JP5069055B2 - Cardboard box with tear strip - Google Patents

Description

  The present invention relates to a cardboard box having a tear strip for opening.

  In general, as a wrap-round cardboard box for packaging beverage cans, as shown in FIG. 24, a pair of standing plates 51 and a plane plate 52, which are continuously provided via ridge ruled lines 50, are folded and accumulated. A peripheral wall is formed by wrapping and joining at a passage piece 53, and end plates 54 and 55 extending from the upright plate 51 and the flat plate 52 are bonded and sealed.

  An opening tear strip 56 parallel to the ridge ruled line 50 is provided on the elevation plate 51 of the cardboard box, and a tear strip 56 is also provided on the end plate 54 in succession to this. Moreover, the center part of the upright board 51 is provided with the cut start part 57 which picks up the edge part of the tear strip 56 at the time of opening.

  Here, the tear band 56 is formed by two opposing straight cut lines 56a, and this cut line 56a is inserted by a liner cut that cuts the liner on the back side when the corrugator is used to manufacture the corrugated cardboard.

  In addition, when the blank 57 is manufactured by punching the corrugated cardboard with the die, the cut 57a forming the cut start portion 57 is inserted so as to penetrate the corrugated cardboard on the front and back sides by all cutting blades provided in the die.

  When opening the cardboard box, the cutting start portion 57 is pushed in and picked, the tear strip 56 is pulled to cut the cardboard of the elevation plate 51 and the end plate 54, the upper part of the cardboard box is removed, Can C is exposed from the bottom of the cardboard box.

  However, in the corrugated cardboard box as described above, the positional relationship between the cut line 56a of the tear band 56 and the cut 57a of the cut start portion 57 may be shifted at the time of manufacture, which may hinder the opening, and the cut is shallow. The cardboard may not be cut along the liner cut score line 56a.

  As a countermeasure, it is conceivable that the cut line 56a is put into a half-cut line by punching a blank with a half-cutting blade provided in the punching die. There is a possibility that the box will be bent at the line of sight 56a, resulting in poor box making.

  Further, when a plurality of sheets are stacked in a packaged state and the load of the upper cardboard box is applied to the lower cardboard box, the riser plate 51 may be swollen, and the aesthetics at the time of display sales may be impaired.

  Therefore, an object of the present invention is to provide 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 swell when stacked.

In order to solve the above-mentioned problems, the present invention comprises a rising plate and a flat plate connected via a ridge ruled line, a tear strip for opening parallel to the ridge ruled line, and a start portion thereof, In a corrugated cardboard box that is formed by bending a flat plate along a ridge ruled line, the tear band is formed by a wavy cut line, and the cut line penetrates the front and back of the cardboard and the cardboard is thick from the back side. shall the half cut portion cut halfway direction is to intermittently alternately in the top close to the edge portion borders wavy cut line and the top away from the ridge borders periodically curved, all switching unit It was to be located.

In the wavy cut line, the half cut portion is shifted from the line of the full cut portion .

  In such a corrugated cardboard box, the cut line of the tear band is wavy, and the half cut part between all cut parts of the cut line is inserted from the back side of the corrugated board. Therefore, the cut line does not act as a hinge when making the box. The cardboard is less likely to be bent inward along the tear line of the tear band, and is accurately bent along the ridge line of the elevation plate and the flat plate, thereby making it difficult to cause defective box making.

  In addition, since the cut line of the tear band and the cut of the start part are inserted with the same die during manufacture, the positional relationship between the tear line of the tear band and the cut part of the start part is not shifted, 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.

Furthermore, more the score line which takes into elevation plate and this was a corrugated, is prevented cylinder during stacking swelling, aesthetics during display is maintained.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  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, a pair of elevation plates 2 and plane plates 3 are alternately arranged via the ridge ruled lines 1, and a passage piece 4 is arranged continuously to one of the elevation plates 2 via the ridge ruled lines 1. Yes. 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 ruled line 1, and the tear strip 7 reaches the edge of the end plate 5. In the central portion of the upright plate 2, a cut start portion 8 is provided for picking an end portion of the tear strip 7 when opened.

  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 is a full cut portion 7b that penetrates the front and back of the cardboard. And a lead ruler in which a half-cut portion 7c in which the cardboard is cut from the back side to the middle in the thickness direction is alternately interrupted, and a connecting portion 7d having no cut is provided between the full-cut portion 7b and the half-cut portion 7c. Has been.

  Further, as shown in FIG. 14, the top portion where the tear band 7 is wide and the cut line 7 a is closest to the ridge ruled line 1, and the top portion where the tear band 7 is narrow and the cut line 7 a is farthest from the ridge ruled line 1. The full cut portion 7b is located at the end. Moreover, the full cut part 7b is longer than the half cut part 7c.

