JP7234833B2 - bag making equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-making apparatus that manufactures packaging bags while continuously supplying resin-made film materials.

2. Description of the Related Art Conventionally, a packaging bag made of a flexible packaging material such as a flexible plastic film has been widely used as a container containing foodstuffs, liquid detergents, and the like.
In general, such a packaging bag is produced by a sealing step in which predetermined regions of a film material that is intermittently conveyed are heat-sealed to sequentially form portions corresponding to the packaging bag, and a notch for opening is formed in each portion corresponding to the packaging bag. A notch forming process, a corner cutting process in which, for example, R processing is performed on the four corners of each packaging bag corresponding part, and the film material is cut along the cut lines set between adjacent packaging bag corresponding parts. and a cutting step of separating the individual packaging bags by performing in-line.

In such a manufacturing method, for example, a film material is punched out using a punch and a die, and the corners are cut into corners to perform corner cutting. If it does not match correctly, there is a problem that a protrusion called "tsuno" occurs.
In order to address such a problem, as shown in FIG. 7, Patent Document 1 discloses a feeding direction of the film material F set between the adjacent packaging bag equivalent portions 100, 100 (indicated by the white arrow in FIG. 7). ) has been proposed in which the film material F is shear-cut along two cut lines L1 and L2 spaced apart from each other.

JP 2018-199215 A

The notch forming process is performed by punching the notch holes 205 across the two cut lines L1 and L2 using, for example, a punch and a die. By cutting along the cut lines L1 and L2, one notch hole 205 can be used to form the notch 115 of the preceding packaging bag portion 100 and the subsequent notch 115 of the packaging bag corresponding portion 100 .
However, when the cutting process is performed by the method described in Patent Document 1, as shown in FIG. Cut waste W separated from the margin area portion ML2 is produced. In addition, since the cut waste generated by the margin area ML1 on the opening 101 side of the packaging bag 110 is generally small, the cut waste is not reliably removed by suction by the suction means, and adheres to the packaging bag 110 and mixes with the product. There is a risk.
The actual situation is that the presence or absence of cut waste adhering to the packaging bag is checked by a worker (operator).

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a bag-making apparatus capable of preventing the adhesion of cut scraps generated by the cutting process to the packaging bag and having high production efficiency of the packaging bag. aim.

The bag-making apparatus of the present invention includes an intermittent feeding unit that intermittently feeds a film material formed so that the portion corresponding to the packaging bag continues through a band-shaped margin region, and a notch for opening is formed in the portion corresponding to the packaging bag. a notch-forming processing unit that processes the corners of the portion corresponding to the packaging bag into a corner-cutting shape; A bag making apparatus comprising: a cutting unit for shear cutting a film material; and a discharge unit for sucking and discharging cut scraps generated in the cutting unit, wherein the notch forming unit includes the first cut line. and a second notch forming member forming a second notch independent of the first notch across the second cut line. By doing so, the above problems are solved.

According to the bag-making apparatus of claim 1, when the film material is cut along the first cut line and the marginal area remaining in the packaging bag is removed, cut waste formed by the marginal area cuts the notch forming portion. It occurs as one piece without being pinched and separated. Therefore, the cutting waste generated in the cutting section can be reliably sucked and removed by the discharging section, and the cutting waste can be prevented from adhering to the packaging bag.
In addition, since the number of workers required for confirming the presence or absence of cutting waste adhering to the packaging bag can be reduced, the work load can be reduced and high production efficiency can be obtained.

In the case of punching notch holes in the notch-forming processing section in order to form notch-shaped notches in the resulting packaging bag, the margin area portion on the opening side of the packaging bag becomes even smaller, and conventional methods are used. In this case, cutting waste generated by the cutting process tends to adhere to the packaging bag. However, according to the bag-making apparatus of claim 2, even in the case of forming a notch-shaped notch, the above effects can be obtained reliably.

According to the bag making apparatus of claim 3, two mutually independent notch holes can be formed in two adjacent packaging bags by a single punching operation, and the notch blade can be operated. Since only one driving mechanism is required, the structure of the device can be simplified.

