JP2012051229A - Corrugated board sheet, and method of processing to ruled line thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated board sheet which is easily and exactly folded along a ruled line when forming a box.SOLUTION: The ruled line 3 is formed by flatly crushing the prescribed portion of the corrugated board sheet A into a straight groove having U-shaped cross section from a back liner a3 to a top liner a2, a perforation-shaped fold line 4 is formed in a width-direction center portion of the ruled line 3 by piercing small holes 4a at a small interval in a longitudinal direction of the ruled line 3, the small holes 4a penetrating the back liner a3 and an intermediate a1 but not penetrating the top liner a2. When forming a box, corrugated board sheet portions A1, A2 on both sides of the ruled line 3 are easily and exactly folded along the fold line 4 while bending the top liner a2 side into a convex circular arc.

Description

  The present invention relates to a corrugated cardboard sheet that can be easily and accurately folded from a ruled line portion and a ruled line processing method thereof.

  The cardboard sheet is provided with ruled lines for forming the trunk of the cardboard box and cuts (slots) formed on both ends of the ruled lines, and the cardboard boxes are bent by sequentially folding the ruled lines at right angles. And forming the lid portion and the bottom portion of the cardboard box by sequentially folding the flaps formed between adjacent cuts. As described in Patent Document 1, ruled lines formed in grooves having a concave arc shape in cross section and ruled lines formed in grooves having a U-shaped cross section as described in Patent Document 2 are widely known. It has been.

  As shown in FIG. 13, the corrugated sheet processing machine processes a pair of upper and lower creaser rings 11A and 12A for processing a ruled line 3A (shown in FIGS. 14 and 16) and a cut (not shown) on the corrugated cardboard sheet A. And a pair of upper and lower slotter shafts 13A and 14A on which cutting blades 15A and 16A are mounted, and the outer peripheral surface of the upper creaser ring 11A is formed as a flat pressing surface that presses the cardboard sheet A in a plane. However, in the lower creaser ring 12A, the cross-sectional shape of the outer peripheral portion is formed in a convex arc shape or a rectangular shape.

Then, the corrugated sheet A is supplied to the corrugated sheet processing machine, and a predetermined portion of the back liner a3 of the corrugated cardboard sheet A is crushed toward the front liner a2 by the lower cleaver ring 12A to form a straight shape having a predetermined depth. After processing the ruled line 3A composed of grooves, a pair of upper and lower slotter shafts 13A
, 14A cutting edges 15A and 16A are used to cut the cuts.

JP 2001-328181 A JP 2002-67191 A

  However, in the former ruled line 3A, the cross section of which is formed in the shape of a straight groove having a concave arc shape, as shown in FIG. When the bent portion X is recessed so as to overlap the entire inner surface of the peak portion of the center core a1 formed in a continuous wave shape, the bent portion X is centered and the folded portion X Although the corrugated sheet portions A1 and A2 on both sides can be accurately folded so that the ruled line 3A having the curved portion X is on the inside, the position of the ruled line 3A processed by the creasering is not necessarily processed as described above. Rather, as shown in FIG. 14, most of the ruled lines have a bent portion X in the inclined portion between the peak portion and the valley portion of the center core a1, and the bent portion X of the bent portion X It is processed while being deformed into a concave groove shape integrally with the tip, or added so as to intersect between the inclined part and the peak part. It is.

  Therefore, the valley portion of the core a1 that is integrally bonded to the front liner a2 with respect to the bent portion X is provided at a position shifted to the one cardboard sheet portion A1 side. When the cardboard sheet portions A1 and A2 on both sides with the section X as the center are folded so that the bent portion X is on the inside, the cardboard sheet portions A1 and A2 on both sides can be folded evenly with the bent section X as the center. As shown in FIG. 15, the top of the front liner a2 bent into a convex arc shape is biased toward one corrugated sheet portion A1 as shown in FIG. There was a problem that a good cardboard box could not be manufactured.

  On the other hand, in the latter corrugated cardboard sheet A in which the ruled line 3A 'is formed by a straight groove having a U-shaped cross section, as shown in FIG. 16, the inner corners on both sides that are refracted at right angles to the bottom of the groove are bent. Since the portions X1 and X1 are formed, both side corrugated cardboard sheet portions A1 and A2 of the ruled line 3A 'can be easily bent from the bent portions X1 and X1, and thus the bent portions X1 and X1 are provided in two places. If this occurs, there may be a case where the force to bend from the bent portions X1 and X1 cannot be applied evenly, and as shown in FIG. 17, the liners on both sides of the corrugated cardboard sheet portions A1 and A2 are When they are combined, there is a problem that they cannot be accurately folded because they are shifted from each other in the surface direction.

