JP6337188B1 - Barbed material - Google Patents

Abstract

There is provided a ruled member capable of marking a ruled line at a high-accuracy and accurate position with respect to a cardboard sheet having various properties and reducing a defect rate of a cardboard box to be manufactured. A ruled member having a plurality of stepped stepped portions 12 that form a convex shape as a whole of the ruled part 11 on the surface of the ruled part 11 into which a ruled line for bending is inserted by pressing on a cardboard sheet. 2, the top ridges 13 are formed between the step portions 12 on both sides located near the center in the width direction of the ridge portion 11, and the plurality of side ridges 14 are formed on the surface of each step portion 12. 11 are formed side by side in the width direction so as to extend in the length direction, and a groove 15 is formed between the top ridge 13 and the side ridge 14 and between the adjacent side ridges 14, It is assumed that the strip 13 protrudes the largest in the pressing direction to the corrugated cardboard sheet as compared with the side projections 14 of the step portions 12 on both sides. [Selection] Figure 2

Description

  The present invention relates to a ruled member for placing a folding ruled line on a cardboard sheet.

  The corrugated cardboard sheet with liner paper bonded to both sides of the corrugated core paper is different from the corrugated core paper in the height, wave shape, thickness, quality, etc. There are many types having various properties depending on the combination with liner papers having different quality and the like, and some are as hard as interleaving paper.

  For example, the corrugated height of a typical core paper is 5 mm for A flute, 4 mm for C flute, 3 mm for B flute, 1.5 mm for E flute, 0.6 mm for F flute, G The flute is 0.5 mm, and the typical corrugated pitch ranges from about 8.5 mm for the A flute to about 1.8 mm for the G flute.

  The corrugated cardboard sheet is a double-sided corrugated sheet with a corrugated core paper as a single layer, a double-sided corrugated sheet with a combination of any two of these, and a double-sided double-sided corrugated sheet with any of these combined in three layers. There are corrugated cardboard sheets (triple wall sheets). The general thickness of such a corrugated cardboard sheet varies depending on the quality of the paper used, but it is about 0.5 mm to 15 mm, which is the height of the corrugated core paper plus the thickness of multiple liner sheets. It has become.

  And since the corrugated cardboard sheet tends to increase in elasticity and rigidity as it becomes thicker, it becomes difficult to put a ruled line by pressing. Further, in the case of a double-sided corrugated cardboard sheet or a double-sided corrugated cardboard sheet, it is not known which portions of the corrugated core paper having a space in each layer coincide with each other to form the corrugated cardboard sheet.

By punching such various types of cardboard sheet, for example, when forming the blank A ₁ for cardboard boxes formed as shown in FIG. 7, the outer shape punching blades for contouring of the blank A ₁ wooden base the is attached to the inside of the outer punching blades, by attaching a押罫member to put ruffled vertical ruled lines L ₁ and the horizontal ruled line L ₂ of the blank a ₁ to form a cutting die, a border cardboard sheet by the cutting die I try to punch while putting it in. In some cases, a ruled line is formed by a ruled line forming apparatus provided with a roll-shaped ruled roll.

Here, vertical lines L ₁ of the blank A ₁ is substantially parallel to the longitudinal direction stage W of core paper S in which is formed a step-like waveform of the corrugated sheet A, whereas the horizontal ruled line L ₂ is in the above It extends in the lateral direction perpendicular to the step W of the core paper S.

As押罫member put vertical line L ₁ and the horizontal ruled line L ₂ as described above in the cardboard sheet A, as shown in FIG. 8 is generally used. This ruler member 50 has one edge of a metal strip as a ruled part 51, and the corrugated part 51 pushes one surface of the corrugated cardboard sheet A into the corrugated part of the core paper S. by crushing, and forms a vertical line L ₁ and the horizontal ruled line L ₂ of the groove-like.

  The strip material of the ruled member 50 is usually about 20 and several millimeters in height in the vertical direction, and the width dimension, which is the thickness between both side surfaces, is 0.5 mm to depending on the properties of the cardboard sheet. 10mm one can be used properly.

Meanwhile, the ruled line member 50 shown in FIG. 8 has an arcuate shape in which the surface of the ruled part 51 has a convex cross-sectional shape, and has a smooth shape with no unevenness over the entire length. Since it has great elasticity to be restored against pressure, when the surface of the cardboard sheet A is pushed in the thickness direction by the ruled part 51 of the ruled member 50 to form the ruled lines L ₁ and L ₂ , the cardboard In many cases, the pressing force of the ruled portion 51 against the surface of the sheet A is dispersed and the cardboard sheet A is defeated and the clear ruled lines L ₁ and L ₂ cannot be put.

