JP2015020783A - Easy-to-open cardboard box and cutting die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate opening by pulling of tear strips, while securing a pressure resistance of a cardboard box.SOLUTION: A cardboard box is opened by applying cut-lines 11 of liner cut in parallel to a corrugated fiberboard and forming a tear strip 12 sandwiched by the cut-lines 11, and then pulling the tear strip 12 from a cut starting part 13 and cutting the corrugated fiberboard. Stepwise crushed parts 14 crushing a core of the corrugated fiberboard are intermittently arranged vertically only along the cut-lines 11 positioning on the lower part among the cut-lines 11 arranged in upper and lower parts of the tear strip 12. An end side 14a, which is positioned on the terminal side of the tear strip 12 among end sides forming the circumference of each stepwise crushed part 14, is to be directed from the upper part of cut-line 11 to the diagonally downward from the starting-edge side of the tear strip to the terminal side thereof. A portion between the stepwise crushed parts 14 serves as a rib in the stacking, and the tear direction is corrected to the lower direction by the end side 14a of the stepwise crushed part 14 in the opening.

Description

  The present invention relates to a corrugated cardboard box that can be easily opened by pulling a tear strip formed by a cut line of a liner cut, and a punching die thereof.

  Conventionally, in Patent Document 1 shown below, as shown in FIG. 8, as a cardboard box for packaging an article such as a beverage can, an upright plate 51 and a flat plate 52 are connected in series, and this is arranged along a ruled line of a ridge. A wrap round type is described in which an article is wrapped by folding and sealed by overlapping and bonding an outer flap 54 extending from the end side of the flat plate 52 to an inner flap 53 extending from the end side of the elevation plate 51. .

  In this corrugated cardboard box, two cut lines 55 parallel to the horizontal direction are put by cutting the liner on the back surface side of the corrugated cardboard from the upright plate 51 to the inner flap 53, and the cut is made. A tear strip 56 for opening sandwiched between the lines of sight 55 is formed, and a cut-out portion 57 of the tear strip 56 is provided in the center portion of the elevation plate 51 by making a cut in a horizontal H shape.

  A corrugated portion 58 obtained by crushing the core of the corrugated cardboard from the back side is continuously provided along the tear strip 56, and the corrugated portion 58 is wider than the tear strip 56 so as to include the upper and lower score lines 55. It is supposed to be.

  In the above cardboard box, since the core of the corrugated board is loosened by the corrugated portion 58 at the portion of the tear strip 56, when opening the cardboard by cutting the corrugated board by pulling the tear strip 56 from the cut start portion 57, It becomes easy to tear along the cut line 55, the phenomenon that the tear band 56 is torn off in the middle is prevented, and the situation where opening is difficult is prevented.

JP 2012-254821 A

  However, in recent years, in consideration of the environment, the packaging has been made lighter, such as the use of corrugated cardboard boxes that have a corrugated core with a lower corrugated height than the conventional corrugated cardboard and a smaller basis weight of the base paper. If a corrugated box made of lightweight corrugated cardboard is provided with a crushed portion as described above, the pressure-resistant strength against the stacking load is lowered, and there is a possibility that the body bulge is likely to occur.

  In addition, lightweight corrugated cardboard has a large bonding area between the core step top and the liner due to the large number of steps per unit length of the core, and a hard core paper is used. Therefore, if the stepped portion is abolished, the tensile resistance of the tear zone increases, and it may be difficult to cut the cardboard.

  Accordingly, an object of the present invention is to make it easy to open a cardboard box by pulling a tear strip while ensuring the pressure-resistant strength of the cardboard box.

  In order to solve the above-described problems, the present invention forms a tear line between liner cuts parallel to the cardboard, forms a tear band sandwiched between the score lines, and pulls the tear band from the cut portion to remove the cardboard. In the corrugated cardboard box opened by cutting, a crushed portion obtained by crushing the core of the corrugated cardboard up and down along only the cut line located below among the cut lines arranged above and below the tear strip. Of the edges that are intermittently arranged and that surround each stepped portion, the edge located on the end side of the tear band is from above the cut line from the start side to the end side of the tear band. It was supposed to go diagonally downward.

  Further, in a die punching produced by punching a blank of such a corrugated cardboard box, in order to form the stepped portion, it corresponds to a score line below the tear band, along a virtual direction in which the score line extends. The pressing members for pressing the cardboard are intermittently provided, and each pressing member has an end surface corresponding to the end side located on the terminal side of the tear strip obliquely with respect to a virtual direction in which the score line extends. It was arranged to face.

