JP2019059032A - Ruler member - Google Patents

Abstract

To provide a ruler member which can form a ruled line at an exact position in corrugated cardboard sheets of various shapes with a high accuracy, and can reduce a failure rate of corrugated cardboard boxes which are manufactured.SOLUTION: A ruler member 10 in which plural step-wise step parts 12, which form a convex as a whole of a ruler part 11, are formed on a surface of the ruler part 11 which forms a ruled line for folding onto a corrugated cardboard sheet by pressing. In the ruler member, a top ridge 13 is formed between both side step parts 12 which are positioned near a center in a width direction of the ruler part 11, and plural side ridges 14 are so formed on a surface of each step part 12 as to respectively extend in a lengthwise direction of the ruler part 11, a concaved groove 15 is formed between the top ridge 13 and the side ridge 14, and between adjacent side ridges 14, and the top ridge 13 most projects in a corrugated cardboard sheet pressing direction compared to the side ridges 14 of both side step parts 12.SELECTED DRAWING: Figure 2

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a creased member for forming a crease in a corrugated cardboard sheet.

  Corrugated cardboard sheets in which liner paper is attached to both sides of a corrugated core sheet have different core heights, thickness, etc., which are different in height, shape, thickness, quality, etc. of the wave formed in steps. There are many types having various properties depending on the combination with the liner paper having different qualities and the like, and there is also a material whose hardness is as hard as the paper.

  For example, the corrugation height of a common 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 For flutes, it is 0.5 mm, and the pitch of a typical corrugation ranges from about 8.5 mm for A flutes to about 1.8 mm for G flutes.

  In addition, the corrugated cardboard sheet is a double-sided corrugated cardboard sheet in which corrugated corrugated core paper is a layer, a double-sided corrugated cardboard sheet in which any of these is combined to form two layers, and any one of these is combined to form double-layered double-layered sheets. There is a corrugated sheet (triple wall sheet) and the like. The general thickness of such a corrugated sheet also varies depending on the quality of the paper used, but it is about 0.5 mm to 15 mm in which the thickness of a plurality of liner sheets is added to the corrugated height of the core sheet. It has become.

  And since a corrugated-cardboard sheet tends to become large in elasticity and rigidity as it becomes thick, it becomes difficult to put the ruled line by pressure. Moreover, in the case of a double-sided corrugated sheet or a double-sided corrugated sheet, it is not known which part of the corrugated shape of the core paper having the space portion in each layer matches each other to form the corrugated sheet.

For example, when forming a blank A ₁ for forming a cardboard box as shown in FIG. 7 by punching out such various types of cardboard sheets, an outline punching blade for forming a contour of the blank A _{1 on} a 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 it while inserting it. Moreover, there are also cases where a ruled line is formed by a ruled line forming device provided with a roll-like scribing 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 orthogonal to the steps W of the core sheet 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. The creased portion of the core sheet S is formed by setting one edge portion of the metal strip material as the creased portion 51 and pushing one surface of the corrugated cardboard sheet A by the creased portion 51. by crushing, and forms a vertical line L ₁ and the horizontal ruled line L ₂ of the groove-like.

  The strip plate material of the creased member 50 usually has a height in the vertical direction of about 20 mm or so, and a width dimension which is a plate thickness between both side faces is 0.5 mm to The 10mm one can be used properly.

By the way, in the creased member 50 shown in FIG. 8, the surface of the creased portion 51 has a circular arc shape having a convex cross-sectional shape and a smooth shape without unevenness over the entire length, while the corrugated cardboard sheet A is pressed Since the surface of the corrugated cardboard sheet A is pushed in the thickness direction by the creased portion 51 of the creased member 50 to form the ruled lines L ₁ and L ₂ because it has large elasticity to resist against pressure and is formed. In many cases, the pressing force of the creased portion 51 against the surface of the sheet A is dispersed, losing the repulsion of the corrugated cardboard sheet A, and it is often impossible to insert sharp creases L ₁ and L ₂ .

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.