In particular, when forming a vertical line L ₁ parallel to the stage W of the corrugating medium S is what would crush any part corrugated in the corrugating medium S in押罫51 minutes for no, the shape of crushed also vary, sharpness of vertical lines L ₁ is different from that formed, it may not be possible to fold the cardboard sheet a with high precision.

Further, depending on the portion of the core paper S to be crushed by the ruled part 51, the surface of the ruled part 51 may be corrugated sheet because the surface of the ruled part 51 has a smooth shape without irregularities. according bites into the surface of the a, slipped surface of the cardboard sheet a is on the surface of the押罫portion 51, since the relative vertical line L ₁ may move displaced in the lateral direction, exactly that expected on the surface of the cardboard sheet a There is a problem that a ruled line cannot be formed at a proper position or a meander line is formed on the formed ruled line.

Here, in the blank A ₁ shown in FIG. 7, the panel P ₁ and the panel P ₄ are bent along two vertical ruled lines L ₁ on both sides of the three vertical ruled lines L ₁ parallel to the step W. Then, the passage piece P ₅ continuously formed on the panel P ₁ on one side is overlapped with the edge of the panel P ₄ on the other side, and the overlapping part is bonded to be folded flat. It is considered a corrugated cardboard box.

At this time, if the bending accuracy at vertical lines L ₁ is poor, or occur relative slope on one side of the panel P ₁ and the other side panel P _4, vertical lines L ₁ constituting the ridge of the diagonal positions An error may occur in the dimensions between the two, making it impossible to form a highly accurate corrugated cardboard box, and when the peripheral wall is opened into a rectangular tube, a box with a distorted shape may be formed. Cardboard boxes are defective.

  In order to eliminate such inconvenience and to obtain a highly accurate bend, a ruled roll as shown in FIG. 9 described at the lower right end in FIG. It is possible.

  The ruled roll as the ruled member 60 is rotated by being pressed against the corrugated cardboard sheet, and the staircase part 61 on the entire outer periphery contacting the corrugated cardboard sheet has a convex shape that faces outward as a whole. In order to form a shape, a flat stepped portion 62 with no unevenness on the surface is provided on each of the left and right steps, and the top convexity projecting outward between the stepped portions 62 located on the left and right sides closer to the center. It is supposed to form Article 63. In the ruled member 60, the boundary portion between the adjacent step portions 62 on both the left and right sides is an upright surface orthogonal to the horizontal step portion 62, and the corner portions of the step portion 62 are angular.

  Also in FIG. 5 of Patent Document 2 below, as shown in FIG. 10, a ruled part 71 on the entire outer periphery is directed outwardly as a whole on the outer peripheral surface of the ruled roll as the ruled member 70. In order to form a convex stepped shape, the surface has a flat stepped portion 72 with no irregularities on the left and right sides, and the top ridge 73 between the stepped portions 72 located on the left and right sides closer to the center. Is formed. In the ruled member 70, the boundary portions of the adjacent step portions 72 on both the left and right sides are inclined surfaces that obliquely intersect the horizontal step portion 72, and the corner portions of the step portions 72 are chamfered to have roundness. ing.

  When the ruled lines 60 and 70 are used to make a ruled line, the surface of the corrugated cardboard sheet pressed by the ruled parts 61 and 71 is first pushed by the tops of the top ridges 63 and 73, and is crushed. Since the stepped portions 62 and 72 on both sides are gradually crushed while being positioned, the phenomenon that the corrugated cardboard sheet is displaced to both sides of the top ridges 63 and 73 is suppressed to some extent, and the positional accuracy of the ruled line is improved to some extent. It is thought.

  Further, in the following Patent Document 3 relating to an application having the same applicant and inventor as the present patent application, a ruled member 80 as shown in FIG. 11 is proposed. In the ruled member 80, the ruled part 81 that presses the corrugated cardboard sheet is provided with one top ridge 82a that is located in the center in the width direction and has the highest top in the illustrated direction, and the top ridge. A plurality of side ridges 82b are provided on both sides of the ruled part 81 in the width direction across the 82a, and the top part gradually decreases toward the side part of the ruled part 81. The surface of the part 81 is formed in an uneven shape. The top ridges 82 a and the side ridges 82 b protrude radially from one point on the center line 1 in the width direction of the ruled member 80.

