JP2012126444A - Cardboard box, and its punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cardboard box that secures its strength in a tray state and enhances suppression effect against its body swelling in a packing state.SOLUTION: A blank for this cardboard box provided with an unsealing tear strip 7 to be torn to turn the cardboard box into the tray state has a shape as follows. A vertical surface plate 2 and a horizontal surface plate 3 are connected via a ridge crease line 1, the unsealing tear strip 7 is formed on the vertical surface plate 2 over both ends thereof, the tear strip 7 is formed by periodically curving two wave-form cut lines 7a, and each of the cut lines 7a is used as a lead line where full cut portions 7b penetrating through both sides of the cardboard and a half cut portions 7c cutting the cardboard from the backside to the middle in its thickness direction are alternately formed intermittently. The vertical surface plate 2 and the horizontal surface plate 3 are mutually bent along the ridge crease line 1 to form the cardboard box. At least a lower side cut line 7a out of the two wave-form cut lines 7a forming the tear strip 7 is formed with swelling sections 7e such that they get away from parts opposing valley sections of a fundamental wave, of the ridge crease line 1. This enhances a countervailing power against a moment caused by a load.

Description

  The present invention relates to a corrugated cardboard box having a tear-off band for opening, and a mold for the same.

  Conventionally, in Patent Document 1 below, as shown in FIG. 9, each of a pair of opposed elevation plates 52 and a respective planar plate 53 opposed to each other via two pairs of upper and lower paired ridge ruled lines 51, respectively. Is folded at the ridge line 51, wrapped around the accumulated beverage can C, and a peripheral wall is formed by joining at the passage piece 54, and end plates 55 and 56 extending from the upright plate 52 and the flat plate 53 are bonded together and sealed. A wrap-round cardboard box is described.

  Each elevation plate 52 is provided with an opening tear strip 57 extending in the transverse direction, and a cut-out portion 58 positioned at the center for pulling when the opening plate is pulled. The tear band 57 is formed by two wavy cut lines 57a that are periodically curved, and the start portion 58 is formed by a deformed H-shaped full cut line 58a.

  Each cut line 57a is a lead in which all cut portions 57b penetrating the front and back of the cardboard and half cut portions 57c in which the cardboard is cut from the back side to the middle in the thickness direction are alternately interrupted, and the connecting portions 57d are dotted. The amplitude center line is parallel to the ridge ruled line 51.

  The tear band 57 is configured in this manner to prevent the phenomenon that the corrugated cardboard is bent inwardly at the cut line 57a of the tear band 57 instead of the ridge ruled line 51 where the corrugated cardboard becomes a predetermined bent part. This is to suppress the occurrence of defective box making. Another reason for this is to prevent a phenomenon in which the riser plate 52 is swollen when a plurality of cardboard boxes are stacked in a packaged state.

  The elevation plate 52 is pressed from the front side of the corrugated cardboard and bulges to the back side, so that a plurality of ribs 59 in the step direction perpendicular to the ridge part ruled line 51 are put in parallel at intervals, thereby , Improve the effect of preventing torso.

  When opening the cardboard box at the time of display at a store, for example, the cut-out portion 58 is pushed in and pulled, and the tear strip 57 is pulled to connect the upright plate 52 and the end plate 55 connected thereto to the cut line 57a. As shown in FIG. 10, the upper portion of the cardboard box is removed and the can C is exposed from the corrugated cardboard box as a tray, so that the display effect is enhanced and the can C can be easily taken out. .

JP 2008-280088 A

  However, in the corrugated cardboard box as described above, when a relatively weak material is used, as shown in FIG. 10, both end portions in the longitudinal direction are subjected to the load of a large number of cans C as trays. When the hand is lifted by placing the hand on the bottom surface of the board, the bent line Y starts from the valley portion of the cut line 57a that becomes the upper edge of the upright plate 52, that is, from the portion where the remaining height of the corrugated cardboard from the ridge ruled line 51 facing the lower side is small. Entered, the strength of the tray could be impaired.

  Further, when the cardboard boxes are stacked and transported / stored, the effect of preventing the swelling of the trunk cannot be obtained sufficiently, and the aesthetics at the time of display may be impaired.

  Accordingly, an object of the present invention is to secure the strength in the state of the tray and to improve the effect of preventing the swelling in the packaged state.

  In order to solve the above-mentioned problem, the present invention is a continuous arrangement of an elevation plate and a plane plate via a ridge ruled line, and the elevation plate is provided with a tear strip for opening across both ends thereof. Are formed by two wavy cut lines that are curved in a curved line, and each cut line is intermittently formed by a full cut portion penetrating the front and back of the cardboard and a half cut portion in which the cardboard is cut from the back side to the middle in the thickness direction. In a corrugated cardboard box with a tear strip that is made into a box by bending an elevation plate and a flat plate along a ridge ruled line as a lead wire, and in a tray state in accordance with tearing by the tear strip, two corrugated cuts forming the tear strip Among the lines of sight, at least the lower cut line is provided with a bulging portion that bulges away from the ridge ruled line facing the valley of the basic waveform.