  Also, when the bottom liner a3 of the corrugated cardboard sheet A is crushed into a U-shaped cross section toward the front liner a2 together with the center core a1 by the lower cleaver ring 12A, There is a possibility that a large tensile force acts on the portion extending to X1 and X1 and the back liner a3 portion is torn to reduce the strength of the cardboard box.

  The present invention has been made in view of such problems, and the object of the present invention is to be able to bend smoothly and accurately from a ruled line and to produce the next process without causing tearing of the back liner. It is an object of the present invention to provide a corrugated cardboard sheet and its ruled line processing method capable of reliably and efficiently producing a sheet.

  In order to achieve the above object, the corrugated cardboard sheet according to the present invention is a corrugated cardboard sheet in which a plurality of ruled lines and cut lines are processed at predetermined locations, as defined in claim 1, wherein the ruled lines are formed on the back liner of the corrugated cardboard sheet. A straight groove is formed by crushing a predetermined portion with a constant width and a constant depth together with the core, and a small hole is made to penetrate the front liner from the center in the width direction of the ruled line to the core. The crease is formed at the central portion in the width direction of the ruled line by making perforations at small intervals over the entire length of the ruled line.

  In the corrugated cardboard sheet configured as described above, the invention according to claim 2 is characterized in that the straight groove forming the ruled line is formed as a concave circular arc groove.

  The invention according to claim 3 is the corrugated sheet ruled line processing method described above, wherein the corrugated sheet is supplied to the ruled line processing part on the box making line, and a predetermined width and depth are given to predetermined portions on the back liner side of the corrugated sheet. When applying a ruled line consisting of a straight groove having a length of the ruled line, a number of small holes are not penetrated into the front liner at the center part in the width direction of the ruled line from the back liner to the center. A crease is formed by perforating at small intervals in the direction.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the ruled line processing portion is composed of a pair of upper and lower crease rings, and a predetermined portion on the back liner side of the corrugated cardboard sheet is crushed into a groove shape to give a ruled line. Perforation protrusions are provided in the center of the outer peripheral surface of the side crease ring at small intervals in the circumferential direction, and at the same time the ruled lines are formed by these perforations, a small hole for forming a crease at the center in the width direction of the ruled lines Is formed at every small interval in the length direction over the entire length of the ruled line.

  On the other hand, the invention according to claim 5 is arranged on the corrugated sheet supply side with respect to the ruled line processing portion, the crease forming roller having a perforation protrusion protruding at a small interval in the circumferential direction in the central portion of the outer peripheral surface, Before processing the ruled line by the ruled line processing part, a small hole is formed at every small interval over the entire length by the crease forming roller in the corrugated cardboard sheet portion corresponding to the center part in the width direction of the ruled line to form a crease. It is characterized by doing.

  Further, in the invention according to claim 6, a crease forming roller having a perforation protrusion projecting at a small interval in the circumferential direction at the central portion of the outer peripheral surface is disposed between the ruled line processing portion and the slotter processing portion. Then, after processing the ruled line on the corrugated cardboard sheet by the ruled line processing part, a small hole is formed at every small interval over the entire length by the crease forming roller at the center part in the width direction of the ruled line to form a crease. Features.

  The invention according to claim 7 is characterized in that in the inventions according to claims 3 to 6, a ruled line made of a straight groove having a concave arcuate cross section is processed.

  According to the invention of claim 1, the ruled line processed into the corrugated cardboard sheet is formed from a straight groove formed by crushing a predetermined portion of the back liner of the corrugated cardboard sheet with a constant width and a predetermined depth together with the center core. The width direction of the ruled line is perforated at small intervals over the entire length of the ruled line without penetrating a small hole from the center to the center of the ruled line in the width direction. Since the crease is formed in the center of the crease, the perforated crease is formed even if the ruled line is crushed and formed from the back liner to the inclined surface portion between the peak and valley of the core. The corrugated sheet portions on both sides, which are provided with the large number of small holes as weak portions and sandwiching the ruled line, are smoothly and accurately applied with equal bending force from the perforated folds at the center of the ruled line. Can be folded.