  Then, the entire ruled part 81 has an arcuate virtual curve C in which the tops of the top ridges 82a and the side ridges 82b are centered on one point on the center line l and form a mountain shape outward. By contacting from the inside, the top of the top ridge 82 a is formed into a mountain-shaped convex shape with the top of the ruled part 81 facing outward. Further, a concave groove 83 recessed in the height direction is formed between the top ridge 82a and the side ridges 82b on both sides and between adjacent ones of the side ridges 82b. The side surfaces between the tops of the strips 82a and the side ridges 82b and the bottoms of the concave grooves 83 are inclined surfaces.

  The height of the side ridge 82b from the bottom of the groove 83 in the ruled part 81 of the ruled member 80 is in the range of 0.05 mm to 1.0 mm, and is preferably about 0.1 mm. , Has become relatively low. Further, Patent Document 3 below also describes an embodiment in which only the top ridge 82a is slightly protruded from the virtual curve C.

  When the ruled line member 80 is used to make a ruled line, the surface of the corrugated cardboard sheet pressed by the ruled part 81 is first pushed in by the top part of the top ridge 82a and is inclined on both sides while being crushed. Smoothly enters the concave groove 83 along the surface, and sequentially abuts on the side ridges 82b on both sides thereof, along the inclined surface of the side surface of each side ridge 82b, and adjacent side ridges 82b. It smoothly enters the concave groove 83 between them and follows the surface of the ruled part 81 in a wavy shape. For this reason, the phenomenon in which the surface of the corrugated cardboard sheet is displaced on both surfaces of the top protrusion 82a on the surface of the ruled part 81 is effectively suppressed to some extent.

  Moreover, in the following patent document 4 relating to an application in which the applicant and the inventor are the same as the present patent application, as shown in FIG. 12, the direction intersecting the top ridge 82a on each of both sides of the top ridge 82a. A plurality of intersecting grooves 84 extending in the length direction of the ruled part 81 are provided at intervals in the length direction, and the side grooves 82b positioned on both sides of the top protrusion 82a are divided by the intersecting grooves 84 and What has become is described.

  If such a cross groove 84 is provided, the surface of the pressed corrugated cardboard sheet also enters the cross groove 84, so that the surface of the corrugated cardboard sheet extends in the length direction of the top protrusion 82 a on the surface of the ruled part 81. The phenomenon of shifting is also suppressed, and the processing accuracy of ruled lines can be further increased.

US Patent Application Publication No. 2009/0203509 Japanese Utility Model Publication No. 49-34406 Japanese Patent No. 5902353 Japanese Patent No. 5894343

  However, in the ruled members 60 and 70 as shown in FIGS. 9 and 10, since the surfaces of the step portions 62 and 72 on both the left and right sides of the top ridges 63 and 73 are flat in the width direction, the top ridges 63. , 73, when the corrugated sheet is pressed by the stepped portions 62, 72 after the corrugated sheet is pushed in by the top portions, 73, 73, there is a problem that the ruled members 60, 70 are easily displaced in the width direction.

Further, in the ruled member 80 as shown in FIGS. 11 and 12, the height of the tops of the side ridges 82b on both sides gradually decreases in the direction shown in FIG. Therefore, when forming the vertical ruled line L ₁ (see FIG. 7) parallel to the step of the core paper in the corrugated cardboard sheet having a large corrugated pitch of the core paper such as A flute, In some cases, the top ridge 82a or the side ridge 82b enters between the adjacent tops of the corrugations, and the core paper cannot be strongly crushed without being affected by the corrugations.

In addition, when the paper quality of the liner paper or the core paper is hard, or when both side surfaces of the core paper have a steep slope between the top and the bottom, both sides from the top protrusion 82a There is a possibility that the crushing force by the side ridges 82b located in the part away from the direction becomes weak and a sufficient crushing action cannot be obtained. In particular, in the case of the vertical ruled line L ₁ (see FIG. 7), there is a problem that the corrugated cardboard sheet cannot be bent into a clear and clean straight line at an accurate position unless sufficient crushing action is obtained for the above-described reason. is there.

  Therefore, the present invention can insert a clear and clean straight ruled line at a high-precision and accurate position on a corrugated cardboard sheet having various properties, and the cardboard sheet can be accurately and easily placed at the center in the width direction of the ruled line. It is an object of the present invention to provide a ruled member that can be bent in a straight line and can reduce the defective rate of a cardboard box to be manufactured.

