JP2023108267A - Packaging material cutting knife and vertical bag making, filling and packaging machine - Google Patents

Abstract

To provide a packaging material cutting knife capable of forming a smooth cut area in a packaging material hard to be drawn, and a vertical bag making, filling and packaging machine equipped with the knife.SOLUTION: A packaging material cutting knife 22 for sticking and cutting a packaging material W hard to be drawn comprises: a plate-shaped body 26; a blade 32 formed in the body; and blade slaves 34 formed into V shapes in a plan view and arranged side by side at a prescribed interval D in a width direction X of the blade. Each of the blade slaves is provided with a cutting blade 40 forming a V-shaped pointed end of the blade slave, a blade bottom 42 forming the V-shaped valley of the blade slave and positioned on both sides of the cutting blade in the width direction, a blade tip 44 forming V-shaped two sides of the blade slave and connecting the cutting blade and the blade bottom, a front blade 36 formed on a surface of the blade slave and extending along the blade tip from the blade tip to the blade bottom, and a back blade 38 formed on a backside of the blade slave and having a cutting blade, a blade bottom, and a blade tip similar to those of the front blade. The back blade inclines in a direction where a thickness t2 in a blade thickness direction Z of the front blade decreases.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a knife for cutting packaging materials and a vertical form-fill-seal packaging machine equipped with the knife, and more particularly to a knife for cutting non-stretchable packaging material and a vertical form-fill-seal packaging machine equipped with the knife. Regarding.

Patent Literature 1 discloses a cutting knife provided in a cutting device of a packaging machine for thrusting and cutting a tubular sheet material. This knife includes a plate-shaped main body, a blade formed in the main body, and blades arranged side by side at predetermined intervals in the width direction of the blade. The blade has an isosceles triangle shape, in other words, a V shape in plan view, and has a cutting blade, a blade root, a cutting edge, a front blade, and a back blade.

The cutting edge forms the V-shaped tip of the blade. The cutting edge is located on both sides of the cutting edge in the width direction and forms a V-shaped valley of the cutting edge. The cutting edge is a linear portion that connects the cutting edge and the root of the cutting edge. The front blade is formed on the surface of the blade, includes the cutting edge, extends from the cutting blade toward the base of the blade, and is inclined in a direction to reduce the blade thickness of the blade. The back blade is formed on the back surface of the blade, and has the same cutting edge, blade base, and cutting edge as the front blade.

The front and back blades formed on the knife described in Patent Document 1 are inclined surfaces of the same shape that are inclined in different directions when viewed from the thickness center of the blade, and are formed symmetrically on the front and back sides with the same included angle. (See page 10, lines 17-20, etc.). As a result, the cross section in the blade thickness direction from the cutting edge of the blade to the base of the blade has a rhomboid shape. Each cutting edge presses the packaging material, so that diamond-shaped cut edges are formed in the packaging material in a row in the width direction.

As each knife advances, the cutting edge of the packaging material gradually becomes larger while forming a shape similar to a rhombus. Then, the packaging material is cut by further advancing the thrusting of each blade and connecting the adjacent cut edges in the width direction. That is, while thrusting a portion corresponding to the area of the cut end of the packaging material with each blade of the knife (thrusting process), the packaging material is cut with each cutting edge of the knife to gradually enlarge the cut end of the packaging material ( ripping process). As a result, the packaging material is cut.

Japanese Utility Model Laid-Open No. 1-176012

In recent years, there has been a growing momentum to promote environmental consideration and resource conservation on a global scale, such as the SDGs (Sustainable Development Goals). Attention is focused on packages that reduce Many of the conventional packaging materials are sheet-like films, which are mainly made of petroleum-derived plastic materials. is done.

Since the film packaging material made of plastic material is thin and flexible, the film packaging material is stretched appropriately in the above-mentioned thrusting process, and the cutting edge of the packaging material is smooth in combination with the above-mentioned tearing process. becomes. On the other hand, the paper packaging material is a sheet in which fibers such as wood pulp are entangled, and is more difficult to stretch than the film packaging material. As a result, the paper packaging material is torn to pieces, and uncut ends of the paper packaging material such as fluff of fibers are left uncut, making it impossible to obtain a smooth cut end.