  Further, the amplitude center line of the wavy cut line forming the tear band is inclined with respect to the ridge ruled line at the boundary between the elevation plate and the flat plate so that the center side of the elevation plate becomes higher.

  And in a die cutter for producing this corrugated cardboard box, in addition to a pressing member for putting the ridge line, a corrugated lead blade provided with a high blade portion and a low blade portion for putting a wavy score line of a tear band is provided, In order to form the bulging portion of the wavy cut line, the lead blade is provided with a bulging portion that curves away from the opposing pressing member.

  Further, in order to incline the amplitude center line of the wavy cut line forming the tear band with respect to the ridge ruled line at the boundary between the elevation plate and the plane plate so that the center side of the elevation plate becomes higher, Thus, the amplitude center line of the lead blade is inclined.

  In a corrugated cardboard box manufactured by such a mold, the corrugated cardboard is cut by a tear strip, the upper part is removed, and even if the product load acts as a tray, There is a bulging portion in the valley portion of the cut line that becomes the upper edge of this, and this bulging portion resists the moment caused by the load and prevents the corrugated cardboard from being bent, so that the strength is ensured.

  In addition, due to the inclination of the amplitude center line of the wavy cut line, the elevation plate whose center side is raised in the tray state resists the moment due to the load, and the strength increases, and buckling due to the accumulated load in the package state is less likely to occur. This also improves the effect of preventing torso swelling.

The perspective view which shows the goods packaging state by the cardboard box which concerns on embodiment of this invention The perspective view which shows the state made into the tray same as the above Surface view showing the blank of the cardboard box Enlarged view of the tear zone on the elevation plate in the boxed state Part A enlarged view of FIG. The perspective view which shows the principal part of the die cutting of a cardboard box same as the above Enlarged perspective view showing correspondence between lead blade and cutting Schematic cross-sectional view showing the cutting state with the lead blade The perspective view which shows the product packaging state by the conventional cardboard box The perspective view which shows the state made into the tray same as the above

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

  The cardboard box shown in FIG. 1 is a wrap round case in which 24 beverage cans C are arranged in four rows and arranged in four rows, and the upper portion of the box is removed as shown in FIG. Thus, in a tray state, the can C is exposed to enhance the display effect, and the can C can be easily taken out.

  As shown in FIG. 3, in this cardboard box blank, each pair of elevation plates 2 and plane plates 3 are alternately arranged via ridge ruled lines 1, and one of the elevation plates 2 via ridge ruled lines 1. The passage pieces 4 are continuously provided. The four corners of the flat plate 3 are cut obliquely.

  End plates 5 and 6 are connected to both ends of the upright plate 2 and the flat plate 3, and a chamfered plate 5 a is interposed between the upright plate 2 and the end plate 5.

  The elevating plate 2 is provided with an opening tear strip 7 extending in a direction parallel to the ridge line 1 between both ends, and the tear strip 7 further passes through the chamfered plate 5a and passes through the end of the end plate 5. It has reached the edge. 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.

  The tear band 7 in the upright plate 2 is formed by two wavy cut lines 7a that are periodically curved to have a substantially symmetrical shape so as to correspond to the diameter of the can C. Further, as shown in FIG. 4, the amplitude center line S of the cut line 7a is slightly with respect to the ridge ruled line 1 so that the center side of the elevation plate 2 (the cut start part 8 side of the tear band 7) is higher. It is inclined to.

  Each cut line 7a includes a full cut portion 7b penetrating the front and back of the cardboard and a half cut portion 7c in which the cardboard is cut from the back side to the middle in the thickness direction, and dotted connection portions 7d. It is a lead wire.

  Moreover, as shown in FIG.4 and FIG.5 in a box-making state, the cut line 7a is made into the shape which deform | transformed the basic waveform shown with a dashed-dotted line. This basic waveform is a shape that is periodically curved in a sinusoidal shape, and the top waveform close to the ridge ruled line 1 facing the upper side or the lower side of each of the basic waveforms of the upper and lower cut lines 7a is a valley and is far away. The top is a mountain.

  Each valley of the basic waveform is provided with a bulging portion 7e that bulges away from the opposing ridge ruled line 1, and similarly, each peak approaches the opposing ridge ruled line 1. An immersion part 7f is provided so as to be immersed. Further, the upper and lower two cut lines 7a have a substantially symmetrical shape.