In order to solve the above-described problems, the present invention has a plurality of stepped step portions that form a convex shape as a whole of the ruled portion on the surface of the ruled portion that puts a ruled line for bending by pressing the cardboard sheet. In the formed ruled member,
A top ridge extends between the step portions on both sides located near the center in the width direction of the ruled portion, and a plurality of side ridges extend in the length direction of the ruled portion on the surface of each step portion. In this way, a groove is formed between the top ridge and the side ridge and between the adjacent side ridges.
The top ridge protrudes the largest in the pressing direction to the corrugated cardboard sheet as compared with the side ridges of the step portions on both sides.

  In addition, the top ridges are provided so as to be parallel to the center of the ruled portion in the width direction.

  In the ruled member according to the present invention, when the cardboard sheet is pushed into the ruled part, the top ridges first strongly crush the cardboard sheet at the center part in the width direction of the ruled line, and then each step part on both sides sequentially in stages. The cardboard sheet is crushed while pressing the cardboard sheet with the tops of the side ridges formed in a row in the width direction of the ruled part.

  As a result, even when the corrugated sheet is thick and the corrugated pitch of the core paper is large, or when the paper quality is hard, the lateral displacement of the corrugated sheet during the creasing process is reliably prevented, and the correct position can be obtained. A ruled line is formed in which the central portion in the width direction is most strongly crushed, and both sides thereof are crushed so that the pressing strength gradually decreases in the width direction.

  In particular, when forming a vertical ruled line, a plurality of side ridges are arranged in each step portion side by side in the width direction of the ruled portion, which is a direction crossing the stepped side surface of the core paper. Therefore, even if the stepped side surface of the core paper is inclined with a steep slope, one of the side ridges of each step portion strongly presses the stepped side surface of the core paper, and the corrugated shape of the core paper The part is sufficiently crushed.

  In this way, the corrugated cardboard sheet is not affected by the strength of the paper quality of the material, the corrugated height and pitch of the core paper, and the structure and paper strength of the double-sided cardboard sheet, the double-sided cardboard sheet or the double-sided cardboard sheet. Regardless of whether a vertical ruled line or a horizontal ruled line is further formed, the surface can be sufficiently crushed without exerting an excessive tension on the surface, and a clear ruled line can be put at an accurate position.

  Then, the corrugated cardboard sheet can be accurately and easily folded into a clean straight line at the center in the width direction of the ruled line, and the defect rate of the cardboard box to be manufactured can be reduced.

  In addition, when two top ridges are provided in parallel, the corrugated cardboard sheet has a high rigidity made of hard paper, or a double-sided corrugated cardboard sheet having three layers of corrugated core paper. Even if it is considerably thick, the cardboard sheet is first strongly crushed with a certain width by the two top ridges, and then sequentially crushed by the side ridges of each step. The line can be clearly and surely broken without breaking, and can be accurately bent at a predetermined position such as the center in the width direction of the line.

(1A) Schematic cross-sectional view showing a state before crease entry, (1B) Schematic cross-sectional view showing a crease entry state, by a platen die cutter to which a crease member according to the present invention is attached The figure which shows the cross-sectional outline of the ruled part of the ruled member which concerns on 1st Embodiment of this invention. The figure which shows the cross-sectional outline of the ruled part of the ruled member which concerns on 2nd Embodiment of this invention. (4A) Plan view schematically showing the ruled portion of the ruled member of the third embodiment in which intersecting grooves are formed in the first embodiment, and (4B) (4A) cross section along line XX Figure The apparatus schematic side view which shows the example of application to the rotary die cutter of the ruled member which concerns on each said embodiment The apparatus schematic side view which shows the example of application to the ruled unit of the ruled member which concerns on each said embodiment The figure which shows the blank for cardboard box formation A perspective view showing a conventional general ruled member The figure which shows the cross-sectional outline of the ruled part of the ruled member of patent document 1 The figure which shows the cross-sectional outline of the ruled part of the ruled member of patent document 2 The figure which shows the cross-sectional outline of the ruled part of the ruled member of patent document 3 The top view which shows typically the ruled part of the ruled member of patent document 4

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

As shown in FIG. 1, a platen die cutter that uses the ruled member 10 according to the present invention includes a stainless steel cutting plate 1 that supports a corrugated sheet A having both sides of a corrugated core paper S, The crease die 2 facing above is contacted and separated. The crease die 2 is formed with a grooved slit 4 in a base 3 made of wooden plywood by laser processing or the like, and a cutting edge (not shown) for punching the outline of the blank of the cardboard box into the slit 4 and a crease member 10 is press-fitted. As shown in FIG. 7, the ruled line member 10 forms ruled lines such as a vertical ruled line L _{1 in} a direction parallel to the step W and a horizontal ruled line L _{2 in} a direction perpendicular to the step W on the cardboard sheet A. It will be. As described above, the corrugated core paper S has various sizes, and the corrugated shape has a gentle slope on the side surface between the top and bottom. There are various types of shapes.

