JP6344712B2 - Notch forming blade set for packaging bags - Google Patents

Description

The present invention relates to Roh pitch forming tool set for forming a notch for opening tear the edge of the packaging bag (for easy-open).

  For example, as shown in FIG. 7, a notch N for starting tearing (for easy opening) is formed at the edge Ba (thermal welding portion) of the packaging bag B in many of the packaging bags (sealed bags) made of synthetic resin film. Has been. The notch N is formed with a scratch or a notch in advance at the starting end position (edge Ba) of the tearing portion P of the packaging bag B. When the notch N is torn, the packaging bag B can be easily opened. In the following description, the edge Ba of the packaging bag B may be simply referred to as a bag edge.

  As shown in FIG. 7, most of the notches N for starting tearing are formed on the left and right edges Ba, Ba of the packaging bag B. In this case, the left and right notches N, N are generally It is formed as shown in FIG. That is, at the time of manufacturing the packaging bag B, as shown in FIG. 8, the edges Ba ′ and Ba ′ of the adjacent packaging bags B ′ and B ′ are continuous with each other at one heat-sealing portion C. In the case where the intermediate part (scheduled cutting line Q) of the heat-sealing part C is cut and divided into a single packaging bag, a double-length notch N ′ is processed in advance at a position across the planned cutting line Q. In the subsequent cutting step, the middle part (scheduled cutting line Q) of the double-length notch N ′ is divided into two parts so that the left and right edges Ba and Ba of the packaging bag B are respectively shown in FIG. Notches N and N are formed. In this case, a notch forming blade having a length twice as long as the notch N to be formed is used.

  As this type of notch N, there are generally one in which the edge of the packaging bag is cut into a wedge shape (referred to as a V-notch) and one in which a single linear cut is made in the edge of the packaging bag (referred to as an I-notch). The V-notch and I-notch have the following advantages and disadvantages.

  First, the V-notch has the advantage that the area of the notch is large, so that it is easy to find the notch formation location. However, when the V-notch is used, a corner is formed at the notch at the bag edge, and the other corners. There is a problem that the article may be caught or the corner may hit a finger (feel pain). Further, in this V notch, the edge Ba of the packaging bag B is cut into a V shape, so that the removal process of the cut piece is troublesome at the notch processing stage.

  By the way, as what forms this kind of V notch, there exists what is shown, for example in Unexamined-Japanese-Patent No. 2013-103732 (patent document 1), but in order to form V notch, the blade edge | tip of the blade is shape | molded into a triangle. There is a need to. In addition, in order to form the cutting edge into a triangle in this way, there is a problem that high-level (precise) processing is required and the manufacturing cost of the blade is high.

  On the other hand, in the I notch, since a single linear cut is made at the edge of the packaging bag, the shape of the blade is simple and the manufacturing cost is low, and the corner of the bag edge is not easily formed. Although there is an advantage that it is difficult for other articles to be caught and hit with fingers, there is a problem that the notch formed is a single line, so that it is difficult to see (it is difficult to find the notch formation location).

JP 2013-103732 A

Accordingly, the present invention, Roh pitch that is possible formed in excellent shape to functions such as packaging bags of finding a notch to be formed at the edges ease and caught preventing property, Ru can and easily manufactured at relatively low cost The object is to provide a forming knife set.

  The present invention has the following configuration as means for solving the above problems.

[Invention of Claim 1 of the Present Application]
The invention of claim 1 of the present application is directed to a notch forming blade set for a packaging bag for forming a notch for starting tearing at an edge of the packaging bag. In the following description, the edge of the packaging bag in which the notch is to be formed may be simply referred to as the bag edge.