  At this time, since the front liner of the corrugated cardboard sheet is not provided with perforations, there is no possibility of damaging the appearance, and the front liner can be easily and accurately folded so as to overlap the crease. In addition, when the cardboard sheet portions on both sides adjacent to each other through the ruled line are bent from the ruled line, bending stress concentrates on the perforated fold provided in the center in the width direction of the ruled line, so There is almost no tensile force acting on the corrugated cardboard portion, and therefore, if the corrugated sheet is processed by supplying the corrugated cardboard sheet processing such a ruled line to an automatic iron making machine, the ruled line portion is not damaged. The sheet portions on both sides sandwiching the ruled line can be bent accurately, and a highly accurate cardboard box can be efficiently manufactured.

  Furthermore, according to the invention according to claim 2, since the straight groove forming the ruled line is formed in a U-shaped cross section, the back liner forming the ruled line is not broken. Even if the depth of the groove forming the ruled line is shallow, it can be easily and accurately folded from the perforated fold.

  Further, the invention according to claim 3 is the method for processing a ruled line of the cardboard sheet, wherein the cardboard sheet is supplied to a ruled line processing part on the box making line, and a predetermined width is provided at a predetermined position on the back liner side of the cardboard sheet. When applying a ruled line composed of a straight groove having a depth, along this ruled line, a large number of small holes are ruled into the part from the back liner to the center of the center of the ruled line in the width direction without penetrating the front liner. Since the crease is formed by perforating at small intervals in the length direction, it can be folded easily and accurately from the crease without tearing the back liner etc. A ruled line capable of producing a corrugated cardboard bag exhibiting a good appearance can be processed.

  In such a corrugated sheet crease processing method, the invention according to claim 4 is characterized in that a perforation projection is provided at small intervals in the circumferential direction at the center of the outer peripheral surface of the lower creaser ring in the pair of upper and lower creasers for performing crease processing. Since it is projecting, a groove-like ruled line is processed at a predetermined position of the back liner of the corrugated cardboard sheet by this lower cleaver ring, and at the same time, a small hole for forming a crease is formed by the above-mentioned perforated hole projection at the center part in the width direction Can be accurately formed in a perforated shape over the entire length.

  On the other hand, according to the fifth aspect of the present invention, the crease forming roller having the perforation protrusions protruding from the central portion of the outer peripheral surface at small intervals in the circumferential direction is disposed on the corrugated sheet supply side with respect to the ruled line processing portion. Therefore, before processing the ruled line by the ruled line processing unit, a small hole is formed at every small interval over the entire length by the crease forming roller in the corrugated cardboard sheet portion corresponding to the center part in the width direction of the ruled line. According to the invention according to claim 6, the crease forming roller in which the perforation protrusions are projected at small intervals in the circumferential direction at the central portion of the outer peripheral surface is provided with the ruled line processing portion and the slotter. Since it is arranged between the processing section, the ruled line processing section processes the ruled line on the corrugated cardboard sheet, and then the crease forming roller forms a small hole over the entire length in the center in the width direction of the ruled line. Make a crease by drilling every time In any of the ruled line processing methods, an existing corrugated sheet processing machine is used to incorporate a crease forming roller into the processing machine, so that the sewing machine can be used without damaging the table liner at the center in the width direction of the ruled line. A corrugated cardboard sheet formed with a grid-like crease can be processed.

  Further, according to the invention of claim 7, since the perforation-like crease is processed in the central portion in the width direction of the ruled line made of a straight groove having a U-shaped cross section, the back liner portion forming the ruled line is torn, etc. The perforated folds can be machined easily and accurately without causing creases, and even if the groove forming the ruled line is shallow, it can be easily and accurately folded from the perforated folds. A corrugated cardboard sheet that can be provided can be provided.

The simplified perspective view of a cardboard sheet. The enlarged vertical front view of a ruled line part. The plan view. The enlarged vertical front view which shows the state bent from the ruled line. The simplified side view of the cardboard sheet processing machine. The enlarged front view of the up-and-down creaser ring which processed the ruled line. The simplified side view which shows another embodiment of the processing machine of a corrugated cardboard sheet. The expanded vertical front view which shows the state which is processing the ruled line of a shallow bottom. The enlarged vertical front view which shows the state which is processing the ruled line of predetermined depth. The simplified side view which shows another embodiment of the processing machine of a corrugated cardboard sheet. The enlarged front view of the up-and-down creaser ring which processed the ruled line. The enlarged front view of the roller for up-down fold formation of the state which is processing the fold. The simplified side view of the conventional corrugated cardboard sheet processing machine. The longitudinal section front view of the conventional corrugated cardboard sheet by which the ruled line process was carried out. The longitudinal section front view of the state bent. The longitudinal cross-sectional front view of the conventional cardboard sheet | seat which processed the ruled line of U-shaped cross section. The longitudinal section front view of the state bent.

