JP2008247024A - Lead ruled blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead ruled blade which is able to surely cut without smashing a sheet material from the first stage of cutting. <P>SOLUTION: On the lead ruled line blade wherein a higher blade 11a for making a full cut part and a lower blade 11b for making a half-cut part are formed as to be alternatively intermeittent for making a lead ruled line for making a full cut part penetrating through the surface to the back side and a half cut part cutting a sheet material S till the halfway in the thickness direction such as a corrugated fiber paper or the like, a gradient is formed on the top edge of the lower blade 11b. As the sheet material S is cut from a higher part of the top edge of the lower blade 11b in order, the sheet material S such as the corrugated fiber paper or the like is not smashed strongly pushed, on making a box of a blank of the sheet material S, a trouble such as bending at a place excepting a defined position or a trunk expansion on piling can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lead ruler blade for inserting a lead ruler in which a full cut portion and a half cut portion are alternately interrupted in a sheet material such as cardboard.

  In general, as a wrap round cardboard box for packaging beverage cans, as shown in FIG. 8, a pair of standing plates 51 and flat plates 52 that are arranged in series 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 end plate 54 on the elevation plate 51 of the cardboard box. The center portion of the elevation plate 51 is provided with an end portion of the tear strip 56 at the time of opening. A cutting start portion 57 for picking is provided.

  Here, the tear band 56 is formed by two opposing straight cut lines 56a, and this cut line 56a is generally formed by a liner cut that cuts the liner on the back side when a corrugator is used to manufacture a corrugated cardboard material. However, in order to prevent displacement from the start portion 57, it is also possible to use a lead ruled by punching when blanks are punched.

  At this time, as shown in FIG. 9, a lead ruler blade 61 in which a high blade portion 61a and a low blade portion 61b with flat blade edges are alternately formed is provided in the die, and the corrugated cardboard sheet material S is formed by the high blade portion 61a. A full cut portion penetrating the front and back of the sheet material is inserted with a half cut portion cut into the middle of the thickness direction from the back side of the sheet material S by the low blade portion 61b, and the full cut portion and the half cut portion are alternately interrupted.

  However, when the lead ruler blade 61 as described above is used, the cardboard is crushed without being cut at the initial stage of cutting by the low blade portion 61b, and the blank is not the ridge ruled line 50 but the cut line 56a at the time of box making. There is a risk that the box will be bent, 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 lead ruler blade that is reliably cut from the initial stage of cutting without the sheet material being crushed at the half-cut portion.

  In order to solve the above-described problems, the present invention provides a lead material in which a full cut portion penetrating through the front and back of a sheet material such as cardboard and a half cut portion cut in the middle in the thickness direction are alternately interrupted. In order to make a ruled line, in a lead ruled blade in which a high blade part into which a full cut part is inserted and a low blade part into which a half cut part is formed alternately, a gradient is provided at the cutting edge of the low blade part.

  In the lead ruled blade according to the present invention, since the low blade portion is sequentially cut into the sheet material from the portion having a high cutting edge, the sheet material such as corrugated cardboard is not strongly pressed and crushed, and the box is made from a blank of the sheet material. At this time, it is possible to prevent the occurrence of defective box making due to bending other than the predetermined position, and it is possible to prevent the swelling of the box when the boxes are stacked.

  Also, when opening the box with the tear line cut line with this lead ruler, if the tear band is pulled from its starting part, the cardboard is cut so that the entire cut part is connected along the half-cut part. Can be opened easily without tearing along the way.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a corrugated cardboard box in which a score line of a tear band is made with a lead ruled blade according to the present invention will be described with reference to the accompanying drawings.

  This cardboard box is of the wrap round type used for packaging beverage cans, 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 symmetrical wavy cut lines 7a, and each cut line 7a includes all cut portions 7b penetrating the front and back of the cardboard, and the cardboard from the back side in the thickness direction. The half-cut portions 7c cut halfway are alternately interrupted, and a lead rule is provided in which a connection portion 7d without cut is provided between the full-cut portions 7b and the half-cut portions 7c. Moreover, 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.

  Further, by pressing from the front side of the corrugated cardboard and bulging to the back side, the trunk plate pressing lines 9 in the step direction perpendicular to the ridge ruled lines 1 are put in parallel with a plurality of intervals. ing.

  As shown in FIG. 2, in a die for punching a blank sheet from the back side in the die for manufacturing this cardboard box, a linear pressing member for inserting the ridge line 1 of the upright plate 2 and the flat plate 3 In parallel with 10, a wavy lead ruled blade 11 for entering the cut line 7 a of the tear band 7 is provided, and subsequently, all cutting blades 12 for entering the cut 8 a of the start portion 8 are provided.

  Further, the face plate that receives the blank sheet S from the front side at the time of punching is provided with a pressing member 13 for inserting the trunk portion pressing wire 9 in a direction orthogonal to the pressing member 10 of the punching die D, and the lead ruler blade 11 is the pressing member 10. It arranges corresponding to the mountain part which is closest to. Furthermore, the die D is provided with a receiving groove member 14 into which the tip 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. Further, the blade edge of the low blade portion 11b is provided with a gradient such that the central portion has a high convex shape.

  For example, when punching a cardboard sheet S having a thickness of about 2 mm, the blade height α of the high blade portion 11a is 0.7 mm, and the step β between the high blade portion 11a and the upper end of the low blade portion 11b is 0.2 mm. In addition, the step γ between the high blade portion 11a and the lower end of the low blade portion 11b may be set to 0.5 mm.

