JP2002347139A - Method for forming blank connecting part of corrugated cardboard package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a blank connecting part of a corrugated cardboard package, which enables a reduction in production cost by rationally enhancing workability. SOLUTION: When a blank 2 for a required product is stamped out from a corrugated cardboard sheet 1, a tie part 3 between a part of the blank 2, and a stamping scrap part 5 and/or the part of the blank 2 is formed as a weakening structure which can maintain a tractional force during conveyance and can be separated in a final process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a process of punching and forming a blank of a packaging box from a cardboard sheet. The present invention relates to a method for forming a blank connection portion of a cardboard package, which can be separated into a plurality of cutouts and a cutout of which is provided with a safe and beautiful appearance.

[0002]

2. Description of the Related Art Conventionally, a packaging box made of cardboard has been manufactured by punching into a required size and shape using a punching die.
The mainstream of the cutting blade used in this punching die is a straight blade generally called a straight blade, which can be bent according to the shape. The blank of the packaging box punched using this straight blade has a problem that a cut portion parallel to the step of the corrugated cardboard sheet becomes a razor-like cut, and consumers are hurt by this sharp cut. .

[0003] For these reasons, in recent years, a punching die using a wave-shaped blade, which is a wave blade having a fine edge, which is safe and has an aesthetic appearance in view of the PL method (product liability law), has been adopted. Blanks punched with such a knife,
The outer cut has a fine waveform, and the problem of consumers cutting their hands when opening and closing the box is eliminated, and the small waveform that looks and looks beautiful is also excellent in appearance.

On the other hand, when performing punching work from a cardboard sheet using a flat plate die cutter, the sheet is fed from a paper feeding section through a press section (punching section), and is separated from a sheet (removal section of punched debris, hereinafter referred to as a dropping section), a hammer section ( As shown in FIG. 6A, the product portion 100 (blank) and the scrap portion 101 are separated from each other to separate the grip portion for movement) and to convey the sheet to the paper discharge portion.
So that the product part 100 and the waste part 10 are not cut at the punched portion so that
It is necessary to form a nick 102 (generally, a nick formed by crushing the cutting edge to form an uncut portion). In such a work process, the nick 102 connecting the product part 100 and the waste part 101 punched in the press part is separated from the waste part 101 mainly generated around the product part 100 at the dropping part and transported by the hammer part. The nick with the part that was being held for is separated. After that, the connecting portion of the blank (nick 10)
2) is the packaging box blank 1 which is manually separated
00.

The nicks 102 formed in the punching process play an important role in the process of manufacturing the packaging box blank 100. The nicks 102 are formed by the intermittent motion due to the high speed operation of the flat die cutter. Is higher,
In particular, a strong nick is required as a pull nick in order to further stabilize the conveyance, as a nick for connecting both the grip side at the time of conveyance and when two blanks are taken before and after. In order to strengthen the nick, there are a method of increasing the nick and a method of providing many small nicks.

[0006]

However, in order to form a normal nick, a cutting edge of a punching die is formed by manually cutting a part of the blade using a grinder or a punch. It is difficult to form at a proper pitch. Therefore, generally 1cm
A method of forming at intervals of a degree is employed. as a result,
As shown in FIG. 6 (b) which shows a nick mark generated at a cut in a conventional packaging box, a clean waveform formed on a cut 105 having a blank outer shape using a wave blade is crushed, and the blank is cut. There is a problem in that an ugly protrusion 106 remains on the outer shape, resulting in a case (box) that is not preferable in appearance.

Further, when performing a punching operation with a flat die cutter, a pulling nick is not provided under a fixed condition, but rather a shape of a blank to be punched and a material strength and material of a corrugated cardboard sheet to be processed. In such a case, a temporary setting is made before the work, a test is performed, and the cutting blade is processed each time to form a nick until an optimum state is found, and then the best state is found, and then the normal operation is started. Adjustments are required. for that reason,
Performing a normal punching operation requires a lot of labor and time. For this reason, the fact that a large amount of preparation time is required for the punching operation is a serious problem in streamlining production remarkably in the present situation where various kinds of small-quantity production are required.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to obtain a beautiful finish, and at the same time, rationally improve the workability and reduce the production cost. It is an object of the present invention to provide a method for forming a blank connection portion of a package made of a metal.