According to the bag-making apparatus of claim 4, punching waste can be removed by being blown away by an air flow, so that punching waste can be prevented from adhering to the punching blade and other constituent members. In addition, it is possible to avoid the adhesion of cut waste generated during the processing of the previous packaging bag to the packaging bag during the processing of the subsequent packaging bag.

According to the bag-making apparatus of claim 5, in the width direction of the margin area, the notch holes are formed by shearing the film material from the edge side toward the center side of the margin area, thereby forming two notch holes. A desired notch hole can be reliably formed while leaving a portion for isolating the notch hole.

According to the bag making apparatus of claim 6, the first cutting mechanism and the second cutting mechanism are arranged at positions set according to the feed amount of the film material. Alignment with respect to the cutting mechanism and alignment of the second cut line with respect to the second cutting mechanism can be performed easily and reliably. Therefore, it is possible to reliably prevent the occurrence of protrusions at the corners of the packaging bag, and to prevent the occurrence of unnecessary cut waste that may adhere to the packaging bag.

1 is a schematic diagram showing a configuration of a main part of an example of a bag-making apparatus of the present invention together with a plan view of a film material; FIG. FIG. 10 is a plan view showing the state of the corners of the portion of the film material corresponding to the packaging bag after corner cutting. 1 is a view showing one configuration example of a punch for forming a notch used in the bag making apparatus of the present invention, (a) an end view seen from the tip end side, (b) a cross-sectional view taken along line AA in (a), (c) is an enlarged view of a portion surrounded by a two-dot chain line in (b). FIG. 2 is a diagram showing one configuration example of a notch forming die used in the bag making apparatus of the present invention, including (a) a plan view, (b) a cross-sectional view taken along the line BB in (a), (d) (a). ) is an enlarged view of a portion surrounded by a two-dot chain line. FIG. 4 is a schematic diagram for explaining notch forming processing performed in the bag making apparatus of the present invention; FIG. 3 is a schematic diagram for explaining shear cut processing performed in the bag making apparatus of the present invention; FIG. 10 is a schematic diagram showing an example of shear-cut processing in a conventional bag-making apparatus.

The bag-making apparatus of the present invention produces a film material in which a portion corresponding to a packaging bag formed by sealing a predetermined area of a film material supplied from a raw material continues at least in the length direction of the film material via a margin area. A bag-making apparatus for manufacturing a packaging bag by cutting along a predetermined cut line is configured to perform in-line notch forming and corner cutting.
The bag-making apparatus of the present invention may be configured to form a portion corresponding to the packaging bag so as to be continuous in the width direction of the film material, and to manufacture a plurality of packaging bags at the same time. The number (number) of portions corresponding to packaging bags arranged in the width direction of the film material is not particularly limited.

The margin area is preferably set within a range of 1 to 3 mm, for example, from the viewpoint of reducing film material loss. In addition, when packaging bags are manufactured by multi-piece production, the margin area set between the portions corresponding to the packaging bags lined up in the width direction of the film material is set between the portions corresponding to the packaging bags lined up in the length direction of the film material. It may be of the same size or different size than the margin area to be printed.

The film material may be a single-layer or multi-layer film made of a flexible packaging material such as resin film, metal foil, or paper, or may be a slightly thick sheet-like material.
In addition, the form (shape) of the packaging bag formed by the bag-making apparatus of the present invention is not particularly limited. , a packaging bag in which three sides of the folded film are sealed, and the like.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example an embodiment of the present invention in which two packaging bags are taken from a film material.

FIG. 1 is a schematic diagram showing the main configuration of an example of the bag-making apparatus of the present invention together with the plane portion of the film material.
In the film material F, two packaging bag equivalent portions 100 sealed on three sides and having an opening on the other side extend in the width direction of the film material F and in the length direction of the film material F through a strip-shaped margin area MW. It is continuous, and is formed so that the packaging bag equivalent portion 100 in the length direction of the film material F is continuous via a strip-shaped margin area ML extending in the width direction of the film material F. The portion 100 corresponding to the packaging bag is formed so that the opening 101 faces outward in the width direction of the film material F. As shown in FIG. In addition, in FIG. 1, the seal portion 103 is shaded for convenience.