Furthermore, the surface of the creased portion 51 is a corrugated cardboard sheet depending on the portion of the center core sheet S crushed by the creased portion 51 due to the smooth shape without irregularities on the surface of the creased portion 51 As the surface of the corrugated cardboard sheet A slips on the surface of the creased portion 51 and may shift in the lateral direction with respect to the vertical crease L _{1 as} it bites into the surface of A, the planned accuracy on the surface of the corrugated cardboard sheet A There is a problem that a ruled line can not be formed at a certain position or a meander occurs in 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 the two vertical ruled lines L ₁ on two sides among the three vertical ruled lines L ₁ parallel to the step W is the edge of one passage pieces formed continuously with the side of the panel P ₁ P ₅ and the other side of the panel P ₄ are superimposed by the overlapping portions are bonded, folded flat And a 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 occurs in the dimension between the two, and a high-precision corrugated box can not be formed, and when the peripheral wall is opened in a square tube shape, a distorted box may be formed. Cardboard boxes are defective.

  In order to eliminate such a disadvantage and to obtain a highly accurate bending, as a creased member, a scribing roll as shown in FIG. 9 described at the lower right end in FIG. 20 of Patent Document 1 below is used. It is conceivable.

  The creased roll as the creased member 60 is pressed against the corrugated cardboard sheet to be rotated, and the entire outer circumferential creased portion 61 in contact with the corrugated cardboard sheet has a convex shape facing outward as a whole. In order to form a shape, it has a flat stepped portion 62 without unevenness on the surface and has two steps respectively on the left and right sides, and a convex portion protruding outward between the stepped portions 62 located on the left and right sides closer to the center Article 63 is considered to be formed. In this creased member 60, the boundary between adjacent steps 62 on the left and right sides is an upright surface orthogonal to the horizontal step 62, and the corners of the steps 62 are angular.

  Further, also in FIG. 5 of the following Patent Document 2, as shown in FIG. 10, on the outer peripheral surface of the scribing roll as the crease member 70, the creased portion 71 of the entire outer periphery is directed outward as a whole. In order to form a step-like shape having a convex shape, a flat step portion 72 without unevenness on the surface is provided with two steps respectively on the left and right, and the top ridge 73 between the step portions 72 located on the left and right sides near the center. What has formed is described. In this creased member 70, the boundary between adjacent step portions 72 on each of the left and right sides is an inclined surface that obliquely intersects the horizontal step portions 72, and the corners of the step portions 72 are chamfered so as to have roundness. ing.

  When the creased processing is performed by the creased members 60 and 70, the surface of the corrugated cardboard sheet pressed by the creased portions 61 and 71 is first pushed by the tops of the top ridges 63 and 73 and crushed. Since the corrugated sheet is gradually squeezed by the steps 62 and 72 on both sides while being positioned, the phenomenon of the corrugated sheet shifting in both directions of the top ridges 63 and 73 is suppressed to some extent, and the positional accuracy of the ruled lines is improved to some extent It is thought that.

  Further, in the following Patent Document 3 according to the application of which the present patent application and the applicant and the inventor are the same, a creased member 80 as shown in FIG. 11 is proposed. In this creased member 80, the creased portion 81 for pressing the corrugated cardboard sheet has a single top convex strip 82a positioned at the center in the width direction and having the highest peak in the direction shown in the drawing, and this convex ridge A plurality of side ridges 82b are provided parallel to both sides of the creased portion 81 in the width direction of the creased portion 82a with the top portions gradually decreasing toward the sides of the creased portion 81, thereby forming the creases. The surface of the portion 81 is formed in a concavo-convex shape. The top ridges 82 a and the side ridges 82 b radially project from one point on the center line 1 in the width direction of the creased member 80.

  Then, the whole of the creased portion 81 is an arc-shaped virtual curve C having a peak shape extending outward with the tops of the top ridges 82a and the side ridges 82b centered on one point on the center line l. By being in contact from the inside, the top of the top ridge 82 a is formed in a convex shape with a mountain shape facing outward as the top of the creased portion 81. In addition, a recessed groove 83 which is recessed in the height direction is formed between the top ridge 82a and the side ridges 82b on both sides thereof and between adjacent ones of the side ridges 82b. The side surface between the top of each of the ridges 82a and the side ridges 82b and the bottom of the recessed groove 83 is an inclined surface.

  The height of the side ridges 82b from the bottom of the concave groove 83 in the creased portion 81 of the creased member 80 is in the range of 0.05 mm to 1.0 mm, preferably about 0.1 mm. , Is relatively low. Moreover, in the following Patent Document 3, an embodiment in which only the top ridges 82a are slightly protruded from the imaginary curve C is also described.