  When the blank sheet S is punched with such a die, as shown in FIG. 4, in the lead ruler blade 11, the high blade portion 11a penetrates the sheet S supported by the support material 15 such as cork 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.

  At this time, as shown in FIG. 3, the low blade portion 11b is sequentially cut into the sheet S from a portion having a high blade edge, so that the sheet S is not strongly pressed and crushed at the initial stage of the cutting. Further, the recess 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.

  In addition, since the cutting edge of the low blade portion 11b has a high convex shape at the center portion as in this example, it is equally cut from the sharp center portion to the left and right, so a stable cutting state is obtained. As shown in FIG. 5 (a), even if the central portion has a low concave shape or the shape is inclined from one side to the other side as shown in FIG.

  Moreover, as shown in FIG.5 (c), the shape which has three convex parts as shown in FIG.5 (d) in addition to the shape which has two convex parts on the blade edge of the low blade part 11b. If the shape has a plurality of convex portions, etc., the pressure applied at the initial stage of cutting is reduced, so that the cutting can be performed more stably, and the sheet S can be effectively prevented from being crushed or torn. .

  In addition, the blade edge of the low blade portion 11b may be curved in an arc shape or a wave shape in addition to the straight edge as described above, and the concave portion 11c may be omitted so that the connecting portion 7d is not provided on the cut line 7a. It may be.

  Such a lead ruler can be easily manufactured by a wire cut electric discharge machine, and can be manufactured not only for a flat plate die cutter but also for a rotary die cutter.

  Now, when assembling a blank punched with the above-described stamping and packaging a beverage can, a pair of elevation plates 2 are formed along a ridge line 1 as shown in FIG. 6 using a wrap round caser. Further, the flat plate 3 is bent, the accumulated cans C are 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 cardboard box, the cardboard is not crushed at the cut line 7a of the tear strip 7 at the half cut part 7c, so that the cut line 7a acts as a hinge as shown in FIG. Accordingly, the elevation plate 2 is less likely to be bent inwardly along the cut line 7a, and is accurately bent along the ridge line 1 with the plane plate 3, thereby preventing the occurrence of defective box making.

  Moreover, making the cut line 7a of the tear band 7 into a wave shape and inserting the half cut part 7c from the back side of the corrugated cardboard also contributes to prevention of bending at the cut line 7a of the elevation plate 2.

  Furthermore, since the cut line 7a of the tear strip 7 and the cut 8a of the cut-off portion 8 are put in the same die shape during the manufacture of the blank for the corrugated cardboard box, these positional relationships are not shifted, and the conventional corrugator is used. Compared with the manufacturing method in which the cut 8a is made with a die cutter after the liner cut, 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 by 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 a distribution process in a distribution process, a large load is applied to the lower cardboard box, but the cardboard is crushed at the half-cut portion 7c of the score line 7a. The fact that the tear band 7 is formed by two symmetrical wavy cut lines 7a prevents buckling of the elevation plate 2 at the cut lines 7a and prevents swelling of the body.

  Furthermore, since the trunk | drum press line 9 put into the elevation board 2 acts as a rib which is hard to bend to the bulging side, a trunk | drum swelling is prevented also by the trunk | drum press line 9. FIG.

  In each of the above embodiments, the case where a corrugated cut line is provided as a tear band in a cardboard box is illustrated, but when a straight cut line is used, if the above lead ruled blade is used, a half cut part It is possible to prevent the buckling strength from being lowered, and it is possible to prevent the occurrence of box-making defects and the swelling of the trunk during stacking.

  Further, not only corrugated cardboard but also a single paper such as paperboard, and a plastic sheet material such as polypropylene, can be scored by the same lead rule.

  Furthermore, this lead ruled blade is not only applied to the tear line cut line for the purpose of resisting buckling while ensuring cutability as in the above embodiment, but also has a folding bottom assembly, etc. Can be used also when putting a ruled line that is bent in the direction opposite to the cut side.

The reverse view which shows the blank of the cardboard box using the lead ruled blade which concerns on this invention The perspective view which shows the principal part of the cutting die provided with the lead ruler blade same as the above Schematic side view showing the cutting process with the lead ruler blade Schematic cross-sectional view showing the cutting state with the lead ruler blade Side view showing various forms of the lead ruler blade 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 which put the conventional score line Schematic side view showing the cutting process with a conventional lead ruler blade

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crest 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 part 9 Body press line 10 Pressing member 11 Lead ruler blade 11a High blade portion 11b Low blade portion 11c Concave portion 12 Full cutting blade 13 Press member 14 Receiving groove member 15 Support material D Cutting die S Sheet

Claims (3)

  In order to put a lead rule in which the sheet material is alternately interrupted with a full cut part penetrating the front and back and a half cut part cut in the middle of the thickness direction, a high blade part (11a) for inserting the full cut part and The lead ruler blade in which the low blade portions (11b) into which the half cut portions are formed are alternately formed, wherein the blade edge of the low blade portion (11b) is provided with a gradient.   The lead ruler blade according to claim 1, wherein the edge of the low blade portion (11b) has a convex shape at the center.   The lead ruler blade according to claim 1 or 2, wherein the edge of the low blade portion (11b) has a shape having a plurality of convex portions.

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