JP2017213753A - Punching method for providing elongation allowance part and making width of interval between two crease ruled lines equal to interval of corrugation top pitch of double-sided cardboard sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching method in which a second longitudinal folding crease ruled line and a fourth longitudinal folding crease ruled line of a double-sided cardboard sheet box can accurately be folded at 180 degrees, regardless of the punching method of the back side punching and the front side punching, and thereby the box bonding failure such as fish tail and second buckling can be prevented.SOLUTION: In the back side punching, second and fourth longitudinal folding press ruling members are formed by first and second press ruling members, respectively. A face plate 5 for forming an elongation allowance part 23 is provided at the position opposed to the middle of the first and second press ruling members 41, 42. An interval size 43 viewing from the center of the first and second press ruling members is made into the interval equal to the interval of a corrugation top pitch 26. In the front side punching, the second and fourth longitudinal folding press ruling members are formed by a left press ruling member 441 and a right press ruling member 442 respectively, and a press ruling member group 44 comprising a central press ruling member 443 for forming the elongation allowance part. The face plate with a recessed groove strip is provided at the position opposed to the press ruling member group, and the width of the recessed groove strip 55 is made into the interval equal to the interval of the corrugation top pitch.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method of punching a double-sided corrugated cardboard sheet 21 using a Thomson mold 1 to obtain a blank sheet 22, and in particular, a second longitudinal fold in a parallel direction along the step provided on the blank sheet 22 with a gluer. The crease ruled line 31 and the fourth vertically folded crease ruled line 32 are folded 180 degrees inward and pasted and pasted to create a box. The present invention relates to a blanking method of a blank sheet 22 that increases bending accuracy.

Background art of manufacturing a package using a corrugated cardboard sheet such as a corrugated cardboard packaging box includes a corrugating process, box making, a punching process, and a gluer process.

In the corrugating process, a core base paper is formed into a corrugated shape with a single facer, and after applying an adhesive on the top, it is bonded to the back liner to make a single-sided corrugated cardboard. The single-sided corrugated cardboard coated with the adhesive is glued by a double facer with a glue machine and the front liner is completed, the corrugated cardboard sheet is completed, transported to the cut-off, and cut to produce the corrugated cardboard sheet.

Corrugated cardboard sheets manufactured by corrugating include double-sided cardboard sheets, which are manufactured according to the standards shown in Table 1 below.

According to the specifications for the double-sided corrugated cardboard sheet shown in Table 1, in the B flute and E flute, the corrugated pitch and the thickness when the sheets are folded 180 degrees are equal to 6.0 mm and 3.2 mm. But,
In the A flute, the stepped pitch is 8.8 mm, the thickness when the sheet is folded 180 degrees is 10 mm, and there is a difference of 1.2 mm.
In the C flute, the stepped pitch is 7.5 mm, the thickness when the sheet is folded 180 degrees is 8.0 mm, and there is a difference of 0.5 mm.

As a Thomson type corrugated sheet punching method in a box making and punching process, there are a back-cutting method and a front punching method, and a flat die cutter and a rotary die cutter are used.

The flat die cutter is used in the back-cutting method and the front-cutting method. It is a flat contact type punching process in which the cutting plate of the punching machine is moved up and down with respect to the flat plate-shaped Thomson mold to perform punching and crease cutting. is there.

The flat die cutter is capable of operating at a speed of 60 to 100 sheets per minute, and has a structure in which the corrugated cardboard sheet is processed while being punched and creased.

The rotary die cutter is generally used in the back-cutting method, and both rolls are rotated by a semi-circular Thomson type attached to the upper anvil roll and the lower die cylinder roll, and the corrugated cardboard sheet is moved in the direction of the step. This is a curved surface contact type punching process in which punching and crease forming are performed while feeding.

The rotary die cutter has a structure that can perform a very fast operation speed of processing about 200 sheets per minute, and moves and processes the corrugated cardboard sheet without stopping when punching and ruled.

The flat contact type flat die cutter has a crease that flatly compresses the cardboard sheet with a crease member, while the curved contact type rotary die cutter has a crease that moves forward while pinching the cardboard sheet with the crease member. These are different contact types.

For example, when punching and crease the A flute corrugated cardboard sheet having a sheet thickness of 5 mm using a rotary die cutter, the A flute corrugated cardboard sheet is instantly about 0.8 mm from a thickness of 5 mm. Therefore, the back liner is damaged when a load exceeding the tensile strength and bursting strength of the paper of the back liner is applied.

Even in flat contact type flat die cutters, for example, when a double-sided corrugated sheet is processed with a Thomson type, the corrugated mountain of the double-sided corrugated cardboard sheet is instantaneously compressed, and if the load is heavy, the back liner of the blank sheet will crack Damage may occur.

In view of the above, various measures such as ruled members and auxiliary compression members have been developed as countermeasures.
If the Thomson type or face plate is set without considering the difference in contact type such as flat contact type flat die cutter and curved surface type rotary die cutter, there is a high possibility of damaging the cardboard sheet. It can be said.

The standard height of the Thomson-type blade used for punching corrugated cardboard sheets with a flat die cutter is 23.6 mm as a standard because of the structure of the punching machine.
For the height, width and tip shape of the ruled member, the height of the ruled member is the height obtained by subtracting the crushed thickness of the cardboard sheet to be punched from the height of the blade,
The width of the ruled member is generally from 0.7 mm to 3.0 mm because of the ease of shearing of the ruled member at the time of manufacturing the Thomson type, and 2 when a width of 3 mm or more is required. Use a book ruler to deal with it. The tip shape of the ruled member includes a round shape, a U shape, a square shape, a V shape, and the like.
The thickness of the face plate and the width of the groove is determined based on the thickness of the crushed cardboard sheet to be punched, and the width of the groove is determined by the width of the ruled line and the corrugated sheet to be punched. Determine based on twice the crushed thickness.

As a punching method for punching a corrugated cardboard sheet with a Thomson type, there are a back-cutting method and a front-cutting method.
The back-cutting method is a processing method in which a corrugated cardboard sheet is pressed from the back side of the double-sided corrugated cardboard sheet with a Thomson-type ruled member, and a crease ruled line is formed. Fold in a way
The front-cutting method is a processing method in which a crease ruled line is formed by pressing from the surface side of a paperboard or a part of a decorative cardboard sheet with a face plate provided with a Thomson-type ruled member and a concave groove on the cutting plate. In this method, the crease ruled line is folded to the side of the groove with the width of the edge of the groove on the face plate.

From the above, the crease ruled line formed on the blanked sheet was changed to the front liner side or the back liner side, and the width of the crease ruled line and the direction of folding differed between the reverse punching method and the front punching method. It becomes a property. That is, in the punching method, the back punching method and the front punching method are important items.

The gluer process is a process in which a blank sheet is glued with gluer to form a box.

Japanese Patent No. 3486262 JP 2010-284866 A Japanese Patent No. 5894343 JP 2001-252993 A Japanese Patent No. 3460760 Japanese Patent Laid-Open No. 11-34185 Japanese Patent No. 3210870 Japanese Patent No. 5886460 Japanese Patent Laid-Open No. 55-77550 JP 2010-284865 A JP-A-11-10754 JP-A-10-286893 Japanese Patent Laid-Open No. 10-249958 Utility Model Registration No. 3041886 Utility Model Registration No. 3042309 JP-A-10-278133 Japanese Patent Laid-Open No. 10-286892 JP 2000-85032 A

Prior art studies were conducted on the prior art documents as conventional techniques.
The contents of the prior art search are described below.
In the description of the contents of the prior art search below, the terms, symbols, and figures used in each prior art document are cited as they are.
In particular, with respect to the reference numerals and drawings, it is necessary to thoroughly refer to the prior art documents in order to prevent confusion with the reference numerals and drawings of the present invention.

The contents of the prior art search conducted on Patent Document 1 are described below.
In the description, the terms, symbols, and figures used in Patent Document 1 are cited as they are.
In particular, with respect to the reference numerals and drawings, thorough reference to Patent Document 1 is required to prevent confusion with the reference numerals and drawings of the present invention.

Patent Document 1 is an application related to a ruled groove forming body.

In “Claims” of Patent Document 1, there is no description as to whether the back-cutting method or the front-cutting method is an important item in the punching process.

In the back-cutting method and the front-cutting method, the streaks formed on the blank sheet that has been punched are changed to the front liner side or the back liner side, and the width of the streaks and the folding direction are different. In the punching process, the back punching method and the front punching method are important items.

However, as indicated above, the “claim” of Patent Document 1 does not describe whether it is a back-cutting method or a front-cutting method, but “0019” Two streaks 22 and 23 on the back surface (inner surface) side of the corrugated cardboard sheet 20 by the protrusions 16 and the ruled grooves 6 of the ruled line 12 and by the protrusions 17 and the ruled grooves 7 (FIG. 4 ( a) is formed respectively. Further, on the surface side of the corrugated cardboard sheet 20, concave portions 24 and 25 are formed on both sides of the streaks 21. ], It is estimated that Patent Document 1 is a back-cutting process.

In Patent Document 1, which is a backside-cutting process based on the above estimation, a blank sheet provided with the streaks 21 provided on the front liner side provided in the vicinity and the streaks 22 and 23 provided on the back liner side is provided. When you start to fold to the back liner side,
Considering the fulcrum at which the crease ruled line breaks, it should begin to fold from either the streak 22 or the streak 23 when bent by a gluer.
However, the description of “0020” of Patent Document 1 “When the corrugated cardboard sheet 20 in which the streaks 21, 22, and 23 are formed in this way is folded with the streaks 21 on the outside, it is shown in FIG. As shown in the figure, first, folding starts with the outer streaks 21 as the folding center line, and then folding is performed with the concave portions 24, 25 on both sides as folding lines. As described in Japanese Patent Application Laid-Open No. 2003-228688, it is first described that the structure begins to bend with the outer streaks 21 as the folding center line.