The present invention has been made in view of such problems, and a knife for cutting packaging material capable of forming a smooth cut on a difficult-to-stretch packaging material such as a paper packaging material, and a vertical cutting knife provided with the knife. An object of the present invention is to provide a form-fill-seal machine.

In order to achieve the above object, a knife for cutting packaging material according to one embodiment is a knife for cutting packaging material that pushes and cuts a difficult-to-stretch packaging material, and comprises a plate-shaped main body and a It comprises a formed blade and blades arranged side by side at predetermined intervals in the width direction of the blade and forming a V shape in plan view, and the blade forms a V-shaped tip of the blade. A cutting edge, a cutting edge that is located on both sides in the width direction of the cutting edge and forms a V-shaped valley of the blade, and a cutting edge that connects the cutting edge and the blade base and forms two sides of the V-shaped blade. And, a front blade formed on the surface of the blade and extending along the blade edge from the cutting edge toward the blade base, and a cutting edge formed on the back surface of the blade and the same cutting edge as the front blade, the blade base, and the blade edge , and the back blade is inclined in the direction of reducing the thickness of the front blade in the blade thickness direction.

A vertical bag-making, filling and packaging machine according to one embodiment includes the knife for cutting the packaging material described above, forms a hard-stretchable packaging material into a tubular shape around the bag-making tube, and cuts the formed tubular packaging material. While extending the bag-making tube in the longitudinal direction, lateral seals are formed below the bag-making tube at predetermined intervals in the longitudinal direction of the cylindrical packaging material. The interior of the material is filled with the filling material alternately, and a knife is used to cut the cylindrical packaging material at the horizontal sealing portion to produce a bag filled with the filling material.

A smooth cut edge can be formed in a hard-to-stretch packaging material.

1 is a perspective view of a vertical form-fill-seal machine according to an embodiment; FIG. Fig. 2 is a plan view of the knife; It is an enlarged view of a front blade. It is an enlarged view of a back blade. 4 is a cross-sectional view taken along line AA of FIG. 3; FIG. 4 is a cross-sectional view taken along line BB of FIG. 3; FIG. 4 is a cross-sectional view taken along line CC of FIG. 3; FIG. Viewed from the extending direction of each blade, (a): front view of each cutting blade, (b) to (e): stepwise cross-sectional views in a direction approaching the blade base of each blade. In the process of cutting the tubular packaging material with a knife, (a): the cut end of the tubular packaging material when each blade pushes against the tubular packaging material, (b): the pushing progressed by each blade. (c): the cut end of the tubular packaging material when each blade cuts the tubular packaging material. FIG. 10 is a front view of the bag in which the cut edges of the lateral seal portions cut with a knife are clarified; FIG. 10 is a diagram showing fluffing of fibers at a cut end of a cylindrical packaging material, which has occurred in the past.

FIG. 1 shows a perspective view of a vertical form-fill-seal machine 1 according to an embodiment. This vertical bag-making, filling and packaging machine (hereinafter also simply referred to as packaging machine) 1 includes a bag-making tube 2 that extends vertically. The bag-making tube 2 has a hopper 6 at its upper end, through which a filler such as powder or granular material is supplied. A filling and feeding device (not shown) is arranged above the packaging machine 1 , and feeds a predetermined amount of filling into the bag-making tube 2 via a hopper 6 .

A former 8 is attached above the bag-making tube 2 and below the hopper 6 , and a packaging material delivery path extends from the former 8 to a packaging material reel 10 . A packaging material W is fed out from the packaging material reel 10 via a plurality of rollers 12 . The packaging material W is a non-stretchable packaging material, for example, a sheet-like paper material used for the exterior of the bag P and a sheet-like heat-sealing material used for the interior of the bag P are laminated and bonded together. It is a paper packaging material. The packaging material W fed out from the packaging material reel 10 is guided along the packaging material feeding path and led to the outer circumference of the bag-making tube 2 along the former 8 .

The packaging material W guided along the former 8 is formed into a tubular shape surrounding the bag-making tube 2 , and this tubular packaging material Wc is guided downward along the bag-making tube 2 . Further, when passing through the former 8, both side edges of the cylindrical packaging material Wc form lap portions L which are overlapped with each other in a predetermined form, for example, a form of joining hands together. The packaging machine 1 also includes a packaging material delivery device. The packaging material delivery device has a pair of packaging material feeders 14 .