  In the corrugated cardboard box according to the present invention, the corrugated portion obtained by crushing the core of the corrugated cardboard up and down along only the lower cut line among the cut lines aligned above and below the tear strip in the article packaging state. Are intermittently disposed, the portion between the collapsed portions becomes a rib, and the pressure-resistant strength against the stacked load is ensured.

  In addition, each crushed portion has an edge on the end side of the tear band from the start end side to the end side of the tear band, and is directed obliquely downward from above the cut line. When the tear band is pulled diagonally upward with the material placed on the floor, etc., even if the tear direction on the lower side of the tear band tends to deviate obliquely upward from the lower score line, The inclined edge of the stepped portion located at the position corrects the tearing direction downward, and tearing of the tear band is prevented.

  Furthermore, since the surface layer delamination where the liner on the surface of the corrugated cardboard deviates from the score line below the tear strip is prevented, the portion below the cut portion by the tear strip is used as a tray when displaying goods at the storefront. If so, it can be displayed with a beautiful appearance.

  Further, the die for producing this blank for the corrugated cardboard box only needs to add a pressing member of a small piece made of cork or the like for forming the stepped portion to the conventional die cut. Thus, the manufacturing cost does not increase so as to be a problem, and the increase in the manufacturing cost of the cardboard box is suppressed.

Back view of blank of easy-open cardboard box according to this invention Partial enlarged view showing the tear band and stepped portion as above The perspective view which shows the cutting die which manufactures the blank of a cardboard box same as the above The perspective view which shows the assembly state of a cardboard box same as the above Perspective view showing the opening process Partial enlarged view showing the corrugated board cutting process by the tear band same as above and reference drawing showing the cutting trajectory of the zipper-type score line Partial enlarged view showing a form in which the crushed portion is (a) trapezoidal and (b) triangular. Perspective view showing a conventional easy-open cardboard box

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

  The blank of this easy-open corrugated cardboard box shown in FIG. 1 has a thickness of about 2 mm, and a corrugated cardboard (Rengo Co., Ltd.) within the range of -2 + 2 steps with reference to 60 steps per 30 cm of cores. It is called “Delta Flute” in the company.

  In this blank, the elevation plate 1 and the plane plate 2 are alternately provided in pairs, and the passage piece 3 is provided on the outer side of the elevation plate 1 located at one end thereof. An inner end plate 4 is connected to both ends of the upright plate 1, and an outer end plate 5 is connected to both ends of the flat plate 2.

  In the upright plate 1 and the inner end plate 4, two parallel cut lines 11 of the liner cut are put on the cardboard liner which becomes the back side at the time of assembly so as to extend in the horizontal direction at the middle lower part in the height direction. A tear band 12 sandwiched between the cut lines 11 is formed, and an H-shaped cut through the front and back of the corrugated cardboard is provided in the vicinity of the center of the tear band 12 to provide a start portion 13 for the tear band 12. .

  In the elevation plate 1, the step of crushing the core of the corrugated board from the back side along the upper and lower portions of the two cut lines forming the tear band 12 only along the cut line 11 located below in the article packaging state. Due to the processing, the stepped portion 14 is intermittently disposed (enlarged in FIG. 2).

  These crushed portions 14 are formed in a rectangular shape, and the end side 14 a located on the end side of the tear band 12 among the end sides forming the periphery thereof is terminated from the cut start portion 13 that is the start end side of the tear band 12. In the direction of the inner end plate 4 which is the side, it is inclined so as to go obliquely downward from above the cut line 11.

  Further, in order to reduce the tear resistance in the bent state of this portion and induce the cutting at the boundary portion between the elevation plate 1 and the inner end plate 4 of the score line 11, the front and back of the corrugated cardboard are penetrated in a mountain shape. A cut 15 is made, and a leveling process is performed.

  Furthermore, at the end of the passage plate 3 and one flat plate 2 that overlaps with the assembled state, a partial increase in thickness on the top surface is suppressed, and stability in a stacked state is improved. For the purpose of illustration, stepping is applied.

  Such a blank is manufactured by punching out a cardboard sheet with a die cutter equipped with a punching die as shown in FIG. The cut line 11 of the liner cut forming the tear band 12 is entered in advance when the corrugated cardboard sheet is manufactured.

  In this die cutting, a cutting blade 22 for punching a blank outline is planted on a wooden substrate 21, a ruler member 23 for inserting a crease line is planted, and a cut start portion 13 of the tear strip 12 is formed. The cutting blade 24 and the cutting blade 25 for inserting the cut 15 at the ridge portion of the upright plate 1 and the inner end plate 4 are implanted.