Patent Document 1 does not have a structure that starts to bend from either the streak line 22 or the streak line 23 at the time of the original folding in the back-cutting process, and as described above, the outer streak line 21 is first bent as the folding center line. If the structure starts, the ruled line torque of the streaks 21 is very low, and it can be said that the streaks 22 and 23 are formed as very high ruled line torques.
The present invention is not a structure in which folding starts with the outer streaks 21 as the folding center line as in Patent Document 1, but is an invention having a structure different from that of Patent Document 1, and the present invention is novel. .

Further, as a method of changing the degree of crushing of the streaks 21 in Patent Document 1, “0017” of “0017” of Patent Document 1 “By changing the width and height of the third ruled line portion 12 c as appropriate, The depth of the groove portion 18 can be appropriately adjusted according to the material, thickness, etc. of the cardboard sheet. Note that the degree to which the folding center portion of the corrugated cardboard sheet is crushed can be changed by the degree of protrusion of the tip of the third ruled line portion 12c. The method is indicated by the description.

Others of the method of forming the streak line 21 in which a very strong crushing is applied to form a structure in which the outer streak line 21 is first bent and the folding starts as described in Patent Document 1. As a method,
As shown in FIG. 3 of Patent Document 1, the positional relationship between the two protrusions 16 and 17, the groove forming member 5, and the ruled pressing grooves 6 and 7 is the same as that of the two protrusions 16 and 17. The forming member 5 is moved closer to the left and right edges and separated from the outer edges of the ruled grooves 6, 7,
There is a method in which the cardboard sheet 20 is strongly sandwiched between the groove forming member 5 and the ridges 16 and 17, and strong crushing is performed, and this can be read from FIG.

Further, “0017” of “0017” of Patent Document 1 constitutes the bottom surface of the groove 18 that is slightly wider than the third groove forming member 5. The width of the third groove forming member 5 is slightly narrower than that of the third ruled line portion 12c.
However, Patent Document 1 does not show a description regarding a specific value of the width of the third groove forming member 5.
In the above-described method of forming the line 21 on which the very strong crushing is applied, a description regarding a specific value is shown with respect to the width of the third groove forming member 5 which is one of important elements. There is a problem in forming the streaks 21 on which the very strong crushing is formed.

Further, in “0017” of Patent Document 1, “If the ruled ruled line 12 is divided in this way, the width and height of the ruled ruled line 12 c and the depth of the groove 18 can be changed by appropriately changing the width and height of the third ruled line part 12 c. The thickness can be appropriately adjusted according to the material, thickness and the like of the cardboard sheet. Note that the degree to which the folding center portion of the corrugated cardboard sheet is crushed can be changed by the degree of protrusion of the tip of the third ruled line portion 12c. ], The widths of the first ruled line part 12a and the second ruled line part 12b are appropriately adjusted in conjunction with the width of the third ruled line part 12c.

In “0004”, “0005”, and “0006” of Patent Document 1, “the problem to be solved by the invention” in Patent Document 1 is described.
The problem to be solved by the invention in Patent Document 1 is
In particular, “0004” of Patent Document 1 “When the ruled ruled line 107a is at a position facing the concave portion of the core 109 of the cardboard sheet 108 as shown on the left side of FIG. 8A, FIG. As shown on the left side, the corrugated cardboard sheet 108 is crushed almost symmetrically to form a streak line, but as shown on the right side of FIG. When it is at a position facing the convex portion 109, the shape of the streaks formed as shown on the right side of FIG. Due to the problems indicated in the description,
In “0005” of Patent Document 1, “a gap (FIG. 9A), an overlap (FIG. 9B), a misalignment (FIG. 9C), etc. occur in the joint, There was a problem that the dimensions and the outside dimensions were not uniform. It is to solve the point indicated in the description.
The above “gap in the joint (FIG. 9A), overlap (FIG. 9B)” is a problem caused by buckling, and the above “displacement of joint (FIG. 9C)” is a fishtail. This is a problem caused by

However, if the widths of the first ruled line portion 12a and the second ruled line portion 12b are appropriately adjusted without the above-described specificities, the cardboard sheets of the first ruled line portion 12a and the second ruled line portion 12b are stepped. The crushing positions are different from the step top, step valley, and the middle thereof, and the crushing shapes of the streak 22 and the streak line 23 are different from each other, and therefore, the recesses 24 and 25 are broken.
Thus, in the invention of Patent Document 1, “0004” in Patent Document 1 “when it is at a position facing the convex portion of the center core 109, it is formed as shown on the right side of FIG. The shape of the muscle line becomes asymmetrical. The same phenomenon as described above also occurs in the first ruled line portion 12a and the second ruled line portion 12b adjusted as appropriate. That is, the invention of Patent Document 1 cannot solve the initial effect and solves it. The problem is not solved.
The present invention solves this problem, and the present invention is novel.

The contents of the prior art search conducted on Patent Document 2 are described below.
In the description, the terms, symbols, and figures used in Patent Document 2 and Patent Document 3 are cited as they are.
In particular, with respect to the reference numerals and drawings, it is necessary to thoroughly refer to Patent Document 2 and Patent Document 3 in order to prevent confusion with the reference numerals and drawings of the present invention.

In “Claims” of Patent Document 2, there is no description as to whether the back-cutting method or the front-cutting method is an important item in the punching process.

However, in “0042” of Patent Document 2, “the top surface of the cardboard 51 on the back surface side of the box has three groove-shaped portions 52a that are recessed downward, and the bottom surface of the cardboard 51 on the top surface side of the box”. From the description, it is presumed that Patent Document 2 is a back-cutting process.

Patent Document 2 “0013” “When the ruled line forming tool according to the present invention is used, the ruled line is formed in a clear W-shaped or overlapping W-shaped cross-section having a large height difference, and has a directionality in the length direction. Since it is widened while being held, the cardboard can be accurately folded along the crushed portion of the ruled line without being affected by the step of the cardboard, and a highly accurate box can be manufactured. As an effect of the invention of Patent Document 2, “a highly accurate box can be manufactured” is described.

And patent document 2 and patent document 3 are the same inventors.

However, in Patent Document 2 and Patent Document 3, which are the same inventors,
Patent Document 2 states in “0016” of Patent Document 3 that “in the ruled line member described in Patent Document 1, the concave groove provided at the center in the width direction of the ruled portion is V-shaped. Since the pair of protrusions provided on both sides of the groove for pressing the sheet are wedge-shaped with a sharp point at the tip, the surface pressure in the excessively pressed state of the cardboard sheet is high, and the cardboard sheet is damaged. There is a strong possibility of making it happen. As described by the same inventor, the problem of damaging the corrugated cardboard sheet is pointed out in the invention of Patent Document 2, as indicated by the wedge shape in which the tips of the pair of protrusions have sharp edges. There is a problem that the high accuracy box described as the effect of the invention of Patent Document 2 cannot be manufactured.

Further, “0020” of “0020” of Patent Document 2, as shown in FIG. 3, the ruled member 23 is formed with a V-shaped relief groove at the center of the lower tip, and both the tip corners and the relief groove are formed. The shoulder is formed in a curved shape. The escape groove 23a may be U-shaped. Here, the width of the groove 2 is formed wider than the width of the ruled member 23. And the width | variety of the lower end opening part of the escape groove 23a is comparable as the width | variety of the protrusion 3, or has become a little wider. ], The lower tip portion of the ruled member 23 is V-shaped and U-shaped, and the lower tip portion is formed by two parallel strips.

However, there is no specific description in Patent Document 2 regarding the width of the ruled member 23, and the positions of crushing the ridges at the lower end of the bottom of the two ridges of the ruled member 23 are different from the top, the step, and the middle. The crushed shapes of the terraces are different from each other, and the folding of the ruled lines varies, so that the folding along the ruled lines cannot be induced, and the highly accurate box described above as the effect of the invention of Patent Document 2 is manufactured. Can not do it.

The contents of the prior art search conducted on Patent Document 4 are described below.
In the description, the terms, symbols, and figures used in Patent Document 4 are cited as they are.
In particular, with respect to the reference numerals and drawings, it is necessary to thoroughly refer to Patent Document 4 in order to prevent confusion with the reference numerals and drawings of the present invention.

“Reverse crease pushing member” which is “Title of Invention” of Patent Document 4 and “0008” of “0008” of Patent Document 4 can be easily and reliably held when setting the crease pushing member on the crease pushing blade, and are in a stable state. It is an object of the present invention to provide a reverse ruled-pressing member that can be attached to a punching die plate surface. From the description,
Patent document 4 is an application of the member which forms a reverse ruled line.

The entire text including “Claim” of Patent Document 4 is not described as to whether it is a back-cutting method or a front-cutting method, which is an important item in punching.

However, the surface punching method is a face plate provided with a Thomson-type ruled member and a concave groove on the cutting plate, pressed from the surface side of the paperboard and some decorative cardboard sheets, put a crease ruled line, It is a processing method that folds to the groove side with the width of the edge of the groove, the crease line by the stamping member on the front side of the blank sheet punched out, and the edge of the groove groove on the back plate on the back side Since the crease crease line is formed in the strip, the front cutting method does not use a reverse rule, and Patent Document 4 is presumed to be a back-cutting process.

