JP2010029975A - Break line structure of punching blade for carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a cut shape that can be opened according to a predetermined planned breaking line even when a carton is opened by a change in shear stress that deviates from the zipper line due to individual differences of users or changes in the holding state of a carton. Cut row structure of punching blades with excellent performance and economy.
SOLUTION: A straight base cutting edge formed by a cutting edge portion of one long punching blade, and a slanted branch cutting portion that is connected to the straight base cutting edge and opens the cutting edge portion and bends in one direction. A flange-shaped cutting blade portion formed by a blade, a linear base cutting blade formed by the other long punching blade adjacent in parallel with the blade tip portion, and connected to the linear base cutting blade; A scissors-shaped cutting edge portion formed by obliquely branching edge cutting blades that are opened by cutting the blade edge portion and bent in a direction opposite to the one long punching blade is provided at the same pitch, A cut row structure of a punching blade for a carton that forms a substantially Y-shaped cut row by combining the cut blade portions.
[Selection] Figure 5

Description

  TECHNICAL FIELD The present invention relates to a cut line structure of a punching blade for a carton relating to a zipper (breaking line for breaking) used for opening a carton, among packaging paper container structures.

Conventionally, in a so-called sealed end carton in which a paper box having a folding cylindrical structure called a carton is used, and both ends of a cylindrical body are glued and closed in a so-called sealed end carton. When opening the body portion, a predetermined cutting portion of the paper box is preliminarily provided with a cutting blade structure portion that is interrupted to be a portion to be broken, and in use, the portion to be broken is broken and opened. As the row structure portion, a perforation structure with intermittent cutting blades and a zipper structure with a saddle-like cut row in which cutting edges whose ends are bent in a bowl shape are used are often used.
A conventional carton H shown in FIG. 7 includes a zipper strip 114 formed between intermittent saddle-like cut rows J and J ′ that cross the front plate 102 of the cylindrical body in parallel, and the zipper strip 114. The perforated perforations N and N (not shown in the figure) drilled obliquely across the body left and right side plates 101 and 103 (not shown in the figure) from both ends of the upper side of the back plate 104 (not shown in the figure) 1 shows a carton having a lid structure that opens and closes in a folding manner with a hinge portion formed by a broken line provided at a fulcrum as a fulcrum, and constitutes a zipper strip 114 that crosses the front plate 102 in parallel in the carton H The saddle-like cut line J, J ′ is composed of parallel straight portions and hatched portions in which the end portions on the opening start side of the respective straight portions are bent in a hook shape toward the opposite side (inner side) of the parallel lines. Yes.
The cutting blade is a strip-shaped steel plate having a thickness of 0.7 mm and a width of 23.6 mm, in which a side edge on one side is a blade tip part and a side edge on the opposite side is an embedded part so as to form a carton cutting line. In accordance with the above, it constitutes a part of a punching die that is cut and bent and embedded in a laminated plywood (base plate), and in a carton punching process, , And a face plate (a press plate or the like on a metal plate to make the punching die a male die and a female die for this, sometimes called a counter plate) is attached to the punching machine. After inserting a paperboard or the like between the two, instantaneous pressure processing is performed and punching is performed. The folding line portion used for folding the carton is also incorporated into a part of the punching die by applying the same processing to a ruled blade formed of a strip-shaped steel plate having no cutting edge.
The punching machines used for punching cartons and the like are generally classified into a flat pressure type and a rotary type. In the case of the rotary type, both the punching die and the face plate are processed into a cylindrical shape, and there are advantages such as relatively long die life, good punching accuracy, and no preparation time. It is expensive and can only be used in products (cartons) that are in bulk and long-term. On the other hand, the flat pressure type has versatility and has been widely used.
The punching die used in the flat pressure punching machine is usually a laser beam that follows the carton blank drawing or is output in accordance with the digital data of the carton blank drawing. A groove-shaped sculpture is applied, and a punching blade, a crease-pressing blade or the like made of the bent strip-shaped steel plate is embedded in the groove and fixed.

The zipper strip 114 in the carton H shown in FIG. 7, that is, the operation of the strip opening portion by intermittently connecting the hook-shaped cutting blade portion parallel to the straight portion, picks the grip portion provided at the corner of the carton body portion. The zigzag line, that is, the extending direction of the linear portion of the saddle-shaped cut lines J and J ′ crossing the front plate 102 is moved as the opening direction, and the zipper strip 114 is pulled up, so that the shear stress in the moving direction is parallel. A tearing break from the end of each straight line inward to the moving direction occurs due to the inward shearing stress from the end of each straight line to the zipper band, and the hatched part of each of the next scissor-like incisions Reach the cut. By continuing this operation, the zipper part is broken and the opening operation is performed. However, if the direction of opening is deflected due to the situation such as holding the carton or individual differences in operation method, the continuation of the break due to the above operation will not be performed correctly, and the zipper line from the end of the straight line part to the hatched part It will come off and breakage will occur other than the planned breakage, causing delamination and partial peeling of the print, detracting from aesthetics, obstructing the necessary display area, and using the zipper part in the middle There was a fear that it would be broken.
Also, the zipper line indicates the direction of the paper pattern of the carton (the direction of the paper fibers formed when making the paperboard used in the carton, such as coated cardboard, etc. If it is slanted or has a curved line, it tends to break in the direction in which the used paperboard is easily torn, that is, the direction of the paper, Problems were particularly likely to occur. In the case of a paperboard such as a coated ball having a basis weight of 160 g / m ² or more which is usually used for a carton, since 5-6 layers of paperboard are made at the time of paperboard making, the tear is removed from the place where the zipper line is removed. The delamination is likely to spread.