The bag-making apparatus of this embodiment includes a notch-forming processing unit 120 for punching notch holes 105 for forming opening notches 115 in a portion 100 corresponding to a packaging bag of the film material F intermittently conveyed, and a portion 100 corresponding to the packaging bag. A corner cutting processing unit 140 that processes the sharp right-angled corners 102 of the four corners 102 into rounded corners 112, and a laser cutting processing unit 150 that cuts the film material F in the length direction along a predetermined cut line. , a cutting unit 160 that shear-cuts the film material F in the width direction and divides it into individual packaging bags 110; A discharge portion 170 is provided for sucking and discharging the cut waste W generated in the above. The notch forming processing unit 120, the corner cutting processing unit 140, the laser cutting processing unit 150, and the cutting processing unit 160 are arranged along the film material F transport path in the feeding direction of the film material F in this order.

The notch forming processing unit 120 is configured to punch a notch hole 105 in each of the two packaging bag equivalent portions 100 adjacent in the length direction of the film material F by punching, and has a die 121 and a punching blade. and a punch 125 that cooperates with the die 121 to punch the notch hole 105 . The punch 125 is arranged to face the die 121 across the conveying path of the film material F, and is driven to move relatively toward and away from the die 121 .
Note that the notch forming processing unit 120 may be configured to form a cut notch in the portion 100 corresponding to the packaging bag, for example.

The corner cutting section 140 is for punching out the right-angled corner 102 of the packaging bag equivalent portion 100, and is provided with a die 141 and a punching blade, and a punch that performs corner cutting in cooperation with the die 141. 145. The punch 145 is arranged to face the die 141 across the transport path of the film material F, and is driven to move relatively toward and away from the die 141 .
As shown in FIG. 2, the punching blade of the punch 145 in this embodiment has a cross-shaped or diamond-shaped contour such that the contour of the corner 112 of the portion 100 corresponding to the packaging bag is, for example, a 1/4 circular arc. . That is, the punching blades of the punch 145 are arranged in the width direction of the film material F with respect to the two packaging bag equivalent portions 100a and 100b adjacent to each other in the length direction of the film material F and these respective packaging bag equivalent portions 100a and 100b. It is configured such that four corners 102 facing each other of two adjacent packaging bag equivalent portions 100c and 100d can be cut at the same time. The punching blade may have a contour such that the contour shape of the corner 112 of the portion 100 corresponding to the packaging bag is an elliptical arc or other curved arc. The die 141 has a punching edge shape that follows the contour of the punching blade.

The razor-cut processing unit 150 cuts the film material F as the film material F is conveyed, with both edges of the margin area MW in the width direction of the film material F as razor-cut lines L3 and L4, respectively. Two razor blades 151, 151 are arranged in the width direction of F at the same interval as the dimension of the margin area MW.

The intermittent feed unit 155 includes a pair of rolls 156, 156 that are rotationally driven so as to intermittently transport the film material F while alternately repeating transport and stop of the film material F. As shown in FIG. In this embodiment, the pair of rolls 156, 156 are arranged at a position on the rear side of the cutting section 160 in the feeding direction of the film material F. As shown in FIG.

The cutting unit 160 sets both edges of the margin area ML in the length direction of the film material F as a first cut line L1 and a second cut line L2, respectively, and cuts the first cut line L1 and a first cutting mechanism 161 and a second cut line L2. A second cutting mechanism 166 for cutting the 2 cut lines L2 is provided. The first cutting mechanism 161 and the second cutting mechanism 166 are set according to the intermittent feeding amount of the film material F so that the first cutting mechanism 161 is positioned on the front side with respect to the feeding direction of the film material F. They are spaced apart.

