JP2010082716A - Structure of punching blade in punching die for carton blank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a sharp cut line due to a continuous cutting blade of an abutting punching blade, to generate an unnecessary "blade stop" state due to a defect of the punching blade, and to cause "paper peeling, paper curling", etc. There is provided a structure of a punching blade in a punching die of a carton blank score line contact portion, which is free from contamination of the blank front and back surfaces.
A second punching blade crosses and abuts the first punching blade, and an end surface with which the second punching blade comes into contact is chamfered at an angle or shape to cross-contact, and at least the first punching blade has a side face over the entire height. 2 A groove-shaped portion is formed by drilling and forming the width of the surface that the punching blade abuts and the depth of the first punching blade approximately half the thickness and leaving the cutting edge of the cutting blade portion, and the end surface of the second punching blade The structure of the punching blade contact portion in the punching die for a carton blank in which the cutting blade portion of the first punching blade and the cutting blade portion of the second punching blade are made continuous by inserting and abutting into the groove-shaped portion of the first punching blade .
[Selection] Figure 2

Description

  The present invention relates to a punching die used when punching a carton blank of a packaging paper container from a raw material such as paperboard, and more particularly to a structure of a punching blade in a punching die at a contact portion of a carton blank score line. .

Among packaging paper containers, folding boxes (folding cartons, commonly referred to as cartons) and assembly boxes (collapsible boxes, commonly referred to as assembly boxes) that are assembled from blanks that are punched and formed from paperboard or the like are cut into cartons. A strip-shaped steel plate with a thickness of 0.7 mm and a width of 23.6 mm, with one side edge as a cutting edge and the other side edge as an embedding part so as to form a line of sight, is divided and bent according to the carton drawing. The punching blade thus formed is punched and formed by a punching die manufactured by embedding it in a laminated plywood (base plate). The ruled cutting blade that forms the fold line portion used for folding the carton is also formed of a strip-shaped steel plate that does not have a cutting edge portion, and is incorporated into a part of the punching die. In the carton punching process, the punching die incorporated in the base plate and a face plate (a press board or the like on the metal plate are attached to the punching die, and the punching die is a male die and a female die corresponding thereto. Is attached to a punching machine, and a paperboard or the like is inserted between the two and then subjected to punching by instantaneous pressure processing.
There are generally flat pressure type and rotary type punching machines used for punching cartons and the like. In the rotary type, both punching die and face plate are processed into a cylinder shape, and the die life is relatively long. Although there are advantages such as long punching accuracy, good time for preparation, etc., it is extremely expensive and can only be used for large quantities of products (cartons). 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.

In the punching die for a carton blank, a part where two cut lines of the carton blank are orthogonally contacted, for example, a seal end carton (a paper box having a folding cylindrical structure as shown in FIG. 1, and a cylindrical body part) In the carton that is glued and closed at both ends, the ear piece extends into the upper extension from the body component plate and is adjacent to the side edge cut line of the top plate, such as the adjacent top plate and the ear piece. A portion where the upper end cut line crosses and abuts (main part A in FIG. 1), and a portion where the cut line of the bent portion provided at one side end of the ear piece is bent and contacts the side edge cut line of the top plate (see FIG. In FIG. 1, the main part B) and the like form a punching blade having a continuous cutting blade part in the structure of the punching die punching blade. Therefore, the main part A in FIG. As shown in c), along the side of one punching blade β ′ By a portion end face chamfered lower than the cutting edge of the cutting edge of the other punching blade alpha 'abut, by a succession of respective cutting edge, in which punched score line continuous is possible. Similarly, in FIG. 5A, FIG. 5B, and FIG. 5C, the main part B of FIG. 1 is such that the end face of the punching blade γ ′ that contacts with inclination is along the side surface of one punching blade δ ′. A part of the cutting edge and a lower part of the cutting edge are chamfered.
About the structure which constitutes a continuous score line by chamfering the end face of one of the punching blades in the abutting punching blade as described above, and continuing the tip cutting edge portion of the punching blade in contact with each other, Known (for example, Patent Document 1).
JP-A-63-3318296