In order to solve the above problem, a zipper punching line has been proposed in which the cut shape of the zipper portion is formed in a Y-shape and the opening region can be opened according to the zipper line (for example, Patent Document 1). That is, in what was shown by patent document 1, the shape which received the tearing fracture | rupture from the linear part terminal end of a zipper line in the oblique line part conventionally arrange | positioned with a saddle-shaped cut | interruption is symmetrical with respect to the extended line of a linear part. By receiving at the V-shaped end that is open at the top, even if the opening direction is deflected, it can be received at either of the hatched portions of the V-shaped end, and the fracture continues at the straight line portion that continues to the hatched portion. Is.
Japanese Patent Laid-Open No. 10-296883

In the zipper punching die according to the invention disclosed in Patent Document 1, the cut line of the punching blades forming the Y-shaped zipper is shown in FIGS. 3A and 3B, although a detailed configuration will be described later. As described above, the long punching blade B-1 having the same bowl-shaped cutting edge portion as that of the conventional type continuously on one side and the short cutting edge portion corresponding to one oblique line portion of the Y-shape are continuously provided on one side. Both of the long punching blades B-2 to be formed are finished by embedding them in a base plate at a predetermined interval with the strip portions parallel to each other as shown in the plan view of FIG. In addition, as shown in FIG.3 (b), the side edges D-1 and D-2 on the opposite side to the cutting blade part of a punching blade are embedding parts.
Of the cut lines of the above-mentioned punching blades, the long punching blade B-2 forms a short cutting blade portion corresponding to one Y-shaped hatched portion, and embeds a cutting blade having only the hatched portion as in the prior art. It is said that it is durable against things and can be prevented from falling off the base plate. However, it requires a processing time for forming a stepped portion E-1 that leaves only the cutting edge portion and prevents the other belt-like portions from popping out, and is economical in that the cost increases. There is a problem with sex. Furthermore, the shaded part cutting blade C-3 formed by the long punching blade B-2 is integrally continuous with the straight part cutting blade C-1 formed by the other long punching blade B-1. Therefore, for example, when a large amount of punching causes movement such as bending of a short cutting edge portion over time, the zipper line may not continue to break.
From the above, there is a demand for a zipper style that has a punching die with a punching blade configuration that is excellent in workability and that can reduce the processing time and that does not impair the continuity of breakage due to the zipper line.

  Accordingly, an object of the present invention is to solve the above-described problem, and in the partial opening of a carton, an opening that is out of the zipper line caused by individual differences among users or changes in the holding state of the carton is provided. With the structure of the punching blade that can form the cut line shape that can be opened according to the predetermined planned breaking line in the carton even if the direction changes, the processing time can be shortened by its excellent workability, Another object of the present invention is to provide a durable punching blade structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a cut line structure formed by a punching blade for a carton in which one side edge of a strip-shaped steel plate is a blade edge part and the opposite side edge is an embedded part. A straight base cutting edge formed by the cutting edge of one of the long punching blades, and a slanted branch cutting edge connected to the linear base cutting edge and opening the cutting edge and bending it in one direction. The other long punching blade is formed and has a hook-shaped cutting blade portion formed at the predetermined pitch with the slanted branch cutting edge as the opening start side, and is adjacent to and parallel to the one long punching blade. A straight base cutting edge formed by the cutting edge portion of the blade, and a slanted branch cutting blade which is connected to the linear base cutting blade and opens the cutting edge portion and is bent in a direction opposite to the one long punching blade. With the oblique branch cutting edge as the opening start side. The hook-shaped cutting edge portions are provided at the same pitch as the one long punching blade, and a substantially Y-shaped cut row is formed by the hook-shaped cutting blade portions of the long punching blades adjacent to each other. A cut line structure of a punching blade for a carton. By constructing in this way, the oblique branch cuts that have received the break from the end of the cut row continue to the straight base cuts, causing problems such as delamination due to deviations at the discontinuous parts. In addition, the conventional Y-shaped punched-blade cut line structure, which required processing time in the manufacture of punching dies and was economically problematic, has good workability and adjustment. Can be reduced, and the cost is reduced by shortening the processing and adjustment time, and at the same time, the wear of the short cutting edge portion forming the conventional Y-shaped cut line is not generated, and the paperboard By applying to a carton made of a product, it is possible to open at a predetermined planned breaking line.

  The invention according to claim 2 is a surface in which each of the punching blades constituting the substantially Y-shaped cut row is a single-cutting blade and the straight base portion has no cutting edge in the straight base cutting blade portion. The oblique line structure of the cut line structure of the punching blade for carton according to claim 1, wherein the cut line structure is formed by adhering each other to each other, as in the first aspect of the invention. The part cut continues continuously to the straight base cut, and does not cause problems such as delamination due to deviation at the discontinuous part, and also such as delamination due to the gap between the close linear base cutting edges There is no occurrence, and it does not impair the appearance.