  When a crease is made with such a crease member 80, the surface of the corrugated cardboard sheet pressed by the crease portion 81 is first pushed by the top of the top ridges 82a and squeezed while being crushed The grooves 83 smoothly enter the grooves 83 along the surface, and sequentially abut on the side ridges 82b on both sides of the side ridges 82b. The grooves 83 smoothly enter the recessed grooves 83 between them and follow the surface of the creased portion 81 in a wavelike manner. For this reason, the phenomenon in which the surface of the corrugated cardboard sheet is shifted to the both sides of the top ridges 82a on the surface of the creased portion 81 is effectively suppressed to some extent.

  Further, in the following patent document 4 relating to an application in which the present patent application and the applicant and the inventor are the same, as shown in FIG. 12, a direction intersecting the top ridges 82a on each side of the top ridges 82a. And a plurality of crossing grooves 84 extending in the longitudinal direction of the creased portion 81, and the side grooves 82b positioned on both sides of the top ridge 82a are divided by the crossing grooves 84. What has been described.

  If such a cross groove 84 is provided, the surface of the pressed cardboard sheet also enters the cross groove 84, so the surface of the corrugated sheet is in the longitudinal direction of the top ridges 82a on the surface of the creased portion 81. The phenomenon of displacement is also suppressed, and the processing accuracy of the ruled lines can be further enhanced.

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

  However, in the crease members 60 and 70 as shown in FIGS. 9 and 10, 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. When the corrugated cardboard sheet is pressed by the steps 62 and 72 after the corrugated cardboard sheet is pushed in by the tops of the upper and lower portions 73, 73, there is a problem that the widthwise direction of the crease members 60 and 70 is easily shifted.

Further, in the case of the creased member 80 as shown in FIGS. 11 and 12, the heights of the tops of the side ridges 82b on both sides gradually become lower toward the side of the creased portion 81 in the direction shown in FIG. Therefore, when forming a longitudinal ruled line L ₁ (see FIG. 7) parallel to the steps of the core paper, it is possible to use the core paper in a corrugated sheet having a large corrugated corrugated core like the A flute. The top ridges 82a or the side ridges 82b may enter between adjacent tops of the corrugations so that the core paper can not 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 step shape of the core paper are steep between the top and the bottom, etc. The crush force by the side ridges 82b located in the part away to the side becomes weak, and there is a possibility that sufficient crush action can not be obtained. In particular, in the case of the vertical crease L ₁ (see FIG. 7), there is a problem that the corrugated cardboard sheet can not be bent into a clear and clean straight line at the correct position unless sufficient crush action is obtained for the above reasons. is there.

  Therefore, according to the present invention, it is possible to put clear and clean straight lines in a precise position with high accuracy for corrugated sheets of various properties, and the corrugated sheets can be accurately and easily made in the widthwise center of the lines. It is an object of the present invention to provide a creased member which can be bent in a straight line so as to reduce the defective rate of a manufactured cardboard box.

In order to solve the problems as described above, according to the present invention, a plurality of stepped steps having a convex shape as a whole of the creased portion is formed on the surface of the creased portion where the creased line is made by pressing the corrugated cardboard sheet. In the formed creased member,
Top ridges extend between the step portions located on the widthwise center of the creased portion, and a plurality of side ridges extend in the length direction of the crease portion on the surface of each step portion Are formed side by side in the width direction, and grooves are formed between the top ridges and the side ridges and between the adjacent side ridges,
The top ridges are projected to the largest extent in the pressing direction to the corrugated sheet as compared with the side ridges of the step portions on both sides.

  The top ridges are provided so as to be parallel to each other near the center in the width direction of the creased portion.

  In the creased member according to the present invention, when the corrugated sheet is pressed in the creased portion, the top ridge first squeezes the corrugated sheet strongly at the central portion in the width direction of the ruled line, and then the steps are sequentially stepped on both sides. The corrugated cardboard sheet is crushed while the corrugated cardboard sheet is held down by the tops of the side ridges formed in a plurality along the width direction of the creased portion.

  As a result, even when the thickness of the corrugated cardboard sheet is large and the corrugated pitch of the core paper is large or the paper quality is hard, the lateral displacement of the corrugated cardboard sheet at the time of scoring can be reliably prevented, so that accurate positioning can be achieved. The central portion in the width direction is most strongly crushed, and both sides thereof are formed with a creased line so that the pressing strength is reduced stepwise in the width direction.