In reverse crease, which is a back-cutting process, reverse crease is performed with two parallel ruled members provided on the face plate on the cutting plate that forms the crease ruled line and Thomson type, The gap interval corresponding to the “interval L” described in “0017” of Patent Document 4 of the two ruled members needs to be set very narrow.

As described above, Patent Document 4 is an invention related to a reverse rule, and is another object of the present invention.

The contents of the prior art search conducted on Patent Document 5 are described below.
In the description, the terms, symbols and figures used in Patent Document 5 are cited as they are.
In particular, with respect to the reference numerals and drawings, thorough reference to Patent Document 5 is required to prevent confusion with the reference numerals and drawings of the present invention.

The entire text including “Claim” of Patent Document 5 is not described as to whether it is a back-cutting method or a front-cutting method, which is an important item in punching.

However, “0002”, which is the prior art of Patent Document 5, “score ruled lines that are perpendicular to the direction of the corrugated cardboard, and creases that are placed parallel to the direction of the corrugated board. There is a ruled line. ], It is estimated that patent document 5 is a back-cutting process. Moreover, it is estimated that patent document 5 is a back-cutting process from the point which patent document 5 does not have description about a face plate in particular.

Description of “Claim 1” of “Patent Document 5”, “When a crease ruled line is engraved in the step direction, the relationship is such that the engraving interval is narrower than the step pitch p”.
Patent Document 5 “0011” “This 180-degree bending crease ruled line ab, a′b ′ is set to an interval of 5 to 6 mm in the case of an A foot (thickness of about 5 mm) and a step pitch of 8.42 mm. From the description of `` I put two in parallel ''
The two crease ruled lines are set so that the engraving interval is narrower than the step pitch p.

“Claim 2 crease ruled lines ab and a′b ′” in “Claim 1” of Patent Document 5 are cut out so that both ends of the two crease ruled lines are almost arcuate. From the description “providing a cut portion of the corrugated cardboard”, the crease ruled line a′b ′ is set to be a short crease ruled line, and the crease ruled line ab is set to be a long crease ruled line.

According to “Claim 2” of Patent Document 5, “the arc-shaped cut portion extends over the two parallel crease ruled lines and extends beyond one of the ruled lines. The ruled line processing method in the raw material for cardboard boxes according to claim 1. Is described.

And, “0013” of Patent Document 5 “When folding cardboard, stress can be concentrated on one ruled line a′b ′ of the two ruled lines, and the starting point of folding is surely the ruled line a′b ′. Then, since stress concentrates on the other ruled line ab, the inner cylinder forming pieces 8 and 9 can be easily bent by 180 degrees. From the description of Patent Document 5, Folded from the crease ruled line a′b ′, and then the crease ruled line It shows that it is an invention that breaks ab.

That is, the “problem to be solved by the invention” in Patent Document 5 is that the bending stress does not change (does not shift) even if the ruled line enters at any position, and the bending stress concentrates on the ruled line part. In order to be easily folded at a fixed position, two crease ruled lines parallel to a relationship in which the engraving interval is narrower than the step pitch p and an arc-shaped cut portion are essential techniques.

In addition, the invention of Patent Document 5 that uses the arc-shaped cut portion that extends over two parallel crease ruled lines and extends beyond one of the ruled lines has a notch in the box. The A type and B type boxes cannot be used because their external shapes change.

As described above, Patent Document 5 has a structure different from that of the present invention, and the present invention is novel.

The contents of the prior art search conducted on Patent Document 6 are described below.
In the description, the terms, symbols and figures used in Patent Document 6 are quoted as they are.
In particular, with respect to the reference numerals and diagrams, thorough reference to Patent Document 6 is required to prevent confusion with the reference numerals and drawings of the present invention.

In “Claims” of Patent Document 6, there is no description as to whether the back-cutting method or the front-cutting method is an important item in the punching process.

However, in “0002” of Patent Document 6, a plurality of products such as canned beer are automatically applied to a packaging case made of cardboard sheets in which the opening of the rectangular body is closed by a pair of inner flaps and a pair of outer flaps. In the packaging device to be packed in, after bending each of the outer flap and the inner flap outward from the outer peripheral surface of the rectangular body to the position where it bends outward, the product is put into the interior through the opening of the body. After the stuffing, the inner flap and the outer flap are folded inward to close the body opening. ”Is presumed to be back-cutting.

Patent Document 6 “0005” “In the above corrugated cardboard sheet A0, if the right side portion of the front side ruled line B3 is the flap of the packaging case, the flap is the back surface of the corrugated cardboard sheet A0 before the product is packed in the packaging case. After the product is packed, it is bent approximately 90 ° to the surface side of the cardboard sheet A0. "
As described above in “0032”, which is “Effect of the invention” in Patent Document 6, in the present invention, ruled lines can be placed at the same position on the front and back sides of the cardboard sheet. It can be folded with extremely high accuracy, and a ruled cardboard sheet with excellent folding accuracy can be obtained. Is described in Japanese Patent Application Laid-Open Publication No. 2004-28103. In this invention, the sheet is bent 90 ° to the front side after being bent to the back side, the sheet can be bent to both the front and back sides with extremely high accuracy, and the flap is bent to 90 °. is there.
The present invention is an invention in which the second vertically folded crease ruled line and the fourth vertically folded crease ruled line of the box are folded 180 degrees toward the inside of the box, and is an invention in a field different from Patent Document 6.

Incidentally, in “0026” of Patent Document 6, “the strength at the positions of the ruled lines B1 and B2 is weak. By folding the cardboard sheet A to the back side or the front side, the cardboard sheet A has the ruled lines B1 and B2 as the folding lines. The cardboard sheet A can be bent with extremely high accuracy. In particular, the portion “the strength at the positions of the ruled lines B1 and B2 is weak” means that the weak lines do not mean that the ruled lines B1 and B2 are weakly formed. This means that the ruled line torque is weakly formed, that is, it is easy to bend at the positions of the ruled lines B1 and B2.

The contents of the prior art search conducted on Patent Document 7 are described below.
In the description, the terms, symbols, and figures used in Patent Document 7 are cited as they are.
In particular, with respect to the reference numerals and drawings, thorough reference to Patent Document 7 is required to prevent confusion with the reference numerals and drawings of the present invention.

Patent Document 7 “Claim 1” “Auxiliary mold material (2) detachably fitted in a ruled pressing direction to the ruled pressing plate (32) provided on the first mold (3a), and the auxiliary mold material (2) and a main mold material (1) that is removably fitted in the crease pushing direction and has a crease pushing portion facing the crease pushing plate (32),
Patent Document 7 is an application relating to a die for a ruled groove of a punching die composed of an auxiliary die (2) and a main die (1).

In “Claims” of Patent Document 7, there is no description as to whether the back-cutting method or the front-cutting method is an important item in the punching process.

Patent Document 7 “0012” “Here, the ruled pressing portion is a groove portion (11) normally opened to the auxiliary mold material (2) side, and the fitted portion is fitted in the groove portion (11). Convex ridges (22), but there are also cases where creases are pushed in the opposite direction.In the case of this reverse crease pushing mold, the main mold (1) is provided with ridges, and auxiliary molds (2 ) Is formed into a groove that fits into the ridge, and is creased in the opposite direction by the ridge and the crease pushing plates (32) and (32). (For example, FIG. 12) ”, FIG. 12 of Patent Document 7 is a description regarding a reverse ruled line,
The present invention is an invention in which the second vertically folded crease ruled line and the fourth vertically folded crease ruled line of the box are folded 180 degrees toward the inner side of the box, and is an invention in a field different from the description relating to the reverse ruled line as shown in FIG. It is.

By the way, the crease ruled line that reversely folds with the two ruled pressing plates (32) (32) parallel to the reverse ruled line and the ridges provided on the main mold (1) is side-by-side processed to the surface side of the sheet The crease ruled line needs to be strongly formed because of the structure that folds outside the box, and is formed by setting the gap between the two pressing plates parallel to the ridges to be very narrow.

The contents of the prior art search conducted on Patent Document 8 are described below.
In the description, the terms, symbols, and figures used in Patent Document 8 are cited as they are.
In particular, with respect to the reference numerals and drawings, thorough reference to Patent Document 8 is required to prevent confusion with the reference numerals and drawings of the present invention.

In Patent Document 8, there is no description as to whether it is a reverse punching method or a front punching method, which is an important item in punching.

As a tray made of corrugated cardboard sheets used in a case for gift cases, case boxes for fruits and vegetables such as tomatoes and grapes in “0002” of Patent Document 8, the one shown in FIG. 12 is conventionally known. . "
“Thus, each side frame 41 and each end frame 42 are slightly larger than the thickness of the corrugated cardboard sheet S and are provided with an outer plate 43 and an inner plate 45 which are provided with a slight gap therebetween. The outer end plate 46 and the inner end plate 48 form a double frame, and the tray A has a square frame shape with a pair of end frames 42 facing a pair of side frames 41 facing each other. From the description
Patent Document 8 is an invention relating to a frame of a cardboard sheet tray.

FIG. 11 of Patent Document 8 and “0006” of Patent Document 8 “Here, the upper end portion 44 of the side frame 41 and the upper end portion 47 of the end frame 42 are provided by forming a pair of parallel ruled lines L1 and L2. . The distance between the pair of parallel ruled lines L1 and L2 is slightly larger than the thickness t of the corrugated cardboard sheet S. ”
The upper end 44 and the upper end 47 correspond to the frame, and the interval between the frames is formed with an interval slightly larger than the thickness t of the cardboard sheet S.