[0009]

In order to achieve the above-mentioned object, a method of forming a blank connecting portion of a cardboard package according to the present invention is used for punching a blank of a required product from a cardboard sheet. The connecting portion between the blank portion and the scrap portion and / or the blank portion of the product is formed in a weakened structure which can maintain the traction force during transportation and can be separated in the final process.

According to the present invention, in performing a punching operation by a punching die, a portion serving as a joining portion between a blank portion and a scrap portion and / or a blank portion of a product is provided.
When a so-called nick is provided, when moving from a punching process to a paper discharge section on a cut line, a product is connected to a clamp part for conveyance and a product part (blank), or when two or more product parts are taken out. In the process of moving to the final paper discharge part (the discharge part of the product part) such as the product part and the clamp part, the product part has enough strength that it does not separate at the joint (nick), and the product part during the work process Thus, it is possible to obtain a connection portion that can prevent a failure due to the division. Then, after the sheet is sent to the sheet discharging section and discharged, for example, when an external force is applied to the connecting portion with the product portion by hand, the sheet can be easily separated without damaging the sheet surface or the cut at the portion formed in the weak structure. It is. In other words, in the entire process of the punching work, it functions to maintain the traction force of the work, and in the final process, when an external force is applied to the blank, the connecting portion can be separated, and the cut edge of the separated connecting portion is cut by the cutting blade. It is in a state close to the part, and it is assembled as a package and beautifully finished without deteriorating the appearance.

In the present invention, it is preferable that the separable weakening structure formed in the connecting portion is formed by a cutting blade having a blade for cutting at a minute pitch. In this way, the connecting portion can form a large number of minute portions connected back and forth at extremely narrow intervals in the width direction. This has the effect of satisfying the conflicting condition of separation.

It is preferable that the separable weakening structure formed at the connecting portion is formed by a sewing blade. According to this sewing machine blade, the length of the cutting blade and the pitch of the blade can be made very small and used, and the fiber of the work sheet is partially cut at a fine pitch during processing to achieve the purpose. Can be. In addition, the traces of the separation of the blank will result in the thinning of the sheet-forming fibers at the fine joints. It has a fine waveform similar to the blank outer part cut and formed by the wave blade, and it is finished in a series of small waveforms with a beautiful appearance, eliminating the problem that it is beautiful and consumers cut their hands. There are advantages.

[0013] The separable weakening structure formed in the connecting portion is formed in parallel with the step of the cardboard sheet.
It is preferable that cuts are formed at a plurality of pitches between the peaks of the step. In this case, the separation is easy when separating, and the separation mark (nick mark) is inconspicuous,
The effect of beautiful finish can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a method for forming a blank connecting portion of a cardboard package according to the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a main part of an embodiment of a blank connecting portion of a cardboard package according to the present invention. FIG. 2 is a diagram showing a punching embodiment of a package according to the present invention, FIG. 3 is an enlarged perspective view showing a part of a blank connecting portion in a punching die, and FIG. Are shown, respectively.

In this embodiment, FIG. 2 shows a case where two package blanks are taken from one cardboard sheet, and the package blanks 2 and 2 are connected from a cardboard sheet 1 of a required size. The sheet is then punched out and can be separated into two pieces at a sheet discharge section. In the case of such a two-piece cutting, in a blank punching die, when a conventionally well-known cutting edge is implanted and arranged on the substrate 12 in a required shape, one of the flap portions 2a to which the blanks 2 and 2 are connected is formed. A sewing machine blade 11 having a blade portion formed so as to be intermittently provided at an extremely short pitch is connected to the connecting portion 3 to the other flap portion 2b (see FIG. 3). Similarly, the blade 3 is connected to the blank flaps 2c and 2d connected to the sheet grip 4 for transporting the blank punched from the sheet drop section to the sheet discharge section so that the blank is intermittently formed at an extremely short pitch. The blanks 2 and 2 can be moved without being separated at the time of conveyance by implanting a sewing machine blade 11 having a portion formed. Reference numeral 14 in the figure is a cutting blade.