  The ruled member 10 as shown in FIG. 1 has a vertical dimension of about 20 and several millimeters, a thickness between both side surfaces that is a dimension in the width direction is 0.5 mm to 10 mm, and the length is appropriately dimensioned. A metal strip plate material is used as a material, and one end portion in the vertical direction of the strip plate material is a ruled portion 11. And the ruled line member 10 made into an appropriate dimension according to the properties of various corrugated cardboard sheets A is used.

  As shown in FIG. 2 with the ruled portion 11 facing upward, the entire shape of the ruled portion 11 is formed on the surface of the ruled portion 11 of the ruled member 10 according to the first embodiment of the present invention. As shown, a plurality of step portions 12 are formed side by side in the width direction of the ruled portion 11 so as to form a convex stepped shape. The step portion 12 includes a step portion 12A that is the first step in the pressing direction to the corrugated cardboard sheet A disposed near the center of the ruled portion 11 in the width direction, and the ruled portion 11 with respect to the step portion 12A. It is comprised from the step part 12B used as the 2nd step arrange | positioned on the outer side of the width direction.

  In the illustrated example, the step portion 12 is illustrated as having two steps in the vertical direction on both sides of the ruled portion 11, but may be further multi-stepped as long as it is stepped.

  Moreover, although the boundary part of step part 12A, 12B adjacent on the upper and lower sides becomes the inclined surface inclined so that it might protrude inward toward the center side of the width direction of the ruled part 11, this boundary part is As long as there is no corner where the corrugated cardboard sheet A is torn during the crease process, it may be vertical.

  And between the step parts 12A on both sides closer to the center in the width direction of the ruled part 11, the top ridge 13 is tapered by the inclined surfaces on both sides inclined in the opposite directions toward the pressing direction to the cardboard sheet A. The protrusions 11 are formed so as to extend in the length direction of the ruled part 11, and a plurality of (two in the illustrated example) side ridges 14 are provided on the surfaces of the step parts 12 A and 12 B on both sides. Of the ruled part 11 so as to extend in the length direction of the ruled part 11 in a state of protruding in a tapered manner by inclined surfaces on both sides inclined in opposite directions toward the pressing direction to the corrugated cardboard sheet A, respectively. Are formed side by side.

Between adjacent side ridges 14 of each stepped portion 12A, 12B, a concave groove 15 is formed which is recessed in the height direction of the ruled member 10 by inclined surfaces on both sides inclined in opposite directions. In addition, a groove 15 is formed in the boundary portion between the top ridge 13 and the step portion 12A on both sides thereof and the boundary portion between the adjacent step portion 12A and the step portion 12B by the inclined surfaces on both sides inclined in opposite directions. Yes. With such a configuration, when the vertical ruled line L ₁ (see FIG. 7) is formed, the side ridges 14 are arranged so as to cross the wavy inclined side surface of the core paper S.

  The top ridge 13 protrudes the largest in the height direction of the ruled member 10, that is, in the pressing direction with respect to the cardboard sheet A, compared to the top of the side ridges 14 of the stepped portions 12 </ b> A on both sides. At the time of crease forming, the top of the top ridge 13 first comes into contact with the cardboard sheet A.

  The protrusion amount α of the top ridge 13 with respect to the groove 15 of the step 12A on both sides thereof is larger than the protrusion β of the side ridge 14 from the bottom of the groove 15 in each step 12.

  As described above, the tops of the top ridges 13 and the side ridges 14 are the outward direction, that is, the pressing direction to the corrugated cardboard sheet A, with the entire ruled part 11 being the top of the top ridges 13 as the tops of the ruled parts 11. It is arranged so as to form a mountain-shaped convex shape toward.

  The protrusion amount β is preferably in the range of 0.05 mm to 1.0 mm, and may be determined as appropriate depending on the properties of the corrugated cardboard sheet A, the width of the ruled part 11, the number of steps and the shape of the step part 12, and the like. May be set larger than the protrusion amount β.