  In particular, when forming a vertical ruled line, a plurality of side ridges are arranged in the width direction of the creased area, which is a direction crossing the side surface of the step-like shape of the core paper, in each step. Therefore, even if the side surface of the step shape of the core paper is steeply inclined, any side ridges of each step strongly press the side surface of the step shape of the core paper, and the corrugation of the core paper Department is crushed enough.

  Thus, regardless of the strength and weakness of the paper quality of the material and the height and pitch of the corrugation of the core paper, the strength and weakness of the structure and paper quality such as double-sided corrugated sheets, double-sided corrugated sheets or double-sided corrugated sheets Furthermore, regardless of whether the vertical or horizontal ruled lines are formed, the surface can be sufficiently crushed without exerting excessive tension on the surface to put sharp ruled lines in precise positions.

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

  Also, if two top ridges are provided in parallel, such as when the corrugated cardboard sheet is a rigid paper made of hard paper, or a double-sided corrugated cardboard sheet made of three layers of corrugated core paper. Even if it is quite thick, the corrugated cardboard sheet is first strongly crushed with a certain width by the two top ridges and then successively crushed by the side ridges of each step, so It is possible to make a ruled line clearly and reliably without breaking the frame, and to bend accurately at a predetermined position such as the center in the width direction of the ruled line.

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

  Hereinafter, embodiments of the present invention will be described based on the attached drawings.

As shown in FIG. 1, a platen die cutter using the creased member 10 according to the present invention comprises a stainless steel cutting plate 1 supporting a corrugated cardboard sheet A on both sides of which a corrugated core sheet S is a layer; It contacts and separates with the marking die 2 which opposes the upper direction. The scribing mold 2 forms a groove-like slit 4 on a base 3 made of wooden plywood by laser processing or the like, and the slit 4 is a creased member together with a cutting blade (not shown) for punching out the outline of a cardboard box blank. It is what press-fits ten. As shown in FIG. 7, the creased line L _{1 in} a direction parallel to the row W, a horizontal line L _{2 in} a direction orthogonal to the row W, etc. are formed on the corrugated cardboard sheet A by the creased member 10. It will be. As described above, there are various sizes of the corrugated core S, and the corrugated shape is steep if there is a gentle slope on the side between the top and the bottom. There are various types of slopes.

  The height of the creased member 10 as shown in FIG. 1 is about 20 mm in height in the vertical direction, and 0.5 mm to 10 mm in thickness between both sides in the width direction. The metal strip material made of metal is used as the material, and one end of the strip material in the vertical direction is used as the creased portion 11. Then, in accordance with the various properties of the corrugated cardboard sheet A, the creased member 10 manufactured to an appropriate size is used.

  As shown in FIG. 2 with the creased portion 11 facing upward, the entire shape of the creased portion 11 is formed on the surface of the creased portion 11 of the creased member 10 according to the first embodiment of the present invention. A plurality of step portions 12 are formed side by side in the width direction of the creased portion 11 so as to have a convex step shape. The stepped portion 12 includes a stepped portion 12A which is the first step in the pressing direction of the corrugated cardboard sheet A disposed closer to the center in the width direction of the creased portion 11, and the folded portion 11 with respect to the stepped portion 12A. The second step 12B is provided on the outer side in the width direction of the second step 12B.

  In the illustrated example, two steps each having the steps 12 in the vertical direction on both sides of the creased portion 11 are illustrated.

  Further, the boundary portion between the step portions 12A and 12B adjacent to each other in the upper and lower portions is an inclined surface inclined so as to protrude inward toward the center side in the width direction of the creased portion 11. If there is no corner where the corrugated cardboard sheet A is torn during scoring, it may be vertical.

  And between the step parts 12A on both sides near the center in the width direction of the creased part 11, the top ridges 13 are tapered by the inclined surfaces on both sides inclined in the opposite direction in the pressing direction to the cardboard sheet A. It is formed to extend in the longitudinal direction of the creased portion 11 in a state of projecting in a shape, and a plurality of (two each in the illustration) side ridges 14 are formed on the surface of each step 12A, 12B on both sides. The width direction of the creased portion 11 is such that it extends in the lengthwise direction of the creased portion 11 in a state of projecting in a tapered shape by the inclined surfaces on both sides inclined in opposite directions toward the pressing direction to the corrugated sheet A respectively. It is formed side by side.

