,14 Bottom plate 13b, 14b Connecting piece 15 Valley line folds 15c, 15c Push groove 31 Ruled line blade for valley line fold formation 31a Recessed groove 31b Projecting blade

Claims (4)

[Claims] 1. A connecting piece (13b), which is linked to another peripheral wall constituent portion adjacent to the assembly wall at the time of assembling, is continuously connected to the peripheral wall or the end wall portion through a fold line (15) of the valley line. In the method of pressing and forming the fold line (15) of the valley line on the plane by the thin plate-shaped ruled blade (31), the cross-section tip of the ruled blade (31) should be parallel to the longitudinal direction along the thin plate. A valley line in a packaging box in which a fold line (15) of a valley line is formed as two parallel pushing grooves (15c) which are closer to the above-mentioned protrusion blade (31b) by using one formed with two protrusion blades (31b) Method for forming folding folds. 2. The packaging box according to claim 1, wherein the ruled blade (31) is formed with a concave groove (31a) at the center of the cross section of the leading end of the thin plate, and both sides of the concave groove (31a) are protruding blades (31b). Method for forming folds for valley lines in. 3. A box in which a blanking blade (36) for cutting a material and crease forming ruled blades (31), (37) are linearly arranged and embedded on the front surface side of a substrate (21). Ruled blades that form the valley line folds (15) of the connecting piece (13b) that are folded through the valley line folds (15) at the time of assembly and are overlapped so as to be connected to other peripheral wall constituent parts. (31) A die for forming a fold line for a valley line in a packaging box in which two projecting blades (31b) parallel to the tip of the cross section are formed. 4. A trough in a packaging box according to claim 3, wherein the ruled blade (31) is formed with a groove (31a) at the center of the cross section of the tip portion thereof, and both sides of the groove (31a) are projecting blades (31b). Stamping die for forming line folds.