  However, when the punching blade structure of the cut line contact portion is as described in the previous section, the cutting blade portion of the punching blade α ′ (γ ′ in FIG. 5) as shown in FIGS. 4 (c) and 5 (c). The remaining upper edge of the cutting edge is chamfered into a small triangular protrusion S by chamfering the lower edge and the lower edge thereof, and the protrusion of the cutting edge by a continuous press pressure in the punching process of the carton blank. S tends to be damaged, and the continuous cutting state of the cut line contact portion is damaged. Moreover, in the punched carton blank, the defective part of the punching blade is automatically in the “blade-stopped” state, and the “warm (both tataki or mushiri)” process (a plurality of carton blanks laid out in the original fabric is individually In the process of removing unnecessary frame parts and window extraction parts, etc., it may be performed in the machine at the same time as punching.) Further, there is a problem that a peeling state (paper peeling, paper curling) from the unremoved portion to the front and back surfaces also occurs.

  Therefore, an object of the present invention is to solve the above-described problem, and in a punching die for a carton blank, a punching blade with which a contact portion of a score line formed by punching the carton blank comes into contact As a result of the continuous cutting blades, the sharp cut lines become continuous, the occurrence of unnecessary “blade-stopping” conditions due to missing punching blades, and the resulting contamination of the front and back surfaces of the blank, such as “paper peeling and paper curling”. An object of the present invention is to provide a structure of a punching blade in a punching die of a carton blank score line contact portion.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a punching die configured by embedding a punching blade having one side edge of a strip-shaped steel plate as a cutting blade and a ruled pressing blade not having a blade edge portion embedded in a base plate. The first punching blade disposed and the second punching blade cross-contact with the first punching blade, and the end surface of the second punching blade is in contact with the first punching blade at an angle or shape that crosses the first punching blade. Chamfering, and at least the width of the surface of the first punching blade in contact with the side surface of the first punching blade that is in contact with the second punching blade over the entire height of the first punching blade, and the first punching blade A groove-like portion having a depth that is substantially half the thickness and leaving the cutting edge of the cutting blade portion from the side surface with which the second punching blade abuts is formed, and the chamfered end surface of the second punching blade is On the side of the first punching blade A punching blade contact in a punching die for a carton blank, wherein the cutting blade portion of the first punching blade and the cutting blade portion of the second punching blade are made continuous by being inserted into and contacted with the formed groove-shaped portion. The structure of the part. By configuring in this way, the cut line abutting part of the cut part formed by punching the carton blank is continuous with a sharp cut line, and an unnecessary “blade stop” state is generated due to a defect of the punching blade. In addition, the structure of the punching blade abutting portion in the punching die for carton blanks does not cause the blank surface condition such as “paper peeling and paper curling” accompanying this.

  The invention according to claim 2 is a punching die for carton blank punching having the structure of the punching blade according to claim 1, and, as in the prior art, the upper end portion of one of the punching blades that abuts, The punching process does not cause partial punching blade defects due to the continuous press pressure in the punching process, and the state of the continuous cutting blade at the cut line contact portion is not impaired.

  The invention described in claim 3 is a carton blank which is punched and cut using the punching die for carton blank punch described in claim 2, and the score line of the contact portion formed by punching is Carton blank table such as "paper scraping" or "paper curling" caused by "blade stop" state due to the occurrence of an unnecessary "blade stop" state due to the defect of the punching blade due to continuous cutting blades There is no contamination of the back surface. Further, since there is no contamination of the blank, there is no paper feed failure in the subsequent process such as the pasting process.