  Moreover, although the protrusion height of the top part of the side ridge 14 in each step part 12A, 12B shown in figure is the same, the protrusion height of the top part of these side part ridges 14 is arrange | equalized to the exact same height. For example, the height deviation up to about ± 0.5 mm can be regarded as substantially the same height, so that there is no problem in terms of operation and effect. Further, it is not necessary that the depths of the concave grooves 15 in the stepped portions 12A and 12B are exactly the same. For this reason, in manufacturing, it is not necessary to pursue excessive high accuracy, and the cost can be suppressed.

  Furthermore, as shown in FIG. 2, the top ridge 13 and the side ridge 14 protrude in parallel to the central axis in the height direction of the ruled member 10, but the center in the height direction of the ruled member 10. You may protrude so that it may extend radially from a point with an axis.

  The tops of the top ridges 13 and the side ridges 14 are chamfered to have roundness to prevent breakage of the cardboard sheet A when the ruled line L is inserted into the cardboard sheet A as will be described later. The bottom of the concave groove 15 between them is also chamfered so as to have roundness. Moreover, the side surface of the top ridge 13 and the side ridge 14 is an inclined surface that continues from the top to the bottom of the groove 15, and the surface of the ruled part 11 has a smooth wave shape.

  The chamfered shapes of the top ridges 13, the tops of the side ridges 14, and the grooves 15 may be polygonal shapes. Further, the top ridge 13 that protrudes most in the pressing direction to the corrugated cardboard sheet A is most strongly pressed and easily damaged, and therefore it is preferable to chamfer the top part. 14 does not need to be chamfered because the corrugated cardboard sheet A is not pushed as hard as the top ridge 13.

  When the ruled line member 10 is used to place a ruled line L in the corrugated cardboard sheet A with a platen die cutter as shown in FIG. 1, the ruled part of the ruled line member 10 is shown in FIG. The crease die 2 is attached to the platen die cutter so that 11 faces downward, and the crease die 2 is brought close to the cutting plate 1.

In this processing, as shown in FIG. 1 (1B), the ruler member 10 is configured to reliably prevent the lateral movement of the cardboard sheet A when the cardboard sheet A is pushed by the ruled part 11. First, the top ridge 13 strongly crushes the cardboard sheet A at the center position of the ruled line L, and then, first, the cardboard sheet is formed at the tops of the plurality of side ridges 14 formed on the both sides 12A of the first stage. Crushing while pressing A, and then step by step while pressing the cardboard sheet A at the top of the plurality of side ridges 14 formed on the stepped portions 12B on both sides of the second step, vertical line _{L 1} and the horizontal ruled line _{L 2} or the like ruled lines L (see FIG. 7) is formed.

Accordingly, even when the corrugated sheet A is thick and the corrugated pitch of the core sheet S is large or the paper quality is hard, the lateral movement of the corrugated sheet A during the creasing process is surely prevented, and accurate. The vertical ruled line L ₁ and the horizontal ruled line L ₂ that are crushed most strongly at the center in the width direction and crushed so that the pressing strength gradually decreases in the width direction on both sides (see FIG. 7). The ruled line L is formed.

Further, particularly when forming a vertical line L _1, the step portions 12A, since each of the plurality of side ridges 14 and 12B are arranged side by side in a direction transverse to the side surface of the stage shape of the corrugating medium S Even if the stepped side surface of the core paper S is inclined steeply, one of the side ridges 14 strongly presses the stepped side surface of the core paper S in each of the step portions 12A and 12B. Then, the corrugated portion of the core paper S is sufficiently crushed.

In this way, the cardboard sheet A has a structure and paper strength such as a double-sided corrugated sheet, a double-sided corrugated sheet, and a double-sided corrugated sheet, regardless of the strength of the material paper and the corrugated height and pitch of the core paper S. Regardless of whether the ruled line L to be formed is the vertical ruled line L ₁ or the horizontal ruled line L ₂ (see FIG. 7), the surface is sufficiently crushed without applying excessive tension to the surface. Thus, a clear ruled line L can be entered at an accurate position.

  And the corrugated board sheet | seat A comes to be correctly and easily bend | folded linearly in the center part of the width direction of the ruled line L, and the defect rate of the cardboard box manufactured can be reduced.

  In the illustrated example, the top ridge 13 is located at the center in the width direction on the surface of the ruled part 11, but when there is no need to bend at the center of the ruled line L, the top ridge 13 is provided. May be displaced in either the left or right direction corresponding to a predetermined bending position, and the left and right sides of the top ridge 13 may have an asymmetric width.