And the notch formation blade set of Claim 1 of this application superposed | polymerized through the spacer of the predetermined thickness the several sheet | seat blade which made the whole thin sheet | seat, and formed several blade parts at intervals on the right and left. A notch forming blade integrated in a state and a blade receiving base for receiving the respective blade portions of the notch forming blade, and the respective blade portions of the notch forming blade on the upper surface of the blade receiving base correspond to each other. While each blade portion is provided with a blade portion entry space that is partitioned for each blade portion and can individually enter the blade portion, each blade portion entry space is provided with each sewing blade. The guard members are bonded to both surfaces of a plurality of comb-shaped members each provided with a recess at a position corresponding to the thickness of each of the blade portions, so that both side surfaces of the recess and the both guard materials face each other. It is divided by each side It is.

Form notches for the size of each sewing blade in the notch-forming blade, the width and number of each blade portion of the sewing blade, the number of sewing blades used, the thickness of the spacer for holding the interval, etc. It can set suitably according to the specification (dimension) of the packaging bag which should be.

  In addition, a plurality of sewing machine blades are selected by selecting the ones with the required spacing between various types of commercially available long sewing blades and cutting the long sewing blades by the required length. it can. Similarly, a spacer obtained by cutting an elongated thin plate material having a predetermined thickness for each required length can be used.

The notch-forming blade used in claim 1 can be manufactured by integrating with a holder in a state where a spacer is interposed between each necessary number of sewing blades.

The notch forming blade used in claim 1 is moved up and down by, for example, an air cylinder, and presses each blade portion to a predetermined position (notch formation planned position) of the bag edge, thereby each sewing blade to the bag edge. A plurality of rows of perforated cut lines (notch marks) can be formed.

  In addition, when manufacturing packaging bags, if the edges of adjacent packaging bags are continuous with one heat welded portion, the length is doubled at the position across the planned cutting line to be separated in the subsequent process. In the subsequent cutting step, the middle part (scheduled cutting line) of the double-length notch is divided into two so as to form notches on the left and right edges of the packaging bag, respectively. May be. In that case, a machine blade having a length twice that of the notch to be formed is used as a sewing blade of the notch forming blade.

  By the way, in this type of conventional notch forming apparatus, an elastic pedestal made of a rubber material is generally used as a blade cradle for receiving the blade portion of the notch forming knives. In this elastic cradle, the blades of the notch forming knives are used. Although the blade spills hardly occur even if the parts collide, the blade part of the notched blade is repeatedly abutted against this elastic cradle, so that the upper surface of the elastic cradle is damaged in a relatively short period of time. The function as a cradle (notch cutting performance) deteriorates in a short period of time, and the scratched part of the blade cradle peels off as a foreign substance (the foreign substance treatment becomes troublesome).

Therefore, in the blade cradle used in claim 1 of the present application, each blade portion entry space that can enter each blade portion of the notch forming blade is provided on the upper surface thereof. Sometimes each blade part penetrates the bag edge without entering the blade cradle and enters the blade part entry space. Each of the blade entry cavities has an opening area that is slightly larger than the horizontal cross-sectional shape of each of the blades, and the peripheral edge of each of the blade entry cavities is each blade. (When the bag edge is pushed by each blade, the bag edge is cut without bending downward).

In addition, each blade portion entry space of the blade cradle used in this claim 1 is partitioned and formed by joining guard materials to both side surfaces of the comb-shaped material, but in this way, Even if the arrangement of each blade portion in the notch-forming blade is changed, the notch formation is selected by selecting a comb-shaped material having a width and interval of a concave portion corresponding to the width and interval of each blade portion. Each blade portion entry space corresponding to each blade portion of the blade can be formed.

[Invention of claim 2 of the present application]
The invention of claim 2 of the present application is the notch forming blade set of claim 1, wherein the sewing blades of the notch forming blade are polymerized so that the respective blade portions of the sewing blades are arranged in a staggered manner. It is characterized by being.

Thus, when the blade portions of each sewing blade are arranged in a staggered manner, a plurality of sewing blades can be used even if the notch forming blade is constituted by a sewing blade (cuts are formed intermittently). Any one of the sewing machine blades can reliably cut the edge of the bag edge. That is, in the notch forming blade used in claim 2 , even if the notch application position slightly deviates from the appropriate position of the bag edge in the width direction of the bag edge, of the blade parts of the two adjacent sewing blades. One of the blade portions corresponds to a position where a cut can be made at the edge of the bag edge portion.