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

  Moreover, as shown in the blank of FIG. 1, the cut line of the tear band 7 at the ridges of the upright plate 2 and the end plate 5 is a full cut line, and the cut line of the tear band 7 in the end plate 5 is the back side of the cardboard It is assumed that a full cut line is appropriately combined with a half cut straight line from.

  The cut start portion 8 is formed by placing all cuts 8a penetrating the front and back of the cardboard into a deformed H-shape substantially corresponding to the waveform.

  In addition, a plurality of ribs 9 in the step direction perpendicular to the ridge ruled line 1 are put in parallel with a gap in the elevation plate 2 by being pressed from the front side of the cardboard and bulging to the back side. The rib 9 is disposed outside the tear band 7 so as to correspond to the apex where the cut line 7 a is closest to the ridge ruled line 1.

  As shown in FIG. 2, the die D for a die cutter for manufacturing the corrugated cardboard box is provided with a tear strip 7 in parallel with the straight strip-shaped pressing member 10 into which the ridge ruled line 1 of the upright plate 2 and the flat plate 3 is inserted. A wavy lead ruled blade 11 for entering the wavy cut line 7a is provided, followed by a whole cutting blade 12 for entering the cut 8a of the start portion 8.

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

  Here, as shown in FIG. 3, the lead ruler blade 11 is alternately formed with a high blade portion 11a and a low blade portion 11b at the blade edge portion, and between the high blade portion 11a and the low blade portion 11b. A recess 11c is provided.

  When punching a blank sheet S with such a die, as shown in FIGS. 3 and 4, in the lead ruler blade 11, the sheet S having the high blade portion 11 a supported by a support member 15 such as cork is viewed from the back side to the front side. The low blade portion 11b cuts the sheet S from the back side to the middle in the thickness direction, and the full cut portion 7b and the half cut portion 7c of the cut line 7a are inserted.

  Further, the concave portion 11c does not cut the sheet S, and a connecting portion 7d that is not cut is provided between the full cut portion 7b and the half cut portion 7c, thereby reducing the buckling strength of the sheet S at the cut line 7a. Is prevented.

  Further, at the time of punching, as shown in FIG. 5, the pressing member 13 is pressed from the front side to the sheet S in a state where the back side is supported by the receiving member 14, and the front side is recessed and bulges to the back side. Ribs 9 are formed.

  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. It becomes difficult to bend in the direction.

  Here, the die for inserting the wavy cut line 7a and the rib 9 as described above can be produced not only for a flat plate die cutter but also for a rotary die cutter.

  When assembling the blank punched out as described above and packaging a beverage can, a pair of elevation plates 2 and plane plates 3 are formed along the ridge line 1 as shown in FIG. Is wrapped, 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.

  At the time of making the box, in the above-mentioned corrugated cardboard box, as shown in FIG. 8, the cut line 7a of the tear strip 7 is corrugated, and the half cut part 7c extending between the full cut parts 7b is inserted from the back side of the corrugated cardboard. The line of sight 7a does not act as a hinge, and the corrugated cardboard is hard to bend inward at the cut line 7a of the tear strip 7, and is accurately bent along the ridge line 1 of the upright plate 2 and the flat plate 3. Can be prevented.

  Further, when the cardboard box is manufactured, the cut line 7a of the tear band 7 and the cut 8a of the cut start portion 8 are inserted in the same die, so that the positional relationship between them does not deviate, and a conventional corrugator liner is used. Compared to the manufacturing method in which the cut 8a is made by a die cutter after cutting, the defect rate can be greatly reduced.

  When the tear strip 7 is pulled from the cut start portion 8 at the time of opening, the full cut portion 7b is connected along the half cut portion 7c without being broken and unopenable like a line cut with a liner cut. Thus, the cardboard is cut and can be easily opened.

  In the opened state as described above, the elevation plate 2 is cut along the cut line 7a without being irregularly broken, and the wavy cut edge gives a visually elegant impression and is excellent in aesthetic appearance.

  On the other hand, when a plurality of cardboard boxes are stacked in the distribution process in the distribution process, the load of the upper cardboard box acts on the lower cardboard box, but the upright plate 2 has the front side of the cardboard. Since the rib 9 is inserted in a direction perpendicular to the ridge ruled line 1 by bulging from the back side to the back side, the upright plate 2 is less likely to bend to the bulging side and prevents the lower side cardboard box from being swollen can do.