  The embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, a corrugated cardboard sheet A is a double-faced cardboard sheet in which front and back liners a2 and a3 are bonded to both surfaces of a corrugated core a1. The flat corrugated sheet A is formed in a plane horizontally long rectangular shape with a space equal to the height of the trunk of the corrugated cardboard case when it is made by a iron making machine. Two straight bent portions 1 and 2 parallel to the long side edge are formed between both ends on the short side, and both ends are between the straight bent portions 1 and 2. The ruled lines 3, 3, and 3 reaching the straight bent portions 1 and 2, respectively, are formed for each width interval of the peripheral wall portions in the four-side peripheral wall portion that forms the trunk portion of the cardboard case.

  These ruled lines 3, 3, and 3 are crushed together with the core a1 toward the front liner a2 with a predetermined width and a predetermined depth on the back liner a3 of the corrugated cardboard sheet A toward the front liner a2. The groove bottom is formed at the center of each ruled line 3 in the width direction, that is, at the groove bottom of the straight groove forming the ruled line 3. A large number of small holes 4a penetrating the back liner portion and the core portion are formed at intervals of 1 cm to 1.5 cm in the length direction of the straight groove to form perforated folds 4. Yes. The shape of the small hole 4a may be circular or quadrangular, and is not particularly limited.

  Further, since the core a1 is formed in a wave shape, when the ruled line 3 is formed by crushing a predetermined portion of the back liner a3 into a straight groove having a U-shaped cross section, the core a1 has a U-shaped cross section. It is deformed into a saddle shape without being deformed into a shape, and the shape of the saddle shape is not uniform on both sides with respect to the center in the width direction of the ruled line 3, but a small hole 4a formed in the back liner a3. The small hole 4a formed in the center core a1 so as to overlap the small hole 4a is provided on a line perpendicular to the surfaces of the front and back liners a2 and a3. Note that the small hole 4a provided in the center core a1 does not necessarily pass through the center core a1, and may be formed to the middle of the thickness of the center core a1.

  Corresponding to the sheet portion between one edge on the long side of the cardboard sheet A and the linear bent portion 1 corresponding to the one edge, the other edge on the long side of the cardboard sheet A and the other edge A cut portion (slot) 5, 5, 5 is provided in the extending direction of each of the ruled lines 3, 3, 3, and one end of the cardboard sheet A. The sheet portions on the side and the other side are divided into four lid forming flaps 6 and four bottom forming flaps 7 by these cut lines 5, 5, and 5, respectively. Reference numeral 8 denotes a paste margin piece formed in a protruding state on one edge of the corrugated cardboard sheet A.

  When producing a corrugated cardboard box in which the corrugated cardboard sheet A constructed as described above is folded by a iron making machine or the like, the corrugated cardboard sheet portions A1, A2 sandwiching the ruled line 3 from the ruled line 3 formed of a straight groove having a U-shaped section. Are folded so that the back liners a3 and a3 of the both side corrugated cardboard sheet portions A1 and A2 are overlapped as shown in FIG. The surface liner portion corresponding to the ruled line 3 is formed in a convex arc shape from the perforated fold line 4 formed of a large number of small holes 4a provided at small intervals over the entire length of the ruled line 3 in the center. The side corrugated sheet portions A1 and A2 are bent while being bent, and the back liners a3 and a3 are joined to each other without being displaced in the length direction of the corrugated cardboard sheet A.

  Next, the processing machine 10 for manufacturing the corrugated cardboard sheet A provided with the ruled lines 3 and the cut lines 4 will be described. The processing machine 10 processes the ruled lines 3 on the corrugated cardboard sheet A as shown in FIG. A pair of upper and lower creaser rings 11 and 12, an upper slotter shaft 13 on which cutting blades 15 and 16 for machining the cut 4 are mounted, and a lower slotter shaft 14 disposed below the upper slotter shaft 13 are provided. Yes.