  Then, in order to form the stepped portion 14, a rectangular parallelepiped pressing member 26 that presses the cardboard along the virtual direction in which the cut line 11 extends corresponds to the cut line 11 below the tear band 12. Each of the pressing members 26 is provided intermittently, and the end surface 26a corresponding to the end side 14a on the end side of the tear strip 12 is disposed so as to be inclined with respect to the virtual direction in which the score line 11 extends. ing.

  The pressing member 26 is made of a material in which cork is mixed in a sponge and is elastic but hard, so that even a corrugated cardboard having a strong core can be crushed. As the material of the pressing member 26, a hard sponge or plastic may be used depending on the properties of the corrugated cardboard to be crushed.

  In such a die-cutting, it is only necessary to add a small pressing member 26 made of cork, sponge, plastic or the like for forming the corrugated portion 14 to the conventional die-cutting. The manufacturing cost does not increase so as to become a problem, and the increase in the manufacturing cost of the cardboard box is suppressed.

  When assembling the blank manufactured by the above die cutting and packaging the article, as shown in FIG. 4, each pair of the elevation plate 1 and the plane plate 2 is folded into a rectangular tube shape, and the article is wrapped. The piece 3 and the end portion of the one flat plate 2 are bonded together, and the inner end plate 4 and the outer end plate 5 are sequentially bent and bonded together for sealing.

  In the corrugated cardboard box assembled and packaged in this way, the core of the cardboard is crushed up and down along only the lower cut line 11 among the cut lines 11 arranged above and below the tear strip 12. Since the stepped crushing portions 14 are intermittently disposed, the portions between the stepped crushing portions 14 become ribs, and the pressure resistance against the stacked load in the distribution process is ensured.

  On the other hand, when opening the cardboard box, as shown in FIGS. 5 and 6, the tear strip 12 is pulled from the cut-out portion 13 on the starting end side, and the cardboard of the elevation plate 1 is cut, The cardboard of the inner end plate 4 on the end side is cut.

  At the time of opening, when the tear strip 12 is pulled obliquely upward in the standing plate 1 with the cardboard box placed on the floor or the like, the tear direction on the lower side of the tear strip 12 changes from the lower cut line 11. The inclined end of the stepped portion 14 located on the terminal side of the tear strip 12 is the same as the case of the zipper-type cut line in which the hook-shaped cut shown in FIG. The side 14a corrects the tearing direction downward, and tearing of the tear band 12 is prevented.

  Furthermore, since the surface layer peeling that the liner on the surface of the corrugated cardboard deviates from the cut line 11 below the tear strip 12 is prevented, the portion below the cut portion by the tear strip 12 is placed on the tray when the article is displayed at the storefront. Can be displayed with a beautiful appearance.

  In the above embodiment, the rectangular stepped portion 14 is illustrated as being obliquely aligned along the lower cut line 11 of the tear band 12, but the stepped portion 14 is, for example, illustrated in FIG. ), As shown in (b), as shown in various shapes such as trapezoidal shape or triangular shape, the end side 14a located on the end side of the tear band 12 extends from the start end side to the end side of the tear band 12, It is good also as what goes to diagonally downward from the upper direction of the score line 11. FIG.

DESCRIPTION OF SYMBOLS 1 Elevation board 2 Plane board 3 Passage piece 4 Inner end plate 5 Outer end plate 11 Cut line 12 Tear strip 13 Cutting start part 14 Step crushing part 14a Edge 15 Cut 21 Substrate 22 Cutting edge 23 Ruled member 24, 25 Blade 26 Press member 26a End face

Claims (2)

  Insert a liner-cut score line (11) parallel to the cardboard to form a tear strip (12) sandwiched between the score lines (11), and then pull the tear strip (12) from the start (13) to corrugate In the corrugated cardboard box that is opened by cutting the tear strip (12), among the score lines (11) arranged above and below the tear strip (12), only along the score line (11) positioned below, Of the edges forming the periphery of each crushed portion (14), the edge located on the terminal side of the tear strip (12) (14) is disposed intermittently. 14a) is a corrugated cardboard box characterized in that it goes from the upper side of the cut line (11) to the lower side of the tear strip (12) from the start side to the end side.   In the punching die produced by punching the blank of the corrugated cardboard box according to claim 1, in order to form the stepped portion (14), the cut line (11) corresponding to the cut line (11) below the tear strip (12) A pressing member (26) that presses the cardboard is intermittently provided along a virtual direction in which the score line (11) extends, and each pressing member (26) is an end located on the end side of the tear strip (12). A cardboard box die-cutting, characterized in that the end face (26a) corresponding to the side (14a) is arranged so as to be inclined with respect to a virtual direction in which the cut line (11) extends.

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