  The punching blade structure in the punching die for a carton blank of the present invention is such that the abutting portion of the score line formed by punching the carton blank is chamfered on the groove-like portion formed on the side surface of the one punching blade. By adopting a configuration in which the end face part is inserted and abutted, the abutting cut lines can be continuous, so that it is continuous in the punching process of the carton blank generated in the punching blade structure in the conventional punching die for carton blank. This eliminates the defect that the continuous punching blade state of the cut line abutting part is damaged without causing the upper end of the abutting part of the punching blade end surface, that is, the tip of one cutting edge part to be lost due to the pressing pressure. I can do it. In addition, an unnecessary “blade stop” state of the carton blank generated due to the defect of the upper end of the abutting portion of the punching blade end surface generated by the conventional punching blade structure does not occur. It is possible to prevent contamination of the front and back surfaces.

  In the carton blank punching die using the punching blade structure of the present invention, as in the prior art, the upper end of one abutting punching blade causes a partial punching blade defect due to the press pressure that continues the punching process. In addition, since the continuous sharp punching blade state of the cut line contact portion is not impaired, a carton blank punching die that does not hinder productivity can be obtained. Also, in the punching die manufacturing process, the processing of each end face part for abutting the punching blade end face is easier than the conventional one, and the abutting process between the punching blade end faces is also easy, so it is necessary for the process. The time can be shortened and there is an economic effect.

  Since the carton blank punched out by the carton blank punching die using the punching blade structure of the present invention has no occurrence of the “blade stop” state caused by the defect of the punching blade at the cut line contact portion, the contact portion angle The "blade stopper" part will not be left untouched at the part, and the appearance will not be lost. Also, in the "punching" process or the "warm (both of swords)" Since there is no peeling state (paper peeling or paper curling) on the front and back surfaces, the occurrence of defective products can be suppressed and the yield can be improved. Further, since there is no contamination of the blank, there is a secondary effect that there is no paper feed failure or the like in a post process such as a pasting process.

  The present invention will be described in detail below with reference to the drawings. FIG. 1 is a developed plan view showing a carton blank state of an embodiment using a punching blade structure in a carton blank punching die according to the present invention. FIG. 2A is a partially enlarged plan view for explaining the structure of the punching blade contact portion in the punching die of the carton blank main part A of FIG. FIG. 2B is a partially enlarged perspective view for explaining the structure of the punching blade contact portion in the punching die of the main part A. FIG. 2C is a partially enlarged cross-sectional view for explanation taken along line XX when the configuration of FIG. FIG. 3A is an explanatory partial enlarged plan view showing a configuration of a punching blade contact portion in the punching die of the carton blank main part B of FIG. FIG. 3B is a partially enlarged perspective view for explaining the structure of the punching blade contact portion in the punching die of the main part B. FIG. 3C is an explanatory partial enlarged cross-sectional view taken along the line XX when the configuration of FIG. FIG. 4A is a partially enlarged plan view for explaining the prior art of the configuration of the punching blade contact portion in the punching die of the carton blank main part A of FIG. FIG. 4B is a partially enlarged perspective view for explaining the prior art of the configuration of the punching blade contact portion in the punching die of the main part A. FIG.4 (c) is the elements on larger scale for description in the XX line which looked at the structure of FIG.4 (b) from the arrow direction c. FIG. 5A is a partially enlarged plan view for explaining the prior art of the structure of the punching blade contact portion in the punching die of the carton blank main part B of FIG. FIG. 5B is a partially enlarged perspective view for explaining the prior art of the structure of the punching blade contact portion in the punching die of the main part B. FIG. 5C is a partially enlarged sectional view for explanation taken along the line XX when the configuration of FIG.