  The invention according to claim 3 is characterized in that the substantially Y-shaped cut rows are provided in parallel at a predetermined interval, and a zipper belt portion is formed between both the substantially Y-shaped cut rows. The zipper belt portion can be formed by the cut row structure of the substantially Y-shaped punching blade having good workability in the cut row structure of the punching blade for carton according to any one of 1 and 2. When opening the zipper, the tear direction is easy to follow the zipper line, and the zipper strip can be prevented from tearing.The zipper has an excellent opening and has good workability. The cost can be reduced by shortening the processing and adjustment time.

  According to a fourth aspect of the present invention, there is provided a linear base cutting blade formed by a cutting edge portion of a long punching blade in parallel with a predetermined interval with respect to the substantially Y-shaped cut row, and the linear shape The hook-shaped cutting edge portion is formed by a slanted branch cutting edge that is connected to the base cutting edge and that opens and cuts the blade edge portion in one direction. A saddle-shaped cut line provided at the same pitch as the letter-shaped cut line is provided, and a zipper belt portion is formed between the substantially Y-shaped cut line and the hook-shaped cut line. 3. A cut line structure of a punching blade for a carton according to any one of items 1 and 2, which is used for a punching die in the zipper strip opening obliquely traversing the carton body constituting plate according to the above configuration. Because some punching blades can be omitted, the cost of punching dies is reduced. It becomes possible, in the opening portion of obliquely crossing of the carton can be easily opened by a continuous break.

  The invention according to claim 5 is characterized in that the substantially Y-shaped cut row is arranged in a curved shape in the entire length or in a partial section. By configuring in this way with the cut line structure of the blades, it is possible to easily open the curved opening part of the carton even by continuous breakage.

  The cut row structure of the punching blades for carton of the present invention is such that the unsealed breaking portion has a linear base cutting blade that is adjacent and parallel to each other, and opposite sides from the same side end of the parallel linear base cutting blade. From the opening start end side by forming a substantially Y-shaped cut row by continuously disposing each hook-shaped cutting blade portion that is formed by a slanted branch cutting blade that is bent linearly and extended Can be easily received by the Y-shaped oblique branch cutting edge, and the continuous opening to the substantially Y-shape to be arranged next can be easily propagated. Compared to a zipper, the punching die can be manufactured easily, and the processing time can be shortened, and the cost can be reduced due to the reduction of the time for adjustment.

  A straight base cutting edge that is formed in a substantially Y shape and is parallel to each other, and a diagonal branch cutting edge that is bent from one end of the linear base cutting edge and linearly extends is formed integrally with each other. This is because, among the zipper parts formed from the conventional Y-shaped cut row, the short diagonal branch cutting edge on one side of the head is not formed to be connected to the straight base cutting edge. There is no wear such as dropout, it is more durable, and due to a large amount of punching processing, the short oblique branch cutting edge is not continuous with the straight base cutting edge due to partial movement etc., and the breakage is discontinuous Such a thing does not occur.

  Further, the punching blades constituting the substantially Y-shaped cut line are respectively formed by using the punching blades of the single cutting blades and bringing the surfaces of the single cutting blades having no cutting edges into close contact with each other at the linear base cutting blade portion. Thus, there is no gap between the intimate linear base cutting edges, no delamination between the cutting edges, and the appearance is not impaired.

  The present invention will be described in detail below with reference to the drawings. FIG. 1A is a developed plan view showing a blank state of a carton according to an embodiment in which a zipper belt is provided using the cut line structure of the punching blade for a carton according to the present invention. FIG. 1B is a perspective view for explaining the carton of the embodiment. FIG.1 (c) is the perspective view for description which shows the opening display state of the carton of an Example similarly. Fig.2 (a) is an enlarged plan view for description of the zipper belt part by the conventional hook-shaped cut row. FIG.2 (b) is an enlarged plan view for description of the zipper belt part by the conventional Y-shaped cut line. Fig.3 (a) is a top view for description which shows the punching blade structure of the conventional Y-shaped cut line. FIG.3 (b) is a perspective view for description which shows the punching blade structure of the conventional Y-shaped cut line similarly. FIG. 4A is an explanatory plan view showing another punching blade configuration of a conventional Y-shaped cut row. FIG.4 (b) is a perspective view for description which shows another punching blade structure of the conventional Y-shaped cut line. FIG. 5A is an explanatory plan view showing the configuration of the punching blade of the substantially Y-shaped cut row according to the present invention. FIG.5 (b) is a perspective view for description which shows the structure of the punching blade of the substantially Y-shaped cut line which similarly concerns on this invention. FIG. 6A is an explanatory perspective view showing another development example of a carton provided with a zipper band using the cut line structure of the punching blade for carton according to the present invention. FIG. 6B is an explanatory perspective view showing still another development example of the carton using the cut line structure of the punching blade for carton according to the present invention. FIG. 6C is an explanatory perspective view showing still another development example of a carton in which a zipper band is arranged using the cut line structure of the punching blade for carton according to the present invention. FIG. 7 is a perspective view for explaining a carton using a zipper strip made of a conventional saddle-shaped cut line. FIG. 8A is an explanatory partial side view showing typical types and shapes of punching blades. FIG. 8B is an explanatory perspective view showing a configuration in which a single cutting edge is used in a substantially Y-shaped cut row according to the present invention.