Patent Document 8 is an invention relating to a rectangular frame of a corrugated sheet tray, and the frame interval is formed with an interval slightly larger than the thickness t of the corrugated sheet S, and is 90 degrees and 90 degrees folded to 180 degrees. It is an invention that wraps around,
The present invention is not related to the frame, but is an invention in which the second vertically folded crease ruled line and the fourth vertically folded crease ruled line of the box are folded 180 degrees inside the box, and is an invention in a field different from Patent Document 8.

The contents of the prior art search conducted on Patent Document 9 are described below.
In the description, the terms, symbols and figures used in Patent Document 9 are cited as they are.
In particular, with respect to the reference numerals and drawings, it is necessary to thoroughly refer to Patent Document 9 in order to prevent confusion with the reference numerals and drawings of the present invention.
Further, since Patent Document 9 does not have a paragraph number, it is cited using a description method such as “[(4)] around the eighth line”.

In “Claims” of Patent Document 9, there is no description as to whether it is a reverse punching method or a front punching method, which is an important item in punching.

As a “detailed description of the invention” in Patent Document 9, “the present invention always has a line that can be folded 180 ° along the line in the (8) line” of [(4)] of Patent Document 9. From the description of “method of processing into corrugated paper”, the object in Patent Document 9 is described.

As the “claims” of Patent Document 9, “the two lines of a predetermined width of the second line of the predetermined width are set at a time difference between the first line and the second line in [(1)] of Patent Document 9”. In order to solve the above-described object, Patent Document 9 has a structure in which two strips of a predetermined width are processed into a corrugated cardboard sheet.

Then, regardless of the relational position between the “silence lines k, k ′ and the rim crests in the twelfth line of [9] of Patent Document 9, the corrugated paper 20 is always correctly moved 180 along the crease. ° Can hold. In Japanese Patent Application Laid-Open No. 2003-228867, it can be read that the document does not take into consideration the “relative position of the ridge lines k and k ′ and the rim of the inner rim”.

As described above, in Patent Document 9, “regardless of the relationship between the ridges k and k ′ and the inner rim crest, the corrugated paper 20 is always correctly folded 180 ° along the crease. If you do not consider the relative positions of the ridges k, k 'and the inner rim mountain,
Around the 19th line of Patent Document 9 [(3)], only the rim on one side of the Kei wire is deformed, and a part that bends with the Kei wire as an end also appears. The point that the rim of the inner rim deforms and bends is not solved.

In order to carry out the above-mentioned object of “Patent Document 9, a method for processing corrugated paper into a corrugated paper that can always be folded 180 ° along the line”, the lines k and k ′ and the inner rim are used. This is impossible without taking into account the fact that the inner rim crest is deformed and bent due to the position of the crest, and Patent Document 9 does not completely solve the object.

Further, as “claims” of Patent Document 9, from the description of “the surface of the receiving roll was coated with polyurethane rubber” around the ninth line of [(2)] of Patent Document 9, Patent Document 9 Is a structure in which the surface of the receiving roll is coated with polyurethane rubber, the receiving roll is smooth, and the structure is different from the present invention using a face plate having convex stripes or a face plate having concave grooves, and the present invention has novelty. is there.

In addition, as the “claims” of Patent Document 9, “the two lines of a predetermined width between the first and second lines in the sixth line of [(1)]” of Patent Document 9 From the description of “processing with a time difference”, Patent Document 9 is a structure in which a corrugated sheet is processed with a time difference between two lines of a predetermined width, and the structure is different from the present invention. Has novelty.

In addition, “the width of the two lines is about 1.05 to 1.45 times the thickness of the paper around the tenth line of [(1)] of Patent Document 9 of“ Claims ”of Patent Document 9. `` Set to double ''
“When the tooth width A is more than 1.5 times the thickness of the paper, the box becomes octagonal and the shape becomes unstable. ”
Patent Document 9 is different in structure from the present invention, and the present invention is novel.

The contents of the prior art search conducted on Patent Document 10 are described below.
In the description, the terms, symbols, and figures used in Patent Document 10 and Patent Document 11 are cited as they are.
In particular, with respect to the reference numerals and drawings, it is necessary to thoroughly refer to Patent Document 10 and Patent Document 11 in order to prevent confusion with the reference numerals and drawings of the present invention.

In “Claim” of Patent Document 10, there is no description as to whether it is a back-cutting method or a front-cutting method, which is an important item in punching.

However, from the description of Patent Document 11 which is a prior art document in Patent Document 10, it is presumed that Patent Document 10 is a back-cutting process. Specifically, from the description of “Crushing from the inner surface during bending” of “0013” of Patent Document 11, it is presumed that Patent Document 10 is a back-cutting process.

In Patent Document 10, which is presumed to be a back-cutting process,
“0009” of Patent Document 10 “Especially, when the corrugated board 51 is supplied in a state in which the long extending step 53 is not even parallel to the ruled member 23 extending long, Since a part that is crushed and a part that is not crushed are generated, a part that is easily bent and a part that is not easily bent are generated in the ruled line 52, and the ruled line 52 becomes unclear and cannot be bent accurately. "
Patent Document 10 “0011” “This invention is to improve the ruled line forming groove member to provide a ruled line that can be bent accurately at a predetermined position. From the description of
Patent Document 10 is an invention of a groove member for forming a ruled line for accurately folding a corrugated cardboard 51 at a predetermined position when the corrugated cardboard 51 is supplied in a state in which it is not even parallel to the ruled rule member 23 at the time of back-cutting. The present invention, in particular, is different in structure from claim 2 of the present invention described in relation to “a punching method by surface punching by a Thomson type to obtain a blank sheet that can be folded 180 degrees”, and the present invention is novel.

Next, prior art investigations were conducted on Patent Document 12, Patent Document 13, Patent Document 14, and Patent Document 15.

These documents of Patent Document 12, Patent Document 13, Patent Document 14, and Patent Document 15 are prior applications of the applicant of the present invention.

These Patent Document 12, Patent Document 13, Patent Document 14 and Patent Document 15 are ruled methods using a face plate provided with a single ruled member and ridges, and are different in structure from the present invention. There is sex.

Next, prior art search was conducted on Patent Document 16.

Patent Document 16 is the prior application of the applicant of the present invention.

Patent Document 16 is a ruled method using one ruled member and a face plate having a trapezoidal cross section. The structure is different from the present invention and the present invention is novel.

Next, a prior art search was conducted on Patent Document 17.

Patent document 17 is the prior application of the applicant of the present invention.

Patent Document 17 is a frame marking method using a face plate provided with two ruled members and two ridges. The structure is different from the present invention, and the present invention is novel.

Next, prior art search was conducted on Patent Document 18.

Patent Document 18 is the prior application of the applicant of the present invention.

Patent Document 18 is a ruled method of reverse ruled by a face plate provided with a single ruled member and a face plate provided with ridges. The structure is different from the present invention, and the present invention is novel.

In addition, the prior art document which has entered the specific numerical value regarding the width | variety of the protruding item | line of the face plate used for a surface punching method, or a groove groove was not found.

The double-sided corrugated cardboard sheet 21 has a thickness, a flute, and a step pitch 26. The double-sided cardboard sheet 21 is punched with a Thomson mold 1 to form a blank sheet 22 of a box. When the second vertically folded crease ruled line 31 and the fourth vertically folded crease ruled line 32 are gradually folded from a flat state to 180 degrees, the inner periphery and the outer periphery of the front liner side and the back liner side at each crease ruled line break point. The dimensional difference gradually increases.

That is, when the second vertical crease crease line 31 and the fourth vertical crease crease ruled line 32 in the parallel direction are gradually folded at 180 degrees from the flat state along the steps by the gluer, a pulling force acts on the front liner side. A phenomenon occurs where the escape area is not fixed on the back liner side.
Without considering these things, for example, two parallel first ruled members 41 each of the second vertically folded ruled member and the fourth vertically folded ruled member of the Thomson type 1 by a punching method by back-piercing When the second ruled member 42 is formed with an appropriate interval width as shown in FIGS. 2b and 2c, when the blank sheet 22 is folded 180 degrees with a gluer, the fish tail is shown in FIGS. In addition, the second buckling 25 or the like occurs at a position 10 to 15 mm away from the crease ruled line.
For this reason, a bonding failure occurs in the joint portion of the box, and a box different from the original design dimension is manufactured.

Further, as shown in FIG. 10, the double-sided corrugated cardboard sheet 21 has a stepped pitch 26 with a constant interval, and the second longitudinal crease crease 31 and the fourth longitudinal crease crease if the design dimensions of the box change. The position of the vertical folding ruled line of the ruled line 32 changes,
For example, in the punching method by back-cutting, the second vertical folding ruler member and the fourth vertical folding ruler member of the well-known Thomson type 1 are respectively connected to two parallel first ruler members 41 and second pressurizing members. If the ruled member 42 is formed with an appropriate width,
As shown by b and c in FIG. 2, the consistency between the distance 43 as viewed from the center of the first ruled member and the second ruled member and the corrugated pitch 26 of the double-sided corrugated cardboard sheet 21 to be punched is I can't take it,
The positions of crushing the steps of the double-sided corrugated cardboard sheet 21 of the first ruled member 41 and the second ruled member 42 are different from the step top 261, step 262, and the middle 263, respectively.
As a matter of course, the crushed shapes of the first crease ruled lines 33 and the second crease ruled lines 34 formed on the blank sheet 22 are different from each other, and the first crease ruled lines 33 and 33 are different from each other. Folding at the second crease ruled line 34 varies, and if the blank sheet 22 is glued together in this state, poor bonding of the box such as the fishtail or the second buckling 25 occurs, and a box with high accuracy cannot be manufactured. .