The first cutting mechanism 161 and the second cutting mechanism 166 are composed of fixed blades 162 and 167 and are displaceable so as to move toward and away from the fixed blades 162 and 167, and cooperate with the fixed blades 162 and 167 to cut the film material. Movable blades 163, 168 for shearing F are provided. The movable blade 163 in the first cutting mechanism 161 and the movable blade 168 in the second cutting mechanism 166 are driven in synchronization with each other.

Thus, in the bag making apparatus of the present invention, the punching blade of the punch 125 constituting the notch forming processing section 120 is positioned at the trailing edge of the two packaging bag corresponding portions 100 adjacent in the feeding direction of the film material F. A first cutting edge 131 (first notch forming member) for punching a first notch hole 106 that forms a first notch in the portion corresponding to the packaging bag, straddling the first cut line L1, It is configured to include a second cutting edge 135 (second notch forming member) that punches a first notch hole 106 and a second notch hole 107 that forms a second notch independent of each other across the second cut line L2. ing.

In the bag-making apparatus of this embodiment, as shown in FIGS. A first cutting blade 131 and a second cutting blade 131 are integrally formed so that the punching blade 130 is spaced apart in the feeding direction of the film material F (indicated by the white arrow in FIGS. 3(a) to 3(c)). It is composed of a blade 135 .
The first cutting edge 131 is configured such that, in a cross section perpendicular to the width direction of the film material F, the cutting edge surface 132 is inclined in a direction away from the die 121 as it goes forward in the feeding direction of the film material F. The blade 135 is configured such that the cutting edge surface 136 and the cutting edge surface 132 of the first cutting edge 131 are inclined in opposite directions.

The cutting edge surface 132 of the first cutting edge 131 and the cutting edge surface 136 of the second cutting edge 135 are shaped to form, for example, a hexagonal (home base) cutout in the film material F. The shape of the notch hole to be formed (the shape of the cutting edge surface) is not particularly limited. clipping), etc.

The first cutting edge 131 and the second cutting edge 135 have air blow holes 133 and 137 that open to the cutting edge surfaces 132 and 136, and each air blow hole 133 and 137 extends axially inside the shank 126. It communicates with the formed air blow channel 127 .

On the other hand, the die 121 for piercing the notch hole 105 in cooperation with such a punch 125 is composed of a cylindrical body whose one end is closed by an end wall 122, as shown in FIGS. , and the outer surface of the end wall 122 functions as a support surface for the film material F.
The end wall 122 is formed with punching blade insertion holes 123 and 124 having an opening shape corresponding to the shape of the punching blade 130 of the punch 125 and having sharp edges.
The punching blade insertion holes 123 and 124 are formed on the outer peripheral surface of the first cutting blade 131 in a state where the first cutting blade 131 and the second cutting blade 135 of the punch 125 are inserted into the corresponding punching blade insertion holes 123 and 124. and the inner peripheral surface of one punching blade insertion hole 123, and between the outer peripheral surface of the second cutting edge 135 and the inner peripheral surface of the other punching blade insertion hole 124. is configured to form

The operation of the bag making apparatus of the above embodiment will be described below.
In the bag making apparatus of the present embodiment, first, notch holes 105 are formed at predetermined positions of the packaging bag corresponding portion 100 of the film material F intermittently conveyed in a horizontal orientation, for example, in the notch forming processing section 120. The corner 102 of the portion 100 corresponding to the packaging bag in which the notch hole 105 is formed is rounded into a rounded corner 112 in the corner cut processing unit 140, and in the process of passing the film material F through the razor cut processing unit 150, The film material F is cut in the feed direction of the film material F by a razor blade 151, and then cut in the width direction by the cutting unit 160, thereby forming the packaging bag 110 having the notch 115 for opening. manufactured. Punching scraps and cutting scraps generated in the notch forming processing unit 120, the corner cutting processing unit 140, and the laser cutting processing unit 150 are sucked and discharged by suction discharge means (not shown).