The blanks 2 and 2 punched out of the work sheet (cardboard sheet 1) by the punching die as described above are used to remove the surrounding chip portion 5 and the internal chip portion from the work sheet at the page dropping portion. When 6 is removed,
The sheet holding portion 4 and the blanks 2 and 2 are left, and the sheet holding portion 4 is held by the clamper as it is and is conveyed to the hammer portion. During this conveyance, the blanks 2 and 2 and the connecting portion 3 (nick) between the blank 2 and the sheet holding portion 4 are pulled together without being separated while maintaining the connected state. Then, in the hammer portion, the sheet is cut off at the connecting portion 3 between the sheet holding portion 4 and the blank 2 and dropped to the sheet discharging portion.

In the blanks 2 and 2 punched in the punching section, a connecting portion 3 is formed to have a required length and a weakened structure at the time of punching by the sewing machine blade 11 described above. As shown in FIG. 1, the connecting portion 3 is provided with a notch for intermittently cutting a section having a predetermined length L at an extremely short pitch. By doing so, the connecting portion 3 forms the blank 2 punched by the remaining portion, in which the fibers of the liner portion and the core (corrugate) portion constituting the corrugated cardboard sheet 1 to be processed are left partially uncut. , 2 maintain a state in which they are not separated in a section where they are conveyed from the punching section to the hammer section through the drop section, in other words, the tractive force is maintained. Therefore, the length dimension L of the connecting portion 3 is determined by a dimension capable of securing a traction force in the horizontal direction at the time of transportation by the flat die cutter, and the arrangement condition is set according to the shape and dimensions of the blank to be punched. You. The setting of the connecting portions 3 depends on the shape of the blank 2, but it is preferable to disperse the connecting portions 3 without providing them at a specific location.

The connecting portions 3 of the blanks 2 and 2 thus provided are in a connected state in a state where the connecting portions 3 are separated from the sheet holding portion 4 by the hammer portion and sent to the sheet discharging portion. Therefore, when the worker holds the connecting blanks 2 and 2 by hand and applies an external force in a direction in which the connecting portion 3 is divided (for example, by bending along the connecting portion), the connecting portions 3 As described above, since the cut is made intermittently at an extremely short pitch, even if a small external force is applied, the blank is easily divided into two blanks 2.

The blank 2 of the package thus obtained
As shown in FIG. 4, the flap portions 2a, 2a
In the end face b, the traces of the connecting portions 3 are alternately formed with the cut portions 3a cut at an extremely short pitch and the cut portions 3b of the connecting portions, and the cut portions 3b are cut by the cutting of the fibers. It becomes a state that is more prominent than 3a, and presents small irregularities in appearance. As a result, the division mark of the connecting portion 3 appears in a similar state to the cut 8 of the flap formation by the wave blade, and the appearance is beautifully finished. Therefore, unlike the related art, there is no possibility that the trace of the connecting portion appears in any of the irregularities and becomes ugly.

Further, as described above, in the connecting portion 3 according to the present embodiment, the cut 8 after the separation has a fine uneven shape and the divided portion (divided mark 3b) remains in a state where the fibers are loosened. When handling the package formed by assembling the blank, the effect is obtained that the cut 8 is safe without damaging the hand. Further, by doing so, during the operation in the punching process, there is no possibility that the blank is detached at the joint portion 3 and the blank comes off, so that a trouble such as interruption of the operation does not occur. In addition, especially in the preparation process to enter the work, it is not necessary to set conditions such as the arrangement of nicks for checking the traction force of the connecting portion as in the conventional case,
The labor can be saved, workability can be further improved, productivity can be increased, and cost reduction can be achieved.

The sewing machine blade 11 that forms the connecting portion 3 includes:
The pitch of the intermittent blades 11a depends on the type of the corrugated cardboard sheet 1 to be handled, but is preferably formed at two to three pitches for one of the core corrugated peaks 1a. Also,
Regarding the formation of the connecting portion 3 using such a sewing machine blade 11, when the thickness of a corrugated cardboard as a work sheet is increased, it is not shown in a punching die, but it is not shown in the place where the sewing machine blade is planted. The object can be achieved by arranging the holding pieces on both sides of the blade so that the core of the cardboard is held down during punching.