[Effect of the invention of claim 1 of the present application]
In the notch forming blade set of the invention of claim 1 of the present application, a plurality of sewing blades, which are made of a single thin plate and formed with a plurality of blade portions at intervals on the left and right sides, are polymerized through spacers of a predetermined thickness. Since the notch forming blade integrated in the state is used , the following effects are obtained.

First, since the sewing machine blades and spacers constituting the notch forming blade are both simple in structure and made of a relatively inexpensive material, the entire notch forming blade can be manufactured at low cost.

Secondly, the notch forming blade is integrated with a plurality of sewing blades with spacers interposed between them, so that it can be easily assembled and disassembled. -Can easily handle changes in size.

Thirdly , since the notch forming blade is obtained by polymerizing a plurality of perforation blades through a spacer, the notch provided by the notch forming blade has a plurality of rows of perforations. Therefore, even if it is a linear notch mark (cut) by a sewing machine blade (each blade part), it becomes easy to find a notch formation part by having multiple rows.

Fourth, since the notch marks (cuts) given by the notch forming blade are linear, a cut piece is not generated at the notch processing stage like the V notch (the cut piece removal process is unnecessary). In addition, the notch marks are less likely to be caught.

In addition, on the upper surface of the blade cradle used in the invention of claim 1 of the present application, each blade portion of the notch forming blade is partitioned at each corresponding position, and each blade portion is individually separated. Since the blade part entry cavities that can be entered are provided, the blade pedestal is not worn by each blade part of the notch-forming blade entering the blade part entry cavities. Since the opening area is slightly larger than the horizontal cross-sectional shape of each blade part, the peripheral part of the blade entry space functions well as a cradle for each blade part. When the edge is pushed, the bag edge is surely cut without being bent downward).

Furthermore, each blade portion entry space of the blade cradle is provided with guard materials on both side surfaces of a plurality of comb-shaped members each having a recess corresponding to the thickness of each sewing blade and corresponding to each blade portion. By joining, both the end surfaces of the recess and the opposing side surfaces of the guard members are partitioned, so even if the width and interval of the blade portions in the notch forming blade are changed, the blade portions By selecting a comb-shaped material having a recess width and interval corresponding to the width and interval of the blade, a blade holder having each blade portion entry space corresponding to each blade portion of the notched blade There is an effect that it can be formed easily.

[Effect of the invention of claim 2 of the present application]
In the invention of claim 2 of the present application, in the notch forming blade set of claim 1, since the respective blade portions of each sewing blade are arranged in a staggered manner, the sewing blades (intermittently uncut portions can be formed) are provided. Even if it is used, the blade portion of one of the sewing blades adjacent to each other in the superimposing direction corresponds to the edge of the bag edge portion. That is, even if the notch imparting position by the notch forming blade of claim 2 is shifted in the width direction of the bag edge from the appropriate position of the bag edge, any of the two blade parts of the two sewing blades adjacent to each other in the overlapping direction. The blade portion can make a cut at the edge of the bag edge.

Therefore, according to the notch forming blade set of claim 2, in addition to the effect of claim 1, there is an effect that a linear notch mark (cut) can be surely formed at the edge of the bag edge.

It is a perspective view of the notch formation blade and blade stand which comprise the notch formation blade set of an example of this application. It is a manufacturing method explanatory drawing of the notch formation blade and blade cradle in the notch formation blade set of FIG. It is explanatory drawing of the sewing machine blade formation method of the notch formation blade of FIG. FIG. 4 is an IV-IV cross-sectional view of the notch forming blade set of FIG. 1. It is a VV arrow equivalent view of FIG. It is an enlarged plan view of the notch formation part provided to the bag edge part by the notch formation blade set of FIG. It is a top view of the packaging bag which formed the notch in the bag edge part. It is explanatory drawing of the notch formation method at the time of manufacturing a packaging bag in the state where the edge part of each packaging bag was made continuous.