  In the pair of upper and lower creaser rings 11 and 12, the outer peripheral surface of the upper creaser ring 11 is formed on a flat pressing surface 11a that presses the surface liner a2 of the cardboard sheet A in a plane as shown in FIG. However, the lower creaser ring 12 is formed on the outer peripheral surface of the pressing outer peripheral surface 12a curved in a convex arc shape for processing the ruled line 3, and at the center of the curved pressing outer peripheral surface 12a, that is, Further, a perforation projection 17 is formed on the top portion, which is composed of a pin whose tip is formed at a sharp end at regular intervals of about 1 to 1.5 cm in the circumferential direction. The length of the projection 17 for drilling, that is, the projection height is determined by the ruled line 3 formed of a straight groove having a U-shaped cross section by crushing a predetermined portion of the back liner a3 by the curved pressing outer peripheral surface 12a of the lower cleaver ring 12. Is formed in such a length dimension that it penetrates the inner bottom surface of the groove of the ruled line 3 and the tip of the groove reaches the inner surface of the front liner a2 or the vicinity of the inner surface.

  The upper and lower pair of creaser rings 11 and 12 are attached to a plurality of pairs of ruled line machining positions on the upper and lower creaser shafts 21 and 22 with predetermined intervals, respectively. Similarly, the upper and lower slotter shafts 13 and 14 are attached. Also, a plurality of pairs of cutting blades 15 and 16 attached to the upper and lower pair of creaser rings 11 and 12 are arranged corresponding to the upper creaser rings 11 in the pair. Although not shown, a cutting blade for forming the adhesive margin piece 8 at the other end of the corrugated cardboard sheet A is provided at the end of the upper slock shaft 13.

  When the cardboard sheet A before processing is inserted between the upper and lower creaser shafts 21 and 22 with the edge of one long side thereof directed in the supply direction on the cardboard sheet processing machine configured as described above, The upper and lower creaser rings 11 and 12 are sandwiched between the pressing surface 11a of the upper creaser ring 11 and the pressing outer peripheral surface 12a of the lower creaser ring 12, and are pressed by the pressing surface 11a of the upper creaser ring 11. As shown in FIG. 6, with the front liner a2 of the corrugated cardboard sheet A being received, the back liner a3 of the corrugated cardboard sheet A is placed on the front liner a2 side by the convex arcuate outer peripheral surface 12a of the lower cleaver ring 12 The ruled line 3 made of a straight groove recessed in a U-shaped cross section is processed on the back liner a3 side.

  The depth of the straight groove, that is, the ruled line 3, is set by the distance between the opposing outer peripheral surfaces of the upper and lower creaser rings 11 and 12, and is a depth that does not hinder the folding of the cardboard sheet A from the ruled line 3. That is all you need.

  The processing of the ruled line 3 by the upper and lower creaser rings 11 and 12 is performed by press-fitting the convex arcuate outer peripheral surface 12a of the lower creaser ring 12 to the back liner a3 of the cardboard sheet A as described above. The center core a1 interposed between the opposing surfaces of the front and back liners a2 and a3 is deformed into a bowl shape with the portion that is crushed integrally with the back liner a3 and bonded to the opposing surfaces of the front and back liners a2 and a3 as a fulcrum To do.

  Further, simultaneously with the processing of the ruled line 3, the center part in the width direction of the ruled line 3 in which the perforation projection 17 projecting at the center part of the pressing outer peripheral surface 12a of the lower crease ring 12 is processed into a U-shaped cross section. Small holes 4a and 4a that vertically penetrate the back liner portion and the core portion on the axis in the thickness direction of the corrugated cardboard sheet A through the core portion from the back liner portion. 17 is provided with a plurality of protrusions at regular intervals in the circumferential direction of the pressing outer peripheral surface 12a of the lower creaser ring 12, so that the small holes 4a are formed in the lower creaser ring 12 as the upper and lower creaser rings 11 and 12 rotate. A perforation-like crease 4 is formed in the central portion in the width direction of the ruled line 3 made of a straight groove having a U-shaped cross section processed by the pressing outer peripheral surface 12a at small intervals in the length direction. .

  The fold line 4 composed of a large number of small holes 4a is provided over the entire length in the center in the width direction of all the ruled lines 3. Thus, after the ruled line 3 having the crease 4 in the center in the width direction is processed on the corrugated cardboard sheet A by the upper and lower crease rings 11 and 12, the corrugated cardboard sheet A is continuously supplied between the upper and lower slotter shafts 13 and 14 to the upper side. The cut edges 15 and 16 attached to the slotter shaft 13 are used to process the cuts 5 in the extending direction of the both ends of each ruled line 3 and the paste margin piece 8.

  In this corrugated sheet processing machine 10, a perforation protrusion 17 is provided on the outer peripheral surface 12 a of the lower creaser ring 12 for processing the ruled line 3, and at the same time as the ruled line 3 is processed, the central part of the ruled line 3 in the width direction. However, the crease 4 may be formed by a pair of upper and lower crease forming rollers 31 and 32 that are separate from the upper and lower crease rings 11 and 12. Good.