  In addition, the fact that the tear band 7 is formed by two symmetrical wavy cut lines 7a also contributes to the prevention of body bulging since the bending of the elevation plate 2 is suppressed as in the case of the box making described above.

  By the way, in the said embodiment, in order to prevent effectively bending with the wavy cut line 7a at the time of box making, the rib 9 is put corresponding to the top part where the cut line 7a approaches the ridge part ruled line 1 most. However, as shown in FIG. 9, when the rib 9 is inserted corresponding to the apex where the cut line 7 a is farthest from the ridge ruled line 1, the rib 9 becomes longer, so that the effect of preventing body swelling is improved.

  Also, as shown in FIG. 10, the rib 9 is prevented from bending outward 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 ridge line 1. Since only inward bending is allowed, the effect of preventing trunk swelling is improved.

  In order to improve the effect of preventing the swelling of the body, the rib 9 may be provided inside the tear band 7 in addition to the outside, but in this case, the tear band 7 is bent by the rib 9 when opened and becomes difficult to pull. Therefore, it is better to omit it when emphasizing openability. Moreover, when using the thick cardboard excellent in intensity | strength, you may abbreviate | omit all the ribs 9. FIG.

  In addition, when the cut line 7a of the tear strip 7 is put into the corrugated cardboard box of each of the above-described embodiments, a die-cut lead ruled blade 11 as shown in FIG. 2 is formed on the cutting edge of the low blade portion 11b as shown in FIG. If the one having a slope is used, the low blade portion 11b is sequentially cut into the corrugated cardboard from the high blade edge portion, so that the corrugated cardboard is not strongly pressed and crushed, and it can be bent at a position other than the predetermined position at the time of box making. , The effect of preventing the swelling of the body during stacking is improved.

  Here, the blade edge of the low blade portion 11b may be a convex shape with a high central portion as shown in FIG. 11A or a concave shape with a low central portion as shown in FIG. 11B. Moreover, as shown in FIG.11 (c), it is good also as a shape inclined from one side to the other side, and having a some convex part and recessed part as shown in FIG.11 (d). Furthermore, you may make it curve in an arc shape or a wave shape, and when the connection part 7d is unnecessary, the recessed part 11c may be abbreviate | omitted.

  In addition, as shown in FIG. 12, in the lead ruled blade 11, the blade edge of the low blade portion 11b may be shifted in the blade thickness direction from the blade edge of the high blade portion 11a.

  When such a lead ruled blade 11 is used, as shown in FIG. 13, in the cut line 7 a, the half cut part 7 c is shifted from the line of the full cut part 7 b, so that the connecting part 7 d is ensured to be long and against bending. The strength can be improved, or the half cut portion 7c can be shifted in a direction in which the fissure is likely to deviate, so that the cut line 7a can be reliably cut without interruption.

  Further, as shown in FIG. 15, in order to improve the aesthetic appearance 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, and the lower cut line 7a. In this case, if the entire cut portion 7b is made longer than the other portions so that the portion toward the inside of the tear band 7 does not deviate to the outside at the time of tearing, the cutting edge of the lower portion remaining in the tray shape is beautiful. Become. Moreover, you may make it the full cut part 7b intermittently connect via a connection part not via the half cut part 7c in this part.

  In each of the above embodiments, the cut line 7a is illustrated as being sinusoidally curved. However, the cut line 7a may be a triangular wave having a slanted portion as shown in FIG. As shown in FIG. 17, it is good also as a trapezoidal thing which has a slightly flat part in the top part. In this case, in order to ensure the tearability of the tear strip 7, the full cut portion 7b is always located at the top of the corrugation, and the full cut portion 7b is curved so as to be smoothly connected to the half cut portions 7c on both sides. It is good to leave.

  In addition, although the upper and lower cut lines 7a are of the same type, they are not necessarily the same type, and the tear band 7 is formed by combining a sinusoidal shape, a triangular wave shape, or a trapezoidal shape. May be.

  Further, although the example in which the width of the tear band 7 fluctuates alternately in a wide and narrow manner is illustrated, 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 becomes constant. You may do it.

  Furthermore, although the upper and lower cut lines 7a of the tear band 7 are both undulated, as shown in FIG. 19, only the lower part remaining at the time of opening display is the wavy cut line 7a, and the upper part of the tear band 7 The cut line 7e may be inclined from the cut start portion 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 the saddle-shaped cut is intermittent.

  In addition, the ribs 9 with the vertical ruled lines are exemplified as the ribs 9 for preventing the swelling of the trunk. However, as shown in FIG. 20, the ribs 9 have inclined portions, for example, to give an image of the outline of the can. It may be.