The packaging material feeders 14 are arranged on both sides of the outer circumference of the bag-making tube 2 below the former 8 . Each packaging material feeder 14 has an endless suction belt 16 to which the tubular packaging material Wc is attracted. In this suction state, the suction belt 14 travels in one direction, so that the tubular packaging material Wc is fed downward along the bag-making tube 2 .

A vertical sealer 18 that can be opened and closed is arranged near the bag-making tube 2 . The vertical sealer 18 is disposed between the pair of packaging material feeders 14 when viewed in the circumferential direction of the bag-making tube 2, heat seals the wrap portion L of the tubular packaging material Wc, and adheres both side edges to each other for vertical sealing. A portion Sv is formed in the bag P. As a result, after passing through the vertical sealer 18, the cylindrical packaging material Wc is completely closed at both side edges.

A horizontal sealer 20 that can be opened and closed is arranged below the bag-making tube 2 . The lateral sealer 20 has a pair of heater blocks 20a, 20b. Each heater block 20a, 20b has a built-in heater. Each heater block 20a, 20b extends in the horizontal direction, which is the direction across the cylindrical packaging material Wc, and contacts and separates from each other in the radial direction of the bag-making tube 2 within the horizontal plane. Thereby, the opening and closing operation of the horizontal sealer 20 is performed.

The heater blocks 20a and 20b sandwich the tubular packaging material Wc from the front and rear by the closing operation of the horizontal sealer 20, thereby forming a horizontal seal portion Sh on the tubular packaging material Wc. The heater block 20a, which is one of the heater blocks 20a and 20b, holds a knife 22 for cutting the packaging material. A blade receiving groove 24 for receiving the knife 22 is formed in the heater block 20b which is the other of the heater blocks 20a and 20b. When the horizontal sealer 20 is closed, the knife 22 slides horizontally toward the blade receiving groove 24 and thrusts and cuts the horizontal seal portion Sh.

A series of operations of the packaging machine 1 configured in this manner will be described below. The packaging machine 1 forms the packaging material W into a tubular shape around the bag-making tube 2 , and feeds the formed tubular packaging material Wc in the longitudinal direction of the bag-making tube 2 , i.e., downward. to form the vertical seal portion Sv. Next, below the bag-making tube 2, a horizontal sealer 20 forms a horizontal seal portion Sh at a predetermined interval in the longitudinal direction of the tubular packaging material Wc. On the other hand, the formation of the lateral seal portion Sh and the filling of the interior of the cylindrical packaging material Wc with the filler are alternately performed. At the same time, the knife 22 cuts the cylindrical packaging material Wc at the horizontal seal portion Sh. Thereby, the bag P filled with the filler is manufactured.

FIG. 2 shows a plan view of the knife 22. FIG. The knife 22 pushes and cuts the cylindrical packaging material Wc of the lateral seal portion Sh in the lateral sealer 20 . A plate-shaped main body 26 of the knife 22 is formed with a bolt insertion hole 28 for holding the knife 22 in the heater block 20a and two engaging notches 30. As shown in FIG. A blade portion 32 is formed on the main body 26 .

A large number of blades 34 are arranged side by side in the width direction X of the blade portion 32 at a predetermined interval D (for example, a pitch of 5 mm). In other words, the width dimension of the blade 34 in the width direction X is the interval D. As shown in FIG. Two front blades 36 are formed on each blade 34 . Back blades 38 (indicated by dashed lines) are formed on the back surface of the blade 34 opposite to the front blades 36 . A direction perpendicular to the width direction X of the blade portion 32 is defined as an extension direction Y of the blade 34 .

FIG. 3 shows an enlarged view of the front blade 36. As shown in FIG. Each blade 34 has a cutting edge 40 , a root 42 and a cutting edge 44 . The cutting edge 40 forms the V-shaped tip of the blade 34 . The blade roots 42 are positioned on both sides of the cutting blade 40 in the width direction X and form a V-shaped valley of the blade 34 . The cutting edge 44 connects the cutting edge 40 and the blade root 42 and forms two V-shaped sides of the blade 34 . The front cutting edge 36 extends along a cutting edge 44 from the cutting edge 40 toward the cutting edge 42 .