  Here, the wavelength, which is the interval in the direction in which the amplitude center line S between the apexes of the adjacent valley portions of the basic waveform of the score line 7a extends, is preferably 40 mm to 80 mm, and is preferably matched to the diameter of the can C. Further, the wave height, which is the difference in height between the valley portion of the basic waveform and the top portion of the peak portion, should be 5 mm to 25 mm, and the height of the bulging portion 7e and the immersing portion 7f should be smaller than this.

  Moreover, as shown in FIG. 4, the cut start part 8 is formed by putting all cuts 8a penetrating the front and back of the cardboard into a deformed H-shape, and the horizontal line part below the cuts 8a is the cut line 7a. It is curved to correspond to the basic waveform.

  In addition, as shown in FIG. 3, the flat plate 3 on the opposite side of the passage piece 4 has two cut lines 3 a for opening in the vertically placed state and two for folding the flat plate 3 to widen the opening. Fold lines 3b and 3c are entered.

  In the die-cutting die D for manufacturing such a corrugated cardboard box, as shown in FIG. 6, a wave-like shape of the tear strip 7 together with a straight strip-shaped pressing member 10 for inserting the ridge line 1 of the upright plate 2 and the flat plate 3. A wavy lead blade 11 for entering the cut line 7a is provided, and subsequently, all cutting blades 12 for entering the cut 8a of the cut start portion 8 are provided.

  In order to form the bulging part 7e of the score line 7a, the lead blade 11 is provided with a protruding part 11d that curves away from the opposing pressing member 10, and in order to form an immersive part 7f of the score line 7a. A bay portion 11e that curves so as to approach the opposing pressing member 10 is provided.

  Further, in the state where the blank is assembled into a cardboard box, the lead blade 11 tilts the amplitude center line of the score line 7a with respect to the ridge ruled line 1 so that the center side of the elevation plate 2 becomes higher. On the other hand, the amplitude center line is inclined.

  As shown in FIG. 7, the lead blade 11 is alternately formed with the high blade portion 11a and the 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 inside.

  When punching a blank corrugated cardboard B with such a die, as shown in FIGS. 7 and 8, in the lead blade 11, the corrugated cardboard B supported by a support member 13 such as a sponge is moved from the back side to the front side. The low blade portion 11b cuts through the cardboard B 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 score line 7a are inserted.

  Further, the concave portion 11c does not cut the cardboard B, 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 cardboard B along the score line 7a. Is prevented.

  Here, the die for inserting the wavy cut line 7a as described above can be manufactured 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 the can C as shown in FIG. 1, a pair of elevation plates 2 and a plane plate are formed along the ridge line 1 using a wrap round caser. 3 are folded so as to face each other, the accumulated can C is wrapped, a peripheral wall is formed by joining the passage piece 4 and one flat plate 3, and the chamfer plate 5a is bent obliquely at the four corners of the box. Then, the end plates 5 and 6 are attached and sealed.

  In this cardboard box, the cut line 7a of the tear strip 7 is waved and the half cut 7c extending between the full cuts 7b is inserted from the back side of the cardboard, so that the cut line 7a acts as a hinge. Since the cardboard is bent accurately along the ridge line 1 of the upright plate 2 and the flat plate 3 without being bent inward along the cut line 7a, it is possible to prevent the occurrence of defective box making.

  Further, when the blank is manufactured, the cut line 7a of the tear band 7 and the cut 8a of the start portion 8 are put in the same die, so that the positional relationship between these is not shifted, and the liner cut in the conventional corrugator is performed. Compared to the manufacturing method in which the cut 8a is made later by a die cutter, 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 corrugated cardboard is cut without deviating from the cut line 7a, and the tear strip 7 is not cut off and cannot be opened easily. As shown in FIG. 2, it can be in a tray state.

  In the corrugated cardboard box as described above, even if a load is applied to a large number of cans C as a tray, the trough portion of the cut line 7a that becomes the upper edge of the upright plate 2 can be lifted by placing a hand on the bottom surface of both end portions. Since the bulging portion 7e is formed on the ridge portion 7 and the remaining height of the corrugated cardboard from the ridge ruled line 1 facing downward is increased, the resistance to the moment due to the load is increased, and the elevation plate 2 and the bottom flat surface are flattened. The effect that the bending of the cardboard in the face plate 3 is prevented and the strength is ensured is obtained.

  This effect is further improved by inclining the amplitude center line of the score line 7a so that the center side of the elevation plate 2 becomes higher as in the above embodiment.

  On the other hand, when a plurality of cardboard boxes are stacked in a state where the can C is packaged in the physical distribution process, the load of the upper cardboard box is applied to the lower cardboard box, but the tear strip 7 has a wavy cut line 7a. In addition, since the bulging portions 7e are provided in the valley portions of the upper and lower two wavy cut lines 7a, the bending of the elevation plate 2 is suppressed and the body bulges are suppressed as in the case of the box making described above. The effect of being prevented is obtained.