  FIG. 7 shows the corrugated cardboard processing machine. The processing machine 10A includes a pair of upper and lower creaser rings 11 and 12 for processing the ruled line 3 on the corrugated cardboard sheet A, and cutting blades 15 and 16 for processing the cut line 4. In a known corrugated cardboard sheet processing machine provided with a mounted upper slotter shaft 13 and a lower slotter shaft 14 disposed below the upper slotter shaft 13, a pair of upper and lower creaser rings 11, 12 which are ruled line processing portions On the other hand, the pair of upper and lower crease forming rollers 31 and 32 are arranged on the cardboard sheet supply side, that is, the upstream side.

  These upper and lower crease forming rollers 31 and 32 correspond to the ruled line processing positions on the corrugated cardboard sheet A, respectively, on the vertical rotation center shafts 33 and 34, respectively, at predetermined intervals in the length direction of the rotation center shafts 33 and 34 It is installed. Further, as shown in FIG. 8, the outer peripheral surface of the upper crease forming roller 31 is a flat pressing surface 31a for receiving the front liner a2 of the corrugated cardboard sheet A in the same manner as the upper creaser ring 11 in the ruled line processing section. The outer peripheral surface of the lower crease forming roller 32 is formed in a convex arc shape in cross section, similar to the pressing outer peripheral surface 12a curved in a convex arc shape in cross section of the lower creaser ring 12 in the ruled line processing portion. A curved pressing outer peripheral surface 32a is formed.

  The pressing outer peripheral surface 32a of the lower crease forming roller 32 is formed in advance in the groove depth of the crease line 3 before the crease line 3 is processed on the back liner a3 of the cardboard sheet A by the lower crease ring 12 of the crease forming part. It is provided for crushing and processing the ruled line 3a of the straight groove shallower than the thickness, and the tip is provided at regular intervals of about 1 to 1.5 cm in the circumferential direction at the central portion of the pressing outer peripheral surface 32a, that is, the top portion. A perforation projection 17 made of a pin formed at a sharp end is provided. As described above, the length of the projection 17 for drilling, that is, the projection height is determined by crushing a predetermined portion of the back liner a3 with the curved pressing outer peripheral surface 32a, and the ruled line 3a formed of a straight groove having a U-shaped cross section. Is formed to have a length dimension that penetrates the inner bottom surface of the groove of the ruled line 3a and that the tip of the groove reaches the inner surface of the front liner a2 or the vicinity of the inner surface.

  The unprocessed cardboard sheet A is fed between the pair of upper and lower crease forming rollers 31 and 32 with the one long side edge directed in the supply direction. As shown in FIG. 8, the ruled line processed portion of the corrugated cardboard sheet A is clamped by these crease forming rollers 31 and 32, and the press liner 31a of the upper crease forming roller 31 is used as the front liner of the corrugated cardboard sheet A. The back liner a3 of the corrugated cardboard sheet A is crushed toward the front liner a2 side by the convex arc-shaped pressing outer peripheral surface 32a of the lower crease forming roller 32 in a state where a2 is received, and has a U-shaped cross section. A ruled line 3a made of a recessed shallow straight groove is processed.

  Further, simultaneously with the processing of the ruled line 3a, the perforation protrusion 17 projecting from the central portion of the pressing outer peripheral surface 32a of the lower crease forming roller 32 is centered from the back liner portion of the central portion in the width direction of the ruled line 3a. Small holes 4a and 4a are formed in the back liner portion and the middle core portion so as to vertically overlap each other on the axis in the thickness direction of the corrugated cardboard sheet A through the core portion, and the punching projection 17 forms a lower fold. Since a large number of protrusions are provided at regular intervals in the circumferential direction of the pressing outer peripheral surface 32a of the roller 32, the small hole 4a is formed in the center in the width direction of the ruled line 3a as the upper and lower fold forming rollers 31 and 32 rotate. Perforated folds 4 are formed by drilling in the portion at small intervals in the length direction.