  FIG. 1A is a developed plan view showing a blank state of a carton according to an embodiment in which a zipper belt is provided using the cut line structure of the punching blade for a carton according to the present invention, and punching a sheet material such as paperboard The blank P formed by processing is formed by connecting a sticking plate 5, a left side plate 1, a front plate 2, a right side plate 3, and a back plate 4 in this order via folding lines L1, L2, L3, and L4. A top plate 6 and an insertion plate 7 are connected in order on the upper extension of 1 via folding lines L5 and L6, and on the upper extension of the front plate 2 and the back plate 4 via folding lines L7 and L8, respectively. Ear pieces 8 and 9 are extended, respectively, on the lower extensions of the left side plate 1, front plate 2, right side plate 3, and back plate 4, respectively, via bottom lines L 9, L 10, L 11 and L 12. 10, 11, 12, and 13 are extended. In parallel with a predetermined distance from the lower end side of the front plate 2, strip-like zippers 14 made of two ridge-like cut lines J and J 'are engraved from the center toward the left and right side plates, respectively. The saddle-like cut rows J and J ′ forming the belt-like zipper 14 reach the left and right side plates 1 and 3, and the straight base portion cutting blades parallel to each other and incline obliquely upward from the corner portions. Formed into a substantially Y-shaped cut row K, K ′ by a saddle-like cut row comprising oblique line-like branch cutting blades extending from opposite ends to the opposite sides from one end of the base-like base cutting blade, Inclined zipper strips 15, 15 formed with the cutting edge as the starting end side are engraved up to the center of the upper side of the left side plate 1 and right side plate 3, respectively. The fold line L5 on the upper side of the left side plate 1 has a cut line M between the intersections with the cut lines K and K ', and a break perforation N between the left end fold line L1 and the bottom component plates 10, 12 Adhering pieces 10 'and 12' are extended from the respective right end corners via folding lines L13 and L14.

  FIG. 1B is an explanatory perspective view of the carton of the embodiment. The bottom component plates 10, 11, 12, 13 are folded in advance using the folding lines L9, L10, L11, L12, and the folding lines L13, L14 are After the folding pieces 10 'and 12' are folded and pasted to the bottom component plates 11 and 13, the folding lines L2 and L4 are folded, the back plate 4 and the pasting plate 5 are pasted, and the carton is folded flat. Is put up, and after filling the contents, the top plate 6 is covered and the insertion plate 7 is inserted to show a state where the assembly is completed. By the way, Carton Q is usually a small carton or bag that stores confectionery, miscellaneous goods, etc., and collects and wraps multiple packages (for example, dozens or 10 units) that can be sold at retail stores. It is a dual-purpose transport carton.

  When opening the carton Q, first, a zipper belt portion 14 made of conventional bowl-shaped cut lines J and J ′ which is engraved at a predetermined distance from the lower end side of the front plate 2 and opened from the center is moved in the left-right direction. Inclined zipper strips 15 and 15 formed by substantially Y-shaped cut rows K and K ′ are connected to the corners on both sides of the torn front plate 2 and are respectively centered at the upper end sides of the left and right side plates 1 and 3. By tearing to the vicinity, then breaking the cut perforation M and the breaking perforation N cut on the upper end side of the left side plate 1, and breaking the breaking perforation L8 on the upper end side of the back plate 4, the correctness of the carton Q The upper portion of the face plate 2 and the front portions of the left and right side face plates 1, 3 and the carton upper portion composed of the top face plate 6 and the ear piece 9 were excised, and the contents X were exposed as shown in FIG. Front plate 2, back plate 4, left and right side plates 1, 3 and bottom structure It is intended to open the display state of substantially tray-like which is formed of a plate.

2 (a) and 2 (b) are enlarged plan views for comparison and explanation of zipper strips using a conventional type of cut line, and in particular, the carton body portion as in the carton of the embodiment shown in FIG. The zipper belt section that crosses diagonally. In the figure, the arrow pointing diagonally to the upper right indicates the opening direction of the zipper, and the arrow pointing in the horizontal bidirectional direction indicates the paper direction of the carton. As is well known, “paper grain” means a state in which paper fibers are lined up in the flow direction of paper making in the paper making process such as paperboard, and the paper has the property that it is easy to tear in this paper direction. is doing.
FIG. 2 (a) is an enlarged plan view for explaining the zipper strip portion by the saddle-like cut row, and the saddle-like cut formed by bending the oblique branch cutting edge as the opening start end side and the straight base cutting edge as the opening end side. The row of cuts that are continuous in the opening direction of the blades face each other inward at a predetermined distance to form a belt-like zipper. For tearing the connecting portion T between successive scissors-like cutting edges, the direction of the shear stress acting on the end S of the straight base cutting edge, as indicated by the scissors-like cutting edge on the upper side in the figure (indicated by dotted arrows) Even if it follows the opening direction, or even if it shows a deviation in the paper grain direction, because the oblique branch cutting edge is present at the position where it is received, tearing propagates to the next cut, but like the bowl-shaped cutting blade on the lower side, If the direction of the shear stress acting on the end S of the straight base cutting edge shows a deviation in the direction of the paper grain, it will not propagate to the next cut, making it impossible to open the zipper band, for example, peeling of paper from the middle part of the zipper And inconveniences such as tearing of the zipper occur.
On the other hand, the zipper belt part by the Y-shaped cut line shown in FIG. 2 (b) is a saddle-shaped cutting edge formed by bending the oblique branch cutting edge as the opening start end side and the linear base cutting edge as the opening end side. A slashed branch cutting edge that is symmetrical to the diagonal branch cutting edge adjacent to the bent portion of the bowl-shaped cutting edge to form a Y-shape, and the hook-shaped cutting blades in a row of cuts continuous in the opening direction are Zipper strips are formed facing each other inward at a predetermined distance. For tearing the joint portion T between successive scissors-like cutting edges, the Y-shape is formed even if the direction of the shear stress (indicated by the dotted arrow) acting on the end S of the straight base cutting edge is biased to the left or right. Since the diagonally branched branch cutting edge to be formed is present at a position where it is received, tearing propagates to the next cut and can be opened along the opening direction.
However, the slanted branch cutting edge symmetrical to the slanted branch cutting edge adjacent to the bent portion of the saddle-shaped cutting blade has to be a partial cutting edge structure, and the fixed angle swing and fixed position It is difficult to stably adjust the adjacent portion U such as movement, and in the extreme case, the continuity of the cutting edge is lost due to the opening of the adjacent portion U or dropping of the cutting edge, so that it can propagate to the next cut. Therefore, opening with a belt-like zipper becomes impossible, and there is a risk that problems such as paper peeling from the zipper middle part and tearing of the zipper will occur.