FIG. 1 is a development plan view showing a carton blank state of an embodiment using a punching blade structure in a carton blank punching die according to the present invention. A blank P formed by punching a sheet material such as paperboard is a folding line L1. , L2, L3, and L4, the sticking plate 5, the back plate 4, the left side plate 3, the front plate 2, and the right side plate 1 are connected in order, and the folding lines L7 and L11 are provided on the vertical extension of the front plate 1. A top surface plate 5 and a bottom surface plate 9 are respectively extended through a vertical extension of the back surface plate 4, and a polymerization top surface plate 6 and a polymerization bottom surface plate 10 are respectively extended via folding lines L5 and L9. Ear pieces 7 and 11 are extended on the vertical extension of 1 via fold lines L8 and L12, respectively, and ear pieces 8 and 12 are extended on the vertical extension of the left side plate 3 via fold lines L6 and L10, respectively. Yes.
In the figure, the portions where the score lines intersect each other are shown as circles A and B, respectively. The main part A is in contact with the vertical cut line of the upper end side of the ear piece 9 at right angles to the vertical cut line of the left end side of the top plate 6, and the main part B is perpendicular to the left end side of the bottom plate 10. A portion where the right end side of the ear piece 13 is in contact with a vertical cut line parallel to the left end side of the bottom plate 10 as an inclined cut line of about 45 degrees is shown.
In the carton blank, the abutting portions between the score lines are generated at each part, and the angle at which each score line abuts also varies depending on the shape and structure of the carton, This also occurs between a plurality of carton blanks laid out in the same manner. The abutting state of the score line shown in the carton of the embodiment is an example of a carton using the punching blade structure of the abutting portion of the cutting blade in the punching die for a carton blank according to the present invention, It is not limited to this.

FIG. 2A is a partially enlarged plan view for explaining the structure of the punching blade contact portion in the punching die of the carton blank main part A of FIG. FIG. 2B is a partially enlarged perspective view for explaining the structure of the punching blade contact portion in the punching die of the main part A. FIG. 2C is a partially enlarged sectional view for explanation taken along the line XX when the configuration of FIG.
In FIG. 2A, α and β shown in the drawing represent the plan view of the punching blade, respectively. In the carton blank development plan view of the embodiment of FIG. The right end portion of the line of sight, β is also the upper end portion of the vertical cut line on the left edge of the top plate 6, and the punching blade α is orthogonal to the punching blade β, and at least the thickness of the punching blade α over the entire height of the punching blade β. And a state in which the blade edge of the cutting blade portion is inserted and abutted into a groove-like portion drilled to a depth that is approximately half the thickness from the side surface of the punching blade β and the cutting edge portion is left. Yes.
In FIG. 2 (a), the three parallel lines indicating the punching blades α and β are the side lines of the strip-shaped steel plate forming the punching blades on both sides, and the center line is the cutting blade tip of the punching blade. Show.

  The punching blade α has a thickness of at least the punching blade α over the entire height of the punching blade β formed on the side surface of the punching blade β perpendicular to the punching blade α, and the side surface of the punching blade β. From the background art described above, the cutting edge of the cutting edge portion is inserted into and abutted into the groove-like portion formed to have a depth of approximately half the thickness and the remaining depth. ), (B) and (c), because the end face of one punching blade α ′ and the side face of the other punching blade β ′ are in contact with each other, and the respective cutting blade portions are continuous. By chamfering a part of the cutting edge portion of α ′ and an end surface below the cutting edge portion, a minute triangular projection S is formed at the upper end of the cutting blade portion of the punching blade α ′. On the other hand, as apparent from the cross-sectional view of FIG. At the tip of each tip (upper end in the figure), there is no useless protrusion formed on the end face of the punching blade α that abuts, and the cutting blades of each punching blade are in continuous contact. To do.