In the notch forming section 120, the portion corresponding to the packaging bag positioned at the front in the feeding direction of the film material F (hereinafter referred to as the "preceding packaging bag corresponding portion") is notched as follows. is done.
That is, as shown in FIG. 5(a), a region including a strip-shaped margin region ML set in front of the portion 100p corresponding to the preceding packaging bag and extending in the width direction of the film material F is supported from the bottom side by the die 121. state. In this state, when the punch 125 is driven in a direction approaching the die 121 , the edge portion of the cutting edge surface 132 of the first cutting edge 131 of the punch 125 and the corresponding opening of the punching edge insertion hole 123 of the die 121 are removed. The film material F is sheared by the edges, and a first notch hole 106 is bored across the rear edge of the margin area ML set as the first cut line L1 at a position spaced apart from the leading edge of the film material F. be done. At this time, compressed air is ejected from an air blow hole 133 opening in the cutting edge surface 132 of the first cutting edge 131, thereby promoting the downward bending of the punched portion and blowing off punching scraps downward for removal. .

Then, when the film material F is intermittently conveyed by a predetermined feeding amount, as shown in FIG. A region including the margin region ML between the subsequent packaging bag corresponding portion (hereinafter referred to as “subsequent packaging bag corresponding portion”) 100f is supported by the die 121 from the lower surface side. In this state, the punch 125 is driven in a direction approaching the die 121, so that the second notch hole 107 paired with the first notch hole 106 formed by the previous notch forming process corresponds to the preceding packaging bag. A first notch hole 106 is formed in the portion 100p and in the subsequent packaging bag corresponding portion 100f. That is, for the portion 100p corresponding to the preceding packaging bag, the film material F is pushed by the edge portion of the cutting edge surface 136 of the second cutting blade 135 of the punch 125 and the opening edge of the corresponding punching blade insertion hole 124 of the die 121. After being sheared, a second notch hole 107 is bored across the front edge of the margin area ML set as the second cut line L2. In addition, for the portion 100f corresponding to the subsequent packaging bag, the film material F is pushed by the edge portion of the cutting edge surface 132 of the first cutting blade 131 of the punch 125 and the opening edge of the corresponding punching blade insertion hole 123 of the die 121. A first notch hole 106 that is sheared and independent of the second notch hole 107 of the preceding packaging bag corresponding portion 100p is bored across the rear edge of the margin area ML set as the second cut line L1. .

When the film material F is cut in the width direction by the cutting unit 160, the margin area ML is generated as cut debris. Furthermore, the margin area portion ML1 on the opening 101 side of the packaging bag 110 with respect to the notch hole forming portion N and the margin area portion ML2 on the sealing portion 103 side of the packaging bag 110 with respect to the notch hole forming portion N are integrated. of cutting waste W is generated. Therefore, according to the bag making apparatus of the present embodiment, it is possible to reliably suction and remove the cut waste W generated in the shear cutting process by the cutting section 160, and to reliably prevent the cut waste W from adhering to the packaging bag 110. can be prevented.

An embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. and a second notch-forming member that forms a second notch independent of the first notch across the second cut line. good too.

EXAMPLES Examples conducted to confirm the effects of the present invention will be described below.

[Example 1]
With reference to the configuration shown in FIG. 1, the film material (F) is shear cut in the width direction at two cut lines (L1, L2) set between adjacent packaging bag equivalent portions and spaced apart in the feeding direction of the film material. A cutting-type bag-making device was produced. The punching device constituting the notching section (120) comprises a punch (125) having a punching edge (130) comprising a first cutting edge (131) and a second cutting edge (135).
Using this bag making apparatus, a total of 2,000,000 bags of the various types shown below were manufactured, and the total number of cut scraps adhering to the packaging bags was investigated. Adhesion was not confirmed.
[Bag size (width x height x fold width of bottom material)]
Type A: 110mm x 160mm x 31mm (3 pieces)
Type B: 130mm x 180mm x 36mm (3 pieces)
Type C: 100mm x 160mm x 20mm (3 pieces)
Type D: 120mm x 180mm x 33mm (3 pieces)
Type E: 90mm x 140mm x 28mm (3 pieces)
Type F: 200mm x 290mm (2 pieces)