[Example]
Hereinafter, the notch forming blade set of the present embodiment shown in FIGS. 1 to 6 will be described with reference to FIGS.

  As shown in FIG. 7, the packaging bag B employed in the embodiment of the present invention is obtained by heat-sealing the outer peripheral edge portions of two front and back laminated films having a heat-sealing layer laminated on the inner surface by a predetermined width. . In addition, as a base material of the packaging bag B, the sheet-like thing which consists of a general purpose resin film, paper, metal foil, or those composites is employable.

  The notch forming blade set of the embodiment of the present invention shown in FIGS. 1 to 6 forms notches N and N for starting tearing at positions closer to the upper portions of the left and right edges Ba and Ba in the packaging bag B of FIG. Is to do. In the following description of the embodiments, each edge Ba, Ba of the packaging bag B in which the notch N is to be formed may be simply referred to as a bag edge.

  As shown in FIG. 8 (the same applies to FIG. 5), the notch forming blade set of the embodiment of the present application also has one heat-sealed portion C between the edges Ba ′ and Ba ′ of the adjacent packaging bags B ′ and B ′. In the subsequent process, the intermediate portion (scheduled cutting line Q) of the heat-sealed portion C is cut and divided into product form (single) packaging bags, and FIG. As shown in FIG. 5), a double-length notch N ′ straddling the planned cutting line Q can be processed.

  The notch forming blade set of the embodiment of the present invention shown in FIGS. 1 to 5 is the upper side of the production line in which the packaging bags B ′ and B ′ are continuously transferred as shown in FIG. 8 (and FIG. 5). Is a set of a notch-forming blade 1 disposed on the lower side and a blade support 2 disposed on the lower side of the production line.

  The notch forming blade 1 is integrated in a state in which a plurality of sewing blades 11 made of a thin sheet as a whole and formed with a plurality of blade portions 13 at left and right intervals are superposed via spacers 16 having a predetermined thickness. It has been made.

  Each sewing blade 11 has a base 12 continuous on the upper side, and a plurality of blades 13 are integrally formed in a lower portion of the base 12 in a comb shape. The sewing blade 11 is often made of steel, but may be made of hard resin.

  Each spacer 16 is a rectangular plate having the same height as the base 12 of the sewing blade 11 and a rectangle having the same length as the length of the sewing blade 11 and a thickness of about 1.5 to 2.0 mm. The spacer 16 may be made of an appropriate material (for example, resin) as long as it has shape retention.

  The size of each sewing blade 11, the width and number of each blade portion 13 of the sewing blade 11, the number of used sewing blades 11, etc., conform to the standard (dimensions) of the packaging bag B in which the notch N is to be formed. Each dimension of the sewing machine blade 11 can be set as follows, for example. That is, each sewing blade 11 has a thickness of 0.2 to 0.5 mm, an overall height of 15 to 20 mm, an overall length of 10 to 15 mm, and a height of each blade portion 13 of 5 to 10 mm. The width of the portion 13 can be set to 1.5 to 2 mm, the interval of the notch portions 14 between the blade portions 13 and 13 is set to 0.5 to 1 mm, and the number of the blade portions 13 per sheet can be set to about 4 to 6. . Each numerical value is not particularly limited, and it is needless to say that the design can be changed as appropriate.

As shown in FIG. 3 (a), the sewing blade 11 can be formed by cutting a commercially available long sewing blade 11A by a required length L. At that time, by setting the cutting position to the end position of the notch portion 14, a plurality of the same-shaped sewing blades 11 shown in FIG. 3 (B) can be formed. When the front and back are reversed, the shape shown in FIG.