3A and 3B are an explanatory plan view and an explanatory perspective view showing a configuration of a conventional punching blade of a Y-shaped cut line, and a long punching blade B-1 and a similarly long punching. It consists of blade B-2.
As shown in the lower part of the perspective view of FIG. 3B, the long punching blade B-1 is a straight base cutting blade C- formed on the long punching blade in the same direction as the longitudinal direction of the punching blade. 1 and an oblique branch cutting edge C-2 formed by bending the upper portion of the punching blade at a bent portion F in a predetermined direction with respect to the longitudinal direction of the punching blade while being connected to the linear base cutting blade. The configured bowl-shaped cutting edge portion is provided on the side edge of the punching blade at a predetermined pitch, and the other side edge is an embedded portion D-1 embedded in the punching die. In the plan view of FIG. 3 (a), a state is shown in which a diagonal branch cutting edge C-2 is bent at an angle of approximately 45 degrees to the left from the bent portion at the upper end of the linear base cutting edge C-1. ing.
As shown in the upper perspective view of FIG. 3B, the long punching blade B-2 is formed on the long punching blade in the same direction as the longitudinal direction of the punching blade. The upper portion of the punching blade is bent in a predetermined direction with respect to the longitudinal direction of the punching blade at one end of the stepped portion E-1 having a length substantially equal to the straight base cutting blade C-1 of FIG. The slanted branch cutting edge C-3 formed by bending at the same length as the slanting branch cutting edge C-2 of the long punching blade B-1 and at the same pitch It is provided at the side edge, and the other side edge is an embedded portion D-2 embedded in the punching die. As shown in the plan view of FIG. 3 (a), the long punching blade B-2 is parallel to the long punching blade B-1 and on the left side from the bent portion at the lower end of the stepped portion E-1. The tip of the oblique branch cutting edge C-3 that is bent and formed at an angle of approximately 45 degrees is in a position where it comes into contact with the bent portion at the upper end of the straight base cutting edge C-1 of the long punching blade B-1. By being arranged, the oblique branch cutting edge C-2 connected to the linear base cutting edge C-1 constituting the bowl-shaped cutting edge formed from the long punching blade B-1, The Y-shaped cutting edge part which consists of the slanting branch part cutting edge C-3 formed from this punching blade B-2 is formed.
As described above, when manufacturing the long punching blade B-2, the cutting blade portion does not punch the blank or does not contact the blank surface in the punching process due to the formation of the oblique branch cutting blade C-3. It is necessary to provide the stepped portion E-1, which requires a processing step and a processing time for removing a part of the continuous cutting blade portion existing in the punching blade before processing.

4A and 4B are an explanatory plan view and an explanatory perspective view showing a configuration of another development example of a conventional Y-shaped cut row of punching blades, and a long punching blade B-1 and a plurality of punching blades. And a short punching blade B-3. The configuration of the long punching blade B-1 is the same as in the previous section.
The short punching blade B-3 has a stepped portion E-2 on a slanted branch cutting blade C-4 having a length equal to the slanting branch cutting blade C-2 of the long punching blade B-1. It consists of the longitudinal direction of the punching blade having the length of the embedded portion D-3 plus the length, and in the plan view of FIG. 4A, the linear base cutting blade C-1 of the long punching blade B-1. It is arranged at the position where the tip of the cutting edge C-4 of the short punching blade B-3 is in contact with the bent portion at the upper end at an angle of 45 degrees to the right with respect to the longitudinal direction of the long punching blade B-1. By being provided, the oblique branch cutting edge C-2 connected to the linear base cutting edge C-1 that constitutes the bowl-shaped cutting edge formed from the long punching blade B-1, and the short dimension A Y-shaped punching blade is formed which includes a slanted branch cutting blade C-4 constituting the punching blade B-3.
In the manufacture of the punching blades of the Y-shaped cut row of the above-mentioned another development example, the punching blade B-3 processed into a short size is necessary separately from the long punching blade, and the short punching blade In B-3, it is necessary to provide stepped portions E-2 so that the cutting edge portion does not punch the blank or contact with the blank surface in the punching process, and the continuous cutting edge portion existing in the punching blade before processing is required. Processing steps and processing time except for some parts are required.