Further, even in the punching method by front punching, when the well-known Thomson-type second vertically folded ruled member and the fourth vertically folded ruled member and the groove width 552 are formed at appropriate intervals,
As shown by b and c in FIG. 3, the consistency between the width 552 of the concave groove and the stepped pitch 26 of the double-sided corrugated cardboard sheet 21 to be punched cannot be obtained.
The crushing positions of the corrugated sheet of the double-faced corrugated cardboard sheet 21 determined by the ruled member and the width 552 of the groove are different from the step top 261, the step valley 262, and the middle 263 thereof,
As a matter of course, the crushed shapes of the first crease ruled lines 33 and the second crease ruled lines 34 formed on the blank sheet 22 are different from each other, and the first crease ruled lines 33 and 33 are different from each other. Folding at the second crease ruled line 34 varies, and if the blank sheet 22 is glued together in this state, poor bonding of the box such as the fishtail or the second buckling 25 occurs, and a box with high accuracy cannot be manufactured. .

When the first crease ruled line 33 and the second crease ruled line 34 of the blank sheet 22 processed by the punching method using the reverse punching method and the front punching method are folded at 180 degrees with a gluer, different shapes are obtained. Due to the collapsed shape of the stepped mountain, bending failure such as second buckling 25 occurs, and when the blank sheet 22 is glued together in this state, bonding failure of the box such as fishtail or second buckling 25 occurs, There is a problem that a box with high accuracy cannot be manufactured.
The present invention has been made in view of the above-described conventional problems, and the second vertical folding crease line 31 and the fourth vertical folding crease of the double-sided corrugated cardboard box regardless of the back-cutting or front punching method. An object of the present invention is to provide a punching method in which the ruled line 32 can be accurately folded at 180 degrees to prevent poor bonding of a box such as a fishtail or a second buckling 25.

As means for solving the above problems, the punching method according to the present invention is:
In the punching method by double-sided corrugated cardboard sheet 21 using the Thomson mold 1 to obtain a blank sheet 22 capable of folding the second vertically folded crease ruled line 31 and the fourth vertically folded crease ruled line 32 in the corrugated cardboard box exactly 180 degrees, The second longitudinally folded ruler member and the fourth longitudinally folded ruler member in the parallel direction along the step of the double-sided corrugated cardboard sheet 21 provided in the Thomson mold 1 are respectively divided into two parallel first ruler members 41 and Each of the two ruled members 42,
The base width 52 of the face plate to be stuck on the cutting plate is wider than the interval between the first ruled member 41 and the second ruled member 42,
The face plate 5 has a shape having a ridge 51 for forming the extension allowance 23 at a position facing the middle between the first ruled member 41 and the second ruled member 42,
The punching method is characterized in that the interval 43 as viewed from the center of each of the first ruler member and the second ruler member is set to be equal to the interval of the stepped pitch 26 of the double-sided corrugated cardboard sheet 21. Is.

Next, as a means for solving the above problems, the punching method according to the present invention is:
In the punching method by punching the double-sided corrugated cardboard sheet 21 using the Thomson mold 1 to obtain a blank sheet 22 capable of folding the second vertically folded crease ruled line 31 and the fourth vertically folded crease ruled line 32 in the corrugated cardboard box exactly 180 degrees, A face plate 5 having a concave groove 55 having a face plate thickness 53 of 0.7 mm to 1.5 mm is stuck on the cutting plate,
The cutting tool 6 is provided in the Thomson mold 1, and the second vertical folding ruler member and the fourth vertical folding ruler member in the parallel direction along the step of the double-sided corrugated cardboard sheet 21 provided in the Thomson mold 1 are replaced with the left ruler member 441 and Three rulers comprising a right ruler member 442 and a central ruler member 443 whose height dimension is set higher than that of the left ruler member 441 and the right ruler member 442 in order to form the extension allowance 23. Each formed by the ruled member group 44 formed of members,
The groove 55 is provided at a position facing the ruled member group 44;
The punching method is characterized in that the interval 520 is equal to the interval of the stepped pitch 26 of the double-sided corrugated cardboard sheet 21 in which the width 552 of the groove is punched.

According to the punching method of the present invention,
The blank sheet 22 processed by the punching method of the present invention,
As the first effect,
As shown in FIG. 5, the second vertically folded crease ruled line 31 and the fourth vertically folded crease ruled line 32 include two parallel first crease ruled lines 33 and second crease ruled lines on the back side of the blank sheet 22, respectively. 2, and as shown in FIG. 2 a, FIG. 8, FIG. 3 a, and FIG. 9, the distance between the first crease ruled line 33 and the second crease ruled line 34 is the distance between the step pitch 26. The first crease ruled line 33 and the second crease ruled line 34 have the same crushed shape as the first crease ruled line 33 and the second crease ruled line 34, respectively. It becomes a shape.
As shown in FIG. 4c, the Y-shaped relief 24 is reliably formed at the time of folding with a gluer, and when the sheet is folded at 180 degrees as described above, the pulling force acts on the front liner side. This has the effect of solving the phenomenon that the escape location is not determined on the liner side.
The second effect is
As shown in FIG. 8 and FIG. 9, the elongation allowance is formed by shallowly denting the surface side of the blank sheet 22, which is the surface facing the middle between the first crease ruled line 33 and the second crease ruled line 34. Since the part 23 is formed,
The pulling force applied to the front liner side that occurs when folding with a gluer has an effect of coordinating the pulling force by flattening the extension allowance 23 that has been shallowly recessed and synchronized with the movement of the folding with a gluer. is there.
As a third effect,
Since the interval between the first crease ruled line 33 and the second crease ruled line 34 is equal to the thickness when the double-sided corrugated cardboard sheet 21 is folded 180 degrees,
(See Table 1 above and below)
The second vertical crease crease ruled line 31 and the fourth vertical fold crease ruled line 32 can be accurately folded.
By the above three effects, it is possible to eliminate the occurrence of the fishtail, the second buckling 25, and the like, and to produce a box as originally designed without causing poor bonding at the box joint.

Note that the interval between the first crease ruled line 33 and the second crease ruled line 34 described above is equal to the thickness when the double-sided corrugated cardboard sheet 21 is folded 180 degrees, and the second vertically folded crease ruled line 31 and As a supplement to the point that the fourth vertically folded crease ruled line 32 can be folded correctly,
According to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The B flute has a stepped pitch 26 of 6.0 mm and the thickness when the sheet is folded 180 degrees is the same as 6.0 mm, and the E flute has a stepped pitch 26 of 3.2 mm and the sheet is folded 180 degrees. The thickness at the time is the same as 3.2 mm.
So for B Flute and E Flute,
The back-cutting method uses a line-contact type round ruler member, and the interval dimension 43 seen from the center of the first ruler member and the second ruler member is equal to the interval of the stepped pitch 26. Set with
In the surface punching method, the width 552 of the groove groove of the face plate 5 is set at an interval equal to the interval of the stepped pitch 26,
The interval between the first crease ruled line 33 and the second crease ruled line 34 was set to be equal to the thickness when the double-sided cardboard sheet 21 was folded 180 degrees.

And according to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The flute step pitch 26 of A flute is 8.8mm and the thickness when the sheet is folded 180 degrees is 10mm, so there is a difference of 1.2mm,
The step pitch 26 of C flute is 7.5 mm and the thickness when the sheet is folded 180 degrees is 8.0 mm, so there is a difference of 0.5 mm.
So for A flute and C flute,
In the back-cutting method, the A flute is about 0.6 mm which is half of the difference of 1.2 mm, and the C flute is about 0.25 mm which is half of the difference of 0.5 mm. It is necessary to set a square contact ruler of the surface contact type, and the interval 43 as viewed from the center of the first ruler member and the second ruler member is equal to the interval of the step pitch 26. The distance between the first crease ruled line 33 and the second crease ruled line 34 is set to the thickness when the double-sided corrugated cardboard sheet 21 is folded by 180 degrees. The intervals were almost equal.
With respect to the A flute and C flute of the surface punching method, the difference of 1.2 mm and 0.5 mm cannot be completely accommodated.