FIG. 3A is an explanatory partial enlarged plan view showing a configuration of a punching blade contact portion in the punching die of the carton blank main part B of FIG. FIG. 3B is a partially enlarged perspective view for explaining the structure of the punching blade contact portion in the punching die of the main part B. FIG. 3C is an explanatory partial enlarged cross-sectional view taken along the line XX when the configuration of FIG.
In FIG. 3A, γ and δ shown in the drawing represent the plan view state of the punching blade. In the carton blank development plan view of the embodiment of FIG. 1, γ is provided at the right end of the ear piece 13. The part of the cut line of the bent part is bent in the middle and is inclining to the right by approximately 45 degrees, δ is also the upper end part of the vertical cut line on the left edge of the bottom plate 10, and the punching blade γ is parallel to the punching blade δ The end face with which the punching blade γ contacts is cut at an angle that makes contact with the side surface of the punching blade δ, that is, approximately 45 degrees, while the punching blade δ The side surface of the punching blade γ contacts the entire height of the punching blade δ, and at least the width of the surface of the punching blade γ that contacts the punching blade γ and the thickness of the side surface of the punching blade δ that contacts the punching blade γ. About half of the cutting edge This shows a state in which the chamfered end face of the punching blade γ is inserted into and abutted into a groove-like part formed to have a depth that leaves the cutting edge of the part.
As in FIG. 2 (a), the three parallel lines indicating the punching blades γ and δ in FIG. 3 (a) are the side surface line of the strip steel plate, the center line being formed on both sides, respectively. Indicates the cutting edge tip of the punching blade.

Among the background art described above, in FIGS. 5 (a), (b) and (c), each cutting blade is formed by contact between the end surface of one punching blade γ ′ and the side surface of the other punching blade δ ′. Since the part is continuous, a part of the cutting edge of one punching blade γ ′ and the end surface below the cutting edge are chamfered, so that a small triangle is formed on the upper end of the cutting edge of the punching blade γ ′. Whereas the protruding portion S having a shape is formed, the end surface with which the punching blade γ is in contact with the side surface of the punching blade δ is cut at an angle of approximately 45 degrees, that is, the punching blade δ as described above. The side surface of the punching blade γ contacts the entire height of the punching blade δ, and at least the width of the surface of the punching blade γ that contacts the punching blade γ and the thickness of the side surface of the punching blade δ that contacts the punching blade γ. Drilled to a depth that is approximately half of the depth and leaves the cutting edge of the cutting edge By making the chamfered end face of the punching blade γ into the inserted and abutted state with the groove-shaped portion thus formed, as is apparent from the sectional view of FIG. 3C, the tips of the punching blades γ and δ ( In the portion where the cutting edge portion (at the top in the drawing) abuts, useless protrusions are not formed on the end face of the abutting punching blade γ, and the cutting edge portions of the respective punching blades are in contact with each other.
The punching die having a continuous cutting blade portion as in the above configuration has a continuous cutting blade, and the cutting blade contact portion is not damaged even by a continuous press pressure in the carton blank punching process. The continuous cutting state is not impaired. In addition, since the punched carton blank does not enter the “blade stop” state due to a missing cutting edge, it does not obstruct the above-described “warm” (both tataki and mushiri) process, and the “blade stop” portion is unnecessary. There is no occurrence of an unremoved state or a state of peeling from the unremoved portion to the front and back surfaces (paper peeling, paper curling).

The configuration of the punching blade in the contact portion of the cutting blade in the punching die of the carton blank described above is laid out not only in the component part of the single carton blank as shown in the embodiment but also in the original fabric. The punching blade contact portion shown in the embodiment is also generated between a plurality of carton blanks, and the angle at which each cutting blade abuts also changes depending on the design and the structure of the carton. It is not limited to the configuration of Further, in the embodiment, the punching blades that contact each other form a punching blade that forms a straight line, and the so-called T-shaped or substantially T-shaped contacting shape is used. However, the present invention is not limited to this. The punching blade is a punching blade that forms a curve, or one of the punching blades is a punching blade that forms a bending line (for example, a V shape) and the other punching blade is in contact with the bent portion (for example, a Y-shaped intersection) It is also possible to use it for a structure like a part.
In either configuration, the chamfered end surface portion of the other punching blade is inserted and abutted into the groove-shaped portion formed by leaving the cutting blade tip portion on the side surface of one punching blade. The cutting blade part of each punching blade is continuously continued as shown in the manufacturing drawings, and a partial top edge of the punching blade end face, that is, a chipping at the tip of the cutting blade, is generated by a continuous press pressure in the carton blank punching process. There is no such thing, and the continuous punching blade state of the cut line contact portion is not impaired. Moreover, since the punching blade state is not impaired, it is possible to obtain a carton blank punching die that does not impair the productivity. In the punching die manufacturing process, each end face part for contacting the punching blade end surface Compared with the conventional process, the punching blade end faces are also easily contacted with each other. In addition, the unnecessary “blade stop” state of the carton blank, which has conventionally occurred due to the defect of the upper end of the abutting portion of the punching blade end surface, will no longer occur, so the front and back surface of the carton blank will be soiled, such as “paper peeling, paper curling”. do not do.