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

  The top ridges 13 project most in the height direction of the creased member 10, that is, in the pressing direction with respect to the corrugated cardboard sheet A, as compared with the tops of the side ridges 14 of the step 12A on both sides. The tops of the top ridges 13 first come into contact with the cardboard sheet A at the time of scribing.

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

  As described above, with regard to the tops of the top ridges 13 and the side ridges 14, the whole of the creased portion 11 is in the outward direction with the top of the top ridges 13 as the top of the creased portion 11, that is, the pressing direction It is arrange | positioned so that the convex shape of a mountain shape may be made toward the direction.

  The amount of protrusion β is preferably in the range of 0.05 mm to 1.0 mm, and may be appropriately determined depending on the properties of the corrugated cardboard sheet A, the width dimension of the creased portion 11 and the number and shape of the steps of the step portion 12, etc. Is set to be larger than the protrusion amount β.

  Moreover, although the projection height of the top of the side ridge 14 in each step 12A, 12B shown in the figure is the same, the projection height of the top of these side ridges 14 is exactly the same height. There is no problem in the effect because the deviation of height up to about ± 0.5 mm can be regarded as substantially the same height, for example. In addition, the depths of the recessed grooves 15 in the step portions 12A and 12B do not have to be exactly the same. For this reason, it is not necessary to pursue excessive high precision in manufacturing, and the cost can be suppressed.

  Furthermore, as shown in FIG. 2, although the top ridges 13 and the side ridges 14 protrude parallel to the central axis of the creased member 10 in the height direction, the center of the creased member 10 in the height direction It may project so as to extend radially from a certain point of the axis.

  Then, the tops of the top ridges 13 and the side ridges 14 are chamfered so as to have roundness in order to prevent breakage of the corrugated cardboard sheet A when making the crease L in the corrugated cardboard sheet A as described later. The bottom of the concave groove 15 between them is also chamfered to have roundness. Further, the side surfaces of the top ridges 13 and the side ridges 14 are inclined surfaces continuing from their tops to the bottom of the concave groove 15, and the surface of the creased portion 11 is smooth and wavy.

  The chamfered shapes of the top ridges 13, the tops of the side ridges 14, and the concave grooves 15 may be polygonal. In addition, since the top ridge 13 most projecting in the direction of pressing on the cardboard sheet A is the most likely to press the cardboard sheet A the most strongly and break it, it is preferable to chamfer its top, but the side ridges are preferable. 14 does not have to be chamfered as the corrugated cardboard sheet A is not pressed as hard as the top ridges 13.

  When making a crease L in a corrugated cardboard sheet A with a platen die cutter as shown in FIG. 1 by the above-mentioned creased member 10, as shown in FIG. 1 (1A), the creased portion of the creased member 10 The scribing mold 2 is mounted on a platen die cutter so that the point 11 is directed downward, and the scribing mold 2 is brought close to the cutting plate 1.

In this processing, as shown in FIG. 1 (1B), when the creased member 10 presses the corrugated cardboard sheet A at the creased portion 11, the corrugated sheet A is prevented from being shifted in the lateral direction with certainty. The top ridge 13 first squeezes the corrugated cardboard sheet A strongly at the center position of the crease L, and then, first, the cardboard sheet at the top of the plurality of side ridges 14 formed on the steps 12A on both sides of the first stage. By pressing and crushing A, and then pressing the corrugated cardboard sheet A while pressing the corrugated sheet A at the tops of a plurality of side ridges 14 formed on the steps 12B on both sides of the second step sequentially and in stages, vertical line _{L 1} and the horizontal ruled line _{L 2} or the like ruled lines L (see FIG. 7) is formed.

As a result, even when the thickness of the corrugated cardboard sheet A is large and the corrugated pitch of the core sheet S is large or the paper quality is hard, the lateral shift movement of the corrugated cardboard sheet A at the time of scoring can be reliably prevented and accurate. center in the width direction is crushed strongest Do position, vertical ruled lines L ₁ and the horizontal ruled line L ₂ or the like stepwise pressure intensity both sides in the width direction is crushed so as to reduce (see FIG. 7) The ruled line L of 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 side surface of the step-shaped side of the inner core sheet S is steeply inclined, one of the side ridges 14 in each of the step portions 12A and 12B strongly presses the side surface of the step-shaped side of the center core sheet S The corrugations of the core sheet S are sufficiently crushed.