  Moreover, although the thing which the number of the side ridges 14 of each of the left and right step portions 12 across the top ridge 13 is illustrated, the number of the side ridges 14 is different in the left and right step portions 12. It may be. In particular, when the corrugated cardboard sheet A is folded, when one side of the ruled line L is fixed and the other side is swung, or when both ends are bent at different folding speeds, the corrugated cardboard sheet A follows the ruled line L. It is preferable to change the number of the left and right side ridges 14 so as to be bent evenly.

  Further, as the number of the side ridges 14 increases, the contact area of the cardboard sheet A with the concavo-convex portion increases, so that the lateral shift of the cardboard sheet A can be more reliably prevented. If the number is too large, a large number of side ridges 14 will be formed on the ruled member 10 having a small width dimension, so that it takes time to manufacture the ruled member 10 and the cost increases. Become. Furthermore, the hard and strong surface of the corrugated cardboard sheet A becomes difficult to follow along the irregularities, and a ruled line having a normal shape is not formed. Therefore, the number of the side ridges 14 may be appropriately determined according to the width dimension of the ruled member 10 and the properties of the corrugated cardboard sheet A.

  The number of steps 12 and the height of the steps 12 may be determined as appropriate depending on the properties of the cardboard sheet A, the dimensions of the ruled portion 11 in the width direction, and the number of steps of the steps 12 may not be the same.

  In the ruled part 11, a peak in which the tops of the top ridges 13 and the side ridges 14 protrude the most from the tops of the top ridges 13 regardless of the number of steps and the height of the step parts 12. Since the convex shape of the shape is arranged, the cardboard sheet A smoothly enters the surface of the ruled part 11 when the ruled line L is formed, and the cardboard sheet A does not move laterally and is not torn, Processing for forming the ruled line L is performed.

  Moreover, in the said 1st Embodiment, although the top convex strip 13 has illustrated one thing, like the 2nd Embodiment shown in FIG. 3, the top convex strip 13 is the width direction of the ruled part 11 Two in parallel at the same height near the center may be provided so that the groove 15 is formed between the top ridges 13.

  As described above, when the two top ridges 13 are provided in parallel, the corrugated cardboard sheet A has a high rigidity made of hard paper, or the wavy core paper S has three layers. Even when the sheet is quite thick like a double-sided cardboard sheet, the cardboard sheet A is first strongly crushed with a certain width by the two top ridges 13, and then the side ridges 14 of each step 12. Therefore, the ruled line L can be clearly and reliably inserted without breaking the corrugated cardboard sheet A, and can be accurately bent at the center in the width direction of the ruled line L. If the cardboard sheet A having such a condition is pressed by the ruled member 10 with the top ridge 13 being pressed, the cardboard sheet A may be torn.

  If the number of the top ridges 13 is too large, the center portion of the ruled line L is thickened and blurred, and on the contrary, it is impossible to fold at an accurate position. Therefore, the number of the top ridges 13 is plural. Even in this case, about two are preferable. However, when the corrugated cardboard sheet A is very thick, the number may be three or more, and may be determined as appropriate according to the properties of the corrugated cardboard sheet A.

  Further, by forming the respective surfaces of the tops of the top ridges 13 and the side ridges 14 in a smooth concavo-convex shape, the cardboard sheet A is prevented from being broken or laterally displaced during ruled line formation. Also good.

  Further, as in the third embodiment shown in FIG. 4 based on the first embodiment, the ruled part 11 has a plurality of extending in the direction intersecting the top ridge 13 on both sides of the top ridge 13. The cross grooves 16 may be provided at intervals in the length direction of the ruled part 11, and the side ridges 14 on both sides of the top ridge 13 may be divided by the cross grooves 16.

  If such a crossing groove 16 is provided, when pressing the cardboard sheet A, the surface of the cardboard sheet A enters the crossing groove 16, so that the contact surface between the ruled part 11 and the cardboard sheet A becomes large, The cardboard sheet A is prevented from shifting in the length direction of the ruled member 10, and the surface of the cardboard sheet A is brought close to the top ridge 13 and is strongly crushed by the top ridge 13. .

  For this reason, when a cardboard box A is manufactured by bending the cardboard sheet A, the accuracy of the folding position on the ruled line L is further improved, and the defect occurrence rate during manufacturing can be significantly reduced. Further, even when at least one of the side ridges 14 is divided by the short intersecting grooves 16, the same effect can be obtained.