It is the schematic which shows the outline concerning embodiment of this invention. a shows the punching method of the double-sided corrugated cardboard sheet according to the present invention, and b shows the punching method of the double-sided cardboard sheet according to the present invention. It is the schematic which showed the relationship of the space | interval dimension seeing from the center of the step pitch of the double-sided corrugated-cardboard sheet | seat by the back side in this invention, and a 1st ruled member and a 2nd ruled member. a illustrates the state of the present invention where the relationship is equally spaced, and b and c illustrate the state where the relationship is not consistent. It is the schematic which showed the relationship between the step pitch of the double-sided corrugated-cardboard sheet | seat by front removal in this invention, and the width of a ditch | groove groove | channel. a illustrates the state of the present invention where the relationship is equally spaced, and b and c illustrate the state where the relationship is not consistent. It is the schematic which showed the process of folding of the crease ruled line in the gluer process of the blank sheet | seat obtained with the punching method in this invention, and a, b, and c showed the blank sheet from the side. a shows a blank sheet obtained by the punching method according to the present invention, and b shows a Y-shape on the inner side of the blank sheet when the crease ruled line on which the blank sheet comes inward in the gluer process is first folded at 90 degrees. FIG. 3C shows that one side of the relief is formed, and c indicates that the crease ruled line which is on the outside in the gluer process is folded at 90 degrees to form the other side of the Y-shaped relief on the inside of the blank sheet. It shows that a Y-shaped relief is formed in the blank sheet folded every time, and an enlarged schematic view of the vicinity of the Y-shaped relief. The blank sheet obtained by the punching method in the present invention and a partially enlarged view are shown in a front view. It is the schematic which shows the outline of the face plate used with the punching method by the back side of the double-sided cardboard sheet | seat in this invention. It is the schematic which shows the outline of the face plate used with the punching method by the front punching of the double-sided cardboard sheet | seat in this invention. It is the schematic which expanded and illustrated especially the 1st crease ruled line, the 2nd crease ruled line, and the expansion margin part vicinity of the blank sheet obtained by the punching method by the back side of the double-sided corrugated cardboard sheet in this invention. Since the blank sheet obtained by the punching method in the present invention starts to be folded from the crease ruled side which comes inward in the gluer process, it is first folded from the first crease ruled line in the gluer process at a, and then the second crease. The movement of folding the ruled line is indicated by an arrow, and in b, the first crease ruled line is folded by the first lure process in the gluer process, and then the movement of folding the first crease ruled line is indicated by an arrow. It is the schematic which expanded and illustrated especially the 1st crease ruled line, the 2nd crease ruled line, and the expansion margin vicinity of the blank sheet obtained by the punching method by the front punching of the double-sided cardboard sheet in the present invention. Since the blank sheet obtained by the punching method in the present invention starts to be folded from the crease ruled side which comes inward in the gluer process, it is first folded from the first crease ruled line in the gluer process at a, and then the second crease. The movement of folding the ruled line is indicated by an arrow, and in b, the first crease ruled line is folded by the first lure process in the gluer process, and then the movement of folding the first crease ruled line is indicated by an arrow. It is the schematic showing the step pitch, step top, step valley, and the middle in a double-sided cardboard sheet. It is the schematic which shows the outline in the gluer process of the blank sheet obtained by the punching method in this invention. It is the schematic which shows the outline of the ruled member group of shapes, such as integral molding and a ruled line. It is the schematic which shows the outline of the box which the fishtail generate | occur | produced. It is the schematic which shows the outline of the blank sheet which the 2nd buckling generate | occur | produced.

In consideration of the above, in order to solve the problems, the contents of the Thomson mold 1, the face plate 5 and the like in the punching operation of the double-sided corrugated cardboard sheet 21 in the punching method of the present invention were examined closely.

As shown in FIG. 1 a and FIG. 2, the reverse punching method is the Thomson die 1 in which the first vertical folding ruler member and the second vertical folding ruler member are arranged in parallel with each other. It is composed of a ruled line member 41 and a second ruled line member 42, and punches out a distance dimension 43 as viewed from the center of the first ruled line member and the second ruled line member. The interval is equal to the interval.

In the face plate 5 to be stuck on the cutting plate in the reverse punching method,
As shown in FIG. 1a, the base width 52 of the face plate is wider than the distance between the first ruled member 41 and the second ruled member 42,
A shape having a ridge 51 for forming the extension allowance 23 at a position facing the middle between the first ruled member 41 and the second ruled member 42,
With a well-known structure in which an adhesive is attached to the back surface of the face plate 5 and protected with a release paper,
The thickness 53 of the face plate is changed from 1.0 mm to 2.0 mm,
As the distribution, the thickness 531 of the base plate is 0.6 to 1.2 mm, the height 532 of the ridge is 0.4 to 0.8 mm, the width 54 of the ridge is 1.0 to 3.0 mm,
Depending on the material and the flute of the double-sided corrugated cardboard sheet 21 to be punched out, a combination of these is formed.

However, since the number of combinations of the face plates 5 increases, the work of selecting the face plate 5 becomes complicated.
For E flute, the face plate has a thickness 53 of 1.0 mm,
As the distribution, the thickness 531 of the base plate was 0.6 mm, the height 532 of the ridges was 0.4 mm, and the width 54 of the ridges was 1.0 mm.
And for A flute, C flute, B flute, the thickness 53 of the face plate is 1.5 mm,
As the distribution, the base plate thickness 531 was 0.8 mm, the ridge height 532 was 0.7 mm, and the ridge width 54 was 1.5 mm to 3.0 mm.
The two face plates 5 for the E flute and the A flute, C flute, and B flute are used as a general reference, and the material and flute of the double-sided corrugated cardboard sheet 21 to be punched are selected.
However, it is not limited to this.
Further, if the thickness 53 of the face plate is 2.0 mm or more, troubles in transporting the double-faced corrugated cardboard sheet 21 during punching and cutting chatter at the cut edge of the blank sheet 22 due to the Thomson die 1 blade 6 occur. 53 is desirably suppressed to 2.0 mm at the maximum.

As shown in FIG. 1 b, the front punching method is such that the blade 6 is provided in the Thomson die 1, and the second longitudinally folded ruled member in the parallel direction along the step of the double-sided corrugated cardboard sheet 21 provided in the Thomson die 1. And the fourth vertical folding ruler member, the left ruler member 441 and the right ruler member 442, and the height dimension to form the extension allowance 23, than the left ruler member 441 and the right ruler member 442. Each of them is formed by a ruled member group 44 formed of three ruled members made of a central ruled member 443 set high.
For example, in the front-cutting method of the E flute double-sided corrugated cardboard sheet 21, the Thomson die 1 has the left ruled member 441 in which the height of the cutter 6 is 23.6 mm and the height dimension is 22.0 mm. The ruled member group 44 formed of three ruled members, which includes a ruled member of the right ruled member 442 and the central ruled member 443 having a height of 22.5 mm, is used.
The ruled member group 44 including the ruled members of the left ruled member 441 and the right ruled member 442 and the central ruled member 443 is appropriately set according to the material and flute of the double-faced corrugated cardboard sheet 21 to be punched in this way. .

As shown in FIG. 7, in the face plate 5 attached on the cutting plate in the front punching method,
A thickness 53 of the face plate was 0.7 mm to 1.5 mm, and the groove 55 was provided at a position facing the ruled member group 44. The width 552 of the groove is equal to the interval of the stepped pitch 26 of the double-sided cardboard sheet 21 to be punched.
The face plate 5 has a well-known structure in which an adhesive is attached to the back surface and protected with a release paper.
For example, in the front punching method for the E flute double-sided corrugated cardboard sheet 21, the thickness 53 of the face plate is 1.0 mm.
The thickness 53 of the face plate is appropriately set according to the material and the flute of the double-faced corrugated cardboard sheet 21 punched out in this way.

In the back-cutting method, the Thomson mold 1 with the face plate 5 attached is attached to a chase of a punching machine, and then the cutting plate is lifted to transfer the face plate 5 onto the cutting plate.
(As a method of attaching the face plate 5 to the Thomson mold 1, a known technique such as “FIG. 12” of “Patent Document 7” is used.)
Next, when the paper is fed with the back side of the double-sided corrugated cardboard sheet 21 up to the punching machine, the cutting plate is raised and pressed by the punching machine,
As shown in FIG. 1a and FIG. 8, the double-sided corrugated cardboard sheet 21 is cut into a predetermined shape, and on the back side of the blank sheet 22, two parallel strong first crease ruled lines 33 and second crease lines are formed. Ruled lines 34 are formed,
As shown in FIG. 2a and FIG. 8, the interval between the first crease ruled line 33 and the second crease ruled line 34 is equal to the interval between the stepped pitches 26, and the first crease ruled line 33 and The shape where the double-sided corrugated cardboard sheet 21 is crushed at the second crease ruled line 34 is the same shape at the first crease ruled line 33 and the second crease ruled line 34.
Then, the first sheet ruler member 41, the second ruler member 42, and the convex strips 51 of the face plate 5 form a shallow recess portion 23 on the surface side of the blank sheet 22, and the blank sheet 22 goes up.

Further, in the surface punching method, the Thomson mold 1 having the face plate 5 attached thereto is attached to a chase of a punching machine, and then the cutting plate is lifted to transfer the face plate 5 onto the cutting plate.
(As a method of attaching the face plate 5 to the Thomson mold 1, a known technique such as “FIG. 11” of “Patent Document 7” is used.)
Next, when the sheet is fed to the punching machine with the surface side of the double-sided cardboard sheet 21 facing up, the cutting plate is raised and pressed by the punching machine, as shown in FIG. Is cut into a predetermined shape, and the back side of the blank sheet 22 is strongly sandwiched between the ruled members of the left ruled member 441 and the right ruled member 442 and the edge 551 of the grooved groove, each having two parallel strong A first crease ruled line 33 and a second crease ruled line 34 are formed,
As shown in FIG. 3a and FIG. 9, the interval between the first crease ruled line 33 and the second crease ruled line 34 is equal to the interval of the stepped pitch 26, and the first crease ruled line 33 and The shape where the double-sided corrugated cardboard sheet 21 is crushed at the second crease ruled line 34 is the same shape at the first crease ruled line 33 and the second crease ruled line 34.
Then, the double-sided corrugated cardboard sheet 21 is weakly pressed by the central ruled member 443 and the bottom portion of the groove 55, and a shallow recess is formed on the surface side of the blank sheet 22 to form a blank sheet. 22 goes up.