Specifically, the front cutting edge 36 has a rectangular inclined surface. Further, in the blade 34, a ridgeline 46 is formed at the boundary between the front blades 36 adjacent in the width direction X. As shown in FIG. The ridge line 46 extends in the extending direction Y from the cutting edge 40 and has a base point 48 at the end opposite to the cutting edge 40 . The blade base 42 is located on the same line in the width direction X as the base point 48 or on the cutting edge 40 side of the base point 48 in the extension direction Y. As shown in FIG. The ridgeline 46 extends in the extension direction Y from a base point 48 on the surface of the blade 34 to the cutting edge 40 . A first valley line 50 is formed at the boundary between blades 34 adjacent to each other in the width direction X on the surface of the blade 34 .

FIG. 4 shows an enlarged view of the back blade 38. As shown in FIG. The back blade 38 is formed on the back surface of the blade 34 opposite to the front blade 36 and has the same cutting blade 40 , base 42 and edge 44 as the front blade 36 . Specifically, the back blade 38 has a triangular inclined surface. In addition, a second valley line 52 is formed at the boundary between the back blades 38 adjacent to each other in the width direction X in the blade 34 . In addition, on the back surface of the blade 34, the boundary between the blades 34 adjacent in the width direction X forms a triangular vertex of the back blade 38, and the blade root 42 is positioned at the vertex.

5 to 7 respectively show a cross-sectional view along line AA, a cross-sectional view along line BB, and a cross-sectional view along line CC in FIG. FIG. 5 shows a cross-section along the edge line 46 of the blade 34. As shown in FIG. FIG. 6 shows a cross section at an angle with respect to the extending direction Y at a portion where both the front cutting edge 36 and the back cutting edge 38 of the blade 34 are present. FIG. 7 shows a cross section of blade 34 along first valley line 50 .

As is clear from FIGS. 5 to 7, the front blade 36 is inclined in the direction of decreasing the thickness t1 of the blade 34 in the blade thickness direction Z. As shown in FIG. On the other hand, as is clear from FIGS. 5 and 6, the back blade 38 is formed so as to gouge the back side of the front blade 36 due to the presence of the second valley line 52, and has a thickness t2 in the blade thickness direction Z of the front blade 36. is inclined in the direction of decreasing

8 shows, as seen from the extending direction Y of each blade 34 (specifically three), (a): front view of each blade 34, (b) to (e): each blade 34 4A and 4B are stepwise cross-sectional views in a direction approaching the blade base 42, respectively. By reducing the thickness t2 of the front blade 36 along with the formation of the back blade 38, the area of the cross section S in the blade thickness direction Z from the cutting edge 40 of the blade 34 to the blade base 42 is the same as the conventional rhombic cross section S is greatly reduced compared to the case of Specifically, the cross section S forms a concave quadrangle in any cross section of FIGS. 8(a) to (e).

FIG. 9 shows (a) each cut edge 54 of the tubular packaging material Wc when each blade 34 thrusts the tubular packaging material Wc in the process of cutting the tubular packaging material Wc with the knife 22, and (b) (c) the cut end 54 of the tubular packaging material Wc when each blade 34 cuts the tubular packaging material Wc. 4 shows a captured image. By pushing the tubular packaging material Wc with each of the blades 34, concave rectangular cut edges 54 are formed in the tubular packaging material Wc in the width direction X as shown in FIG. 9(a).

As the pushing of each blade 34 progresses, as shown in FIG. 9B, the cut edge 54 of the cylindrical packaging material Wc gradually increases in size while forming a shape similar to a concave rectangular shape. Then, as shown in FIG. 9(c), the cutting edges 54 adjacent to each other in the width direction X are connected with each other by further advancing the thrusting of the blades 34, thereby cutting the cylindrical packaging material Wc.

That is, while the cutting edge 34 of the knife 22 pushes a portion corresponding to the area of the cut end 54 of the tubular packaging material Wc (pushing process), the tubular packaging material Wc is cut by the blade edges 44 of the knife 22 to cut into a tubular shape. The cut edge 54 of the shaped packaging material Wc is gradually enlarged (cutting process). The lower portion of the incision 54 shown in FIG. 9 has a shape corresponding to the concave portion of each blade 34 having a concave rectangular cross section. Therefore, when each blade 34 pushes the tubular packaging material Wc in the push-pushing process, each blade 34 cuts the tubular packaging material Wc without pushing the packaging material W in the lower portion of the cut edge 54 so much. .

