WO2008018533A1

WO2008018533A1 - Punch die for cardboard box with tear strip

Info

Publication number: WO2008018533A1
Application number: PCT/JP2007/065592
Authority: WO
Inventors: Katsuji Hashimoto; Takayuki Takeuchi
Original assignee: Nippon Die Steel Co., Ltd.
Priority date: 2006-08-09
Filing date: 2007-08-09
Publication date: 2008-02-14
Also published as: EP2050681A1; JP4758958B2; JP2008280088A; EP2050681A4

Abstract

Punch die for making a cardboard box easy to unseal by a tear strip without causing inferior box-making. A die cutter-use punch die for making a cardboard box in such ways that a vertical surface plate (2) and a horizontal surface plate (3) are provided continuously via a ridge rule (1), an unsealing tear strip (7) and its starting part (8) parallel to the ridge rule (1) are provided, the tear strip (7) is formed of a wave-form cut line (7a), this cut line (7a) is used as a lead rule where full cut portions penetrating through the front and rear surfaces of the cardboard and a half cut portions cutting the cardboard from the rear surface side to the middle in its thickness direction are alternately formed intermittently, and the vertical surface plate (2) and the horizontal surface plate (3) are folded along the ridge rule (1) to make a box, wherein in order to form the wave-form cut line (7a) of the tear strip (7) along with a pressing member (10) in which a ridge rule (1) is scored, a wave-form lead rule blade (11) in which high blade portions and low blade portions are formed alternately is provided, and subsequently a full cutting blade (12) for forming the cut line (8a) of the staring part (8) is provided.

Description

Specification

Cutting of cardboard box with bow I fissure

Technical field

[0001] The present invention relates to a die cutter for producing a cardboard box having a tear strip for opening.

Background art

[0002] In general, as a wrap-round cardboard box for packaging beverage cans, as shown in FIG. 24, a pair of elevation plates 51 and flat plates 52 connected in series via ridges 50 are folded and integrated. Wrapped can C is used, a peripheral wall is formed by joining at passage piece 53, and end plates 54 and 55 extending respectively from standing plate 51 and flat plate 52 are bonded and sealed.

[0003] An opening tear strip 56 parallel to the ridge line 50 is provided on the elevation plate 51 of the cardboard box, and the tear strip 56 is also provided on the end plate 54 continuously. . Further, in the center of the upright plate 51, there is provided a cut start portion 57 that picks up an end portion of the tear strip 56 when opened.

[0004] Here, the tear strip 56 is formed by two opposing straight cut lines 56a, and this cut line 56a is formed by a liner cut that cuts the liner on the back side when the corrugated cardboard is made of material. Can be put.

[0005] In addition, the cut 57a that forms the cut-off portion 57 is formed by punching the cardboard with a die! / When manufacturing a blank, the cutting board provided in the die is inserted so that the cardboard penetrates the front and back. Is

[0006] When opening the cardboard box, the cut-out portion 57 is pushed in and picked, the tear strip 56 is pulled, the cardboard of the elevation plate 51 and the end plate 54 is cut, and the upper part of the cardboard box is removed. Then, can C is exposed from the bottom of the corrugated cardboard box.

Disclosure of the invention

Problems to be solved by the invention

[0007] However, in the corrugated cardboard box as described above, the positional relationship between the cut line 56a of the tear strip 56 and the cut 57a of the start portion 57 may be shifted during manufacture, which may hinder opening. Cannot cut corrugated cardboard along the liner cut line 56a!

[0008] As a countermeasure, a force that can be considered to make the cut line 56a into a half-cut line by punching the blank with a half-cutting blade provided in the punching die. Then, it will bend at the piercing line 56a, and there is a possibility that a box making defect will occur.

[0009] In addition, when a plurality of packages are stacked in a packaged state and the load of the upper cardboard box acts on the lower cardboard box, the riser plate 51 is swollen, and the aesthetics at the time of display sales are impaired. ^{There are s} .