Next, as shown in FIG. 11, the extracted blank sheet 22 is glued on the blank sheet 22 in the gluer process.
The blank sheet 22 fed out from the paper feeding unit is sandwiched between a pair of upper and lower feed belts 7 provided on the left and right sides in the vicinity of the second vertical folding crease ruled line 31 and the fourth vertical fold crease ruled line 32. While moving forward, the glue is applied to the glue margin portion of the blank sheet 22 by a glue roll during that time, and is fed to the wide holding belt 8.
Further, the blank sheet 22 moves forward while being fed by the pair of upper and lower feed belts 7 and synchronizes with the forward movement. As shown in FIGS. The fold crease ruled line 31 and the fourth vertical fold crease ruled line 32 start to fold from the crease ruled line that comes to the inside of the first crease ruled line 33 and the second crease ruled line 34 respectively. Due to the thickness, internal contact begins to occur, and when the internal contact resistance becomes stronger, the crease ruled line that comes outside the first crease ruled line 33 and the second crease ruled line 34 starts to fold. The blank sheet 22 is folded at 180 degrees.
As a result of the mutual belt action of the series of upper and lower pair of feed belts 7 and wide holding belt 8, as shown in FIG. One of the Y-shaped reliefs 24 is formed on the inner side, and then the crease ruled line on each outer side is folded at 90 degrees, and one of the Y-shaped reliefs 24 is placed on the inner side of the other blank sheet 22. Is formed, and the Y-shaped relief 24 is reliably formed.
The Y-shaped relief 24 is formed to solve the above-mentioned phenomenon that when it is folded 180 degrees, the pulling force works on the front liner side and the escape location is not fixed on the back liner side. There is an effect to.
This effect is the first effect.

As a second effect, the pulling force acts on the front liner side in synchronism with the folding movement in the gluer process, but the pulling allowance portion 23 which is shallowly recessed is flattened so that the pulling force is flattened. There is a harmony effect.

As a third effect, the distance between the first crease ruled line 33 and the second crease ruled line 34 is equal to the thickness when the double-sided cardboard sheet 21 is folded 180 degrees,
(See “Table 1” and description above)
The second vertical crease crease ruled line 31 and the fourth vertical fold crease ruled line 32 can be accurately folded.

By the above three effects, it is possible to eliminate the occurrence of the fishtail, the second buckling 25, and the like, and to produce a box as originally designed without causing poor bonding at the box joint.

Note that the interval between the first crease ruled line 33 and the second crease ruled line 34 described above is equal to the thickness when the double-sided corrugated cardboard sheet 21 is folded 180 degrees, and the second vertically folded crease ruled line 31 and As a supplement to the point that the fourth vertically folded crease ruled line 32 can be folded correctly,
According to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The B flute has a stepped pitch 26 of 6.0 mm and the thickness when the sheet is folded 180 degrees is the same as 6.0 mm, and the E flute has a stepped pitch 26 of 3.2 mm and the sheet is folded 180 degrees. The thickness at the time is the same as 3.2 mm.
So, for B flute and E flute,
The back-cutting method uses a line-contact type round ruler member, and the interval dimension 43 seen from the center of the first ruler member and the second ruler member is equal to the interval of the stepped pitch 26. Set with
In the surface punching method, the width 552 of the groove groove of the face plate 5 is set at an interval equal to the interval of the stepped pitch 26,
The interval between the first crease ruled line 33 and the second crease ruled line 34 was set to be equal to the thickness when the double-sided cardboard sheet 21 was folded 180 degrees.

And as shown in Table 1 above,
The flute step pitch 26 of A flute is 8.8mm and the thickness when the sheet is folded 180 degrees is 10mm, so there is a difference of 1.2mm,
The step pitch 26 of C flute is 7.5 mm and the thickness when the sheet is folded 180 degrees is 8.0 mm, so there is a difference of 0.5 mm.
So, for A flute and C flute,
In the back-cutting method, the A flute is about 0.6 mm which is half of the difference of 1.2 mm, and the C flute is about 0.25 mm which is half of the difference of 0.5 mm. It is necessary to set a square contact ruler of the surface contact type, and the interval 43 as viewed from the center of the first ruler member and the second ruler member is equal to the interval of the step pitch 26. The distance between the first crease ruled line 33 and the second crease ruled line 34 is set to the thickness when the double-sided corrugated cardboard sheet 21 is folded by 180 degrees. The intervals were almost equal.
With respect to the A flute and C flute of the surface punching method, the difference of 1.2 mm and 0.5 mm cannot be completely accommodated.

In the present invention, exceptional reinforced corrugated cardboard sheets other than the standard of the double-sided corrugated cardboard sheet shown above may be appropriately adjusted in consideration of the crushed thickness of the sheet.

In the present invention, the face plate 5 having the convex stripes 51 and the concave groove stripes 55 is exemplified by a tape stripe, but the face plate 5 may be a CAD face plate.

In the present invention, the ruled member group 44 is formed by three ruled members of the left ruled member 441, the right ruled member 442, and the central ruled member 443. As shown in FIG. The ruled member group 44 may be formed in a shape such as integral molding or a ruled line.

In the backside punching method of the present invention, the base width 52 of the face plate is wider than the interval dimension 43 as seen from the center of the first ruled member and the second ruled member. The base width 52 of the face plate may correspond to a width narrower than the inner dimension of the first ruled member 41 and the second ruled member 42.

DESCRIPTION OF SYMBOLS 1 Thomson type 21 Double-sided corrugated cardboard sheet 22 Blank sheet 23 Elongation allowance part 24 Y-shaped relief 25 Second buckling 26 Stepped pitch 261 Step top 262 Step valley 263 The middle 31 The second vertical folding crease ruled line 32 The fourth vertical folding Crease ruled line 33 First crease ruled line 34 Second crease ruled line 41 First ruled line member 42 Second ruled line member 43 Distance dimension 44 viewed from the center of the first ruled line member and the second ruled line member 44 Ruled member group 441 Left ruled member 442 Right ruled member 443 Central ruled member 5 Face plate 51 ridge 52 Face plate base width 53 Face plate thickness 531 Base plate thickness 532 ridge height 54 ridge width 55 Concave groove 551 Concave groove edge 552 Concave groove width 6 Cutlery 7 Pair of upper and lower feed belts 8 Wide holding belt

Further, as shown in FIG. 10, the double-sided corrugated cardboard sheet 21 has a stepped pitch 26 with a constant interval, and the second longitudinal crease crease 31 and the fourth longitudinal crease crease if the design dimensions of the box change. The position of the vertical folding ruled line of the ruled line 32 changes,
For example, in the punching method by back-cutting, the second vertical folding ruler member and the fourth vertical folding ruler member of the well-known Thomson type 1 are respectively connected to two parallel first ruler members 41 and second pressurizing members. If the ruled member 42 is formed with an appropriate width,
As shown by b and c in FIG. 2, the consistency between the center 43 of the first ruled member and the center of the second ruled member 43 and the stepped pitch 26 of the double-sided corrugated cardboard sheet 21 to be punched I can't take it,
The positions of crushing the steps of the double-sided corrugated cardboard sheet 21 of the first ruled member 41 and the second ruled member 42 are different from the step top 261, step 262, and the middle 263, respectively.
As a matter of course, the crushed shapes of the first crease ruled lines 33 and the second crease ruled lines 34 formed on the blank sheet 22 are different from each other, and the first crease ruled lines 33 and 33 are different from each other. Folding at the second crease ruled line 34 varies, and if the blank sheet 22 is glued together in this state, poor bonding of the box such as the fishtail or the second buckling 25 occurs, and a box with high accuracy cannot be manufactured. .

As means for solving the above problems, the punching method according to the present invention is:
In the punching method by double-sided corrugated cardboard sheet 21 using the Thomson mold 1 to obtain a blank sheet 22 capable of folding the second vertically folded crease ruled line 31 and the fourth vertically folded crease ruled line 32 in the corrugated cardboard box exactly 180 degrees, The second longitudinally folded ruler member and the fourth longitudinally folded ruler member in the parallel direction along the step of the double-sided corrugated cardboard sheet 21 provided in the Thomson mold 1 are respectively divided into two parallel first ruler members 41 and Each of the two ruled members 42,
The base width 52 of the face plate to be stuck on the cutting plate is wider than the interval between the first ruled member 41 and the second ruled member 42,
The face plate 5 has a shape having a ridge 51 for forming the extension allowance 23 at a position facing the middle between the first ruled member 41 and the second ruled member 42,
That the punching method characterized by centering and spacing equal to the spacing of the corrugation pitch 26 of the corrugated fiberboard sheet 21 a distance dimension 43 of the center of the second押罫member, punched the first押罫member It is.

Note that the interval between the first crease ruled line 33 and the second crease ruled line 34 described above is equal to the thickness when the double-sided corrugated cardboard sheet 21 is folded 180 degrees, and the second vertically folded crease ruled line 31 and As a supplement to the point that the fourth vertically folded crease ruled line 32 can be folded correctly,
According to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The B flute has a stepped pitch 26 of 6.0 mm and the thickness when the sheet is folded 180 degrees is the same as 6.0 mm, and the E flute has a stepped pitch 26 of 3.2 mm and the sheet is folded 180 degrees. The thickness at the time is the same as 3.2 mm.
So for B Flute and E Flute,
In the back-cutting method, a line-contact type round ruler member is used, and a distance dimension 43 between the center of the first ruler member and the center of the second ruler member is equal to the interval of the stepped pitch 26. Set by interval,
In the surface punching method, the width 552 of the groove groove of the face plate 5 is set at an interval equal to the interval of the stepped pitch 26,
The interval between the first crease ruled line 33 and the second crease ruled line 34 was set to be equal to the thickness when the double-sided cardboard sheet 21 was folded 180 degrees.