  Further, instead of the ruled rib 9, as shown in FIGS. 21 and 22, a rib 9 having a certain area is provided by crushing the core of the corrugated cardboard in a planar shape, for example, storage of cans You may make it image a state.

  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, and a complete cutting line is made in a die D. A cutting blade 17 and a pressing member 18 for an auxiliary ruler 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 is provided inside the pressing member 18. When the sheet S is sandwiched between the pressing member 13 and the receiving member 14 and compressed, the rib 9 can be clearly formed.

  Further, not only the ribs 9 are formed by squeezing, but also a strong ruled line may be put in the squeezed part as shown in FIG.

  By the way, in each of the above embodiments, a rectangular parallelepiped corrugated cardboard box whose ridges are bent at right angles has been exemplified, but in the corrugated cardboard box having an octagonal cylindrical peripheral wall in which chamfered slopes are formed on these ridges. A similar configuration can be applied.

  Moreover, although the cardboard box having the tear strip 7 on the elevation plate 2 is illustrated, the same configuration can be applied to the cardboard box having the tear strip 7 on the flat plate 3.

  In addition, although a wrap round type cardboard box has been exemplified, a grooved type cardboard box in which flat plates extending from the upper and lower sides of adjacent elevation plates are overlapped and sealed is also provided with tear bands and ribs similar to the above. A similar 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.

The reverse view which shows the blank of the cardboard box which concerns on 1st Embodiment of this invention The perspective view which shows the principal part of a die cutting same as the above Enlarged perspective view showing correspondence between lead ruler blade and cutting Schematic cross-sectional view showing the cutting state with the lead ruler blade Schematic sectional view showing the pressing state by the pressing member and the receiving member The figure which shows the direction which can be bent with a rib same as the above The perspective view which shows the assembly sealing state of a cardboard box same as the above Partial perspective view showing the box making process The perspective view which shows the assembly sealing state of the cardboard box concerning 2nd Embodiment of this invention The perspective view which shows the assembly sealing state of the cardboard box concerning 3rd Embodiment of this invention Side view showing various forms of lead ruled blade Schematic cross-sectional view of a lead ruled blade with a shifted low blade Schematic of cut line with half cut off Detailed enlarged view showing the basic form of wavy cut lines Enlarged detail view of the elevation plate showing other forms of wavy cut lines Enlarged detail drawing showing other forms of wavy cut lines Enlarged detail drawing showing other forms of wavy cut lines Partial back view of blank showing other forms of wavy cut lines Partial back view of blank showing other forms of tear strip Blank partial back view showing other forms of ruled ribs Partial back view of blank showing one form of crushing rib Blank partial back view showing other forms of crushing ribs Schematic cross-sectional view showing a die-cutting die The perspective view which shows the assembly sealing state of the conventional cardboard box

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Edge part ruled line 2 Elevation board 3 Plane board 4 Passage piece 5,6 End plate 7 Tear strip 7a Cut line 7b Full cut part 7c Half cut part 7d Link part 8 Cut start part 8a Cut 9 Rib 10 Pressing member 11 Lead ruled blade 11a High blade portion 11b Low blade portion 11c Concave portion 12 Full cutting blade 13 Pressing member 14 Receiving member 15 Supporting member 16 Cutting plate 17 Cutting blade 18 Pressing member D Cutting die U Face plate S Sheet

Claims (2)

The elevation plate (2) and the plane plate (3) are connected through the ridge ruled line (1), and the tearing strip (7) for opening parallel to the ridge ruled line (1) and its start part (8 In a cardboard box for making a box by bending the elevation plate (2) and the plane plate (3) along the ridge line (1),
The tear band (7) is formed by a wavy cut line (7a), and the cut line (7a) is cut from the back side to the middle of the thickness direction from the back side to the entire cut part (7b) passing through the front and back of the cardboard. and filled-in half cut portion and (7c) is intended to intermittently alternately a top away from the corrugated score line which periodically curved apex close to the ridge border (1) of (7a) and the edge portion borders (1) Further, a cardboard box characterized in that the whole cut portion (7b) is positioned . The elevation plate (2) and the plane plate (3) are connected through the ridge ruled line (1), and the tearing strip (7) for opening parallel to the ridge ruled line (1) and its start part (8 In a cardboard box for making a box by bending the elevation plate (2) and the plane plate (3) along the ridge line (1),
The tear band (7) is formed by a wavy cut line (7a), and the cut line (7a) is cut from the back side to the middle of the thickness direction from the back side to the entire cut part (7b) passing through the front and back of the cardboard. cardboard boxes filled-in half cut portion and (7c) is assumed to be intermittently alternately, characterized in that shifting the half cut portion from the line of the total Setsubu (7b) (7c).

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