[0010] Therefore, the present invention is to provide a die-cutting for manufacturing a corrugated cardboard box that can prevent the phenomenon of bending at the tear line of the tear band during box making, can be easily opened by the tear band, and does not easily bulge when stacked. And

Means for solving the problem

[0011] In order to solve the above-described problem, the present invention provides an elongate tear plate and a flat plate parallel to each other via a ridge line, and an opening tear strip parallel to the ridge line and a start portion thereof. The tear band is formed by a wavy cut line, and the cut line includes a full cut part penetrating the front and back of the cardboard and a half cut part in which the corrugated ball is cut from the back side to the middle in the thickness direction. Pressing member that inserts the ridge line in the die-cutting die for die cutting to produce a corrugated box that is made by alternately bending the lead up and down and bending the elevation plate and the flat plate along the ridge line. At the same time, in order to enter the wavy cut line of the tear band, a corrugated lead blade with alternating high and low blades is provided, followed by a cut at the start. All the cutting edges are provided

[0012] In the lead ascending blade, a gradient is provided at the edge of the low blade portion, and the blade edge of the low blade portion is shifted from the blade edge of the high blade portion in the blade thickness direction.

The invention's effect

[0013] In the corrugated cardboard box manufactured by such a die cutting, the tear line cut line is wavy, and the half-cut part between all cut parts of the cut line is inserted from the back side of the cardboard. The line of sight does not act as a hinge, and the corrugated cardboard is difficult to bend inwardly at the tear line of the tear strip, bends accurately along the ridge line of the elevation plate and the flat plate, and causes the occurrence of defective boxes. Become. [0014] In addition, at the time of opening, since the cut line of the tear band and the cut of the start part are put in the same die during manufacture, the positional relationship between the tear line of the tear band and the cut part of the cut part is not shifted. When the tear strip is pulled from the cut start portion, the cardboard is cut so that the entire cut portion is connected along the half cut portion, and can be easily opened.

[0015] Further, by making the cut line in the elevation plate corrugated and providing ribs by pressing from the front side of the corrugated cardboard, swelling of the body at the time of stacking is prevented, and the appearance at the time of display is maintained. Brief description of

FIG. 1 is a back view showing a blank of a cardboard box according to the first embodiment of the present invention.

FIG. 2 is a perspective view showing the main part of the same die

[Fig. 3] Enlarged perspective view showing the correspondence between the lead lift blade and the notch

[Fig. 4] Schematic cross-sectional view showing the cutting state with the lead lift blade

FIG. 5 is a schematic sectional view showing a pressing state by the pressing member and the receiving member.

[Fig.6] Diagram showing the direction in which the rib can be bent

FIG. 7 is a perspective view showing the assembled and sealed state of the cardboard box same as above.

[Figure 8] Partial perspective view showing the box making process

FIG. 9 is a perspective view showing an assembled sealed state of the cardboard box according to the second embodiment of the present invention.

FIG. 10 is a perspective view showing an assembled sealed state of a cardboard box according to a third embodiment of the present invention.

[Fig.11] Side view showing various forms of lead raising blade

[Fig. 12] Schematic cross-sectional view of the lead raising blade with the low blade part displaced

[Fig. 13] Schematic of cut line with half cut

[Fig.14] Enlarged detail drawing showing the basic form of wavy cut lines

[Fig.15] Enlarged detail of the elevation plate showing other forms of wavy cut lines

[Fig.16] Enlarged detail drawing showing other forms of wavy cut lines

[Fig. 17] Enlarged detail drawing showing other forms of wavy cut lines

[FIG. 18] Partial back view of blank showing another form of wavy cut line

[Fig. 19] Partial back view of blank showing another form of tear strip

[FIG. 20] Partial back view of blank showing another form of the rising rib [FIG. 21] Partial back view of blank showing one form of crushing ribs [FIG. 22] Partial back view of blank showing other forms of crushing ribs [FIG. 23] Schematic cross-sectional view showing a die for crushing

FIG. 24 is a perspective view showing an assembled and sealed state of a conventional cardboard box.