FIG. 10 shows a front view of the bag P in which the cut end 54 of the lateral seal portion Sh cut by the knife 22 is clarified. The cut edges 54 of the tubular packaging material Wc at the laterally sealed portion Sh are formed at the upper and lower ends of the bag P. As shown in FIG. The incision 54 forms a ridge-and-valley wave shape along the outer edge of the concave quadrangular cross-section of each blade 34 . Both peaks and valleys of this corrugated shape are smooth, and as is clear from FIG.

On the other hand, FIG. 11 shows fluff 56 of fibers at the cut end 54 of the cylindrical packaging material Wc, which has occurred in the prior art. In the cut edge 54 of the conventional tubular packaging material Wc, fluff 56 of the fibers of the tubular packaging material Wc are generated at the peaks of the corrugated crests and at the corners of the corrugated valleys. This is because the wrapping material W is more difficult to stretch than the film wrapping material, so in the conventional case where the blade 34 has a diamond-shaped cross section S, the stretching of the cylindrical wrapping material Wc is insufficient in the pushing process. This is due to the fact that the cylindrical packaging material Wc was pushed and shredded.

Specifically, as the thrusting process of the knife 22 progresses, the portion (upper end of the bag P) forming the cut edge 54 of the cylindrical packaging material Wc shown in FIG. is pulled downward by the blade 34. The tubular packaging material Wc formed from the hard-to-stretch packaging material W exceeds the limit of the tensile strength of the packaging material W before the cutting is completed, and is pulled by the blade 34. The cut edge 54 is fuzzy 56 .

Such fluff 56 prevents the formation of a smooth cut edge 54, and when it comes into contact with the fluff 56, other objects may be caught on it, and when the fluff 56 comes off, paper dust may be generated. reduce quality.

As described above, in the knife 22 for cutting packaging materials of the embodiment, the thickness t2 of the front blade 36 is reduced along with the formation of the back blade 38. When viewed from above, the slanted surfaces are slanted in the same direction, and are formed asymmetrically on the front and back surfaces with different cutting angles. As a result, the area of the cross section S in the blade thickness direction Z extending from the cutting edge 40 of the blade 34 to the blade base 42 is reduced.

Since the area of the cross section S of the blades 34 is reduced, each blade 34 cuts the tubular packaging material Wc without pressing the packaging material W at the lower portion of the cut edge 54 so much. That is, since the area of the cut end 54 of the cylindrical packaging material Wc is smaller than in the conventional case, it is possible to reduce the specific gravity of the pushing process described above. Therefore, when cutting the tubular packaging material Wc with the knife 22, the specific gravity of the above-described tearing process becomes relatively large, and a smooth cut edge 54 can be formed in the tubular packaging material Wc.

Specifically, the cross section S in the blade thickness direction Z from the cutting edge 40 to the blade base 42 of the blade 34 is a concave quadrangle. As a result, the cut edge 54 of the tubular packaging material Wc can be formed into a crest-and-valley wave pattern without fluff 56 along the outer edge of the concave square cross-section of each blade 34 . The base 42 of the blade 42 is located on the same line in the width direction X as the base point 48 of the ridge line 46 , or on the cutting edge 40 side of the base point 48 in the extension direction Y.

As a result, in the process of cutting the tubular packaging material Wc with the knife 22, when the blade base 42 of the blade 34 reaches the tubular packaging material Wc, the ridgeline 46 is aligned with the ridge of the cut end 54 of the tubular packaging material Wc. Securely positioned on top. Therefore, as shown in FIG. 9(c), by connecting the cut edges 54, the cross section S can be maintained in a concave square shape until the tubular packaging material Wc is cut. Therefore, it is possible to more reliably form the smooth cut edge 54 in the cylindrical packaging material Wc.

Moreover, it is preferable that the interval D between the blades 34 arranged side by side in the width direction X of the blade portion 32 is 5 mm. By arranging the cutting blades 34 side by side with a shorter interval D than in the prior art, it is possible to more effectively prevent the fluffing 56 of the cut edge 54 .

Although the description of the embodiments is finished above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the knife 22 can cut difficult-to-stretch packaging materials other than paper packaging materials, and can be used to cut all packaging materials W in shapes other than cylindrical packaging materials Wc. Further, if the knife 22 is used for cutting the packaging material W, the knife 22 may be used for a packaging type packaging machine other than the vertical form-fill-seal packaging machine 1 shown in the embodiment.