  The crease 4 composed of a large number of small holes 4a is provided over the entire length in the center in the width direction of all the ruled lines 3a. Thus, after the ruled line 3a having the crease 4 at the center in the width direction is processed on the corrugated cardboard sheet A by the upper and lower crease forming rollers 31, 32, the corrugated cardboard sheet A is continuously fed to the upper and lower creaser rings 11, 12. 9, with the pressing surface 11 a of the upper creaser ring 11 receiving the front liner a 2 of the corrugated cardboard sheet A, the lower creaser 12 has a convex arc-shaped pressing outer peripheral surface 12 a to The ruled line 3a having a predetermined depth is processed by further pressing the shallow ruled line 3a processed by the pressing outer peripheral surface 32a of the side fold forming roller 32.

  Thus, after forming the perforated crease 4 together with the shallow ruled line 3a by the lower crease forming roller 32 in the pair of upper and lower crease forming rollers 31, 32, a pair of upper and lower crease rings 11, The lower crease ring 12 at 12 is further pressed into the ruled line 3 having a predetermined depth by further pressing the shallow ruled line 3a, so that the crease 4 is held at a predetermined ruled line folding position without being displaced, and The ruled line 3 can be processed without causing the back liner a3 of the ruled line portion to break due to abrupt pulling during the ruled line processing. Following this ruled line processing, each of the above ruled lines is cut by the cutting blades 15 and 16 that are continuously fed between the upper and lower slotter shafts 13 and 14 and mounted on the upper slotter shaft 13 in the same manner as described above. 3, the cut line 4 is processed in the direction in which both ends are extended, and the adhesive margin piece 8 is processed.

  In this embodiment, before the ruled line 3 having a predetermined depth is processed by the pair of upper and lower crease rings 11 and 12, the crease 4 is simultaneously processed by the pair of upper and lower crease forming rollers 31 and 32 and the shallow ruled line 3a. However, after the ruled line 3 having a predetermined depth is processed by the pair of upper and lower crease rings 11 and 12, the crease 4 may be formed by the pair of upper and lower crease forming rollers 31 'and 32'.

  FIG. 10 shows an embodiment thereof. This corrugated cardboard processing machine 10B includes a pair of upper and lower creaser rings 11 and 12 for processing the ruled line 3 on the corrugated cardboard sheet A, and a cutting blade 15 for processing the cut line 4. In a known corrugated cardboard sheet processing machine having an upper slotter shaft 13 to which 16 is mounted and a lower slotter shaft 14 disposed below the upper slotter shaft 13, a pair of upper and lower creaser rings 11 which are ruled line processing portions The pair of upper and lower crease forming rollers 31 ′ and 32 ′ are disposed downstream of the pair of upper and lower creaser rings 11 and 12 and the upper and lower slotter shafts 13 and 14.

  The upper fold forming roller 31 ′ of the pair of upper and lower fold forming rollers 31 ′ and 32 ′ is formed in the same shape as the upper fold forming roller 31 in the above embodiment, and the lower fold forming roller 31 ′ The forming roller 32 ′ is formed in the same shape and structure as the lower crease forming roller 32 in the above embodiment except that the ruled line pressing depth by the pressing outer peripheral surface 32a ′ is different. That is, the pressing outer peripheral surface 32a ′ of the lower crease forming roller 32 ′ has the same shape as the pressing outer peripheral surface 12a of the lower creaser ring 12 for processing the ruled line 3, or the pressing outer peripheral surface 12a is more than the ruled line processing depth. It is formed in a shape and a structure that presses the ruled line 3 slightly deeply, and is about 1 to 1.5 cm in the circumferential direction at the center, that is, the top of the pressing outer peripheral surface 32a ′ of the lower fold forming roller 32 ′. Protrusions 17 for drilling, each consisting of a pin whose tip is formed at a sharp end, are provided at regular intervals. As described above, the length of the protrusion 17 for punching, that is, the protruding height is a length dimension that penetrates the inner bottom surface of the ruled line 3 to be processed and reaches the tip of the inner surface of the front liner a2 or the vicinity of the inner surface. Is formed.

  When the unprocessed cardboard sheet A is inserted between the upper and lower creaser shafts 21 and 22 with the edge on one long side thereof directed in the supply direction, into the corrugated sheet processing machine 10B configured as described above, FIG. As shown in Fig. 2, the lower creaser ring is placed with the front liner a2 of the corrugated cardboard sheet A being received by the pressing surface 11a of the upper creaser ring 11 in the upper and lower creaser rings 11 and 12 arranged at the ruled line processing position. The back liner a3 of the corrugated cardboard sheet A is crushed toward the front liner a2 side by twelve convex arc-shaped pressing outer peripheral surfaces 12a, and the back liner a3 side is formed by a straight groove recessed into a U-shaped cross section by the crushing. The ruled line 3 is processed.