1 Ridge shoreline

2 Elevation plate

3 Flat plate

4 passage pieces

5, 6 End plate

7 Tear zone

7a score line

7b Full cut

7c Half cut

7d connection

8 Cutting section

8a cut

9 ribs

10 Press member

11 Lead raising blade

11 a High blade

l ib Low blade

11c recess

12 Full cutting edge

13 Press member

14 Receiving member

15 Support material

16 Cutting plate 18 Pressing member

D die cutting

U face plate

S sheet

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] This cardboard box is of a wrap round type in which 24 beverage cans are arranged in four rows of 6 in a row, and is formed from the blank shown in FIG. In this blank, each pair of elevation plates 2 and plane plates 3 are alternately connected via the ridge line 1, and the passage piece 4 is connected to one of the elevation plates 2 via the ridge line 1. Has been. End plates 5 and 6 are connected to both ends of the upright plate 2 and the flat plate 3, respectively.

The elevating plate 2 is provided with a tear strip 7 for opening parallel to the ridge line 1, and the tear strip 7 reaches the edge of the end plate 5. At the center of the upright plate 2, there is a cut start 8 that picks up the end of the tear strip 7 when opened!

[0021] Here, the tear band 7 in the elevation plate 2 is formed by two wavy cut lines 7a that are periodically curved and symmetrical, and each cut line 7a penetrates the front and back of the cardboard. The full cut portion 7b and the half cut portion 7c in which the cardboard is cut from the back side to the middle in the thickness direction are alternately interrupted, and a connecting portion 7d without cut is provided between the full cut portion 7b and the half cut portion 7c. The lead has been increased.

Further, as shown in FIG. 14, the width of the tear band 7 is wide and the cut line 7a is closest to the ridge line 1 and the width of the tear band 7 is narrow and the cut line 7a is the ridge line On the farthest part from line 1 is the full cut 7b. The full cut portion 7b is longer than the half cut portion 7c.

[0023] Depending on the size and material of the box, it is desirable that the wavelength A of the score line 7a be 40 mm to 80 mm, and match the diameter of the can. The wave height B should be 5 mm to 15 mm, and the width C of the narrowest part of the tear band 7 should be 10 mm to 20 mm. Further, the wavelength A, the wave height B, and the width C may be changed every cycle.

[0024] In addition, as shown in the blank of FIG. 1, the tear strip 7 is cut at the ridges of the elevation plate 2 and the end plate 5. The line of sight is a full cut line, and the cut line of the tear strip 7 in the end plate 5 is a combination of a full cut line and a half cut straight line from the back side of the cardboard.

[0025] The cut start portion 8 is formed by placing a full cut notch 8a penetrating the front and back of the cardboard into a deformed H shape substantially corresponding to the waveform.

[0026] In addition, a plurality of ribs 9 in the step direction perpendicular to the ridge line 1 are placed in parallel on the elevation plate 2 by pressing from the front side of the corrugated cardboard and bulging to the back side. It is. The rib 9 is arranged on the outer side of the tear zone 7 corresponding to the apex where the cut line 7a is closest to the ridge line 1.

[0027] As shown in FIG. 2, the die cutting die D for manufacturing this corrugated cardboard box is parallel to the straight belt-shaped pressing member 10 for inserting the ridge portion 1 of the upright plate 2 and the flat plate 3, A corrugated lead scissor blade 11 is provided for placing the corrugated cut line 7a of the tear zone 7, followed by a full cutting blade 12 for accepting the cut 8a of the starting portion 8.