Thus, regardless of the strength and weakness of the paper quality of the material and the height and pitch of the corrugation of the core sheet S, the strength and weakness of the structure and paper quality such as double-sided corrugated sheets, double-sided corrugated sheets or double-sided corrugated sheets In addition, 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 exerting excessive tension on the surface. Therefore, sharp ruled lines L can be put in the correct position.

  Then, the corrugated cardboard sheet A can be accurately and easily bent in a straight line at the central portion in the width direction of the crease L, and the defect rate of the manufactured corrugated cardboard box can be reduced.

  In the illustrated example, the top ridges 13 are located at the center in the width direction on the surface of the creased portion 11, but if it is not necessary to bend at the center position of the ruled line L, the top ridges 13 May be shifted in either the left or right direction corresponding to the predetermined bending position, and the right and left sandwiching the top ridge 13 may have an asymmetric width.

  Further, although the number of side ridges 14 of each of the left and right stepped portions 12 sandwiching the top ridges 13 is the same, the number of side ridges 14 is different in the left and right shoulders 12. It may be In particular, when folding the corrugated cardboard sheet A, one side of the ruled line L is fixed, the other side is swung, or both ends are bent at different bending speeds. It is preferable to change the number of the side ridges 14 on the left and right so as to bend evenly.

  Further, the larger the number of side ridges 14, the larger the contact area of the corrugated cardboard sheet A with the concavo-convex portion, so that lateral displacement of the corrugated cardboard sheet A can be prevented more reliably. If the number of side ridges 14 is formed on the creased member 10 with a small width, the manufacturing of the creased member 10 is time-consuming and cost increases. Become. Furthermore, the hard and strong surface of the corrugated cardboard sheet A is difficult to follow along the unevenness, and the ruled line of the normal shape is not formed. Therefore, the number of the side ridges 14 may be appropriately determined depending on the width dimension of the creased member 10, the properties of the corrugated cardboard sheet A, and the like.

  The number of steps and the height of the step 12 may be appropriately determined depending on the properties of the corrugated cardboard sheet A, the dimension in the width direction of the creased portion 11, etc. Furthermore, the number of steps of the step 12 may not be the same.

  In the creased portion 11, regardless of the number of steps and the height of the step 12, the crests of the top ridges 13 and the side ridges 14 as a whole are peaks at which the tops of the top ridges 13 are most protruded as a whole. Because of the convex arrangement of the shape, the corrugated cardboard sheet A smoothly enters the surface of the creased portion 11 when forming the ruled line L, and the corrugated cardboard sheet A does not shift laterally and does not break. A process is performed to form the ruled line L.

  Further, in the first embodiment, although one top ridge 13 is illustrated, as in the second embodiment shown in FIG. 3, the top ridge 13 is in the width direction of the creased portion 11. Two grooves may be provided in parallel at the same height near the center so that the recessed 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 may be made of hard paper with high rigidity, or the corrugated middle core paper S may be formed in three layers. Even in the case of a considerably thick double-sided corrugated sheet, the corrugated 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 Thus, the creased line L can be clearly and surely inserted without breaking the corrugated cardboard sheet A, and the sheet can be accurately bent at the center in the width direction of the creased line L. If the top ridge 13 presses the corrugated cardboard sheet A under such conditions with the single crease member 10, the corrugated cardboard sheet A may be torn.

  If the number of the top ridges 13 is too large, the center of bending of the ruled line L becomes thick and blurred, and it becomes impossible to fold at the correct position. Therefore, the number of the top ridges 13 is plural. Even in the case where it is set to about two, it is preferable, but in the case where the corrugated cardboard sheet A is very thick, etc., it may be three or more, and may be appropriately determined according to the properties of the corrugated cardboard sheet A.

  In addition, by forming the surface of each of the tops of the top ridges 13 and the tops of the side ridges 14 in a smooth concave and convex shape, it is possible to prevent the corrugated sheet A from being torn or shifted in the lateral direction when forming a ruled line It is also good.

  Furthermore, as in the third embodiment shown in FIG. 4 based on the first embodiment, the creased portions 11 extend in the direction intersecting with the top ridges 13 on both sides of the top ridges 13 respectively. The cross grooves 16 may be provided at intervals in the lengthwise direction of the creased portion 11 so that the side ridges 14 on both sides of the top ridge 13 are divided by the cross grooves 16.