  The tip of each blade portion 13 of the sewing machine blade 11 used in this embodiment has a horizontal straight line shape, but the tip shape of each blade portion 13 projects in a mountain shape or is inclined obliquely. In this case, the perforation by each blade portion 13 can be easily processed.

  On the other hand, the spacer 16 can also be formed by cutting a long narrow plate-like body by the same length as the length of the sewing machine blade 11.

  And the notch formation blade 1 of this Example has the sewing blade 11 in the state of FIG. 3 (b) and the sewing blade 11 in the state of FIG. 3 (c) alternately (every other) as shown in FIG. And the respective blade portions 13 of the odd-numbered sewing blades 11 and the respective blade portions 13 of the even-numbered sewing blades 11 are illustrated in FIG. As shown in FIG. 5, they can be sequentially arranged in a staggered pattern.

  And in the notch formation blade 1 of this Example, as shown in FIG.1 and FIG.4, in the state which interposed the spacer 16 between the four sewing-machine blades 11, respectively, they are integrated by the holder 3. It is configured. The holder 3 is formed by tightening an inverted L-shaped pedestal 31 and a push plate 32 with a fastening tool (bolt / nut) 33 so that a predetermined number of sewing blades 11 and spacers are interposed between the pedestal 31 and the push plate 32. 16 can be firmly held in a polymerized state.

  As shown in FIGS. 1 and 4, the notch forming blade 1 is attached to the lower end portion of the rod of the air cylinder 5, and the expansion and contraction of the air cylinder 5 causes the continuous sheet heat fusion portion as shown in FIG. 5. A plurality of perforated notch marks (reference numeral Na in FIG. 6) can be formed in C.

  The blade pedestal 2 is a blade that is partitioned for each blade portion 13 at a position corresponding to each blade portion 13 of the notch forming blade 1 on the upper surface thereof, and each blade portion 13 can enter individually. Each part entry space 20 is provided and configured.

  The blade holder 2 employed in this embodiment is manufactured as follows. That is, as shown in FIG. 2, the blade cradle 2 is obtained by alternately superposing a predetermined number of thin plate-like comb-shaped members 21 and elongated plate-shaped guard members 26 as shown in FIGS. It is configured by integrating with the holder 4. The guard material 26 interposed between the two comb-shaped members 21 also has a function as a spacer.

Each comb-shaped member 21 is made of a thin plate material as shown in FIG. 2, and has a convex portion 23 and a concave portion 24 formed in a comb shape on the upper portion of the base portion 22 on the lower side. The thickness of the comb-shaped material 21 is slightly thicker than the thickness of the blade portion 13 of the sewing blade 11 (for example, about 1 mm thick), and the length of each recess 24 is slightly larger than the width of the blade portion 13. It is a long degree. The total thickness of one comb-shaped member 21 and one guard member 26 is set to be the same as the total thickness of one sewing blade 11 and one spacer 16 in the notch forming blade 1.

  In the comb-shaped member 21 used in this embodiment, a total of seven concave portions 24 formed in the length direction is used. The number of the concave portions 24 is a blade portion formed on the sewing machine blade 11. The number may be equal to or greater than the number of 13 (5 in the illustrated example). In the blade holder 2 of this embodiment, the number of comb-shaped members 21 used is six, which is set to be larger than the number of used sewing blades 11 on the notch-forming blade 1 side (four). The number 21 may be equal to or greater than the number of sewing blades 11 used in the notch forming blade 1 (four in the illustrated example).

  When each comb-shaped member 21 is polymerized via a guard member 26 as shown in FIG. 2, each recess 24 of the odd-numbered comb-shaped member 21 and each recess 24 of the even-numbered comb-shaped member 21 are staggered. Two types in which the formation positions of the recesses 24 are shifted so as to be arranged in a shape are used.