FIGS. 5A and 5B are an explanatory plan view and an explanatory perspective view showing the configuration of the punching blades of the substantially Y-shaped cut row according to the present invention. (C) is an explanatory plan view of a substantially Y-shaped cut row.
FIG. 5A is an explanatory plan view showing the configuration of the punching blades of the substantially Y-shaped cut row, and the configuration of the long punching blade B-1 is long as described in FIG. A linear base cutting blade C-1 formed in the same direction as the longitudinal direction of the punching blade, and a punching blade connected to the linear base cutting blade in a predetermined direction with respect to the longitudinal direction of the punching blade Are provided with one side of the punching blade at a predetermined pitch, with a hook-shaped cutting blade portion formed of a slanted branch portion cutting blade C-2 formed by bending the upper portion of the cutting portion F at the bending portion F. The side is an embedded portion D-1 embedded in a punching die. In the plan view, a state is shown in which a diagonal branch cutting edge C-2 is bent at an angle of approximately 45 degrees to the left from the bent portion at the upper end of the linear base cutting edge C-1.
As shown in the upper part of the perspective view of FIG. 5B, the structure of the long punching blade B-4 is a straight base cutting blade formed on the long punching blade in the same direction as the longitudinal direction of the punching blade. C-5 and the upper part of the punching blade connected to the linear base cutting edge and in the direction opposite to the oblique branch cutting edge C-2 of the long punching blade B-1 with respect to the longitudinal direction of the punching blade Is formed on the side of the punching blade at the same pitch as that of the long punching blade B-1. It is provided at the edge, and the other side edge is an embedded portion D-4 embedded in the punching die. As shown in the plan view of FIG. 5 (a), the long punching blade B-1 and the long punching blade B-4 are disposed in close proximity or in close proximity to each other at the same pitch. Is a back-to-back saddle-shaped cutting edge formed by the straight base cutting edge C-1 and the oblique branch cutting edge C-2, and the linear base cutting edge C-5 and the oblique branch cutting edge C-6, respectively. A substantially Y-shaped punching blade is formed.

FIG. 5C is a plan view for explaining the substantially Y-shaped cut row according to the present invention, and the cut formed in the substantially Y-shape is a straight base cutting edge C− as described in the previous section. With a substantially Y-shaped punching blade by a back-to-back saddle-shaped cutting edge formed by 1 and a diagonal branch cutting edge C-2, a straight base cutting edge C-5 and a diagonal branch cutting edge C-6 The angle α formed by one hook-shaped cut portion, that is, the straight base cut and the oblique branch cut extending linearly from one end of the straight base cut is 95 ° to It is preferably in the range of 165 °, desirably 135 ° to 150 °. The length γ of the linear base cut is preferably in the range of 1 to 4 times, preferably 2 with respect to the shortest distance β from the end G of the straight base cut to the next oblique branch cut. ~ 3 times.
If the angle α is too small or the shortest distance β is too large, the shearing from the end G of the straight base cut is difficult to be received by the next oblique branch cut, and tearing does not continue. If it is too large or the shortest distance β is too small, tearing resistance is reduced and it is easy to open, but there is a disadvantage that the surface of the carton component plate itself is weakened at the part where the cut is provided, so within the above range. Therefore, it is necessary to design a zipper with a combination of a good balance between the strength of the component plate surface and the tear resistance.

  FIG. 6A is an explanatory perspective view showing another embodiment of a carton in which a zipper belt is arranged using the cut line structure of the punching blade for carton according to the present invention, and the configuration of the carton R is as described above. 1 is substantially the same as the carton Q in FIG. 1, and the zipper strips 14 formed of two ridge-like cut lines J and J ′ are respectively left and right from the center in parallel with a predetermined distance from the lower end side of the front plate 2. The saddle-like cut lines J and J ′ which are engraved toward the both side plates and further form the zipper strip 14 reach the left and right side plates 1 and 3, and the saddle-like cut rows J obliquely upward from the corners. Similarly, the ridge-like cut line J ′ is inclined obliquely upward from the corner and extends in parallel to each other from one end of the parallel base cutting edge and one end of the parallel base cutting edge. Approximately Y-shaped with a ridge-like cut line made up of diagonally shaped branch cutting edges And the inclined zipper strips 15 'and 15' comprising the hook-shaped cut row J and the Y-shaped cut row K 'are respectively formed on the left side plate. 1 and the upper side of the right side plate 3 are engraved up to substantially the center.