The knife 22 can also be used for cutting the packaging material W in devices other than packaging machines. Also, the cross section S of the blade 34 is not limited to a concave square. Specifically, the thickness t2 of the blade 36 should be reduced as the back blade 38 is formed. In other words, the front cutting edge 36 and the back cutting edge 38 may be inclined in the same direction when viewed from the thickness center of the cutting edge 34, and formed asymmetrically with different cutting angles.

As long as these conditions are satisfied, the cross section S of the blade 34 can be changed into various shapes according to the required shape of the cut edge 54 of the packaging material W. For example, the cross section S in the blade thickness direction Z from the cutting edge 40 to the blade base 42 of the blade 34 may have a shape with arcuate corners instead of a concave square with acute corners.

Further, the cross section S may be formed in a triangular shape with the blade base 42 positioned on the same line in the width direction X as the base point 48 of the ridgeline 46 or on the cutting edge 40 side of the base point 48 in the extension direction Y. . As a result, the area of the cross section S is reduced as compared with at least the case where the cross section S of the blade 34 has a rhombic shape. Furthermore, since the cross section S can be maintained in a triangular shape until the tubular packaging material Wc is cut by connecting the respective cut edges 54, the tubular packaging material Wc can be formed with smooth cut edges 54. FIG.

1 vertical bag-making, filling and packaging machine 2 bag-making tube 22 knife 24 blade receiving groove 26 body 32 blade portion 34 blade 36 front blade 38 back blade 40 cutting blade 42 blade base 44 blade edge 46 ridge line 48 base point D interval P bag S cross section Sh Horizontal seal portion t2 Thickness W Packaging material Wc Cylindrical packaging material X Width direction Y Extension direction Z Blade thickness direction

Claims (7)

A knife for cutting packaging materials that pushes and cuts a difficult-to-stretch packaging material,
a plate-shaped main body;
a blade portion formed on the main body;
A blade that is arranged side by side at a predetermined interval in the width direction of the blade and has a V shape in plan view,
The blade is
a cutting edge forming the V-shaped tip of the blade;
A blade root located on both sides of the cutting edge in the width direction and forming the V-shaped valley of the blade,
A cutting edge that connects the cutting edge and the blade base and forms two sides of the V-shaped blade,
A front blade formed on the surface of the blade and extending along the blade edge from the cutting blade toward the blade base;
A back blade formed on the back surface of the blade and having the same cutting edge as the front blade, the blade base, and the cutting edge,
The back blade is a knife for cutting packaging material, wherein the back blade is inclined in the direction of decreasing the thickness in the blade thickness direction of the front blade. 2. The packaging material cutting tool according to claim 1, wherein said front and back blades are inclined in the same direction when viewed from the thickness center of said blade, and are asymmetrically formed with different cutting angles. knife. 3. The knife for cutting packaging materials according to claim 2, wherein a cross section in the blade thickness direction from the cutting edge of the blade to the base of the blade forms a concave square. A ridgeline formed at the boundary between the front blades adjacent in the width direction in the blade and extending from the cutting edge in the extending direction of the blade;
and a base point that is the end of the ridge line opposite to the cutting edge, and the blade base is on the same line in the width direction as the base point, or on the cutting edge side of the base point in the extending direction. A knife for cutting packaging material according to any one of claims 1 to 3, located. The knife for cutting packaging material according to any one of claims 1 to 4, wherein the interval between the blades arranged side by side in the width direction of the blade portion is 5 mm. The knife for cutting packaging material according to any one of claims 1 to 5, wherein the front blade has a rectangular inclined surface, and the back blade has a triangular inclined surface. A vertical bag-making, filling and packaging machine comprising the knife for cutting packaging material according to any one of claims 1 to 6,
The packaging material is formed into a tubular shape around the bag-making tube, and the tubular packaging material is pushed out below the bag-making tube while the formed tubular packaging material is fed out in the longitudinal direction of the bag-making tube. While forming the lateral seal portions at predetermined intervals in the longitudinal direction of the material, the formation of the lateral seal portions and the filling of the interior of the cylindrical packaging material are alternately performed, and at the same time, the knife is used to form the lateral seal portions. A vertical form-fill-seal-packaging machine that cuts the cylindrical packaging material at the horizontal sealing section to manufacture a bag filled with the filling material.

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