  If such an intersecting groove 16 is provided, the surface of the corrugated cardboard sheet A enters the intersecting groove 16 when pressing the corrugated cardboard sheet A, so the contact surface between the creased portion 11 and the corrugated cardboard sheet A becomes large, The displacement movement of the corrugated cardboard sheet A in the lengthwise direction of the creased member 10 is prevented, and the surface of the corrugated cardboard sheet A is moved closer to the top ridge 13 and is strongly crushed by the top ridge 13 .

  For this reason, when manufacturing the corrugated box by bending the corrugated sheet A, the accuracy of the bending position at the ruled line L is further improved, and the defect occurrence rate at the time of manufacturing can be remarkably reduced. Further, even if at least one of the side ridges 14 is divided by the short cross groove 16, the same function and effect can be obtained.

  The crossing grooves 16 on both sides of the top ridge 13 of the creased portion 11 do not have to be aligned in the length direction of the top ridge 13 and may be staggered. Moreover, although the thing in which the cross groove 16 inclines with respect to the top ridge 13 is illustrated, the cross groove 16 may be extended in the direction orthogonal to the top ridge 13.

  In each of the above embodiments, the larger the thickness of the corrugated sheet A to be processed is, the larger the dimension in the width direction of the creased portion 11 is, and the large number of stepped portions 12 on both sides of the top ridge 13 It is preferable that the side ridges 14 of the book be provided.

  By the way, although the above-mentioned each embodiment illustrated about the squeeze type | mold crease member 10 with which a platen die cutter is mounted | worn, the creased part 11 like said each embodiment is a rotary die as shown in FIG. The width of the scoring type attached to the cutter may be large and may be applied to the roll-like score member 10.

  The rotary die cutter mounts a semicircular arc-shaped, large-width creasing mold 22 along the outer periphery of the die roll 21 disposed opposite to the anvil roll 20, and the arched curved wood wide base of the creasing mold 22 The cutting blade 24 and the arc-shaped creased member 10 of a predetermined length having the same width dimension (0.5 mm to 10 mm) as the first to third embodiments are fixed to the anvil roll 20. The corrugated sheet A is fed between the die roll 21 and punched into a predetermined shape by the cutting blade 24, and the corrugated sheet A is subjected to scribing processing by the creased portion 11 of the creased member 10.

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

  In this scribing unit, on the downstream side of a pair of upper and lower conveying rollers 30 for feeding the corrugated cardboard sheet A in the arrow direction, a pair of rotating shafts 31 and 32 rotating in opposite directions are vertically arranged. Attach the creased member 10 as a creased roll, attach the receiving roll 33 having a smooth surface without unevenness to the lower rotating shaft 32, and attach the corrugated sheet A fed between the folded member 10 and the receiving roll 33 It is subjected to a scoring process.

  As described above, also in the crease member 10 for scoring the corrugated cardboard sheet A as it is fed while the corrugated cardboard sheet A is rotated, the creased portion 11 is shaped as in the above embodiments, so that it is accurate. Sharp creases can be made in the position, and the defect rate of the manufactured cardboard box can be reduced.

A Corrugated cardboard sheet A ₁ blank L ruled line L ₁ vertical ruled line L ₂ horizontal ruled line S core paper W step 1 cutting plate 2 scoring plate 3 base 4 slit 10 creased member 11 creased portion 12 (12A, 12B) step 13 top ridge 14 side ridge 15 concave groove 16 cross groove 20 anvil roll 21 die roll 22 creased type 23 base 24 cutting edge 30 conveying roller 31, 32 rotating shaft 33 receiving roll

Claims (2)

A crease in which a plurality of stepped steps (12) having a convex shape as a whole of the creased portion (11) are formed on the surface of the creased portion (11) to insert creases for bending by pressing on a cardboard sheet In the member (10),
Top ridges (13) are formed between the step portions (12) located on the center of the creased portion (11) in the width direction center, and a plurality of side protrusions are formed on the surface of each step portion (12) The streaks (14) are formed side by side along the width direction so as to extend in the length direction of the creased portions (11), and between the top ridges (13) and the side ridges (14) and on adjacent sides Grooves (15) are formed between the ridges (14),
A creased member characterized in that the top ridges (13) project the largest in the pressing direction on the corrugated cardboard sheet as compared with the side ridges (14) of the step (12) on both sides.   2. The creased member according to claim 1, wherein two or more of the top ridges (13) are provided parallel to each other near the center in the width direction of the creased portion (11).

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