The expansion | deployment top view which shows the carton blank state of the Example using the punching blade structure in the carton blank punching die which concerns on this invention. (A) The partial enlarged plan view for description which shows the structure of the punching blade contact part in the punching die of the carton blank principal part A of FIG. (B) The partial expansion perspective view for description which shows the structure of the punching blade contact part in the punching die of the principal part A similarly. (C) The partial expanded sectional view for description in the XX line which looked at the structure of FIG.2 (b) from arrow direction a. (A) The partial enlarged plan view for description which shows the structure of the punching blade contact part in the punching die of the carton blank principal part B of FIG. (B) The partial expansion perspective view for description which shows the structure of the punching blade contact part in the punching die of the principal part B similarly. (C) The partial expanded sectional view for description in the XX line which looked at the structure of FIG.3 (b) from the arrow direction b. (A) Partial expansion plan view for description which shows the prior art of the structure of the punching blade contact part in the punching die of the carton blank main part A of FIG. (B) The explanatory partial expansion perspective view which shows the prior art of the structure of the punching blade contact part in the punching die of the principal part A similarly. (C) The partial expanded sectional view for description in the XX line which looked at the structure of FIG.4 (b) from the arrow direction c. (A) The partial enlarged plan view for description which shows the prior art of the structure of the punching blade contact part in the punching die of the carton blank principal part B of FIG. (B) The explanatory partial expansion perspective view which shows the prior art of the structure of the punching blade contact part in the punching die of the principal part B similarly. (C) The explanatory partial expanded sectional view in the XX line which looked at the structure of FIG.5 (b) from the arrow direction d.

Explanation of symbols

P Blank 1 Right side plate 2 Front plate 3 Left side plate 4 Back plate 5 Adhering plate 6 Top plate 7 Polymerized top plate 8, 9 Ear piece 10 Bottom plate 11 Polymerized bottom plate 12, 13 Ear piece A, B Main part (cut line) Contact part)
α, β, γ, δ punching blades α ', β', γ ', δ' punching blades (prior art)
S Protrusion

Claims (3)

A first punching blade disposed in a punching die configured by embedding a punching blade having one side edge of a strip-shaped steel plate as a cutting blade and a ruled pressing blade not having a cutting edge portion embedded in a base plate, and the first punching A second punching blade crosses and abuts the blade, and an end surface of the second punching blade is chamfered at an angle or a shape crossing and contacting the first punching blade, and the second punching blade of the first punching blade is chamfered. The width of at least the surface of the first punching blade that contacts the side surface where the second punching blade contacts, and the thickness of the first punching blade from the side surface of the first punching blade that contacts the side surface where the second punching blade contacts. A groove-like portion that is half and has a depth that leaves the cutting edge of the cutting edge portion is formed, and the chamfered end face of the second punching blade is inserted into the groove-like portion formed on the side surface of the first punching blade. In contact with the first punch Structure of the punching blade contact portion of the carton blank punching die, characterized in that is continuous and the cutting edge of the cutting edge of the blade and the second punching blade. A punching die for punching a carton blank having the structure of the punching blade according to claim 1. A carton blank, which is punched and cut using the punching die for carton blank punching according to claim 2.

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