  Note that the cross grooves 16 on both sides of the top ridge 13 of the ruled part 11 do not need to be aligned in the length direction of the top ridge 13 and may be staggered. Further, although the cross groove 16 is illustrated as being inclined with respect to the top ridge 13, the cross groove 16 may extend in a direction orthogonal to the top ridge 13.

  In each of the above embodiments, as the thickness of the corrugated cardboard sheet A to be processed is increased, the size in the width direction of the ruled part 11 is increased, and a large number of step parts 12 are provided on both sides of the top ridge 13. It is preferable that the side ridge 14 of the book is provided.

  By the way, in each of the above embodiments, the crease type ruled member 10 mounted on the platen die cutter has been exemplified. However, the ruled portion 11 as in each of the above embodiments has a rotary die as shown in FIG. You may apply to the roll-shaped ruled member 10 with the width | variety of the crease type | mold mounted | worn with a cutter being large.

  The rotary die cutter is equipped with a semi-arc-shaped and wide crease die 22 along the outer periphery of a die roll 21 disposed opposite to the anvil roll 20, and a wide wooden base curved in the arc shape of the crease die 22. The anvil roll 20 is fixedly provided with a cutting blade 24 and an arc-shaped ruled member 10 having a predetermined length having the same width dimension (0.5 mm to 10 mm) as in the first to third embodiments. The corrugated cardboard sheet A is fed between the die roll 21 and punched into a predetermined shape by the cutting blade 24, and the cardboard sheet A is subjected to a crease forming process by the ruled part 11 of the ruled member 10.

  Further, for example, a crease roll of a crease unit as shown in FIG. 6 used for folder gluer is provided with a crease part 11 having a width dimension (0.5 mm to 10 mm) as in the above embodiments. The ruled line member 10 may be used.

  This crease unit has a pair of rotary shafts 31 and 32 that rotate in opposite directions on the downstream side of a pair of upper and lower conveying rollers 30 that send the corrugated cardboard sheet A in the direction of the arrow. A corrugated member 10 is attached as a ruled roll, a receiving roll 33 having a smooth surface with no irregularities is attached to the lower rotary shaft 32, and the corrugated cardboard sheet A fed between the ruled member 10 and the receiving roll 33 is attached to the corrugated cardboard sheet A. A ruled process is performed.

  As described above, even in the ruler member 10 that feeds the cardboard sheet A and applies the crease process to the cardboard sheet A as it rotates, the ruled part 11 has the shape as in each of the above embodiments, so A clear ruled line can be put in the position, and the defect rate of the manufactured cardboard box can be reduced.

A Corrugated sheet A ₁ Blank L Ruled line L ₁ Vertical ruled line L ₂ Horizontal ruled line S Core paper W Stage 1 Cutting plate 2 Ruled mold 3 Base 4 Slit 10 Ruled member 11 Ruled part 12 (12A, 12B) Step part 13 Top ridge 14 Side ridge 15 Groove 16 Cross groove 20 Anvil roll 21 Die roll 22 Crease mold 23 Base 24 Cutting blade 30 Conveying rollers 31, 32 Rotating shaft 33 Receiving roll

Claims (1)

It consists only of one metal strip with a width of 0.5 mm to 10 mm,
A ruled line in which a plurality of stepped step parts (12) forming a convex shape as a whole of the ruled part (11) are formed on the surface of the ruled part (11) for putting a ruled line for bending by pressing on the cardboard sheet. In member (10),
Between the step portions (12) on both sides located near the center in the width direction of the ruled portion (11), a top protrusion (13) is formed, and a plurality of side protrusions are formed on the surface of each step portion (12). The strips (14) are formed side by side in the width direction so that the extending directions do not intersect with each other so that the strips (14) extend in the length direction of the ruled part (11), and the top projections (13) and the side projections (14 ) And between adjacent side ridges (14), a concave groove (15) is formed, and the height of the top of the side ridge (14) is the same in each step (12). And
The top ridge (13) protrudes the largest in the pressing direction to the corrugated cardboard sheet compared to the side ridge (14) of the step (12) on both sides ,
The tops of all the top ridges (13) and the side ridges (14) are arranged in a convex shape with the tops of the top ridges (13) as the tops of the ruled parts (11),
The top ridge (13) first crushes the corrugated cardboard sheet, and then a plurality of side ridges of the same height formed on both side steps (12A) following the top ridge (13) ( 14) and a plurality of side ridges (14) of the same height formed on the next step portion (12B) continuing in both directions, and the cardboard sheet is crushed step by step sequentially. A ruled line member.

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