  As shown in FIGS. 1 and 4, the blade holder 2 of this embodiment uses a total of six comb-shaped members 21 and a total of seven guard members 26, and the upper surface of the convex portion 23 of the comb-shaped member 21. And the guard material 26 are joined to each other with a predetermined number of comb-shaped members 21 and guard members 26 alternately and sequentially integrated with the holder 4 in a state where the upper surfaces of the guard members 26 are at the same height. ing.

  The holder 4 also has an L-shaped pedestal 41 and a push plate 42 fastened by a fastening tool (bolt / nut) 43 so that a predetermined number of comb-shaped members 21 and guards are provided between the pedestal 41 and the push plate 42. The material 26 can be firmly held in a polymerized state.

  As shown in FIGS. 1 and 5, on the upper surface of the blade cradle 2 formed as described above, each concave portion 24 in the comb-shaped material 21 is located at a position corresponding to each blade portion 13 of the notch forming blade 1. The blade entry cavities 20 defined by the opposite end surfaces of the two and the opposite side surfaces of the guard members 26 sandwiching the comb-shaped member 21 are formed. Each blade portion entry space 20 has an opening area that is slightly larger than the horizontal sectional shape of each blade portion 13 of the notch forming blade 1.

  In this embodiment, the notch forming blade 1 uses four (four rows) sewing blades 11 each having five blade portions 13, whereas the blade support 2 is seven per row. The blade part entry cavities 20 are provided and six rows thereof are used. As described above, the number of formed blade entry spaces 20 on the blade receiving base 2 side (7 × 6 rows) is increased from the number of formed blade portions 13 on the notch forming blade 1 side (5 × 4 rows). Is used even when the number of the blade parts 13 of the sewing blade 11 on the notch forming blade 1 side or the number of the sewing blades 11 is increased (for example, 7 blade parts 13 x 6 sewing blades 11 are increased). The blade holder 2 can be used.

  The notch forming blade set of this embodiment is used as follows. In this embodiment, as shown in FIG. 8, the notch forming blade set is intermittently spaced by one pitch with the edges Ba ′ and Ba ′ of the packaging bags B ′ and B ′ being continuous at the heat-sealed portion C. It is used in the bag production line that is supposed to be transported.

  Then, as shown in FIG. 4, above and below the position where the notch N ′ is to be formed in the continuous bag (the packaging bags B ′ and B ′ are continuous at the heat-sealing portion C) transferred on the bag production line. The notch forming blade 1 and the blade receiving base 2 are respectively disposed in At this time, it positions so that each blade part entrance space 20 of the blade receiving stand 2 may respectively correspond directly under each blade part 13 by the side of the notch formation cutter 1.

  In this state, when the notch forming blade 1 is moved down by the air cylinder 5 in a state where the position where the notch is to be formed in the continuous bag is located immediately below the notch forming blade 1, each blade portion 13 of the notch forming blade 1 is moved. Passes through the notch forming portion of the heat-sealing portion C of the continuous bag and enters each blade portion entry space 20 of the blade cradle 2, and a plurality of rows of perforated notches N ′ are formed in the notch forming portion. It is formed. Thereafter, when the notch forming blade 1 is moved upward and the notch forming portion (the portion N ′ in FIG. 5) in the continuous bag is moved to the bag separating position, the expected cutting line Q (notch forming length) shown in FIG. Cut at the middle part) and cut off the packaging bag B as shown in FIG.

  Thus, the cut packaging bag B (FIG. 6) has notches N formed of a plurality of rows of perforated notch marks Na at the edge Ba, but at the edge of the bag edge Ba. Will form notch marks (two places) in every other row of the plurality of notch marks Na.

  The notch forming blade set of this embodiment has the following functions.

  (a) Since the sewing machine blade 11 and the spacer 16 constituting the notch forming blade 1 are both simple in structure and made of a relatively inexpensive material, the entire notch forming blade can be manufactured at low cost.

  (b) Since the notch forming blade 1 is integrated with a plurality of sewing blades 11 with spacers 16 interposed between them, the notch N to be formed can be easily assembled and disassembled. It is possible to easily cope with changing the shape, size, etc.