  Subsequently, when the corrugated cardboard sheet A is supplied between the upper and lower creaser rings 11 and 12 between the crease forming rollers 31 'and 32', as shown in FIG. 12, the ruled line processed portion of the corrugated cardboard sheet A forms these creases. For forming the lower crease with the front liner a2 of the corrugated cardboard sheet A being received by the flat pressing surface 31a 'of the upper fold forming roller 31'. The convex arcuate outer peripheral surface 32a 'of the roller 32' is fitted into the ruled line 3 processed by the lower crease ring 12, and the ruled line 3 is pressed against the ruled line 3 by the pressed outer peripheral surface 32a '. A perforation protrusion 17 projecting from the center of the pressing outer peripheral surface 32a 'passes through the center from the back liner at the center in the width direction of the ruled line 3, and extends into the back liner and center. Small overlapping on top and bottom on the axis of the cardboard sheet A in the thickness direction Holes 4a and 4a are formed, and small holes 4a and 4a are formed in the central portion in the width direction of the ruled line 3 at small intervals in the length direction as the upper and lower fold forming rollers 31 'and 32' rotate. Thus, a perforated fold line 4 is formed.

  Subsequent to the processing of the crease 4, the cardboard sheet A is continuously fed between the upper and lower slotter shafts 13 and 14, and the ruled lines 3 are cut by the cutting blades 15 and 16 attached to the upper slotter shaft 13. The cut 5 is processed in the both ends extending direction, and the glue margin piece 8 is processed. In the above embodiment, the double-sided cardboard has been described, but the present invention can of course be applied to a double-sided cardboard and a tri-wall cardboard.

A Cardboard sheet
a1 center core
a2 Table liner
a3 Back liner 3 Ruled line 4 Crease
4a small hole
10 Processing machine
11, 12 Top and bottom creaser ring
11a Pushing surface
12a Pressing outer peripheral surface
17 Drilling protrusion
31, 32 Folding rollers

Claims (7)

In a corrugated cardboard sheet in which a plurality of ruled lines and cuts are processed at a predetermined location, the ruled line is a straight groove formed by crushing a predetermined location on the back liner of the corrugated cardboard sheet with a constant width and a predetermined depth together with the core. The perforation of the ruled line is made by perforating at small intervals over the entire length of the ruled line without penetrating the small hole from the center part in the width direction of the ruled line to the center of the surface liner. A corrugated cardboard sheet characterized in that a crease is formed at the center in the width direction.   The corrugated cardboard sheet according to claim 1, wherein the straight groove forming the ruled line is formed into a groove having a concave arc shape in cross section.   When supplying a cardboard sheet to a ruled line processing portion on the box making line and applying a ruled line made of a straight groove having a certain width and depth at a predetermined position on the back liner side of the cardboard sheet, the ruled line and the ruled line A number of small holes are perforated in the length direction of the ruled line in the length direction of the ruled line in the central part of the width direction from the back liner to the center without penetrating the front liner to form creases. A ruled line processing method for a corrugated cardboard sheet.   The ruled line processing section consists of a pair of upper and lower creaser rings, and for drilling at small intervals in the circumferential direction at the center of the outer peripheral surface of the lower creaser ring that crushes predetermined locations on the back liner side of the cardboard sheet into a groove shape Protrusions are provided, and with this perforation protrusion, a crease-forming small hole is formed in the center of the ruled line in the width direction at the same time along the length of the ruled line at every small interval. The ruled line processing method for corrugated cardboard sheets according to claim 3.   Before processing the ruled line by the ruled line processing unit, a crease forming roller having a perforation projection protruding in the circumferential direction at the center of the outer peripheral surface is provided on the corrugated sheet supply side with respect to the ruled line processing unit. 4. A crease is formed by punching a small hole at every small interval over the entire length by the crease forming roller in the corrugated sheet portion corresponding to the central portion of the ruled line in the width direction. The ruled line processing method of the corrugated cardboard sheet described.   A crease-forming roller is provided between the crease processing section and the slotter processing section, and a crease forming roller having a perforation protrusion projecting at a small interval in the circumferential direction at the center of the outer peripheral surface. 3. The crease is formed by drilling a small hole at every small interval over the entire length by the crease forming roller in the center portion in the width direction of the ruled line. A ruled line processing method for cardboard sheets.   The ruled line processing method for a corrugated cardboard sheet according to any one of claims 3 to 6, wherein a ruled line made of a straight groove having a concave arcuate cross section is processed.

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