Further, as shown in FIGS. 2 and 5, the face plate U that receives the blank sheet S from the front side at the time of punching is provided with a straight belt-like pressing member 13 for inserting the rib 9 on the pressing member 10 of the die D. Receiving member 14 provided in a direction orthogonal to the lead raising blade 11 corresponding to the top portion closest to the pressing member 10, and the die D having a groove in which the tip end of the pressing member 13 is loosely fitted. Provided

Here, as shown in FIG. 3, in the lead raising blade 11, the high blade portion 11a and the low blade portion l ib are alternately formed in the blade tip portion, and the high blade portion 11a and the low blade portion are formed. A recess 11c is provided between the parts l ib.

[0030] When the blank sheet S is punched by such a die, as shown in Figs. 3 and 4, in the lead ascending blade 11, the high blade portion 11a has a sheet S supported by a support material 15 such as cork. The low blade part l ib cuts the sheet S from the back side to the middle in the thickness direction from the back side to the front side, and the full cut part 7b and the half cut part 7c of the cut line 7a are made.

[0031] Further, the recess 11c is provided with an uncut connecting portion 7d between the full cut portion 7b and the half cut portion 7c where the sheet S cannot be cut, and thereby the buckling of the sheet S along the cut line 7a. A decrease in strength is prevented.

[0032] Further, at the time of this punching, as shown in FIG. In a state where the side is supported, the pressing member 13 is pressed from the front side, and the rib 9 bulging to the back side is formed.

[0033] As shown in Fig. 6, the sheet S with the ribs 9 is easily bent in the direction in which the ribs 9 are valleys on the front side, as shown in Fig. 6, but in the opposite direction, that is, the ribs on the front side. It will be difficult to bend in the direction where 9 becomes a mountain.

[0034] Here, the die for inserting the wavy cut line 7a and the rib 9 as described above can be manufactured for a rotary die cutter as well as for a flat plate die cutter.

When assembling the blanks punched out as described above and packaging the beverage can, a pair of elevation plates are used along the ridge line 1 as shown in FIG. 2 and the flat plate 3 are bent, the accumulated can C is wrapped, a peripheral wall is formed by joining at the passage piece 4, and the end plates 5 and 6 are bonded and sealed.

[0036] At the time of making the box, as shown in Fig. 8, in the corrugated cardboard box, the cut line 7a of the tear strip 7 is corrugated, and a half cut part 7c extending between all cut parts 7b is inserted from the back side of the cardboard. From

The cut line 7a does not act as a hinge, and the corrugated cardboard is not easily bent inward along the cut line 7a of the tear strip 7, and is accurately bent along the ridge line 1 of the elevation plate 2 and the flat plate 3. Occurrence of box defects can be prevented.

[0037] In addition, when manufacturing the above corrugated cardboard box, the cut line 7a of the tear strip 7 and the cut 8a of the cut start portion 8 are put in the same die, so that the conventional corrugated structure in which the positional relationship does not deviate. Compared with the manufacturing method in which the cut 8a is made with a die cutter after the liner is cut with a die, the defect rate can be greatly reduced.

[0038] Upon opening, when the tear strip 7 is pulled from the cut start portion 8, the full cut portion along the half cut portion 7c that does not become unopenable as if it was cut with a liner cut. The cardboard is cut so that 7b is connected and can be easily opened.

[0039] In the opened state as described above, the upright plate 2 is cut along the cut line 7a without being irregularly broken, and the wavy cut edge gives a visually graceful impression and is excellent in aesthetics. Stuff

[0040] On the other hand, when a plurality of cardboard boxes are stacked in a distribution process in a state where products are packaged, the load of the upper cardboard box is applied to the lower cardboard box. surface By bulging the cardboard 2 from the front side to the back side of the cardboard, the ribs 9 are put in a direction perpendicular to the ridge line 1 so that the elevation board 2 is less likely to bend to the bulge side. The lower side cardboard box can be prevented from swelling.

[0041] In addition, the fact that the tear band 7 is formed by two symmetrical wavy cut lines 7a also suppresses the bending of the elevation plate 2 as in the case of the box making described above, and thus contributes to the prevention of body swelling. To do.