[Comparative Example 1]
As the punching device constituting the notch-forming processing part, the bag-making device was the same as the bag-making device produced in Example 1, except that a punch having a punching blade for forming one hexagon-shaped notch hole was used. A comparative bag-making apparatus having a configuration was produced.
Using this comparative bag-making apparatus, a total of 2,000,000 packaging bags were produced in the same manner as in Example 1, and the total number of cut waste adhering to the packaging bag was examined. was confirmed to exceed 7000.
The reason for this is not clear in detail, but it is believed that the cutting chips generated in the shear cutting process on the second cutting line are blown up by the effects of static electricity, friction, air retention, and the like.

Reference Signs List 100... Packaging bag equivalent portions 100a, 100b, 100c, 100d... Packaging bag equivalent portion 100p... Leading packaging bag equivalent portion 100f... Subsequent packaging bag equivalent portion 101... Opening 102... Corner portion 103 Seal portions 105, 205 Notch hole 106 First notch hole 107 Second notch hole 110 Packaging bag 112 Corner 115 Notch 120 ... notch forming portion 121 ... die 122 ... end wall 123 ... punching blade insertion hole 124 ... punching blade insertion hole 125 ... punch 126 ... shank 127 . Air blow hole 140... corner cut portion 141... die 145... punch 150... razor cut portion 151... razor blade 155... intermittent feed portion 156... roll 160... Cutting unit 161... First cutting mechanism 162... Fixed blade 163... Movable blade 166... Second cutting mechanism 167... Fixed blade 168... Movable blade 170... Discharge part F ... film material L1 ... first cut line L2 ... second cut line L3, L4 ... razor cut line MW ... margin area ML ... margin area ML1 ... margin area portion ML2・・・ Margin area part N ・・・ Notch hole forming part W ・・・ Cut waste

Claims (6)

an intermittent feeding unit that intermittently feeds a film material formed such that a portion corresponding to a packaging bag is continuous through a band-shaped margin region; a notch forming processing unit that forms a notch for opening in the portion corresponding to the packaging bag; A corner cutting processing unit that processes the corners of the portion corresponding to the packaging bag into a corner shape, and a cutting processing that shear cuts the film material using both edges in the width direction of the margin area as a first cut line and a second cut line, respectively. and a discharge unit for sucking and discharging cut waste generated in the cutting processing unit, wherein
The notch forming processing part forms a first notch forming member that forms a first notch across the first cut line and a second notch that is independent of the first notch across the second cut line. and a second notch forming member. The notch forming processing unit includes a punch having a punching blade that punches a notch hole that forms the notch in cooperation with a die,
The punching blade includes a first cutting blade that punches a first notch hole that forms the first notch, and a second cutting blade that punches a second notch hole that forms the second notch. The bag making apparatus according to claim 1, characterized by: 3. The bag making apparatus according to claim 2, wherein the punching blade is formed integrally with the first cutting blade and the second cutting blade separated in the feeding direction of the film material. . 4. The bag making apparatus according to claim 2, wherein the first cutting edge and the second cutting edge have air blow holes that open to the cutting edge surfaces. The first cutting edge is configured such that, in a cross section perpendicular to the width direction of the film material, the cutting edge surface is inclined in a direction away from the die as it goes forward in the feeding direction of the film material, and the second cutting edge is 5. The bag making apparatus according to claim 2, wherein the cutting edge of the blade is inclined in a direction opposite to the cutting edge of the first cutting edge. The cutting unit includes a first cutting mechanism for cutting the first cut line and a second cutting mechanism positioned behind the first cutting mechanism with respect to the feeding direction of the film material and cutting the second cut line. a mechanism,
The first cutting mechanism and the second cutting mechanism comprise a fixed blade and a movable blade configured to be displaceable toward and away from the fixed blade for shearing the film material in cooperation with the fixed blade. prepared,
6. The movable blade of the first cutting mechanism and the movable blade of the second cutting mechanism are driven in synchronization with each other. Bag making equipment.

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