When opening the carton R having the above-described configuration, as in the carton illustrated in FIG. 1, a conventional scissor-like cut line J engraved at a predetermined distance from the lower end side of the front plate 2 and opened from the center, The zipper belt portion 14 made of J ′ is torn in the left-right direction to reach each side, and continuously formed with a saddle-shaped cut row J on the upper side and a cut row K ′ according to the present invention having a substantially Y-shaped lower side. Torn to the upper end sides of the left and right side plates 1 and 3, respectively, and then, although not shown in the drawing, a cut M and a broken perforation N carved in the upper end side of the left side plate 1 In addition, by cutting through the broken perforation L8, the ear piece 9 extended to the upper part of the front plate 2 of the carton Q, the front parts of the left and right side plates 1, 3, the top plate 6 and the upper end of the back plate 4 are removed. It is removed and opened to a state where it can be displayed.
As described in the description of the conventional example of the zipper belt portion, as shown in FIGS. 1 and 6, when the zipper belt that obliquely crosses the trunk portion of the carton is provided and the opening direction is obliquely upward, The direction of the shear stress from the end of the cut has individual differences among users, but as shown in FIG. 2 (a), it tends to work relatively toward the paper direction, and the lower side of the zipper band When the cut line is broken, it is not propagated to the next cut and cannot be opened by the zipper band portion, resulting in problems such as paper peeling from the end of the zipper band portion and tearing of the zipper. On the contrary, in the break of the cut line on the upper side of the zipper belt part, even if the direction of the shear stress from the end of each cut constituting the zipper is biased toward the paper grain direction, it tends to easily propagate to the next cut. Thus, as in the inclined zipper band portion 15 ′ of the above-described development example, a zipper band portion in which the upper side cut row is a saddle-like cut row and the lower side cut row is a substantially Y-shaped cut row according to the present invention may be used. The tear propagates to the next cut, and opening along the opening direction becomes possible. With this configuration, a part of the long punching blade used for the punching die can be omitted, so that the cost of the punching die can be further reduced.

  The carton V shown in FIG. 6 (b) is continuous from the upper ends on both sides of the knob formed by parallel vertical lines drilled in the center of the lower end of the front plate 22, and is connected to the front plate 22 via a folding line. In a plane-mounted carton in which a substantially Y-shaped cut row is arranged on both sides of the opening area with the top plate 26, symmetrically in a curved line with the opening direction from the front plate 22 to the top plate 26, A substantially elliptical region extending from the front plate 22 to the top plate 26 is opened by a lifting operation from the knob. In this way, when the carton has a substantially Y-shaped cut line opened in a curved shape, the opening direction changes at each cut, so the direction of the paper and the user's Due to various changes in conditions such as personal differences and carton holding conditions, the zipper line may be disengaged, and the substantially Y-shaped cut using the punching blade structure according to the present invention over the entire cut of the opening part By using the row, opening along the opening direction in a stable and orderly manner is possible.

  The carton W shown in FIG. 6 (c) tears the belt-like zipper portion horizontally traversing the front plate 32 constituting the carton body portion, and then the left and right side plates 31, 33 from the upper ends on both sides of the belt-like zipper (not shown in the drawing). ) Diagonally across the perforation line, and bend at the hinge folding line across the back plate 34 (not shown in the figure) connecting both ends of the perforation line, so that the lid at the top of the carton is It is a so-called hinge-lid carton that lies upside down. When the zipper strip crosses the carton body horizontally as described above, the direction of the shear stress from the end of each incision constituting the zipper is generally horizontal along the paper grain or the zipper is pulled up. It works inward from both ends by the operation and can be torn with a zipper consisting of a conventional saddle-like cut line, but conversely, due to personal differences of the person who uses it and the holding state of the carton, it can deviate from the zipper line Yes, as shown in the figure, if zipper strips having substantially Y-shaped cut lines are used on the upper and lower sides, opening along the opening direction can be performed more stably.

FIG. 8A is an explanatory partial side view showing typical types and shapes of punching blades. FIG. 8 (b) is an explanatory perspective view showing a configuration in which a single cutting blade is used in a substantially Y-shaped cut row according to the present invention. The punching blade used for punching is a paper quality and paper thickness used for carton production. Alternatively, the type to be used is selected from the punching blade shape shown in FIG. 8A depending on the number of production lots, etc., and as shown in FIGS. . The substantially Y-shaped cut line of the punching blade for a carton according to the present invention has a leading edge of each cutting edge when the straight base cutting edge is brought into close contact with each other using a cutting edge of both edges as shown in FIG. A gap of 0.7 mm is generated between the two, and two cuts are punched and formed as shown in the developed plan view and perspective view of FIGS. 1 (a) (b) and 6 (a) (b) (c). The As described above, it is possible to continuously cut in the opening direction by the action of the substantially Y-shaped cut row, but the two cuts in part between the two cuts. Delamination may occur and the appearance may be deteriorated.
The configuration of a substantially Y-shaped punching blade using a single cutting blade (reference numeral is omitted) shown in FIG. 8B is a long base cutting blade, and a straight base cutting blade portion is used. Y-shaped incisions are formed by forming the diagonally-shaped branch cutting edges by bending the ends of the single-cutting blades that have no cutting edges in close contact or in close contact with each other and bending the ends on the same side in opposite directions. This is a structure of a punching blade that forms a row of cuts continuously in the direction of extension of the straight line of the linear base cutting edge. A gap of 0.2 mm is generated between the tips on the design drawing. However, in the actual punching process, the diagonally branched branches are punched into one cut and continuous from one end of the one cut. Partial cuts will be formed, and cutting will So that the free Y-shaped nicks discontinuous portion is formed in the bent portion on tons surface.
With the above configuration, the oblique branch cuts that have received the break from the end of the cut row are continuously continued to the straight base cutting edge, so that the problem of discontinuity of breakage due to the discontinuous portion does not occur. Further, unlike the configuration of a substantially Y-shaped punching blade with a double-blade punching blade, there is no delamination due to the gap between the intimate linear base cutting blades, and the appearance is not impaired.