[0042] By the way, in the above embodiment, the rib 9 corresponds to the apex where the cut line 7a is closest to the ridge line 1 in order to effectively prevent bending at the wavy cut line 7a during box making. However, as shown in FIG. 9, when the rib 9 is inserted corresponding to the apex where the cut line 7a is farthest from the ridge line 1, the rib 9 becomes longer. improves.

[0043] As shown in FIG. 10, the rib 9 faces the outside along the horizontal line of the elevation plate 2 even if it is placed outside the tear strip 7 in a direction parallel to the ridgeline 1 Since the bending is prevented and only the inward bending is allowed, the effect of preventing the body swelling is improved.

[0044] In order to improve the effect of preventing the swelling of the trunk, the rib 9 may be provided in addition to the outside of the tear band 7. However, in this case, the tear band 7 is bent by the rib 9 when opened and pulled. This may be difficult, so it is better to omit it if you want to emphasize openability. Also, when using thick cardboard with excellent strength, all ribs 9 may be omitted.

[0045] In addition, when the cut line 7a of the tear strip 7 is put in the corrugated cardboard box of each of the above-described embodiments, as the punched lead raising blade 11 as shown in FIG. 2, as shown in FIG. If the blade edge is provided with a slope, the low blade part l ib is sequentially cut into the corrugated board from the high part of the cutting edge. The effect of preventing bending at other than the above and swelling of the body when stacked is improved.

Here, the cutting edge of the low blade portion l ib has a convex shape with a high central portion as shown in FIG. 11 (a), and a concave shape with a low central portion as shown in FIG. 11 (b). do it. Further, as shown in FIG. 11 (c), the shape may be inclined from one side to the other side, or may have a plurality of convex portions or concave portions as shown in FIG. 11 (d). Further, when the connecting portion 7d that can be curved in an arc shape or a wave shape is not necessary, the concave portion 11c may be omitted.

Further, as shown in FIG. 12, in the lead raising blade 11, the blade edge of the low blade portion 1 lb may be shifted in the blade thickness direction from the blade edge of the high blade portion 11a. [0048] When such a lead ascending blade 11 is used, as shown in FIG. 13, the half cut portion 7c is shifted from the line of the full cut portion 7b in the cut line 7a, so that the connecting portion 7d is secured long, The strength against bending can be improved, or the half-cut portion 7c can be shifted in the direction in which the fissure is likely to deviate so that the cut line 7a can be cut without interruption.

[0049] Also, as shown in FIG. 15, in order to improve the aesthetics at the time of opening and displaying, the upper and lower cut lines 7a and the start portion 8 are formed in a continuous sine wave shape corresponding to the cans to be stored, In the cut line 7a, if the entire cut 7b is made longer than the other parts so as to prevent the rupture part from escaping to the outside during tearing and breaking, the lower part remaining in the tray shape The cut edge of the part becomes beautiful. Also, in this part, the full cut portion 7b is intermittently connected through the connecting portion without going through the half cut portion 7c.

[0050] In each of the above embodiments, the cut line 7a is illustrated as being sinusoidally curved. However, the cut line 7a is formed as a triangular wave having a straight slope portion as shown in FIG. Moreover, as shown in FIG. 17, a trapezoidal shape having a slightly flat portion at the top may be used. In this case, in order to ensure the tearability of the tear strip 7, a full cut portion 7b is always positioned at the top of the corrugation, and the full cut portion 7b is bent so as to be smoothly connected to the half cut portions 7c on both sides. It is good to keep it.

[0051] In addition, although the upper and lower cut lines 7a are of the same type, they are not necessarily the same type, and it is not always necessary to combine the sine wave shape, the triangular wave shape, and the trapezoidal shape. May be formed.

[0052] Further, a force exemplifying that the width of the tear band 7 varies alternately between wide and narrow, as shown in Fig. 18, the upper and lower cut lines 7a have parallel waveforms with the same phase, and the width of the tear band 7 is constant. You may make it become.