In the above description, a case has been described in which the connecting portion 3 is provided for the blank 2 to be punched in a direction in which the corrugated mountain 1a of the cardboard sheet 1 is parallel to the pulling direction (moving direction) of the sheet. When the sheet is towed and conveyed in a direction different from that described above due to the shape of the blank and other factors, as shown in FIG. The connecting portion 3A between the sheet holding portion 2 and the sheet holding portion 4 (blanks) is provided at a plurality of portions with a dimension L 'shorter than that of the above embodiment. Note that the connecting portion 3A is formed with a sewing blade with a cut that is interrupted at an extremely short pitch, as in the above-described embodiment.

In this way, the blank 2 can be transported without being separated while the sheet gripper 4 is gripped and moved by the clamper of the transport means in the section from the punching section to the hammer section. In the state sent to
Even when a plurality of blanks are connected, the same effect as in the above embodiment can be obtained. Further, when the connecting portion 3A is separated, unlike the case where the connecting portion is formed so as to intersect with the stepped portion 1a of the cardboard sheet 1 as in the above-described embodiment, the connecting portion 3A is provided in parallel with the stepped portion 1a. Therefore, if the connecting portion 3A is simply bent, it may be difficult to cut it. Therefore, if the connecting portion 3A is slightly pulled and bent, it can be easily separated.

Since the cut marks of the connecting portion 3A thus cut are cut into the sheet at an extremely short pitch, the cut portions and the cut marks are alternately shown, and the appearance of extremely small irregularities continues. Presents a state and appears with a clean cut.
Of course, as described above, the cut has very small irregularities, so that the cut does not damage the fingers during handling after being assembled as a package.

In the above description, the use of a sewing machine blade having the same cutting edge and intermittent cutting blades has been described for forming a separable weakening structure to form a connecting portion. It is also possible to use a blade having a saw-tooth shape or a blade having a wavy shape.

In the above description, an example in which a wave blade is used as a cutting blade in a punching die has been described. However, the sewing machine blade having the connecting portion is formed in a punching die using a general straight blade as a cutting tool for forming an outer shape. It can be optional.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part showing an embodiment of a blank connecting portion of a cardboard package according to the present invention.

FIG. 2 is a diagram illustrating a punching embodiment of a package according to the present invention.

FIG. 3 is an enlarged perspective view showing a part of a connection portion of a blank in a punching die.

FIG. 4 is a perspective view showing a partially enlarged connecting portion after division.

FIG. 5 is a diagram showing a part of another embodiment.

FIGS. 6A and 6B are a diagram showing an example of a nick forming portion at the time of manufacturing a blank of a conventionally adopted packaging box and a diagram showing a cut mark in a commercialized packaging box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated cardboard sheet 1a Corrugated mountain 2 Package blank 3, 3A Connecting part 3a Cut part 3b Cutting mark 4 Sheet grip part 5, 6 Dust part 11 Sewing machine blade 11a Intermittent blade

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kunio Kimura 2-10-12 Komagaki, Kawanishi-shi, Hyogo F-term (reference) 3E075 AA05 AA12 CA01 DB12 DB17 DB19 DB32 GA02

Claims (4)

[Claims] When a blank of a required product is punched from a corrugated cardboard sheet, a connecting portion between the blank portion and a scrap portion and / or a blank portion of the product can be separated in a final process by maintaining a traction force during transportation. A method for forming a blank connecting portion of a cardboard package, wherein the blank connecting portion is formed in a weakened structure as possible. 2. The method according to claim 1, wherein the separable weakening structure formed in the connecting portion is formed by a cutting blade having a blade for cutting at a fine pitch. 3. The method for forming a blank connecting portion of a cardboard package according to claim 1, wherein the separable weakening structure formed at the connecting portion is formed by a sewing machine blade. 4. The detachable weakening structure formed in the connecting portion is formed such that cuts are formed at a plurality of pitches between the ridges of the corrugated cardboard when formed in parallel with the corrugated corrugated cardboard sheet. The method for forming a blank connection part of a cardboard package according to any one of claims 1 to 3.