(A) The expansion | deployment top view which shows the blank state of the carton of the Example by which the zipper strip | belt was arrange | positioned using the notch row structure of the punching blade for cartons concerning this invention. (B) The perspective view for demonstrating the carton of an Example similarly. (C) The explanatory perspective view which similarly shows the unseal | opening display state of the carton of an Example. (A) The expanded plan view for description of the zipper belt | band | zone part by the conventional hook-shaped cut row | line | column. (B) The enlarged plan view for description of the zipper belt part by the conventional Y-shaped cut line. (A) The top view for description which shows the punching blade structure of the conventional Y-shaped cut line. (B) The perspective view for description which shows the punching blade structure of the conventional Y-shaped cut line. (A) The top view for description which shows another punching blade structure of the conventional Y-shaped cut line. (B) The perspective view for description which shows another punching blade structure of the conventional Y-shaped cut line. (A) The top view for description which shows the structure of the punching blade of the substantially Y-shaped cut line which concerns on this invention. (B) The explanatory perspective view which shows the structure of the punching blade of the substantially Y-shaped cut line which concerns on this invention. (C) The top view for description of the substantially Y-shaped cut row which concerns on this invention. (A) The explanatory perspective view which shows the other example of expansion | deployment of the carton in which the zipper belt | belt was arrange | positioned using the notch row structure of the punching blade for cartons concerning this invention. (B) The explanatory perspective view which shows the further another example of expansion | deployment of the carton using the notch row structure of the punching blade for cartons which similarly concerns on this invention. (C) The explanatory perspective view which shows the further another example of expansion | deployment of the carton in which the zipper strip | belt was arrange | positioned using the notch row structure of the punching blade for cartons concerning this invention. The perspective view for description of the carton using the zipper belt | band | zone by the conventional hook-shaped cut line. (A) The explanatory partial side view which shows the typical kind and shape of a punching blade. (B) The explanatory perspective view which shows the structure which used the single cutting blade for the substantially Y-shaped cut line which concerns on this invention.

Explanation of symbols

P Blank Q Carton 1, 31 Left side plate 2, 22, 32 Front plate 3, 23 Right side plate 4 Back plate 5 Adhering plate 6, 26, 36 Top plate 7 Insertion plate 8, 9 Ear piece 10, 11, 12, 13 Bottom component plate 14 Zipper strip portion 15, 15 'Inclined zipper strip portion 101 Left side plate 102 Front plate 106 Top plate 114 Zipper strip portion J, J' ridge-like cut row K, K 'substantially Y-shaped cut row L1-L7 , L9-L14 fold line L8 fold line (break perforation)
M cut line N break perforation S end of straight base cutting edge T connecting part between scissors cutting edge U oblique line branch cutting edge proximity position B-1 to B-4 punching blades C-1, C-5 linear Base cutting edge C-2 to C-4, C-6 Diagonal branch cutting edge D-1 to D-4 Embedding part E-1, E-2 Step part F Bending part G End of straight base part cut α The angle between the straight base cut and the oblique branch cut β The shortest distance between the end of the straight base cut and the oblique branch cut γ The length of the straight base cut H Conventional carton R, V, W Other examples Carton X stored contents

Claims (5)

It is a notch row structure formed by a punching blade for a carton having one side edge of a strip-shaped steel plate as a cutting edge part and the opposite side edge as an embedded part, and is formed by the cutting edge part of one long punching blade. A straight base cutting edge, and a slanted branch cutting edge that is connected to the straight base cutting edge and that cuts the blade tip and bends in one direction. A straight base cutting edge formed by a cutting edge portion of the other long punching blade provided adjacent to and parallel to the one long punching blade. It is formed by a slanted branch cutting edge that is connected to a straight base cutting edge and opens the cutting edge and bends in a direction opposite to the one long punching blade, and opens the slanted branch cutting edge. The side of the bowl-shaped cutting edge is the same as the one long punching blade Provided at a pitch, it cuts column structure of the carton for punching blade and forming a cut rows of substantially Y-shape by a respective hook-shaped cutting edge of the punching blade elongated parallel adjacent. The punching blades constituting the substantially Y-shaped cut line are each formed by a single-cutting blade, and the straight base portion cutting blade portion is formed by closely contacting the surfaces of the single-cutting blade that have no cutting edge. The notch row structure of the punching blade for a carton according to claim 1. 3. The substantially Y-shaped cut row is provided in parallel at a predetermined interval, and a zipper belt portion is formed between both substantially Y-shaped cut rows. Cut line structure of punching blade for carton. In parallel to the substantially Y-shaped cut row at a predetermined interval, a linear base cutting edge formed by a cutting edge portion of a long punching blade, and connected to the linear base cutting blade The cutting edge portion is formed by a slanted branch cutting edge that is opened and bent in one direction, and the hook-shaped cutting edge portion with the slanted branch cutting edge as the opening start side is the same as the substantially Y-shaped cut row. 3. A hook-like cut line provided at a pitch is provided, and a zipper strip is formed between the substantially Y-shaped cut line and the hook-like cut line. The cut line structure of the punching blade for carton described. The cut line structure of the punching blade for a carton according to claim 1, wherein the cut line having a substantially Y shape is arranged in a curved shape with a full length or a partial section.

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