[0053] Furthermore, as shown in Fig. 19, force S is an example in which the upper and lower cut lines 7a of the tear band 7 are both wavy, as shown in Fig. 19, only the lower part remaining at the time of opening display is the wavy cut line 7a, The upper cut line 7e of the band 7 may be inclined from the start part 8 and extend along the upper ridge line 1. In this case, the cut line 7e may be a zipper or a half cut line in which saddle-shaped cuts are intermittent.

[0054] In addition, the rib 9 that prevents the swollen body is illustrated with a vertical ascending line. However, as shown in FIG. 20, the rib 9 has an inclined portion, for example, a contour of a can. Ime It's okay to let them go.

[0055] Further, instead of the rib 9 of the shoreline, as shown in FIG. 21 and FIG. 22, a rib 9 having an area of a certain range is provided by crushing the core of the cardboard in a planar shape, for example, You can make it look like the storage state of the can!

When manufacturing this blank, as shown in FIG. 23, a flat plate-like pressing member 13 made of hard plastic, metal, or the like is attached to a cutting plate 16 fixed to a face plate U. A cutting blade 17 for inserting all cutting lines and a pressing member 18 for auxiliary promotion are attached, and a receiving member 14 having a slight elasticity such as a cork having a pressure receiving surface corresponding to the pressing member 13 inside the pressing member 18. When the cardboard sheet S is sandwiched between the pressing member 13 and the receiving member 14 and compressed, the rib 9 can be clearly formed.

[0057] Further, as shown in FIG. 22 in which the rib 9 is simply formed by squashing, it is also possible to make a strong line in the squashed portion! / ,.

[0058] By the way, in each of the above embodiments, a force exemplifying a rectangular parallelepiped corrugated cardboard box whose ridges are bent at right angles, respectively, has an octagonal cylindrical peripheral wall in which chamfered slopes are formed on these ridges. A similar configuration can be applied to a cardboard box.

Further, the same configuration can be applied to a cardboard box having the tear plane 7 on the plane plate 3 exemplified for the cardboard box having the tear band 7 on the elevation plate 2.

[0060] Further, in a grooving type corrugated cardboard box in which a flat plate extending from the upper and lower sides of an adjacent vertical plate is overlapped and sealed, a tear band similar to the above is used on the vertical plate. When ribs are inserted, the same effect can be obtained. In this case, a plurality of tear bands may be provided in parallel in the height direction of the elevation plate so that they can be opened in multiple stages.

Claims

The scope of the claims

[1] A tear strip (7) and its opening parallel to the ridgeline (1) by connecting the elevation plate (2) and the flat plate (3) through the ridgeline (1). A notch (8) is provided, and the tear strip (7) is formed by a wavy score line (7a), and the notch line (7a) is passed through the front and back of the corrugated cardboard (7b) and the corrugated cardboard. Is the reverse side force, and the half-cut part (7c) cut halfway in the thickness direction is the lead ascending intermittently, and the vertical plate (2) and the flat plate (3) are ridged (1) In die cutting for die cutters that produce cardboard boxes that are folded along

Along with the pressing member (10) for inserting the ridge line (1) and the wavy score line (7a) of the tear strip (7), the high blade part (11a) and the low blade part (l ib) Corrugated cardboard box characterized by the provision of alternating wavy lead raising blades (11), followed by all cutting blades (12) into which the cuts (8a) of the starting portion (8) are provided Die cutting.

[2] The corrugated cardboard box punching die according to claim 1, wherein the lead ascending blade (11) is provided with a gradient at a cutting edge of the low blade portion (l ib).

[3] The lead raising blade (11) according to claim 1 or 2, wherein the blade edge of the low blade portion (lib) is shifted in the blade thickness direction from the blade edge of the high blade portion (11a). Corrugated cardboard box.