  (c) Since the notch forming blade 1 is obtained by polymerizing a plurality of sewing blades 11 via the spacers 16, the notch N provided by the notch forming blade 1 has a plurality of rows of perforations. Therefore, even if it is a linear notch mark Na by a sewing machine blade (each blade part), it becomes easy to find a notch formation part by having a plurality of rows.

  (d) Since the notch mark Na given by the notch forming blade 1 is linear, a cut piece is not generated in the notch processing stage like the V notch (the cut piece is not required to be removed). , The notch mark part becomes difficult to be caught.

  (e) Since the respective blade portions 13 of each sewing blade 11 are arranged in a staggered manner, two adjacent sewing blades even when using a sewing blade (which can intermittently have no cutting portion) Since any one of the 11 blade portions 13 can make a cut at the edge of the bag edge Ba, a linear notch mark Na can be reliably formed at the edge of the bag edge Na. .

  (f) In a notch forming blade set composed of the notch forming blade 1 and the blade pedestal 2, a blade portion entry space 20 through which each blade portion 13 of the notch forming blade 1 can individually enter the upper surface of the blade pedestal 2. Since it is provided, each blade portion 13 of the notch forming blade 1 enters the blade portion entry space 20 so that it does not collide with the blade receiving base 2. Therefore, for example, the blade receiving base 2 made of rubber is not worn out, and the peripheral edge portion of the blade entering cavity 20 functions well as a receiving base for each blade 13.

  (g) Each blade portion entry space 20 of the blade cradle 2 is formed by joining guard members 26 to both side surfaces of a plurality of comb-shaped members 21 each having a recess 24 at a position corresponding to each blade portion 13. In addition, since it is formed by partitioning on both side surfaces of the recess 24 and the opposite side surfaces of the both guard members 26, even if the width and interval of each blade portion 13 in the notch forming blade 1 are changed, Each blade portion corresponding to each blade portion 13 of the notch forming blade 1 by selecting the comb-shaped material 21 having the width and interval of the concave portion 24 corresponding to the width and interval of each blade portion 13. A blade cradle 2 having an entry space can be formed. Therefore, even if each blade portion 13 of the notch forming blade 1 is changed in arrangement, the corresponding blade receiving base 2 can be formed relatively easily.

  1 is a notch-forming blade, 2 is a blade holder, 3 is a holder for a notch-forming blade, 4 is a holder for a blade holder, 11 is a sewing machine blade, 13 is a blade portion, 16 is a spacer, 20 is a space for entering the blade portion, 21 is a comb-shaped material, 23 is a convex part, 24 is a concave part, 26 is a guard material, B is a packaging bag, Ba is an edge, N is a notch, and Na is a notch mark.

Claims (2)

A notch forming blade set for forming a notch (N) for starting tearing at an edge (Ba) of a packaging bag (B),
Integrated in a state where a plurality of sewing blades (11) made of a single thin plate as a whole and formed with a plurality of blade portions (13) with left and right intervals are superposed via spacers (16) of a predetermined thickness. A notch forming blade (1), and a blade pedestal (2) for receiving each blade portion (13) of the notch forming blade (1),
Each blade portion (13) is partitioned for each blade portion (13) at a corresponding position of each blade portion (13) of the notch forming blade (1) on the upper surface of the blade receiving base (2). While each of the blade entry cavities (20) can be individually entered (13),
Each of the blade entry cavities (20) has a plurality of comb-shaped members provided with recesses (24) at positions corresponding to the thicknesses of the respective sewing blades (11) and corresponding to the blades (13). By bonding the guard material (26) to both surfaces of (21), the both sides of the recess (24) and the opposing side surfaces of the both guard materials (26) are partitioned.
A notch forming blade set for a packaging bag. The packaging bag according to claim 1, wherein each of the sewing blades (11) is superposed such that the respective blade portions (13) of the respective sewing blades (11) are arranged in a staggered manner. Notch forming blade set .

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