  This effect is further improved by inclining the amplitude center line of the score line 7a so that the center side of the elevation plate 2 becomes higher as in the above embodiment.

  As described above, the effect of improving the strength in the tray state can also be obtained by providing the valley bulged portion 7e only on the lower cut line 7a, and the amplitude center line of the cut line 7a. Can be obtained to some extent even if is set to be parallel to the ridge line 1. In addition, the effect of preventing swelling in the packaged state can be obtained to some extent under such conditions.

  By the way, in each said embodiment, although the cardboard box which has the chamfering board 5a in the ridge part was illustrated, the same structure is applicable also to the rectangular parallelepiped-shaped cardboard box with which the ridge part became a right angle.

  In addition, the wrap round type cardboard box is exemplified, but also in the slotted type cardboard box that seals by overlapping the flat plates extending from the upper and lower sides of the adjacent vertical plates, when the same tear band as described above is put in the vertical plate, Similar effects can be obtained.

DESCRIPTION OF SYMBOLS 1 Crest part ruled line 2 Elevation board 3 Plane board 3a Cut line 3b, 3c Fold line 4 Passage piece 5,6 End plate 5a Chamfering board 7 Tear strip 7a Cut line 7b Full cut part 7c Half cut part 7d Connecting part 7e Expansion Part 7f Immersion part 8 Cutting start part 8a Cut line 10 Pressing member 11 Lead blade 11a High blade part 11b Low blade part 11c Recessed part 11d Bay protruding part 11e Bay entry part 12 Full cutting edge 13 Support material B Corrugated cardboard C Can D Die cut S Amplitude center line

Claims (4)

The elevation plate (2) and the plane plate (3) are connected to each other via the ridge ruled line (1), and the tear plate (7) for opening is provided on the elevation plate (2) between the both ends. The band (7) is formed by two wavy cut lines (7a) that are periodically curved, and each cut line (7a) has a full cut (7b) that penetrates the front and back of the cardboard, and the cardboard from the back side. Make a lead wire with a half-cut part (7c) cut halfway in the thickness direction, and fold the elevation plate (2) and flat plate (3) along the ridge ruled line (1) to make a box, In a corrugated cardboard box with a tear band that is in a tray state along with tearing by the tear band (7),
Of the two wavy cut lines (7a) forming the tear band (7), at least the lower cut line (7a) is separated from the ridge ruled line (1) facing the valley of the basic waveform. A cardboard box provided with a bulging portion (7e) that bulges.   The corrugated cardboard box according to claim 1, wherein an amplitude center line of the wavy cut line (7a) forming the tear strip (7) is set so that the center side of the upright plate (2) becomes higher. A corrugated cardboard box characterized by being inclined with respect to the ridge ruled line (1) at the boundary with the flat plate (3). The elevation plate (2) and the plane plate (3) are connected to each other via the ridge ruled line (1), and the tear plate (7) for opening is provided on the elevation plate (2) between the both ends. The band (7) is formed by two wavy cut lines (7a) that are periodically curved, and each cut line (7a) has a full cut (7b) that penetrates the front and back of the cardboard, and the cardboard from the back side. The lead wire is intermittently connected to the half cut portion (7c) cut in the middle of the thickness direction, and at least the lower cut line (7a) of the two wavy cut lines (7a) forming the tear band (7) ) Has a shape with a bulging part (7e) that bulges away from the ridge ruled line (1) facing the valley of the basic waveform, and ridges the elevation plate (2) and the flat plate (3). A die-cutting die for a die cutter that manufactures a cardboard box with a tear band that is bent along the ruled line (1) and made into a tray state along with tearing by the tear band (7),
A corrugated lead having a high blade portion (11a) and a low blade portion (11b) for inserting the wavy cut line (7a) of the tear strip (7) together with the pressing member (10) for inserting the ridge line (1). The lead blade (11) is provided with a blade (11), and the lead blade (11) forms a bulging portion (7e) of the wavy cut line (7a), so that the protruding portion curved away from the opposing pressing member (10) (11d) A cardboard box punching die characterized by being provided.   4. The corrugated cardboard box according to claim 3, wherein the vertical plate (2) has an amplitude center line of the wavy cut line (7a) forming the tear strip (7) so that the central side of the vertical plate (2) is higher. Corrugated cardboard characterized in that the amplitude center line of the lead blade (11) is inclined with respect to the pressing member (10) in order to incline with respect to the ridge ruled line (1) at the boundary between the flat plate and the flat plate (3) Box cutting.

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