And according to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The flute step pitch 26 of A flute is 8.8mm and the thickness when the sheet is folded 180 degrees is 10mm, so there is a difference of 1.2mm,
The step pitch 26 of C flute is 7.5 mm and the thickness when the sheet is folded 180 degrees is 8.0 mm, so there is a difference of 0.5 mm.
So for A flute and C flute,
In the back-cutting method, the A flute is about 0.6 mm which is half of the difference of 1.2 mm, and the C flute is about 0.25 mm which is half of the difference of 0.5 mm. It must be set, using a square押罫member surface contact type, the spacing dimension 43 of the center and the center of the second押罫member of the first押罫member, equal to the spacing of the corrugation pitch 26 The distance between the first crease ruled line 33 and the second crease ruled line 34 is set by an interval to complement the difference of 1.2 mm and 0.5 mm, and the thickness when the double-sided cardboard sheet 21 is folded 180 degrees. The interval was almost equal.
With respect to the A flute and C flute of the surface punching method, the difference of 1.2 mm and 0.5 mm cannot be completely accommodated.

It is the schematic which shows the outline concerning embodiment of this invention. a shows the punching method of the double-sided corrugated cardboard sheet according to the present invention, and b shows the punching method of the double-sided cardboard sheet according to the present invention. It is the schematic which showed the relationship of the space | interval dimension of the step pitch of the double-sided corrugated-cardboard sheet | seat by the back side in this invention, the center of a 1st ruled member, and the center of a 2nd ruled member . a illustrates the state of the present invention where the relationship is equally spaced, and b and c illustrate the state where the relationship is not consistent. It is the schematic which showed the relationship between the step pitch of the double-sided corrugated-cardboard sheet | seat by front removal in this invention, and the width of a ditch | groove groove | channel. a illustrates the state of the present invention where the relationship is equally spaced, and b and c illustrate the state where the relationship is not consistent. It is the schematic which showed the process of folding of the crease ruled line in the gluer process of the blank sheet | seat obtained with the punching method in this invention, and a, b, and c showed the blank sheet from the side. a shows a blank sheet obtained by the punching method according to the present invention, and b shows a Y-shape on the inner side of the blank sheet when the crease ruled line on which the blank sheet comes inward in the gluer process is first folded at 90 degrees. FIG. 3C shows that one side of the relief is formed, and c indicates that the crease ruled line which is on the outside in the gluer process is folded at 90 degrees to form the other side of the Y-shaped relief on the inside of the blank sheet. It shows that a Y-shaped relief is formed in the blank sheet folded every time, and an enlarged schematic view of the vicinity of the Y-shaped relief. The blank sheet obtained by the punching method in the present invention and a partially enlarged view are shown in a front view. It is the schematic which shows the outline of the face plate used with the punching method by the back side of the double-sided cardboard sheet | seat in this invention. It is the schematic which shows the outline of the face plate used with the punching method by the front punching of the double-sided cardboard sheet | seat in this invention. It is the schematic which expanded and illustrated especially the 1st crease ruled line, the 2nd crease ruled line, and the expansion margin part vicinity of the blank sheet obtained by the punching method by the back side of the double-sided corrugated cardboard sheet in this invention. Since the blank sheet obtained by the punching method in the present invention starts to be folded from the crease ruled side which comes inward in the gluer process, it is first folded from the first crease ruled line in the gluer process at a, and then the second crease. The movement of folding the ruled line is indicated by an arrow, and in b, the first crease ruled line is folded by the first lure process in the gluer process, and then the movement of folding the first crease ruled line is indicated by an arrow. It is the schematic which expanded and illustrated especially the 1st crease ruled line, the 2nd crease ruled line, and the expansion margin vicinity of the blank sheet obtained by the punching method by the front punching of the double-sided cardboard sheet in the present invention. Since the blank sheet obtained by the punching method in the present invention starts to be folded from the crease ruled side which comes inward in the gluer process, it is first folded from the first crease ruled line in the gluer process at a, and then the second crease. The movement of folding the ruled line is indicated by an arrow, and in b, the first crease ruled line is folded by the first lure process in the gluer process, and then the movement of folding the first crease ruled line is indicated by an arrow. It is the schematic showing the step pitch, step top, step valley, and the middle in a double-sided cardboard sheet. It is the schematic which shows the outline in the gluer process of the blank sheet obtained by the punching method in this invention. It is the schematic which shows the outline of the ruled member group of shapes, such as integral molding and a ruled line. It is the schematic which shows the outline of the box which the fishtail generate | occur | produced. It is the schematic which shows the outline of the blank sheet which the 2nd buckling generate | occur | produced.

As shown in FIG. 1 a and FIG. 2, the reverse punching method is the Thomson die 1 in which the first vertical folding ruler member and the second vertical folding ruler member are arranged in parallel with each other. constitute a押罫member 41 in the second押罫member 42, flute tip pitch 26 of the corrugated fiberboard sheet 21 a distance dimension 43 of the center and the center of the second押罫member of said first押罫member, punched The interval is equal to the interval.

Note that the interval between the first crease ruled line 33 and the second crease ruled line 34 described above is equal to the thickness when the double-sided corrugated cardboard sheet 21 is folded 180 degrees, and the second vertically folded crease ruled line 31 and As a supplement to the point that the fourth vertically folded crease ruled line 32 can be folded correctly,
According to the standard of the double-sided cardboard sheet 21 shown in Table 1,
The B flute has a stepped pitch 26 of 6.0 mm and the thickness when the sheet is folded 180 degrees is the same as 6.0 mm, and the E flute has a stepped pitch 26 of 3.2 mm and the sheet is folded 180 degrees. The thickness at the time is the same as 3.2 mm.
So, for B flute and E flute,
Use round押罫member of the line contact type is back punching method, a spacing dimension 43 of the center and the center of the second押罫member of the first押罫member, equal to the spacing of the corrugation pitch 26 Set by interval,
In the surface punching method, the width 552 of the groove groove of the face plate 5 is set at an interval equal to the interval of the stepped pitch 26,
The interval between the first crease ruled line 33 and the second crease ruled line 34 was set to be equal to the thickness when the double-sided cardboard sheet 21 was folded 180 degrees.

And as shown in Table 1 above,
The flute step pitch 26 of A flute is 8.8mm and the thickness when the sheet is folded 180 degrees is 10mm, so there is a difference of 1.2mm,
The step pitch 26 of C flute is 7.5 mm and the thickness when the sheet is folded 180 degrees is 8.0 mm, so there is a difference of 0.5 mm.
So, for A flute and C flute,
In the back-cutting method, the A flute is about 0.6 mm which is half of the difference of 1.2 mm, and the C flute is about 0.25 mm which is half of the difference of 0.5 mm. It must be set, using a square押罫member surface contact type, the spacing dimension 43 of the center and the center of the second押罫member of the first押罫member, equal to the spacing of the corrugation pitch 26 The distance between the first crease ruled line 33 and the second crease ruled line 34 is set by an interval to complement the difference of 1.2 mm and 0.5 mm, and the thickness when the double-sided cardboard sheet 21 is folded 180 degrees. The interval was almost equal.
With respect to the A flute and C flute of the surface punching method, the difference of 1.2 mm and 0.5 mm cannot be completely accommodated.

In the backside punching method of the present invention, the base width 52 of the face plate is wider than the interval dimension 43 between the center of the first ruled member and the center of the second ruled member. The base width 52 of the face plate may correspond to a width narrower than the inner dimension of the first ruled member 41 and the second ruled member 42.

DESCRIPTION OF SYMBOLS 1 Thomson type 21 Double-sided corrugated cardboard sheet 22 Blank sheet 23 Elongation allowance part 24 Y-shaped relief 25 Second buckling 26 Stepped pitch 261 Step top 262 Step valley 263 The middle 31 The second vertical folding crease ruled line 32 The fourth vertical folding Crease ruled line 33 First crease ruled line 34 Second crease ruled line 41 First ruled member 42 Second ruled member 43 Distance dimension 44 between the center of the first ruled member and the center of the second ruled member 44 Ruled member group 441 Left ruled member 442 Right ruled member 443 Central ruled member 5 Face plate 51 ridge 52 Face plate base width 53 Face plate thickness 531 Base plate thickness 532 ridge height 54 ridge width 55 Concave groove 551 Concave groove edge 552 Concave groove width 6 Cutlery 7 Pair of upper and lower feed belts 8 Wide holding belt

Claims (2)

Both sides provided in the Thomson mold in the punching method by double-sided corrugated cardboard sheet using the Thomson mold to obtain a blank sheet capable of folding the second longitudinal crease crease and the fourth longitudinal crease crease in the corrugated cardboard box exactly 180 degrees A second vertically folded ruled member and a fourth vertically folded ruled member in parallel direction are formed by two parallel first ruled members and second ruled members, respectively, along the steps of the cardboard sheet. And
The base width of the face plate to be attached on the cutting plate is wider than the interval between the first ruled member and the second ruled member,
The face plate has a shape having a ridge for forming an extension margin at a position facing the middle between the first ruled member and the second ruled member,
A punching method, characterized in that an interval dimension viewed from the center of each of the first ruled member and the second ruled member is set to an interval equal to an interval of a stepped pitch of a double-sided corrugated cardboard sheet. In a punching method by front-cutting a double-sided cardboard sheet using a Thomson type to obtain a blank sheet capable of folding the second vertical crease crease ruled line and the fourth vertical fold crease ruled line in a corrugated cardboard box exactly 180 degrees, a face plate is placed on the cutting plate. A face plate having a groove with a groove of 0.7 to 1.5 mm is attached,
A second vertical folding ruler member and a fourth vertical folding ruler member provided in a parallel direction along the step of the double-sided corrugated cardboard sheet provided in the Thomson type are provided with a left ruler member and a right ruler member. Each of the ruled member groups formed of three ruled members each having a central ruled member whose height dimension is set higher than that of the left ruled member and the right ruled member in order to form an extension allowance portion. Forming,
The groove is provided at a position facing the ruled member group,
A punching method, characterized in that the width of the groove is equal to the stepped pitch interval of the double-sided corrugated cardboard sheet.